rectangle.h

#ifndef RECTANGLE_H
#define RECTANGLE_H

#ifdef __cplusplus
extern "C" {
#endif


#include "vector3_cl.h"
//#include "color3.h"

//static const int   SUPER_SAMPLING = 1;


/* Rectangle structure to be passed to OpenCL
 * - the alignment is required by OpenCL
 * - this struct should be as compact as possible to save vector registers on AMD OpenCL 
 */
typedef struct __attribute__ ((aligned(16))) Rectangle{
    Vector3 pos, width, height, n;
//    Vector3 color;
    cl_int3 lightmapSetup; // [0] = lightBaseIdx, [1] = tiles_width, [2] = tiles_height
//    int lightNumTiles;
//    int hNumTiles, vNumTiles;
//    float 
} Rectangle;

typedef struct {
    Rectangle *data;
    cl_int numItems;
    cl_int maxNumItems;
} RectangleArray;


Rectangle createRectangleV( const Vector3 _pos, const Vector3 _width, const Vector3 _height, const float TILE_SIZE);
Rectangle createRectangle( float px, float py, float pz,
                           float wx, float wy, float wz,
                           float hx, float hy, float hz, float TILE_SIZE);

float distanceOfIntersectionWithPlane(Vector3 raySrc, Vector3 rayDir, Vector3 planeNormal, Vector3 planePos);
float distanceOfIntersectionWithRectPlane( Vector3 raySrc, Vector3 rayDir, const Rectangle *plane);

int   getPosition(const Rectangle *plane, const Rectangle *rect);
float getDistanceToPlane(const Rectangle *plane, const Vector3 p);
float getShortestDistanceRectToPoint( const Rectangle *rect, const Vector3 p);

float intersects(        const Rectangle *rect, Vector3 raySrc, Vector3 rayDir, float closestDist);
int   isBehindRay(       const Rectangle *rect, Vector3 raySrc, Vector3 rayDir);
int   getNumTiles(       const Rectangle *rect);
int   getNumMipmapTexels(const Rectangle *rect);
float getArea(           const Rectangle *rect);
int   getTileIdAt(       const Rectangle *rect, const Vector3 p);
int   getMipmapTexelId(  const Rectangle *rect, int x, int y, int mipmapLevel);
void  mipmap(            const Rectangle *rect, Vector3* texels);


Vector3 getDiffuseColor(const Rectangle *rect, const Vector3 pos);
Vector3 getOrigin(      const Rectangle *rect);
Vector3 getWidthVector( const Rectangle *rect);
Vector3 getHeightVector(const Rectangle *rect);
Vector3 getTileCenter(  const Rectangle *rect, int tileId);
void  saveAs(           const Rectangle *rect, const char *filename, const Vector3 *lights, int tintExtra);
void  saveAsRaw(        const Rectangle *rect, const char *filename, const Vector3 *lights);
//int   saveAsMemoryPng(  const Rectangle *rect, const Vector3 *lights, int tintExtra, uint8_t**data);
char* saveAsBase64Png(  const Rectangle *rect, const Vector3 *lights, int tintExtra);


RectangleArray initRectangleArray();
void freeRectangleArray(      RectangleArray *arr);
void resizeRectangleArray(    RectangleArray *arr, int newSize);
void insertIntoRectangleArray(RectangleArray *arr, Rectangle rect);



#ifdef __cplusplus
}
#endif


#endif