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Use correct chroma co-siting offsets in Metal

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This commit is contained in:
Cameron Gutman 2025-11-04 23:51:39 -06:00
commit 181dba5864
2 changed files with 18 additions and 20 deletions
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14
app/shaders/vt_renderer.metal
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@ -26,8 +26,8 @@ fragment float4 ps_draw_biplanar(Vertex v [[ stage_in ]],
texture2d<float> luminancePlane [[ texture(0) ]],
texture2d<float> chrominancePlane [[ texture(1) ]])
{
float2 chromaOffset = float2(cscParams.chromaOffset.x / chrominancePlane.get_width(),
cscParams.chromaOffset.y / chrominancePlane.get_height());
float2 chromaOffset = float2(cscParams.chromaOffset.x / luminancePlane.get_width(),
cscParams.chromaOffset.y / luminancePlane.get_height());
float3 yuv = float3(luminancePlane.sample(s, v.texCoords).r,
chrominancePlane.sample(s, v.texCoords + chromaOffset).rg);
yuv *= cscParams.bitnessScaleFactor;
@ -46,13 +46,11 @@ fragment float4 ps_draw_triplanar(Vertex v [[ stage_in ]],
texture2d<float> chrominancePlaneU [[ texture(1) ]],
texture2d<float> chrominancePlaneV [[ texture(2) ]])
{
float2 chromaOffsetU = float2(cscParams.chromaOffset.x / chrominancePlaneU.get_width(),
cscParams.chromaOffset.y / chrominancePlaneU.get_height());
float2 chromaOffsetV = float2(cscParams.chromaOffset.x / chrominancePlaneV.get_width(),
cscParams.chromaOffset.y / chrominancePlaneV.get_height());
float2 chromaOffset = float2(cscParams.chromaOffset.x / luminancePlane.get_width(),
cscParams.chromaOffset.y / luminancePlane.get_height());
float3 yuv = float3(luminancePlane.sample(s, v.texCoords).r,
chrominancePlaneU.sample(s, v.texCoords + chromaOffsetU).r,
chrominancePlaneV.sample(s, v.texCoords + chromaOffsetV).r);
chrominancePlaneU.sample(s, v.texCoords + chromaOffset).r,
chrominancePlaneV.sample(s, v.texCoords + chromaOffset).r);
yuv *= cscParams.bitnessScaleFactor;
yuv -= cscParams.offsets;