common.glsl

gistfile1.txt

float when_fgt(float x, float y) {
 return max(sign(x - y), 0.0);
}


vec2 correctRatio(vec2 inUv, float baseratio, float asp){

	return mix(
		vec2(
			inUv.x,
			inUv.y * baseratio / asp + .5 * ( 1. - baseratio / asp )
		),
		vec2(
			inUv.x * asp / baseratio + .5 * ( 1. - asp / baseratio),
			inUv.y
		)
		,when_fgt(baseratio, asp)
	);
}


vec2 screenspacefrompos(vec4 sspPos){

	vec4 tempssp = sspPos;
	tempssp.xyz /= tempssp.w;
	tempssp.xy = (0.5)+(tempssp.xy)*0.5;
	return tempssp.xy;
}