Add lighting system -IN PROGRESS-

Improved materials

src/raylib.h

@@ -422,13 +422,38 @@ typedef struct Material {
     float normalDepth;          // Normal map depth
 } Material;
 
-// 3d Model type
+// Model type
 typedef struct Model {
     Mesh mesh;                  // Vertex data buffers (RAM and VRAM)
     Matrix transform;           // Local transform matrix
     Material material;          // Shader and textures data
 } Model;
 
+// Light type
+// TODO: Review contained data to support different light types and features
+typedef struct LightData {
+    int id;
+    int type;           // LIGHT_POINT, LIGHT_DIRECTIONAL, LIGHT_SPOT
+    bool enabled;
+    
+    Vector3 position;
+    Vector3 direction;  // Used on LIGHT_DIRECTIONAL and LIGHT_SPOT (cone direction)
+    float attenuation;  // Lost of light intensity with distance (use radius?)
+    
+    Color diffuse;      // Use Vector3 diffuse (including intensities)?
+    float intensity;
+    
+    Color specular;
+    //float specFactor;   // Specular intensity ?
+
+    //Color ambient;    // Required?
+    
+    float coneAngle;         // SpotLight
+} LightData, *Light;
+
+// Light types
+typedef enum { LIGHT_POINT, LIGHT_DIRECTIONAL, LIGHT_SPOT } LightType;
+
 // Ray type (useful for raycast)
 typedef struct Ray {
     Vector3 position;
@@ -849,6 +874,9 @@ void SetShaderValueMatrix(Shader shader, int uniformLoc, Matrix mat);       // S
 
 void SetBlendMode(int mode);                                        // Set blending mode (alpha, additive, multiplied)
 
+Light CreateLight(int type, Vector3 position, Color diffuse);       // Create a new light, initialize it and add to pool
+void DestroyLight(Light light);                                     // Destroy a light and take it out of the list
+
 //----------------------------------------------------------------------------------
 // Physics System Functions (Module: physac)
 //----------------------------------------------------------------------------------