stk-code_catmod/data/shaders/shadowref.frag

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#ifdef GL_ARB_bindless_texture
layout(bindless_sampler) uniform sampler2D tex;
#else
uniform sampler2D tex;
#endif
in vec2 uv;
in vec4 color;
out vec4 FragColor;
void main(void)
{
vec4 col = texture(tex, uv);
if (col.a < 0.5) discard;
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FragColor = vec4(exp(8. * (2. * gl_FragCoord.z - 1.) / gl_FragCoord.w));
}