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lighting_ssr.frag
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// Copyright Patricio Gonzalez Vivo, 2022 - http://patriciogonzalezvivo.com/
#ifdef GL_ES
precision mediump float;
#endif
uniform sampler2D u_scene;
uniform sampler2D u_sceneNormal;
uniform sampler2D u_scenePosition;
uniform sampler2D u_sceneBuffer0; // specular
uniform mat4 u_viewMatrix;
uniform mat4 u_projectionMatrix;
uniform mat4 u_inverseProjectionMatrix;
uniform vec3 u_camera;
uniform float u_cameraFarClip;
uniform float u_cameraNearClip;
uniform vec3 u_light;
uniform vec3 u_lightColor;
uniform float u_lightFalloff;
uniform float u_lightIntensity;
uniform float u_iblLuminance;
uniform samplerCube u_cubeMap;
uniform vec3 u_SH[9];
#ifdef LIGHT_SHADOWMAP
uniform sampler2D u_lightShadowMap;
uniform mat4 u_lightMatrix;
varying vec4 v_lightCoord;
#endif
uniform vec2 u_resolution;
uniform float u_time;
varying vec4 v_position;
#ifdef MODEL_VERTEX_COLOR
varying vec4 v_color;
#endif
#ifdef MODEL_VERTEX_NORMAL
varying vec3 v_normal;
#endif
#ifdef MODEL_VERTEX_TEXCOORD
varying vec2 v_texcoord;
#endif
#ifdef MODEL_VERTEX_TANGENT
varying vec4 v_tangent;
varying mat3 v_tangentToWorld;
#endif
#define SURFACE_POSITION v_position
#define CAMERA_POSITION u_camera
#define IBL_LUMINANCE u_iblLuminance
#define LIGHT_POSITION u_light
#define LIGHT_COLOR u_lightColor
#define LIGHT_FALLOFF u_lightFalloff
#define LIGHT_INTENSITY u_lightIntensity
#define LIGHT_COORD v_lightCoord
#include "lygia/math/saturate.glsl"
#include "lygia/math/powFast.glsl"
#include "lygia/color/space/linear2gamma.glsl"
#include "lygia/lighting/pbr.glsl"
#include "lygia/lighting/material/new.glsl"
#include "lygia/lighting/toShininess.glsl"
#define SSR_FRESNEL
#include "lygia/lighting/ssr.glsl"
float checkBoard(vec2 uv, vec2 _scale) {
uv = floor(fract(uv * _scale) * 2.0);
return min(1.0, uv.x + uv.y) - (uv.x * uv.y);
}
void main(void) {
vec4 color = vec4(0.0, 0.0, 0.0, 1.0);
vec2 pixel = 1.0/u_resolution;
vec2 st = gl_FragCoord.xy * pixel;
#if defined(POSTPROCESSING)
color = texture2D(u_scene, st);
vec3 n = texture2D(u_sceneNormal, st).xyz;
float mask = texture2D(u_sceneBuffer0, st).r;
float opacity = 1.0;
float dist = 1.0;
vec2 uv = ssr(u_scenePosition, u_sceneNormal, st, pixel, opacity, dist);
color.rgb = mix(color.rgb, texture2D(u_scene, uv).rgb, mask * saturate(1.0-dist));
#else
vec2 uv = st;
#if defined(MODEL_VERTEX_TEXCOORD)
uv = v_texcoord;
#endif
Material material = materialNew();
material.metallic = 0.;
material.roughness = 0.05;
#if defined(FLOOR) && defined(MODEL_VERTEX_TEXCOORD)
material.albedo.rgb = vec3(0.5) + checkBoard(v_texcoord, vec2(8.0)) * 0.5;
material.metallic = 0.8;
material.roughness = 0.5 + checkBoard(v_texcoord, vec2(8.0)) * 0.5;
#endif
#if defined(SCENE_BUFFER_0)
// SPECULAR BUFFER
vec3 L = normalize(LIGHT_POSITION - (SURFACE_POSITION).xyz);
vec3 N = normalize(material.normal);
vec3 V = normalize(CAMERA_POSITION - (SURFACE_POSITION).xyz);
vec3 H = normalize(L + V);
float NoV = saturate(dot(N, V));
float NoL = saturate(dot(N, L));
float NoH = saturate(dot(N, H));
color.rgb += saturate(specularCookTorrance(L, N, V, NoV, NoL, NoH, material.roughness, vec3(0.0)));
float spec = saturate(.95 - material.roughness * 0.5);
color.rgb *= 1.0-saturate( (powFast(spec, 16.) * 0.8 + 1.6 * (1.0-material.metallic)) );
#else
// REGULAR PASS
color = pbr(material);
color = linear2gamma(color);
#endif
#endif
gl_FragColor = color;
}