// INPUT DATA

#ifdef TEXTURABLE
in vec2 texCoord;
#endif

#ifdef DIFFUSE_TEXTURE
uniform sampler2D diffuseTexture;
#else
uniform vec3 materialKd;
#endif

#ifdef ALPHA_MASK
uniform sampler2D alphaMask;
#else
uniform float opacity;
#endif

// OUTPUT COLOR

layout(location = 0)out vec4 outColor;

// MAIN PROGRAM

void main(void)
{
    #ifdef DIFFUSE_TEXTURE
    vec3 color = texture(diffuseTexture, texCoord).rgb;
    #else
    vec3 color = materialKd;
    #endif

    #ifdef ALPHA_MASK
    float alpha = texture(alphaMask, texCoord).r;
    #else
    float alpha = opacity;
    #endif

    outColor = vec4(color, alpha);
}