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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;
vec4 color;
float relativeSizeX;
float relativeSizeY;
float spread;
};
float linearstep(float e0, float e1, float x)
{
return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
}
void main()
{
float alpha =
smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - qt_TexCoord0.x)) *
smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - qt_TexCoord0.y));
float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha);
fragColor = color * qt_Opacity * spreadMultiplier * spreadMultiplier;
}