FShaderResourceViewRHIRef FOpenGLDynamicRHI::RHICreateShaderResourceView(FVertexBufferRHIParamRef VertexBufferRHI, uint32 Stride, uint8 Format)
{
GLuint TextureID = 0;
if ( FOpenGL::SupportsResourceView() )
{
DYNAMIC_CAST_OPENGLRESOURCE(VertexBuffer,VertexBuffer);
const uint32 FormatBPP = GPixelFormats[Format].BlockBytes;
if (FormatBPP != Stride)
{
UE_LOG(LogRHI, Fatal,TEXT("OpenGL 3.2 RHI supports only tightly packed texture buffers!"));
return new FOpenGLShaderResourceView(this, 0, GL_TEXTURE_BUFFER);
}
const FOpenGLTextureFormat& GLFormat = GOpenGLTextureFormats[Format];
FOpenGL::GenTextures(1,&TextureID);
// Use a texture stage that's not likely to be used for draws, to avoid waiting
CachedSetupTextureStage(GetContextStateForCurrentContext(), FOpenGL::GetMaxCombinedTextureImageUnits() - 1, GL_TEXTURE_BUFFER, TextureID, -1, 1);
FOpenGL::TexBuffer(GL_TEXTURE_BUFFER, GLFormat.InternalFormat[0], VertexBuffer->Resource);
}
// No need to restore texture stage; leave it like this,
// and the next draw will take care of cleaning it up; or
// next operation that needs the stage will switch something else in on it.
return new FOpenGLShaderResourceView(this,TextureID,GL_TEXTURE_BUFFER);
}
void FOpenGLDynamicRHI::RHIResizeViewport(FViewportRHIParamRef ViewportRHI,uint32 SizeX,uint32 SizeY,bool bIsFullscreen)
{
DYNAMIC_CAST_OPENGLRESOURCE(Viewport,Viewport);
check( IsInGameThread() );
//#if !PLATFORM_MAC
// SCOPED_SUSPEND_RENDERING_THREAD(true);
//#endif
Viewport->Resize(SizeX,SizeY,bIsFullscreen);
}
void FOpenGLDynamicRHI::RHIBeginDrawingViewport(FViewportRHIParamRef ViewportRHI, FTextureRHIParamRef RenderTarget)
{
VERIFY_GL_SCOPE();
DYNAMIC_CAST_OPENGLRESOURCE(Viewport,Viewport);
SCOPE_CYCLE_COUNTER(STAT_OpenGLPresentTime);
check(!DrawingViewport);
DrawingViewport = Viewport;
bRevertToSharedContextAfterDrawingViewport = false;
EOpenGLCurrentContext CurrentContext = PlatformOpenGLCurrentContext( PlatformDevice );
if( CurrentContext != CONTEXT_Rendering )
{
check(CurrentContext == CONTEXT_Shared);
check(!bIsRenderingContextAcquired || !GUseThreadedRendering);
bRevertToSharedContextAfterDrawingViewport = true;
PlatformRenderingContextSetup(PlatformDevice);
}
if(!GPUProfilingData.FrameTiming.IsInitialized())
{
GPUProfilingData.FrameTiming.InitResource();
}
// Set the render target and viewport.
if( RenderTarget )
{
FRHIRenderTargetView RTV(RenderTarget);
RHISetRenderTargets(1, &RTV, FTextureRHIRef(), 0, NULL);
}
else
{
FRHIRenderTargetView RTV(DrawingViewport->GetBackBuffer());
RHISetRenderTargets(1, &RTV, FTextureRHIRef(), 0, NULL);
}
}
FOpenGLVertexBufferUnorderedAccessView::FOpenGLVertexBufferUnorderedAccessView( FOpenGLDynamicRHI* InOpenGLRHI, FVertexBufferRHIParamRef InVertexBufferRHI, uint8 Format):
VertexBufferRHI(InVertexBufferRHI),
OpenGLRHI(InOpenGLRHI)
{
VERIFY_GL_SCOPE();
DYNAMIC_CAST_OPENGLRESOURCE(VertexBuffer, InVertexBuffer);
const FOpenGLTextureFormat& GLFormat = GOpenGLTextureFormats[Format];
GLuint TextureID = 0;
FOpenGL::GenTextures(1,&TextureID);
// Use a texture stage that's not likely to be used for draws, to avoid waiting
OpenGLRHI->CachedSetupTextureStage(OpenGLRHI->GetContextStateForCurrentContext(), FOpenGL::GetMaxCombinedTextureImageUnits() - 1, GL_TEXTURE_BUFFER, TextureID, -1, 1);
FOpenGL::TexBuffer(GL_TEXTURE_BUFFER, GLFormat.InternalFormat[0], InVertexBuffer->Resource);
// No need to restore texture stage; leave it like this,
// and the next draw will take care of cleaning it up; or
// next operation that needs the stage will switch something else in on it.
this->Resource = TextureID;
this->Format = GLFormat.InternalFormat[0];
}
FTexture2DRHIRef FOpenGLDynamicRHI::RHIGetViewportBackBuffer(FViewportRHIParamRef ViewportRHI)
{
DYNAMIC_CAST_OPENGLRESOURCE(Viewport,Viewport);
return Viewport->GetBackBuffer();
}
void FOpenGLDynamicRHI::RHIEndDrawingViewport(FViewportRHIParamRef ViewportRHI,bool bPresent,bool bLockToVsync)
{
VERIFY_GL_SCOPE();
DYNAMIC_CAST_OPENGLRESOURCE(Viewport,Viewport);
SCOPE_CYCLE_COUNTER(STAT_OpenGLPresentTime);
check(DrawingViewport.GetReference() == Viewport);
FOpenGLTexture2D* BackBuffer = Viewport->GetBackBuffer();
uint32 IdleStart = FPlatformTime::Cycles();
PlatformBlitToViewport(PlatformDevice,
Viewport->OpenGLContext,
BackBuffer->GetSizeX(),
BackBuffer->GetSizeY(),
bPresent,
bLockToVsync,
RHIOpenGLConsoleVariables::SyncInterval
);
DrawingViewport = NULL;
// Don't wait on the GPU when using SLI, let the driver determine how many frames behind the GPU should be allowed to get
if (GNumActiveGPUsForRendering == 1)
{
static const auto CFinishFrameVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.FinishCurrentFrame"));
if (!CFinishFrameVar->GetValueOnRenderThread())
{
// Wait for the GPU to finish rendering the previous frame before finishing this frame.
Viewport->WaitForFrameEventCompletion();
Viewport->IssueFrameEvent();
}
else
{
// Finish current frame immediately to reduce latency
Viewport->IssueFrameEvent();
Viewport->WaitForFrameEventCompletion();
}
// If the input latency timer has been triggered, block until the GPU is completely
// finished displaying this frame and calculate the delta time.
if ( GInputLatencyTimer.RenderThreadTrigger )
{
Viewport->WaitForFrameEventCompletion();
uint32 EndTime = FPlatformTime::Cycles();
GInputLatencyTimer.DeltaTime = EndTime - GInputLatencyTimer.StartTime;
GInputLatencyTimer.RenderThreadTrigger = false;
}
}
GRenderThreadIdle[ERenderThreadIdleTypes::WaitingForGPUPresent] += FPlatformTime::Cycles() - IdleStart;
if (bRevertToSharedContextAfterDrawingViewport)
{
PlatformSharedContextSetup(PlatformDevice);
bRevertToSharedContextAfterDrawingViewport = false;
}
}
FUnorderedAccessViewRHIRef FOpenGLDynamicRHI::RHICreateUnorderedAccessView(FTextureRHIParamRef TextureRHI)
{
DYNAMIC_CAST_OPENGLRESOURCE(Texture,Texture);
check(Texture->GetFlags() & TexCreate_UAV);
return new FOpenGLTextureUnorderedAccessView(TextureRHI);
}
FUnorderedAccessViewRHIRef FOpenGLDynamicRHI::RHICreateUnorderedAccessView(FStructuredBufferRHIParamRef StructuredBufferRHI, bool bUseUAVCounter, bool bAppendBuffer)
{
DYNAMIC_CAST_OPENGLRESOURCE(StructuredBuffer,StructuredBuffer);
UE_LOG(LogRHI, Fatal,TEXT("%s not implemented yet"),ANSI_TO_TCHAR(__FUNCTION__));
return new FOpenGLUnorderedAccessView();
}
FShaderResourceViewRHIRef FOpenGLDynamicRHI::RHICreateShaderResourceView(FStructuredBufferRHIParamRef StructuredBufferRHI)
{
DYNAMIC_CAST_OPENGLRESOURCE(StructuredBuffer,StructuredBuffer);
UE_LOG(LogRHI, Fatal,TEXT("OpenGL RHI doesn't support RHICreateShaderResourceView yet!"));
return new FOpenGLShaderResourceView(this,0,GL_TEXTURE_BUFFER);
}
FUnorderedAccessViewRHIRef FOpenGLDynamicRHI::RHICreateUnorderedAccessView(FVertexBufferRHIParamRef VertexBufferRHI,uint8 Format)
{
DYNAMIC_CAST_OPENGLRESOURCE(VertexBuffer,VertexBuffer);
return new FOpenGLVertexBufferUnorderedAccessView(this, VertexBufferRHI, Format);
}
