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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;
float desaturation;
};
layout(binding = 1) uniform sampler2D source;
void main(void)
{
vec4 textureColor = texture(source, qt_TexCoord0.st);
float grayColor = (textureColor.r + textureColor.g + textureColor.b) / 3.0;
fragColor = mix(textureColor, vec4(vec3(grayColor), textureColor.a), desaturation) * qt_Opacity;
}
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