/* * Copyright 2011-2018 Branimir Karadzic. All rights reserved. * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause */ #include "common.h" #include "bgfx_utils.h" #include "imgui/imgui.h" namespace { struct PosColorVertex { float m_x; float m_y; float m_z; uint32_t m_abgr; static void init() { ms_decl .begin() .add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float) .add(bgfx::Attrib::Color0, 4, bgfx::AttribType::Uint8, true) .end(); }; static bgfx::VertexDecl ms_decl; }; bgfx::VertexDecl PosColorVertex::ms_decl; static PosColorVertex s_cubeVertices[8] = { {-1.0f, 1.0f, 1.0f, 0xff000000 }, { 1.0f, 1.0f, 1.0f, 0xff0000ff }, {-1.0f, -1.0f, 1.0f, 0xff00ff00 }, { 1.0f, -1.0f, 1.0f, 0xff00ffff }, {-1.0f, 1.0f, -1.0f, 0xffff0000 }, { 1.0f, 1.0f, -1.0f, 0xffff00ff }, {-1.0f, -1.0f, -1.0f, 0xffffff00 }, { 1.0f, -1.0f, -1.0f, 0xffffffff }, }; static const uint16_t s_cubeIndices[36] = { 0, 1, 2, // 0 1, 3, 2, 4, 6, 5, // 2 5, 6, 7, 0, 2, 4, // 4 4, 2, 6, 1, 5, 3, // 6 5, 7, 3, 0, 4, 1, // 8 4, 5, 1, 2, 3, 6, // 10 6, 3, 7, }; class ExampleInstancing : public entry::AppI { public: ExampleInstancing(const char* _name, const char* _description) : entry::AppI(_name, _description) { } void init(int32_t _argc, const char* const* _argv, uint32_t _width, uint32_t _height) override { Args args(_argc, _argv); m_width = _width; m_height = _height; m_debug = BGFX_DEBUG_TEXT; m_reset = BGFX_RESET_VSYNC; bgfx::Init init; init.type = args.m_type; init.vendorId = args.m_pciId; init.resolution.width = m_width; init.resolution.height = m_height; init.resolution.reset = m_reset; bgfx::init(init); // Enable debug text. bgfx::setDebug(m_debug); // Set view 0 clear state. bgfx::setViewClear(0 , BGFX_CLEAR_COLOR|BGFX_CLEAR_DEPTH , 0x303030ff , 1.0f , 0 ); // Create vertex stream declaration. PosColorVertex::init(); // Create static vertex buffer. m_vbh = bgfx::createVertexBuffer( bgfx::makeRef(s_cubeVertices, sizeof(s_cubeVertices) ) , PosColorVertex::ms_decl ); // Create static index buffer. m_ibh = bgfx::createIndexBuffer( bgfx::makeRef(s_cubeIndices, sizeof(s_cubeIndices) ) ); // Create program from shaders. m_program = loadProgram("vs_instancing", "fs_instancing"); m_timeOffset = bx::getHPCounter(); imguiCreate(); } int shutdown() override { imguiDestroy(); // Cleanup. bgfx::destroy(m_ibh); bgfx::destroy(m_vbh); bgfx::destroy(m_program); // Shutdown bgfx. bgfx::shutdown(); return 0; } bool update() override { if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &m_mouseState) ) { imguiBeginFrame(m_mouseState.m_mx , m_mouseState.m_my , (m_mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0) | (m_mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0) | (m_mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0) , m_mouseState.m_mz , uint16_t(m_width) , uint16_t(m_height) ); showExampleDialog(this); imguiEndFrame(); // Set view 0 default viewport. bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) ); // This dummy draw call is here to make sure that view 0 is cleared // if no other draw calls are submitted to view 0. bgfx::touch(0); float time = (float)( (bx::getHPCounter() - m_timeOffset)/double(bx::getHPFrequency() ) ); // Get renderer capabilities info. const bgfx::Caps* caps = bgfx::getCaps(); // Check if instancing is supported. if (0 == (BGFX_CAPS_INSTANCING & caps->supported) ) { // When instancing is not supported by GPU, implement alternative // code path that doesn't use instancing. bool blink = uint32_t(time*3.0f)&1; bgfx::dbgTextPrintf(0, 0, blink ? 0x4f : 0x04, " Instancing is not supported by GPU. "); } else { const bx::Vec3 at = { 0.0f, 0.0f, 0.0f }; const bx::Vec3 eye = { 0.0f, 0.0f, -35.0f }; // Set view and projection matrix for view 0. { float view[16]; bx::mtxLookAt(view, eye, at); float proj[16]; bx::mtxProj(proj, 60.0f, float(m_width)/float(m_height), 0.1f, 100.0f, bgfx::getCaps()->homogeneousDepth); bgfx::setViewTransform(0, view, proj); // Set view 0 default viewport. bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) ); } // 80 bytes stride = 64 bytes for 4x4 matrix + 16 bytes for RGBA color. const uint16_t instanceStride = 80; // 11x11 cubes const uint32_t numInstances = 121; if (numInstances == bgfx::getAvailInstanceDataBuffer(numInstances, instanceStride) ) { bgfx::InstanceDataBuffer idb; bgfx::allocInstanceDataBuffer(&idb, numInstances, instanceStride); uint8_t* data = idb.data; // Write instance data for 11x11 cubes. for (uint32_t yy = 0; yy < 11; ++yy) { for (uint32_t xx = 0; xx < 11; ++xx) { float* mtx = (float*)data; bx::mtxRotateXY(mtx, time + xx*0.21f, time + yy*0.37f); mtx[12] = -15.0f + float(xx)*3.0f; mtx[13] = -15.0f + float(yy)*3.0f; mtx[14] = 0.0f; float* color = (float*)&data[64]; color[0] = bx::sin(time+float(xx)/11.0f)*0.5f+0.5f; color[1] = bx::cos(time+float(yy)/11.0f)*0.5f+0.5f; color[2] = bx::sin(time*3.0f)*0.5f+0.5f; color[3] = 1.0f; data += instanceStride; } } // Set vertex and index buffer. bgfx::setVertexBuffer(0, m_vbh); bgfx::setIndexBuffer(m_ibh); // Set instance data buffer. bgfx::setInstanceDataBuffer(&idb); // Set render states. bgfx::setState(BGFX_STATE_DEFAULT); // Submit primitive for rendering to view 0. bgfx::submit(0, m_program); } } // Advance to next frame. Rendering thread will be kicked to // process submitted rendering primitives. bgfx::frame(); return true; } return false; } entry::MouseState m_mouseState; uint32_t m_width; uint32_t m_height; uint32_t m_debug; uint32_t m_reset; bgfx::VertexBufferHandle m_vbh; bgfx::IndexBufferHandle m_ibh; bgfx::ProgramHandle m_program; int64_t m_timeOffset; }; } // namespace ENTRY_IMPLEMENT_MAIN(ExampleInstancing, "05-instancing", "Geometry instancing.");