/**
* @file class3\deferred\spotLightF.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 depthMap;
uniform sampler2D normalMap;
uniform sampler2D emissiveRect; // PBR linear packed Occlusion, Roughness, Metal. See: pbropaqueF.glsl
uniform samplerCube environmentMap;
uniform sampler2D lightMap;
uniform sampler2D projectionMap; // rgba
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;
// Light params
#if defined(MULTI_SPOTLIGHT)
uniform vec3 center;
#else
in vec3 trans_center;
#endif
uniform float size;
uniform vec3 color;
uniform float falloff;
in vec4 vary_fragcoord;
uniform vec2 screen_res;
uniform mat4 inv_proj;
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);
bool clipProjectedLightVars(vec3 center, vec3 pos, out float dist, out float l_dist, out vec3 lv, out vec4 proj_tc );
vec4 getNorm(vec2 screenpos);
vec3 getProjectedLightAmbiance(float amb_da, float attenuation, float lit, float nl, float noise, vec2 projected_uv);
vec3 getProjectedLightDiffuseColor(float light_distance, vec2 projected_uv );
vec2 getScreenCoord(vec4 clip);
vec3 srgb_to_linear(vec3 cs);
vec4 texture2DLodSpecular(vec2 tc, float lod);
vec4 getPosition(vec2 pos_screen);
const float M_PI = 3.14159265;
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(0,0,0);
vec2 tc = getScreenCoord(vary_fragcoord);
vec3 pos = getPosition(tc).xyz;
vec3 lv;
vec4 proj_tc;
float dist, l_dist;
vec3 c;
#if defined(MULTI_SPOTLIGHT)
c = center;
#else
c = trans_center;
#endif
if (clipProjectedLightVars(c, pos, dist, l_dist, lv, proj_tc))
{
discard;
}
float shadow = 1.0;
if (proj_shadow_idx >= 0)
{
vec4 shd = texture(lightMap, tc);
shadow = (proj_shadow_idx==0)?shd.b:shd.a;
shadow += shadow_fade;
shadow = clamp(shadow, 0.0, 1.0);
}
vec4 norm = getNorm(tc);
vec3 n = norm.xyz;
float dist_atten = calcLegacyDistanceAttenuation(dist, falloff);
if (dist_atten <= 0.0)
{
discard;
}
lv = proj_origin-pos.xyz;
vec3 h, l, v = -normalize(pos);
float nh, nl, nv, vh, lightDist;
calcHalfVectors(lv, n, v, h, l, nh, nl, nv, vh, lightDist);
vec3 diffuse = texture(diffuseRect, tc).rgb;
vec4 spec = texture(specularRect, tc);
vec3 dlit = vec3(0, 0, 0);
vec3 slit = vec3(0, 0, 0);
vec3 amb_rgb = vec3(0);
if (GET_GBUFFER_FLAG(GBUFFER_FLAG_HAS_PBR))
{
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);
// We need this additional test inside a light's frustum since a spotlight's ambiance can be applied
if (proj_tc.x > 0.0 && proj_tc.x < 1.0
&& proj_tc.y > 0.0 && proj_tc.y < 1.0)
{
float lit = 0.0;
float amb_da = 0.0;
lv = normalize(lv);
if (nl > 0.0)
{
amb_da += (nl*0.5 + 0.5) * proj_ambiance;
dlit = getProjectedLightDiffuseColor( l_dist, proj_tc.xy );
vec3 intensity = dist_atten * dlit * 3.25 * shadow; // Legacy attenuation, magic number to balance with legacy materials
final_color += intensity*pbrPunctual(diffuseColor, specularColor, perceptualRoughness, metallic, n.xyz, v, lv);
}
amb_rgb = getProjectedLightAmbiance( amb_da, dist_atten, lit, nl, 1.0, proj_tc.xy ) * 3.25; //magic number to balance with legacy ambiance
final_color += amb_rgb * pbrPunctual(diffuseColor, specularColor, perceptualRoughness, metallic, n.xyz, v, -lv);
}
}
else
{
float envIntensity = texture(emissiveRect, tc).r;
diffuse = srgb_to_linear(diffuse);
spec.rgb = srgb_to_linear(spec.rgb);
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 = 0;
float lit = 0.0;
if (nl > 0.0)
{
lit = nl * dist_atten;
dlit = getProjectedLightDiffuseColor( l_dist, proj_tc.xy );
final_color = dlit*lit*diffuse*shadow;
// unshadowed for consistency between forward and deferred?
amb_da += (nl*0.5+0.5) /* * (1.0-shadow) */ * proj_ambiance;
}
amb_rgb = getProjectedLightAmbiance( amb_da, dist_atten, lit, nl, 1.0, proj_tc.xy );
final_color += diffuse.rgb * amb_rgb * max(dot(-normalize(lv), n), 0.0);
}
if (spec.a > 0.0)
{
dlit *= min(nl*6.0, 1.0) * dist_atten;
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);
vec3 speccol = dlit*scol*spec.rgb*shadow;
speccol = clamp(speccol, vec3(0), vec3(1));
final_color += speccol;
}
}
if (envIntensity > 0.0)
{
vec3 ref = reflect(normalize(pos), n);
//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)
{
final_color += color.rgb * texture2DLodSpecular(stc.xy, (1 - spec.a) * (proj_lod * 0.6)).rgb * shadow * envIntensity;
}
}
}
}
}
//not sure why, but this line prevents MATBUG-194
final_color = max(final_color, vec3(0.0));
//output linear
frag_color.rgb = final_color;
frag_color.a = 0.0;
}