/// <summary>
/// Begin a renderpass without clearing color or depth.
/// </summary>
public void BeginRenderPass(RenderPass renderPass, FrameBuffer frameBuffer, bool useSecondaryCommandBuffers)
{
CheckBegun();
CheckNotInRenderPass();
//FixedArray2<VkClearValue> clearValues = new FixedArray2<VkClearValue>();
//clearValues.First.color = new VkClearColorValue(0, 0, 0);
//clearValues.Second.depthStencil = new VkClearDepthStencilValue() { depth = 1.0f, stencil = 0 };
VkRenderPassBeginInfo renderPassBeginInfo = Initializers.renderPassBeginInfo();
renderPassBeginInfo.renderPass = renderPass.vkRenderPass;
renderPassBeginInfo.renderArea.offset.x = 0;
renderPassBeginInfo.renderArea.offset.y = 0;
renderPassBeginInfo.renderArea.extent.width = frameBuffer.swapchain.width;
renderPassBeginInfo.renderArea.extent.height = frameBuffer.swapchain.height;
//renderPassBeginInfo.clearValueCount = 2;
//renderPassBeginInfo.pClearValues = &clearValues.First;
renderPassBeginInfo.framebuffer = frameBuffer.vkFrameBuffer;
renderPassUseSecondaryBuffers = useSecondaryCommandBuffers;
VkSubpassContents subPassContents = useSecondaryCommandBuffers
? VkSubpassContents.SecondaryCommandBuffers
: VkSubpassContents.Inline;
vkCmdBeginRenderPass(vkCmd, &renderPassBeginInfo, subPassContents);
VkViewport viewport = Initializers.viewport((float)frameBuffer.swapchain.width, (float)frameBuffer.swapchain.height, 0.0f, 1.0f);
vkCmdSetViewport(vkCmd, 0, 1, &viewport);
VkRect2D scissor = Initializers.rect2D(frameBuffer.swapchain.width, frameBuffer.swapchain.height, 0, 0);
vkCmdSetScissor(vkCmd, 0, 1, &scissor);
inRenderPass = true;
}