1 files changed, 203 insertions, 0 deletions

diff --git a/linden/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl b/linden/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
new file mode 100644
index 0000000..8ced94e
--- /dev/null
+++ b/linden/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
@@ -0,0 +1,203 @@
+/** 
+ * @file sunLightF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#extension GL_ARB_texture_rectangle : enable
+
+uniform sampler2DRect depthMap;
+uniform sampler2DRect normalMap;
+uniform sampler2DRectShadow shadowMap0;
+uniform sampler2DRectShadow shadowMap1;
+uniform sampler2DRectShadow shadowMap2;
+uniform sampler2DRectShadow shadowMap3;
+uniform sampler2DRectShadow shadowMap4;
+uniform sampler2DRectShadow shadowMap5;
+uniform sampler2D noiseMap;
+
+uniform sampler2D               lightFunc;
+
+
+// Inputs
+uniform mat4 shadow_matrix[6];
+uniform vec4 shadow_clip;
+uniform float ssao_radius;
+uniform float ssao_max_radius;
+uniform float ssao_factor;
+uniform float ssao_factor_inv;
+
+varying vec2 vary_fragcoord;
+varying vec4 vary_light;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+
+uniform float shadow_bias;
+uniform float shadow_offset;
+
+vec4 getPosition(vec2 pos_screen)
+{
+        float depth = texture2DRect(depthMap, pos_screen.xy).a;
+        vec2 sc = pos_screen.xy*2.0;
+        sc /= screen_res;
+        sc -= vec2(1.0,1.0);
+        vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+        vec4 pos = inv_proj * ndc;
+        pos /= pos.w;
+        pos.w = 1.0;
+        return pos;
+}
+
+//calculate decreases in ambient lighting when crowded out (SSAO)
+float calcAmbientOcclusion(vec4 pos, vec3 norm)
+{
+        vec2 kern[8];
+        // exponentially (^2) distant occlusion samples spread around origin
+        kern[0] = vec2(-1.0, 0.0) * 0.125*0.125;
+        kern[1] = vec2(1.0, 0.0) * 0.250*0.250;
+        kern[2] = vec2(0.0, 1.0) * 0.375*0.375;
+        kern[3] = vec2(0.0, -1.0) * 0.500*0.500;
+        kern[4] = vec2(0.7071, 0.7071) * 0.625*0.625;
+        kern[5] = vec2(-0.7071, -0.7071) * 0.750*0.750;
+        kern[6] = vec2(-0.7071, 0.7071) * 0.875*0.875;
+        kern[7] = vec2(0.7071, -0.7071) * 1.000*1.000;
+
+        vec2 pos_screen = vary_fragcoord.xy;
+        vec3 pos_world = pos.xyz;
+        vec2 noise_reflect = texture2D(noiseMap, vary_fragcoord.xy/128.0).xy;
+        
+        float angle_hidden = 0.0;
+        int points = 0;
+        
+        float scale = min(ssao_radius / -pos_world.z, ssao_max_radius);
+        
+        // it was found that keeping # of samples a constant was the fastest, probably due to compiler optimizations (unrolling?)
+        for (int i = 0; i < 8; i++)
+        {
+                vec2 samppos_screen = pos_screen + scale * reflect(kern[i], noise_reflect);
+                vec3 samppos_world = getPosition(samppos_screen).xyz; 
+                
+                vec3 diff = pos_world - samppos_world;
+                float dist2 = dot(diff, diff);
+                
+                // assume each sample corresponds to an occluding sphere with constant radius, constant x-sectional area
+                // --> solid angle shrinking by the square of distance
+                //radius is somewhat arbitrary, can approx with just some constant k * 1 / dist^2
+                //(k should vary inversely with # of samples, but this is taken care of later)
+                
+                //if (dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0)  // -0.05*norm to shift sample point back slightly for flat surfaces
+                //      angle_hidden += min(1.0/dist2, ssao_factor_inv); // dist != 0 follows from conditional.  max of 1.0 (= ssao_factor_inv * ssao_factor)
+                angle_hidden = angle_hidden + float(dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) * min(1.0/dist2, ssao_factor_inv);
+                
+                // 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion" 
+                points = points + int(diff.z > -1.0);
+        }
+        
+        angle_hidden = min(ssao_factor*angle_hidden/float(points), 1.0);
+        
+        return (1.0 - (float(points != 0) * angle_hidden));
+}
+
+void main() 
+{
+        vec2 pos_screen = vary_fragcoord.xy;
+        
+        //try doing an unproject here
+        
+        vec4 pos = getPosition(pos_screen);
+        
+    vec3 norm = texture2DRect(normalMap, pos_screen).xyz*2.0-1.0;
+        
+        /*if (pos.z == 0.0) // do nothing for sky *FIX: REMOVE THIS IF/WHEN THE POSITION MAP IS BEING USED AS A STENCIL
+        {
+                gl_FragColor = vec4(0.0); // doesn't matter
+                return;
+        }*/
+        
+        float shadow = 1.0;
+    float dp_directional_light = max(0.0, dot(norm, vary_light.xyz));
+
+        vec4 spos = vec4(pos.xyz + norm.xyz * (-pos.z/64.0*shadow_offset+shadow_bias), 1.0);
+        
+        //vec3 debug = vec3(0,0,0);
+        
+        if (spos.z > -shadow_clip.w)
+        {       
+                if (dp_directional_light == 0.0)
+                {
+                        // if we know this point is facing away from the sun then we know it's in shadow without having to do a squirrelly shadow-map lookup
+                        shadow = 0.0;
+                }
+                else
+                {
+                        vec4 lpos;
+                        
+                        if (spos.z < -shadow_clip.z)
+                        {
+                                lpos = shadow_matrix[3]*spos;
+                                lpos.xy *= screen_res;
+                                shadow = shadow2DRectProj(shadowMap3, lpos).x;
+                                shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
+                        }
+                        else if (spos.z < -shadow_clip.y)
+                        {
+                                lpos = shadow_matrix[2]*spos;
+                                lpos.xy *= screen_res;
+                                shadow = shadow2DRectProj(shadowMap2, lpos).x;
+                        }
+                        else if (spos.z < -shadow_clip.x)
+                        {
+                                lpos = shadow_matrix[1]*spos;
+                                lpos.xy *= screen_res;
+                                shadow = shadow2DRectProj(shadowMap1, lpos).x;
+                        }
+                        else
+                        {
+                                lpos = shadow_matrix[0]*spos;
+                                lpos.xy *= screen_res;
+                                shadow = shadow2DRectProj(shadowMap0, lpos).x;
+                        }
+
+                        // take the most-shadowed value out of these two:
+                        //  * the blurred sun shadow in the light (shadow) map
+                        //  * an unblurred dot product between the sun and this norm
+                        // the goal is to err on the side of most-shadow to fill-in shadow holes and reduce artifacting
+                        shadow = min(shadow, dp_directional_light);
+                }
+                
+                /*debug.r = lpos.y / (lpos.w*screen_res.y);
+                
+                lpos.xy /= lpos.w*32.0;
+                if (fract(lpos.x) < 0.1 || fract(lpos.y) < 0.1)
+                {
+                        debug.gb = vec2(0.5, 0.5);
+                }
+                
+                debug += (1.0-shadow)*0.5;*/
+                
+        }
+        else
+        {
+                // more distant than the shadow map covers
+                shadow = 1.0;
+        }
+        
+        gl_FragColor[0] = shadow;
+        gl_FragColor[1] = calcAmbientOcclusion(pos, norm);
+        
+        //spotlight shadow 1
+        vec4 lpos = shadow_matrix[4]*spos;
+        lpos.xy *= screen_res;
+        gl_FragColor[2] = shadow2DRectProj(shadowMap4, lpos).x; 
+        
+        //spotlight shadow 2
+        lpos = shadow_matrix[5]*spos;
+        lpos.xy *= screen_res;
+        gl_FragColor[3] = shadow2DRectProj(shadowMap5, lpos).x; 
+
+        //gl_FragColor.rgb = pos.xyz;
+        //gl_FragColor.b = shadow;
+        //gl_FragColor.rgb = debug;
+}