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#version 440
layout(location = 0) out vec4 fragColor;
layout(std140, binding = 0) uniform buf {
vec4 tint;
} ubuf;
layout(push_constant, std140) uniform PC {
vec4 offsetScale;
vec4 color;
mat3 colorMat;
float weights[2];
} pc;
void main()
{
// colorMat is the identity and the weights add up to 1, so this is the
// color itself - but only if the block was read back correctly.
float w = pc.weights[0] + pc.weights[1];
vec3 c = pc.colorMat * pc.color.rgb;
fragColor = vec4(c * w, pc.color.a) * ubuf.tint;
}