" vec4 canvas = texture2D(tex2, gl_FragCoord.xy / tex2_dimensions);\n"
" vec4 result = canvas * (1.0 - gl_FragColor.a);\n"
" gl_FragColor = mix(canvas, result, alpha);\n"
" vec4 canvas = texture2D(tex2, gl_FragCoord.xy / tex2_dimensions);\n"
" vec4 result = canvas * (1.0 - gl_FragColor.a);\n"
" gl_FragColor = mix(canvas, result, alpha);\n"