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Light.h

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+#ifndef LIGHT_CLASS
+#define LIGHT_CLASS
+
+#include <glm/glm.hpp>
+
+// These have to match the sizes in deferred_lighting.frag and default.frag
+static constexpr int MAX_DIRECTIONAL_LIGHTS = 4;
+static constexpr int MAX_POINT_LIGHTS = 16;
+static constexpr int MAX_SPOT_LIGHTS = 8;
+
+// Spot and point shadows share one depth texture cut into tiles.
+// A spot light takes 1 tile, a point light takes 6. Lights past the limit just don't cast shadows.
+static constexpr int SHADOW_ATLAS_COLUMNS = 6;   // has to match the shaders too
+static constexpr int SHADOW_ATLAS_TILES = SHADOW_ATLAS_COLUMNS * SHADOW_ATLAS_COLUMNS;
+static constexpr int SHADOW_ATLAS_TILE_SIZE = 640;
+
+class Light {
+public:
+	glm::vec3 color = glm::vec3(1.0f);   // linear rgb
+	float intensity = 1.0f;
+	bool castShadow = true;   // spot and point lights, the sun always has its own shadow map
+	int shadowTile = -1;      // first atlas tile, set each frame by the render system
+};
+
+// Parallel rays with no position, so it lights the whole scene from one direction
+class DirectionalLight : public Light {
+public:
+	glm::vec3 direction = glm::vec3(0.0f, -1.0f, 0.0f);   // the way the light travels
+};
+
+// Fades with distance and reaches nothing past radius
+class PointLight : public Light {
+public:
+	glm::vec3 position = glm::vec3(0.0f);
+	float radius = 10.0f;
+};
+
+// A cone from a point. Full brightness inside innerAngle, fading to nothing at outerAngle.
+class SpotLight : public Light {
+public:
+	glm::vec3 position = glm::vec3(0.0f);
+	glm::vec3 direction = glm::vec3(0.0f, -1.0f, 0.0f);   // the way the cone points
+	float radius = 20.0f;
+	float innerAngle = 20.0f;   // degrees from the center of the cone
+	float outerAngle = 30.0f;
+};
+
+#endif