112 lines
4.1 KiB
GLSL
112 lines
4.1 KiB
GLSL
#version 330 core
|
|
|
|
#define POINT_LIGHT_COUNT 4
|
|
|
|
struct Material {
|
|
sampler2D diffuse1;
|
|
sampler2D specular1;
|
|
float shininess;
|
|
};
|
|
|
|
struct DirLight {
|
|
vec3 direction;
|
|
vec3 ambient;
|
|
vec3 diffuse;
|
|
vec3 specular;
|
|
};
|
|
|
|
struct PointLight {
|
|
vec3 position;
|
|
vec3 ambient;
|
|
vec3 diffuse;
|
|
vec3 specular;
|
|
float constant;
|
|
float linear;
|
|
float quadratic;
|
|
};
|
|
|
|
struct SpotLight {
|
|
vec3 position;
|
|
vec3 direction;
|
|
vec3 ambient;
|
|
vec3 diffuse;
|
|
vec3 specular;
|
|
float cutoff;
|
|
float outer_cutoff;
|
|
};
|
|
|
|
in vec3 vert_normal;
|
|
in vec3 frag_position;
|
|
in vec2 uv_coords;
|
|
|
|
out vec4 color;
|
|
|
|
uniform Material material;
|
|
uniform DirLight directional_light;
|
|
uniform PointLight point_lights[POINT_LIGHT_COUNT];
|
|
uniform SpotLight spot_light;
|
|
uniform vec3 camera_position;
|
|
|
|
vec3 calc_dir_light(DirLight light, vec3 normal, vec3 view_direction);
|
|
vec3 calc_point_light(PointLight light, vec3 normal, vec3 frag_position, vec3 view_direction);
|
|
vec3 calc_spot_light(SpotLight light, vec3 normal, vec3 frag_position, vec3 view_direction);
|
|
|
|
void main() {
|
|
vec3 normal = normalize(vert_normal);
|
|
vec3 view_direction = normalize(camera_position - frag_position);
|
|
|
|
vec3 result = calc_dir_light(directional_light, normal, view_direction);
|
|
|
|
for (int i = 0; i < POINT_LIGHT_COUNT; ++i) {
|
|
result += calc_point_light(point_lights[i], normal, frag_position, view_direction);
|
|
}
|
|
|
|
result += calc_spot_light(spot_light, normal, frag_position, view_direction);
|
|
|
|
color = vec4(result, 1.0);
|
|
};
|
|
|
|
vec3 calc_dir_light(DirLight light, vec3 normal, vec3 view_direction) {
|
|
vec3 light_direction = normalize(-light.direction);
|
|
vec3 reflect_direction = reflect(-light_direction, normal);
|
|
float diff = max(dot(normal, light_direction), 0.0);
|
|
vec3 diff_tex = vec3(texture(material.diffuse1, uv_coords));
|
|
float spec = pow(max(dot(reflect_direction, view_direction), 0.0), material.shininess);
|
|
vec3 ambient = light.ambient * diff_tex;
|
|
vec3 diffuse = light.diffuse * (diff * diff_tex);
|
|
vec3 specular = light.specular * (spec * vec3(texture(material.specular1, uv_coords)));
|
|
|
|
return ambient + diffuse + specular;
|
|
}
|
|
|
|
vec3 calc_point_light(PointLight light, vec3 normal, vec3 frag_position, vec3 view_direction) {
|
|
vec3 light_direction = normalize(light.position - frag_position);
|
|
vec3 reflect_direction = reflect(-light_direction, normal);
|
|
float distance = length(light.position - frag_position);
|
|
float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
|
|
float diff = max(dot(normal, light_direction), 0.0);
|
|
vec3 diff_tex = vec3(texture(material.diffuse1, uv_coords));
|
|
float spec = pow(max(dot(reflect_direction, view_direction), 0.0), material.shininess);
|
|
vec3 ambient = light.ambient * diff_tex * attenuation;
|
|
vec3 diffuse = light.diffuse * (diff * diff_tex) * attenuation;
|
|
vec3 specular = light.specular * (spec * vec3(texture(material.specular1, uv_coords))) * attenuation;
|
|
|
|
return ambient + diffuse + specular;
|
|
}
|
|
|
|
vec3 calc_spot_light(SpotLight light, vec3 normal, vec3 frag_position, vec3 view_direction) {
|
|
vec3 light_direction = normalize(light.position - frag_position);
|
|
vec3 reflect_direction = reflect(-light_direction, normal);
|
|
float theta = dot(light_direction, normalize(-light.direction));
|
|
float epsilon = light.cutoff - light.outer_cutoff;
|
|
float intensity = clamp((theta - light.outer_cutoff) / epsilon, 0.0, 1.0);
|
|
float diff = max(dot(normal, light_direction), 0.0);
|
|
float spec = pow(max(dot(reflect_direction, view_direction), 0.0), material.shininess);
|
|
vec3 diff_tex = vec3(texture(material.diffuse1, uv_coords));
|
|
vec3 ambient = light.ambient * diff_tex;
|
|
vec3 diffuse = light.diffuse * (diff * diff_tex) * intensity;
|
|
vec3 specular = light.specular * (spec * vec3(texture(material.specular1, uv_coords))) * intensity;
|
|
|
|
return ambient + diffuse + specular;
|
|
}
|