198 lines
5.9 KiB
GLSL
198 lines
5.9 KiB
GLSL
#version 450
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#ifdef GL_ES
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precision mediump float;
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#endif
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#define PI 3.1415926535
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#define TwoPI (2.0 * PI)
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uniform sampler2D gbuffer0;
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uniform sampler2D gbuffer1;
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uniform sampler2D gbuffer2;
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uniform sampler2D ssaotex;
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uniform sampler2D shadowMap;
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uniform sampler2D senvmapRadiance;
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uniform sampler2D senvmapIrradiance;
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uniform sampler2D senvmapBrdf;
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uniform mat4 LMVP;
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uniform vec3 light;
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uniform vec3 eye;
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in vec2 texCoord;
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vec2 envMapEquirect(vec3 normal) {
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float phi = acos(normal.z);
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float theta = atan(-normal.y, normal.x) + PI;
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return vec2(theta / TwoPI, phi / PI);
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}
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float getMipLevelFromRoughness(float roughness) {
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// First mipmap level = roughness 0, last = roughness = 1
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// 6 mipmaps + base
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return roughness * 7.0;
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}
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vec3 surfaceAlbedo(vec3 baseColor, float metalness) {
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return mix(baseColor, vec3(0.0), metalness);
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}
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vec3 surfaceF0(vec3 baseColor, float metalness) {
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return mix(vec3(0.04), baseColor, metalness);
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}
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vec3 f_schlick(vec3 f0, float vh) {
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return f0 + (1.0-f0)*exp2((-5.55473 * vh - 6.98316)*vh);
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}
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float v_smithschlick(float nl, float nv, float a) {
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return 1.0 / ( (nl*(1.0-a)+a) * (nv*(1.0-a)+a) );
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}
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float d_ggx(float nh, float a) {
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float a2 = a*a;
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float denom = pow(nh*nh * (a2-1.0) + 1.0, 2.0);
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return a2 * (1.0 / 3.1415926535) / denom;
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}
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vec3 specularBRDF(vec3 f0, float roughness, float nl, float nh, float nv, float vh, float lh) {
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float a = roughness * roughness;
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return d_ggx(nh, a) * clamp(v_smithschlick(nl, nv, a), 0.0, 1.0) * f_schlick(f0, vh) / 4.0;
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//return vec3(LightingFuncGGX_OPT3(nl, lh, nh, roughness, f0[0]));
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}
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vec3 lambert(vec3 albedo, float nl) {
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return albedo * max(0.0, nl);
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}
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vec3 diffuseBRDF(vec3 albedo, float roughness, float nv, float nl, float vh, float lv) {
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return lambert(albedo, nl);
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}
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float texture2DCompare(vec2 uv, float compare){
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float depth = texture(shadowMap, uv).r * 2.0 - 1.0;
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return step(compare, depth);
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}
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float texture2DShadowLerp(vec2 size, vec2 uv, float compare){
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vec2 texelSize = vec2(1.0) / size;
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vec2 f = fract(uv * size + 0.5);
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vec2 centroidUV = floor(uv * size + 0.5) / size;
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float lb = texture2DCompare(centroidUV + texelSize * vec2(0.0, 0.0), compare);
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float lt = texture2DCompare(centroidUV + texelSize * vec2(0.0, 1.0), compare);
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float rb = texture2DCompare(centroidUV + texelSize * vec2(1.0, 0.0), compare);
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float rt = texture2DCompare(centroidUV + texelSize * vec2(1.0, 1.0), compare);
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float a = mix(lb, lt, f.y);
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float b = mix(rb, rt, f.y);
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float c = mix(a, b, f.x);
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return c;
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}
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float PCF(vec2 size, vec2 uv, float compare){
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float result = 0.0;
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// for (int x = -1; x <= 1; x++){
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// for(int y = -1; y <= 1; y++){
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// vec2 off = vec2(x, y) / size;
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// result += texture2DShadowLerp(size, uv + off, compare);
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vec2 off = vec2(-1, -1) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(-1, 0) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(-1, 1) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(0, -1) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(0, 0) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(0, 1) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(1, -1) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(1, 0) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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off = vec2(1, 1) / size;
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result += texture2DShadowLerp(size, uv + off, compare);
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// }
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// }
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return result / 9.0;
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}
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float shadowTest(vec4 lPos) {
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vec4 lPosH = lPos / lPos.w;
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lPosH.x = (lPosH.x + 1.0) / 2.0;
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lPosH.y = 1.0 - ((-lPosH.y + 1.0) / (2.0));
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return PCF(vec2(2048, 2048), lPosH.st, lPosH.z - 0.005);
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}
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void main() {
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vec4 g0 = texture(gbuffer0, texCoord); // Normals, depth
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float depth = g0.a;
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if (depth >= 1.0) discard;
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vec4 g1 = texture(gbuffer1, texCoord); // Positions, roughness
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vec4 g2 = texture(gbuffer2, texCoord); // Base color, metalness
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float ao = texture(ssaotex, texCoord).r; // Normals, depth
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vec3 n = g0.rgb * 2.0 - 1.0;
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vec3 p = g1.rgb * 2.0 - 1.0;
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//n = normalize(n);
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vec3 baseColor = g2.rgb;
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float roughness = g1.a;
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float metalness = g2.a;
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// float occlusion = g2.a;
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vec3 lightDir = light - p.xyz;
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vec3 eyeDir = eye - p.xyz;
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vec3 l = normalize(lightDir);
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vec3 v = normalize(eyeDir);
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vec3 h = normalize(v + l);
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float dotNL = max(dot(n, l), 0.0);
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float dotNV = max(dot(n, v), 0.0);
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float dotNH = max(dot(n, h), 0.0);
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float dotVH = max(dot(v, h), 0.0);
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float dotLV = max(dot(l, v), 0.0);
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float dotLH = max(dot(l, h), 0.0);
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vec3 albedo = surfaceAlbedo(baseColor, metalness);
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vec3 f0 = surfaceF0(baseColor, metalness);
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vec4 lPos = LMVP * vec4(vec3(p), 1.0);
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float visibility = 1.0;
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if (lPos.w > 0.0) {
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visibility = shadowTest(lPos);
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// visibility = 1.0;
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}
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// Direct
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vec3 direct = diffuseBRDF(albedo, roughness, dotNV, dotNL, dotVH, dotLV) + specularBRDF(f0, roughness, dotNL, dotNH, dotNV, dotVH, dotLH);
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// Indirect
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vec3 indirectDiffuse = texture(senvmapIrradiance, envMapEquirect(n)).rgb;
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indirectDiffuse = pow(indirectDiffuse, vec3(2.2)) * albedo;
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vec3 reflectionWorld = reflect(-v, n);
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float lod = getMipLevelFromRoughness(roughness);// + 1.0;
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vec3 prefilteredColor = textureLod(senvmapRadiance, envMapEquirect(reflectionWorld), lod).rgb;
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prefilteredColor = pow(prefilteredColor, vec3(2.2));
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vec2 envBRDF = texture(senvmapBrdf, vec2(roughness, 1.0 - dotNV)).xy;
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vec3 indirectSpecular = prefilteredColor * (f0 * envBRDF.x + envBRDF.y);
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vec3 indirect = indirectDiffuse + indirectSpecular;
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vec4 outColor = vec4(vec3(direct * visibility + indirect), 1.0);
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// outColor.rgb *= occlusion;
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outColor.rgb *= ao;
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gl_FragColor = vec4(pow(outColor.rgb, vec3(1.0 / 2.2)), outColor.a);
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}
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