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gl-renderer: move alpha pre-mult from YUV to RGB

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Mathematically the result is the same, while multiplying RGB with alpha
is easier to understand as correct than the earlier form.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen
2021-02-08 16:54:12 +02:00
parent a8d5ef4a04
commit 054ba37084
1 changed files with 2 additions and 3 deletions
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libweston/renderer-gl/fragment.glsl
+2 -3
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@@ -57,12 +57,11 @@ yuva2rgba(float y, float u, float v, float a)
{ {
vec4 color_out; vec4 color_out;
y *= a;
u *= a;
v *= a;
color_out.r = y + 1.59602678 * v; color_out.r = y + 1.59602678 * v;
color_out.g = y - 0.39176229 * u - 0.81296764 * v; color_out.g = y - 0.39176229 * u - 0.81296764 * v;
color_out.b = y + 2.01723214 * u; color_out.b = y + 2.01723214 * u;
color_out.rgb *= a;
color_out.a = a; color_out.a = a;
return color_out; return color_out;