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Use proper UV in cubemap downsampler raster

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This removes bias in cubemap downsampling shader that resulted in the bottom of cubemaps being over represented

(cherry picked from commit fb77021559)
This commit is contained in:
clayjohn 2023-05-03 01:06:34 -07:00 committed by Rémi Verschelde
parent e68e2fad25
commit 2435c9426d
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GPG Key ID: C3336907360768E1
1 changed files with 98 additions and 100 deletions
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12
servers/rendering/renderer_rd/shaders/effects/cubemap_downsampler_raster.glsl
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@ -55,15 +55,14 @@ void main() {
// Converted from compute shader which uses absolute coordinates.
// Could possibly simplify this
float face_size = float(params.face_size);
if (uv_interp.x < face_size && uv_interp.y < face_size) {
float inv_face_size = 1.0 / face_size;
vec2 id = floor(uv_interp);
float u0 = (uv_interp.x * 2.0 + 1.0 - 0.75) * inv_face_size - 1.0;
float u1 = (uv_interp.x * 2.0 + 1.0 + 0.75) * inv_face_size - 1.0;
float u1 = (id.x * 2.0 + 1.0 + 0.75) * inv_face_size - 1.0;
float u0 = (id.x * 2.0 + 1.0 - 0.75) * inv_face_size - 1.0;
float v0 = (uv_interp.y * 2.0 + 1.0 - 0.75) * -inv_face_size + 1.0;
float v1 = (uv_interp.y * 2.0 + 1.0 + 0.75) * -inv_face_size + 1.0;
float v0 = (id.y * 2.0 + 1.0 - 0.75) * -inv_face_size + 1.0;
float v1 = (id.y * 2.0 + 1.0 + 0.75) * -inv_face_size + 1.0;
float weights[4];
weights[0] = calcWeight(u0, v0);
@ -159,5 +158,4 @@ void main() {
break;
}
frag_color = color;
}
}