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uniform sampler2D texture_data;
uniform sampler2D background;
void main()
{
vec2 tcfull = vec2(vertex_texcoord.x, 1.0 - vertex_texcoord.y);
vec4 texel = texture(texture_data, tcfull);
if (texel.r == 0.0) {
discard;
}
frag_color = vec4(1.0, 1.0, 1.0, 1.0);
}
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