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+/**
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+ * Copyright (C) 2013 Jorge Jimenez ([email protected])
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+ * Copyright (C) 2013 Jose I. Echevarria ([email protected])
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+ * Copyright (C) 2013 Belen Masia ([email protected])
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+ * Copyright (C) 2013 Fernando Navarro ([email protected])
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+ * Copyright (C) 2013 Diego Gutierrez ([email protected])
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * this software and associated documentation files (the "Software"), to deal in
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+ * the Software without restriction, including without limitation the rights to
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+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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+ * of the Software, and to permit persons to whom the Software is furnished to
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+ * do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software. As clarification, there
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+ * is no requirement that the copyright notice and permission be included in
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+ * binary distributions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+ * SOFTWARE.
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+ */
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+
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+
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+/**
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+ * _______ ___ ___ ___ ___
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+ * / || \/ | / \ / \
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+ * | (---- | \ / | / ^ \ / ^ \
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+ * \ \ | |\/| | / /_\ \ / /_\ \
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+ * ----) | | | | | / _____ \ / _____ \
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+ * |_______/ |__| |__| /__/ \__\ /__/ \__\
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+ *
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+ * E N H A N C E D
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+ * S U B P I X E L M O R P H O L O G I C A L A N T I A L I A S I N G
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+ *
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+ * http://www.iryoku.com/smaa/
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+ *
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+ * Hi, welcome aboard!
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+ *
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+ * Here you'll find instructions to get the shader up and running as fast as
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+ * possible.
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+ *
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+ * IMPORTANTE NOTICE: when updating, remember to update both this file and the
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+ * precomputed textures! They may change from version to version.
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+ *
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+ * The shader has three passes, chained together as follows:
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+ *
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+ * |input|------------------·
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+ * v |
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+ * [ SMAA*EdgeDetection ] |
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+ * v |
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+ * |edgesTex| |
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+ * v |
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+ * [ SMAABlendingWeightCalculation ] |
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+ * v |
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+ * |blendTex| |
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+ * v |
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+ * [ SMAANeighborhoodBlending ] <------·
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+ * v
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+ * |output|
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+ *
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+ * Note that each [pass] has its own vertex and pixel shader. Remember to use
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+ * oversized triangles instead of quads to avoid overshading along the
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+ * diagonal.
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+ *
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+ * You've three edge detection methods to choose from: luma, color or depth.
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+ * They represent different quality/performance and anti-aliasing/sharpness
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+ * tradeoffs, so our recommendation is for you to choose the one that best
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+ * suits your particular scenario:
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+ *
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+ * - Depth edge detection is usually the fastest but it may miss some edges.
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+ *
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+ * - Luma edge detection is usually more expensive than depth edge detection,
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+ * but catches visible edges that depth edge detection can miss.
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+ *
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+ * - Color edge detection is usually the most expensive one but catches
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+ * chroma-only edges.
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+ *
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+ * For quickstarters: just use luma edge detection.
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+ *
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+ * The general advice is to not rush the integration process and ensure each
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+ * step is done correctly (don't try to integrate SMAA T2x with predicated edge
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+ * detection from the start!). Ok then, let's go!
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+ *
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+ * 1. The first step is to create two RGBA temporal render targets for holding
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+ * |edgesTex| and |blendTex|.
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+ *
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+ * In DX10 or DX11, you can use a RG render target for the edges texture.
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+ * In the case of NVIDIA GPUs, using RG render targets seems to actually be
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+ * slower.
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+ *
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+ * On the Xbox 360, you can use the same render target for resolving both
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+ * |edgesTex| and |blendTex|, as they aren't needed simultaneously.
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+ *
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+ * 2. Both temporal render targets |edgesTex| and |blendTex| must be cleared
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+ * each frame. Do not forget to clear the alpha channel!
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+ *
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+ * 3. The next step is loading the two supporting precalculated textures,
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+ * 'areaTex' and 'searchTex'. You'll find them in the 'Textures' folder as
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+ * C++ headers, and also as regular DDS files. They'll be needed for the
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+ * 'SMAABlendingWeightCalculation' pass.
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+ *
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+ * If you use the C++ headers, be sure to load them in the format specified
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+ * inside of them.
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+ *
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+ * You can also compress 'areaTex' and 'searchTex' using BC5 and BC4
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+ * respectively, if you have that option in your content processor pipeline.
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+ * When compressing then, you get a non-perceptible quality decrease, and a
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+ * marginal performance increase.
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+ *
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+ * 4. All samplers must be set to linear filtering and clamp.
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+ *
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+ * After you get the technique working, remember that 64-bit inputs have
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+ * half-rate linear filtering on GCN.
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+ *
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+ * If SMAA is applied to 64-bit color buffers, switching to point filtering
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+ * when accesing them will increase the performance. Search for
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+ * 'SMAASamplePoint' to see which textures may benefit from point
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+ * filtering, and where (which is basically the color input in the edge
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+ * detection and resolve passes).
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+ *
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+ * 5. All texture reads and buffer writes must be non-sRGB, with the exception
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+ * of the input read and the output write in
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+ * 'SMAANeighborhoodBlending' (and only in this pass!). If sRGB reads in
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+ * this last pass are not possible, the technique will work anyway, but
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+ * will perform antialiasing in gamma space.
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+ *
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+ * IMPORTANT: for best results the input read for the color/luma edge
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+ * detection should *NOT* be sRGB.
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+ *
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+ * 6. Before including SMAA.h you'll have to setup the render target metrics,
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+ * the target and any optional configuration defines. Optionally you can
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+ * use a preset.
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+ *
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+ * You have the following targets available:
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+ * SMAA_HLSL_3
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+ * SMAA_HLSL_4
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+ * SMAA_HLSL_4_1
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+ * SMAA_GLSL_3 *
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+ * SMAA_GLSL_4 *
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+ *
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+ * * (See SMAA_INCLUDE_VS and SMAA_INCLUDE_PS below).
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+ *
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+ * And four presets:
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+ * SMAA_PRESET_LOW (%60 of the quality)
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+ * SMAA_PRESET_MEDIUM (%80 of the quality)
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+ * SMAA_PRESET_HIGH (%95 of the quality)
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+ * SMAA_PRESET_ULTRA (%99 of the quality)
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+ *
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+ * For example:
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+ * #define SMAA_RT_METRICS float4(1.0 / 1280.0, 1.0 / 720.0, 1280.0, 720.0)
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+ * #define SMAA_HLSL_4
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+ * #define SMAA_PRESET_HIGH
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+ * #include "SMAA.h"
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+ *
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+ * Note that SMAA_RT_METRICS doesn't need to be a macro, it can be a
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+ * uniform variable. The code is designed to minimize the impact of not
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+ * using a constant value, but it is still better to hardcode it.
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+ *
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+ * Depending on how you encoded 'areaTex' and 'searchTex', you may have to
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+ * add (and customize) the following defines before including SMAA.h:
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+ * #define SMAA_AREATEX_SELECT(sample) sample.rg
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+ * #define SMAA_SEARCHTEX_SELECT(sample) sample.r
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+ *
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+ * If your engine is already using porting macros, you can define
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+ * SMAA_CUSTOM_SL, and define the porting functions by yourself.
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+ *
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+ * 7. Then, you'll have to setup the passes as indicated in the scheme above.
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+ * You can take a look into SMAA.fx, to see how we did it for our demo.
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+ * Checkout the function wrappers, you may want to copy-paste them!
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+ *
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+ * 8. It's recommended to validate the produced |edgesTex| and |blendTex|.
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+ * You can use a screenshot from your engine to compare the |edgesTex|
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+ * and |blendTex| produced inside of the engine with the results obtained
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+ * with the reference demo.
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+ *
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+ * 9. After you get the last pass to work, it's time to optimize. You'll have
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+ * to initialize a stencil buffer in the first pass (discard is already in
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+ * the code), then mask execution by using it the second pass. The last
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+ * pass should be executed in all pixels.
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+ *
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+ *
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+ * After this point you can choose to enable predicated thresholding,
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+ * temporal supersampling and motion blur integration:
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+ *
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+ * a) If you want to use predicated thresholding, take a look into
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+ * SMAA_PREDICATION; you'll need to pass an extra texture in the edge
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+ * detection pass.
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+ *
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+ * b) If you want to enable temporal supersampling (SMAA T2x):
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+ *
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+ * 1. The first step is to render using subpixel jitters. I won't go into
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+ * detail, but it's as simple as moving each vertex position in the
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+ * vertex shader, you can check how we do it in our DX10 demo.
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+ *
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+ * 2. Then, you must setup the temporal resolve. You may want to take a look
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+ * into SMAAResolve for resolving 2x modes. After you get it working, you'll
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+ * probably see ghosting everywhere. But fear not, you can enable the
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+ * CryENGINE temporal reprojection by setting the SMAA_REPROJECTION macro.
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+ * Check out SMAA_DECODE_VELOCITY if your velocity buffer is encoded.
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+ *
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+ * 3. The next step is to apply SMAA to each subpixel jittered frame, just as
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+ * done for 1x.
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+ *
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+ * 4. At this point you should already have something usable, but for best
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+ * results the proper area textures must be set depending on current jitter.
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+ * For this, the parameter 'subsampleIndices' of
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+ * 'SMAABlendingWeightCalculationPS' must be set as follows, for our T2x
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+ * mode:
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+ *
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+ * @SUBSAMPLE_INDICES
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+ *
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+ * | S# | Camera Jitter | subsampleIndices |
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+ * +----+------------------+---------------------+
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+ * | 0 | ( 0.25, -0.25) | float4(1, 1, 1, 0) |
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+ * | 1 | (-0.25, 0.25) | float4(2, 2, 2, 0) |
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+ *
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+ * These jitter positions assume a bottom-to-top y axis. S# stands for the
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+ * sample number.
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+ *
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+ * More information about temporal supersampling here:
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+ * http://iryoku.com/aacourse/downloads/13-Anti-Aliasing-Methods-in-CryENGINE-3.pdf
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+ *
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+ * c) If you want to enable spatial multisampling (SMAA S2x):
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+ *
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+ * 1. The scene must be rendered using MSAA 2x. The MSAA 2x buffer must be
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+ * created with:
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+ * - DX10: see below (*)
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+ * - DX10.1: D3D10_STANDARD_MULTISAMPLE_PATTERN or
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+ * - DX11: D3D11_STANDARD_MULTISAMPLE_PATTERN
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+ *
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+ * This allows to ensure that the subsample order matches the table in
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+ * @SUBSAMPLE_INDICES.
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+ *
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+ * (*) In the case of DX10, we refer the reader to:
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+ * - SMAA::detectMSAAOrder and
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+ * - SMAA::msaaReorder
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+ *
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+ * These functions allow to match the standard multisample patterns by
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+ * detecting the subsample order for a specific GPU, and reordering
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+ * them appropriately.
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+ *
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+ * 2. A shader must be run to output each subsample into a separate buffer
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+ * (DX10 is required). You can use SMAASeparate for this purpose, or just do
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+ * it in an existing pass (for example, in the tone mapping pass, which has
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+ * the advantage of feeding tone mapped subsamples to SMAA, which will yield
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+ * better results).
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+ *
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+ * 3. The full SMAA 1x pipeline must be run for each separated buffer, storing
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+ * the results in the final buffer. The second run should alpha blend with
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+ * the existing final buffer using a blending factor of 0.5.
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+ * 'subsampleIndices' must be adjusted as in the SMAA T2x case (see point
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+ * b).
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+ *
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+ * d) If you want to enable temporal supersampling on top of SMAA S2x
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+ * (which actually is SMAA 4x):
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+ *
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+ * 1. SMAA 4x consists on temporally jittering SMAA S2x, so the first step is
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+ * to calculate SMAA S2x for current frame. In this case, 'subsampleIndices'
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+ * must be set as follows:
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+ *
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+ * | F# | S# | Camera Jitter | Net Jitter | subsampleIndices |
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+ * +----+----+--------------------+-------------------+----------------------+
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+ * | 0 | 0 | ( 0.125, 0.125) | ( 0.375, -0.125) | float4(5, 3, 1, 3) |
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+ * | 0 | 1 | ( 0.125, 0.125) | (-0.125, 0.375) | float4(4, 6, 2, 3) |
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+ * +----+----+--------------------+-------------------+----------------------+
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+ * | 1 | 2 | (-0.125, -0.125) | ( 0.125, -0.375) | float4(3, 5, 1, 4) |
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+ * | 1 | 3 | (-0.125, -0.125) | (-0.375, 0.125) | float4(6, 4, 2, 4) |
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+ *
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+ * These jitter positions assume a bottom-to-top y axis. F# stands for the
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+ * frame number. S# stands for the sample number.
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+ *
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+ * 2. After calculating SMAA S2x for current frame (with the new subsample
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+ * indices), previous frame must be reprojected as in SMAA T2x mode (see
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+ * point b).
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+ *
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+ * e) If motion blur is used, you may want to do the edge detection pass
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+ * together with motion blur. This has two advantages:
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+ *
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+ * 1. Pixels under heavy motion can be omitted from the edge detection process.
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+ * For these pixels we can just store "no edge", as motion blur will take
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+ * care of them.
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+ * 2. The center pixel tap is reused.
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+ *
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+ * Note that in this case depth testing should be used instead of stenciling,
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+ * as we have to write all the pixels in the motion blur pass.
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+ *
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+ * That's it!
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+ */
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+
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+//-----------------------------------------------------------------------------
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+// SMAA Presets
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+
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+/**
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+ * Note that if you use one of these presets, the following configuration
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+ * macros will be ignored if set in the "Configurable Defines" section.
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+ */
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+
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+#if defined(SMAA_PRESET_LOW)
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+#define SMAA_THRESHOLD 0.15
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+#define SMAA_MAX_SEARCH_STEPS 4
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+#define SMAA_DISABLE_DIAG_DETECTION
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+#define SMAA_DISABLE_CORNER_DETECTION
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+#elif defined(SMAA_PRESET_MEDIUM)
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+#define SMAA_THRESHOLD 0.1
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+#define SMAA_MAX_SEARCH_STEPS 8
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+#define SMAA_DISABLE_DIAG_DETECTION
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+#define SMAA_DISABLE_CORNER_DETECTION
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+#elif defined(SMAA_PRESET_HIGH)
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+#define SMAA_THRESHOLD 0.1
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+#define SMAA_MAX_SEARCH_STEPS 16
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+#define SMAA_MAX_SEARCH_STEPS_DIAG 8
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+#define SMAA_CORNER_ROUNDING 25
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+
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+#define SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR 2.0
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+#define SMAA_PREDICATION_THRESHOLD 0.01
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+#define SMAA_PREDICATION_SCALE 2.0
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+#define SMAA_PREDICATION_STRENGTH 0.4
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+
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+#elif defined(SMAA_PRESET_ULTRA)
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+#define SMAA_THRESHOLD 0.05
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+#define SMAA_MAX_SEARCH_STEPS 32
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+#define SMAA_MAX_SEARCH_STEPS_DIAG 16
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+#define SMAA_CORNER_ROUNDING 25
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+
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+#define SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR 2.0
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+#define SMAA_PREDICATION_THRESHOLD 0.01
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+#define SMAA_PREDICATION_SCALE 2.0
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+#define SMAA_PREDICATION_STRENGTH 0.4
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+
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+#endif
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+
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+//-----------------------------------------------------------------------------
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+// Configurable Defines
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+
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+/**
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+ * SMAA_THRESHOLD specifies the threshold or sensitivity to edges.
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+ * Lowering this value you will be able to detect more edges at the expense of
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+ * performance.
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+ *
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+ * Range: [0, 0.5]
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+ * 0.1 is a reasonable value, and allows to catch most visible edges.
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+ * 0.05 is a rather overkill value, that allows to catch 'em all.
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+ *
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+ * If temporal supersampling is used, 0.2 could be a reasonable value, as low
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+ * contrast edges are properly filtered by just 2x.
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+ */
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+#ifndef SMAA_THRESHOLD
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+#define SMAA_THRESHOLD 0.1
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+#endif
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+
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+/**
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+ * SMAA_DEPTH_THRESHOLD specifies the threshold for depth edge detection.
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+ *
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|
|
+ * Range: depends on the depth range of the scene.
|
|
|
+ */
|
|
|
+#ifndef SMAA_DEPTH_THRESHOLD
|
|
|
+#define SMAA_DEPTH_THRESHOLD (0.1 * SMAA_THRESHOLD)
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * SMAA_MAX_SEARCH_STEPS specifies the maximum steps performed in the
|
|
|
+ * horizontal/vertical pattern searches, at each side of the pixel.
|
|
|
+ *
|
|
|
+ * In number of pixels, it's actually the double. So the maximum line length
|
|
|
+ * perfectly handled by, for example 16, is 64 (by perfectly, we meant that
|
|
|
+ * longer lines won't look as good, but still antialiased).
|
|
|
+ *
|
|
|
+ * Range: [0, 112]
|
|
|
+ */
|
|
|
+#ifndef SMAA_MAX_SEARCH_STEPS
|
|
|
+#define SMAA_MAX_SEARCH_STEPS 16
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * SMAA_MAX_SEARCH_STEPS_DIAG specifies the maximum steps performed in the
|
|
|
+ * diagonal pattern searches, at each side of the pixel. In this case we jump
|
|
|
+ * one pixel at time, instead of two.
|
|
|
+ *
|
|
|
+ * Range: [0, 20]
|
|
|
+ *
|
|
|
+ * On high-end machines it is cheap (between a 0.8x and 0.9x slower for 16
|
|
|
+ * steps), but it can have a significant impact on older machines.
|
|
|
+ *
|
|
|
+ * Define SMAA_DISABLE_DIAG_DETECTION to disable diagonal processing.
|
|
|
+ */
|
|
|
+#ifndef SMAA_MAX_SEARCH_STEPS_DIAG
|
|
|
+#define SMAA_MAX_SEARCH_STEPS_DIAG 8
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * SMAA_CORNER_ROUNDING specifies how much sharp corners will be rounded.
|
|
|
+ *
|
|
|
+ * Range: [0, 100]
|
|
|
+ *
|
|
|
+ * Define SMAA_DISABLE_CORNER_DETECTION to disable corner processing.
|
|
|
+ */
|
|
|
+#ifndef SMAA_CORNER_ROUNDING
|
|
|
+#define SMAA_CORNER_ROUNDING 25
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * If there is an neighbor edge that has SMAA_LOCAL_CONTRAST_FACTOR times
|
|
|
+ * bigger contrast than current edge, current edge will be discarded.
|
|
|
+ *
|
|
|
+ * This allows to eliminate spurious crossing edges, and is based on the fact
|
|
|
+ * that, if there is too much contrast in a direction, that will hide
|
|
|
+ * perceptually contrast in the other neighbors.
|
|
|
+ */
|
|
|
+#ifndef SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR
|
|
|
+#define SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR 2.0
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * Predicated thresholding allows to better preserve texture details and to
|
|
|
+ * improve performance, by decreasing the number of detected edges using an
|
|
|
+ * additional buffer like the light accumulation buffer, object ids or even the
|
|
|
+ * depth buffer (the depth buffer usage may be limited to indoor or short range
|
|
|
+ * scenes).
|
|
|
+ *
|
|
|
+ * It locally decreases the luma or color threshold if an edge is found in an
|
|
|
+ * additional buffer (so the global threshold can be higher).
|
|
|
+ *
|
|
|
+ * This method was developed by Playstation EDGE MLAA team, and used in
|
|
|
+ * Killzone 3, by using the light accumulation buffer. More information here:
|
|
|
+ * http://iryoku.com/aacourse/downloads/06-MLAA-on-PS3.pptx
|
|
|
+ */
|
|
|
+#ifndef SMAA_PREDICATION
|
|
|
+#define SMAA_PREDICATION 0
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * Threshold to be used in the additional predication buffer.
|
|
|
+ *
|
|
|
+ * Range: depends on the input, so you'll have to find the magic number that
|
|
|
+ * works for you.
|
|
|
+ */
|
|
|
+#ifndef SMAA_PREDICATION_THRESHOLD
|
|
|
+#define SMAA_PREDICATION_THRESHOLD 0.01
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * How much to scale the global threshold used for luma or color edge
|
|
|
+ * detection when using predication.
|
|
|
+ *
|
|
|
+ * Range: [1, 5]
|
|
|
+ */
|
|
|
+#ifndef SMAA_PREDICATION_SCALE
|
|
|
+#define SMAA_PREDICATION_SCALE 2.0
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * How much to locally decrease the threshold.
|
|
|
+ *
|
|
|
+ * Range: [0, 1]
|
|
|
+ */
|
|
|
+#ifndef SMAA_PREDICATION_STRENGTH
|
|
|
+#define SMAA_PREDICATION_STRENGTH 0.4
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * Temporal reprojection allows to remove ghosting artifacts when using
|
|
|
+ * temporal supersampling. We use the CryEngine 3 method which also introduces
|
|
|
+ * velocity weighting. This feature is of extreme importance for totally
|
|
|
+ * removing ghosting. More information here:
|
|
|
+ * http://iryoku.com/aacourse/downloads/13-Anti-Aliasing-Methods-in-CryENGINE-3.pdf
|
|
|
+ *
|
|
|
+ * Note that you'll need to setup a velocity buffer for enabling reprojection.
|
|
|
+ * For static geometry, saving the previous depth buffer is a viable
|
|
|
+ * alternative.
|
|
|
+ */
|
|
|
+#ifndef SMAA_REPROJECTION
|
|
|
+#define SMAA_REPROJECTION 0
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * SMAA_REPROJECTION_WEIGHT_SCALE controls the velocity weighting. It allows to
|
|
|
+ * remove ghosting trails behind the moving object, which are not removed by
|
|
|
+ * just using reprojection. Using low values will exhibit ghosting, while using
|
|
|
+ * high values will disable temporal supersampling under motion.
|
|
|
+ *
|
|
|
+ * Behind the scenes, velocity weighting removes temporal supersampling when
|
|
|
+ * the velocity of the subsamples differs (meaning they are different objects).
|
|
|
+ *
|
|
|
+ * Range: [0, 80]
|
|
|
+ */
|
|
|
+#ifndef SMAA_REPROJECTION_WEIGHT_SCALE
|
|
|
+#define SMAA_REPROJECTION_WEIGHT_SCALE 30.0
|
|
|
+#endif
|
|
|
+
|
|
|
+/**
|
|
|
+ * On some compilers, discard cannot be used in vertex shaders. Thus, they need
|
|
|
+ * to be compiled separately.
|
|
|
+ */
|
|
|
+#ifndef SMAA_INCLUDE_VS
|
|
|
+#define SMAA_INCLUDE_VS 1
|
|
|
+#endif
|
|
|
+#ifndef SMAA_INCLUDE_PS
|
|
|
+#define SMAA_INCLUDE_PS 1
|
|
|
+#endif
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Texture Access Defines
|
|
|
+
|
|
|
+#ifndef SMAA_AREATEX_SELECT
|
|
|
+#if defined(SMAA_HLSL_3)
|
|
|
+#define SMAA_AREATEX_SELECT(sample) sample.ra
|
|
|
+#else
|
|
|
+#define SMAA_AREATEX_SELECT(sample) sample.rg
|
|
|
+#endif
|
|
|
+#endif
|
|
|
+
|
|
|
+#ifndef SMAA_SEARCHTEX_SELECT
|
|
|
+#define SMAA_SEARCHTEX_SELECT(sample) sample.r
|
|
|
+#endif
|
|
|
+
|
|
|
+#ifndef SMAA_DECODE_VELOCITY
|
|
|
+#define SMAA_DECODE_VELOCITY(sample) sample.rg
|
|
|
+#endif
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Non-Configurable Defines
|
|
|
+
|
|
|
+#define SMAA_AREATEX_MAX_DISTANCE 16
|
|
|
+#define SMAA_AREATEX_MAX_DISTANCE_DIAG 20
|
|
|
+#define SMAA_AREATEX_PIXEL_SIZE (1.0 / float2(160.0, 560.0))
|
|
|
+#define SMAA_AREATEX_SUBTEX_SIZE (1.0 / 7.0)
|
|
|
+#define SMAA_SEARCHTEX_SIZE float2(66.0, 33.0)
|
|
|
+#define SMAA_SEARCHTEX_PACKED_SIZE float2(64.0, 16.0)
|
|
|
+#define SMAA_CORNER_ROUNDING_NORM (float(SMAA_CORNER_ROUNDING) / 100.0)
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Porting Functions
|
|
|
+
|
|
|
+#if defined(SMAA_HLSL_3)
|
|
|
+#define SMAATexture2D(tex) sampler2D tex
|
|
|
+#define SMAATexturePass2D(tex) tex
|
|
|
+#define SMAASampleLevelZero(tex, coord) tex2Dlod(tex, float4(coord, 0.0, 0.0))
|
|
|
+#define SMAASampleLevelZeroPoint(tex, coord) tex2Dlod(tex, float4(coord, 0.0, 0.0))
|
|
|
+#define SMAASampleLevelZeroOffset(tex, coord, offset) tex2Dlod(tex, float4(coord + offset * SMAA_RT_METRICS.xy, 0.0, 0.0))
|
|
|
+#define SMAASample(tex, coord) tex2D(tex, coord)
|
|
|
+#define SMAASamplePoint(tex, coord) tex2D(tex, coord)
|
|
|
+#define SMAASampleOffset(tex, coord, offset) tex2D(tex, coord + offset * SMAA_RT_METRICS.xy)
|
|
|
+#define SMAA_FLATTEN [flatten]
|
|
|
+#define SMAA_BRANCH [branch]
|
|
|
+#endif
|
|
|
+#if defined(SMAA_HLSL_4) || defined(SMAA_HLSL_4_1)
|
|
|
+SamplerState LinearSampler { Filter = MIN_MAG_LINEAR_MIP_POINT; AddressU = Clamp; AddressV = Clamp; };
|
|
|
+SamplerState PointSampler { Filter = MIN_MAG_MIP_POINT; AddressU = Clamp; AddressV = Clamp; };
|
|
|
+#define SMAATexture2D(tex) Texture2D tex
|
|
|
+#define SMAATexturePass2D(tex) tex
|
|
|
+#define SMAASampleLevelZero(tex, coord) tex.SampleLevel(LinearSampler, coord, 0)
|
|
|
+#define SMAASampleLevelZeroPoint(tex, coord) tex.SampleLevel(PointSampler, coord, 0)
|
|
|
+#define SMAASampleLevelZeroOffset(tex, coord, offset) tex.SampleLevel(LinearSampler, coord, 0, offset)
|
|
|
+#define SMAASample(tex, coord) tex.Sample(LinearSampler, coord)
|
|
|
+#define SMAASamplePoint(tex, coord) tex.Sample(PointSampler, coord)
|
|
|
+#define SMAASampleOffset(tex, coord, offset) tex.Sample(LinearSampler, coord, offset)
|
|
|
+#define SMAA_FLATTEN [flatten]
|
|
|
+#define SMAA_BRANCH [branch]
|
|
|
+#define SMAATexture2DMS2(tex) Texture2DMS<float4, 2> tex
|
|
|
+#define SMAALoad(tex, pos, sample) tex.Load(pos, sample)
|
|
|
+#if defined(SMAA_HLSL_4_1)
|
|
|
+#define SMAAGather(tex, coord) tex.Gather(LinearSampler, coord, 0)
|
|
|
+#endif
|
|
|
+#endif
|
|
|
+#if defined(SMAA_GLSL_3) || defined(SMAA_GLSL_4)
|
|
|
+#define SMAATexture2D(tex) sampler2D tex
|
|
|
+#define SMAATexturePass2D(tex) tex
|
|
|
+#define SMAASampleLevelZero(tex, coord) textureLod(tex, coord, 0.0)
|
|
|
+#define SMAASampleLevelZeroPoint(tex, coord) textureLod(tex, coord, 0.0)
|
|
|
+#define SMAASampleLevelZeroOffset(tex, coord, offset) textureLodOffset(tex, coord, 0.0, offset)
|
|
|
+#define SMAASample(tex, coord) texture(tex, coord)
|
|
|
+#define SMAASamplePoint(tex, coord) texture(tex, coord)
|
|
|
+#define SMAASampleOffset(tex, coord, offset) texture(tex, coord, offset)
|
|
|
+#define SMAA_FLATTEN
|
|
|
+#define SMAA_BRANCH
|
|
|
+#define lerp(a, b, t) mix(a, b, t)
|
|
|
+#define saturate(a) clamp(a, 0.0, 1.0)
|
|
|
+#if defined(SMAA_GLSL_4)
|
|
|
+#define mad(a, b, c) fma(a, b, c)
|
|
|
+#define SMAAGather(tex, coord) textureGather(tex, coord)
|
|
|
+#else
|
|
|
+#define mad(a, b, c) (a * b + c)
|
|
|
+#endif
|
|
|
+#define float2 vec2
|
|
|
+#define float3 vec3
|
|
|
+#define float4 vec4
|
|
|
+#define int2 ivec2
|
|
|
+#define int3 ivec3
|
|
|
+#define int4 ivec4
|
|
|
+#define bool2 bvec2
|
|
|
+#define bool3 bvec3
|
|
|
+#define bool4 bvec4
|
|
|
+#endif
|
|
|
+
|
|
|
+#if !defined(SMAA_HLSL_3) && !defined(SMAA_HLSL_4) && !defined(SMAA_HLSL_4_1) && !defined(SMAA_GLSL_3) && !defined(SMAA_GLSL_4) && !defined(SMAA_CUSTOM_SL)
|
|
|
+#error you must define the shading language: SMAA_HLSL_*, SMAA_GLSL_* or SMAA_CUSTOM_SL
|
|
|
+#endif
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Misc functions
|
|
|
+
|
|
|
+/**
|
|
|
+ * Gathers current pixel, and the top-left neighbors.
|
|
|
+ */
|
|
|
+float3 SMAAGatherNeighbours(float2 texcoord,
|
|
|
+ float4 offset[3],
|
|
|
+ SMAATexture2D(tex)) {
|
|
|
+ #ifdef SMAAGather
|
|
|
+ return SMAAGather(tex, texcoord + SMAA_RT_METRICS.xy * float2(-0.5, -0.5)).grb;
|
|
|
+ #else
|
|
|
+ float P = SMAASamplePoint(tex, texcoord).r;
|
|
|
+ float Pleft = SMAASamplePoint(tex, offset[0].xy).r;
|
|
|
+ float Ptop = SMAASamplePoint(tex, offset[0].zw).r;
|
|
|
+ return float3(P, Pleft, Ptop);
|
|
|
+ #endif
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Adjusts the threshold by means of predication.
|
|
|
+ */
|
|
|
+float2 SMAACalculatePredicatedThreshold(float2 texcoord,
|
|
|
+ float4 offset[3],
|
|
|
+ SMAATexture2D(predicationTex)) {
|
|
|
+ float3 neighbours = SMAAGatherNeighbours(texcoord, offset, SMAATexturePass2D(predicationTex));
|
|
|
+ float2 delta = abs(neighbours.xx - neighbours.yz);
|
|
|
+ float2 edges = step(SMAA_PREDICATION_THRESHOLD, delta);
|
|
|
+ return SMAA_PREDICATION_SCALE * SMAA_THRESHOLD * (1.0 - SMAA_PREDICATION_STRENGTH * edges);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Conditional move:
|
|
|
+ */
|
|
|
+void SMAAMovc(bool2 cond, inout float2 variable, float2 value) {
|
|
|
+ SMAA_FLATTEN if (cond.x) variable.x = value.x;
|
|
|
+ SMAA_FLATTEN if (cond.y) variable.y = value.y;
|
|
|
+}
|
|
|
+
|
|
|
+void SMAAMovc(bool4 cond, inout float4 variable, float4 value) {
|
|
|
+ SMAAMovc(cond.xy, variable.xy, value.xy);
|
|
|
+ SMAAMovc(cond.zw, variable.zw, value.zw);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+#if SMAA_INCLUDE_VS
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Vertex Shaders
|
|
|
+
|
|
|
+/**
|
|
|
+ * Edge Detection Vertex Shader
|
|
|
+ */
|
|
|
+void SMAAEdgeDetectionVS(float2 texcoord,
|
|
|
+ out float4 offset[3]) {
|
|
|
+ offset[0] = mad(SMAA_RT_METRICS.xyxy, float4(-1.0, 0.0, 0.0, -1.0), texcoord.xyxy);
|
|
|
+ offset[1] = mad(SMAA_RT_METRICS.xyxy, float4( 1.0, 0.0, 0.0, 1.0), texcoord.xyxy);
|
|
|
+ offset[2] = mad(SMAA_RT_METRICS.xyxy, float4(-2.0, 0.0, 0.0, -2.0), texcoord.xyxy);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Blend Weight Calculation Vertex Shader
|
|
|
+ */
|
|
|
+void SMAABlendingWeightCalculationVS(float2 texcoord,
|
|
|
+ out float2 pixcoord,
|
|
|
+ out float4 offset[3]) {
|
|
|
+ pixcoord = texcoord * SMAA_RT_METRICS.zw;
|
|
|
+
|
|
|
+ // We will use these offsets for the searches later on (see @PSEUDO_GATHER4):
|
|
|
+ offset[0] = mad(SMAA_RT_METRICS.xyxy, float4(-0.25, -0.125, 1.25, -0.125), texcoord.xyxy);
|
|
|
+ offset[1] = mad(SMAA_RT_METRICS.xyxy, float4(-0.125, -0.25, -0.125, 1.25), texcoord.xyxy);
|
|
|
+
|
|
|
+ // And these for the searches, they indicate the ends of the loops:
|
|
|
+ offset[2] = mad(SMAA_RT_METRICS.xxyy,
|
|
|
+ float4(-2.0, 2.0, -2.0, 2.0) * float(SMAA_MAX_SEARCH_STEPS),
|
|
|
+ float4(offset[0].xz, offset[1].yw));
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Neighborhood Blending Vertex Shader
|
|
|
+ */
|
|
|
+void SMAANeighborhoodBlendingVS(float2 texcoord,
|
|
|
+ out float4 offset) {
|
|
|
+ offset = mad(SMAA_RT_METRICS.xyxy, float4( 1.0, 0.0, 0.0, 1.0), texcoord.xyxy);
|
|
|
+}
|
|
|
+#endif // SMAA_INCLUDE_VS
|
|
|
+
|
|
|
+#if SMAA_INCLUDE_PS
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Edge Detection Pixel Shaders (First Pass)
|
|
|
+
|
|
|
+/**
|
|
|
+ * Luma Edge Detection
|
|
|
+ *
|
|
|
+ * IMPORTANT NOTICE: luma edge detection requires gamma-corrected colors, and
|
|
|
+ * thus 'colorTex' should be a non-sRGB texture.
|
|
|
+ */
|
|
|
+float2 SMAALumaEdgeDetectionPS(float2 texcoord,
|
|
|
+ float4 offset[3],
|
|
|
+ SMAATexture2D(colorTex)
|
|
|
+ #if SMAA_PREDICATION
|
|
|
+ , SMAATexture2D(predicationTex)
|
|
|
+ #endif
|
|
|
+ ) {
|
|
|
+ // Calculate the threshold:
|
|
|
+ #if SMAA_PREDICATION
|
|
|
+ float2 threshold = SMAACalculatePredicatedThreshold(texcoord, offset, SMAATexturePass2D(predicationTex));
|
|
|
+ #else
|
|
|
+ float2 threshold = float2(SMAA_THRESHOLD, SMAA_THRESHOLD);
|
|
|
+ #endif
|
|
|
+
|
|
|
+ // Calculate lumas:
|
|
|
+ float3 weights = float3(0.2126, 0.7152, 0.0722);
|
|
|
+ float L = dot(SMAASamplePoint(colorTex, texcoord).rgb, weights);
|
|
|
+
|
|
|
+ float Lleft = dot(SMAASamplePoint(colorTex, offset[0].xy).rgb, weights);
|
|
|
+ float Ltop = dot(SMAASamplePoint(colorTex, offset[0].zw).rgb, weights);
|
|
|
+
|
|
|
+ // We do the usual threshold:
|
|
|
+ float4 delta;
|
|
|
+ delta.xy = abs(L - float2(Lleft, Ltop));
|
|
|
+ float2 edges = step(threshold, delta.xy);
|
|
|
+
|
|
|
+ // Then discard if there is no edge:
|
|
|
+ if (dot(edges, float2(1.0, 1.0)) == 0.0)
|
|
|
+ discard;
|
|
|
+
|
|
|
+ // Calculate right and bottom deltas:
|
|
|
+ float Lright = dot(SMAASamplePoint(colorTex, offset[1].xy).rgb, weights);
|
|
|
+ float Lbottom = dot(SMAASamplePoint(colorTex, offset[1].zw).rgb, weights);
|
|
|
+ delta.zw = abs(L - float2(Lright, Lbottom));
|
|
|
+
|
|
|
+ // Calculate the maximum delta in the direct neighborhood:
|
|
|
+ float2 maxDelta = max(delta.xy, delta.zw);
|
|
|
+
|
|
|
+ // Calculate left-left and top-top deltas:
|
|
|
+ float Lleftleft = dot(SMAASamplePoint(colorTex, offset[2].xy).rgb, weights);
|
|
|
+ float Ltoptop = dot(SMAASamplePoint(colorTex, offset[2].zw).rgb, weights);
|
|
|
+ delta.zw = abs(float2(Lleft, Ltop) - float2(Lleftleft, Ltoptop));
|
|
|
+
|
|
|
+ // Calculate the final maximum delta:
|
|
|
+ maxDelta = max(maxDelta.xy, delta.zw);
|
|
|
+ float finalDelta = max(maxDelta.x, maxDelta.y);
|
|
|
+
|
|
|
+ // Local contrast adaptation:
|
|
|
+ edges.xy *= step(finalDelta, SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR * delta.xy);
|
|
|
+
|
|
|
+ return edges;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Color Edge Detection
|
|
|
+ *
|
|
|
+ * IMPORTANT NOTICE: color edge detection requires gamma-corrected colors, and
|
|
|
+ * thus 'colorTex' should be a non-sRGB texture.
|
|
|
+ */
|
|
|
+float2 SMAAColorEdgeDetectionPS(float2 texcoord,
|
|
|
+ float4 offset[3],
|
|
|
+ SMAATexture2D(colorTex)
|
|
|
+ #if SMAA_PREDICATION
|
|
|
+ , SMAATexture2D(predicationTex)
|
|
|
+ #endif
|
|
|
+ ) {
|
|
|
+ // Calculate the threshold:
|
|
|
+ #if SMAA_PREDICATION
|
|
|
+ float2 threshold = SMAACalculatePredicatedThreshold(texcoord, offset, predicationTex);
|
|
|
+ #else
|
|
|
+ float2 threshold = float2(SMAA_THRESHOLD, SMAA_THRESHOLD);
|
|
|
+ #endif
|
|
|
+
|
|
|
+ // Calculate color deltas:
|
|
|
+ float4 delta;
|
|
|
+ float3 C = SMAASamplePoint(colorTex, texcoord).rgb;
|
|
|
+
|
|
|
+ float3 Cleft = SMAASamplePoint(colorTex, offset[0].xy).rgb;
|
|
|
+ float3 t = abs(C - Cleft);
|
|
|
+ delta.x = max(max(t.r, t.g), t.b);
|
|
|
+
|
|
|
+ float3 Ctop = SMAASamplePoint(colorTex, offset[0].zw).rgb;
|
|
|
+ t = abs(C - Ctop);
|
|
|
+ delta.y = max(max(t.r, t.g), t.b);
|
|
|
+
|
|
|
+ // We do the usual threshold:
|
|
|
+ float2 edges = step(threshold, delta.xy);
|
|
|
+
|
|
|
+ // Then discard if there is no edge:
|
|
|
+ if (dot(edges, float2(1.0, 1.0)) == 0.0)
|
|
|
+ discard;
|
|
|
+
|
|
|
+ // Calculate right and bottom deltas:
|
|
|
+ float3 Cright = SMAASamplePoint(colorTex, offset[1].xy).rgb;
|
|
|
+ t = abs(C - Cright);
|
|
|
+ delta.z = max(max(t.r, t.g), t.b);
|
|
|
+
|
|
|
+ float3 Cbottom = SMAASamplePoint(colorTex, offset[1].zw).rgb;
|
|
|
+ t = abs(C - Cbottom);
|
|
|
+ delta.w = max(max(t.r, t.g), t.b);
|
|
|
+
|
|
|
+ // Calculate the maximum delta in the direct neighborhood:
|
|
|
+ float2 maxDelta = max(delta.xy, delta.zw);
|
|
|
+
|
|
|
+ // Calculate left-left and top-top deltas:
|
|
|
+ float3 Cleftleft = SMAASamplePoint(colorTex, offset[2].xy).rgb;
|
|
|
+ t = abs(Cleft - Cleftleft);
|
|
|
+ delta.z = max(max(t.r, t.g), t.b);
|
|
|
+
|
|
|
+ float3 Ctoptop = SMAASamplePoint(colorTex, offset[2].zw).rgb;
|
|
|
+ t = abs(Ctop - Ctoptop);
|
|
|
+ delta.w = max(max(t.r, t.g), t.b);
|
|
|
+
|
|
|
+ // Calculate the final maximum delta:
|
|
|
+ maxDelta = max(maxDelta.xy, delta.zw);
|
|
|
+ float finalDelta = max(maxDelta.x, maxDelta.y);
|
|
|
+
|
|
|
+ // Local contrast adaptation:
|
|
|
+ edges.xy *= step(finalDelta, SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR * delta.xy);
|
|
|
+
|
|
|
+ return edges;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Depth Edge Detection
|
|
|
+ */
|
|
|
+float2 SMAADepthEdgeDetectionPS(float2 texcoord,
|
|
|
+ float4 offset[3],
|
|
|
+ SMAATexture2D(depthTex)) {
|
|
|
+ float3 neighbours = SMAAGatherNeighbours(texcoord, offset, SMAATexturePass2D(depthTex));
|
|
|
+ float2 delta = abs(neighbours.xx - float2(neighbours.y, neighbours.z));
|
|
|
+ float2 edges = step(SMAA_DEPTH_THRESHOLD, delta);
|
|
|
+
|
|
|
+ if (dot(edges, float2(1.0, 1.0)) == 0.0)
|
|
|
+ discard;
|
|
|
+
|
|
|
+ return edges;
|
|
|
+}
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Diagonal Search Functions
|
|
|
+
|
|
|
+#if !defined(SMAA_DISABLE_DIAG_DETECTION)
|
|
|
+
|
|
|
+/**
|
|
|
+ * Allows to decode two binary values from a bilinear-filtered access.
|
|
|
+ */
|
|
|
+float2 SMAADecodeDiagBilinearAccess(float2 e) {
|
|
|
+ // Bilinear access for fetching 'e' have a 0.25 offset, and we are
|
|
|
+ // interested in the R and G edges:
|
|
|
+ //
|
|
|
+ // +---G---+-------+
|
|
|
+ // | x o R x |
|
|
|
+ // +-------+-------+
|
|
|
+ //
|
|
|
+ // Then, if one of these edge is enabled:
|
|
|
+ // Red: (0.75 * X + 0.25 * 1) => 0.25 or 1.0
|
|
|
+ // Green: (0.75 * 1 + 0.25 * X) => 0.75 or 1.0
|
|
|
+ //
|
|
|
+ // This function will unpack the values (mad + mul + round):
|
|
|
+ // wolframalpha.com: round(x * abs(5 * x - 5 * 0.75)) plot 0 to 1
|
|
|
+ e.r = e.r * abs(5.0 * e.r - 5.0 * 0.75);
|
|
|
+ return round(e);
|
|
|
+}
|
|
|
+
|
|
|
+float4 SMAADecodeDiagBilinearAccess(float4 e) {
|
|
|
+ e.rb = e.rb * abs(5.0 * e.rb - 5.0 * 0.75);
|
|
|
+ return round(e);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * These functions allows to perform diagonal pattern searches.
|
|
|
+ */
|
|
|
+float2 SMAASearchDiag1(SMAATexture2D(edgesTex), float2 texcoord, float2 dir, out float2 e) {
|
|
|
+ float4 coord = float4(texcoord, -1.0, 1.0);
|
|
|
+ float3 t = float3(SMAA_RT_METRICS.xy, 1.0);
|
|
|
+ while (coord.z < float(SMAA_MAX_SEARCH_STEPS_DIAG - 1) &&
|
|
|
+ coord.w > 0.9) {
|
|
|
+ coord.xyz = mad(t, float3(dir, 1.0), coord.xyz);
|
|
|
+ e = SMAASampleLevelZero(edgesTex, coord.xy).rg;
|
|
|
+ coord.w = dot(e, float2(0.5, 0.5));
|
|
|
+ }
|
|
|
+ return coord.zw;
|
|
|
+}
|
|
|
+
|
|
|
+float2 SMAASearchDiag2(SMAATexture2D(edgesTex), float2 texcoord, float2 dir, out float2 e) {
|
|
|
+ float4 coord = float4(texcoord, -1.0, 1.0);
|
|
|
+ coord.x += 0.25 * SMAA_RT_METRICS.x; // See @SearchDiag2Optimization
|
|
|
+ float3 t = float3(SMAA_RT_METRICS.xy, 1.0);
|
|
|
+ while (coord.z < float(SMAA_MAX_SEARCH_STEPS_DIAG - 1) &&
|
|
|
+ coord.w > 0.9) {
|
|
|
+ coord.xyz = mad(t, float3(dir, 1.0), coord.xyz);
|
|
|
+
|
|
|
+ // @SearchDiag2Optimization
|
|
|
+ // Fetch both edges at once using bilinear filtering:
|
|
|
+ e = SMAASampleLevelZero(edgesTex, coord.xy).rg;
|
|
|
+ e = SMAADecodeDiagBilinearAccess(e);
|
|
|
+
|
|
|
+ // Non-optimized version:
|
|
|
+ // e.g = SMAASampleLevelZero(edgesTex, coord.xy).g;
|
|
|
+ // e.r = SMAASampleLevelZeroOffset(edgesTex, coord.xy, int2(1, 0)).r;
|
|
|
+
|
|
|
+ coord.w = dot(e, float2(0.5, 0.5));
|
|
|
+ }
|
|
|
+ return coord.zw;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Similar to SMAAArea, this calculates the area corresponding to a certain
|
|
|
+ * diagonal distance and crossing edges 'e'.
|
|
|
+ */
|
|
|
+float2 SMAAAreaDiag(SMAATexture2D(areaTex), float2 dist, float2 e, float offset) {
|
|
|
+ float2 texcoord = mad(float2(SMAA_AREATEX_MAX_DISTANCE_DIAG, SMAA_AREATEX_MAX_DISTANCE_DIAG), e, dist);
|
|
|
+
|
|
|
+ // We do a scale and bias for mapping to texel space:
|
|
|
+ texcoord = mad(SMAA_AREATEX_PIXEL_SIZE, texcoord, 0.5 * SMAA_AREATEX_PIXEL_SIZE);
|
|
|
+
|
|
|
+ // Diagonal areas are on the second half of the texture:
|
|
|
+ texcoord.x += 0.5;
|
|
|
+
|
|
|
+ // Move to proper place, according to the subpixel offset:
|
|
|
+ texcoord.y += SMAA_AREATEX_SUBTEX_SIZE * offset;
|
|
|
+
|
|
|
+ // Do it!
|
|
|
+ return SMAA_AREATEX_SELECT(SMAASampleLevelZero(areaTex, texcoord));
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * This searches for diagonal patterns and returns the corresponding weights.
|
|
|
+ */
|
|
|
+float2 SMAACalculateDiagWeights(SMAATexture2D(edgesTex), SMAATexture2D(areaTex), float2 texcoord, float2 e, float4 subsampleIndices) {
|
|
|
+ float2 weights = float2(0.0, 0.0);
|
|
|
+
|
|
|
+ // Search for the line ends:
|
|
|
+ float4 d;
|
|
|
+ float2 end;
|
|
|
+ if (e.r > 0.0) {
|
|
|
+ d.xz = SMAASearchDiag1(SMAATexturePass2D(edgesTex), texcoord, float2(-1.0, 1.0), end);
|
|
|
+ d.x += float(end.y > 0.9);
|
|
|
+ } else
|
|
|
+ d.xz = float2(0.0, 0.0);
|
|
|
+ d.yw = SMAASearchDiag1(SMAATexturePass2D(edgesTex), texcoord, float2(1.0, -1.0), end);
|
|
|
+
|
|
|
+ SMAA_BRANCH
|
|
|
+ if (d.x + d.y > 2.0) { // d.x + d.y + 1 > 3
|
|
|
+ // Fetch the crossing edges:
|
|
|
+ float4 coords = mad(float4(-d.x + 0.25, d.x, d.y, -d.y - 0.25), SMAA_RT_METRICS.xyxy, texcoord.xyxy);
|
|
|
+ float4 c;
|
|
|
+ c.xy = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2(-1, 0)).rg;
|
|
|
+ c.zw = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1, 0)).rg;
|
|
|
+ c.yxwz = SMAADecodeDiagBilinearAccess(c.xyzw);
|
|
|
+
|
|
|
+ // Non-optimized version:
|
|
|
+ // float4 coords = mad(float4(-d.x, d.x, d.y, -d.y), SMAA_RT_METRICS.xyxy, texcoord.xyxy);
|
|
|
+ // float4 c;
|
|
|
+ // c.x = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2(-1, 0)).g;
|
|
|
+ // c.y = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2( 0, 0)).r;
|
|
|
+ // c.z = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1, 0)).g;
|
|
|
+ // c.w = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1, -1)).r;
|
|
|
+
|
|
|
+ // Merge crossing edges at each side into a single value:
|
|
|
+ float2 cc = mad(float2(2.0, 2.0), c.xz, c.yw);
|
|
|
+
|
|
|
+ // Remove the crossing edge if we didn't found the end of the line:
|
|
|
+ SMAAMovc(bool2(step(0.9, d.zw)), cc, float2(0.0, 0.0));
|
|
|
+
|
|
|
+ // Fetch the areas for this line:
|
|
|
+ weights += SMAAAreaDiag(SMAATexturePass2D(areaTex), d.xy, cc, subsampleIndices.z);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Search for the line ends:
|
|
|
+ d.xz = SMAASearchDiag2(SMAATexturePass2D(edgesTex), texcoord, float2(-1.0, -1.0), end);
|
|
|
+ if (SMAASampleLevelZeroOffset(edgesTex, texcoord, int2(1, 0)).r > 0.0) {
|
|
|
+ d.yw = SMAASearchDiag2(SMAATexturePass2D(edgesTex), texcoord, float2(1.0, 1.0), end);
|
|
|
+ d.y += float(end.y > 0.9);
|
|
|
+ } else
|
|
|
+ d.yw = float2(0.0, 0.0);
|
|
|
+
|
|
|
+ SMAA_BRANCH
|
|
|
+ if (d.x + d.y > 2.0) { // d.x + d.y + 1 > 3
|
|
|
+ // Fetch the crossing edges:
|
|
|
+ float4 coords = mad(float4(-d.x, -d.x, d.y, d.y), SMAA_RT_METRICS.xyxy, texcoord.xyxy);
|
|
|
+ float4 c;
|
|
|
+ c.x = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2(-1, 0)).g;
|
|
|
+ c.y = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2( 0, -1)).r;
|
|
|
+ c.zw = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1, 0)).gr;
|
|
|
+ float2 cc = mad(float2(2.0, 2.0), c.xz, c.yw);
|
|
|
+
|
|
|
+ // Remove the crossing edge if we didn't found the end of the line:
|
|
|
+ SMAAMovc(bool2(step(0.9, d.zw)), cc, float2(0.0, 0.0));
|
|
|
+
|
|
|
+ // Fetch the areas for this line:
|
|
|
+ weights += SMAAAreaDiag(SMAATexturePass2D(areaTex), d.xy, cc, subsampleIndices.w).gr;
|
|
|
+ }
|
|
|
+
|
|
|
+ return weights;
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Horizontal/Vertical Search Functions
|
|
|
+
|
|
|
+/**
|
|
|
+ * This allows to determine how much length should we add in the last step
|
|
|
+ * of the searches. It takes the bilinearly interpolated edge (see
|
|
|
+ * @PSEUDO_GATHER4), and adds 0, 1 or 2, depending on which edges and
|
|
|
+ * crossing edges are active.
|
|
|
+ */
|
|
|
+float SMAASearchLength(SMAATexture2D(searchTex), float2 e, float offset) {
|
|
|
+ // The texture is flipped vertically, with left and right cases taking half
|
|
|
+ // of the space horizontally:
|
|
|
+ float2 scale = SMAA_SEARCHTEX_SIZE * float2(0.5, -1.0);
|
|
|
+ float2 bias = SMAA_SEARCHTEX_SIZE * float2(offset, 1.0);
|
|
|
+
|
|
|
+ // Scale and bias to access texel centers:
|
|
|
+ scale += float2(-1.0, 1.0);
|
|
|
+ bias += float2( 0.5, -0.5);
|
|
|
+
|
|
|
+ // Convert from pixel coordinates to texcoords:
|
|
|
+ // (We use SMAA_SEARCHTEX_PACKED_SIZE because the texture is cropped)
|
|
|
+ scale *= 1.0 / SMAA_SEARCHTEX_PACKED_SIZE;
|
|
|
+ bias *= 1.0 / SMAA_SEARCHTEX_PACKED_SIZE;
|
|
|
+
|
|
|
+ // Lookup the search texture:
|
|
|
+ return SMAA_SEARCHTEX_SELECT(SMAASampleLevelZero(searchTex, mad(scale, e, bias)));
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Horizontal/vertical search functions for the 2nd pass.
|
|
|
+ */
|
|
|
+float SMAASearchXLeft(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
|
|
|
+ /**
|
|
|
+ * @PSEUDO_GATHER4
|
|
|
+ * This texcoord has been offset by (-0.25, -0.125) in the vertex shader to
|
|
|
+ * sample between edge, thus fetching four edges in a row.
|
|
|
+ * Sampling with different offsets in each direction allows to disambiguate
|
|
|
+ * which edges are active from the four fetched ones.
|
|
|
+ */
|
|
|
+ float2 e = float2(0.0, 1.0);
|
|
|
+ while (texcoord.x > end &&
|
|
|
+ e.g > 0.8281 && // Is there some edge not activated?
|
|
|
+ e.r == 0.0) { // Or is there a crossing edge that breaks the line?
|
|
|
+ e = SMAASampleLevelZero(edgesTex, texcoord).rg;
|
|
|
+ texcoord = mad(-float2(2.0, 0.0), SMAA_RT_METRICS.xy, texcoord);
|
|
|
+ }
|
|
|
+
|
|
|
+ float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e, 0.0), 3.25);
|
|
|
+ return mad(SMAA_RT_METRICS.x, offset, texcoord.x);
|
|
|
+
|
|
|
+ // Non-optimized version:
|
|
|
+ // We correct the previous (-0.25, -0.125) offset we applied:
|
|
|
+ // texcoord.x += 0.25 * SMAA_RT_METRICS.x;
|
|
|
+
|
|
|
+ // The searches are bias by 1, so adjust the coords accordingly:
|
|
|
+ // texcoord.x += SMAA_RT_METRICS.x;
|
|
|
+
|
|
|
+ // Disambiguate the length added by the last step:
|
|
|
+ // texcoord.x += 2.0 * SMAA_RT_METRICS.x; // Undo last step
|
|
|
+ // texcoord.x -= SMAA_RT_METRICS.x * (255.0 / 127.0) * SMAASearchLength(SMAATexturePass2D(searchTex), e, 0.0);
|
|
|
+ // return mad(SMAA_RT_METRICS.x, offset, texcoord.x);
|
|
|
+}
|
|
|
+
|
|
|
+float SMAASearchXRight(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
|
|
|
+ float2 e = float2(0.0, 1.0);
|
|
|
+ while (texcoord.x < end &&
|
|
|
+ e.g > 0.8281 && // Is there some edge not activated?
|
|
|
+ e.r == 0.0) { // Or is there a crossing edge that breaks the line?
|
|
|
+ e = SMAASampleLevelZero(edgesTex, texcoord).rg;
|
|
|
+ texcoord = mad(float2(2.0, 0.0), SMAA_RT_METRICS.xy, texcoord);
|
|
|
+ }
|
|
|
+ float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e, 0.5), 3.25);
|
|
|
+ return mad(-SMAA_RT_METRICS.x, offset, texcoord.x);
|
|
|
+}
|
|
|
+
|
|
|
+float SMAASearchYUp(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
|
|
|
+ float2 e = float2(1.0, 0.0);
|
|
|
+ while (texcoord.y > end &&
|
|
|
+ e.r > 0.8281 && // Is there some edge not activated?
|
|
|
+ e.g == 0.0) { // Or is there a crossing edge that breaks the line?
|
|
|
+ e = SMAASampleLevelZero(edgesTex, texcoord).rg;
|
|
|
+ texcoord = mad(-float2(0.0, 2.0), SMAA_RT_METRICS.xy, texcoord);
|
|
|
+ }
|
|
|
+ float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e.gr, 0.0), 3.25);
|
|
|
+ return mad(SMAA_RT_METRICS.y, offset, texcoord.y);
|
|
|
+}
|
|
|
+
|
|
|
+float SMAASearchYDown(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
|
|
|
+ float2 e = float2(1.0, 0.0);
|
|
|
+ while (texcoord.y < end &&
|
|
|
+ e.r > 0.8281 && // Is there some edge not activated?
|
|
|
+ e.g == 0.0) { // Or is there a crossing edge that breaks the line?
|
|
|
+ e = SMAASampleLevelZero(edgesTex, texcoord).rg;
|
|
|
+ texcoord = mad(float2(0.0, 2.0), SMAA_RT_METRICS.xy, texcoord);
|
|
|
+ }
|
|
|
+ float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e.gr, 0.5), 3.25);
|
|
|
+ return mad(-SMAA_RT_METRICS.y, offset, texcoord.y);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Ok, we have the distance and both crossing edges. So, what are the areas
|
|
|
+ * at each side of current edge?
|
|
|
+ */
|
|
|
+float2 SMAAArea(SMAATexture2D(areaTex), float2 dist, float e1, float e2, float offset) {
|
|
|
+ // Rounding prevents precision errors of bilinear filtering:
|
|
|
+ float2 texcoord = mad(float2(SMAA_AREATEX_MAX_DISTANCE, SMAA_AREATEX_MAX_DISTANCE), round(4.0 * float2(e1, e2)), dist);
|
|
|
+
|
|
|
+ // We do a scale and bias for mapping to texel space:
|
|
|
+ texcoord = mad(SMAA_AREATEX_PIXEL_SIZE, texcoord, 0.5 * SMAA_AREATEX_PIXEL_SIZE);
|
|
|
+
|
|
|
+ // Move to proper place, according to the subpixel offset:
|
|
|
+ texcoord.y = mad(SMAA_AREATEX_SUBTEX_SIZE, offset, texcoord.y);
|
|
|
+
|
|
|
+ // Do it!
|
|
|
+ return SMAA_AREATEX_SELECT(SMAASampleLevelZero(areaTex, texcoord));
|
|
|
+}
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Corner Detection Functions
|
|
|
+
|
|
|
+void SMAADetectHorizontalCornerPattern(SMAATexture2D(edgesTex), inout float2 weights, float4 texcoord, float2 d) {
|
|
|
+ #if !defined(SMAA_DISABLE_CORNER_DETECTION)
|
|
|
+ float2 leftRight = step(d.xy, d.yx);
|
|
|
+ float2 rounding = (1.0 - SMAA_CORNER_ROUNDING_NORM) * leftRight;
|
|
|
+
|
|
|
+ rounding /= leftRight.x + leftRight.y; // Reduce blending for pixels in the center of a line.
|
|
|
+
|
|
|
+ float2 factor = float2(1.0, 1.0);
|
|
|
+ factor.x -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2(0, 1)).r;
|
|
|
+ factor.x -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2(1, 1)).r;
|
|
|
+ factor.y -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2(0, -2)).r;
|
|
|
+ factor.y -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2(1, -2)).r;
|
|
|
+
|
|
|
+ weights *= saturate(factor);
|
|
|
+ #endif
|
|
|
+}
|
|
|
+
|
|
|
+void SMAADetectVerticalCornerPattern(SMAATexture2D(edgesTex), inout float2 weights, float4 texcoord, float2 d) {
|
|
|
+ #if !defined(SMAA_DISABLE_CORNER_DETECTION)
|
|
|
+ float2 leftRight = step(d.xy, d.yx);
|
|
|
+ float2 rounding = (1.0 - SMAA_CORNER_ROUNDING_NORM) * leftRight;
|
|
|
+
|
|
|
+ rounding /= leftRight.x + leftRight.y;
|
|
|
+
|
|
|
+ float2 factor = float2(1.0, 1.0);
|
|
|
+ factor.x -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2( 1, 0)).g;
|
|
|
+ factor.x -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2( 1, 1)).g;
|
|
|
+ factor.y -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2(-2, 0)).g;
|
|
|
+ factor.y -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2(-2, 1)).g;
|
|
|
+
|
|
|
+ weights *= saturate(factor);
|
|
|
+ #endif
|
|
|
+}
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Blending Weight Calculation Pixel Shader (Second Pass)
|
|
|
+
|
|
|
+float4 SMAABlendingWeightCalculationPS(float2 texcoord,
|
|
|
+ float2 pixcoord,
|
|
|
+ float4 offset[3],
|
|
|
+ SMAATexture2D(edgesTex),
|
|
|
+ SMAATexture2D(areaTex),
|
|
|
+ SMAATexture2D(searchTex),
|
|
|
+ float4 subsampleIndices) { // Just pass zero for SMAA 1x, see @SUBSAMPLE_INDICES.
|
|
|
+ float4 weights = float4(0.0, 0.0, 0.0, 0.0);
|
|
|
+
|
|
|
+ float2 e = SMAASample(edgesTex, texcoord).rg;
|
|
|
+
|
|
|
+ SMAA_BRANCH
|
|
|
+ if (e.g > 0.0) { // Edge at north
|
|
|
+ #if !defined(SMAA_DISABLE_DIAG_DETECTION)
|
|
|
+ // Diagonals have both north and west edges, so searching for them in
|
|
|
+ // one of the boundaries is enough.
|
|
|
+ weights.rg = SMAACalculateDiagWeights(SMAATexturePass2D(edgesTex), SMAATexturePass2D(areaTex), texcoord, e, subsampleIndices);
|
|
|
+
|
|
|
+ // We give priority to diagonals, so if we find a diagonal we skip
|
|
|
+ // horizontal/vertical processing.
|
|
|
+ SMAA_BRANCH
|
|
|
+ if (weights.r == -weights.g) { // weights.r + weights.g == 0.0
|
|
|
+ #endif
|
|
|
+
|
|
|
+ float2 d;
|
|
|
+
|
|
|
+ // Find the distance to the left:
|
|
|
+ float3 coords;
|
|
|
+ coords.x = SMAASearchXLeft(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[0].xy, offset[2].x);
|
|
|
+ coords.y = offset[1].y; // offset[1].y = texcoord.y - 0.25 * SMAA_RT_METRICS.y (@CROSSING_OFFSET)
|
|
|
+ d.x = coords.x;
|
|
|
+
|
|
|
+ // Now fetch the left crossing edges, two at a time using bilinear
|
|
|
+ // filtering. Sampling at -0.25 (see @CROSSING_OFFSET) enables to
|
|
|
+ // discern what value each edge has:
|
|
|
+ float e1 = SMAASampleLevelZero(edgesTex, coords.xy).r;
|
|
|
+
|
|
|
+ // Find the distance to the right:
|
|
|
+ coords.z = SMAASearchXRight(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[0].zw, offset[2].y);
|
|
|
+ d.y = coords.z;
|
|
|
+
|
|
|
+ // We want the distances to be in pixel units (doing this here allow to
|
|
|
+ // better interleave arithmetic and memory accesses):
|
|
|
+ d = abs(round(mad(SMAA_RT_METRICS.zz, d, -pixcoord.xx)));
|
|
|
+
|
|
|
+ // SMAAArea below needs a sqrt, as the areas texture is compressed
|
|
|
+ // quadratically:
|
|
|
+ float2 sqrt_d = sqrt(d);
|
|
|
+
|
|
|
+ // Fetch the right crossing edges:
|
|
|
+ float e2 = SMAASampleLevelZeroOffset(edgesTex, coords.zy, int2(1, 0)).r;
|
|
|
+
|
|
|
+ // Ok, we know how this pattern looks like, now it is time for getting
|
|
|
+ // the actual area:
|
|
|
+ weights.rg = SMAAArea(SMAATexturePass2D(areaTex), sqrt_d, e1, e2, subsampleIndices.y);
|
|
|
+
|
|
|
+ // Fix corners:
|
|
|
+ coords.y = texcoord.y;
|
|
|
+ SMAADetectHorizontalCornerPattern(SMAATexturePass2D(edgesTex), weights.rg, coords.xyzy, d);
|
|
|
+
|
|
|
+ #if !defined(SMAA_DISABLE_DIAG_DETECTION)
|
|
|
+ } else
|
|
|
+ e.r = 0.0; // Skip vertical processing.
|
|
|
+ #endif
|
|
|
+ }
|
|
|
+
|
|
|
+ SMAA_BRANCH
|
|
|
+ if (e.r > 0.0) { // Edge at west
|
|
|
+ float2 d;
|
|
|
+
|
|
|
+ // Find the distance to the top:
|
|
|
+ float3 coords;
|
|
|
+ coords.y = SMAASearchYUp(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[1].xy, offset[2].z);
|
|
|
+ coords.x = offset[0].x; // offset[1].x = texcoord.x - 0.25 * SMAA_RT_METRICS.x;
|
|
|
+ d.x = coords.y;
|
|
|
+
|
|
|
+ // Fetch the top crossing edges:
|
|
|
+ float e1 = SMAASampleLevelZero(edgesTex, coords.xy).g;
|
|
|
+
|
|
|
+ // Find the distance to the bottom:
|
|
|
+ coords.z = SMAASearchYDown(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[1].zw, offset[2].w);
|
|
|
+ d.y = coords.z;
|
|
|
+
|
|
|
+ // We want the distances to be in pixel units:
|
|
|
+ d = abs(round(mad(SMAA_RT_METRICS.ww, d, -pixcoord.yy)));
|
|
|
+
|
|
|
+ // SMAAArea below needs a sqrt, as the areas texture is compressed
|
|
|
+ // quadratically:
|
|
|
+ float2 sqrt_d = sqrt(d);
|
|
|
+
|
|
|
+ // Fetch the bottom crossing edges:
|
|
|
+ float e2 = SMAASampleLevelZeroOffset(edgesTex, coords.xz, int2(0, 1)).g;
|
|
|
+
|
|
|
+ // Get the area for this direction:
|
|
|
+ weights.ba = SMAAArea(SMAATexturePass2D(areaTex), sqrt_d, e1, e2, subsampleIndices.x);
|
|
|
+
|
|
|
+ // Fix corners:
|
|
|
+ coords.x = texcoord.x;
|
|
|
+ SMAADetectVerticalCornerPattern(SMAATexturePass2D(edgesTex), weights.ba, coords.xyxz, d);
|
|
|
+ }
|
|
|
+
|
|
|
+ return weights;
|
|
|
+}
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Neighborhood Blending Pixel Shader (Third Pass)
|
|
|
+
|
|
|
+float4 SMAANeighborhoodBlendingPS(float2 texcoord,
|
|
|
+ float4 offset,
|
|
|
+ SMAATexture2D(colorTex),
|
|
|
+ SMAATexture2D(blendTex)
|
|
|
+ #if SMAA_REPROJECTION
|
|
|
+ , SMAATexture2D(velocityTex)
|
|
|
+ #endif
|
|
|
+ ) {
|
|
|
+ // Fetch the blending weights for current pixel:
|
|
|
+ float4 a;
|
|
|
+ a.x = SMAASample(blendTex, offset.xy).a; // Right
|
|
|
+ a.y = SMAASample(blendTex, offset.zw).g; // Top
|
|
|
+ a.wz = SMAASample(blendTex, texcoord).xz; // Bottom / Left
|
|
|
+
|
|
|
+ // Is there any blending weight with a value greater than 0.0?
|
|
|
+ SMAA_BRANCH
|
|
|
+ if (dot(a, float4(1.0, 1.0, 1.0, 1.0)) < 1e-5) {
|
|
|
+ float4 color = SMAASampleLevelZero(colorTex, texcoord);
|
|
|
+
|
|
|
+ #if SMAA_REPROJECTION
|
|
|
+ float2 velocity = SMAA_DECODE_VELOCITY(SMAASampleLevelZero(velocityTex, texcoord));
|
|
|
+
|
|
|
+ // Pack velocity into the alpha channel:
|
|
|
+ color.a = sqrt(5.0 * length(velocity));
|
|
|
+ #endif
|
|
|
+
|
|
|
+ return color;
|
|
|
+ } else {
|
|
|
+ bool h = max(a.x, a.z) > max(a.y, a.w); // max(horizontal) > max(vertical)
|
|
|
+
|
|
|
+ // Calculate the blending offsets:
|
|
|
+ float4 blendingOffset = float4(0.0, a.y, 0.0, a.w);
|
|
|
+ float2 blendingWeight = a.yw;
|
|
|
+ SMAAMovc(bool4(h, h, h, h), blendingOffset, float4(a.x, 0.0, a.z, 0.0));
|
|
|
+ SMAAMovc(bool2(h, h), blendingWeight, a.xz);
|
|
|
+ blendingWeight /= dot(blendingWeight, float2(1.0, 1.0));
|
|
|
+
|
|
|
+ // Calculate the texture coordinates:
|
|
|
+ float4 blendingCoord = mad(blendingOffset, float4(SMAA_RT_METRICS.xy, -SMAA_RT_METRICS.xy), texcoord.xyxy);
|
|
|
+
|
|
|
+ // We exploit bilinear filtering to mix current pixel with the chosen
|
|
|
+ // neighbor:
|
|
|
+ float4 color = blendingWeight.x * SMAASampleLevelZero(colorTex, blendingCoord.xy);
|
|
|
+ color += blendingWeight.y * SMAASampleLevelZero(colorTex, blendingCoord.zw);
|
|
|
+
|
|
|
+ #if SMAA_REPROJECTION
|
|
|
+ // Antialias velocity for proper reprojection in a later stage:
|
|
|
+ float2 velocity = blendingWeight.x * SMAA_DECODE_VELOCITY(SMAASampleLevelZero(velocityTex, blendingCoord.xy));
|
|
|
+ velocity += blendingWeight.y * SMAA_DECODE_VELOCITY(SMAASampleLevelZero(velocityTex, blendingCoord.zw));
|
|
|
+
|
|
|
+ // Pack velocity into the alpha channel:
|
|
|
+ color.a = sqrt(5.0 * length(velocity));
|
|
|
+ #endif
|
|
|
+
|
|
|
+ return color;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Temporal Resolve Pixel Shader (Optional Pass)
|
|
|
+
|
|
|
+float4 SMAAResolvePS(float2 texcoord,
|
|
|
+ SMAATexture2D(currentColorTex),
|
|
|
+ SMAATexture2D(previousColorTex)
|
|
|
+ #if SMAA_REPROJECTION
|
|
|
+ , SMAATexture2D(velocityTex)
|
|
|
+ #endif
|
|
|
+ ) {
|
|
|
+ #if SMAA_REPROJECTION
|
|
|
+ // Velocity is assumed to be calculated for motion blur, so we need to
|
|
|
+ // inverse it for reprojection:
|
|
|
+ float2 velocity = -SMAA_DECODE_VELOCITY(SMAASamplePoint(velocityTex, texcoord).rg);
|
|
|
+
|
|
|
+ // Fetch current pixel:
|
|
|
+ float4 current = SMAASamplePoint(currentColorTex, texcoord);
|
|
|
+
|
|
|
+ // Reproject current coordinates and fetch previous pixel:
|
|
|
+ float4 previous = SMAASamplePoint(previousColorTex, texcoord + velocity);
|
|
|
+
|
|
|
+ // Attenuate the previous pixel if the velocity is different:
|
|
|
+ float delta = abs(current.a * current.a - previous.a * previous.a) / 5.0;
|
|
|
+ float weight = 0.5 * saturate(1.0 - sqrt(delta) * SMAA_REPROJECTION_WEIGHT_SCALE);
|
|
|
+
|
|
|
+ // Blend the pixels according to the calculated weight:
|
|
|
+ return lerp(current, previous, weight);
|
|
|
+ #else
|
|
|
+ // Just blend the pixels:
|
|
|
+ float4 current = SMAASamplePoint(currentColorTex, texcoord);
|
|
|
+ float4 previous = SMAASamplePoint(previousColorTex, texcoord);
|
|
|
+ return lerp(current, previous, 0.5);
|
|
|
+ #endif
|
|
|
+}
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+// Separate Multisamples Pixel Shader (Optional Pass)
|
|
|
+
|
|
|
+#ifdef SMAALoad
|
|
|
+void SMAASeparatePS(float4 position,
|
|
|
+ float2 texcoord,
|
|
|
+ out float4 target0,
|
|
|
+ out float4 target1,
|
|
|
+ SMAATexture2DMS2(colorTexMS)) {
|
|
|
+ int2 pos = int2(position.xy);
|
|
|
+ target0 = SMAALoad(colorTexMS, pos, 0);
|
|
|
+ target1 = SMAALoad(colorTexMS, pos, 1);
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+//-----------------------------------------------------------------------------
|
|
|
+#endif // SMAA_INCLUDE_PS
|
Brian Roberts