X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fambientocclusion_occlude.glsl;fp=shaderlib%2Fambientocclusion_occlude.glsl;h=f9b755c9c7b71d0667dae0c940cd275b87c69ad0;hb=e55f79ccb21e8c1be3d86f127e3ec1583e58ce92;hp=0000000000000000000000000000000000000000;hpb=b2764a3a349b48d7445202faa903383386c09a4c;p=libs%2Fgl.git

diff --git a/shaderlib/ambientocclusion_occlude.glsl b/shaderlib/ambientocclusion_occlude.glsl
new file mode 100644
index 00000000..f9b755c9
--- /dev/null
+++ b/shaderlib/ambientocclusion_occlude.glsl
@@ -0,0 +1,23 @@
+import postprocess;
+import ambientocclusion;
+
+////// fragment
+void main()
+{
+	mat2 transform = mat2(texture(rotate, texcoord*screen_size/4.0)*2.0-1.0)
+ 		*mat2(screen_size.y/screen_size.x, 0.0, 0.0, 1.0)*3.0/screen_size.y;
+	float sample = depth_ratio.x/(texture(depth, texcoord).r-depth_ratio.y);
+	float sum = 0.0;
+	for(int i=0; i<=3; ++i)
+		for(int j=0; j<=3; ++j)
+		{
+			vec2 offs = transform*vec2(float(i)-1.5, float(j)-1.5);
+			float dxy = length(offs)*-sample;
+			float dz = depth_ratio.x/(texture(depth, texcoord+offs).r-depth_ratio.y)-sample;
+			if(abs(dz)<3.0*dxy)
+				sum += atan(dz/dxy)/1.570796;
+			else if(dz<0.0)
+				sum -= 0.8;
+		}
+	frag_color = vec4(min(1.0-sum*darkness/16.0, 1.0), 0.0, 0.0, 1.0);
+}