Inferno Game Engine
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#version 450 core
layout(location = 0) out vec4 color;
in vec4 v_color;
in vec2 v_textureCoordinates;
in flat uint v_textureIndex;
uniform sampler2D u_textures[32];
// -----------------------------------------
layout(std140, binding = 0) uniform Camera {
mat4 u_projectionView;
vec3 u_position;
};
// -----------------------------------------
struct DirectionalLight {
vec3 direction;
vec3 ambient;
vec3 diffuse;
vec3 specular;
};
const int MAX_DIRECTIONAL_LIGHTS = 4;
layout(std430, binding = 0) buffer DirectionalLights {
DirectionalLight u_directionalLight[MAX_DIRECTIONAL_LIGHTS];
};
// -----------------------------------------
void main()
{
float isObject = texture(u_textures[v_textureIndex + 1], v_textureCoordinates).a;
if (isObject == 0.0f) {
color = vec4(0,0,0,0);
return;
}
vec3 albedo = texture(u_textures[v_textureIndex + 0], v_textureCoordinates).rgb;
float specular = texture(u_textures[v_textureIndex + 0], v_textureCoordinates).a;
vec3 position = texture(u_textures[v_textureIndex + 1], v_textureCoordinates).rgb;
vec3 normal = texture(u_textures[v_textureIndex + 2], v_textureCoordinates).rgb;
vec3 lighting = vec3(0.0f, 0.0f, 0.0f);//albedo * v_color.xyz;
vec3 viewDirection = normalize(u_position - position);
// Loop through all directional lights
for (int i = 0; i < MAX_DIRECTIONAL_LIGHTS; ++i) {
// Diffuse
vec3 lightDirection = normalize(-u_directionalLight[i].direction);
float diffuse = max(dot(normal, lightDirection), 0.0f);
// Specular
vec3 reflectionDirection = reflect(-lightDirection, normal);
float specular = pow(max(dot(viewDirection, reflectionDirection), 0.0f), 32);
lighting +=
(albedo * u_directionalLight[i].ambient) +
(albedo * diffuse * u_directionalLight[i].diffuse) +
(specular * u_directionalLight[i].specular);
}
// Loop through all point lights
// TODO
// vec3 lightDirection = normalize(lightPosition - position);
// float diffuse = max(dot(normal, lightDirection), 0.0f);
// lighting += diffuse * albedo * u_lightColor;
// Loop through all spot lights
// TODO
color = vec4(lighting, 1.0f);
}