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Vulkan: stop mirroring light shafts top to bottom (#8006)

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The Vulkan light shaft pass reuses OpenGL's sun position formula, whose
texture V grows upward. The Vulkan fullscreen triangle in post-v.sdr has
V = 0 at the top of the screen, and ls-f.sdr steps from fragTexCoord
toward sun_pos in that space, so the shafts radiated from a point mirrored
vertically from the sun. Flip the vertical coordinate before upload.

Co-authored-by: Saga port <saga-port@invalid>
Co-authored-by: Claude Opus 5.5 <[email protected]>
This commit is contained in:
AdmiralTolwynSaga portClaude Opus 5.5
 authored and GitHub committed 2026-11-06 20:32:01 +00:00
1 parent 1d0dd687cd
commit 2b1759e98e
1 file changed
+3
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code/graphics/vulkan/VulkanPostProcessingLDR.cpp
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@@ -531,6 +531,9 @@ void VulkanLDR::executeLightshafts(vk::CommandBuffer cmd)
if (dot > 0.7f) {
sun_x = asinf_safe(vm_vec_dot(&light_dir, &Eye_matrix.vec.rvec)) / PI * 1.5f + 0.5f;
sun_y = asinf_safe(vm_vec_dot(&light_dir, &Eye_matrix.vec.uvec)) / PI * 1.5f * gr_screen.clip_aspect + 0.5f;
// The formula above is OpenGL's, whose texture V grows upward. The Vulkan fullscreen triangle in
// post-v.sdr has V = 0 at the top of the screen, so flip to the space ls-f.sdr's fragTexCoord is in.
sun_y = 1.0f - sun_y;
found = true;
break;
}