多光源 1.固定光（环境光 漫反射 镜面反射） 2.点光源 3.聚光灯

[LeeMcQueen]

今天研究有关于多光源的配置 Multiple lights

多光源 1.定向光 2.点光源 3.聚光灯 的大概逻辑和函数构造 out vec4 FragColor; void main() { vec3 output; //定向光源 output += someFunctionToCalculateDirectionaLight(); for(int i = 0; i < nr_of_point_lights; i++) //点光源 output += someFunctionToCalculatePointLight;

output += someFunctionCalculateSpotLight();

FragColor = vec4(output, 1.0); }

-----------------------------定向光----------------------------------- 定向光构造体 struct DirLight{ vec3 direction;

vec3 ambient;
vec3 diffuse;
vec3 specular;

} uniform DirLight dirLight;

定向光源实现函数 参数1.定向光结构体 2.vec3法线 3.vec3相机位置 返回值 vec3 vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir); { //光的方向取反在正规化 vec3 lightDir = normalize(-light.direction); //漫反射diffues着色 float diff = max(dot(normal, lightDir), 0.0); //镜面光着色 vec3 reflectDir = reflect(-lightDir, normal); float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);

//合并结果
vec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));
vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));
vec3 specular = light.specular * spec * vec3(texture(material.specular, texCoords));

return(ambient + diffuse + specular);

}

----------------------------点光源----------------------------------- 点光源结构体 struct PointLight{ vec3 position;

//固定的是点的位置吗？
float constant;

float linear;
float quadratic;

vec3 ambient;
vec3 diffuse;
vec3 specular;

};

define NR_POINT_LIGHTS 4

uniform PointLight pointLight[NR_POINT_LIGHTS];

点光源实现函数 参数1.点光源结构体 2.vec3法线 3.vec3目标位置 4.vec3相机位置 vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir) { vec3 lightDir = normalize(light.position - fragPos);

//漫反射着色
float diff = max(dot(normal, lightDir), 0.0);

vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);

//衰减
float distance = length(light.position - fragPos);
float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));

//合并结果
vec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));
vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));
vec3 specular = light.specular * spec * vec3(textrue(material.specular, TexCoords));

//1.环境光 2.漫反射 3.镜面反射的衰减合并
ambient *= attenuation;
diffuse *= att

}