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openmw-tes3mp/files/shaders/s360_fragment.glsl

53 lines
1.1 KiB
GLSL

#version 120
varying vec2 uv;
uniform samplerCube cubeMap;
uniform int mapping;
#define PI 3.1415926535
vec3 sphericalCoords(vec2 coords)
{
coords.x = -1 * coords.x * 2 * PI;
coords.y = (coords.y - 0.5) * PI;
vec3 result = vec3(0.0,cos(coords.y),sin(coords.y));
result = vec3(cos(coords.x) * result.y,sin(coords.x) * result.y,result.z);
return result;
}
vec3 cylindricalCoords(vec2 coords)
{
return normalize(vec3(cos(-1 * coords.x * 2 * PI),sin(-1 * coords.x * 2 * PI),coords.y * 2.0 - 1.0));
}
vec3 planetCoords(vec2 coords)
{
vec2 fromCenter = coords - vec2(0.5,0.5);
float magnitude = length(fromCenter);
fromCenter = normalize(fromCenter);
float dotProduct = dot(fromCenter,vec2(0.0,1.0));
coords.x = coords.x > 0.5 ? 0.5 - (dotProduct + 1.0) / 4.0 : 0.5 + (dotProduct + 1.0) / 4.0;
coords.y = max(0.0,1.0 - pow(magnitude / 0.5,0.5));
return sphericalCoords(coords);
}
void main(void)
{
vec3 c;
if (mapping == 0)
c = sphericalCoords(uv);
else if (mapping == 1)
c = cylindricalCoords(uv);
else
c = planetCoords(uv);
gl_FragData[0] = textureCube(cubeMap,c);
}