int _main_(int /*_argc*/, char** /*_argv*/)
{
uint32_t width = 1280;
uint32_t height = 720;
uint32_t debug = BGFX_DEBUG_TEXT;
uint32_t reset = BGFX_RESET_VSYNC;
bgfx::init();
bgfx::reset(width, height, reset);
// Enable debug text.
bgfx::setDebug(debug);
// Set clear color palette for index 0
bgfx::setClearColor(0, UINT32_C(0x00000000) );
// Set clear color palette for index 1
bgfx::setClearColor(1, UINT32_C(0x303030ff) );
// Set geometry pass view clear state.
bgfx::setViewClear(RENDER_PASS_GEOMETRY_ID
, BGFX_CLEAR_COLOR|BGFX_CLEAR_DEPTH
, 1.0f
, 0
, 1
);
// Set light pass view clear state.
bgfx::setViewClear(RENDER_PASS_LIGHT_ID
, BGFX_CLEAR_COLOR|BGFX_CLEAR_DEPTH
, 1.0f
, 0
, 0
);
// Create vertex stream declaration.
PosNormalTangentTexcoordVertex::init();
PosTexCoord0Vertex::init();
DebugVertex::init();
calcTangents(s_cubeVertices
, BX_COUNTOF(s_cubeVertices)
, PosNormalTangentTexcoordVertex::ms_decl
, s_cubeIndices
, BX_COUNTOF(s_cubeIndices)
);
// Create static vertex buffer.
bgfx::VertexBufferHandle vbh = bgfx::createVertexBuffer(
bgfx::makeRef(s_cubeVertices, sizeof(s_cubeVertices) )
, PosNormalTangentTexcoordVertex::ms_decl
);
// Create static index buffer.
bgfx::IndexBufferHandle ibh = bgfx::createIndexBuffer(bgfx::makeRef(s_cubeIndices, sizeof(s_cubeIndices) ) );
// Create texture sampler uniforms.
bgfx::UniformHandle s_texColor = bgfx::createUniform("s_texColor", bgfx::UniformType::Uniform1iv);
bgfx::UniformHandle s_texNormal = bgfx::createUniform("s_texNormal", bgfx::UniformType::Uniform1iv);
bgfx::UniformHandle s_albedo = bgfx::createUniform("s_albedo", bgfx::UniformType::Uniform1iv);
bgfx::UniformHandle s_normal = bgfx::createUniform("s_normal", bgfx::UniformType::Uniform1iv);
bgfx::UniformHandle s_depth = bgfx::createUniform("s_depth", bgfx::UniformType::Uniform1iv);
bgfx::UniformHandle s_light = bgfx::createUniform("s_light", bgfx::UniformType::Uniform1iv);
bgfx::UniformHandle u_mtx = bgfx::createUniform("u_mtx", bgfx::UniformType::Uniform4x4fv);
bgfx::UniformHandle u_lightPosRadius = bgfx::createUniform("u_lightPosRadius", bgfx::UniformType::Uniform4fv);
bgfx::UniformHandle u_lightRgbInnerR = bgfx::createUniform("u_lightRgbInnerR", bgfx::UniformType::Uniform4fv);
// Create program from shaders.
bgfx::ProgramHandle geomProgram = loadProgram("vs_deferred_geom", "fs_deferred_geom");
bgfx::ProgramHandle lightProgram = loadProgram("vs_deferred_light", "fs_deferred_light");
bgfx::ProgramHandle combineProgram = loadProgram("vs_deferred_combine", "fs_deferred_combine");
bgfx::ProgramHandle debugProgram = loadProgram("vs_deferred_debug", "fs_deferred_debug");
bgfx::ProgramHandle lineProgram = loadProgram("vs_deferred_debug_line", "fs_deferred_debug_line");
// Load diffuse texture.
bgfx::TextureHandle textureColor = loadTexture("fieldstone-rgba.dds");
// Load normal texture.
bgfx::TextureHandle textureNormal = loadTexture("fieldstone-n.dds");
bgfx::TextureHandle gbufferTex[3] = { BGFX_INVALID_HANDLE, BGFX_INVALID_HANDLE, BGFX_INVALID_HANDLE };
bgfx::FrameBufferHandle gbuffer = BGFX_INVALID_HANDLE;
bgfx::FrameBufferHandle lightBuffer = BGFX_INVALID_HANDLE;
// Imgui.
imguiCreate();
const int64_t timeOffset = bx::getHPCounter();
const bgfx::RendererType::Enum renderer = bgfx::getRendererType();
const float texelHalf = bgfx::RendererType::Direct3D9 == renderer ? 0.5f : 0.0f;
s_originBottomLeft = bgfx::RendererType::OpenGL == renderer || bgfx::RendererType::OpenGLES == renderer;
// Get renderer capabilities info.
const bgfx::Caps* caps = bgfx::getCaps();
uint32_t oldWidth = 0;
uint32_t oldHeight = 0;
uint32_t oldReset = reset;
int32_t scrollArea = 0;
int32_t numLights = 512;
float lightAnimationSpeed = 0.3f;
bool animateMesh = true;
bool showScissorRects = false;
bool showGBuffer = true;
float view[16];
float initialPos[3] = { 0.0f, 0.0f, -15.0f };
cameraCreate();
cameraSetPosition(initialPos);
cameraSetVerticalAngle(0.0f);
cameraGetViewMtx(view);
entry::MouseState mouseState;
while (!entry::processEvents(width, height, debug, reset, &mouseState) )
{
int64_t now = bx::getHPCounter();
static int64_t last = now;
const int64_t frameTime = now - last;
last = now;
const double freq = double(bx::getHPFrequency() );
const double toMs = 1000.0/freq;
const float deltaTime = float(frameTime/freq);
float time = (float)( (now-timeOffset)/freq);
// Use debug font to print information about this example.
bgfx::dbgTextClear();
bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/21-deferred");
bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: MRT rendering and deferred shading.");
bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);
if (2 > caps->maxFBAttachments)
{
// When multiple render targets (MRT) is not supported by GPU,
// implement alternative code path that doesn't use MRT.
bool blink = uint32_t(time*3.0f)&1;
bgfx::dbgTextPrintf(0, 5, blink ? 0x1f : 0x01, " MRT not supported by GPU. ");
// Set view 0 default viewport.
bgfx::setViewRect(0, 0, 0, width, 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::submit(0);
}
else
{
if (oldWidth != width
|| oldHeight != height
|| oldReset != reset
|| !bgfx::isValid(gbuffer) )
{
// Recreate variable size render targets when resolution changes.
oldWidth = width;
oldHeight = height;
oldReset = reset;
if (bgfx::isValid(gbuffer) )
{
bgfx::destroyFrameBuffer(gbuffer);
}
const uint32_t samplerFlags = 0
| BGFX_TEXTURE_RT
| BGFX_TEXTURE_MIN_POINT
| BGFX_TEXTURE_MAG_POINT
| BGFX_TEXTURE_MIP_POINT
| BGFX_TEXTURE_U_CLAMP
| BGFX_TEXTURE_V_CLAMP
;
gbufferTex[0] = bgfx::createTexture2D(width, height, 1, bgfx::TextureFormat::BGRA8, samplerFlags);
gbufferTex[1] = bgfx::createTexture2D(width, height, 1, bgfx::TextureFormat::BGRA8, samplerFlags);
gbufferTex[2] = bgfx::createTexture2D(width, height, 1, bgfx::TextureFormat::D24, samplerFlags);
gbuffer = bgfx::createFrameBuffer(BX_COUNTOF(gbufferTex), gbufferTex, true);
if (bgfx::isValid(lightBuffer) )
{
bgfx::destroyFrameBuffer(lightBuffer);
}
lightBuffer = bgfx::createFrameBuffer(width, height, bgfx::TextureFormat::BGRA8, samplerFlags);
}
imguiBeginFrame(mouseState.m_mx
, mouseState.m_my
, (mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
| (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
, 0
, width
, height
);
imguiBeginScrollArea("Settings", width - width / 5 - 10, 10, width / 5, height / 3, &scrollArea);
imguiSeparatorLine();
imguiSlider("Num lights", numLights, 1, 2048);
if (imguiCheck("Show G-Buffer.", showGBuffer) )
{
showGBuffer = !showGBuffer;
}
if (imguiCheck("Show light scissor.", showScissorRects) )
{
showScissorRects = !showScissorRects;
}
if (imguiCheck("Animate mesh.", animateMesh) )
{
animateMesh = !animateMesh;
}
imguiSlider("Lights animation speed", lightAnimationSpeed, 0.0f, 0.4f, 0.01f);
imguiEndScrollArea();
imguiEndFrame();
// Update camera.
cameraUpdate(deltaTime, mouseState);
cameraGetViewMtx(view);
// Setup views
float vp[16];
float invMvp[16];
{
bgfx::setViewRect(RENDER_PASS_GEOMETRY_ID, 0, 0, width, height);
bgfx::setViewRect(RENDER_PASS_LIGHT_ID, 0, 0, width, height);
bgfx::setViewRect(RENDER_PASS_COMBINE_ID, 0, 0, width, height);
bgfx::setViewRect(RENDER_PASS_DEBUG_LIGHTS_ID, 0, 0, width, height);
bgfx::setViewRect(RENDER_PASS_DEBUG_GBUFFER_ID, 0, 0, width, height);
bgfx::setViewFrameBuffer(RENDER_PASS_LIGHT_ID, lightBuffer);
float proj[16];
mtxProj(proj, 60.0f, float(width)/float(height), 0.1f, 100.0f);
bgfx::setViewFrameBuffer(RENDER_PASS_GEOMETRY_ID, gbuffer);
bgfx::setViewTransform(RENDER_PASS_GEOMETRY_ID, view, proj);
bx::mtxMul(vp, view, proj);
bx::mtxInverse(invMvp, vp);
bx::mtxOrtho(proj, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 100.0f);
bgfx::setViewTransform(RENDER_PASS_LIGHT_ID, NULL, proj);
bgfx::setViewTransform(RENDER_PASS_COMBINE_ID, NULL, proj);
const float aspectRatio = float(height)/float(width);
const float size = 10.0f;
bx::mtxOrtho(proj, -size, size, size*aspectRatio, -size*aspectRatio, 0.0f, 1000.0f);
bgfx::setViewTransform(RENDER_PASS_DEBUG_GBUFFER_ID, NULL, proj);
bx::mtxOrtho(proj, 0.0f, (float)width, 0.0f, (float)height, 0.0f, 1000.0f);
bgfx::setViewTransform(RENDER_PASS_DEBUG_LIGHTS_ID, NULL, proj);
}
const uint32_t dim = 11;
const float offset = (float(dim-1) * 3.0f) * 0.5f;
// Draw into geometry pass.
for (uint32_t yy = 0; yy < dim; ++yy)
{
for (uint32_t xx = 0; xx < dim; ++xx)
{
float mtx[16];
if (animateMesh)
{
bx::mtxRotateXY(mtx, time*1.023f + xx*0.21f, time*0.03f + yy*0.37f);
}
else
{
bx::mtxIdentity(mtx);
}
mtx[12] = -offset + float(xx)*3.0f;
mtx[13] = -offset + float(yy)*3.0f;
mtx[14] = 0.0f;
// Set transform for draw call.
bgfx::setTransform(mtx);
// Set vertex and fragment shaders.
bgfx::setProgram(geomProgram);
// Set vertex and index buffer.
bgfx::setVertexBuffer(vbh);
bgfx::setIndexBuffer(ibh);
// Bind textures.
bgfx::setTexture(0, s_texColor, textureColor);
bgfx::setTexture(1, s_texNormal, textureNormal);
// Set render states.
bgfx::setState(0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_ALPHA_WRITE
| BGFX_STATE_DEPTH_WRITE
| BGFX_STATE_DEPTH_TEST_LESS
| BGFX_STATE_MSAA
);
// Submit primitive for rendering to view 0.
bgfx::submit(RENDER_PASS_GEOMETRY_ID);
}
}
// Draw lights into light buffer.
for (int32_t light = 0; light < numLights; ++light)
{
Sphere lightPosRadius;
float lightTime = time * lightAnimationSpeed * (sinf(light/float(numLights) * bx::piHalf ) * 0.5f + 0.5f);
lightPosRadius.m_center[0] = sinf( ( (lightTime + light*0.47f) + bx::piHalf*1.37f ) )*offset;
lightPosRadius.m_center[1] = cosf( ( (lightTime + light*0.69f) + bx::piHalf*1.49f ) )*offset;
lightPosRadius.m_center[2] = sinf( ( (lightTime + light*0.37f) + bx::piHalf*1.57f ) )*2.0f;
lightPosRadius.m_radius = 2.0f;
Aabb aabb;
sphereToAabb(aabb, lightPosRadius);
float box[8][3] =
{
{ aabb.m_min[0], aabb.m_min[1], aabb.m_min[2] },
{ aabb.m_min[0], aabb.m_min[1], aabb.m_max[2] },
{ aabb.m_min[0], aabb.m_max[1], aabb.m_min[2] },
{ aabb.m_min[0], aabb.m_max[1], aabb.m_max[2] },
{ aabb.m_max[0], aabb.m_min[1], aabb.m_min[2] },
{ aabb.m_max[0], aabb.m_min[1], aabb.m_max[2] },
{ aabb.m_max[0], aabb.m_max[1], aabb.m_min[2] },
{ aabb.m_max[0], aabb.m_max[1], aabb.m_max[2] },
};
float xyz[3];
bx::vec3MulMtxH(xyz, box[0], vp);
float minx = xyz[0];
float miny = xyz[1];
float maxx = xyz[0];
float maxy = xyz[1];
float maxz = xyz[2];
for (uint32_t ii = 1; ii < 8; ++ii)
{
bx::vec3MulMtxH(xyz, box[ii], vp);
minx = bx::fmin(minx, xyz[0]);
miny = bx::fmin(miny, xyz[1]);
maxx = bx::fmax(maxx, xyz[0]);
maxy = bx::fmax(maxy, xyz[1]);
maxz = bx::fmax(maxz, xyz[2]);
}
// Cull light if it's fully behind camera.
if (maxz >= 0.0f)
{
float x0 = bx::fclamp( (minx * 0.5f + 0.5f) * width, 0.0f, (float)width);
float y0 = bx::fclamp( (miny * 0.5f + 0.5f) * height, 0.0f, (float)height);
float x1 = bx::fclamp( (maxx * 0.5f + 0.5f) * width, 0.0f, (float)width);
float y1 = bx::fclamp( (maxy * 0.5f + 0.5f) * height, 0.0f, (float)height);
if (showScissorRects)
{
bgfx::TransientVertexBuffer tvb;
bgfx::TransientIndexBuffer tib;
if (bgfx::allocTransientBuffers(&tvb, DebugVertex::ms_decl, 4, &tib, 8) )
{
uint32_t abgr = 0x8000ff00;
DebugVertex* vertex = (DebugVertex*)tvb.data;
vertex->m_x = x0;
vertex->m_y = y0;
vertex->m_z = 0.0f;
vertex->m_abgr = abgr;
++vertex;
vertex->m_x = x1;
vertex->m_y = y0;
vertex->m_z = 0.0f;
vertex->m_abgr = abgr;
++vertex;
vertex->m_x = x1;
vertex->m_y = y1;
vertex->m_z = 0.0f;
vertex->m_abgr = abgr;
++vertex;
vertex->m_x = x0;
vertex->m_y = y1;
vertex->m_z = 0.0f;
vertex->m_abgr = abgr;
uint16_t* indices = (uint16_t*)tib.data;
*indices++ = 0;
*indices++ = 1;
*indices++ = 1;
*indices++ = 2;
*indices++ = 2;
*indices++ = 3;
*indices++ = 3;
*indices++ = 0;
bgfx::setProgram(lineProgram);
bgfx::setVertexBuffer(&tvb);
bgfx::setIndexBuffer(&tib);
bgfx::setState(0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_PT_LINES
| BGFX_STATE_BLEND_ALPHA
);
bgfx::submit(RENDER_PASS_DEBUG_LIGHTS_ID);
}
}
uint8_t val = light&7;
float lightRgbInnerR[4] =
{
val & 0x1 ? 1.0f : 0.25f,
val & 0x2 ? 1.0f : 0.25f,
val & 0x4 ? 1.0f : 0.25f,
0.8f,
};
// Draw light.
bgfx::setUniform(u_lightPosRadius, &lightPosRadius);
bgfx::setUniform(u_lightRgbInnerR, lightRgbInnerR);
bgfx::setUniform(u_mtx, invMvp);
const uint16_t scissorHeight = uint16_t(y1-y0);
bgfx::setScissor(uint16_t(x0), height-scissorHeight-uint16_t(y0), uint16_t(x1-x0), scissorHeight);
bgfx::setTexture(0, s_normal, gbuffer, 1);
bgfx::setTexture(1, s_depth, gbuffer, 2);
bgfx::setProgram(lightProgram);
bgfx::setState(0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_ALPHA_WRITE
| BGFX_STATE_BLEND_ADD
);
screenSpaceQuad( (float)width, (float)height, texelHalf, s_originBottomLeft);
bgfx::submit(RENDER_PASS_LIGHT_ID);
}
}
// Combine color and light buffers.
bgfx::setTexture(0, s_albedo, gbuffer, 0);
bgfx::setTexture(1, s_light, lightBuffer, 0);
bgfx::setProgram(combineProgram);
bgfx::setState(0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_ALPHA_WRITE
);
screenSpaceQuad( (float)width, (float)height, texelHalf, s_originBottomLeft);
bgfx::submit(RENDER_PASS_COMBINE_ID);
if (showGBuffer)
{
const float aspectRatio = float(width)/float(height);
// Draw debug GBuffer.
for (uint32_t ii = 0; ii < BX_COUNTOF(gbufferTex); ++ii)
{
float mtx[16];
bx::mtxSRT(mtx
, aspectRatio, 1.0f, 1.0f
, 0.0f, 0.0f, 0.0f
, -7.9f - BX_COUNTOF(gbufferTex)*0.1f*0.5f + ii*2.1f*aspectRatio, 4.0f, 0.0f
);
bgfx::setTransform(mtx);
bgfx::setProgram(debugProgram);
bgfx::setVertexBuffer(vbh);
bgfx::setIndexBuffer(ibh, 0, 6);
bgfx::setTexture(0, s_texColor, gbufferTex[ii]);
bgfx::setState(BGFX_STATE_RGB_WRITE);
bgfx::submit(RENDER_PASS_DEBUG_GBUFFER_ID);
}
}
}
// Advance to next frame. Rendering thread will be kicked to
// process submitted rendering primitives.
bgfx::frame();
}
// Cleanup.
cameraDestroy();
imguiDestroy();
if (bgfx::isValid(gbuffer) )
{
bgfx::destroyFrameBuffer(gbuffer);
bgfx::destroyFrameBuffer(lightBuffer);
}
bgfx::destroyIndexBuffer(ibh);
bgfx::destroyVertexBuffer(vbh);
bgfx::destroyProgram(geomProgram);
bgfx::destroyProgram(lightProgram);
bgfx::destroyProgram(combineProgram);
bgfx::destroyProgram(debugProgram);
bgfx::destroyProgram(lineProgram);
bgfx::destroyTexture(textureColor);
bgfx::destroyTexture(textureNormal);
bgfx::destroyUniform(s_texColor);
bgfx::destroyUniform(s_texNormal);
bgfx::destroyUniform(s_albedo);
bgfx::destroyUniform(s_normal);
bgfx::destroyUniform(s_depth);
bgfx::destroyUniform(s_light);
bgfx::destroyUniform(u_lightPosRadius);
bgfx::destroyUniform(u_lightRgbInnerR);
bgfx::destroyUniform(u_mtx);
// Shutdown bgfx.
bgfx::shutdown();
return 0;
}
int _main_(int /*_argc*/, char** /*_argv*/)
{
uint32_t width = 1280;
uint32_t height = 720;
uint32_t debug = BGFX_DEBUG_TEXT;
uint32_t reset = BGFX_RESET_VSYNC;
bgfx::init();
bgfx::reset(width, height, reset);
// Enable debug text.
bgfx::setDebug(debug);
// Set view 0 clear state.
bgfx::setViewClear(0
, BGFX_CLEAR_COLOR|BGFX_CLEAR_DEPTH
, 0x303030ff
, 1.0f
, 0
);
const bgfx::Caps* caps = bgfx::getCaps();
const bool computeSupported = !!(caps->supported & BGFX_CAPS_COMPUTE);
const bool indirectSupported = !!(caps->supported & BGFX_CAPS_DRAW_INDIRECT);
if (computeSupported)
{
// Imgui.
imguiCreate();
bgfx::VertexDecl quadVertexDecl;
quadVertexDecl.begin()
.add(bgfx::Attrib::Position, 2, bgfx::AttribType::Float)
.end();
// Create static vertex buffer.
bgfx::VertexBufferHandle vbh = bgfx::createVertexBuffer(
// Static data can be passed with bgfx::makeRef
bgfx::makeRef(s_quadVertices, sizeof(s_quadVertices) )
, quadVertexDecl
);
// Create static index buffer.
bgfx::IndexBufferHandle ibh = bgfx::createIndexBuffer(
// Static data can be passed with bgfx::makeRef
bgfx::makeRef(s_quadIndices, sizeof(s_quadIndices) )
);
// Create particle program from shaders.
bgfx::ProgramHandle particleProgram = loadProgram("vs_particle", "fs_particle");
// Setup compute buffers
bgfx::VertexDecl computeVertexDecl;
computeVertexDecl.begin()
.add(bgfx::Attrib::TexCoord0, 4, bgfx::AttribType::Float)
.end();
const uint32_t threadGroupUpdateSize = 512;
const uint32_t maxParticleCount = 32 * 1024;
bgfx::DynamicVertexBufferHandle currPositionBuffer0 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
bgfx::DynamicVertexBufferHandle currPositionBuffer1 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
bgfx::DynamicVertexBufferHandle prevPositionBuffer0 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
bgfx::DynamicVertexBufferHandle prevPositionBuffer1 = bgfx::createDynamicVertexBuffer(1 << 15, computeVertexDecl, BGFX_BUFFER_COMPUTE_READ_WRITE);
bgfx::UniformHandle u_params = bgfx::createUniform("u_params", bgfx::UniformType::Vec4, 3);
bgfx::ProgramHandle initInstancesProgram = bgfx::createProgram(loadShader("cs_init_instances"), true);
bgfx::ProgramHandle updateInstancesProgram = bgfx::createProgram(loadShader("cs_update_instances"), true);
bgfx::ProgramHandle indirectProgram = BGFX_INVALID_HANDLE;
bgfx::IndirectBufferHandle indirectBuffer = BGFX_INVALID_HANDLE;
if (indirectSupported)
{
indirectProgram = bgfx::createProgram(loadShader("cs_indirect"), true);
indirectBuffer = bgfx::createIndirectBuffer(2);
}
u_paramsDataStruct u_paramsData;
InitializeParams(0, &u_paramsData);
bgfx::setUniform(u_params, &u_paramsData, 3);
bgfx::setBuffer(0, prevPositionBuffer0, bgfx::Access::Write);
bgfx::setBuffer(1, currPositionBuffer0, bgfx::Access::Write);
bgfx::dispatch(0, initInstancesProgram, maxParticleCount / threadGroupUpdateSize, 1, 1);
float view[16];
float initialPos[3] = { 0.0f, 0.0f, -45.0f };
cameraCreate();
cameraSetPosition(initialPos);
cameraSetVerticalAngle(0.0f);
cameraGetViewMtx(view);
int32_t scrollArea = 0;
bool useIndirect = false;
entry::MouseState mouseState;
while (!entry::processEvents(width, height, debug, reset, &mouseState) )
{
int64_t now = bx::getHPCounter();
static int64_t last = now;
const int64_t frameTime = now - last;
last = now;
const double freq = double(bx::getHPFrequency() );
const float deltaTime = float(frameTime/freq);
if (deltaTime > 1000.0)
{
abort();
}
// Set view 0 default viewport.
bgfx::setViewRect(0, 0, 0, width, height);
// Use debug font to print information about this example.
bgfx::dbgTextClear();
bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/24-nbody");
bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: N-body simulation with compute shaders using buffers.");
imguiBeginFrame(mouseState.m_mx
, mouseState.m_my
, (mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
| (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
, mouseState.m_mz
, width
, height
);
imguiBeginScrollArea("Settings", width - width / 4 - 10, 10, width / 4, 500, &scrollArea);
imguiSlider("Random seed", u_paramsData.baseSeed, 0, 100);
int32_t shape = imguiChoose(u_paramsData.initialShape, "Point", "Sphere", "Box", "Donut");
imguiSlider("Initial speed", u_paramsData.initialSpeed, 0.0f, 300.0f, 0.1f);
bool defaults = imguiButton("Reset");
imguiSeparatorLine();
imguiSlider("Particle count (x512)", u_paramsData.dispatchSize, 1, 64);
imguiSlider("Gravity", u_paramsData.gravity, 0.0f, 0.3f, 0.001f);
imguiSlider("Damping", u_paramsData.damping, 0.0f, 1.0f, 0.01f);
imguiSlider("Max acceleration", u_paramsData.maxAccel, 0.0f, 100.0f, 0.01f);
imguiSlider("Time step", u_paramsData.timeStep, 0.0f, 0.02f, 0.0001f);
imguiSeparatorLine();
imguiSlider("Particle intensity", u_paramsData.particleIntensity, 0.0f, 1.0f, 0.001f);
imguiSlider("Particle size", u_paramsData.particleSize, 0.0f, 1.0f, 0.001f);
imguiSlider("Particle power", u_paramsData.particlePower, 0.001f, 16.0f, 0.01f);
imguiSeparatorLine();
if (imguiCheck("Use draw/dispatch indirect", useIndirect, indirectSupported) )
{
useIndirect = !useIndirect;
}
imguiEndScrollArea();
imguiEndFrame();
// Modify parameters and reset if shape is changed
if (shape != u_paramsData.initialShape)
{
defaults = true;
InitializeParams(shape, &u_paramsData);
}
if (defaults)
{
bgfx::setBuffer(0, prevPositionBuffer0, bgfx::Access::Write);
bgfx::setBuffer(1, currPositionBuffer0, bgfx::Access::Write);
bgfx::setUniform(u_params, &u_paramsData, 3);
bgfx::dispatch(0, initInstancesProgram, maxParticleCount / threadGroupUpdateSize, 1, 1);
}
if (useIndirect)
{
bgfx::setUniform(u_params, &u_paramsData, 3);
bgfx::setBuffer(0, indirectBuffer, bgfx::Access::Write);
bgfx::dispatch(0, indirectProgram);
}
bgfx::setBuffer(0, prevPositionBuffer0, bgfx::Access::Read);
bgfx::setBuffer(1, currPositionBuffer0, bgfx::Access::Read);
bgfx::setBuffer(2, prevPositionBuffer1, bgfx::Access::Write);
bgfx::setBuffer(3, currPositionBuffer1, bgfx::Access::Write);
bgfx::setUniform(u_params, &u_paramsData, 3);
if (useIndirect)
{
bgfx::dispatch(0, updateInstancesProgram, indirectBuffer, 1);
}
else
{
bgfx::dispatch(0, updateInstancesProgram, u_paramsData.dispatchSize, 1, 1);
}
bx::xchg(currPositionBuffer0, currPositionBuffer1);
bx::xchg(prevPositionBuffer0, prevPositionBuffer1);
// Update camera.
cameraUpdate(deltaTime, mouseState);
cameraGetViewMtx(view);
// Set view and projection matrix for view 0.
const bgfx::HMD* hmd = bgfx::getHMD();
if (NULL != hmd && 0 != (hmd->flags & BGFX_HMD_RENDERING) )
{
float viewHead[16];
float eye[3] = {};
bx::mtxQuatTranslationHMD(viewHead, hmd->eye[0].rotation, eye);
float tmp[16];
bx::mtxMul(tmp, view, viewHead);
float proj[16];
bx::mtxProj(proj, hmd->eye[0].fov, 0.1f, 10000.0f);
bgfx::setViewTransform(0, tmp, proj);
// Set view 0 default viewport.
//
// Use HMD's width/height since HMD's internal frame buffer size
// might be much larger than window size.
bgfx::setViewRect(0, 0, 0, hmd->width, hmd->height);
}
else
{
float proj[16];
bx::mtxProj(proj, 90.0f, float(width)/float(height), 0.1f, 10000.0f);
bgfx::setViewTransform(0, view, proj);
// Set view 0 default viewport.
bgfx::setViewRect(0, 0, 0, width, height);
}
// Set vertex and index buffer.
bgfx::setVertexBuffer(vbh);
bgfx::setIndexBuffer(ibh);
bgfx::setInstanceDataBuffer(currPositionBuffer0, 0, u_paramsData.dispatchSize * threadGroupUpdateSize);
// Set render states.
bgfx::setState(0
| BGFX_STATE_RGB_WRITE
| BGFX_STATE_BLEND_ADD
| BGFX_STATE_DEPTH_TEST_ALWAYS
);
// Submit primitive for rendering to view 0.
if (useIndirect)
{
bgfx::submit(0, particleProgram, indirectBuffer, 0);
}
else
{
bgfx::submit(0, particleProgram);
}
// Advance to next frame. Rendering thread will be kicked to
// process submitted rendering primitives.
bgfx::frame();
}
// Cleanup.
cameraDestroy();
imguiDestroy();
if (indirectSupported)
{
bgfx::destroyProgram(indirectProgram);
bgfx::destroyIndirectBuffer(indirectBuffer);
}
bgfx::destroyUniform(u_params);
bgfx::destroyDynamicVertexBuffer(currPositionBuffer0);
bgfx::destroyDynamicVertexBuffer(currPositionBuffer1);
bgfx::destroyDynamicVertexBuffer(prevPositionBuffer0);
bgfx::destroyDynamicVertexBuffer(prevPositionBuffer1);
bgfx::destroyProgram(updateInstancesProgram);
bgfx::destroyProgram(initInstancesProgram);
bgfx::destroyIndexBuffer(ibh);
bgfx::destroyVertexBuffer(vbh);
bgfx::destroyProgram(particleProgram);
}
else
{
int64_t timeOffset = bx::getHPCounter();
entry::MouseState mouseState;
while (!entry::processEvents(width, height, debug, reset, &mouseState) )
{
int64_t now = bx::getHPCounter();
float time = (float)( (now - timeOffset)/double(bx::getHPFrequency() ) );
bgfx::setViewRect(0, 0, 0, width, height);
bgfx::dbgTextClear();
bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/24-nbody");
bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: N-body simulation with compute shaders using buffers.");
bool blink = uint32_t(time*3.0f)&1;
bgfx::dbgTextPrintf(0, 5, blink ? 0x1f : 0x01, " Compute is not supported by GPU. ");
bgfx::touch(0);
bgfx::frame();
}
}
// Shutdown bgfx.
bgfx::shutdown();
return 0;
}
