352 lines
8.5 KiB
C++
352 lines
8.5 KiB
C++
/*
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* Copyright 2011-2021 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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#include "imgui/imgui.h"
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namespace
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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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static void init()
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{
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ms_layout
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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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.end();
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};
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static bgfx::VertexLayout ms_layout;
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};
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bgfx::VertexLayout PosColorVertex::ms_layout;
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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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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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class ExampleInstancing : public entry::AppI
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{
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public:
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ExampleInstancing(const char* _name, const char* _description, const char* _url)
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: entry::AppI(_name, _description, _url)
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{
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}
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void init(int32_t _argc, const char* const* _argv, uint32_t _width, uint32_t _height) override
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{
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Args args(_argc, _argv);
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m_width = _width;
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m_height = _height;
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m_debug = BGFX_DEBUG_TEXT;
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m_reset = BGFX_RESET_VSYNC;
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m_useInstancing = true;
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m_lastFrameMissing = 0;
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m_sideSize = 11;
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bgfx::Init init;
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init.type = args.m_type;
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init.vendorId = args.m_pciId;
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init.resolution.width = m_width;
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init.resolution.height = m_height;
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init.resolution.reset = m_reset;
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bgfx::init(init);
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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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// Create vertex stream declaration.
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PosColorVertex::init();
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// Create static vertex buffer.
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m_vbh = bgfx::createVertexBuffer(
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bgfx::makeRef(s_cubeVertices, sizeof(s_cubeVertices) )
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, PosColorVertex::ms_layout
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);
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// Create static index buffer.
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m_ibh = bgfx::createIndexBuffer(
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bgfx::makeRef(s_cubeIndices, sizeof(s_cubeIndices) )
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);
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// Create program from shaders.
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m_program = loadProgram("vs_instancing", "fs_instancing");
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m_program_non_instanced = loadProgram("vs_cubes", "fs_cubes");
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m_timeOffset = bx::getHPCounter();
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imguiCreate();
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}
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int shutdown() override
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{
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imguiDestroy();
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// Cleanup.
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bgfx::destroy(m_ibh);
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bgfx::destroy(m_vbh);
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bgfx::destroy(m_program);
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bgfx::destroy(m_program_non_instanced);
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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() 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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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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, uint16_t(m_width)
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, uint16_t(m_height)
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);
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showExampleDialog(this);
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ImGui::SetNextWindowPos(
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ImVec2(m_width - m_width / 5.0f - 10.0f, 10.0f)
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, ImGuiCond_FirstUseEver
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);
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ImGui::SetNextWindowSize(
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ImVec2(m_width / 5.0f, m_height / 2.0f)
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, ImGuiCond_FirstUseEver
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);
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ImGui::Begin("Settings"
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, NULL
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, 0
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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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// Check if instancing is supported.
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const bool instancingSupported = 0 != (BGFX_CAPS_INSTANCING & caps->supported);
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m_useInstancing &= instancingSupported;
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ImGui::Text("%d draw calls", bgfx::getStats()->numDraw);
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ImGui::PushEnabled(instancingSupported);
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ImGui::Checkbox("Use Instancing", &m_useInstancing);
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ImGui::PopEnabled();
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ImGui::Text("Grid Side Size:");
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ImGui::SliderInt("", (int*)&m_sideSize, 1, 512);
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if (m_lastFrameMissing > 0)
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{
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ImGui::TextColored(ImVec4(1.0f, 0.0f, 0.0f, 1.0f), "Couldn't draw %d cubes last frame", m_lastFrameMissing);
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}
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if (bgfx::getStats()->numDraw >= bgfx::getCaps()->limits.maxDrawCalls)
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{
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ImGui::TextColored(ImVec4(1.0f, 0.0f, 0.0f, 1.0f), "Draw call limit reached!");
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}
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ImGui::End();
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imguiEndFrame();
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// Set view 0 default viewport.
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bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(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 view 0.
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bgfx::touch(0);
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float time = (float)( (bx::getHPCounter() - m_timeOffset)/double(bx::getHPFrequency() ) );
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if (!instancingSupported)
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{
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// When instancing is not supported by GPU, implement alternative
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// code path that doesn't use instancing.
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bool blink = uint32_t(time*3.0f)&1;
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bgfx::dbgTextPrintf(0, 0, blink ? 0x4f : 0x04, " Instancing is not supported by GPU. ");
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m_useInstancing = false;
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}
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const bx::Vec3 at = { 0.0f, 0.0f, 0.0f };
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const bx::Vec3 eye = { 0.0f, 0.0f, -35.0f };
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// Set view and projection matrix for view 0.
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{
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float view[16];
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bx::mtxLookAt(view, eye, at);
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float proj[16];
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bx::mtxProj(proj, 60.0f, float(m_width)/float(m_height), 0.1f, 100.0f, bgfx::getCaps()->homogeneousDepth);
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bgfx::setViewTransform(0, view, proj);
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// Set view 0 default viewport.
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bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );
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}
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m_lastFrameMissing = 0;
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if (m_useInstancing)
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{
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// 80 bytes stride = 64 bytes for 4x4 matrix + 16 bytes for RGBA color.
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const uint16_t instanceStride = 80;
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// to total number of instances to draw
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uint32_t totalCubes = m_sideSize * m_sideSize;
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// figure out how big of a buffer is available
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uint32_t drawnCubes = bgfx::getAvailInstanceDataBuffer(totalCubes, instanceStride);
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// save how many we couldn't draw due to buffer room so we can display it
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m_lastFrameMissing = totalCubes - drawnCubes;
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bgfx::InstanceDataBuffer idb;
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bgfx::allocInstanceDataBuffer(&idb, drawnCubes, instanceStride);
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uint8_t* data = idb.data;
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for (uint32_t ii = 0; ii < drawnCubes; ++ii)
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{
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uint32_t yy = ii / m_sideSize;
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uint32_t xx = ii % m_sideSize;
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float* mtx = (float*)data;
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bx::mtxRotateXY(mtx, time + xx * 0.21f, time + yy * 0.37f);
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mtx[12] = -15.0f + float(xx) * 3.0f;
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mtx[13] = -15.0f + float(yy) * 3.0f;
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mtx[14] = 0.0f;
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float* color = (float*)&data[64];
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color[0] = bx::sin(time + float(xx) / 11.0f) * 0.5f + 0.5f;
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color[1] = bx::cos(time + float(yy) / 11.0f) * 0.5f + 0.5f;
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color[2] = bx::sin(time * 3.0f) * 0.5f + 0.5f;
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color[3] = 1.0f;
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data += instanceStride;
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}
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// Set vertex and index buffer.
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bgfx::setVertexBuffer(0, m_vbh);
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bgfx::setIndexBuffer(m_ibh);
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// Set instance data buffer.
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bgfx::setInstanceDataBuffer(&idb);
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// Set render states.
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bgfx::setState(BGFX_STATE_DEFAULT);
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// Submit primitive for rendering to view 0.
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bgfx::submit(0, m_program);
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}
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else
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{
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// non-instanced path
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for (uint32_t yy = 0; yy < m_sideSize; ++yy)
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{
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for (uint32_t xx = 0; xx < m_sideSize; ++xx)
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{
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float mtx[16];
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bx::mtxRotateXY(mtx, time + xx * 0.21f, time + yy * 0.37f);
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mtx[12] = -15.0f + float(xx) * 3.0f;
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mtx[13] = -15.0f + float(yy) * 3.0f;
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mtx[14] = 0.0f;
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// Set model matrix for rendering.
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bgfx::setTransform(mtx);
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// Set vertex and index buffer.
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bgfx::setVertexBuffer(0, m_vbh);
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bgfx::setIndexBuffer(m_ibh);
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// Set render states.
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bgfx::setState(BGFX_STATE_DEFAULT);
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// Submit primitive for rendering to view 0.
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bgfx::submit(0, m_program_non_instanced);
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}
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}
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}
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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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entry::MouseState m_mouseState;
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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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bool m_useInstancing;
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uint32_t m_lastFrameMissing;
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uint32_t m_sideSize;
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bgfx::VertexBufferHandle m_vbh;
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bgfx::IndexBufferHandle m_ibh;
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bgfx::ProgramHandle m_program;
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bgfx::ProgramHandle m_program_non_instanced;
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int64_t m_timeOffset;
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};
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} // namespace
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ENTRY_IMPLEMENT_MAIN(
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ExampleInstancing
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, "05-instancing"
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, "Geometry instancing."
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, "https://bkaradzic.github.io/bgfx/examples.html#instancing"
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);
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