0c9433bf44
OpenGL uses a depth range between -1 and 1, which is then normalized. Metal & Vulkan uses a depth range between 0 and 1, which is already normalized. The final plan would be to default to a depth range between 0 and 1, but for now the depth ranges are retargetted so they won't be clipped away. This solves the next issues for users: - Navigate control will be rendered correctly - Ortographic view clipping artifacts - EEVEE light evaluation Retargetting happens at the end of the vertex stage or when a geometry stage is present at the end of the geometry stage. Derivatives using depth would have a different value compared to OpenGL, but would match Metal backend. OpenGL performs clipping and generates derivatives based on the original depth value. `gl_FragCoord` and clipping would have some precision differences as clipping and normalizing are done in a different order but would match Metal. Geometry shaders should use `gpu_EmitVertex` to ensure that the retargetting is done per vertex. Pull Request: https://projects.blender.org/blender/blender/pulls/114669
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