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#ifndef __ogl2_particle_h__
#define __ogl2_particle_h__

#include <windows.h>
#include <winuser.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>
#include <GL/glu.h>
#include "glut.h"
#include <crtdbg.h>

#include "glext.h"

////////////////
// Structures //
////////////////

//
// Shader types
//
typedef enum {
    EVertexShader,
    EFragmentShader,
} EShaderType;


//
// Constants
//
#define VELOCITY_ARRAY_INDEX 3
#define START_TIME_ARRAY_INDEX 4
#define RANDOM_ARRAY_INDEX 5

static const int numParticles = 50000;
static const float emitterRadius = 0.4f;


//
// OpenGL Shading Language entry points
//

extern PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB;
extern PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB;
extern PFNGLDELETEOBJECTARBPROC glDeleteObjectARB;
extern PFNGLDETACHOBJECTARBPROC glDetachObjectARB;
extern PFNGLATTACHOBJECTARBPROC glAttachObjectARB;

extern PFNGLSHADERSOURCEARBPROC glShaderSourceARB;
extern PFNGLCOMPILESHADERARBPROC glCompileShaderARB;
extern PFNGLLINKPROGRAMARBPROC glLinkProgramARB;
extern PFNGLGETINFOLOGARBPROC glGetInfoLogARB;
extern PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB;

extern PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB;
extern PFNGLGETOBJECTPARAMETERFVARBPROC glGetObjectParameterfvARB;
extern PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB;

extern PFNGLBINDATTRIBLOCATIONARBPROC glBindAttribLocationARB;

extern PFNGLUNIFORM1FARBPROC glUniform1fARB;
extern PFNGLUNIFORM2FARBPROC glUniform2fARB;
extern PFNGLUNIFORM3FARBPROC glUniform3fARB;
extern PFNGLUNIFORM4FARBPROC glUniform4fARB;

extern PFNGLUNIFORM1IARBPROC glUniform1iARB;
extern PFNGLUNIFORM2IARBPROC glUniform2iARB;
extern PFNGLUNIFORM3IARBPROC glUniform3iARB;
extern PFNGLUNIFORM4IARBPROC glUniform4iARB;

extern PFNGLUNIFORM1FVARBPROC glUniform1fvARB;
extern PFNGLUNIFORM2FVARBPROC glUniform2fvARB;
extern PFNGLUNIFORM3FVARBPROC glUniform3fvARB;
extern PFNGLUNIFORM4FVARBPROC glUniform4fvARB;

extern PFNGLUNIFORM1IVARBPROC glUniform1ivARB;
extern PFNGLUNIFORM2IVARBPROC glUniform2ivARB;
extern PFNGLUNIFORM3IVARBPROC glUniform3ivARB;
extern PFNGLUNIFORM4IVARBPROC glUniform4ivARB;

extern PFNGLVERTEXATTRIB4FVARBPROC glVertexAttrib4fvARB;
extern PFNGLVERTEXATTRIB3FVARBPROC glVertexAttrib3fvARB;
extern PFNGLVERTEXATTRIB2FVARBPROC glVertexAttrib2fvARB;
extern PFNGLVERTEXATTRIB1FVARBPROC glVertexAttrib1fvARB;
extern PFNGLVERTEXATTRIB4FARBPROC glVertexAttrib4fARB;
extern PFNGLVERTEXATTRIB3FARBPROC glVertexAttrib3fARB;
extern PFNGLVERTEXATTRIB2FARBPROC glVertexAttrib2fARB;
extern PFNGLVERTEXATTRIB1FARBPROC glVertexAttrib1fARB;

extern PFNGLVERTEXATTRIBPOINTERARBPROC glVertexAttribPointerARB;
extern PFNGLENABLEVERTEXATTRIBARRAYARBPROC glEnableVertexAttribArrayARB;
extern PFNGLDISABLEVERTEXATTRIBARRAYARBPROC glDisableVertexAttribArrayARB;

extern PFNGLTEXIMAGE3DPROC glTexImage3D;
extern PFNGLACTIVETEXTUREPROC glActiveTexture;


// 
// Objects
//
extern GLhandleARB ProgramObject;
extern GLhandleARB VertexShaderObject;
extern GLhandleARB FragmentShaderObject;

////////////////
// Prototypes //
////////////////

void drawPoints(void);
void createPoints( int numParticles );

int printOglError(char *file, int line);
#define printOpenGLError() printOglError(__FILE__, __LINE__)

void printInfoLog(GLhandleARB object);
GLint getUniLoc(GLhandleARB progObject, const GLcharARB *name);

int readShaderSource(char *fileName, GLcharARB **vertexShader, GLcharARB **fragmentShader);
int installParticleShaders(GLcharARB *particleVertex, GLcharARB *particleFragment);

#endif // __ogl2_particle_h__