mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-12-02 20:36:50 -05:00
264 lines
6.2 KiB
C++
264 lines
6.2 KiB
C++
/*
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* Copyright 2011-2016 Branimir Karadzic. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-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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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_abgr;
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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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static bool s_oglNdc = false;
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inline void mtxProj(float* _result, float _fovy, float _aspect, float _near, float _far)
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{
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bx::mtxProj(_result, _fovy, _aspect, _near, _far, s_oglNdc);
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}
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void renderScreenSpaceQuad(uint32_t _view, bgfx::ProgramHandle _program, float _x, float _y, float _width, float _height)
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{
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bgfx::TransientVertexBuffer tvb;
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bgfx::TransientIndexBuffer tib;
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if (bgfx::allocTransientBuffers(&tvb, PosColorTexCoord0Vertex::ms_decl, 4, &tib, 6) )
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{
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PosColorTexCoord0Vertex* vertex = (PosColorTexCoord0Vertex*)tvb.data;
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float zz = 0.0f;
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const float minx = _x;
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const float maxx = _x + _width;
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const float miny = _y;
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const float maxy = _y + _height;
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float minu = -1.0f;
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float minv = -1.0f;
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float maxu = 1.0f;
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float maxv = 1.0f;
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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_abgr = 0xff0000ff;
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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_abgr = 0xff00ff00;
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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_abgr = 0xffff0000;
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vertex[2].m_u = maxu;
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vertex[2].m_v = maxv;
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vertex[3].m_x = minx;
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vertex[3].m_y = maxy;
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vertex[3].m_z = zz;
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vertex[3].m_abgr = 0xffffffff;
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vertex[3].m_u = minu;
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vertex[3].m_v = maxv;
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uint16_t* indices = (uint16_t*)tib.data;
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indices[0] = 0;
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indices[1] = 2;
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indices[2] = 1;
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indices[3] = 0;
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indices[4] = 3;
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indices[5] = 2;
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bgfx::setState(BGFX_STATE_DEFAULT);
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bgfx::setIndexBuffer(&tib);
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bgfx::setVertexBuffer(&tvb);
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bgfx::submit(_view, _program);
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}
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}
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class ExampleRaymarch : 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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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(args.m_type, args.m_pciId);
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bgfx::reset(m_width, m_height, m_reset);
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// Enable 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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// Setup root path for binary shaders. Shader binaries are different
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// for each renderer.
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switch (bgfx::getRendererType() )
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{
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default:
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break;
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case bgfx::RendererType::OpenGL:
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case bgfx::RendererType::OpenGLES:
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s_oglNdc = true;
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break;
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}
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// Create vertex stream declaration.
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PosColorTexCoord0Vertex::init();
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u_mtx = bgfx::createUniform("u_mtx", bgfx::UniformType::Mat4);
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u_lightDirTime = bgfx::createUniform("u_lightDirTime", bgfx::UniformType::Vec4);
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// Create program from shaders.
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m_program = loadProgram("vs_raymarching", "fs_raymarching");
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m_timeOffset = bx::getHPCounter();
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}
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int shutdown() BX_OVERRIDE
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{
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// Cleanup.
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bgfx::destroyProgram(m_program);
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bgfx::destroyUniform(u_mtx);
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bgfx::destroyUniform(u_lightDirTime);
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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) )
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{
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// Set view 0 default viewport.
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bgfx::setViewRect(0, 0, 0, m_width, m_height);
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// Set view 1 default viewport.
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bgfx::setViewRect(1, 0, 0, m_width, m_height);
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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 viewZ 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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// Use 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/03-raymarch");
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bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Updating shader uniforms.");
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bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);
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float at[3] = { 0.0f, 0.0f, 0.0f };
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float eye[3] = { 0.0f, 0.0f, -15.0f };
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float view[16];
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float proj[16];
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bx::mtxLookAt(view, eye, at);
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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(0, view, proj);
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float ortho[16];
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bx::mtxOrtho(ortho, 0.0f, 1280.0f, 720.0f, 0.0f, 0.0f, 100.0f);
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// Set view and projection matrix for view 0.
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bgfx::setViewTransform(1, NULL, ortho);
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float time = (float)( (bx::getHPCounter()-m_timeOffset)/double(bx::getHPFrequency() ) );
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float vp[16];
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bx::mtxMul(vp, view, proj);
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float mtx[16];
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bx::mtxRotateXY(mtx
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, time
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, time*0.37f
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);
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float mtxInv[16];
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bx::mtxInverse(mtxInv, mtx);
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float lightDirModel[4] = { -0.4f, -0.5f, -1.0f, 0.0f };
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float lightDirModelN[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
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bx::vec3Norm(lightDirModelN, lightDirModel);
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float lightDirTime[4];
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bx::vec4MulMtx(lightDirTime, lightDirModelN, mtxInv);
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lightDirTime[3] = time;
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bgfx::setUniform(u_lightDirTime, lightDirTime);
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float mvp[16];
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bx::mtxMul(mvp, mtx, vp);
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float invMvp[16];
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bx::mtxInverse(invMvp, mvp);
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bgfx::setUniform(u_mtx, invMvp);
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renderScreenSpaceQuad(1, m_program, 0.0f, 0.0f, 1280.0f, 720.0f);
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// Advance to next frame. Rendering thread will be kicked to
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// process submitted rendering primitives.
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bgfx::frame();
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return true;
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}
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return false;
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}
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uint32_t m_width;
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uint32_t m_height;
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uint32_t m_debug;
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uint32_t m_reset;
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int64_t m_timeOffset;
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bgfx::UniformHandle u_mtx;
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bgfx::UniformHandle u_lightDirTime;
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bgfx::ProgramHandle m_program;
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};
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ENTRY_IMPLEMENT_MAIN(ExampleRaymarch);
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