29 lines
667 B
GLSL
29 lines
667 B
GLSL
#ifndef INC_YUYV
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#define INC_YUYV
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const int YUYV_FOURCC = 1448695129;
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// https://en.wikipedia.org/wiki/Y%E2%80%B2UV
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const mat3x3 yuyv_to_rgb_bt709 = mat3x3(1., 1., 1., 0., -.21482, 2.12798, 1.28033, -.38059, 0.);
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vec4 yuyvTex(sampler2D tex, vec2 vUV, int base_width) {
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float w = base_width - 1.;
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int x = int(vUV.x * w);
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int xU = x - x % 2;
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int xV = x - x % 2 + 1;
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vec4 tU = texture(tex, vec2(xU / w, 1. - vUV.y));
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vec4 tV = texture(tex, vec2(xV / w, 1. - vUV.y));
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vec3 yuv = vec3(
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x % 2 == 0. ? tU.x : tV.x,
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tU.y - .5,
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tV.y - .5
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);
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return vec4(yuyv_to_rgb_bt709 * yuv, 1.);
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}
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#endif
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