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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
* $/LicenseInfo$
*/
/*[EXTRA_CODE_HERE]*/
out vec4 frag_color;
uniform sampler2D diffuseRect;
uniform sampler2D specularRect;
uniform sampler2D emissiveRect; // PBR linear packed Occlusion, Roughness, Metal. See: pbropaqueF.glsl
uniform sampler2D lightFunc;
uniform vec3 env_mat[3];
uniform float sun_wash;
// light params
uniform vec3 color;
uniform float falloff;
uniform float size;
in vec4 vary_fragcoord;
in vec3 trans_center;
uniform vec2 screen_res;
uniform mat4 inv_proj;
uniform vec4 viewport;
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);
float calcLegacyDistanceAttenuation(float distance, float falloff);
vec4 getNorm(vec2 screenpos);
vec4 getPosition(vec2 pos_screen);
vec2 getScreenXY(vec4 clip);
vec2 getScreenCoord(vec4 clip);
vec3 srgb_to_linear(vec3 c);
float getDepth(vec2 tc);
vec3 pbrPunctual(vec3 diffuseColor, vec3 specularColor,
float perceptualRoughness,
float metallic,
vec3 n, // normal
vec3 v, // surface point to camera
vec3 l); //surface point to light
void main()
{
vec3 final_color = vec3(0);
vec2 tc = getScreenCoord(vary_fragcoord);
vec3 pos = getPosition(tc).xyz;
vec4 norm = getNorm(tc); // need `norm.w` for GET_GBUFFER_FLAG()
vec3 n = norm.xyz;
vec3 diffuse = texture(diffuseRect, tc).rgb;
vec4 spec = texture(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);
if (lightDist >= size)
{
discard;
}
float dist = lightDist / size;
float dist_atten = calcLegacyDistanceAttenuation(dist, falloff);
if (GET_GBUFFER_FLAG(GBUFFER_FLAG_HAS_PBR))
{
vec3 colorEmissive = texture(emissiveRect, tc).rgb;
vec3 orm = spec.rgb;
float perceptualRoughness = orm.g;
float metallic = orm.b;
vec3 f0 = vec3(0.04);
vec3 baseColor = diffuse.rgb;
vec3 diffuseColor = baseColor.rgb*(vec3(1.0)-f0);
diffuseColor *= 1.0 - metallic;
vec3 specularColor = mix(f0, baseColor.rgb, metallic);
vec3 intensity = dist_atten * color * 3.25; // Legacy attenuation, magic number to balance with legacy materials
final_color += intensity*pbrPunctual(diffuseColor, specularColor, perceptualRoughness, metallic, n.xyz, v, normalize(lv));
}
else
{
if (nl < 0.0)
{
discard;
}
diffuse = srgb_to_linear(diffuse);
spec.rgb = srgb_to_linear(spec.rgb);
float lit = nl * dist_atten;
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*texture(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;
}
}
frag_color.rgb = max(final_color, vec3(0));
frag_color.a = 0.0;
}
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