Added framebuffer readback to CommandBufferSubmit test.

tests/Testbed/TestCommandBufferSubmit.cpp

@@ -10,19 +10,38 @@
 
 DEF_TEST( CommandBufferSubmit )
 {
- // Create multi-submit command buffers
  constexpr unsigned maxNumCmdBuffers = 2;
+
  static CommandBuffer* multiSubmitCmdBuffers[maxNumCmdBuffers] = {};
+ static Texture* framebufferResultTex;
 
  const unsigned numCmdBuffers = swapChain->GetNumSwapBuffers();
 
+ const ClearValue clearValues[] =
+ {
+ ClearValue{ 0.2f, 1.0f, 0.2f, 1 },
+ ClearValue{ 0.2f, 0.4f, 0.8f, 1 }
+ };
+
+ const TextureRegion texRegion{ Offset3D{ 0, 0, 0 }, Extent3D{ 1, 1, 1 } };
+
  if (frame == 0)
  {
- const ClearValue clearValues[] =
+ // Create 1x1 texture for framebuffer result (i.e. to read a single pixel)
+ const std::uint8_t initialImageData[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
+ SrcImageDescriptor initialImage;
  {
- ClearValue{ 0.2f, 1.0f, 0.2f, 1 },
- ClearValue{ 0.2f, 0.4f, 0.8f, 1 }
- };
+ initialImage.data = initialImageData;
+ initialImage.dataSize = sizeof(initialImageData);
+ }
+ TextureDescriptor texDesc;
+ {
+ texDesc.bindFlags = BindFlags::Sampled | BindFlags::CopyDst;
+ texDesc.format = swapChain->GetColorFormat();
+ }
+ framebufferResultTex = renderer->CreateTexture(texDesc, &initialImage);
+
+ // Create multi-submit command buffers
  constexpr unsigned numClearValues = sizeof(clearValues)/sizeof(clearValues[0]);
 
  CommandBufferDescriptor cmdBufferDesc;
@@ -36,6 +55,7 @@ DEF_TEST( CommandBufferSubmit )
  {
  cmdBuf->BeginRenderPass(*swapChain, nullptr, 0, nullptr, swapBufferIndex % numCmdBuffers);
  cmdBuf->Clear(ClearFlags::Color, clearValues[swapBufferIndex % numClearValues]);
+ cmdBuf->CopyTextureFromFramebuffer(*framebufferResultTex, texRegion, Offset2D{ 0, 0 });
  cmdBuf->EndRenderPass();
  }
  cmdBuf->End();
@@ -58,9 +78,33 @@ DEF_TEST( CommandBufferSubmit )
  // Submit command buffers several times
  cmdQueue->Submit(*multiSubmitCmdBuffers[swapBufferIndex]);
 
- // Read swap chain color
- //TODO
- //std::this_thread::sleep_for(std::chrono::milliseconds(100));
+ // Read framebuffer pixel value from intermediate texture
+ std::uint8_t framebufferResult[4] = {};
+ DstImageDescriptor framebufferResultDesc;
+ {
+ framebufferResultDesc.data = framebufferResult;
+ framebufferResultDesc.dataSize = sizeof(framebufferResult);
+ }
+ renderer->ReadTexture(*framebufferResultTex, texRegion, framebufferResultDesc);
+
+ const std::uint8_t expectedResult[4] =
+ {
+ static_cast<std::uint8_t>(clearValues[swapBufferIndex].color[0] * 255.0f),
+ static_cast<std::uint8_t>(clearValues[swapBufferIndex].color[1] * 255.0f),
+ static_cast<std::uint8_t>(clearValues[swapBufferIndex].color[2] * 255.0f),
+ static_cast<std::uint8_t>(clearValues[swapBufferIndex].color[3] * 255.0f),
+ };
+
+ if (::memcmp(framebufferResult, expectedResult, sizeof(framebufferResult)) != 0)
+ {
+ Log::Errorf(
+ "Mismatch between framebuffer[%u] color [%02X %02X %02X %02X] and clear value [%02X %02X %02X %02X]\n",
+ swapBufferIndex,
+ framebufferResult[0], framebufferResult[1], framebufferResult[2], framebufferResult[3],
+ expectedResult[0], expectedResult[1], expectedResult[2], expectedResult[3]
+ );
+ return TestResult::FailedMismatch;
+ }
 
  return TestResult::Continue;
  }
@@ -69,6 +113,7 @@ DEF_TEST( CommandBufferSubmit )
  // Delete old command buffers
  for (auto* cmdBuf : multiSubmitCmdBuffers)
  renderer->Release(*cmdBuf);
+ renderer->Release(*framebufferResultTex);
 
  return TestResult::Passed;
  }