cube-game-plus-plus/resources/shader/overlayFragment.fs

#version 430

layout (binding = 0) uniform sampler2D samp;

uniform bool useTexture;
uniform bool useColor;

in vec4 varColor;
in vec2 varTextureCoord;

out vec4 color;

void main() {
    if(useTexture) {
        color = texture(samp, varTextureCoord);
        if(useColor) {
            color = vec4(varColor.xyz, color.w);
        }
    } else {
        color = varColor;
    }
}