mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-11-28 18:45:54 -05:00
558 lines
16 KiB
C++
558 lines
16 KiB
C++
/*
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* Copyright 2011-2015 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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#include "common.h"
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#include "bgfx_utils.h"
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#include "imgui/imgui.h"
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static float s_texelHalf = 0.0f;
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static bool s_originBottomLeft = false;
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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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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::Color0, 4, bgfx::AttribType::Uint8, true)
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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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static bgfx::VertexDecl ms_decl;
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};
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bgfx::VertexDecl PosColorTexCoord0Vertex::ms_decl;
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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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const float zz = 0.0f;
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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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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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float minv = texelHalfH;
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float maxv = 2.0f + texelHalfH;
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if (_originBottomLeft)
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{
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float temp = minv;
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minv = maxv;
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maxv = temp;
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minv -= 1.0f;
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maxv -= 1.0f;
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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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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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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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bgfx::setVertexBuffer(&vb);
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}
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}
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void setOffsets2x2Lum(bgfx::UniformHandle _handle, uint32_t _width, uint32_t _height)
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{
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float offsets[16][4];
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float du = 1.0f/_width;
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float dv = 1.0f/_height;
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uint32_t num = 0;
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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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offsets[num][0] = (xx - s_texelHalf) * du;
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offsets[num][1] = (yy - s_texelHalf) * dv;
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++num;
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}
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}
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bgfx::setUniform(_handle, offsets, num);
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}
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void setOffsets4x4Lum(bgfx::UniformHandle _handle, uint32_t _width, uint32_t _height)
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{
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float offsets[16][4];
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float du = 1.0f/_width;
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float dv = 1.0f/_height;
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uint32_t num = 0;
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for (uint32_t yy = 0; yy < 4; ++yy)
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{
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for (uint32_t xx = 0; xx < 4; ++xx)
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{
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offsets[num][0] = (xx - 1.0f - s_texelHalf) * du;
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offsets[num][1] = (yy - 1.0f - s_texelHalf) * dv;
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++num;
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}
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}
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bgfx::setUniform(_handle, offsets, num);
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}
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inline float square(float _x)
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{
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return _x*_x;
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}
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class HDR : 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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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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bgfx::init();
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bgfx::reset(m_width, m_height, m_reset);
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// Enable m_debug text.
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bgfx::setDebug(m_debug);
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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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// Create vertex stream declaration.
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PosColorTexCoord0Vertex::init();
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// Set view m_debug names.
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bgfx::setViewName(0, "Skybox");
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bgfx::setViewName(1, "Mesh");
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bgfx::setViewName(2, "Luminance");
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bgfx::setViewName(3, "Downscale luminance 0");
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bgfx::setViewName(4, "Downscale luminance 1");
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bgfx::setViewName(5, "Downscale luminance 2");
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bgfx::setViewName(6, "Downscale luminance 3");
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bgfx::setViewName(7, "Brightness");
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bgfx::setViewName(8, "Blur vertical");
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bgfx::setViewName(9, "Blur horizontal + tonemap");
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m_uffizi = loadTexture("uffizi.dds"
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, 0
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| BGFX_TEXTURE_U_CLAMP
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| BGFX_TEXTURE_V_CLAMP
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| BGFX_TEXTURE_W_CLAMP
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);
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m_skyProgram = loadProgram("vs_hdr_skybox", "fs_hdr_skybox");
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m_lumProgram = loadProgram("vs_hdr_lum", "fs_hdr_lum");
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m_lumAvgProgram = loadProgram("vs_hdr_lumavg", "fs_hdr_lumavg");
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m_blurProgram = loadProgram("vs_hdr_blur", "fs_hdr_blur");
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m_brightProgram = loadProgram("vs_hdr_bright", "fs_hdr_bright");
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m_meshProgram = loadProgram("vs_hdr_mesh", "fs_hdr_mesh");
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m_tonemapProgram = loadProgram("vs_hdr_tonemap", "fs_hdr_tonemap");
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s_texCube = bgfx::createUniform("s_texCube", bgfx::UniformType::Int1);
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s_texColor = bgfx::createUniform("s_texColor", bgfx::UniformType::Int1);
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s_texLum = bgfx::createUniform("s_texLum", bgfx::UniformType::Int1);
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s_texBlur = bgfx::createUniform("s_texBlur", bgfx::UniformType::Int1);
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u_mtx = bgfx::createUniform("u_mtx", bgfx::UniformType::Mat4);
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u_tonemap = bgfx::createUniform("u_tonemap", bgfx::UniformType::Vec4);
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u_offset = bgfx::createUniform("u_offset", bgfx::UniformType::Vec4, 16);
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m_mesh = meshLoad("meshes/bunny.bin");
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m_fbtextures[0] = bgfx::createTexture2D(m_width, m_height, 1, bgfx::TextureFormat::BGRA8, BGFX_TEXTURE_RT|BGFX_TEXTURE_U_CLAMP|BGFX_TEXTURE_V_CLAMP);
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m_fbtextures[1] = bgfx::createTexture2D(m_width, m_height, 1, bgfx::TextureFormat::D16, BGFX_TEXTURE_RT_BUFFER_ONLY);
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m_fbh = bgfx::createFrameBuffer(BX_COUNTOF(m_fbtextures), m_fbtextures, true);
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m_lum[0] = bgfx::createFrameBuffer(128, 128, bgfx::TextureFormat::BGRA8);
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m_lum[1] = bgfx::createFrameBuffer( 64, 64, bgfx::TextureFormat::BGRA8);
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m_lum[2] = bgfx::createFrameBuffer( 16, 16, bgfx::TextureFormat::BGRA8);
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m_lum[3] = bgfx::createFrameBuffer( 4, 4, bgfx::TextureFormat::BGRA8);
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m_lum[4] = bgfx::createFrameBuffer( 1, 1, bgfx::TextureFormat::BGRA8);
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m_bright = bgfx::createFrameBuffer(bgfx::BackbufferRatio::Half, bgfx::TextureFormat::BGRA8);
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m_blur = bgfx::createFrameBuffer(bgfx::BackbufferRatio::Eighth, bgfx::TextureFormat::BGRA8);
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m_lumBgra8 = 0;
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if ( (BGFX_CAPS_TEXTURE_BLIT|BGFX_CAPS_TEXTURE_READ_BACK) == (bgfx::getCaps()->supported & (BGFX_CAPS_TEXTURE_BLIT|BGFX_CAPS_TEXTURE_READ_BACK) ) )
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{
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m_rb = bgfx::createTexture2D(1, 1, 1, bgfx::TextureFormat::BGRA8, BGFX_TEXTURE_READ_BACK);
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}
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else
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{
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m_rb.idx = bgfx::invalidHandle;
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}
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// Imgui.
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imguiCreate();
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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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m_oldWidth = 0;
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m_oldHeight = 0;
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m_oldReset = m_reset;
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m_speed = 0.37f;
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m_middleGray = 0.18f;
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m_white = 1.1f;
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m_threshold = 1.5f;
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m_scrollArea = 0;
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m_time = 0.0f;
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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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imguiDestroy();
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meshUnload(m_mesh);
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for (uint32_t ii = 0; ii < BX_COUNTOF(m_lum); ++ii)
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{
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bgfx::destroyFrameBuffer(m_lum[ii]);
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}
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bgfx::destroyFrameBuffer(m_bright);
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bgfx::destroyFrameBuffer(m_blur);
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bgfx::destroyFrameBuffer(m_fbh);
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bgfx::destroyProgram(m_meshProgram);
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bgfx::destroyProgram(m_skyProgram);
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bgfx::destroyProgram(m_tonemapProgram);
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bgfx::destroyProgram(m_lumProgram);
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bgfx::destroyProgram(m_lumAvgProgram);
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bgfx::destroyProgram(m_blurProgram);
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bgfx::destroyProgram(m_brightProgram);
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bgfx::destroyTexture(m_uffizi);
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bgfx::destroyUniform(s_texCube);
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bgfx::destroyUniform(s_texColor);
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bgfx::destroyUniform(s_texLum);
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bgfx::destroyUniform(s_texBlur);
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bgfx::destroyUniform(u_mtx);
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bgfx::destroyUniform(u_tonemap);
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bgfx::destroyUniform(u_offset);
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// Shutdown bgfx.
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bgfx::shutdown();
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return 0;
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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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if (m_oldWidth != m_width
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|| m_oldHeight != m_height
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|| m_oldReset != m_reset)
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{
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// Recreate variable size render targets when resolution changes.
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m_oldWidth = m_width;
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m_oldHeight = m_height;
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m_oldReset = m_reset;
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uint32_t msaa = (m_reset&BGFX_RESET_MSAA_MASK)>>BGFX_RESET_MSAA_SHIFT;
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bgfx::destroyFrameBuffer(m_fbh);
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m_fbtextures[0] = bgfx::createTexture2D(m_width, m_height, 1, bgfx::TextureFormat::BGRA8, ( (msaa+1)<<BGFX_TEXTURE_RT_MSAA_SHIFT)|BGFX_TEXTURE_U_CLAMP|BGFX_TEXTURE_V_CLAMP);
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m_fbtextures[1] = bgfx::createTexture2D(m_width, m_height, 1, bgfx::TextureFormat::D16, BGFX_TEXTURE_RT_BUFFER_ONLY|( (msaa+1)<<BGFX_TEXTURE_RT_MSAA_SHIFT) );
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m_fbh = bgfx::createFrameBuffer(BX_COUNTOF(m_fbtextures), m_fbtextures, true);
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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 / 2, &m_scrollArea);
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imguiSeparatorLine();
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imguiSlider("Speed", m_speed, 0.0f, 1.0f, 0.01f);
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imguiSeparator();
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imguiSlider("Middle gray", m_middleGray, 0.1f, 1.0f, 0.01f);
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imguiSlider("White point", m_white, 0.1f, 2.0f, 0.01f);
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imguiSlider("Threshold", m_threshold, 0.1f, 2.0f, 0.01f);
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if (bgfx::isValid(m_rb) )
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{
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union { uint32_t color; uint8_t bgra[4]; } cast = { m_lumBgra8 };
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float exponent = cast.bgra[3]/255.0f * 255.0f - 128.0f;
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float lumAvg = cast.bgra[2]/255.0f * exp2(exponent);
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imguiSlider("Lum Avg", lumAvg, 0.0f, 1.0f, 0.01f, false);
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}
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imguiEndScrollArea();
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imguiEndFrame();
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// This dummy draw call is here to make sure that view 0 is cleared
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// if no other draw calls are submitted to view 0.
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bgfx::touch(0);
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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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m_time += (float)(frameTime*m_speed/freq);
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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/09-hdr");
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bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Using multiple views and frame buffers.");
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bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);
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// Set views.
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for (uint32_t ii = 0; ii < 6; ++ii)
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{
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bgfx::setViewRect(ii, 0, 0, m_width, m_height);
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}
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bgfx::setViewFrameBuffer(0, m_fbh);
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bgfx::setViewFrameBuffer(1, m_fbh);
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bgfx::setViewClear(1, BGFX_CLEAR_DISCARD_DEPTH|BGFX_CLEAR_DISCARD_STENCIL);
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bgfx::setViewRect(2, 0, 0, 128, 128);
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bgfx::setViewFrameBuffer(2, m_lum[0]);
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bgfx::setViewRect(3, 0, 0, 64, 64);
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bgfx::setViewFrameBuffer(3, m_lum[1]);
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bgfx::setViewRect(4, 0, 0, 16, 16);
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bgfx::setViewFrameBuffer(4, m_lum[2]);
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bgfx::setViewRect(5, 0, 0, 4, 4);
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bgfx::setViewFrameBuffer(5, m_lum[3]);
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bgfx::setViewRect(6, 0, 0, 1, 1);
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bgfx::setViewFrameBuffer(6, m_lum[4]);
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bgfx::setViewRect(7, 0, 0, m_width/2, m_height/2);
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bgfx::setViewFrameBuffer(7, m_bright);
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bgfx::setViewRect(8, 0, 0, m_width/8, m_height/8);
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bgfx::setViewFrameBuffer(8, m_blur);
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bgfx::setViewRect(9, 0, 0, m_width, m_height);
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float view[16];
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float proj[16];
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bx::mtxIdentity(view);
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bx::mtxOrtho(proj, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 100.0f);
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// Set view and projection matrix for view 0.
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for (uint32_t ii = 0; ii < 10; ++ii)
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{
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bgfx::setViewTransform(ii, view, proj);
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}
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float at[3] = { 0.0f, 1.0f, 0.0f };
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float eye[3] = { 0.0f, 1.0f, -2.5f };
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float mtx[16];
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bx::mtxRotateXY(mtx
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, 0.0f
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, m_time
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);
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float temp[4];
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bx::vec3MulMtx(temp, eye, mtx);
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bx::mtxLookAt(view, temp, at);
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bx::mtxProj(proj, 60.0f, float(m_width)/float(m_height), 0.1f, 100.0f);
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// Set view and projection matrix for view 1.
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bgfx::setViewTransform(1, view, proj);
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bgfx::setUniform(u_mtx, mtx);
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// Render skybox into view 0.
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bgfx::setTexture(0, s_texCube, m_uffizi);
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bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
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screenSpaceQuad( (float)m_width, (float)m_height, true);
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bgfx::submit(0, m_skyProgram);
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// Render m_mesh into view 1
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bgfx::setTexture(0, s_texCube, m_uffizi);
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meshSubmit(m_mesh, 1, m_meshProgram, NULL);
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// Calculate luminance.
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setOffsets2x2Lum(u_offset, 128, 128);
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bgfx::setTexture(0, s_texColor, m_fbtextures[0]);
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bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
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screenSpaceQuad(128.0f, 128.0f, s_originBottomLeft);
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bgfx::submit(2, m_lumProgram);
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// Downscale luminance 0.
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setOffsets4x4Lum(u_offset, 128, 128);
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bgfx::setTexture(0, s_texColor, m_lum[0]);
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bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
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screenSpaceQuad(64.0f, 64.0f, s_originBottomLeft);
|
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bgfx::submit(3, m_lumAvgProgram);
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|
|
|
// Downscale luminance 1.
|
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setOffsets4x4Lum(u_offset, 64, 64);
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bgfx::setTexture(0, s_texColor, m_lum[1]);
|
|
bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
|
|
screenSpaceQuad(16.0f, 16.0f, s_originBottomLeft);
|
|
bgfx::submit(4, m_lumAvgProgram);
|
|
|
|
// Downscale luminance 2.
|
|
setOffsets4x4Lum(u_offset, 16, 16);
|
|
bgfx::setTexture(0, s_texColor, m_lum[2]);
|
|
bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
|
|
screenSpaceQuad(4.0f, 4.0f, s_originBottomLeft);
|
|
bgfx::submit(5, m_lumAvgProgram);
|
|
|
|
// Downscale luminance 3.
|
|
setOffsets4x4Lum(u_offset, 4, 4);
|
|
bgfx::setTexture(0, s_texColor, m_lum[3]);
|
|
bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
|
|
screenSpaceQuad(1.0f, 1.0f, s_originBottomLeft);
|
|
bgfx::submit(6, m_lumAvgProgram);
|
|
|
|
float tonemap[4] = { m_middleGray, square(m_white), m_threshold, m_time };
|
|
bgfx::setUniform(u_tonemap, tonemap);
|
|
|
|
// m_bright pass m_threshold is tonemap[3].
|
|
setOffsets4x4Lum(u_offset, m_width/2, m_height/2);
|
|
bgfx::setTexture(0, s_texColor, m_fbtextures[0]);
|
|
bgfx::setTexture(1, s_texLum, m_lum[4]);
|
|
bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
|
|
screenSpaceQuad( (float)m_width/2.0f, (float)m_height/2.0f, s_originBottomLeft);
|
|
bgfx::submit(7, m_brightProgram);
|
|
|
|
// m_blur m_bright pass vertically.
|
|
bgfx::setTexture(0, s_texColor, m_bright);
|
|
bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
|
|
screenSpaceQuad( (float)m_width/8.0f, (float)m_height/8.0f, s_originBottomLeft);
|
|
bgfx::submit(8, m_blurProgram);
|
|
|
|
// m_blur m_bright pass horizontally, do tonemaping and combine.
|
|
bgfx::setTexture(0, s_texColor, m_fbtextures[0]);
|
|
bgfx::setTexture(1, s_texLum, m_lum[4]);
|
|
bgfx::setTexture(2, s_texBlur, m_blur);
|
|
bgfx::setState(BGFX_STATE_RGB_WRITE|BGFX_STATE_ALPHA_WRITE);
|
|
screenSpaceQuad( (float)m_width, (float)m_height, s_originBottomLeft);
|
|
bgfx::submit(9, m_tonemapProgram);
|
|
|
|
if (bgfx::isValid(m_rb) )
|
|
{
|
|
bgfx::blit(9, m_rb, 0, 0, m_lum[4]);
|
|
bgfx::readTexture(m_rb, &m_lumBgra8);
|
|
}
|
|
|
|
// Advance to next frame. Rendering thread will be kicked to
|
|
// process submitted rendering primitives.
|
|
bgfx::frame();
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
entry::MouseState m_mouseState;
|
|
|
|
bgfx::ProgramHandle m_skyProgram;
|
|
bgfx::ProgramHandle m_lumProgram;
|
|
bgfx::ProgramHandle m_lumAvgProgram;
|
|
bgfx::ProgramHandle m_blurProgram;
|
|
bgfx::ProgramHandle m_brightProgram;
|
|
bgfx::ProgramHandle m_meshProgram;
|
|
bgfx::ProgramHandle m_tonemapProgram;
|
|
|
|
bgfx::TextureHandle m_uffizi;
|
|
bgfx::UniformHandle s_texCube;
|
|
bgfx::UniformHandle s_texColor;
|
|
bgfx::UniformHandle s_texLum;
|
|
bgfx::UniformHandle s_texBlur;
|
|
bgfx::UniformHandle u_mtx;
|
|
bgfx::UniformHandle u_tonemap;
|
|
bgfx::UniformHandle u_offset;
|
|
|
|
Mesh* m_mesh;
|
|
|
|
bgfx::TextureHandle m_fbtextures[2];
|
|
bgfx::TextureHandle m_rb;
|
|
bgfx::FrameBufferHandle m_fbh;
|
|
bgfx::FrameBufferHandle m_lum[5];
|
|
bgfx::FrameBufferHandle m_bright;
|
|
bgfx::FrameBufferHandle m_blur;
|
|
|
|
uint32_t m_width;
|
|
uint32_t m_height;
|
|
uint32_t m_debug;
|
|
uint32_t m_reset;
|
|
uint32_t m_lumBgra8;
|
|
|
|
uint32_t m_oldWidth;
|
|
uint32_t m_oldHeight;
|
|
uint32_t m_oldReset;
|
|
|
|
float m_speed;
|
|
float m_middleGray;
|
|
float m_white;
|
|
float m_threshold;
|
|
|
|
int32_t m_scrollArea;
|
|
|
|
float m_time;
|
|
};
|
|
|
|
ENTRY_IMPLEMENT_MAIN(HDR);
|