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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
#define INDEXED 1
#define NON_INDEXED 2
#define NON_INDEXED_NO_COLOR 3
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_color;
#else
#define frag_color gl_FragColor
#endif
uniform sampler2DShadow shadowMap0;
uniform sampler2DShadow shadowMap1;
uniform sampler2DShadow shadowMap2;
uniform sampler2DShadow shadowMap3;
uniform sampler2DRect depthMap;
#if INDEX_MODE != INDEXED
uniform sampler2D diffuseMap;
#endif
uniform vec2 screen_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 vec3 vary_norm;
#if INDEX_MODE != NON_INDEXED_NO_COLOR
VARYING vec4 vertex_color;
#endif
uniform mat4 shadow_matrix[6];
uniform vec4 shadow_clip;
uniform vec2 shadow_res;
uniform float shadow_bias;
uniform mat4 inv_proj;
uniform vec4 light_position[8];
uniform vec3 light_direction[8];
uniform vec3 light_attenuation[8];
uniform vec3 light_diffuse[8];
float calcDirectionalLight(vec3 n, vec3 l)
{
float a = pow(max(dot(n,l),0.0), 0.7);
return a;
}
float calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, float fa, float is_pointlight)
{
//get light vector
vec3 lv = lp.xyz-v;
//get distance
float d = dot(lv,lv);
float da = 0.0;
if (d > 0.0 && la > 0.0 && fa > 0.0)
{
//normalize light vector
lv = normalize(lv);
//distance attenuation
float dist2 = d/la;
da = clamp(1.0-(dist2-1.0*(1.0-fa))/fa, 0.0, 1.0);
// spotlight coefficient.
float spot = max(dot(-ln, lv), is_pointlight);
da *= spot*spot; // GL_SPOT_EXPONENT=2
//angular attenuation
da *= max(pow(dot(n, lv), 0.7), 0.0);
}
return da;
}
float pcfShadow(sampler2DShadow shadowMap, vec4 stc)
{
stc.xyz /= stc.w;
stc.z += shadow_bias;
stc.x = floor(stc.x*shadow_res.x + fract(stc.y*shadow_res.y*12345))/shadow_res.x; // add some chaotic 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(-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;
}
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;
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;
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;
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;
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;
}
vec3 dlight = calcDirectionalLight(vary_norm, light_position[0].xyz) * vary_directional.rgb * vary_pointlight_col;
#if INDEX_MODE == INDEXED
vec4 diff = diffuseLookup(vary_texcoord0.xy);
#else
vec4 diff = texture2D(diffuseMap,vary_texcoord0.xy);
#endif
#if INDEX_MODE == NON_INDEXED_NO_COLOR
float vertex_color_alpha = 1.0;
#else
float vertex_color_alpha = vertex_color.a;
#endif
vec4 col = vec4(vary_ambient + dlight *shadow, vertex_color_alpha);
vec4 color = diff * col;
color.rgb = atmosLighting(color.rgb);
color.rgb = scaleSoftClip(color.rgb);
vec3 light_col = vec3(0,0,0);
for (int i = 2; i < 8; i++)
{
light_col += light_diffuse[i].rgb * calcPointLightOrSpotLight(pos.xyz, vary_norm, light_position[i], light_direction[i], light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z);
}
color.rgb += diff.rgb * vary_pointlight_col * light_col;
frag_color = color;
}
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