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+/*
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+ * Copyright 2011-2014 Branimir Karadzic. All rights reserved.
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+ * License: http://www.opensource.org/licenses/BSD-2-Clause
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+ */
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+
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+#include "common.h"
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+
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+#include <bgfx.h>
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+#include <bx/timer.h>
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+#include "fpumath.h"
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+#include "imgui/imgui.h"
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+
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+#include <stdio.h>
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+#include <string.h>
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+
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+struct PosColorVertex
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+{
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+ float m_x;
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+ float m_y;
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+ float m_z;
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+ uint32_t m_abgr;
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+
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+ static void init()
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+ {
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+ ms_decl.begin();
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+ ms_decl.add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float);
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+ ms_decl.add(bgfx::Attrib::Color0, 4, bgfx::AttribType::Uint8, true);
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+ ms_decl.end();
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+ }
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+
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+ static bgfx::VertexDecl ms_decl;
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+};
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+
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+bgfx::VertexDecl PosColorVertex::ms_decl;
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+
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+struct PosColorTexCoord0Vertex
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+{
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+ float m_x;
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+ float m_y;
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+ float m_z;
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+ uint32_t m_rgba;
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+ float m_u;
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+ float m_v;
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+
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+ static void init()
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+ {
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+ ms_decl.begin();
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+ ms_decl.add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float);
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+ ms_decl.add(bgfx::Attrib::Color0, 4, bgfx::AttribType::Uint8, true);
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+ ms_decl.add(bgfx::Attrib::TexCoord0, 2, bgfx::AttribType::Float);
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+ ms_decl.end();
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+ }
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+
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+ static bgfx::VertexDecl ms_decl;
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+};
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+
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+bgfx::VertexDecl PosColorTexCoord0Vertex::ms_decl;
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+
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+static PosColorVertex s_cubeVertices[8] =
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+{
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+ {-1.0f, 1.0f, 1.0f, 0xff000000 },
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+ { 1.0f, 1.0f, 1.0f, 0xff0000ff },
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+ {-1.0f, -1.0f, 1.0f, 0xff00ff00 },
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+ { 1.0f, -1.0f, 1.0f, 0xff00ffff },
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+ {-1.0f, 1.0f, -1.0f, 0xffff0000 },
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+ { 1.0f, 1.0f, -1.0f, 0xffff00ff },
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+ {-1.0f, -1.0f, -1.0f, 0xffffff00 },
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+ { 1.0f, -1.0f, -1.0f, 0xffffffff },
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+};
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+
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+static const uint16_t s_cubeIndices[36] =
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+{
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+ 0, 1, 2, // 0
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+ 1, 3, 2,
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+ 4, 6, 5, // 2
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+ 5, 6, 7,
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+ 0, 2, 4, // 4
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+ 4, 2, 6,
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+ 1, 5, 3, // 6
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+ 5, 7, 3,
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+ 0, 4, 1, // 8
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+ 4, 5, 1,
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+ 2, 3, 6, // 10
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+ 6, 3, 7,
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+};
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+
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+static const char* s_shaderPath = NULL;
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+
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+static void shaderFilePath(char* _out, const char* _name)
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+{
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+ strcpy(_out, s_shaderPath);
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+ strcat(_out, _name);
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+ strcat(_out, ".bin");
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+}
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+
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+long int fsize(FILE* _file)
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+{
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+ long int pos = ftell(_file);
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+ fseek(_file, 0L, SEEK_END);
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+ long int size = ftell(_file);
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+ fseek(_file, pos, SEEK_SET);
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+ return size;
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+}
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+
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+static const bgfx::Memory* load(const char* _filePath)
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+{
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+ FILE* file = fopen(_filePath, "rb");
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+ if (NULL != file)
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+ {
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+ uint32_t size = (uint32_t)fsize(file);
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+ const bgfx::Memory* mem = bgfx::alloc(size+1);
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+ size_t ignore = fread(mem->data, 1, size, file);
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+ BX_UNUSED(ignore);
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+ fclose(file);
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+ mem->data[mem->size-1] = '\0';
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+ return mem;
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+ }
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+
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+ return NULL;
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+}
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+
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+static const bgfx::Memory* loadShader(const char* _name)
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+{
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+ char filePath[512];
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+ shaderFilePath(filePath, _name);
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+ return load(filePath);
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+}
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+
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+static bgfx::ProgramHandle loadProgram(const char* _vshName, const char* _fshName)
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+{
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+ const bgfx::Memory* mem;
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+
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+ mem = loadShader(_vshName);
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+ bgfx::VertexShaderHandle vsh = bgfx::createVertexShader(mem);
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+
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+ mem = loadShader(_fshName);
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+ bgfx::FragmentShaderHandle fsh = bgfx::createFragmentShader(mem);
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+
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+ return bgfx::createProgram(vsh, fsh, true);
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+}
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+
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+static float s_texelHalf = 0.0f;
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+static bool s_flipV = false;
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+
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+void screenSpaceQuad(float _textureWidth, float _textureHeight, bool _originBottomLeft = false, float _width = 1.0f, float _height = 1.0f)
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+{
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+ if (bgfx::checkAvailTransientVertexBuffer(3, PosColorTexCoord0Vertex::ms_decl) )
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+ {
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+ bgfx::TransientVertexBuffer vb;
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+ bgfx::allocTransientVertexBuffer(&vb, 3, PosColorTexCoord0Vertex::ms_decl);
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+ PosColorTexCoord0Vertex* vertex = (PosColorTexCoord0Vertex*)vb.data;
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+
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+ const float zz = 0.0f;
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+
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+ const float minx = -_width;
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+ const float maxx = _width;
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+ const float miny = 0.0f;
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+ const float maxy = _height*2.0f;
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+
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+ const float texelHalfW = s_texelHalf/_textureWidth;
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+ const float texelHalfH = s_texelHalf/_textureHeight;
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+ const float minu = -1.0f + texelHalfW;
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+ const float maxu = 1.0f + texelHalfW;
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+
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+ float minv = texelHalfH;
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+ float maxv = 2.0f + texelHalfH;
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+
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+ if (_originBottomLeft)
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+ {
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+ float tmp = minv;
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+ minv = maxv;
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+ maxv = tmp;
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+
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+ minv -= 1.0f;
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+ maxv -= 1.0f;
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+ }
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+
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+ vertex[0].m_x = minx;
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+ vertex[0].m_y = miny;
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+ vertex[0].m_z = zz;
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+ vertex[0].m_rgba = 0xffffffff;
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+ vertex[0].m_u = minu;
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+ vertex[0].m_v = minv;
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+
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+ vertex[1].m_x = maxx;
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+ vertex[1].m_y = miny;
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+ vertex[1].m_z = zz;
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+ vertex[1].m_rgba = 0xffffffff;
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+ vertex[1].m_u = maxu;
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+ vertex[1].m_v = minv;
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+
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+ vertex[2].m_x = maxx;
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+ vertex[2].m_y = maxy;
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+ vertex[2].m_z = zz;
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+ vertex[2].m_rgba = 0xffffffff;
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+ vertex[2].m_u = maxu;
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+ vertex[2].m_v = maxv;
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+
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+ bgfx::setVertexBuffer(&vb);
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+ }
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+}
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+
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+int _main_(int /*_argc*/, char** /*_argv*/)
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+{
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+ // Create vertex stream declaration.
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+ PosColorVertex::init();
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+ PosColorTexCoord0Vertex::init();
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+
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+ uint32_t width = 1280;
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+ uint32_t height = 720;
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+ uint32_t debug = BGFX_DEBUG_TEXT;
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+ uint32_t reset = BGFX_RESET_VSYNC;
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+
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+ bgfx::init();
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+ bgfx::reset(width, height, reset);
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+
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+ // Enable debug text.
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+ bgfx::setDebug(debug);
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+
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+ // Get renderer capabilities info.
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+ const bgfx::Caps* caps = bgfx::getCaps();
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+
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+ // Setup root path for binary shaders. Shader binaries are different
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+ // for each renderer.
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+ switch (caps->rendererType)
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+ {
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+ default:
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+ case bgfx::RendererType::Direct3D9:
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+ s_shaderPath = "shaders/dx9/";
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+ s_texelHalf = 0.5f;
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+ break;
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+
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+ case bgfx::RendererType::Direct3D11:
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+ s_shaderPath = "shaders/dx11/";
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+ break;
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+
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+ case bgfx::RendererType::OpenGL:
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+ s_shaderPath = "shaders/glsl/";
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+ s_flipV = true;
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+ break;
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+
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+ case bgfx::RendererType::OpenGLES2:
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+ case bgfx::RendererType::OpenGLES3:
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+ s_shaderPath = "shaders/gles/";
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+ s_flipV = true;
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+ break;
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+ }
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+
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+ // Imgui.
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+ FILE* file = fopen("font/droidsans.ttf", "rb");
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+ uint32_t size = (uint32_t)fsize(file);
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+ void* data = malloc(size);
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+ size_t ignore = fread(data, 1, size, file);
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+ BX_UNUSED(ignore);
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+ fclose(file);
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+ imguiCreate(data, size);
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+
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+ const bgfx::Memory* mem;
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+
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+ // Create static vertex buffer.
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+ mem = bgfx::makeRef(s_cubeVertices, sizeof(s_cubeVertices) );
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+ bgfx::VertexBufferHandle vbh = bgfx::createVertexBuffer(mem, PosColorVertex::ms_decl);
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+
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+ // Create static index buffer.
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+ mem = bgfx::makeRef(s_cubeIndices, sizeof(s_cubeIndices) );
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+ bgfx::IndexBufferHandle ibh = bgfx::createIndexBuffer(mem);
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+
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+ // Create texture sampler uniforms.
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+ bgfx::UniformHandle u_texColor0 = bgfx::createUniform("u_texColor0", bgfx::UniformType::Uniform1iv);
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+ bgfx::UniformHandle u_texColor1 = bgfx::createUniform("u_texColor1", bgfx::UniformType::Uniform1iv);
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+ bgfx::UniformHandle u_color = bgfx::createUniform("u_color", bgfx::UniformType::Uniform4fv);
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+
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+ bgfx::ProgramHandle blend = loadProgram("vs_oit", "fs_oit" );
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+ bgfx::ProgramHandle wbSeparatePass = loadProgram("vs_oit", "fs_oit_wb_separate" );
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+ bgfx::ProgramHandle wbSeparateBlit = loadProgram("vs_oit_blit", "fs_oit_wb_separate_blit" );
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+ bgfx::ProgramHandle wbPass = loadProgram("vs_oit", "fs_oit_wb" );
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+ bgfx::ProgramHandle wbBlit = loadProgram("vs_oit_blit", "fs_oit_wb_blit" );
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+
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+ bgfx::TextureHandle fbtextures[] =
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+ {
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+ bgfx::createTexture2D(width, height, 1, bgfx::TextureFormat::RGBA16F, BGFX_TEXTURE_RT),
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+ bgfx::createTexture2D(width, height, 1, bgfx::TextureFormat::R16F, BGFX_TEXTURE_RT),
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+ bgfx::createTexture2D(width, height, 1, bgfx::TextureFormat::D16, BGFX_TEXTURE_RT_BUFFER_ONLY),
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+ };
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+ bgfx::FrameBufferHandle fbh = bgfx::createFrameBuffer(BX_COUNTOF(fbtextures), fbtextures, true);
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+
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+ int64_t timeOffset = bx::getHPCounter();
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+
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+ uint32_t mode = 1;
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+ int32_t scrollArea = 0;
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+ bool frontToBack = true;
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+ bool fadeInOut = false;
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+
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+ entry::MouseState mouseState;
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+ while (!entry::processEvents(width, height, debug, reset, &mouseState) )
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+ {
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+ imguiBeginFrame(mouseState.m_mx
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+ , mouseState.m_my
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+ , (mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
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+ | (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
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+ , 0
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+ , width
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+ , height
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+ );
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+
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+ imguiBeginScrollArea("Settings", width - width / 4 - 10, 10, width / 4, height / 3, &scrollArea);
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+ imguiSeparatorLine();
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+
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+ imguiLabel("Blend mode:");
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+
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+ mode = imguiChoose(mode
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+ , "None"
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+ , "Separate"
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+ , "MRT Independent"
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+ );
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+
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+ imguiSeparatorLine();
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+
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+ if (imguiCheck("Front to back", frontToBack) )
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+ {
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+ frontToBack ^= true;
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+ }
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+
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+ if (imguiCheck("Fade in/out", fadeInOut) )
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+ {
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+ fadeInOut ^= true;
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+ }
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+
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+ imguiEndScrollArea();
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+ imguiEndFrame();
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+
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+ // Set view 0 default viewport.
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+ bgfx::setViewRectMask(0x3, 0, 0, width, height);
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+
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+ int64_t now = bx::getHPCounter();
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+ static int64_t last = now;
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+ const int64_t frameTime = now - last;
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+ last = now;
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+ const double freq = double(bx::getHPFrequency() );
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+ const double toMs = 1000.0/freq;
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+
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+ float time = (float)( (now-timeOffset)/freq);
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+
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+ // Use debug font to print information about this example.
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+ bgfx::dbgTextClear();
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+ // Reference:
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+ // Weighted, Blended Order-Independent Transparency
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+ // http://jcgt.org/published/0002/02/09/
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+ // http://casual-effects.blogspot.com/2014/03/weighted-blended-order-independent.html
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+ bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/19-oit");
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+ bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Weighted, Blended Order Independent Transparency.");
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+ bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);
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+
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+ float at[3] = { 0.0f, 0.0f, 0.0f };
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+ float eye[3] = { 0.0f, 0.0f, -7.0f };
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+
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+ float view[16];
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+ float proj[16];
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+
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+ // Set view and projection matrix for view 0.
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+ mtxLookAt(view, eye, at);
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+ mtxProj(proj, 60.0f, float(width)/float(height), 0.1f, 100.0f);
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+
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+ bgfx::setViewTransform(0, view, proj);
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+
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+ bgfx::setViewClearMask(0x3
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+ , BGFX_CLEAR_COLOR_BIT|BGFX_CLEAR_DEPTH_BIT
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+ , 0x00000000
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+ , 1.0f
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+ , 0
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+ );
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+
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+ bgfx::FrameBufferHandle invalid = BGFX_INVALID_HANDLE;
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+ bgfx::setViewFrameBuffer(0, 0 == mode ? invalid : fbh);
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+
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+ // Set view and projection matrix for view 1.
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+ mtxIdentity(view);
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+ mtxOrtho(proj, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 100.0f);
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+ bgfx::setViewTransform(1, view, proj);
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+
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+ for (uint32_t depth = 0; depth < 3; ++depth)
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+ {
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+ uint32_t zz = frontToBack ? 2-depth : depth;
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+
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+ for (uint32_t yy = 0; yy < 3; ++yy)
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+ {
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+ for (uint32_t xx = 0; xx < 3; ++xx)
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+ {
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+ float color[4] = { xx*1.0f/3.0f, zz*1.0f/3.0f, yy*1.0f/3.0f, 0.5f };
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+
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+ if (fadeInOut
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+ && zz == 1)
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|
+ {
|
|
|
+ color[3] = sinf(time*3.0f)*0.49f+0.5f;
|
|
|
+ }
|
|
|
+
|
|
|
+ bgfx::setUniform(u_color, color);
|
|
|
+
|
|
|
+ BX_UNUSED(time);
|
|
|
+ float mtx[16];
|
|
|
+ mtxRotateXY(mtx, time*0.023f + xx*0.21f, time*0.03f + yy*0.37f);
|
|
|
+ //mtxIdentity(mtx);
|
|
|
+ mtx[12] = -2.5f + float(xx)*2.5f;
|
|
|
+ mtx[13] = -2.5f + float(yy)*2.5f;
|
|
|
+ mtx[14] = -2.5f + float(zz)*2.5f; //0.0f; // sinf(time + ( (xx+1)*(yy+1)/9.0f)*float(M_PI) )*50.0f+50.0f; //90.0f - (xx+1)*(yy+1)*10.0f;
|
|
|
+
|
|
|
+ // Set transform for draw call.
|
|
|
+ bgfx::setTransform(mtx);
|
|
|
+
|
|
|
+ // Set vertex and index buffer.
|
|
|
+ bgfx::setVertexBuffer(vbh);
|
|
|
+ bgfx::setIndexBuffer(ibh);
|
|
|
+
|
|
|
+ const uint64_t state = 0
|
|
|
+ | BGFX_STATE_CULL_CW
|
|
|
+ | BGFX_STATE_RGB_WRITE
|
|
|
+ | BGFX_STATE_ALPHA_WRITE
|
|
|
+ | BGFX_STATE_DEPTH_TEST_LESS
|
|
|
+ | BGFX_STATE_MSAA
|
|
|
+ ;
|
|
|
+
|
|
|
+ switch (mode)
|
|
|
+ {
|
|
|
+ case 0:
|
|
|
+ // Set vertex and fragment shaders.
|
|
|
+ bgfx::setProgram(blend);
|
|
|
+
|
|
|
+ // Set render states.
|
|
|
+ bgfx::setState(state
|
|
|
+ | BGFX_STATE_BLEND_ALPHA
|
|
|
+ );
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 1:
|
|
|
+ // Set vertex and fragment shaders.
|
|
|
+ bgfx::setProgram(wbSeparatePass);
|
|
|
+
|
|
|
+ // Set render states.
|
|
|
+ bgfx::setState(state
|
|
|
+ | BGFX_STATE_BLEND_FUNC_SEPARATE(BGFX_STATE_BLEND_ONE, BGFX_STATE_BLEND_ONE, BGFX_STATE_BLEND_ZERO, BGFX_STATE_BLEND_INV_SRC_ALPHA)
|
|
|
+ );
|
|
|
+ break;
|
|
|
+
|
|
|
+ default:
|
|
|
+ // Set vertex and fragment shaders.
|
|
|
+ bgfx::setProgram(wbPass);
|
|
|
+
|
|
|
+ // Set render states.
|
|
|
+ bgfx::setState(state
|
|
|
+ | BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_ONE, BGFX_STATE_BLEND_ONE)
|
|
|
+ | BGFX_STATE_BLEND_INDEPENDENT
|
|
|
+ , 0
|
|
|
+ | BGFX_STATE_BLEND_FUNC_RT_1(BGFX_STATE_BLEND_ZERO, BGFX_STATE_BLEND_SRC_COLOR)
|
|
|
+ );
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Submit primitive for rendering to view 0.
|
|
|
+ bgfx::submit(0);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (0 != mode)
|
|
|
+ {
|
|
|
+ bgfx::setTexture(0, u_texColor0, fbtextures[0]);
|
|
|
+ bgfx::setTexture(1, u_texColor1, fbtextures[1]);
|
|
|
+ bgfx::setProgram(1 == mode ? wbSeparateBlit : wbBlit);
|
|
|
+ bgfx::setState(0
|
|
|
+ | BGFX_STATE_RGB_WRITE
|
|
|
+ | BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_INV_SRC_ALPHA, BGFX_STATE_BLEND_SRC_ALPHA)
|
|
|
+ );
|
|
|
+ screenSpaceQuad( (float)width, (float)height, s_flipV);
|
|
|
+ bgfx::submit(1);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Advance to next frame. Rendering thread will be kicked to
|
|
|
+ // process submitted rendering primitives.
|
|
|
+ bgfx::frame();
|
|
|
+ }
|
|
|
+
|
|
|
+ // Cleanup.
|
|
|
+ bgfx::destroyFrameBuffer(fbh);
|
|
|
+ bgfx::destroyIndexBuffer(ibh);
|
|
|
+ bgfx::destroyVertexBuffer(vbh);
|
|
|
+ bgfx::destroyProgram(blend);
|
|
|
+ bgfx::destroyProgram(wbSeparatePass);
|
|
|
+ bgfx::destroyProgram(wbSeparateBlit);
|
|
|
+ bgfx::destroyProgram(wbPass);
|
|
|
+ bgfx::destroyProgram(wbBlit);
|
|
|
+ bgfx::destroyUniform(u_texColor0);
|
|
|
+ bgfx::destroyUniform(u_texColor1);
|
|
|
+ bgfx::destroyUniform(u_color);
|
|
|
+
|
|
|
+ // Shutdown bgfx.
|
|
|
+ bgfx::shutdown();
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
Branimir Karadžić
