1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
varying vec2 source_texcoords; uniform sampler1D source_sampler; vec4 get_source() { return texture1D (source_sampler, source_texcoords.x); } varying float mask_coverage; vec4 get_mask() { return vec4(0, 0, 0, mask_coverage); } void main() { gl_FragColor = get_source() * get_mask().a; }