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uniform sampler2D texture_data;
uniform float transparency;
void main()
{
float opacity = 1.0 - clamp(transparency, 0.0, 1.0);
vec2 tcfull = vec2(vertex_texcoord.x, 1.0 - vertex_texcoord.y);
vec4 texel = texture(texture_data, tcfull);
texel.a *= opacity;
frag_color = texel;
}
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