#ifndef texture_h
#define texture_h
#include <gl/gl.h>
#include <windows.h>
#include <cstdio>
#include <cstdlib>
#define BITMAP_ID 0x4D42
BITMAPINFOHEADER	bitmapInfoHeader;	// bitmap info header
unsigned char*		bitmapData;			// the texture data
unsigned int		texture;			// the texture object

// LoadBitmapFile
// desc: Returns a pointer to the bitmap image of the bitmap specified
//       by filename. Also returns the bitmap header information.
//		 No support for 8-bit bitmaps.
unsigned char *LoadBitmapFile(char *filename, BITMAPINFOHEADER *bitmapInfoHeader)
{
	FILE *filePtr;							// the file pointer
	BITMAPFILEHEADER	bitmapFileHeader;		// bitmap file header
	unsigned char		*bitmapImage;			// bitmap image data
	int					imageIdx = 0;		// image index counter
	unsigned char		tempRGB;				// swap variable

	// open filename in "read binary" mode
	filePtr = fopen(filename, "rb");
	if (filePtr == NULL)
		return NULL;

	// read the bitmap file header
	fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER), 1, filePtr);
	
	// verify that this is a bitmap by checking for the universal bitmap id
	if (bitmapFileHeader.bfType != BITMAP_ID)
	{
		fclose(filePtr);
		return NULL;
	}

	// read the bitmap information header
	fread(bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, filePtr);

	// move file pointer to beginning of bitmap data
	fseek(filePtr, bitmapFileHeader.bfOffBits, SEEK_SET);

	// allocate enough memory for the bitmap image data
	bitmapImage = (unsigned char*)malloc(bitmapInfoHeader->biSizeImage);

	// verify memory allocation
	if (!bitmapImage)
	{
		free(bitmapImage);
		fclose(filePtr);
		return NULL;
	}

	// read in the bitmap image data
	fread(bitmapImage, 1, bitmapInfoHeader->biSizeImage, filePtr);
	
	// make sure bitmap image data was read
	if (bitmapImage == NULL)
	{
		fclose(filePtr);
		return NULL;
	}

	// swap the R and B values to get RGB since the bitmap color format is in BGR
	// swap the R and B values to get RGB since the bitmap color format is in BGR
	for (imageIdx = 0; imageIdx < bitmapInfoHeader->biSizeImage; imageIdx+=3)
	{
		tempRGB = bitmapImage[imageIdx];
		bitmapImage[imageIdx] = bitmapImage[imageIdx + 2];
		bitmapImage[imageIdx + 2] = tempRGB;
	}

	// close the file and return the bitmap image data
	fclose(filePtr);
	return bitmapImage;
}

void DrawGround(float xPos, float yPos, float zPos)
{
		glBegin(GL_POLYGON);
		glTexCoord2f(0.0f,0.0f);	glVertex2f(-28.0f, -40.0f);
		glTexCoord2f(0.0f,1.0f);	glVertex2f(-28.0f, -15.0f);
		glTexCoord2f(1.0f,1.0f);	glVertex2f(28.0f,-15.0f);
		glTexCoord2f(1.0f,0.0f);	glVertex2f(28.0f,-40.0f);
		glEnd();
}
void Initialize()
{
	glEnable(GL_TEXTURE_2D);					// enable 2D texturing
	// load our bitmap file
	bitmapData = LoadBitmapFile("sand128.bmp", &bitmapInfoHeader);

	glGenTextures(1, &texture);                  // generate texture object
	glBindTexture(GL_TEXTURE_2D, texture);       // enable our texture object
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

     // generate the texture image
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, bitmapInfoHeader.biWidth,
				 bitmapInfoHeader.biHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, bitmapData);
}
#endif