stk-code_catmod/data/shaders/object_pass1.frag

uniform sampler2D tex;

#if __VERSION__ >= 130
in vec3 nor;
in vec2 uv;
out vec3 EncodedNormal;
#else
varying vec3 nor;
#define EncodedNormal gl_FragColor.xy
#endif

vec2 EncodeNormal(vec3 n);

void main(void)
{
	vec4 col = texture(tex, uv);
	EncodedNormal.xy = 0.5 * EncodeNormal(normalize(nor)) + 0.5;
	EncodedNormal.z = exp2(10. * (1. - col.a) + 1.);
}