grafika_komputerowa/grk/project/shaders/shader_9_1.frag
2024-01-29 16:10:54 +01:00

124 lines
3.2 KiB
GLSL

#version 430 core
float AMBIENT = 0.03;
float PI = 3.14;
uniform sampler2D depthMap;
uniform vec3 cameraPos;
uniform vec3 color;
uniform vec3 lightPositions[100];
uniform vec3 lightColors[100];
uniform vec3 spotlightPos;
uniform vec3 spotlightColor;
uniform vec3 spotlightConeDir;
uniform vec3 spotlightPhi;
uniform float metallic;
uniform float roughness;
uniform float exposition;
in vec3 vecNormal;
in vec3 worldPos;
out vec4 outColor;
in vec3 viewDirTS;
in vec3 lightDirTS[4];
in vec3 spotlightDirTS;
in vec3 sunDirTS;
in vec3 test;
float DistributionGGX(vec3 normal, vec3 H, float roughness){
float a = roughness*roughness;
float a2 = a*a;
float NdotH = max(dot(normal, H), 0.0);
float NdotH2 = NdotH*NdotH;
float num = a2;
float denom = (NdotH2 * (a2 - 1.0) + 1.0);
denom = PI * denom * denom;
return num / denom;
}
float GeometrySchlickGGX(float NdotV, float roughness){
float r = (roughness + 1.0);
float k = (r*r) / 8.0;
float num = NdotV;
float denom = NdotV * (1.0 - k) + k;
return num / denom;
}
float GeometrySmith(vec3 normal, vec3 V, vec3 lightDir, float roughness){
float NdotV = max(dot(normal, V), 0.0);
float NdotL = max(dot(normal, lightDir), 0.0);
float ggx2 = GeometrySchlickGGX(NdotV, roughness);
float ggx1 = GeometrySchlickGGX(NdotL, roughness);
return ggx1 * ggx2;
}
vec3 fresnelSchlick(float cosTheta, vec3 F0){
return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
}
vec3 PBRLight(vec3 lightDir, vec3 radiance, vec3 normal, vec3 V){
float diffuse=max(0,dot(normal,lightDir));
vec3 F0 = vec3(0.04);
F0 = mix(F0, color, metallic);
vec3 H = normalize(V + lightDir);
float NDF = DistributionGGX(normal, H, roughness);
float G = GeometrySmith(normal, V, lightDir, roughness);
vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
vec3 kS = F;
vec3 kD = vec3(1.0) - kS;
kD *= 1.0 - metallic;
vec3 numerator = NDF * G * F;
float denominator = 4.0 * max(dot(normal, V), 0.0) * max(dot(normal, lightDir), 0.0) + 0.0001;
vec3 specular = numerator / denominator;
float NdotL = max(dot(normal, lightDir), 0.0);
return (kD * color / PI + specular) * radiance * NdotL;
}
void main()
{
vec3 normal = normalize(vecNormal);
vec3 viewDir = normalize(cameraPos-worldPos);
vec3 lightDirs[4];
vec3 ambient = AMBIENT * color;
vec3 ilumination = ambient;
for (int i = 0; i < 100; ++i) {
lightDirs[i] = normalize(lightPositions[i] - worldPos);
vec3 attenuatedlightColor = lightColors[i] / pow(length(lightPositions[i] - worldPos), 2);
ilumination = ilumination+PBRLight(lightDirs[i], attenuatedlightColor * 300, normal, viewDir);
}
vec3 spotlightDir= normalize(spotlightPos-worldPos);
float angle_atenuation = clamp((dot(-normalize(spotlightPos-worldPos),spotlightConeDir)-0.5)*3,0,1);
vec3 attenuatedlightColor = angle_atenuation*spotlightColor/pow(length(spotlightPos-worldPos),2);
ilumination=ilumination+PBRLight(spotlightDir,attenuatedlightColor,normal,viewDir);
outColor = vec4(vec3(1.0) - exp(-ilumination*exposition),1);
}