X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=shaderlib%2Fambientocclusion_occlude.glsl;h=2a10bde34613cb9cd933c2caa437c6cc781ff162;hp=f9b755c9c7b71d0667dae0c940cd275b87c69ad0;hb=73bef37da97b6da0b99227f63235cb52c4e56c44;hpb=e55f79ccb21e8c1be3d86f127e3ec1583e58ce92

diff --git a/shaderlib/ambientocclusion_occlude.glsl b/shaderlib/ambientocclusion_occlude.glsl
index f9b755c9..2a10bde3 100644
--- a/shaderlib/ambientocclusion_occlude.glsl
+++ b/shaderlib/ambientocclusion_occlude.glsl
@@ -1,23 +1,25 @@
 import postprocess;
 import ambientocclusion;
 
-////// fragment
+#pragma MSP stage(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)
+	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)
 		{
-			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;
+			if(sample<psp.z)
+				occlusion_sum += 1.0;
+			count += 1.0;
 		}
-	frag_color = vec4(min(1.0-sum*darkness/16.0, 1.0), 0.0, 0.0, 1.0);
+	}
+	frag_color = vec4(1.0-occlusion_sum/count, 0.0, 0.0, 1.0);
 }