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docs: Add opengl/vulkan diff

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Florian RICHER 2025-05-29 16:08:41 +02:00
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# Difference between Vulkan and OpenGL
Viewport:
- Y axis is flipped like D3D
- Clipped Z axis is not [-1; 1] but [0; 1]
![normalized viewport coordinates](./images/normalized_device_coordinates.svg)
![coord_sys](./images/coord_sys.png)
See: [Vulkan Tutorial (Vertex step)](https://vulkan-tutorial.com/Drawing_a_triangle/Graphics_pipeline_basics/Shader_modules) and [VK_KHR_maintenance1 (Allow negative height)](https://registry.khronos.org/vulkan/specs/latest/man/html/VK_KHR_maintenance1.html#_description)