76 lines
2.3 KiB
GLSL
76 lines
2.3 KiB
GLSL
#ifdef GL_ES
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precision highp float;
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#endif
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uniform sampler2D texture;
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uniform mat3 color_matrix;
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uniform float inv_gamma;
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#ifdef BITS_10
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uniform float row_length;
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uniform float padding_ratio;
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#endif
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varying vec2 top_left_uv;
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varying vec2 top_right_uv;
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varying vec2 bottom_left_uv;
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varying vec2 bottom_right_uv;
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#ifdef BITS_10
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vec2
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skip_5th_pixel(vec2 uv)
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{
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vec2 new_uv = uv;
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new_uv.x *= 0.8;
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new_uv.x += floor(uv.x * row_length / 5.0) / row_length;
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// Crop out padding
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new_uv.x *= padding_ratio;
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return new_uv;
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}
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#endif
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void
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main()
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{
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// Note the coordinates for texture samples need to be a varying, as the
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// Mali-400 has this as a fast path allowing 32-bit floats. Otherwise
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// they end up as 16-bit floats and that's not accurate enough.
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#ifdef BITS_10
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vec4 samples = vec4(texture2D(texture, skip_5th_pixel(top_left_uv)).r,
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texture2D(texture, skip_5th_pixel(top_right_uv)).r,
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texture2D(texture, skip_5th_pixel(bottom_left_uv)).r,
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texture2D(texture, skip_5th_pixel(bottom_right_uv)).r);
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#else
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vec4 samples = vec4(texture2D(texture, top_left_uv).r,
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texture2D(texture, top_right_uv).r,
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texture2D(texture, bottom_left_uv).r,
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texture2D(texture, bottom_right_uv).r);
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#endif
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#if defined(CFA_BGGR)
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vec3 color = vec3(samples.w, (samples.y + samples.z) / 2.0, samples.x);
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#elif defined(CFA_GBRG)
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vec3 color = vec3(samples.z, (samples.x + samples.w) / 2.0, samples.y);
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#elif defined(CFA_GRBG)
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vec3 color = vec3(samples.y, (samples.x + samples.w) / 2.0, samples.z);
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#else
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vec3 color = vec3(samples.x, (samples.y + samples.z) / 2.0, samples.w);
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#endif
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// Some crude blacklevel correction to make the preview a bit nicer, this
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// should be an uniform
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vec3 corrected = color - 0.02;
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/*
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// Fast SRGB estimate. See https://mimosa-pudica.net/fast-gamma/
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vec3 gamma_color =
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(vec3(1.138) * inversesqrt(corrected) - vec3(0.138)) * corrected;
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*/
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color = color * color_matrix;
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vec3 gamma_color = pow(color, vec3(inv_gamma));
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gl_FragColor = vec4(gamma_color, 1);
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}
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