diff options
Diffstat (limited to 'indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl')
| -rw-r--r-- | indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl | 144 |
1 files changed, 102 insertions, 42 deletions
diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl index d53850b489..02075a7687 100644 --- a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl +++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl @@ -1,14 +1,35 @@ /** * @file sunLightSSAOF.glsl - * - * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc. - * $License$ + * $LicenseInfo:firstyear=2007&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2007, Linden Research, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; + * version 2.1 of the License only. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA + * $/LicenseInfo$ */ - - #extension GL_ARB_texture_rectangle : enable +#ifdef DEFINE_GL_FRAGCOLOR +out vec4 frag_color; +#else +#define frag_color gl_FragColor +#endif + //class 2 -- shadows and SSAO uniform sampler2DRect depthMap; @@ -21,6 +42,7 @@ uniform sampler2DShadow shadowMap4; uniform sampler2DShadow shadowMap5; uniform sampler2D noiseMap; + // Inputs uniform mat4 shadow_matrix[6]; uniform vec4 shadow_clip; @@ -29,13 +51,13 @@ uniform float ssao_max_radius; uniform float ssao_factor; uniform float ssao_factor_inv; -varying vec2 vary_fragcoord; -varying vec4 vary_light; +VARYING vec2 vary_fragcoord; uniform mat4 inv_proj; uniform vec2 screen_res; uniform vec2 shadow_res; uniform vec2 proj_shadow_res; +uniform vec3 sun_dir; uniform float shadow_bias; uniform float shadow_offset; @@ -56,11 +78,8 @@ vec4 getPosition(vec2 pos_screen) return pos; } -//calculate decreases in ambient lighting when crowded out (SSAO) -float calcAmbientOcclusion(vec4 pos, vec3 norm) +vec2 getKern(int i) { - float ret = 1.0; - vec2 kern[8]; // exponentially (^2) distant occlusion samples spread around origin kern[0] = vec2(-1.0, 0.0) * 0.125*0.125; @@ -71,22 +90,30 @@ float calcAmbientOcclusion(vec4 pos, vec3 norm) 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; - int points = 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(kern[i], noise_reflect); + 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); @@ -94,17 +121,21 @@ float calcAmbientOcclusion(vec4 pos, vec3 norm) // --> 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) - - angle_hidden = angle_hidden + float(dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) * min(1.0/dist2, ssao_factor_inv); + + 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" - points = points + int(diff.z > -1.0); + float diffz_val = (diff.z > -1.0) ? 1.0 : 0.0; + points = points + diffz_val; } - angle_hidden = min(ssao_factor*angle_hidden/float(points), 1.0); - - ret = (1.0 - (float(points != 0) * angle_hidden)); + 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); } @@ -141,7 +172,6 @@ float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl) shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, off.y, 0.0)).x, cs); shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, -off.y, 0.0)).x, cs); - return shadow/5.0; //return shadow; @@ -162,15 +192,15 @@ void main() /*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 + frag_color = vec4(0.0); // doesn't matter return; }*/ - float shadow = 1.0; - float dp_directional_light = max(0.0, dot(norm, vary_light.xyz)); + float shadow = 0.0; + float dp_directional_light = max(0.0, dot(norm, sun_dir.xyz)); vec3 shadow_pos = pos.xyz + displace*norm; - vec3 offset = vary_light.xyz * (1.0-dp_directional_light); + vec3 offset = sun_dir.xyz * (1.0-dp_directional_light); vec4 spos = vec4(shadow_pos+offset*shadow_offset, 1.0); @@ -184,33 +214,63 @@ void main() else { vec4 lpos; - - if (spos.z < -shadow_clip.z) + + 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; lpos.xy *= shadow_res; - shadow = pcfShadow(shadowMap3, lpos, 0.25); + + float w = 1.0; + w -= max(spos.z-far_split.z, 0.0)/transition_domain.z; + shadow += pcfShadow(shadowMap3, lpos, 0.25)*w; + weight += w; 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) + + if (spos.z < near_split.y && spos.z > far_split.z) { lpos = shadow_matrix[2]*spos; lpos.xy *= shadow_res; - shadow = pcfShadow(shadowMap2, lpos, 0.5); + + 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)*w; + weight += w; } - else if (spos.z < -shadow_clip.x) + + if (spos.z < near_split.x && spos.z > far_split.y) { lpos = shadow_matrix[1]*spos; lpos.xy *= shadow_res; - shadow = pcfShadow(shadowMap1, lpos, 0.75); + + 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)*w; + weight += w; } - else + + if (spos.z > far_split.x) { lpos = shadow_matrix[0]*spos; lpos.xy *= shadow_res; - shadow = pcfShadow(shadowMap0, lpos, 1.0); + + float w = 1.0; + w -= max(near_split.x-spos.z, 0.0)/transition_domain.x; + + shadow += pcfShadow(shadowMap0, lpos, 1.0)*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 @@ -231,19 +291,19 @@ void main() shadow = 1.0; } - gl_FragColor[0] = shadow; - gl_FragColor[1] = calcAmbientOcclusion(pos, norm); + frag_color[0] = shadow; + frag_color[1] = calcAmbientOcclusion(pos, norm); - spos.xyz = shadow_pos+norm*spot_shadow_offset; + spos = vec4(shadow_pos+norm*spot_shadow_offset, 1.0); //spotlight shadow 1 vec4 lpos = shadow_matrix[4]*spos; - gl_FragColor[2] = pcfShadow(shadowMap4, lpos, 0.8); + frag_color[2] = pcfShadow(shadowMap4, lpos, 0.8); //spotlight shadow 2 lpos = shadow_matrix[5]*spos; - gl_FragColor[3] = pcfShadow(shadowMap5, lpos, 0.8); + frag_color[3] = pcfShadow(shadowMap5, lpos, 0.8); - //gl_FragColor.rgb = pos.xyz; - //gl_FragColor.b = shadow; + //frag_color.rgb = pos.xyz; + //frag_color.b = shadow; } |