Kelsi 793c2b5611 fix: remove incorrect Y-flip in postprocess vertex shader ...

postprocess.vert.glsl had `TexCoord.y = 1.0 - TexCoord.y` which
inverted the vertical sampling of the scene texture.  Vulkan textures
use v=0 at the top, matching framebuffer row 0, so no flip is needed.
The camera already flips the projection matrix (mat[1][1] *= -1) so
the scene is rendered correctly oriented; the extra inversion in the
postprocess pass flipped FXAA output upside down.

Fixes: FXAA shows camera upside down
Also fixes: FSR1 upscale and FSR3 sharpen passes (same vertex shader)

2026-03-12 21:52:00 -07:00

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