55 lines
1.3 KiB
GLSL
55 lines
1.3 KiB
GLSL
uniform sampler2D ntex;
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uniform sampler2D dtex;
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uniform float spec;
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uniform mat4 invproj;
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uniform mat4 ViewMatrix;
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uniform vec2 screen;
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flat in vec3 center;
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flat in float energy;
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flat in vec3 col;
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out vec4 Diffuse;
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out vec4 Specular;
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vec3 DecodeNormal(vec2 n)
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{
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float z = dot(n, n) * 2. - 1.;
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vec2 xy = normalize(n) * sqrt(1. - z * z);
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return vec3(xy,z);
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}
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void main() {
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vec2 texc = gl_FragCoord.xy / screen;
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float z = texture(dtex, texc).x;
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vec3 norm = normalize(DecodeNormal(2. * texture(ntex, texc).xy - 1.));
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vec4 xpos = 2.0 * vec4(texc, z, 1.0) - 1.0f;
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xpos = invproj * xpos;
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xpos /= xpos.w;
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vec3 eyedir = normalize(xpos.xyz);
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vec3 diffuse = vec3(0.), specular = vec3(0.);
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vec4 pseudocenter = ViewMatrix * vec4(center.xyz, 1.0);
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pseudocenter /= pseudocenter.w;
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vec3 light_pos = pseudocenter.xyz;
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vec3 light_col = col.xyz;
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float d = distance(light_pos, xpos.xyz);
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float att = energy * 200. / (4. * 3.14 * d * d);
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float spec_att = (energy + 10.) * 200. / (4. * 3.14 * d * d);
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// Light Direction
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vec3 L = normalize(xpos.xyz - light_pos);
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float NdotL = max(0.0, dot(norm, -L));
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diffuse += NdotL * light_col * att;
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// Reflected light dir
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vec3 R = reflect(-L, norm);
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float RdotE = max(0.0, dot(R, eyedir));
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specular += pow(RdotE, spec) * light_col * spec_att;
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Diffuse = vec4(diffuse, 1.);
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Specular = vec4(specular , 1.);
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}
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