source/blender/gpu/shaders/gpu_shader_image_shuffle_color_frag.glsl


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#if __VERSION__ == 120
  varying vec2 texCoord_interp;
  #define fragColor gl_FragColor
#else
  in vec2 texCoord_interp;
  out vec4 fragColor;
  #define texture2D texture
#endif

uniform sampler2D image;
uniform vec4 color;
uniform vec4 shuffle;

void main()
{
	vec4 sample = texture2D(image, texCoord_interp);
	fragColor = vec4(sample.r * shuffle.r +
	                 sample.g * shuffle.g +
	                 sample.b * shuffle.b +
	                 sample.a * shuffle.a) * color;
}