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in vec4 fragTexCoord;
out vec4 fragOut0;
out vec4 fragOut1;
out vec4 fragOut2;
out vec4 fragOut3;
out vec4 fragOut4;
out vec4 fragOut5;
uniform sampler2DMS texColor;
uniform sampler2DMS texPos;
uniform sampler2DMS texNormal;
uniform sampler2DMS texSpecular;
uniform sampler2DMS texEmissive;
uniform sampler2DMS texDepth;
layout (std140) uniform genericData {
int samples;
float fov;
};
const float voxelDepth = 2.5f;
const float voxelDepthFalloff = 2.5f;
#define SORT(a, b) if (a > b) { float t = dists[a]; dists[a] = dists[b]; dists[b] = t; }
//The following sorting networks for median calculation are NOT complete. Calculations that don't affect the
//median entry are removed, and thus, while the median element is correct, the rest of the array is NOT fully sorted
#ifdef SAMPLES_4
float getMedianDist(ivec2 texel) {
float dists[4];
for(int i = 0; i < 4; i++) {
dists[i] = texelFetch(texPos, texel, i).z;
}
SORT(0, 2)
SORT(1, 3)
SORT(0, 1)
SORT(2, 3)
SORT(1, 2)
return dists[1];
}
#else
#ifdef SAMPLES_8
float getMedianDist(ivec2 texel) {
float dists[8];
for(int i = 0; i < 8; i++) {
dists[i] = texelFetch(texPos, texel, i).z;
}
SORT(0, 4)
SORT(1, 5)
SORT(2, 6)
SORT(3, 7)
SORT(0, 2)
SORT(1, 3)
SORT(4, 6)
SORT(5, 7)
SORT(2, 4)
SORT(3, 5)
SORT(0, 1)
SORT(2, 3)
SORT(4, 5)
SORT(6, 7)
SORT(1, 4)
SORT(3, 6)
SORT(3, 4)
return dists[3];
}
#else
#ifdef SAMPLES_16
float getMedianDist(ivec2 texel) {
float dists[16];
for(int i = 0; i < 16; i++) {
dists[i] = texelFetch(texPos, texel, i).z;
}
SORT(0, 1)
SORT(2, 3)
SORT(4, 5)
SORT(6, 7)
SORT(8, 9)
SORT(10, 11)
SORT(12, 13)
SORT(14, 15)
SORT(0, 2)
SORT(4, 6)
SORT(8, 10)
SORT(12, 14)
SORT(1, 3)
SORT(5, 7)
SORT(9, 11)
SORT(13, 15)
SORT(0, 4)
SORT(1, 5)
SORT(2, 6)
SORT(3, 7)
SORT(8, 12)
SORT(9, 13)
SORT(10, 14)
SORT(11, 15)
SORT(0, 8)
SORT(1, 9)
SORT(2, 10)
SORT(3, 11)
SORT(4, 12)
SORT(5, 13)
SORT(6, 14)
SORT(7, 15)
SORT(5, 10)
SORT(6, 9)
SORT(3, 12)
SORT(13, 14)
SORT(7, 11)
SORT(1, 2)
SORT(4, 8)
SORT(7, 13)
SORT(2, 8)
SORT(5, 6)
SORT(9, 10)
SORT(3, 8)
SORT(6, 8)
SORT(3, 5)
SORT(7, 9)
SORT(5, 6)
SORT(7, 8)
SORT(6, 7)
return dists[7];
}
#else
//Fallback, do front first
float getMedianDist(ivec2 texel) {
float minDist = -1000000;
for(int i = 0; i < samples; i++) {
minDist = max(minDist, texelFetch(texPos, texel, i).z);
}
return minDist;
}
#endif //SAMPLES_16
#endif //SAMPLES_8
#endif //SAMPLES_4
void main()
{
vec2 texSize = textureSize(texColor);
ivec2 texel = ivec2(texSize * fragTexCoord.xy);
float texelWidthFactor = tan(fov / texSize.y);
float dist = getMedianDist(texel);
float weight = 0.0f;
vec4 color = vec4(0);
vec4 pos = vec4(0);
vec4 normal = vec4(0);
vec4 specular = vec4(0);
vec4 emissive = vec4(0);
float depth = 0;
for(int i = 0; i < samples; i++) {
vec4 localPos = texelFetch(texPos, texel, i);
//Calculate local weight from distance Voxel, but if the distance is 0 (i.e. no model at all), set weight to 1 to allow stuff like background emissive
float localWeight = max(step(-0.001, dist),
smoothstep(dist + dist * texelWidthFactor * (voxelDepth + voxelDepthFalloff), dist + dist * texelWidthFactor * voxelDepth, localPos.z) *
smoothstep(dist - dist * texelWidthFactor * voxelDepth, dist + dist * texelWidthFactor * (voxelDepth + voxelDepthFalloff), localPos.z)
);
pos += localPos * localWeight;
color += texelFetch(texColor, texel, i) * localWeight;
normal += texelFetch(texNormal, texel, i) * localWeight;
specular += texelFetch(texSpecular, texel, i) * localWeight;
emissive += texelFetch(texEmissive, texel, i) * localWeight;
depth += texelFetch(texDepth, texel, i).x * localWeight;
weight += localWeight;
}
fragOut0 = color / weight;
fragOut1 = pos / weight;
fragOut2 = normalize(normal);
fragOut3 = specular / weight;
fragOut4 = emissive / weight;
gl_FragDepth = depth / weight;
}
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