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/**
* @file class3\deferred\pointLightF.glsl
*
* $LicenseInfo:firstyear=2022&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2022, 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
/*[EXTRA_CODE_HERE]*/
#define DEBUG_ANY_LIGHT_TYPE 0 // Output magenta light cone
#define DEBUG_LEG_LIGHT_TYPE 0 // Show Legacy objects in green
#define DEBUG_PBR_LIGHT_TYPE 0 // Show PBR objects in blue
#define DEBUG_POINT_ZERO 0 // Output zero for point light
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_color;
#else
#define frag_color gl_FragColor
#endif
uniform sampler2DRect diffuseRect;
uniform sampler2DRect specularRect;
uniform sampler2DRect normalMap;
uniform sampler2DRect emissiveRect; // PBR linear packed Occlusion, Roughness, Metal. See: pbropaqueF.glsl
uniform sampler2D noiseMap;
uniform sampler2D lightFunc;
uniform sampler2DRect depthMap;
uniform vec3 env_mat[3];
uniform float sun_wash;
// light params
uniform vec3 color;
uniform float falloff;
uniform float size;
VARYING vec4 vary_fragcoord;
VARYING vec3 trans_center;
uniform vec2 screen_res;
uniform mat4 inv_proj;
uniform vec4 viewport;
vec3 BRDFLambertian( vec3 reflect0, vec3 reflect90, vec3 c_diff, float specWeight, float vh );
vec3 BRDFSpecularGGX( vec3 reflect0, vec3 reflect90, float alphaRoughness, float specWeight, float vh, float nl, float nv, float nh );
void calcHalfVectors(vec3 lv, vec3 n, vec3 v, out vec3 h, out vec3 l, out float nh, out float nl, out float nv, out float vh, out float lightDist);
vec3 getLightIntensityPoint(vec3 lightColor, float lightRange, float lightDistance);
vec4 getNormalEnvIntensityFlags(vec2 screenpos, out vec3 n, out float envIntensity);
vec4 getPosition(vec2 pos_screen);
vec2 getScreenXY(vec4 clip);
void initMaterial( vec3 diffuse, vec3 packedORM, out float alphaRough, out vec3 c_diff, out vec3 reflect0, out vec3 reflect90, out float specWeight );
vec3 srgb_to_linear(vec3 c);
void main()
{
vec3 final_color = vec3(0);
vec2 tc = getScreenXY(vary_fragcoord);
vec3 pos = getPosition(tc).xyz;
float envIntensity;
vec3 n;
vec4 norm = getNormalEnvIntensityFlags(tc, n, envIntensity); // need `norm.w` for GET_GBUFFER_FLAG()
vec3 diffuse = texture2DRect(diffuseRect, tc).rgb;
vec4 spec = texture2DRect(specularRect, tc);
// Common half vectors calcs
vec3 lv = trans_center.xyz-pos;
vec3 h, l, v = -normalize(pos);
float nh, nl, nv, vh, lightDist;
calcHalfVectors(lv, n, v, h, l, nh, nl, nv, vh, lightDist);
float dist = lightDist / size;
float dist_atten = 1.0 - (dist + falloff)/(1.0 + falloff);
dist_atten *= dist_atten;
dist_atten *= 2.0;
if (GET_GBUFFER_FLAG(GBUFFER_FLAG_HAS_PBR))
{
vec3 colorDiffuse = vec3(0);
vec3 colorSpec = vec3(0);
vec3 colorEmissive = spec.rgb; // PBR sRGB Emissive. See: pbropaqueF.glsl
vec3 packedORM = texture2DRect(emissiveRect, tc).rgb; // PBR linear packed Occlusion, Roughness, Metal. See: pbropaqueF.glsl
vec3 c_diff, reflect0, reflect90;
float alphaRough, specWeight;
initMaterial( diffuse, packedORM, alphaRough, c_diff, reflect0, reflect90, specWeight );
if (nl > 0.0)
{
vec3 intensity = dist_atten * getLightIntensityPoint(color, size, lightDist);
colorDiffuse += intensity * nl * BRDFLambertian (reflect0, reflect90, c_diff , specWeight, vh);
colorSpec += intensity * nl * BRDFSpecularGGX(reflect0, reflect90, alphaRough, specWeight, vh, nl, nv, nh);
}
#if DEBUG_PBR_LIGHT_TYPE
colorDiffuse = vec3(0,0,0.5); colorSpec = vec3(0);
#endif
final_color = colorDiffuse + colorSpec;
}
else
{
float dist = lightDist;
if (dist >= size)
{
discard;
}
dist /= size;
if (nl < 0.0)
{
discard;
}
float noise = texture2D(noiseMap, tc/128.0).b;
float lit = nl * dist_atten * noise;
final_color = color.rgb*lit*diffuse;
if (spec.a > 0.0)
{
lit = min(nl*6.0, 1.0) * dist_atten;
float sa = nh;
float fres = pow(1 - vh, 5) * 0.4+0.5;
float gtdenom = 2 * nh;
float gt = max(0,(min(gtdenom * nv / vh, gtdenom * nl / vh)));
if (nh > 0.0)
{
float scol = fres*texture2D(lightFunc, vec2(nh, spec.a)).r*gt/(nh*nl);
final_color += lit*scol*color.rgb*spec.rgb;
}
}
if (dot(final_color, final_color) <= 0.0)
{
discard;
}
#if DEBUG_LEG_LIGHT_TYPE
final_color.rgb = vec3(0,0.25,0);
#endif
}
#if DEBUG_POINT_ZERO
final_color = vec3(0);
#endif
#if DEBUG_ANY_LIGHT_TYPE
final_color = vec3(0.25,0,0.25);
#endif
frag_color.rgb = final_color;
frag_color.a = 0.0;
}
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