64 lines
2.2 KiB
GLSL
64 lines
2.2 KiB
GLSL
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#version 120
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uniform sampler2D normal_tex;
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uniform sampler2D depth_tex;
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uniform sampler2D spec_emis_tex;
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uniform sampler3D noise_tex;
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uniform vec2 fg_BufferSize;
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uniform vec3 fg_Planes;
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uniform vec4 fg_du;
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uniform vec4 fg_dv;
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uniform float g_scale;
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uniform float g_bias;
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uniform float g_intensity;
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uniform float g_sample_rad;
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uniform float random_size;
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uniform int osg_FrameNumber;
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varying vec4 ray;
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const vec2 v[4] = vec2[](vec2(1.0,0.0),vec2(-1.0,0.0),vec2(0.0,1.0),vec2(0.0,-1.0));
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vec3 position( vec3 viewDir, vec2 coords, sampler2D depth_tex );
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vec3 normal_decode(vec2 enc);
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vec2 getRandom( in vec2 uv ) {
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int level = osg_FrameNumber - ((osg_FrameNumber / 64) * 64);
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return normalize( texture3D( noise_tex, vec3(uv*50.0, float(level) / 64.0) ).xy * 0.14 - 0.07 );
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}
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vec3 getPosition(in vec2 uv, in vec2 uv0, in vec4 ray0) {
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vec2 duv = uv - uv0;
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vec4 ray = ray0 + fg_du * duv.x + fg_dv * duv.y;
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vec3 viewDir = normalize( ray.xyz );
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return position(viewDir, uv, depth_tex);
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}
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float doAmbientOcclusion(in vec2 tcoord, in vec2 uv, in vec3 p, in vec3 cnorm, in vec4 ray) {
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vec3 diff = getPosition(tcoord+uv,tcoord,ray)-p;
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float d = length(diff);
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vec3 v = diff / d;
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d *= g_scale;
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return max(0.0, dot( cnorm,v ) - g_bias) * (1.0/(1.0+d)) * g_intensity;
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}
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void main() {
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vec2 coords = gl_TexCoord[0].xy;
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float initialized = texture2D( spec_emis_tex, coords ).a;
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if ( initialized < 0.1 )
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discard;
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vec3 normal = normal_decode(texture2D( normal_tex, coords ).rg);
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vec3 viewDir = normalize(ray.xyz);
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vec3 pos = position(viewDir, coords, depth_tex);
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vec2 rand = getRandom(coords);
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float ao = 0.0;
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float rad = g_sample_rad;
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int iterations = 4;
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for (int j = 0; j < 1; ++j ) {
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vec2 coord1 = reflect( v[j], rand ) * rad;
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vec2 coord2 = vec2( coord1.x*0.707 - coord1.y*0.707, coord1.x*0.707 + coord1.y*0.707 );
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ao += doAmbientOcclusion(coords,coord1*0.25,pos,normal,ray);
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ao += doAmbientOcclusion(coords,coord2*0.5,pos,normal,ray);
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ao += doAmbientOcclusion(coords,coord1*0.75,pos,normal,ray);
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ao += doAmbientOcclusion(coords,coord2,pos,normal,ray);
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}
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ao /= 16.0;
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gl_FragColor = vec4( vec3(1.0 - ao), 1.0 );
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}
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