ilikecats/stk-code_catmod
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SSAO: Use int rounding

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vlj 2014-05-12 18:39:33 +02:00
parent 229b72f84a
commit 23ba597a1c
1 changed files with 84 additions and 80 deletions
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20
data/shaders/ssao.frag
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@ -5,6 +5,7 @@ uniform sampler2D ntex;
uniform sampler2D dtex;
uniform sampler2D noise_texture;
uniform vec4 samplePoints[16];
uniform vec2 screen = vec2(1680, 1050);
#ifdef UBO_DISABLED
uniform mat4 ViewMatrix;
@ -26,11 +27,11 @@ in vec2 uv;
out float AO;
const float sigma = 1.;
const float tau = 7.;
const float tau = 2.;
const float beta = 0.0001;
const float epsilon = .00001;
const float radius = 2.;
const float k = 1.5;
const float radius = 1.;
const float k = 1.;
#define SAMPLES 16
@ -53,7 +54,7 @@ void main(void)
float len = dot(vec3(1.0), abs(cur.xyz));
if (len < 0.2) discard;
int x = int(1024. * uv.x), y = int(1024. * uv.y);
int x = int(gl_FragCoord.x), y = int(gl_FragCoord.y);
float r = radius / FragPos.z;
float phi = 30. * (x ^ y) + 10. * x * y;
float bl = 0.0;
@ -62,13 +63,16 @@ void main(void)
float alpha = (i + .5) * invSamples;
float theta = 2. * 3.14 * tau * alpha + phi;
float h = r * alpha;
vec2 occluder_uv = h * vec2(cos(theta), sin(theta));
occluder_uv += uv;
vec2 occluder_uv = h * vec2(cos(theta), sin(theta)) * screen;
occluder_uv += gl_FragCoord.xy;
float m = round(log2(h)) + 7;
ivec2 ioccluder_uv = ivec2(occluder_uv);
occluder_uv = (ioccluder_uv >> int(m)) << int(m);
occluder_uv /= screen;
if (occluder_uv.x < 0. || occluder_uv.x > 1. || occluder_uv.y < 0. || occluder_uv.y > 1.) continue;
float m = round(log2(h)) + 7.;
float occluderFragmentDepth = textureLod(dtex, occluder_uv, m).x;
vec4 OccluderPos = getPosFromUVDepth(vec3(occluder_uv, occluderFragmentDepth), InverseProjectionMatrix);