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#version 440
layout(location = 0) in vec2 qt_TexCoord0;
layout(location = 0) out vec4 fragColor;
layout(std140, binding = 0) uniform buf {
// qt_Matrix and qt_Opacity must always be both present
// if the built-in vertex shader is used.
mat4 qt_Matrix;
float qt_Opacity;
vec3 minimumInputRGB;
vec3 maximumInputRGB;
float minimumInputAlpha;
float maximumInputAlpha;
vec3 minimumOutputRGB;
vec3 maximumOutputRGB;
float minimumOutputAlpha;
float maximumOutputAlpha;
vec3 gamma;
};
layout(binding = 1) uniform sampler2D source;
float linearstep(float e0, float e1, float x)
{
return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
}
void main()
{
vec4 textureColor = texture(source, qt_TexCoord0.st);
vec4 color = vec4(textureColor.rgb / max(1.0/256.0, textureColor.a), textureColor.a);
color.r = linearstep(minimumInputRGB.r, maximumInputRGB.r, color.r);
color.g = linearstep(minimumInputRGB.g, maximumInputRGB.g, color.g);
color.b = linearstep(minimumInputRGB.b, maximumInputRGB.b, color.b);
color.a = linearstep(minimumInputAlpha, maximumInputAlpha, color.a);
color.rgb = pow(color.rgb, gamma);
color.r = minimumOutputRGB.r + color.r * (maximumOutputRGB.r - minimumOutputRGB.r);
color.g = minimumOutputRGB.g + color.g * (maximumOutputRGB.g - minimumOutputRGB.g);
color.b = minimumOutputRGB.b + color.b * (maximumOutputRGB.b - minimumOutputRGB.b);
color.a = minimumOutputAlpha + color.a * (maximumOutputAlpha - minimumOutputAlpha);
fragColor = vec4(color.rgb * color.a, color.a) * qt_Opacity;
}
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