256 lines
No EOL
7.9 KiB
GLSL
256 lines
No EOL
7.9 KiB
GLSL
#version 330 core
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const int MAX_LIGHTS = 32;
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const float PI = 3.14159265359;
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const float SPECULAR_POWER = 10;
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in vec4 outPos;
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in vec3 outNormal;
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in vec3 outTangent;
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in vec3 outBitangent;
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in vec2 outTextCoords;
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out vec4 fragColor;
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struct Attenuation
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{
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float constant;
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float linear;
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float exponent;
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};
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struct Light {
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vec3 position;
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int lightType;
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float intensity;
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vec3 color;
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vec3 conedir;
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float cutoff;
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Attenuation attenuation;
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};
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struct Material {
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vec4 diffuse;
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int hasTexture;
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int hasNormalMap;
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int hasRoughMap;
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float roughnessFactor;
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float metallicFactor;
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};
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uniform sampler2D textureSampler;
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uniform sampler2D normalSampler;
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uniform sampler2D roughnessSampler;
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uniform Light lights[MAX_LIGHTS];
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struct SceneInfo {
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vec3 camPos;
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float ambientLightIntensity;
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vec3 ambientLightColor;
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int LightCount;
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};
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uniform Material material;
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uniform SceneInfo sceneInfo;
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vec4 calcAmbient(Light ambientLight, vec4 ambient) {
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return vec4(ambientLight.intensity * ambientLight.color, 1) * ambient;
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}
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vec4 calcLightColor(vec4 diffuse, vec4 specular, vec3 lightColor, float light_intensity, vec3 position, vec3 to_light_dir, vec3 normal, float Metallic) {
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vec4 diffuseColor = vec4(0, 0, 0, 1);
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vec4 specColor = vec4(0, 0, 0, 1);
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float diffuseFactor = max(dot(normal, to_light_dir), 0.0);
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diffuseColor = diffuse * vec4(lightColor, 1.0) * light_intensity * diffuseFactor;
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vec3 camera_direction = normalize(-position);
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vec3 from_light_dir = -to_light_dir;
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vec3 reflected_light = normalize(reflect(from_light_dir, normal));
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float specularFactor = max(dot(camera_direction, reflected_light), 0.0);
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specularFactor = pow(specularFactor, SPECULAR_POWER);
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specColor = specular * light_intensity * specularFactor * Metallic * vec4(lightColor, 1.0);
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return (diffuseColor + specColor);
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}
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vec4 calcPointLight(vec4 diffuse, vec4 specular, Light light, vec3 position, vec3 normal, float Metallic) {
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vec3 light_direction = light.position - position;
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vec3 to_light_dir = normalize(light_direction);
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vec4 light_color = calcLightColor(diffuse, specular, light.color, light.intensity, position, to_light_dir, normal,Metallic);
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float distance = length(light_direction);
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float attenuationInv = light.attenuation.constant + light.attenuation.linear * distance +
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light.attenuation.exponent * distance * distance;
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return light_color / attenuationInv;
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}
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vec4 calcSpotLight(vec4 diffuse, vec4 specular, Light light, vec3 position, vec3 normal,float Metallic) {
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vec3 light_direction = light.position - position;
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vec3 to_light_dir = normalize(light_direction);
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vec3 from_light_dir = -to_light_dir;
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float spot_alfa = dot(from_light_dir, normalize(light.conedir));
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vec4 color = vec4(0, 0, 0, 0);
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if (spot_alfa > light.cutoff)
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{
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color = calcPointLight(diffuse, specular, light, position, normal,Metallic);
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color *= (1.0 - (1.0 - spot_alfa)/(1.0 - light.cutoff));
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}
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return color;
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}
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vec4 calcDirLight(vec4 diffuse, vec4 specular, Light light, vec3 position, vec3 normal,float Metallic) {
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return calcLightColor(diffuse, specular, light.color, light.intensity, position, normalize(light.position), normal,Metallic);
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}
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vec3 calcNormal(Material material, vec3 normal, vec2 textCoords, mat3 TBN)
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{
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vec3 newNormal = normal;
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if (material.hasNormalMap > 0)
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{
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newNormal = texture(normalSampler, textCoords).rgb;
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newNormal = normalize(newNormal * 2.0 - 1.0);
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newNormal = normalize(TBN * newNormal);
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}
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return newNormal;
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}
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float distributionGGX(vec3 N, vec3 H, float roughness) {
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float a = roughness * roughness;
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float a2 = a * a;
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float NdotH = max(dot(N, H), 0.0);
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float NdotH2 = NdotH * NdotH;
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float nom = a2;
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float denom = (NdotH2 * (a2 - 1.0) + 1.0);
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denom = PI * denom * denom;
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return nom / denom;
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}
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float geometrySchlickGGX(float NdotV, float roughness) {
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float r = (roughness + 1.0);
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float k = (r * r) / 8.0;
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float nom = NdotV;
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float denom = NdotV * (1.0 - k) + k;
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return nom / denom;
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}
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float geometrySmith(vec3 N, vec3 V, vec3 L, float roughness) {
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float NdotV = max(dot(N, V), 0.0);
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float NdotL = max(dot(N, L), 0.0);
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float ggx2 = geometrySchlickGGX(NdotV, roughness);
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float ggx1 = geometrySchlickGGX(NdotL, roughness);
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return ggx1 * ggx2;
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}
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vec3 fresnelSchlick(float cosTheta, vec3 F0) {
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return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
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}
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vec3 calculatePointLight(Light light, vec3 worldPos, vec3 V, vec3 N, vec3 F0, vec3 albedo, float metallic, float roughness) {
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vec3 tmpSub = light.position - worldPos;
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vec3 L = normalize(tmpSub);
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vec3 H = normalize(V + L);
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// Calculate distance and attenuation
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float distance = length(tmpSub);
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float attenuation = 1.0 / (distance * distance);
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float intensity = 10.0f;
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vec3 radiance = light.color * light.intensity * attenuation;
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// Cook-Torrance BRDF
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float NDF = distributionGGX(N, H, roughness);
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float G = geometrySmith(N, V, L, roughness);
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vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
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vec3 numerator = NDF * G * F;
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float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001;
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vec3 specular = numerator / denominator;
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vec3 kS = F;
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vec3 kD = vec3(1.0) - kS;
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kD *= 1.0 - metallic;
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float NdotL = max(dot(N, L), 0.0);
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return (kD * albedo / PI + specular) * radiance * NdotL;
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}
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vec3 calculateDirectionalLight(Light light, vec3 V, vec3 N, vec3 F0, vec3 albedo, float metallic, float roughness) {
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vec3 L = normalize(-light.position);
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vec3 H = normalize(V + L);
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vec3 radiance = light.color * light.intensity;
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// Cook-Torrance BRDF
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float NDF = distributionGGX(N, H, roughness);
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float G = geometrySmith(N, V, L, roughness);
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vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
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vec3 numerator = NDF * G * F;
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float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001;
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vec3 specular = numerator / denominator;
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vec3 kS = F;
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vec3 kD = vec3(1.0) - kS;
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kD *= 1.0 - metallic;
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float NdotL = max(dot(N, L), 0.0);
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return (kD * albedo / PI + specular) * radiance * NdotL;
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}
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void main()
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{
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vec4 text_color = texture(textureSampler, outTextCoords);
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if(text_color.a < 0.5) discard;
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vec4 diffuse = text_color;
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mat3 TBN = mat3(outTangent, outBitangent, outNormal);
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vec3 newNormal = calcNormal(material, outNormal, outTextCoords, TBN);
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float ao = 0.5;
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float roughnessFactor = 0.0;
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float metallicFactor = 0.0;
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if (material.hasRoughMap > 0) {
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vec4 metRoughValue = texture(roughnessSampler, outTextCoords);
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roughnessFactor = metRoughValue.g;
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metallicFactor = metRoughValue.b;
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} else {
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roughnessFactor = material.roughnessFactor;
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metallicFactor = material.metallicFactor;
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}
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vec4 specular = text_color + metallicFactor - roughnessFactor;
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vec4 pbr = vec4(ao, roughnessFactor, metallicFactor, text_color.a);
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float roughness = pbr.g;
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float metallic = pbr.b;
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vec3 N = normalize(newNormal);
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vec3 V = normalize(sceneInfo.camPos - outPos.rgb);
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vec3 F0 = vec3(0.04);
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F0 = mix(F0, text_color.rgb, metallic);
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vec3 Lo = vec3(0.0);
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for (int i = 0; i < sceneInfo.LightCount; i++) {
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Light light = lights[i];
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vec3 Pos = vec3(outPos.rgb);
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if (light.lightType == 1) {
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//Lo += calculateDirectionalLight(light, V, N, F0, text_color.rgb, metallic, roughness);
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Lo += calcDirLight(diffuse, specular, light, Pos, outNormal,metallic).rgb;
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} else {
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// Lo += calculatePointLight(light, outPos.rgb, V, N, F0, text_color.rgb, metallic, roughness);
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Lo += calcPointLight(diffuse, specular, light, Pos, outNormal,metallic).rgb;
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}
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}
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vec3 ambient = sceneInfo.ambientLightColor * text_color.rgb * sceneInfo.ambientLightIntensity;
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vec3 color = ambient + Lo;
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fragColor = vec4(color, 1.0f);
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} |