Load various built-in things through Resources

[libs/gl.git] / builtin_data / _ambientocclusion_occlude.glsl

diff --git a/builtin_data/_ambientocclusion_occlude.glsl b/builtin_data/_ambientocclusion_occlude.glsl
new file mode 100644 (file)
index 0000000..e190032
--- /dev/null
+++ b/builtin_data/_ambientocclusion_occlude.glsl
@@ -0,0 +1,25 @@
+import postprocess;
+import _ambientocclusion;
+
+#pragma MSP stage(fragment)
+void main()
+{
+       vec4 rv = texture(rotate, gl_FragCoord.xy/4.0)*2.0-1.0;
+       mat3 transform = mat3(rv.xy, 0.0, rv.zx, 0.0, 0.0, 0.0, rv.w)*occlusion_radius;
+       vec3 center = unproject(vec3(vertex.xy, texture(depth, texcoord).r));
+       float min_depth = project(vec3(center.xy, center.z+occlusion_radius)).z;
+       float occlusion_sum = 0.0;
+       float count = 0.0;
+       for(int i=0; i<n_samples; ++i)
+       {
+               vec3 psp = project(center+transform*sample_points[i]);
+               float sample = texture(depth, psp.xy*0.5+0.5).r;
+               if(sample>=min_depth)
+               {
+                       if(sample<psp.z)
+                               occlusion_sum += 1.0;
+                       count += 1.0;
+               }
+       }
+       frag_color = vec4(1.0-occlusion_sum/count, 0.0, 0.0, 1.0);
+}