Make ambient occlusion edge detection threshold adjustable

[libs/gl.git] / shaderlib / ambientocclusion_combine.glsl

diff --git a/shaderlib/ambientocclusion_combine.glsl b/shaderlib/ambientocclusion_combine.glsl
index f56bddbc520809cc37ca6ae8d0ca7753751907d6..c1e7f27270a1388703ac8cc744901278180f2ac3 100644 (file)
--- a/shaderlib/ambientocclusion_combine.glsl
+++ b/shaderlib/ambientocclusion_combine.glsl
@@ -1,21 +1,23 @@
 import postprocess;
 import ambientocclusion;
 
-////// fragment
+#pragma MSP stage(fragment)
 void main()
 {
        vec3 center = unproject(vec3(vertex.xy, texture(depth, texcoord).r));
-       float min_depth = project(vec3(center.xy, center.z+occlusion_radius*0.1)).z;
-       float max_depth = project(vec3(center.xy, center.z-occlusion_radius*0.1)).z;
        vec2 tex_scale = 1.0/vec2(textureSize(occlusion, 0));
        float sum = 0.0;
        float count = 0.0;
        for(int i=0; i<4; ++i)
                for(int j=0; j<4; ++j)
                {
-                       vec2 offset = vec2(float(i)-1.5, float(j)-1.5)*tex_scale;
-                       float occ = texture(occlusion, texcoord+offset).r;
-                       float sample = texture(depth, texcoord+offset).r;
+                       vec2 offset = vec2(float(i), float(j))-1.5;
+                       vec2 sample_coord = texcoord+offset*tex_scale;
+                       float occ = texture(occlusion, sample_coord).r;
+                       float sample = texture(depth, sample_coord).r;
+                       float z_range = occlusion_radius*length(offset)*edge_depth_threshold;
+                       float min_depth = project(vec3(center.xy, center.z+z_range)).z;
+                       float max_depth = project(vec3(center.xy, center.z-z_range)).z;
                        if(sample>=min_depth && sample<=max_depth)
                        {
                                sum += occ;