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shaders/includes/glsl/lighting.h

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+/* Copyright (c) 2020-2025, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+struct Light
+{
+	vec4 position;         // position.w represents type of light
+	vec4 color;            // color.w represents light intensity
+	vec4 direction;        // direction.w represents range
+	vec2 info;             // (only used for spot lights) info.x represents light inner cone angle, info.y represents light outer cone angle
+};
+
+vec3 apply_directional_light(Light light, vec3 normal)
+{
+	vec3 world_to_light = -light.direction.xyz;
+	world_to_light      = normalize(world_to_light);
+	float ndotl         = clamp(dot(normal, world_to_light), 0.0, 1.0);
+	return ndotl * light.color.w * light.color.rgb;
+}
+
+vec3 apply_point_light(Light light, vec3 pos, vec3 normal)
+{
+	vec3  world_to_light = light.position.xyz - pos;
+	float dist           = length(world_to_light) * 0.005;
+	float atten          = 1.0 / (dist * dist);
+	world_to_light       = normalize(world_to_light);
+	float ndotl          = clamp(dot(normal, world_to_light), 0.0, 1.0);
+	return ndotl * light.color.w * atten * light.color.rgb;
+}
+
+vec3 apply_spot_light(Light light, vec3 pos, vec3 normal)
+{
+	vec3  light_to_pixel   = normalize(pos - light.position.xyz);
+	float theta            = dot(light_to_pixel, normalize(light.direction.xyz));
+	float inner_cone_angle = light.info.x;
+	float outer_cone_angle = light.info.y;
+	float intensity        = (theta - outer_cone_angle) / (inner_cone_angle - outer_cone_angle);
+	return smoothstep(0.0, 1.0, intensity) * light.color.w * light.color.rgb;
+}