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Porting ETC1S colorspace very rare calculation overflow fix into OpenCL program

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This commit is contained in:
Richard Geldreich
2025-11-18 17:38:20 -05:00
parent 5a1ae5d65d
commit d7ef7030a0
2 changed files with 3788 additions and 1466 deletions
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35
bin/ocl_kernels.cl
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@@ -72,40 +72,18 @@ uint color_distance(bool perceptual, color_rgba e1, color_rgba e2, bool alpha)
{
if (perceptual)
{
#if 0
float3 delta_rgb = (float3)(e1.x - e2.x, e1.y - e2.y, e1.z - e2.z);
float3 delta_ycbcr;
delta_ycbcr.x = dot(delta_rgb, (float3)(.2126f, .7152f, .0722f)); // y
delta_ycbcr.y = delta_rgb.x - delta_ycbcr.x; // cr
delta_ycbcr.z = delta_rgb.z - delta_ycbcr.x; // cb
delta_ycbcr *= delta_ycbcr;
float d = dot(delta_ycbcr, (float3)(1.0f, 0.203125f, 0.0234375f));
if (alpha)
{
int delta_a = e1.w - e2.w;
d += delta_a * delta_a;
}
d = clamp(d * 256.0f + .5f, 0.0f, (float)UINT32_MAX);
return (uint)(d);
#else
// This matches the CPU code, which is useful for testing.
int dr = e1.x - e2.x;
int dg = e1.y - e2.y;
int db = e1.z - e2.z;
int delta_l = dr * 27 + dg * 92 + db * 9;
int delta_cr = dr * 128 - delta_l;
int delta_cb = db * 128 - delta_l;
int delta_l = dr * 14 + dg * 45 + db * 5;
int delta_cr = dr * 64 - delta_l;
int delta_cb = db * 64 - delta_l;
uint id = ((uint)(delta_l * delta_l) >> 7U) +
((((uint)(delta_cr * delta_cr) >> 7U) * 26U) >> 7U) +
((((uint)(delta_cb * delta_cb) >> 7U) * 3U) >> 7U);
uint id = ((uint)(delta_l * delta_l) >> 5U) +
((((uint)(delta_cr * delta_cr) >> 5U) * 26U) >> 7U) +
((((uint)(delta_cb * delta_cb) >> 5U) * 3U) >> 7U);
if (alpha)
{
@@ -114,7 +92,6 @@ uint color_distance(bool perceptual, color_rgba e1, color_rgba e2, bool alpha)
}
return id;
#endif
}
else if (alpha)
{

5219
encoder/basisu_ocl_kernels.h
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