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/**
* @file multiSpotLightF.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
* $/LicenseInfo$
*/
//class 1 -- no shadows
#extension GL_ARB_texture_rectangle : enable
#extension GL_ARB_texture_multisample : enable
uniform sampler2DMS diffuseRect;
uniform sampler2DMS specularRect;
uniform sampler2DMS depthMap;
uniform sampler2DMS normalMap;
uniform sampler2D noiseMap;
uniform sampler2D lightFunc;
uniform sampler2D projectionMap;
uniform mat4 proj_mat; //screen space to light space
uniform float proj_near; //near clip for projection
uniform vec3 proj_p; //plane projection is emitting from (in screen space)
uniform vec3 proj_n;
uniform float proj_focus; //distance from plane to begin blurring
uniform float proj_lod; //(number of mips in proj map)
uniform float proj_range; //range between near clip and far clip plane of projection
uniform float proj_ambient_lod;
uniform float proj_ambiance;
uniform float near_clip;
uniform float far_clip;
uniform vec3 proj_origin; //origin of projection to be used for angular attenuation
uniform float sun_wash;
uniform int proj_shadow_idx;
uniform float shadow_fade;
varying vec4 vary_light;
varying vec4 vary_fragcoord;
uniform vec2 screen_res;
uniform mat4 inv_proj;
vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
{
vec4 ret = texture2DLod(projectionMap, tc, lod);
vec2 dist = tc-vec2(0.5);
float det = max(1.0-lod/(proj_lod*0.5), 0.0);
float d = dot(dist,dist);
ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0)+det, 1.0);
return ret;
}
vec4 texture2DLodDiffuse(sampler2D projectionMap, vec2 tc, float lod)
{
vec4 ret = texture2DLod(projectionMap, tc, lod);
vec2 dist = vec2(0.5) - abs(tc-vec2(0.5));
float det = min(lod/(proj_lod*0.5), 1.0);
float d = min(dist.x, dist.y);
float edge = 0.25*det;
ret *= clamp(d/edge, 0.0, 1.0);
return ret;
}
vec4 texture2DLodAmbient(sampler2D projectionMap, vec2 tc, float lod)
{
vec4 ret = texture2DLod(projectionMap, tc, lod);
vec2 dist = tc-vec2(0.5);
float d = dot(dist,dist);
ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0), 1.0);
return ret;
}
vec4 getPosition(ivec2 pos_screen, int sample)
{
float depth = texelFetch(depthMap, pos_screen, sample).r;
vec2 sc = vec2(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()
{
vec4 frag = vary_fragcoord;
frag.xyz /= frag.w;
frag.xyz = frag.xyz*0.5+0.5;
frag.xy *= screen_res;
ivec2 itc = ivec2(frag.xy);
vec3 fcol = vec3(0,0,0);
int wght = 0;
for (int i = 0; i < samples; ++i)
{
vec3 pos = getPosition(itc, i).xyz;
vec3 lv = vary_light.xyz-pos.xyz;
float dist2 = dot(lv,lv);
dist2 /= vary_light.w;
if (dist2 <= 1.0)
{
vec3 norm = texelFetch(normalMap, itc, i).xyz*2.0-1.0;
norm = normalize(norm);
float l_dist = -dot(lv, proj_n);
vec4 proj_tc = (proj_mat * vec4(pos.xyz, 1.0));
if (proj_tc.z >= 0.0)
{
proj_tc.xyz /= proj_tc.w;
float fa = gl_Color.a+1.0;
float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
if (dist_atten > 0.0)
{
lv = proj_origin-pos.xyz;
lv = normalize(lv);
float da = dot(norm, lv);
vec3 col = vec3(0,0,0);
vec3 diff_tex = texelFetch(diffuseRect, itc, i).rgb;
float noise = texture2D(noiseMap, frag.xy/128.0).b;
if (proj_tc.z > 0.0 &&
proj_tc.x < 1.0 &&
proj_tc.y < 1.0 &&
proj_tc.x > 0.0 &&
proj_tc.y > 0.0)
{
float lit = 0.0;
float amb_da = proj_ambiance;
if (da > 0.0)
{
float diff = clamp((l_dist-proj_focus)/proj_range, 0.0, 1.0);
float lod = diff * proj_lod;
vec4 plcol = texture2DLodDiffuse(projectionMap, proj_tc.xy, lod);
vec3 lcol = gl_Color.rgb * plcol.rgb * plcol.a;
lit = da * dist_atten * noise;
col = lcol*lit*diff_tex;
amb_da += (da*0.5)*proj_ambiance;
}
//float diff = clamp((proj_range-proj_focus)/proj_range, 0.0, 1.0);
vec4 amb_plcol = texture2DLodAmbient(projectionMap, proj_tc.xy, proj_lod);
amb_da += (da*da*0.5+0.5)*proj_ambiance;
amb_da *= dist_atten * noise;
amb_da = min(amb_da, 1.0-lit);
col += amb_da*gl_Color.rgb*diff_tex.rgb*amb_plcol.rgb*amb_plcol.a;
}
vec4 spec = texelFetch(specularRect, itc, i);
if (spec.a > 0.0)
{
vec3 ref = reflect(normalize(pos), norm);
//project from point pos in direction ref to plane proj_p, proj_n
vec3 pdelta = proj_p-pos;
float ds = dot(ref, proj_n);
if (ds < 0.0)
{
vec3 pfinal = pos + ref * dot(pdelta, proj_n)/ds;
vec4 stc = (proj_mat * vec4(pfinal.xyz, 1.0));
if (stc.z > 0.0)
{
stc.xy /= stc.w;
float fatten = clamp(spec.a*spec.a+spec.a*0.5, 0.25, 1.0);
stc.xy = (stc.xy - vec2(0.5)) * fatten + vec2(0.5);
if (stc.x < 1.0 &&
stc.y < 1.0 &&
stc.x > 0.0 &&
stc.y > 0.0)
{
vec4 scol = texture2DLodSpecular(projectionMap, stc.xy, proj_lod-spec.a*proj_lod);
col += dist_atten*scol.rgb*gl_Color.rgb*scol.a*spec.rgb;
}
}
}
}
fcol += col;
++wght;
}
}
}
}
if (wght <= 0)
{
discard;
}
gl_FragColor.rgb = fcol/samples;
gl_FragColor.a = 0.0;
}
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