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+/**
+ * @file spotLightF.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
+#extension GL_ARB_shader_texture_lod : enable
+
+/*[EXTRA_CODE_HERE]*/
+
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+uniform sampler2DRect diffuseRect;
+uniform sampler2DRect specularRect;
+uniform sampler2DRect depthMap;
+uniform sampler2DRect normalMap;
+uniform samplerCube environmentMap;
+uniform sampler2DRect lightMap;
+uniform sampler2D noiseMap;
+uniform sampler2D projectionMap;
+uniform sampler2D lightFunc;
+
+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;
+
+uniform float size;
+uniform vec3 color;
+uniform float falloff;
+
+VARYING vec3 trans_center;
+VARYING vec4 vary_fragcoord;
+uniform vec2 screen_res;
+
+uniform mat4 inv_proj;
+
+vec3 getNorm(vec2 pos_screen);
+
+vec4 texture2DLodSpecular(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);
+
+ d *= min(1, d * (proj_lod - lod));
+
+ float edge = 0.25*det;
+
+ ret *= clamp(d/edge, 0.0, 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(vec2 pos_screen);
+
+void main()
+{
+ vec4 frag = vary_fragcoord;
+ frag.xyz /= frag.w;
+ frag.xyz = frag.xyz*0.5+0.5;
+ frag.xy *= screen_res;
+
+ vec3 pos = getPosition(frag.xy).xyz;
+ vec3 lv = trans_center.xyz-pos.xyz;
+ float dist = length(lv);
+ dist /= size;
+ if (dist > 1.0)
+ {
+ discard;
+ }
+
+ float shadow = 1.0;
+
+ if (proj_shadow_idx >= 0)
+ {
+ vec4 shd = texture2DRect(lightMap, frag.xy);
+ shadow = (proj_shadow_idx == 0) ? shd.b : shd.a;
+ shadow += shadow_fade;
+ shadow = clamp(shadow, 0.0, 1.0);
+ }
+
+ vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
+ float envIntensity = norm.z;
+ norm = getNorm(frag.xy);
+
+ 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)
+ {
+ discard;
+ }
+
+ proj_tc.xyz /= proj_tc.w;
+
+ float fa = (falloff*0.5) + 1.0;
+ float dist_atten = min(1.0 - (dist - 1.0 * (1.0 - fa)) / fa, 1.0);
+ dist_atten *= dist_atten;
+ dist_atten *= 2.0;
+
+ if (dist_atten <= 0.0)
+ {
+ discard;
+ }
+
+ lv = proj_origin-pos.xyz;
+ lv = normalize(lv);
+ float da = dot(norm, lv);
+
+ vec3 col = vec3(0,0,0);
+
+ vec3 diff_tex = srgb_to_linear(texture2DRect(diffuseRect, frag.xy).rgb);
+
+ vec4 spec = texture2DRect(specularRect, frag.xy);
+
+ vec3 dlit = vec3(0, 0, 0);
+
+ 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 amb_da = proj_ambiance;
+ float lit = 0.0;
+
+ if (da > 0.0)
+ {
+ lit = da * dist_atten * noise;
+
+ 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);
+
+ dlit = color.rgb * plcol.rgb * plcol.a;
+
+ col = dlit*lit*diff_tex*shadow;
+ amb_da += (da*0.5)*(1.0-shadow)*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)*(1.0-shadow)*proj_ambiance;
+
+ amb_da *= dist_atten * noise;
+
+ amb_da = min(amb_da, 1.0-lit);
+
+ col += amb_da*color.rgb*diff_tex.rgb*amb_plcol.rgb*amb_plcol.a;
+ }
+
+
+ if (spec.a > 0.0)
+ {
+ dlit *= min(da*6.0, 1.0) * dist_atten;
+ vec3 npos = -normalize(pos);
+
+ //vec3 ref = dot(pos+lv, norm);
+ vec3 h = normalize(lv+npos);
+ float nh = dot(norm, h);
+ float nv = dot(norm, npos);
+ float vh = dot(npos, h);
+ float sa = nh;
+ float fres = pow(1 - dot(h, npos), 5)*0.4+0.5;
+
+ float gtdenom = 2 * nh;
+ float gt = max(0, min(gtdenom * nv / vh, gtdenom * da / vh));
+
+ if (nh > 0.0)
+ {
+ float scol = fres*texture2D(lightFunc, vec2(nh, spec.a)).r*gt/(nh*da);
+ col += dlit*scol*spec.rgb*shadow;
+ }
+ }
+
+
+ if (envIntensity > 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 /= stc.w;
+
+ if (stc.x < 1.0 &&
+ stc.y < 1.0 &&
+ stc.x > 0.0 &&
+ stc.y > 0.0)
+ {
+ col += color.rgb * texture2DLodSpecular(projectionMap, stc.xy, (1 - spec.a) * (proj_lod * 0.6)).rgb * shadow * envIntensity;
+ }
+ }
+ }
+ }
+
+ //not sure why, but this line prevents MATBUG-194
+ col = max(col, vec3(0.0));
+
+ frag_color.rgb = col;
+ frag_color.a = 0.0;
+}