yuv2rgb: correctly center uv based on bpp

2022-11-10 09:02:29 -08:00
parent 435971c623
commit de8d50eab0
1 changed files with 10 additions and 5 deletions
@@ -36,9 +36,18 @@ void main()

  // Pixels will have come in aligned to 16-bit regardless of their actual bit depth, so they must
  // be scaled as if they were actually 16-bit
-  if (bits_per_pixel == 10) {
+  if (bits_per_pixel == 8) {
+    // Convert 0.0-1.0 to -0.5-0.5
+    yuv.gb -= (128.0/255.0);
+  } else if (bits_per_pixel == 10) {
+    // Convert 0.0-1.0 to -0.5-0.5
+    yuv.gb -= (512.0/1023.0);
+
    yuv *= 64.0;
  } else if (bits_per_pixel == 12) {
+    // Convert 0.0-1.0 to -0.5-0.5
+    yuv.gb -= (2048.0/4095.0);
+
    yuv *= 16.0;
  }

@@ -46,10 +55,6 @@ void main()
  yuv.r -= 0.0625; // 16/256
  yuv.r *= 1.1643; // 255/219

-  // Convert 0.0-1.0 to -0.5-0.5
-  yuv.g = yuv.g - 0.5;
-  yuv.b = yuv.b - 0.5;
-
  // Use coefficients to weigh YUV into RGB
  vec4 rgba;
  rgba.r = yuv.r + yuv_crv * yuv.b;