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/**
* @file multiPointLightF.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 sampler2DRect depthMap;
uniform sampler2DRect diffuseRect;
uniform sampler2DRect specularRect;
uniform sampler2DRect normalMap;
uniform samplerCube environmentMap;
uniform sampler2D noiseMap;
uniform sampler2D lightFunc;
uniform vec3 env_mat[3];
uniform float sun_wash;
uniform int light_count;
#define MAX_LIGHT_COUNT 16
uniform vec4 light[MAX_LIGHT_COUNT];
uniform vec4 light_col[MAX_LIGHT_COUNT];
VARYING vec4 vary_fragcoord;
uniform vec2 screen_res;
uniform float far_z;
uniform mat4 inv_proj;
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;
}
void main()
{
vec2 frag = (vary_fragcoord.xy*0.5+0.5)*screen_res;
vec3 pos = getPosition(frag.xy).xyz;
if (pos.z < far_z)
{
discard;
}
vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
norm = normalize(norm);
vec4 spec = texture2DRect(specularRect, frag.xy);
vec3 diff = texture2DRect(diffuseRect, frag.xy).rgb;
float noise = texture2D(noiseMap, frag.xy/128.0).b;
vec3 out_col = vec3(0,0,0);
vec3 npos = normalize(-pos);
// As of OSX 10.6.7 ATI Apple's crash when using a variable size loop
for (int i = 0; i < MAX_LIGHT_COUNT; ++i)
{
bool light_contrib = (i < light_count);
vec3 lv = light[i].xyz-pos;
float dist2 = dot(lv,lv);
dist2 /= light[i].w;
if (dist2 > 1.0)
{
light_contrib = false;
}
float da = dot(norm, lv);
if (da < 0.0)
{
light_contrib = false;
}
if (light_contrib)
{
lv = normalize(lv);
da = dot(norm, lv);
float fa = light_col[i].a+1.0;
float dist_atten = clamp(1.0-(dist2-1.0*(1.0-fa))/fa, 0.0, 1.0);
dist_atten *= noise;
float lit = da * dist_atten;
vec3 col = light_col[i].rgb*lit*diff;
//vec3 col = vec3(dist2, light_col[i].a, lit);
if (spec.a > 0.0)
{
//vec3 ref = dot(pos+lv, norm);
float sa = dot(normalize(lv+npos),norm);
if (sa > 0.0)
{
sa = 6 * texture2D(lightFunc, vec2(sa, spec.a)).r * min(dist_atten*4.0, 1.0);
sa *= noise;
col += da*sa*light_col[i].rgb*spec.rgb;
}
}
out_col += col;
}
}
if (dot(out_col, out_col) <= 0.0)
{
discard;
}
frag_color.rgb = out_col;
frag_color.a = 0.0;
}
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