Implement support for conservative rasterization.#191
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Describe the pull request
This PR implements support for conservative rasterization. In Vulkan, this is done through the
VK_EXT_conservative_rasterizationextension. It allows finer control over the rasterizer state, compared to DirectX 12, which only supports overestimation mode.In the engine, turning on conservative rasterization requires the device to be initialized with the new
GraphicsDeviceFeatures::ConservativeRasterizationfeature enabled. Afterwards, it is possible to enable theIRasterizer::conservativeRasterizationsetting to initialize a pipeline with conservative rasterization in overestimation mode. Underestimation is still supported using theSV_InnerCoveragesemantic, which translates toFullyCoveredEXTin Vulkan. The engine implements the necessary settings to use all of those features. There are tests for each backend demonstrating their usage.