Convert to using shared shadow sampling function (reduce duplicated code blocks in several shaders).

1 files changed, 11 insertions, 192 deletions

diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
index 5f8f3114a1..fc5756beef 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
@@ -35,208 +35,27 @@ out vec4 frag_color;
 
 //class 2, shadows, no SSAO
 
-uniform sampler2DRect depthMap;
-uniform sampler2DRect normalMap;
-uniform sampler2DShadow shadowMap0;
-uniform sampler2DShadow shadowMap1;
-uniform sampler2DShadow shadowMap2;
-uniform sampler2DShadow shadowMap3;
-uniform sampler2DShadow shadowMap4;
-uniform sampler2DShadow shadowMap5;
-
-
 // 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;
 
-uniform mat4 inv_proj;
-uniform vec2 screen_res;
-uniform vec2 proj_shadow_res;
 uniform vec3 sun_dir;
-uniform vec3 moon_dir;
-
-uniform vec2 shadow_res;
 uniform float shadow_bias;
-uniform float shadow_offset;
-
-uniform float spot_shadow_bias;
-uniform float spot_shadow_offset;
 
 vec3 getNorm(vec2 pos_screen);
+vec3 decode_normal (vec2 enc);
 vec4 getPosition(vec2 pos_screen);
 
-float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl, vec2 pos_screen);
-float pcfSpotShadow(sampler2DShadow shadowMap, vec4 stc, float scl, vec2 pos_screen);
-
-float pcfShadowLegacy(sampler2DShadow shadowMap, vec4 stc, float scl, vec2 pos_screen)
-{
-	stc.xyz /= stc.w;
-	stc.z += shadow_bias;
-
-	stc.x = floor(stc.x*shadow_res.x + fract(pos_screen.y*0.666666666))/shadow_res.x; // add some 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(-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;
-
-			
-    return shadow*0.2;
-}
-
-float pcfSpotShadowLegacy(sampler2DShadow shadowMap, vec4 stc, float scl, vec2 pos_screen)
-{
-	stc.xyz /= stc.w;
-	stc.z += spot_shadow_bias*scl;
-	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 sampleSpotShadow(vec3 pos, vec3 norm, int index, vec2 pos_screen);
 
 void main() 
 {
-	vec2 pos_screen = vary_fragcoord.xy;
-	
-	//try doing an unproject here
-	
-	vec4 pos  = getPosition(pos_screen);	
-	vec3 norm = getNorm(pos_screen);
-		
-	/*if (pos.z == 0.0) // do nothing for sky *FIX: REMOVE THIS IF/WHEN THE POSITION MAP IS BEING USED AS A STENCIL
-	{
-		frag_color = vec4(0.0); // doesn't matter
-		return;
-	}*/
-	
-	float shadow  = 0.0;
-	float dp_sun  = dot(norm, normalize(sun_dir.xyz));
-	float dp_moon = dot(norm, normalize(moon_dir.xyz));
-	float dp_directional_light = max(dp_sun, dp_moon);
-        dp_directional_light = clamp(dp_directional_light, 0.0, 1.0);
-
-        vec3 light_direction = (dp_moon > dp_sun) ? moon_dir : sun_dir;	
-
-	vec3 shadow_pos = pos.xyz;
-	vec3 offset = light_direction.xyz * (1.0-dp_directional_light);
-	
-	vec4 spos = vec4(shadow_pos+offset*shadow_offset, 1.0);
-	
-	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;
-			
-			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 += pcfShadowLegacy(shadowMap3, lpos, 0.25, 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 += pcfShadowLegacy(shadowMap2, lpos, 0.5, 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 += pcfShadowLegacy(shadowMap1, lpos, 0.75, 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 += pcfShadowLegacy(shadowMap0, lpos, 1.0, pos_screen)*w;
-				weight += w;
-			}
-		
-
-			shadow /= weight;
-
-			// 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);
-			
-			//lpos.xy /= lpos.w*32.0;
-			//if (fract(lpos.x) < 0.1 || fract(lpos.y) < 0.1)
-			//{
-			//	shadow = 0.0;
-			//}
-			
-		}
-	}
-	else
-	{
-		// more distant than the shadow map covers
-		shadow = 1.0;
-	}
-	
-	frag_color[0] = shadow;
-	frag_color[1] = 1.0;
-	
-	spos = vec4(shadow_pos+norm*spot_shadow_offset, 1.0);
-	
-	//spotlight shadow 1
-	vec4 lpos = shadow_matrix[4]*spos;
-	frag_color[2] = pcfSpotShadowLegacy(shadowMap4, lpos, 0.8, pos_screen); 
-	
-	//spotlight shadow 2
-	lpos = shadow_matrix[5]*spos;
-	frag_color[3] = pcfSpotShadowLegacy(shadowMap5, lpos, 0.8, pos_screen); 
-
-	//frag_color.rgb = pos.xyz;
-	//frag_color.b = shadow;
+    vec2 pos_screen = vary_fragcoord.xy;
+    vec4 pos        = getPosition(pos_screen);
+    vec3 norm       = getNorm(pos_screen);
+
+    frag_color.r = sampleDirectionalShadow(pos.xyz, norm, pos_screen);
+    frag_color.g = 1.0f;
+    frag_color.b = sampleSpotShadow(pos.xyz, norm, 0, pos_screen); 
+    frag_color.a = sampleSpotShadow(pos.xyz, norm, 1, pos_screen);
 }