in vec2 texCoord_interp;
out vec4 fragColor;

uniform vec4 color;
uniform sampler2D image;

void main()
{
  fragColor = texture(image, texCoord_interp).r * color.rgba;
  /* Premul by alpha (not texture alpha)
   * Use blending function GPU_blend_set_func(GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA); */
  fragColor.rgb *= color.a;
}