video.h

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#ifndef VIDEO_H
#define VIDEO_H

#include "util.h"

#ifdef _WIN32
	#include "wglext.h"		//WGL extensions
	#include "glext.h"		//GL extensions

	// non-vbo
	extern PFNGLDRAWRANGEELEMENTSPROC glDrawRangeElements;
#else // Linux
	//#include <GL/glext.h>
	#include <stdarg.h>
	#include <GL/glext.h>
	#include <GL/glx.h>

	// VBO Extension Definitions, From glext.h
	#define GL_ARRAY_BUFFER_ARB 0x8892
	#define GL_STATIC_DRAW_ARB 0x88E4
	#define GL_STREAM_DRAW_ARB 0x88E0
	#define GL_WRITE_ONLY 0x88B9

	#define GL_COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0
	#define GL_COMPRESSED_RGB_S3TC_DXT3_EXT 0x83F2
	
	// Texture Compression
	typedef void (APIENTRY * PFNGLCOMPRESSEDTEXIMAGE2DARBPROC) (GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const GLvoid *data);

	// Multi Textures
	typedef void (APIENTRY * PFNGLACTIVETEXTUREARBPROC) (GLenum texture);
	typedef void (APIENTRY * PFNGLCLIENTACTIVETEXTUREARBPROC) (GLenum texture);
	typedef void (APIENTRY * PFNGLMULTITEXCOORD2FARBPROC) (GLenum target, GLfloat s, GLfloat t);

	// Draw Range Elements
	//typedef void (APIENTRYP PFNGLDRAWRANGEELEMENTSPROC) (GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const GLvoid *indices);

	// VBO extensions
	typedef void (APIENTRY * PFNGLBINDBUFFERARBPROC) (GLenum target, GLuint buffer);
	typedef void (APIENTRY * PFNGLDELETEBUFFERSARBPROC) (GLsizei n, const GLuint *buffers);
	typedef void (APIENTRY * PFNGLGENBUFFERSARBPROC) (GLsizei n, GLuint *buffers);
	typedef void (APIENTRY * PFNGLBUFFERDATAARBPROC) (GLenum target, int size, const GLvoid *data, GLenum usage);
	//Map/unmap buffer
	typedef GLvoid* (APIENTRY * PFNGLMAPBUFFERARBPROC) (GLenum target, GLenum access);
	typedef GLboolean (APIENTRY * PFNGLUNMAPBUFFERARBPROC) (GLenum target);

#endif

// multi textures
extern PFNGLMULTITEXCOORD2FARBPROC glMultiTexCoord2fARB;
extern PFNGLACTIVETEXTUREARBPROC glActiveTextureARB;
extern PFNGLCLIENTACTIVETEXTUREARBPROC glClientActiveTextureARB;

// compressed textures
extern PFNGLCOMPRESSEDTEXIMAGE2DARBPROC glCompressedTexImage2DARB;

// VBO
extern PFNGLGENBUFFERSARBPROC glGenBuffersARB;
extern PFNGLBINDBUFFERARBPROC glBindBufferARB;
extern PFNGLBUFFERDATAARBPROC glBufferDataARB;
extern PFNGLDELETEBUFFERSARBPROC glDeleteBuffersARB;

extern PFNGLMAPBUFFERARBPROC glMapBufferARB;
extern PFNGLUNMAPBUFFERARBPROC glUnmapBufferARB;

#include "vec3d.h"
#include "manager.h"
#include "mpq.h"
#include "ddslib.h"

using namespace std;

#ifndef PI
	#define PI 3.14159265358f
#endif


#define GL_BUFFER_OFFSET(i) ((char *)(0) + (i))

typedef GLuint TextureID;


class Texture : public ManagedItem {
public:
	int w,h;
	GLuint id;
	bool compressed;

	Texture(std::string name):ManagedItem(name), w(0), h(0), id(0), compressed(false) {}
	void getPixels(unsigned char *buf);

};

class TextureManager : public Manager<GLuint> {
	
public:
	virtual GLuint add(std::string name);
	void doDelete(GLuint id);

	void LoadBLP(GLuint id, Texture *tex);
};

void getTextureData(GLuint tex, unsigned char *buf);

extern bool supportCompression;
extern bool supportMultiTex;
extern bool supportVBO;
extern bool supportDrawRangeElements;

//extern bool supportAntiAlias;
//extern int arbMultisampleFormat;
//extern bool InitMultisample(HDC hDC);

extern TextureManager texturemanager;
extern int gXres, gYres;
void InitExtensions();
void decompressDXTC(GLint format, int w, int h, size_t size, unsigned char *src, unsigned char *dest);

#endif