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Fix YUV->RGB shader (YCbCr->RGB really).

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WebRTC SDK got it wrong.

See https://web.archive.org/web/20180421030430/
http://www.equasys.de/colorconversion.html
This commit is contained in:
John Preston 2021-06-04 14:46:05 +04:00
parent 45c476da3a
commit 06f7b1d4ec
1 changed files with 8 additions and 2 deletions
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10
ui/gl/gl_shader.cpp
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@ -74,10 +74,16 @@ uniform sampler2D u_texture;
uniform sampler2D v_texture; uniform sampler2D v_texture;
)", )",
.body = R"( .body = R"(
float y = texture2D(y_texture, v_texcoord).r; // float y = texture2D(y_texture, v_texcoord).r;
float y = texture2D(y_texture, v_texcoord).r - 0.0625;
float u = texture2D(u_texture, v_texcoord).r - 0.5; float u = texture2D(u_texture, v_texcoord).r - 0.5;
float v = texture2D(v_texture, v_texcoord).r - 0.5; float v = texture2D(v_texture, v_texcoord).r - 0.5;
result = vec4(y + 1.403 * v, y - 0.344 * u - 0.714 * v, y + 1.77 * u, 1); // result = vec4(y + 1.403 * v, y - 0.344 * u - 0.714 * v, y + 1.77 * u, 1);
result = vec4(
1.164 * y + 1.596 * v,
1.164 * y - 0.392 * u - 0.813 * v,
1.164 * y + 2.17 * u,
1.);
)", )",
}; };
} }