17103d765f
Support dmabuf textures in the GL renderer. This copies the approach taken by mutter for yuv dmabuf conversion.
50 lines
1001 B
GLSL
50 lines
1001 B
GLSL
// VERTEX_SHADER:
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// y_xuxv_to_rgba.glsl
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void main() {
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gl_Position = u_projection * u_modelview * vec4(aPosition, 0.0, 1.0);
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vUv = vec2(aUv.x, aUv.y);
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}
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// FRAGMENT_SHADER:
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// y_xuxv_to_rgba.glsl
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uniform sampler2D u_source2;
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vec4 yuv_to_rgb(vec4 yuv)
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{
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vec4 res;
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float Y = 1.16438356 * (yuv.x - 0.0625);
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float su = yuv.y - 0.5;
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float sv = yuv.z - 0.5;
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res.r = Y + 1.59602678 * sv;
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res.g = Y - 0.39176229 * su - 0.81296764 * sv;
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res.b = Y + 2.01723214 * su;
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res.rgb *= yuv.w;
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res.a = yuv.w;
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return res;
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}
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/* This shader converts single-plane yuv (DRM_FORMAT_YUYV) into rgb.
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* It assumes that the buffer has been imported twice - once as RG
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* texture with full size, and once as RGBA textures with half the
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* width (to account for the subsampling).
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*/
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void main() {
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vec4 y = GskTexture(u_source, vUv);
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vec4 uv = GskTexture(u_source2, vUv);
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vec4 yuv;
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yuv.x = y.x;
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yuv.yz = uv.yw;
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yuv.w = 1.0;
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gskSetOutputColor(yuv_to_rgb(yuv));
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}
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