SL-10055

Modify handling of directional light to prefer sun when it is up but use moon dir/color when it is alone in the sky.

Modify handling of shader in shaders to get some shadowing of ambient and nighttime shadowing.

1 files changed, 169 insertions, 163 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
index 43f0034874..ec05dab57f 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file shadowUtil.glsl
+ * @file class1/deferred/deferredUtil.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
@@ -39,6 +39,7 @@ uniform float ssao_factor;
 uniform float ssao_factor_inv;
 
 uniform vec3 sun_dir;
+uniform vec3 moon_dir;
 uniform vec2 shadow_res;
 uniform vec2 proj_shadow_res;
 uniform mat4 shadow_matrix[6];
@@ -55,7 +56,7 @@ vec3 decode_normal(vec2 enc);
 
 vec2 getScreenCoordinate(vec2 screenpos)
 {
-	vec2 sc = screenpos.xy * 2.0;
+    vec2 sc = screenpos.xy * 2.0;
     if (screen_res.x > 0 && screen_res.y > 0)
     {
        sc /= screen_res;
@@ -72,41 +73,41 @@ vec3 getNorm(vec2 screenpos)
 float getDepth(vec2 pos_screen)
 {
     float depth = texture2DRect(depthMap, pos_screen).r;
-	return depth;
+    return depth;
 }
 
 vec4 getPosition(vec2 pos_screen)
 {
     float depth = getDepth(pos_screen);
-	vec2 sc = getScreenCoordinate(pos_screen);
-	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;
+    vec2 sc = getScreenCoordinate(pos_screen);
+    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;
 }
 
 #if USE_DEFERRED_SHADER_API
 
 vec4 getPositionWithDepth(vec2 pos_screen, float depth)
 {
-	vec2 sc = getScreenCoordinate(pos_screen);
-	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;
+    vec2 sc = getScreenCoordinate(pos_screen);
+    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;
 }
 
 float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float bias_scale, vec2 pos_screen)
 {
-	stc.xyz /= stc.w;
-	stc.z += shadow_bias * bias_scale;
-		
-	stc.x = floor(stc.x*pos_screen.x + fract(stc.y*shadow_res.y*12345))/shadow_res.x; // add some chaotic jitter to X sample pos according to Y to disguise the snapping going on here
-	
-	float cs = shadow2D(shadowMap, stc.xyz).x;
-	float shadow = cs;
+    stc.xyz /= stc.w;
+    stc.z += shadow_bias * bias_scale;
+        
+    stc.x = floor(stc.x*pos_screen.x + fract(stc.y*shadow_res.y*12345))/shadow_res.x; // add some chaotic jitter to X sample pos according to Y to disguise the snapping going on here
+    
+    float cs = shadow2D(shadowMap, stc.xyz).x;
+    float shadow = cs;
     shadow += shadow2D(shadowMap, stc.xyz+vec3(2.0/shadow_res.x, 1.5/shadow_res.y, 0.0)).x;
     shadow += shadow2D(shadowMap, stc.xyz+vec3(1.0/shadow_res.x, -1.5/shadow_res.y, 0.0)).x;
     shadow += shadow2D(shadowMap, stc.xyz+vec3(-1.0/shadow_res.x, 1.5/shadow_res.y, 0.0)).x;
@@ -116,85 +117,90 @@ float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float bias_scale, vec2 pos_
 
 float pcfSpotShadow(sampler2DShadow shadowMap, vec4 stc, float bias_scale, vec2 pos_screen)
 {
-	stc.xyz /= stc.w;
-	stc.z += spot_shadow_bias * bias_scale;
-	stc.x = floor(proj_shadow_res.x * stc.x + fract(pos_screen.y*0.666666666)) / proj_shadow_res.x; // snap
-
-	float cs = shadow2D(shadowMap, stc.xyz).x;
-	float shadow = cs;
-
-	vec2 off = 1.0/proj_shadow_res;
-	off.y *= 1.5;
-	
-	shadow += shadow2D(shadowMap, stc.xyz+vec3(off.x*2.0, off.y, 0.0)).x;
-	shadow += shadow2D(shadowMap, stc.xyz+vec3(off.x, -off.y, 0.0)).x;
-	shadow += shadow2D(shadowMap, stc.xyz+vec3(-off.x, off.y, 0.0)).x;
-	shadow += shadow2D(shadowMap, stc.xyz+vec3(-off.x*2.0, -off.y, 0.0)).x;
+    stc.xyz /= stc.w;
+    stc.z += spot_shadow_bias * bias_scale;
+    stc.x = floor(proj_shadow_res.x * stc.x + fract(pos_screen.y*0.666666666)) / proj_shadow_res.x; // snap
+
+    float cs = shadow2D(shadowMap, stc.xyz).x;
+    float shadow = cs;
+
+    vec2 off = 1.0/proj_shadow_res;
+    off.y *= 1.5;
+    
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(off.x*2.0, off.y, 0.0)).x;
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(off.x, -off.y, 0.0)).x;
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(-off.x, off.y, 0.0)).x;
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(-off.x*2.0, -off.y, 0.0)).x;
     return shadow*0.2;
 }
 
 float sampleDirectionalShadow(vec3 pos, vec3 norm, vec2 pos_screen)
 {
-	float dp_directional_light = max(0.0, dot(sun_dir.xyz, norm));
-	vec3 offset = sun_dir.xyz * (1.0-dp_directional_light);
-	vec3 shadow_pos = pos.xyz + (offset * shadow_bias);
+    float dp_sun = max(0.0, dot(sun_dir.xyz, norm));
+    float dp_moon = max(0.0, dot(moon_dir.xyz, norm));
+    float dp_directional_light = max(dp_sun,dp_moon);
+          dp_directional_light = clamp(dp_directional_light, 0.0, 1.0);
+
+        vec3 light_dir = (dp_moon > dp_sun) ? moon_dir : sun_dir;
+    vec3 offset = light_dir * (1.0-dp_directional_light);
+    vec3 shadow_pos = pos.xyz + (offset * shadow_bias);
 
     float shadow = 0.0f;
-	vec4 spos = vec4(shadow_pos,1.0);
-	if (spos.z > -shadow_clip.w)
-	{	
-		vec4 lpos;
-		vec4 near_split = shadow_clip*-0.75;
-		vec4 far_split = shadow_clip*-1.25;
-		vec4 transition_domain = near_split-far_split;
-		float weight = 0.0;
-
-		if (spos.z < near_split.z)
-		{
-			lpos = shadow_matrix[3]*spos;
-			
-			float w = 1.0;
-			w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
-			shadow += pcfShadow(shadowMap3, lpos, 0.5, pos_screen)*w;
-			weight += w;
-			shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
-		}
-
-		if (spos.z < near_split.y && spos.z > far_split.z)
-		{
-			lpos = shadow_matrix[2]*spos;
-			
-			float w = 1.0;
-			w -= max(spos.z-far_split.y, 0.0)/transition_domain.y;
-			w -= max(near_split.z-spos.z, 0.0)/transition_domain.z;
-			shadow += pcfShadow(shadowMap2, lpos, 0.75, pos_screen)*w;
-			weight += w;
-		}
-
-		if (spos.z < near_split.x && spos.z > far_split.y)
-		{
-			lpos = shadow_matrix[1]*spos;
-			
-			float w = 1.0;
-			w -= max(spos.z-far_split.x, 0.0)/transition_domain.x;
-			w -= max(near_split.y-spos.z, 0.0)/transition_domain.y;
-			shadow += pcfShadow(shadowMap1, lpos, 0.88, pos_screen)*w;
-			weight += w;
-		}
-
-		if (spos.z > far_split.x)
-		{
-			lpos = shadow_matrix[0]*spos;
-							
-			float w = 1.0;
-			w -= max(near_split.x-spos.z, 0.0)/transition_domain.x;
-				
-			shadow += pcfShadow(shadowMap0, lpos, 1.0, pos_screen)*w;
-			weight += w;
-		}
-
-		shadow /= weight;
-	}
+    vec4 spos = vec4(shadow_pos,1.0);
+    if (spos.z > -shadow_clip.w)
+    {   
+        vec4 lpos;
+        vec4 near_split = shadow_clip*-0.75;
+        vec4 far_split = shadow_clip*-1.25;
+        vec4 transition_domain = near_split-far_split;
+        float weight = 0.0;
+
+        if (spos.z < near_split.z)
+        {
+            lpos = shadow_matrix[3]*spos;
+            
+            float w = 1.0;
+            w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
+            shadow += pcfShadow(shadowMap3, lpos, 0.5, pos_screen)*w;
+            weight += w;
+            shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
+        }
+
+        if (spos.z < near_split.y && spos.z > far_split.z)
+        {
+            lpos = shadow_matrix[2]*spos;
+            
+            float w = 1.0;
+            w -= max(spos.z-far_split.y, 0.0)/transition_domain.y;
+            w -= max(near_split.z-spos.z, 0.0)/transition_domain.z;
+            shadow += pcfShadow(shadowMap2, lpos, 0.75, pos_screen)*w;
+            weight += w;
+        }
+
+        if (spos.z < near_split.x && spos.z > far_split.y)
+        {
+            lpos = shadow_matrix[1]*spos;
+            
+            float w = 1.0;
+            w -= max(spos.z-far_split.x, 0.0)/transition_domain.x;
+            w -= max(near_split.y-spos.z, 0.0)/transition_domain.y;
+            shadow += pcfShadow(shadowMap1, lpos, 0.88, pos_screen)*w;
+            weight += w;
+        }
+
+        if (spos.z > far_split.x)
+        {
+            lpos = shadow_matrix[0]*spos;
+                            
+            float w = 1.0;
+            w -= max(near_split.x-spos.z, 0.0)/transition_domain.x;
+                
+            shadow += pcfShadow(shadowMap0, lpos, 1.0, pos_screen)*w;
+            weight += w;
+        }
+
+        shadow /= weight;
+    }
     return shadow;
 }
 
@@ -203,88 +209,88 @@ float sampleSpotShadow(vec3 pos, vec3 norm, int index, vec2 pos_screen)
     float shadow = 0.0f;
     pos += norm * spot_shadow_offset;
 
-	vec4 spos = vec4(pos,1.0);
-	if (spos.z > -shadow_clip.w)
-	{	
-		vec4 lpos;
-		
-		vec4 near_split = shadow_clip*-0.75;
-		vec4 far_split = shadow_clip*-1.25;
-		vec4 transition_domain = near_split-far_split;
-		float weight = 0.0;
+    vec4 spos = vec4(pos,1.0);
+    if (spos.z > -shadow_clip.w)
+    {   
+        vec4 lpos;
+        
+        vec4 near_split = shadow_clip*-0.75;
+        vec4 far_split = shadow_clip*-1.25;
+        vec4 transition_domain = near_split-far_split;
+        float weight = 0.0;
 
         {
-			lpos = shadow_matrix[4 + index]*spos;
-			float w = 1.0;
-			w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
-		
-			shadow += pcfSpotShadow((index == 0) ? shadowMap4 : shadowMap5, lpos, 0.8, spos.xy)*w;
-			weight += w;
-			shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
-		}
-
-		shadow /= weight;
-	}
+            lpos = shadow_matrix[4 + index]*spos;
+            float w = 1.0;
+            w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
+        
+            shadow += pcfSpotShadow((index == 0) ? shadowMap4 : shadowMap5, lpos, 0.8, spos.xy)*w;
+            weight += w;
+            shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
+        }
+
+        shadow /= weight;
+    }
     return shadow;
 }
 
 vec2 getKern(int i)
 {
-	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 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;
        
-	return kern[i];
+    return kern[i];
 }
 
 //calculate decreases in ambient lighting when crowded out (SSAO)
 float calcAmbientOcclusion(vec4 pos, vec3 norm, vec2 pos_screen)
 {
-	float ret = 1.0;
-	vec3 pos_world = pos.xyz;
-	vec2 noise_reflect = texture2D(noiseMap, pos_screen.xy/128.0).xy;
-		
-	float angle_hidden = 0.0;
-	float 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(getKern(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)
-		
-		float funky_val = (dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) ? 1.0 : 0.0;
-		angle_hidden = angle_hidden + funky_val * min(1.0/dist2, ssao_factor_inv);
-			
-		// 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion" 
-		float diffz_val = (diff.z > -1.0) ? 1.0 : 0.0;
-		points = points + diffz_val;
-	}
-		
-	angle_hidden = min(ssao_factor*angle_hidden/points, 1.0);
-	
-	float points_val = (points > 0.0) ? 1.0 : 0.0;
-	ret = (1.0 - (points_val * angle_hidden));
-
-	ret = max(ret, 0.0);
-	return min(ret, 1.0);
+    float ret = 1.0;
+    vec3 pos_world = pos.xyz;
+    vec2 noise_reflect = texture2D(noiseMap, pos_screen.xy/128.0).xy;
+        
+    float angle_hidden = 0.0;
+    float 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(getKern(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)
+        
+        float funky_val = (dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) ? 1.0 : 0.0;
+        angle_hidden = angle_hidden + funky_val * min(1.0/dist2, ssao_factor_inv);
+            
+        // 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion" 
+        float diffz_val = (diff.z > -1.0) ? 1.0 : 0.0;
+        points = points + diffz_val;
+    }
+        
+    angle_hidden = min(ssao_factor*angle_hidden/points, 1.0);
+    
+    float points_val = (points > 0.0) ? 1.0 : 0.0;
+    ret = (1.0 - (points_val * angle_hidden));
+
+    ret = max(ret, 0.0);
+    return min(ret, 1.0);
 }
 
 #endif