shadow.frag

#version 440
layout(location = 0) in vec2 qt_TexCoord0;
layout(location = 0) out vec4 fragColor;
layout(std140, binding = 0) uniform buf {
    mat4 qt_Matrix;
    float qt_Opacity;
    int transparent;

};
layout(binding = 1) uniform sampler2D source;
layout(binding = 2) uniform sampler2D shadow;
layout(binding = 3) uniform sampler2D mask;

void main() {
    fragColor = vec4(
        ((1 - transparent)* texture(source, qt_TexCoord0) * (1- texture(shadow, qt_TexCoord0))
        + transparent * texture(source, qt_TexCoord0)).rgb,
                     texture(source, qt_TexCoord0).a)
    * texture(mask, qt_TexCoord0).a
    * (1 - texture(shadow, qt_TexCoord0).a * transparent)
    * qt_Opacity ;
}