stk-code_catmod/data/shaders/multiply.frag

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uniform sampler2D tex1;
uniform sampler2D tex2;
out vec4 FragColor;
void main()
{
vec4 col1 = texture(tex1, gl_TexCoord[0].xy);
vec4 col2 = vec4(vec3(texture(tex2, gl_TexCoord[0].xy).x), 1.0);
FragColor = col1 * col2;
}