36 lines
1.1 KiB
GLSL
36 lines
1.1 KiB
GLSL
uniform sampler2D tex_in;
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uniform vec4 shadows_color_in;
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uniform vec4 midtones_color_in;
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uniform vec4 highlights_color_in;
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uniform float shadows_amount_in;
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uniform float midtones_amount_in;
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uniform float highlights_amount_in;
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uniform vec3 luma_coefficients_in;
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in vec2 ove_texcoord;
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out vec4 frag_color;
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vec3 color_offset(vec4 control, float amount)
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{
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return (control.rgb - vec3(0.5)) * 2.0 * amount;
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}
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void main(void)
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{
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vec4 source = texture(tex_in, ove_texcoord);
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float luma = clamp(dot(source.rgb, luma_coefficients_in), 0.0, 1.0);
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float shadow_weight = smoothstep(0.75, 0.0, luma);
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float highlight_weight = smoothstep(0.25, 1.0, luma);
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float midtone_weight = clamp(1.0 - abs(luma - 0.5) * 2.0, 0.0, 1.0);
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vec3 adjustment =
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color_offset(shadows_color_in, shadows_amount_in) * shadow_weight +
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color_offset(midtones_color_in, midtones_amount_in) * midtone_weight +
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color_offset(highlights_color_in, highlights_amount_in) * highlight_weight;
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vec3 graded = source.rgb + adjustment * source.rgb * (1.0 - source.rgb);
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frag_color = vec4(clamp(graded, 0.0, 1.0), source.a);
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}
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