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-rw-r--r--indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl292
1 files changed, 13 insertions, 279 deletions
diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
index 5c6fe30daa..64d99bae2c 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
@@ -1,5 +1,5 @@
/**
- * @file sunLightSSAOF.glsl
+ * @file class2/deferred/sunLightSSAOF.glsl
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2007, Linden Research, Inc.
@@ -34,290 +34,24 @@ out vec4 frag_color;
//class 2 -- shadows and 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;
-uniform sampler2D noiseMap;
-
-
// 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 vec2 shadow_res;
-
-uniform float shadow_bias;
-uniform float shadow_offset;
-
-uniform float spot_shadow_bias;
-uniform float spot_shadow_offset;
-
-vec2 encode_normal(vec3 n)
-{
- float f = sqrt(8 * n.z + 8);
- return n.xy / f + 0.5;
-}
-
-vec3 decode_normal (vec2 enc)
-{
- vec2 fenc = enc*4-2;
- float f = dot(fenc,fenc);
- float g = sqrt(1-f/4);
- vec3 n;
- n.xy = fenc*g;
- n.z = 1-f/2;
- return n;
-}
-
-vec4 getPosition(vec2 pos_screen)
-{
- float depth = texture2DRect(depthMap, pos_screen.xy).r;
- 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;
-}
-
-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;
-
- return kern[i];
-}
-
-//calculate decreases in ambient lighting when crowded out (SSAO)
-float calcAmbientOcclusion(vec4 pos, vec3 norm)
-{
- float ret = 1.0;
-
- 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;
- 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 pcfShadow(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;
- 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;
- shadow += shadow2D(shadowMap, stc.xyz+vec3(-2.0/shadow_res.x, -1.5/shadow_res.y, 0.0)).x;
-
- return shadow*0.2;
-}
-
-float pcfSpotShadow(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;
+vec4 getPosition(vec2 pos_screen);
+vec3 getNorm(vec2 pos_screen);
- 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 shadow_pos, vec3 norm, vec2 pos_screen);
+float sampleSpotShadow(vec3 shadow_pos, vec3 norm, int index, vec2 pos_screen);
+float calcAmbientOcclusion(vec4 pos, vec3 norm, vec2 pos_screen);
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;
- norm = decode_normal(norm.xy); // unpack norm
-
- /*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_directional_light = max(0.0, dot(norm, sun_dir.xyz));
-
- vec3 shadow_pos = pos.xyz;
- vec3 offset = sun_dir.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 += pcfShadow(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 += pcfShadow(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 += pcfShadow(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 += pcfShadow(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] = calcAmbientOcclusion(pos, norm);
-
- spos = vec4(shadow_pos+norm*spot_shadow_offset, 1.0);
-
- //spotlight shadow 1
- vec4 lpos = shadow_matrix[4]*spos;
- frag_color[2] = pcfSpotShadow(shadowMap4, lpos, 0.8, pos_screen);
-
- //spotlight shadow 2
- lpos = shadow_matrix[5]*spos;
- frag_color[3] = pcfSpotShadow(shadowMap5, lpos, 0.8, pos_screen);
+ vec2 pos_screen = vary_fragcoord.xy;
+ vec4 pos = getPosition(pos_screen);
+ vec3 norm = getNorm(pos_screen);
- //frag_color.rgb = pos.xyz;
- //frag_color.b = shadow;
+ frag_color.r = sampleDirectionalShadow(pos.xyz, norm, pos_screen);
+ frag_color.g = calcAmbientOcclusion(pos, norm, pos_screen);
+ frag_color.b = sampleSpotShadow(pos.xyz, norm, 0, pos_screen);
+ frag_color.a = sampleSpotShadow(pos.xyz, norm, 1, pos_screen);
}
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