// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { glsl } from "../../../lib/glsl-utils/highlight.js";
export const lightingShader = `\
uniform float lighting_uAmbient;
uniform float lighting_uDiffuse;
uniform float lighting_uShininess;
uniform vec3  lighting_uSpecularColor;
vec3 lighting_getLightColor(vec3 surfaceColor, vec3 light_direction, vec3 view_direction, vec3 normal_worldspace, vec3 color) {
vec3 halfway_direction = normalize(light_direction + view_direction);
float lambertian = dot(light_direction, normal_worldspace);
float specular = 0.0;
if (lambertian > 0.0) {
float specular_angle = max(dot(normal_worldspace, halfway_direction), 0.0);
specular = pow(specular_angle, lighting_uShininess);
}
lambertian = max(lambertian, 0.0);
return (lambertian * lighting_uDiffuse * surfaceColor + specular * lighting_uSpecularColor) * color;
}
vec3 lighting_getLightColor(vec3 surfaceColor, vec3 cameraPosition, vec3 position_worldspace, vec3 normal_worldspace) {
vec3 lightColor = surfaceColor;
if (lighting_uEnabled) {
vec3 view_direction = normalize(cameraPosition - position_worldspace);
lightColor = lighting_uAmbient * surfaceColor * lighting_uAmbientLight.color;
for (int i = 0; i < MAX_LIGHTS; i++) {
if (i >= lighting_uPointLightCount) {
break;
}
PointLight pointLight = lighting_uPointLight[i];
vec3 light_position_worldspace = pointLight.position;
vec3 light_direction = normalize(light_position_worldspace - position_worldspace);
lightColor += lighting_getLightColor(surfaceColor, light_direction, view_direction, normal_worldspace, pointLight.color);
}
for (int i = 0; i < MAX_LIGHTS; i++) {
if (i >= lighting_uDirectionalLightCount) {
break;
}
DirectionalLight directionalLight = lighting_uDirectionalLight[i];
lightColor += lighting_getLightColor(surfaceColor, -directionalLight.direction, view_direction, normal_worldspace, directionalLight.color);
}
}
return lightColor;
}
vec3 lighting_getSpecularLightColor(vec3 cameraPosition, vec3 position_worldspace, vec3 normal_worldspace) {
vec3 lightColor = vec3(0, 0, 0);
vec3 surfaceColor = vec3(0, 0, 0);
if (lighting_uEnabled) {
vec3 view_direction = normalize(cameraPosition - position_worldspace);
for (int i = 0; i < MAX_LIGHTS; i++) {
if (i >= lighting_uPointLightCount) {
break;
}
PointLight pointLight = lighting_uPointLight[i];
vec3 light_position_worldspace = pointLight.position;
vec3 light_direction = normalize(light_position_worldspace - position_worldspace);
lightColor += lighting_getLightColor(surfaceColor, light_direction, view_direction, normal_worldspace, pointLight.color);
}
for (int i = 0; i < MAX_LIGHTS; i++) {
if (i >= lighting_uDirectionalLightCount) {
break;
}
DirectionalLight directionalLight = lighting_uDirectionalLight[i];
lightColor += lighting_getLightColor(surfaceColor, -directionalLight.direction, view_direction, normal_worldspace, directionalLight.color);
}
}
return lightColor;
}
`;