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VK9 - Milestone13 Completed

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VK9 has reached it's 12th and 13th milestones. Reaching these milestones required the addition of limited lighting support and significant improvements to the texture stage support. The variables used for texture stages are now handled with specialization constants. What this means is that although they exist in the SPIR-V they should be optimized away when the SPIR-V is compiled into GPU instructions. This approach means that the GPU should only be running relevant code for fixed function. As part of initial lighting support both the light structures and material structure are available to the shaders being used to handle fixed function.