450 lines
13 KiB
C++
450 lines
13 KiB
C++
/*
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* Copyright 2014 Stanlo Slasinski. 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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#include "camera.h"
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#include <bgfx/bgfx.h>
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struct ParamsData
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{
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float timeStep;
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int32_t dispatchSize;
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float gravity;
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float damping;
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float particleIntensity;
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float particleSize;
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int32_t baseSeed;
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float particlePower;
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float initialSpeed;
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int32_t initialShape;
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float maxAccel;
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};
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void initializeParams(int32_t _mode, ParamsData* _params)
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{
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switch(_mode)
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{
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case 0:
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_params->timeStep = 0.0067f;
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_params->dispatchSize = 32;
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_params->gravity = 0.069f;
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_params->damping = 0.0f;
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_params->particleIntensity = 0.35f;
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_params->particleSize = 0.925f;
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_params->baseSeed = 0;
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_params->particlePower = 5.0f;
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_params->initialSpeed = 122.6f;
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_params->initialShape = 0;
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_params->maxAccel = 30.0;
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break;
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case 1:
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_params->timeStep = 0.0157f;
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_params->dispatchSize = 32;
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_params->gravity = 0.109f;
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_params->damping = 0.25f;
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_params->particleIntensity = 0.64f;
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_params->particleSize = 0.279f;
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_params->baseSeed = 57;
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_params->particlePower = 3.5f;
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_params->initialSpeed = 3.2f;
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_params->initialShape = 1;
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_params->maxAccel = 100.0;
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break;
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case 2:
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_params->timeStep = 0.02f;
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_params->dispatchSize = 32;
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_params->gravity = 0.24f;
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_params->damping = 0.12f;
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_params->particleIntensity = 1.0f;
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_params->particleSize = 1.0f;
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_params->baseSeed = 23;
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_params->particlePower = 4.0f;
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_params->initialSpeed = 31.1f;
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_params->initialShape = 2;
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_params->maxAccel = 39.29f;
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break;
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case 3:
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_params->timeStep = 0.0118f;
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_params->dispatchSize = 32;
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_params->gravity = 0.141f;
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_params->damping = 1.0f;
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_params->particleIntensity = 0.64f;
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_params->particleSize = 0.28f;
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_params->baseSeed = 60;
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_params->particlePower = 1.97f;
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_params->initialSpeed = 69.7f;
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_params->initialShape = 3;
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_params->maxAccel = 3.21f;
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break;
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}
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}
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static const float s_quadVertices[] =
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{
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1.0f, 1.0f,
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-1.0f, 1.0f,
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-1.0f, -1.0f,
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1.0f, -1.0f,
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};
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static const uint16_t s_quadIndices[] = { 0, 1, 2, 2, 3, 0, };
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const uint32_t kThreadGroupUpdateSize = 512;
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const uint32_t kMaxParticleCount = 32 * 1024;
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class ExampleNbody : 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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const bgfx::Caps* caps = bgfx::getCaps();
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const bool computeSupported = !!(caps->supported & BGFX_CAPS_COMPUTE);
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const bool indirectSupported = !!(caps->supported & BGFX_CAPS_DRAW_INDIRECT);
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if (computeSupported)
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{
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// Imgui.
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imguiCreate();
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bgfx::VertexDecl quadVertexDecl;
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quadVertexDecl.begin()
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.add(bgfx::Attrib::Position, 2, bgfx::AttribType::Float)
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.end();
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// Create static vertex buffer.
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m_vbh = bgfx::createVertexBuffer(
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// Static data can be passed with bgfx::makeRef
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bgfx::makeRef(s_quadVertices, sizeof(s_quadVertices) )
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, quadVertexDecl
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);
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// Create static index buffer.
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m_ibh = bgfx::createIndexBuffer(
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// Static data can be passed with bgfx::makeRef
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bgfx::makeRef(s_quadIndices, sizeof(s_quadIndices) )
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);
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// Create particle program from shaders.
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m_particleProgram = loadProgram("vs_particle", "fs_particle");
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// Setup compute buffers
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bgfx::VertexDecl computeVertexDecl;
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computeVertexDecl.begin()
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.add(bgfx::Attrib::TexCoord0, 4, bgfx::AttribType::Float)
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.end();
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m_currPositionBuffer0 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
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m_currPositionBuffer1 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
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m_prevPositionBuffer0 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
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m_prevPositionBuffer1 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
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u_params = bgfx::createUniform("u_params", bgfx::UniformType::Vec4, 3);
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m_initInstancesProgram = bgfx::createProgram(loadShader("cs_init_instances"), true);
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m_updateInstancesProgram = bgfx::createProgram(loadShader("cs_update_instances"), true);
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m_indirectProgram = BGFX_INVALID_HANDLE;
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m_indirectBuffer = BGFX_INVALID_HANDLE;
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if (indirectSupported)
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{
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m_indirectProgram = bgfx::createProgram(loadShader("cs_indirect"), true);
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m_indirectBuffer = bgfx::createIndirectBuffer(2);
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}
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initializeParams(0, &m_paramsData);
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bgfx::setUniform(u_params, &m_paramsData, 3);
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bgfx::setBuffer(0, m_prevPositionBuffer0, bgfx::Access::Write);
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bgfx::setBuffer(1, m_currPositionBuffer0, bgfx::Access::Write);
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bgfx::dispatch(0, m_initInstancesProgram, kMaxParticleCount / kThreadGroupUpdateSize, 1, 1);
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float initialPos[3] = { 0.0f, 0.0f, -45.0f };
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cameraCreate();
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cameraSetPosition(initialPos);
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cameraSetVerticalAngle(0.0f);
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m_useIndirect = false;
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m_timeOffset = bx::getHPCounter();
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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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if (bgfx::isValid(m_indirectProgram) )
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{
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bgfx::destroyProgram(m_indirectProgram);
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bgfx::destroyIndirectBuffer(m_indirectBuffer);
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}
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bgfx::destroyUniform(u_params);
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bgfx::destroyDynamicVertexBuffer(m_currPositionBuffer0);
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bgfx::destroyDynamicVertexBuffer(m_currPositionBuffer1);
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bgfx::destroyDynamicVertexBuffer(m_prevPositionBuffer0);
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bgfx::destroyDynamicVertexBuffer(m_prevPositionBuffer1);
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bgfx::destroyProgram(m_updateInstancesProgram);
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bgfx::destroyProgram(m_initInstancesProgram);
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bgfx::destroyIndexBuffer(m_ibh);
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bgfx::destroyVertexBuffer(m_vbh);
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bgfx::destroyProgram(m_particleProgram);
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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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entry::MouseState mouseState;
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if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &mouseState) )
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{
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const bgfx::Caps* caps = bgfx::getCaps();
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const bool computeSupported = !!(caps->supported & BGFX_CAPS_COMPUTE);
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const bool indirectSupported = !!(caps->supported & BGFX_CAPS_DRAW_INDIRECT);
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int64_t now = bx::getHPCounter();
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float time = (float)( (now - m_timeOffset)/double(bx::getHPFrequency() ) );
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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 float deltaTime = float(frameTime/freq);
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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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if (computeSupported)
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{
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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/24-nbody");
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bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: N-body simulation with compute shaders using buffers.");
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imguiBeginFrame(mouseState.m_mx
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, mouseState.m_my
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, (mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
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| (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
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| (mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
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, 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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static int32_t scrollArea = 0;
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imguiBeginScrollArea("Settings", m_width - m_width / 4 - 10, 10, m_width / 4, 500, &scrollArea);
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imguiSlider("Random seed", m_paramsData.baseSeed, 0, 100);
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int32_t shape = imguiChoose(m_paramsData.initialShape, "Point", "Sphere", "Box", "Donut");
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imguiSlider("Initial speed", m_paramsData.initialSpeed, 0.0f, 300.0f, 0.1f);
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bool defaults = imguiButton("Reset");
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imguiSeparatorLine();
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imguiSlider("Particle count (x512)", m_paramsData.dispatchSize, 1, 64);
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imguiSlider("Gravity", m_paramsData.gravity, 0.0f, 0.3f, 0.001f);
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imguiSlider("Damping", m_paramsData.damping, 0.0f, 1.0f, 0.01f);
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imguiSlider("Max acceleration", m_paramsData.maxAccel, 0.0f, 100.0f, 0.01f);
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imguiSlider("Time step", m_paramsData.timeStep, 0.0f, 0.02f, 0.0001f);
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imguiSeparatorLine();
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imguiSlider("Particle intensity", m_paramsData.particleIntensity, 0.0f, 1.0f, 0.001f);
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imguiSlider("Particle size", m_paramsData.particleSize, 0.0f, 1.0f, 0.001f);
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imguiSlider("Particle power", m_paramsData.particlePower, 0.001f, 16.0f, 0.01f);
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imguiSeparatorLine();
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if (imguiCheck("Use draw/dispatch indirect", m_useIndirect, indirectSupported) )
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{
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m_useIndirect = !m_useIndirect;
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}
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imguiEndScrollArea();
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imguiEndFrame();
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// Modify parameters and reset if shape is changed
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if (shape != m_paramsData.initialShape)
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{
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defaults = true;
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initializeParams(shape, &m_paramsData);
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}
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if (defaults)
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{
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bgfx::setBuffer(0, m_prevPositionBuffer0, bgfx::Access::Write);
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bgfx::setBuffer(1, m_currPositionBuffer0, bgfx::Access::Write);
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bgfx::setUniform(u_params, &m_paramsData, 3);
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bgfx::dispatch(0, m_initInstancesProgram, kMaxParticleCount / kThreadGroupUpdateSize, 1, 1);
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}
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if (m_useIndirect)
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{
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bgfx::setUniform(u_params, &m_paramsData, 3);
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bgfx::setBuffer(0, m_indirectBuffer, bgfx::Access::Write);
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bgfx::dispatch(0, m_indirectProgram);
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}
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bgfx::setBuffer(0, m_prevPositionBuffer0, bgfx::Access::Read);
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bgfx::setBuffer(1, m_currPositionBuffer0, bgfx::Access::Read);
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bgfx::setBuffer(2, m_prevPositionBuffer1, bgfx::Access::Write);
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bgfx::setBuffer(3, m_currPositionBuffer1, bgfx::Access::Write);
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bgfx::setUniform(u_params, &m_paramsData, 3);
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if (m_useIndirect)
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{
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bgfx::dispatch(0, m_updateInstancesProgram, m_indirectBuffer, 1);
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}
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else
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{
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bgfx::dispatch(0, m_updateInstancesProgram, uint16_t(m_paramsData.dispatchSize), 1, 1);
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}
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bx::xchg(m_currPositionBuffer0, m_currPositionBuffer1);
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bx::xchg(m_prevPositionBuffer0, m_prevPositionBuffer1);
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// Update camera.
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cameraUpdate(deltaTime, mouseState);
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float view[16];
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cameraGetViewMtx(view);
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// Set view and projection matrix for view 0.
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const bgfx::HMD* hmd = bgfx::getHMD();
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if (NULL != hmd && 0 != (hmd->flags & BGFX_HMD_RENDERING) )
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{
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float viewHead[16];
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float eye[3] = {};
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bx::mtxQuatTranslationHMD(viewHead, hmd->eye[0].rotation, eye);
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float tmp[16];
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bx::mtxMul(tmp, view, viewHead);
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bgfx::setViewTransform(
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0
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, tmp
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, hmd->eye[0].projection
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, BGFX_VIEW_STEREO
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, hmd->eye[1].projection
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);
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// Set view 0 default viewport.
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//
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// Use HMD's width/height since HMD's internal frame buffer size
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// might be much larger than window size.
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bgfx::setViewRect(0, 0, 0, hmd->width, hmd->height);
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}
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else
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{
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float proj[16];
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bx::mtxProj(
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proj
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, 90.0f
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, float(m_width)/float(m_height)
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, 0.1f
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, 10000.0f
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, bgfx::getCaps()->homogeneousDepth
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);
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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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// 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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bgfx::setInstanceDataBuffer(m_currPositionBuffer0
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, 0
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, m_paramsData.dispatchSize * kThreadGroupUpdateSize
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);
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// Set render states.
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bgfx::setState(0
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| BGFX_STATE_RGB_WRITE
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| BGFX_STATE_BLEND_ADD
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| BGFX_STATE_DEPTH_TEST_ALWAYS
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);
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// Submit primitive for rendering to view 0.
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if (m_useIndirect)
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{
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bgfx::submit(0, m_particleProgram, m_indirectBuffer, 0);
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}
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else
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{
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bgfx::submit(0, m_particleProgram);
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}
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}
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else
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{
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bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );
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bgfx::dbgTextClear();
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bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/24-nbody");
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bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: N-body simulation with compute shaders using buffers.");
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bool blink = uint32_t(time*3.0f)&1;
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bgfx::dbgTextPrintf(0, 5, blink ? 0x1f : 0x01, " Compute is not supported by GPU. ");
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bgfx::touch(0);
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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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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_useIndirect;
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ParamsData m_paramsData;
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bgfx::VertexBufferHandle m_vbh;
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bgfx::IndexBufferHandle m_ibh;
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bgfx::ProgramHandle m_particleProgram;
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bgfx::ProgramHandle m_indirectProgram;
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bgfx::ProgramHandle m_initInstancesProgram;
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bgfx::ProgramHandle m_updateInstancesProgram;
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bgfx::IndirectBufferHandle m_indirectBuffer;
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bgfx::DynamicVertexBufferHandle m_currPositionBuffer0;
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bgfx::DynamicVertexBufferHandle m_currPositionBuffer1;
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bgfx::DynamicVertexBufferHandle m_prevPositionBuffer0;
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bgfx::DynamicVertexBufferHandle m_prevPositionBuffer1;
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bgfx::UniformHandle u_params;
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int64_t m_timeOffset;
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};
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ENTRY_IMPLEMENT_MAIN(ExampleNbody);
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