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Use dFdX/dFdY to compute normals in SSAO.

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This commit is contained in:
Vincent Lejeune 2014-05-11 18:09:48 +02:00
parent e5410e23a2
commit 567974aeed
1 changed files with 4 additions and 2 deletions
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6
data/shaders/ssao.frag
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@ -1,4 +1,5 @@
// From paper http://graphics.cs.williams.edu/papers/AlchemyHPG11/
// and improvements here http://graphics.cs.williams.edu/papers/SAOHPG12/
uniform sampler2D ntex;
uniform sampler2D dtex;
@ -49,10 +50,11 @@ void main(void)
vec4 cur = texture(ntex, uv);
float curdepth = texture(dtex, uv).x;
vec4 FragPos = getPosFromUVDepth(vec3(uv, curdepth), InverseProjectionMatrix);
if (FragPos.z < 0.) discard;
// get the normal of current fragment
vec3 norm = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
vec3 ddx = dFdx(FragPos.xyz);
vec3 ddy = dFdy(FragPos.xyz);
vec3 norm = normalize(cross(ddy, ddx));
// Workaround for nvidia and skyboxes
float len = dot(vec3(1.0), abs(cur.xyz));
if (len < 0.2 || curdepth > 0.9955) discard;