/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
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Possible License(s): LGPL-2.1
- /**
- * @file sunLightF.glsl
- *
- * $LicenseInfo:firstyear=2007&license=viewerlgpl$
- * 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 gl_FragColor;
- #endif
- //class 2, shadows, no SSAO
- uniform sampler2DRect depthMap;
- uniform sampler2DRect normalMap;
- uniform sampler2DRectShadow shadowMap0;
- uniform sampler2DRectShadow shadowMap1;
- uniform sampler2DRectShadow shadowMap2;
- uniform sampler2DRectShadow 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 shadow_res;
- uniform vec2 proj_shadow_res;
- uniform vec3 sun_dir;
- uniform float shadow_bias;
- uniform float shadow_offset;
- uniform float spot_shadow_bias;
- uniform float spot_shadow_offset;
- 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;
- }
- float pcfShadow(sampler2DRectShadow shadowMap, vec4 stc, float scl)
- {
- stc.xyz /= stc.w;
- stc.z += shadow_bias*scl;
-
- float cs = shadow2DRect(shadowMap, stc.xyz).x;
- float shadow = cs;
- shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, 1.5, 0.0)).x, cs);
- shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, -1.5, 0.0)).x, cs);
- shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, 1.5, 0.0)).x, cs);
- shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, -1.5, 0.0)).x, cs);
-
- return shadow/5.0;
-
- //return shadow;
- }
- float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
- {
- stc.xyz /= stc.w;
- stc.z += spot_shadow_bias*scl;
-
- float cs = shadow2D(shadowMap, stc.xyz).x;
- float shadow = cs;
- vec2 off = 1.5/proj_shadow_res;
-
- 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);
- 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;
- }
- void main()
- {
- vec2 pos_screen = vary_fragcoord.xy;
-
- //try doing an unproject here
-
- vec4 pos = getPosition(pos_screen);
-
- vec4 nmap4 = texture2DRect(normalMap, pos_screen);
- nmap4 = vec4((nmap4.xy-0.5)*2.0,nmap4.z,nmap4.w); // unpack norm
- float displace = nmap4.w;
- vec3 norm = nmap4.xyz;
-
- /*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, sun_dir.xyz));
- vec3 shadow_pos = pos.xyz + displace*norm;
- 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;
-
- if (spos.z < -shadow_clip.z)
- {
- lpos = shadow_matrix[3]*spos;
- lpos.xy *= shadow_res;
- shadow = pcfShadow(shadowMap3, lpos, 0.25);
- 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 *= shadow_res;
- shadow = pcfShadow(shadowMap2, lpos, 0.5);
- }
- else if (spos.z < -shadow_clip.x)
- {
- lpos = shadow_matrix[1]*spos;
- lpos.xy *= shadow_res;
- shadow = pcfShadow(shadowMap1, lpos, 0.75);
- }
- else
- {
- lpos = shadow_matrix[0]*spos;
- lpos.xy *= shadow_res;
- shadow = pcfShadow(shadowMap0, lpos, 1.0);
- }
-
- // 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;
- }
-
- gl_FragColor[0] = shadow;
- gl_FragColor[1] = 1.0;
-
- 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);
-
- //spotlight shadow 2
- lpos = shadow_matrix[5]*spos;
- gl_FragColor[3] = pcfShadow(shadowMap5, lpos, 0.8);
- //gl_FragColor.rgb = pos.xyz;
- //gl_FragColor.b = shadow;
- }