Method OnDrawFrame

examples/Cpp/ClothPhysics/Example.cpp:578–646

    }

    void OnDrawFrame() override
    {
        UpdateScene();

        // Record and submit compute commands
        commands->Begin();
        {
            // Update scene state constant buffer
            commands->UpdateBuffer(*constantBuffer, 0, &sceneState, sizeof(sceneState));

            // Run compute shader to apply particle forces
            commands->PushDebugGroup("CSForces");
            {
                commands->SetPipelineState(*computePipelines[CSForces]);
                commands->SetResourceHeap(*computeResourceHeap, swapBufferIndex);
                commands->Dispatch(clothSegmentsU + 1, clothSegmentsV + 1, 1);
            }
            commands->PopDebugGroup();

            // Run compute shader to apply stretch constraints with number of integration steps
            commands->PushDebugGroup("CSStretchConstraints");
            {
                commands->SetPipelineState(*computePipelines[CSStretchConstraints]);

                for (std::uint32_t i = 0; i < numSolverIterations; ++i)
                {
                    if (i > 0)
                        swapBufferIndex = (swapBufferIndex + 1) % 2;
                    commands->SetResourceHeap(*computeResourceHeap, swapBufferIndex);
                    commands->Dispatch(clothSegmentsU + 1, clothSegmentsV + 1, 1);
                }
            }
            commands->PopDebugGroup();

            // Run compute shader to adjust velocity of particles
            commands->PushDebugGroup("CSRelaxation");
            {
                commands->SetPipelineState(*computePipelines[CSRelaxation]);
                commands->SetResourceHeap(*computeResourceHeap, swapBufferIndex);
                commands->Dispatch(clothSegmentsU + 1, clothSegmentsV + 1, 1);
            }
            commands->PopDebugGroup();

            // Draw scene
            commands->BeginRenderPass(*swapChain);
            {
                // Clear color buffer and set viewport
                commands->Clear(LLGL::ClearFlags::ColorDepth, backgroundColor);
                commands->SetViewport(swapChain->GetResolution());

                // Set vertex and index buffers
                #ifdef ENABLE_STORAGE_TEXTURES
                commands->SetVertexBuffer(*vertexBufferNull);
                #else
                commands->SetVertexBufferArray(*vertexBufferArray);
                #endif

                commands->SetIndexBuffer(*indexBuffer);