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/**
* @file alphaF.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 frag_color;
#else
#define frag_color gl_FragColor
#endif
uniform sampler2DRectShadow shadowMap0;
uniform sampler2DRectShadow shadowMap1;
uniform sampler2DRectShadow shadowMap2;
uniform sampler2DRectShadow shadowMap3;
uniform sampler2DRect depthMap;
uniform sampler2D diffuseMap;
uniform mat4 shadow_matrix[6];
uniform vec4 shadow_clip;
uniform vec2 screen_res;
uniform vec2 shadow_res;
vec3 atmosLighting(vec3 light);
vec3 scaleSoftClip(vec3 light);
VARYING vec3 vary_ambient;
VARYING vec3 vary_directional;
VARYING vec3 vary_fragcoord;
VARYING vec3 vary_position;
VARYING vec3 vary_pointlight_col;
VARYING vec2 vary_texcoord0;
VARYING vec4 vertex_color;
uniform float shadow_bias;
uniform mat4 inv_proj;
vec4 getPosition(vec2 pos_screen)
{
float depth = texture2DRect(depthMap, pos_screen.xy).a;
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.xyz /= pos.w;
pos.w = 1.0;
return pos;
}
float pcfShadow(sampler2DRectShadow shadowMap, vec4 stc)
{
stc.xyz /= stc.w;
stc.z += shadow_bias;
stc.x = floor(stc.x + fract(stc.y*12345)); // add some chaotic jitter to X sample pos according to Y to disguise the snapping going on here
float cs = shadow2DRect(shadowMap, stc.xyz).x;
float shadow = cs;
shadow += shadow2DRect(shadowMap, stc.xyz+vec3(2.0, 1.5, 0.0)).x;
shadow += shadow2DRect(shadowMap, stc.xyz+vec3(1.0, -1.5, 0.0)).x;
shadow += shadow2DRect(shadowMap, stc.xyz+vec3(-1.0, 1.5, 0.0)).x;
shadow += shadow2DRect(shadowMap, stc.xyz+vec3(-2.0, -1.5, 0.0)).x;
return shadow*0.2;
}
void main()
{
vec2 frag = vary_fragcoord.xy/vary_fragcoord.z*0.5+0.5;
frag *= screen_res;
float shadow = 0.0;
vec4 pos = vec4(vary_position, 1.0);
vec4 spos = pos;
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;
lpos.xy *= shadow_res;
float w = 1.0;
w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
shadow += pcfShadow(shadowMap3, lpos)*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;
lpos.xy *= shadow_res;
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)*w;
weight += w;
}
if (spos.z < near_split.x && spos.z > far_split.y)
{
lpos = shadow_matrix[1]*spos;
lpos.xy *= shadow_res;
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)*w;
weight += w;
}
if (spos.z > far_split.x)
{
lpos = shadow_matrix[0]*spos;
lpos.xy *= shadow_res;
float w = 1.0;
w -= max(near_split.x-spos.z, 0.0)/transition_domain.x;
shadow += pcfShadow(shadowMap0, lpos)*w;
weight += w;
}
shadow /= weight;
}
else
{
shadow = 1.0;
}
vec4 diff = texture2D(diffuseMap,vary_texcoord0.xy);
vec4 col = vec4(vary_ambient + vary_directional.rgb*shadow, vertex_color.a);
vec4 color = diff * col;
color.rgb = atmosLighting(color.rgb);
color.rgb = scaleSoftClip(color.rgb);
color.rgb += diff.rgb * vary_pointlight_col.rgb;
frag_color = color;
}
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