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/**
* @file class1\deferred\pbralphaF.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]*/
uniform sampler2D diffuseMap; //always in sRGB space
uniform sampler2D bumpMap;
uniform sampler2D emissiveMap;
uniform sampler2D specularMap; // PBR: Packed: Occlusion, Metal, Roughness
uniform float metallicFactor;
uniform float roughnessFactor;
uniform vec3 emissiveColor;
#if defined(HAS_SUN_SHADOW) || defined(HAS_SSAO)
uniform sampler2DRect lightMap;
#endif
uniform int sun_up_factor;
uniform vec3 sun_dir;
uniform vec3 moon_dir;
out vec4 frag_color;
#ifdef HAS_SHADOW
VARYING vec3 vary_fragcoord;
uniform vec2 screen_res;
#endif
VARYING vec3 vary_position;
VARYING vec4 vertex_color;
VARYING vec2 vary_texcoord0;
VARYING vec2 vary_texcoord1;
VARYING vec2 vary_texcoord2;
VARYING vec3 vary_normal;
VARYING vec3 vary_tangent;
flat in float vary_sign;
#ifdef HAS_ALPHA_MASK
uniform float minimum_alpha; // PBR alphaMode: MASK, See: mAlphaCutoff, setAlphaCutoff()
#endif
// Lights
// See: LLRender::syncLightState()
uniform vec4 light_position[8];
uniform vec3 light_direction[8]; // spot direction
uniform vec4 light_attenuation[8]; // linear, quadratic, is omni, unused, See: LLPipeline::setupHWLights() and syncLightState()
uniform vec3 light_diffuse[8];
uniform vec2 light_deferred_attenuation[8]; // light size and falloff
vec3 srgb_to_linear(vec3 c);
vec3 linear_to_srgb(vec3 c);
void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 norm, vec3 light_dir, out vec3 sunlit, out vec3 amblit, out vec3 atten, out vec3 additive);
vec3 atmosFragLightingLinear(vec3 light, vec3 additive, vec3 atten);
vec3 scaleSoftClipFragLinear(vec3 l);
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);
float sampleDirectionalShadow(vec3 pos, vec3 norm, vec2 pos_screen);
void sampleReflectionProbes(inout vec3 ambenv, inout vec3 glossenv,
vec3 pos, vec3 norm, float glossiness);
// PBR interface
vec3 pbrIbl(vec3 diffuseColor,
vec3 specularColor,
vec3 radiance, // radiance map sample
vec3 irradiance, // irradiance map sample
float ao, // ambient occlusion factor
float nv, // normal dot view vector
float perceptualRoughness);
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
vec3 calcPointLightOrSpotLight(vec3 diffuseColor, vec3 specularColor,
float perceptualRoughness,
float metallic,
vec3 n, // normal
vec3 p, // pixel position
vec3 v, // view vector (negative normalized pixel position)
vec3 lp, // light position
vec3 ld, // light direction (for spotlights)
vec3 lightColor,
float lightSize, float falloff, float is_pointlight, float ambiance)
{
vec3 color = vec3(0,0,0);
vec3 lv = lp.xyz - p;
float lightDist = length(lv);
float dist = lightDist / lightSize;
if (dist <= 1.0)
{
lv /= lightDist;
float dist_atten = calcLegacyDistanceAttenuation(dist, falloff);
vec3 intensity = dist_atten * lightColor * 3.0;
color = intensity*pbrPunctual(diffuseColor, specularColor, perceptualRoughness, metallic, n.xyz, v, lv);
}
return color;
}
void main()
{
vec3 color = vec3(0,0,0);
vec3 light_dir = (sun_up_factor == 1) ? sun_dir : moon_dir;
vec3 pos = vary_position;
// IF .mFeatures.mIndexedTextureChannels = LLGLSLShader::sIndexedTextureChannels;
// vec3 col = vertex_color.rgb * diffuseLookup(vary_texcoord0.xy).rgb;
// else
vec4 albedo = texture(diffuseMap, vary_texcoord0.xy).rgba;
albedo.rgb = srgb_to_linear(albedo.rgb);
#ifdef HAS_ALPHA_MASK
if (albedo.a < minimum_alpha)
{
discard;
}
#endif
vec3 baseColor = vertex_color.rgb * albedo.rgb;
vec3 vNt = texture(bumpMap, vary_texcoord1.xy).xyz*2.0-1.0;
float sign = vary_sign;
vec3 vN = vary_normal;
vec3 vT = vary_tangent.xyz;
vec3 vB = sign * cross(vN, vT);
vec3 norm = normalize( vNt.x * vT + vNt.y * vB + vNt.z * vN );
norm *= gl_FrontFacing ? 1.0 : -1.0;
float scol = 1.0;
vec3 sunlit;
vec3 amblit;
vec3 additive;
vec3 atten;
calcAtmosphericVarsLinear(pos.xyz, norm, light_dir, sunlit, amblit, additive, atten);
#ifdef HAS_SHADOW
vec2 frag = vary_fragcoord.xy/vary_fragcoord.z*0.5+0.5;
frag *= screen_res;
scol = sampleDirectionalShadow(pos.xyz, norm.xyz, frag);
#endif
vec3 orm = texture(specularMap, vary_texcoord2.xy).rgb; //orm is packed into "emissiveRect" to keep the data in linear color space
float perceptualRoughness = orm.g * roughnessFactor;
float metallic = orm.b * metallicFactor;
float ao = orm.r;
// emissiveColor is the emissive color factor from GLTF and is already in linear space
vec3 colorEmissive = emissiveColor;
// emissiveMap here is a vanilla RGB texture encoded as sRGB, manually convert to linear
colorEmissive *= srgb_to_linear(texture2D(emissiveMap, vary_texcoord0.xy).rgb);
// PBR IBL
float gloss = 1.0 - perceptualRoughness;
vec3 irradiance = vec3(0);
vec3 radiance = vec3(0);
sampleReflectionProbes(irradiance, radiance, pos.xyz, norm.xyz, gloss);
irradiance = max(amblit*0.75,irradiance);
vec3 f0 = vec3(0.04);
vec3 diffuseColor = baseColor.rgb*(vec3(1.0)-f0);
diffuseColor *= 1.0 - metallic;
vec3 specularColor = mix(f0, baseColor.rgb, metallic);
vec3 v = -normalize(pos.xyz);
float NdotV = clamp(abs(dot(norm.xyz, v)), 0.001, 1.0);
color += pbrIbl(diffuseColor, specularColor, radiance, irradiance, ao, NdotV, perceptualRoughness);
color += pbrPunctual(diffuseColor, specularColor, perceptualRoughness, metallic, norm.xyz, v, light_dir) * sunlit * scol;
color += colorEmissive*0.5;
color = atmosFragLightingLinear(color, additive, atten);
color = scaleSoftClipFragLinear(color);
vec3 light = vec3(0);
// Punctual lights
#define LIGHT_LOOP(i) light += calcPointLightOrSpotLight(diffuseColor, specularColor, perceptualRoughness, metallic, norm.xyz, pos.xyz, v, light_position[i].xyz, light_direction[i].xyz, light_diffuse[i].rgb, light_deferred_attenuation[i].x, light_deferred_attenuation[i].y, light_attenuation[i].z, light_attenuation[i].w);
LIGHT_LOOP(1)
LIGHT_LOOP(2)
LIGHT_LOOP(3)
LIGHT_LOOP(4)
LIGHT_LOOP(5)
LIGHT_LOOP(6)
LIGHT_LOOP(7)
color.rgb += light.rgb;
frag_color = vec4(color.rgb,albedo.a * vertex_color.a);
}
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