stk-code_catmod/data/shaders/sunlight.frag

63 lines
1.2 KiB
GLSL

#version 130
uniform sampler2D ntex;
uniform sampler2D dtex;
//uniform sampler2D cloudtex;
uniform vec3 direction;
uniform vec3 col;
uniform mat4 invproj;
//uniform int hasclouds;
//uniform vec2 wind;
in vec2 uv;
out vec4 Diff;
out vec4 Spec;
out vec4 SpecularMap;
vec3 DecodeNormal(vec2 n)
{
float z = dot(n, n) * 2. - 1.;
vec2 xy = normalize(n) * sqrt(1. - z * z);
return vec3(xy,z);
}
void main() {
float z = texture(dtex, uv).x;
vec4 xpos = 2.0 * vec4(uv, z, 1.0) - 1.0;
xpos = invproj * xpos;
xpos.xyz /= xpos.w;
if (z < 0.03)
{
// Skyboxes are fully lit
Diff = vec4(1.0);
Spec = vec4(1.0);
return;
}
vec3 norm = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
// Normalized on the cpu
vec3 L = direction;
float NdotL = max(0.0, dot(norm, L));
vec3 R = reflect(L, norm);
float RdotE = max(0.0, dot(R, normalize(xpos.xyz)));
float Specular = pow(RdotE, 200);
vec3 outcol = NdotL * col;
/* if (hasclouds == 1)
{
vec2 cloudcoord = (xpos.xz * 0.00833333) + wind;
float cloud = texture(cloudtex, cloudcoord).x;
//float cloud = step(0.5, cloudcoord.x) * step(0.5, cloudcoord.y);
outcol *= cloud;
}*/
Diff = vec4(NdotL * col, 1.);
Spec = vec4(Specular * col, 1.);
SpecularMap = vec4(1.0);
}