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@@ -0,0 +1,486 @@
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+/*
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+ * Copyright 2015 Andrew Mac. 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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+#include "bgfx_utils.h"
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+#include "imgui/imgui.h"
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+#include "camera.h"
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+#include "bounds.h"
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+#include "bx/fpumath.h"
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+#include <bx/debug.h>
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+
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+static float s_texelHalf = 0.0f;
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+static bool s_originBottomLeft = false;
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+static uint32_t s_terrainSize = 256;
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+
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+struct PosTexCoord0Vertex
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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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+ 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
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+ .begin()
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+ .add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float)
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+ .add(bgfx::Attrib::TexCoord0, 2, bgfx::AttribType::Float)
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+ .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 PosTexCoord0Vertex::ms_decl;
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+
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+struct TerrainData
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+{
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+ uint32_t m_mode;
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+ bool m_dirty;
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+ float m_transform[16];
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+ uint8_t* m_heightMap;
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+
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+ PosTexCoord0Vertex* m_vertices;
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+ uint32_t m_vertexCount;
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+ uint16_t* m_indices;
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+ uint32_t m_indexCount;
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+};
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+
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+struct BrushData
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+{
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+ bool m_raise;
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+ int32_t m_size;
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+ float m_power;
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+};
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+
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+class Terrain : public entry::AppI
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+{
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+ void init(int _argc, char** _argv) BX_OVERRIDE
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+ {
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+ Args args(_argc, _argv);
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+
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+ m_width = 1280;
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+ m_height = 720;
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+ m_debug = BGFX_DEBUG_TEXT;
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+ m_reset = BGFX_RESET_VSYNC;
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+
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+ bgfx::init(bgfx::RendererType::Direct3D11, args.m_pciId);
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+ bgfx::reset(m_width, m_height, m_reset);
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+
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+ // Enable m_debug text.
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+ bgfx::setDebug(m_debug);
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+
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+ // Set view 0 clear state.
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+ bgfx::setViewClear(0
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+ , BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH
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+ , 0x303030ff
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+ , 1.0f
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+ , 0
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+ );
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+
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+ // Create vertex stream declaration.
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+ PosTexCoord0Vertex::init();
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+
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+ // Create program from shaders.
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+ m_terrainProgram = loadProgram("vs_terrain", "fs_terrain");
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+ m_terrainHeightTextureProgram = loadProgram("vs_terrain_height_texture", "fs_terrain");
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+
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+ // Imgui.
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+ imguiCreate();
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+
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+ m_timeOffset = bx::getHPCounter();
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+ const bgfx::RendererType::Enum renderer = bgfx::getRendererType();
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+ s_texelHalf = bgfx::RendererType::Direct3D9 == renderer ? 0.5f : 0.0f;
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+ s_originBottomLeft = bgfx::RendererType::OpenGL == renderer || bgfx::RendererType::OpenGLES == renderer;
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+
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+ m_vbh.idx = bgfx::invalidHandle;
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+ m_ibh.idx = bgfx::invalidHandle;
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+ m_dvbh.idx = bgfx::invalidHandle;
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+ m_dibh.idx = bgfx::invalidHandle;
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+ m_heightTexture.idx = bgfx::invalidHandle;
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+ s_heightTexture = bgfx::createUniform("s_heightTexture", bgfx::UniformType::Int1);
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+
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+ m_oldWidth = 0;
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+ m_oldHeight = 0;
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+ m_oldReset = m_reset;
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+
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+ m_scrollArea = 0;
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+
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+ m_brush.m_power = 0.5f;
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+ m_brush.m_size = 10;
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+ m_brush.m_raise = true;
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+
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+ m_terrain.m_mode = 0;
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+ m_terrain.m_dirty = true;
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+ m_terrain.m_vertices = new PosTexCoord0Vertex[s_terrainSize * s_terrainSize];
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+ m_terrain.m_indices = new uint16_t[s_terrainSize * s_terrainSize * 6];
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+ m_terrain.m_heightMap = new uint8_t[s_terrainSize * s_terrainSize];
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+
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+ bx::mtxSRT(m_terrain.m_transform, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
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+ memset(m_terrain.m_heightMap, 0, sizeof(uint8_t) * s_terrainSize * s_terrainSize);
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+
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+ cameraCreate();
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+
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+ const float initialPos[3] = { 0.0f, 15.0f, 0.0f };
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+ cameraSetPosition(initialPos);
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+ cameraSetVerticalAngle(0.0f);
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+ }
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+
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+ virtual int shutdown() BX_OVERRIDE
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+ {
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+ // Cleanup.
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+ cameraDestroy();
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+ imguiDestroy();
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+
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+ if (bgfx::isValid(m_ibh))
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+ bgfx::destroyIndexBuffer(m_ibh);
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+ if (bgfx::isValid(m_vbh))
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+ bgfx::destroyVertexBuffer(m_vbh);
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+
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+ if (bgfx::isValid(m_dibh))
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+ bgfx::destroyDynamicIndexBuffer(m_dibh);
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+ if (bgfx::isValid(m_dvbh))
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+ bgfx::destroyDynamicVertexBuffer(m_dvbh);
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+
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+ bgfx::destroyUniform(s_heightTexture);
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+ if (bgfx::isValid(m_heightTexture))
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+ bgfx::destroyTexture(m_heightTexture);
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+
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+ bgfx::destroyProgram(m_terrainProgram);
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+ bgfx::destroyProgram(m_terrainHeightTextureProgram);
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+
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+ delete[] m_terrain.m_vertices;
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+ delete[] m_terrain.m_indices;
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+ delete[] m_terrain.m_heightMap;
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+
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+ // Shutdown bgfx.
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+ bgfx::shutdown();
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+
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+ return 0;
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+ }
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+
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+ void updateTerrainMesh()
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+ {
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+ m_terrain.m_vertexCount = 0;
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+ for (uint32_t y = 0; y < s_terrainSize; y++)
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+ {
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+ for (uint32_t x = 0; x < s_terrainSize; x++)
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+ {
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+ PosTexCoord0Vertex* vert = &m_terrain.m_vertices[m_terrain.m_vertexCount];
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+ vert->m_x = (float)x;
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+ vert->m_y = m_terrain.m_heightMap[(y * s_terrainSize) + x];
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+ vert->m_z = (float)y;
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+ vert->m_u = (float)x / (float)s_terrainSize;
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+ vert->m_v = (float)y / (float)s_terrainSize;
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+
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+ m_terrain.m_vertexCount++;
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+ }
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+ }
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+
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+ m_terrain.m_indexCount = 0;
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+ for (uint32_t y = 0; y < (s_terrainSize - 1); y++)
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+ {
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+ uint32_t y_offset = (y * s_terrainSize);
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+ for (uint32_t x = 0; x < (s_terrainSize - 1); x++)
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+ {
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+ m_terrain.m_indices[m_terrain.m_indexCount] = y_offset + x + 1;
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+ m_terrain.m_indices[m_terrain.m_indexCount + 1] = y_offset + x + s_terrainSize;
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+ m_terrain.m_indices[m_terrain.m_indexCount + 2] = y_offset + x;
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+ m_terrain.m_indices[m_terrain.m_indexCount + 3] = y_offset + x + s_terrainSize + 1;
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+ m_terrain.m_indices[m_terrain.m_indexCount + 4] = y_offset + x + s_terrainSize;
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+ m_terrain.m_indices[m_terrain.m_indexCount + 5] = y_offset + x + 1;
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+
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+ m_terrain.m_indexCount += 6;
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+ }
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+ }
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+ }
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+
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+ void updateTerrain()
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+ {
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+ const bgfx::Memory* mem;
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+
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+ // Vertex Buffer : Destroy and recreate a regular vertex buffer to update terrain.
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+ if (m_terrain.m_mode == 0)
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+ {
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+ updateTerrainMesh();
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+
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+ if (bgfx::isValid(m_vbh))
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+ bgfx::destroyVertexBuffer(m_vbh);
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+
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+ mem = bgfx::makeRef(&m_terrain.m_vertices[0], sizeof(PosTexCoord0Vertex) * m_terrain.m_vertexCount);
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+ m_vbh = bgfx::createVertexBuffer(mem, PosTexCoord0Vertex::ms_decl);
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+
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+ if (bgfx::isValid(m_ibh))
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+ bgfx::destroyIndexBuffer(m_ibh);
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+
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+ mem = bgfx::makeRef(&m_terrain.m_indices[0], sizeof(uint16_t) * m_terrain.m_indexCount);
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+ m_ibh = bgfx::createIndexBuffer(mem);
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+ }
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+
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+ // Dynamic Vertex Buffer : Utilize dynamic vertex buffer to update terrain.
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+ if (m_terrain.m_mode == 1)
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+ {
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+ updateTerrainMesh();
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+
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+ if (!bgfx::isValid(m_dvbh))
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+ m_dvbh = bgfx::createDynamicVertexBuffer(m_terrain.m_vertexCount, PosTexCoord0Vertex::ms_decl);
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+
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+ mem = bgfx::makeRef(&m_terrain.m_vertices[0], sizeof(PosTexCoord0Vertex) * m_terrain.m_vertexCount);
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+ bgfx::updateDynamicVertexBuffer(m_dvbh, 0, mem);
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+
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+ if (!bgfx::isValid(m_dibh))
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+ m_dibh = bgfx::createDynamicIndexBuffer(m_terrain.m_indexCount);
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+
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+ mem = bgfx::makeRef(&m_terrain.m_indices[0], sizeof(uint16_t) * m_terrain.m_indexCount);
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+ bgfx::updateDynamicIndexBuffer(m_dibh, 0, mem);
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+ }
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+
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+ // Height Texture: Update a height texture that is sampled in the terrain vertex shader.
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+ if (m_terrain.m_mode == 2)
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+ {
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+ if (!bgfx::isValid(m_vbh) || !bgfx::isValid(m_ibh))
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+ {
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+ updateTerrainMesh();
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+
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+ mem = bgfx::makeRef(&m_terrain.m_vertices[0], sizeof(PosTexCoord0Vertex) * m_terrain.m_vertexCount);
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+ m_vbh = bgfx::createVertexBuffer(mem, PosTexCoord0Vertex::ms_decl);
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+
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+ mem = bgfx::makeRef(&m_terrain.m_indices[0], sizeof(uint16_t) * m_terrain.m_indexCount);
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+ m_ibh = bgfx::createIndexBuffer(mem);
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+ }
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+
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+ if (!bgfx::isValid(m_heightTexture))
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+ m_heightTexture = bgfx::createTexture2D(s_terrainSize, s_terrainSize, 1, bgfx::TextureFormat::R8);
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+
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+ mem = bgfx::makeRef(&m_terrain.m_heightMap[0], sizeof(uint8_t) * s_terrainSize * s_terrainSize);
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+ bgfx::updateTexture2D(m_heightTexture, 0, 0, 0, s_terrainSize, s_terrainSize, mem);
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+ }
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+ }
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+
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+ void paintTerrainHeight(uint32_t _x, uint32_t _y)
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+ {
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+ for (int32_t area_y = -m_brush.m_size; area_y < m_brush.m_size; ++area_y)
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+ {
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+ for (int32_t area_x = -m_brush.m_size; area_x < m_brush.m_size; ++area_x)
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+ {
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+ int32_t brush_x = _x + area_x;
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+ if (brush_x < 0 || brush_x > (int32_t)s_terrainSize) continue;
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+ int32_t brush_y = _y + area_y;
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+ if (brush_y < 0 || brush_y > (int32_t)s_terrainSize) continue;
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+
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+ uint32_t heightMapPos = (brush_y * s_terrainSize) + brush_x;
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+ float height = (float)m_terrain.m_heightMap[heightMapPos];
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+
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+ // Brush attenuation
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+ float a2 = (float)(area_x * area_x);
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+ float b2 = (float)(area_y * area_y);
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+ float brushAttn = m_brush.m_size - sqrtf(a2 + b2);
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+
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+ // Raise/Lower and scale by brush power.
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+ height += bx::fclamp(brushAttn * m_brush.m_power, 0.0, m_brush.m_power) * m_brush.m_raise ? 1.0 : -1.0;
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+
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+ m_terrain.m_heightMap[heightMapPos] = (uint8_t)bx::fclamp(height, 0.0, 255.0);
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+ m_terrain.m_dirty = true;
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+ }
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+ }
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+ }
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+
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+ void mousePickTerrain()
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+ {
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+ float ray_clip[4];
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+ ray_clip[0] = ((2.0f * m_mouseState.m_mx) / m_width - 1.0f) * -1.0f;
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+ ray_clip[1] = ((1.0f - (2.0f * m_mouseState.m_my) / m_height)) * -1.0f;
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+ ray_clip[2] = -1.0;
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+ ray_clip[3] = 1.0;
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+
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+ float invProjMtx[16];
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+ bx::mtxInverse(invProjMtx, m_projMtx);
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+
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+ float ray_eye[4];
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+ bx::vec4MulMtx(ray_eye, ray_clip, invProjMtx);
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+ ray_eye[2] = -1.0f;
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+ ray_eye[3] = 0.0f;
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+
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+ float invViewMtx[16];
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+ bx::mtxInverse(invViewMtx, m_viewMtx);
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+
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+ float ray_world[4];
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+ bx::vec4MulMtx(ray_world, ray_eye, invViewMtx);
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+
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+ float ray_dir[3];
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+ bx::vec3Norm(ray_dir, ray_world);
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+ ray_dir[0] *= -1.0;
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+ ray_dir[1] *= -1.0;
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+ ray_dir[2] *= -1.0;
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+
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+ float pos[3];
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+ cameraGetPosition(pos);
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+ for (int i = 0; i < 1000; ++i)
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+ {
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+ bx::vec3Add(pos, pos, ray_dir);
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+
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+ if (pos[0] < 0 || pos[0] > s_terrainSize || pos[2] < 0 || pos[2] > s_terrainSize)
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+ continue;
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+
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+ uint32_t heightMapPos = ((uint32_t)pos[2] * s_terrainSize) + (uint32_t)pos[0];
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+ if ( pos[1] < m_terrain.m_heightMap[heightMapPos] )
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+ {
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+ paintTerrainHeight((uint32_t)pos[0], (uint32_t)pos[2]);
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+ return;
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+ }
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+ }
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+ }
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+
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+ bool update() BX_OVERRIDE
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+ {
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+ if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &m_mouseState) )
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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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+ const float deltaTime = float(frameTime/freq);
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+
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+ // Use m_debug font to print information about this example.
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+ bgfx::dbgTextClear();
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+ bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/27-terrain");
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+ bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Terrain painting example.");
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+ bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);
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+
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+ imguiBeginFrame(m_mouseState.m_mx
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+ , m_mouseState.m_my
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+ , (m_mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
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+ | (m_mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
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+ | (m_mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
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+ , m_mouseState.m_mz
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+ , m_width
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+ , m_height
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+ );
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+
|
|
|
+ imguiBeginScrollArea("Settings", m_width - m_width / 5 - 10, 10, m_width / 5, m_height / 3, &m_scrollArea);
|
|
|
+ imguiSeparatorLine();
|
|
|
+
|
|
|
+ if (imguiCheck("Vertex Buffer", (m_terrain.m_mode == 0)) )
|
|
|
+ {
|
|
|
+ m_terrain.m_mode = 0;
|
|
|
+ m_terrain.m_dirty = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (imguiCheck("Dynamic Vertex Buffer", (m_terrain.m_mode == 1)) )
|
|
|
+ {
|
|
|
+ m_terrain.m_mode = 1;
|
|
|
+ m_terrain.m_dirty = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (imguiCheck("Height Texture", (m_terrain.m_mode == 2)) )
|
|
|
+ {
|
|
|
+ m_terrain.m_mode = 2;
|
|
|
+ m_terrain.m_dirty = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ imguiSeparatorLine();
|
|
|
+
|
|
|
+ if (imguiCheck("Raise Terrain", m_brush.m_raise))
|
|
|
+ {
|
|
|
+ m_brush.m_raise = !m_brush.m_raise;
|
|
|
+ }
|
|
|
+
|
|
|
+ imguiSlider("Brush Size", m_brush.m_size, 1, 50);
|
|
|
+ imguiSlider("Brush Power", m_brush.m_power, 0.0f, 1.0f, 0.01f);
|
|
|
+
|
|
|
+ imguiEndScrollArea();
|
|
|
+ imguiEndFrame();
|
|
|
+
|
|
|
+ // Update camera.
|
|
|
+ cameraUpdate(deltaTime, m_mouseState);
|
|
|
+
|
|
|
+ bool leftMouseButtonDown = !!m_mouseState.m_buttons[entry::MouseButton::Left];
|
|
|
+ if (leftMouseButtonDown)
|
|
|
+ {
|
|
|
+ mousePickTerrain();
|
|
|
+ }
|
|
|
+
|
|
|
+ // Update terrain.
|
|
|
+ if (m_terrain.m_dirty)
|
|
|
+ {
|
|
|
+ updateTerrain();
|
|
|
+ m_terrain.m_dirty = false;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Set view 0 default viewport.
|
|
|
+ bgfx::setViewRect(0, 0, 0, m_width, m_height);
|
|
|
+
|
|
|
+ cameraGetViewMtx(m_viewMtx);
|
|
|
+ bx::mtxProj(m_projMtx, 60.0f, float(m_width) / float(m_height), 0.1f, 2000.0f, s_originBottomLeft);
|
|
|
+
|
|
|
+ bgfx::setViewTransform(0, m_viewMtx, m_projMtx);
|
|
|
+ bgfx::setTransform(m_terrain.m_transform);
|
|
|
+
|
|
|
+ if (m_terrain.m_mode == 0)
|
|
|
+ {
|
|
|
+ bgfx::setVertexBuffer(m_vbh);
|
|
|
+ bgfx::setIndexBuffer(m_ibh);
|
|
|
+ bgfx::submit(0, m_terrainProgram);
|
|
|
+ }
|
|
|
+ else if (m_terrain.m_mode == 1)
|
|
|
+ {
|
|
|
+ bgfx::setVertexBuffer(m_dvbh);
|
|
|
+ bgfx::setIndexBuffer(m_dibh);
|
|
|
+ bgfx::submit(0, m_terrainProgram);
|
|
|
+ }
|
|
|
+ else if (m_terrain.m_mode == 2)
|
|
|
+ {
|
|
|
+ bgfx::setVertexBuffer(m_vbh);
|
|
|
+ bgfx::setIndexBuffer(m_ibh);
|
|
|
+ bgfx::setTexture(0, s_heightTexture, m_heightTexture);
|
|
|
+ bgfx::submit(0, m_terrainHeightTextureProgram);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Advance to next frame. Rendering thread will be kicked to
|
|
|
+ // process submitted rendering primitives.
|
|
|
+ bgfx::frame();
|
|
|
+
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ bgfx::VertexBufferHandle m_vbh;
|
|
|
+ bgfx::IndexBufferHandle m_ibh;
|
|
|
+ bgfx::DynamicVertexBufferHandle m_dvbh;
|
|
|
+ bgfx::DynamicIndexBufferHandle m_dibh;
|
|
|
+ bgfx::ProgramHandle m_terrainProgram;
|
|
|
+ bgfx::ProgramHandle m_terrainHeightTextureProgram;
|
|
|
+ bgfx::UniformHandle s_heightTexture;
|
|
|
+ bgfx::TextureHandle m_heightTexture;
|
|
|
+
|
|
|
+ float m_viewMtx[16];
|
|
|
+ float m_projMtx[16];
|
|
|
+
|
|
|
+ uint32_t m_width;
|
|
|
+ uint32_t m_height;
|
|
|
+ uint32_t m_debug;
|
|
|
+ uint32_t m_reset;
|
|
|
+
|
|
|
+ uint32_t m_oldWidth;
|
|
|
+ uint32_t m_oldHeight;
|
|
|
+ uint32_t m_oldReset;
|
|
|
+
|
|
|
+ int32_t m_scrollArea;
|
|
|
+
|
|
|
+ TerrainData m_terrain;
|
|
|
+ BrushData m_brush;
|
|
|
+
|
|
|
+ entry::MouseState m_mouseState;
|
|
|
+
|
|
|
+ int64_t m_timeOffset;
|
|
|
+};
|
|
|
+
|
|
|
+ENTRY_IMPLEMENT_MAIN(Terrain);
|
Branimir Karadžić
