27 lines
1023 B
GLSL
Executable File
27 lines
1023 B
GLSL
Executable File
#pragma header
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// Value from (0, 1)
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uniform float amount;
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// Converts the input image to sepia, with `amount` representing the proportion of the conversion.
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// See https://drafts.fxtf.org/filter-effects/#sepiaEquivalent
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vec4 to_sepia(vec4 input_rgba) {
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float red = (0.393 + 0.607 * (1.0 - amount)) * input_rgba.r + (0.769 - 0.769 * (1.0 - amount)) * input_rgba.g + (0.189 - 0.189 * (1.0 - amount)) * input_rgba.b;
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float green = (0.349 - 0.349 * (1.0 - amount)) * input_rgba.r + (0.686 + 0.314 * (1.0 - amount)) * input_rgba.g + (0.168 - 0.168 * (1.0 - amount)) * input_rgba.b;
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float blue = (0.272 - 0.272 * (1.0 - amount)) * input_rgba.r + (0.534 - 0.534 * (1.0 - amount)) * input_rgba.g + (0.131 + 0.869 * (1.0 - amount)) * input_rgba.b;
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return vec4(red, green, blue, input_rgba.a);
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}
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void main() {
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// Get the texture to apply to.
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vec4 color = flixel_texture2D(bitmap, openfl_TextureCoordv);
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// Apply the darken effect.
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color = to_sepia(color);
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// Return the value.
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gl_FragColor = color;
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}
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