79 lines
2.2 KiB
GLSL
79 lines
2.2 KiB
GLSL
uniform sampler2D ntex;
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uniform sampler2D dtex;
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uniform sampler2DArray shadowtex;
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uniform float split0;
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uniform float split1;
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uniform float split2;
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uniform float splitmax;
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uniform vec3 direction;
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uniform vec3 col;
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uniform float sunangle = .54;
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in vec2 uv;
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out vec4 Diff;
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out vec4 Spec;
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vec3 DecodeNormal(vec2 n);
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vec3 SpecularBRDF(vec3 normal, vec3 eyedir, vec3 lightdir, vec3 color, float roughness);
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vec4 getPosFromUVDepth(vec3 uvDepth, mat4 InverseProjectionMatrix);
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vec3 getMostRepresentativePoint(vec3 direction, vec3 R, float angularRadius)
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{
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vec3 D = direction;
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float d = cos(angularRadius);
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float r = sin(angularRadius);
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float DdotR = dot(D, R);
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vec3 S = R - DdotR * D;
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return (DdotR < d) ? normalize(d * D + normalize (S) * r) : R;
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}
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float getShadowFactor(vec3 pos, int index)
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{
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vec4 shadowcoord = (ShadowViewProjMatrixes[index] * InverseViewMatrix * vec4(pos, 1.0));
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shadowcoord.xy /= shadowcoord.w;
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vec2 shadowtexcoord = shadowcoord.xy * 0.5 + 0.5;
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float z = texture(shadowtex, vec3(shadowtexcoord, float(index))).x;
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float d = shadowcoord.z;
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return min(pow(exp(-32. * d) * z, 8.), 1.);
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}
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void main() {
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vec2 uv = gl_FragCoord.xy / screen;
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float z = texture(dtex, uv).x;
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vec4 xpos = getPosFromUVDepth(vec3(uv, z), InverseProjectionMatrix);
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vec3 norm = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
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float roughness =texture(ntex, uv).z;
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vec3 eyedir = -normalize(xpos.xyz);
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// Normalized on the cpu
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vec3 L = direction;
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float NdotL = clamp(dot(norm, L), 0., 1.);
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float angle = 3.14 * sunangle / 180.;
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vec3 R = reflect(-eyedir, norm);
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vec3 Lightdir = getMostRepresentativePoint(direction, R, angle);
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vec3 Specular = SpecularBRDF(norm, eyedir, Lightdir, col, roughness) * NdotL;
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vec3 outcol = NdotL * col;
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// Shadows
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int shadowtex_index = 0;
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shadowtex_index += (xpos.z >= split0) ? 1 : 0;
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shadowtex_index += (xpos.z >= split1) ? 1 : 0;
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shadowtex_index += (xpos.z >= split2) ? 1 : 0;
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float factor = getShadowFactor(xpos.xyz, shadowtex_index);
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factor = (xpos.z > splitmax) ? 1. : factor;
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Diff = vec4(factor * NdotL * col, 1.);
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Spec = vec4(factor * Specular, 1.);
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}
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