/*=============================================================================
	texture.cpp: Basic OpenGL Framework texture function definitions

    Revision history:
	* Created by Zack Smith
	* Inspired by code written by NeHe (http://nehe.gamedev.net/)
=============================================================================*/

#include "application.h"
#include "log.h"
#include "texture.h"        // Header file that handles textures


/*-----------------------------------------------------------------------------
    CRender class function definitions.
-----------------------------------------------------------------------------*/

CTexture::CTexture()
{
	pApp->pLog->Log("Texture Class...intialized");
}

CTexture::~CTexture()
{
	glDeleteTextures(1, &texture2d);
	pApp->pLog->Log("Texture Class...destroyed");
}

AUX_RGBImageRec *CTexture::LoadBMP(char *Filename)
{
	FILE *File=NULL;									// File Handle

	if (!Filename)										// Make Sure A Filename Was Given
	{
		return NULL;									// If Not Return NULL
	}

	File=fopen(Filename,"r");							// Check To See If The File Exists

	if (File)											// Does The File Exist?
	{
		fclose(File);									// Close The Handle
		return auxDIBImageLoad(Filename);				// Load The Bitmap And Return A Pointer
	}

	return NULL;										// If Load Failed Return NULL
}

int CTexture::LoadGLTexture(char *filename)
{
	int Status=FALSE;									// Status Indicator

	AUX_RGBImageRec *TextureImage[1];					// Create Storage Space For The Texture

	memset(TextureImage,0,sizeof(void *)*1);           	// Set The Pointer To NULL

	// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit
	if (TextureImage[0]=LoadBMP(filename))
	{
		Status=TRUE;									// Set The Status To TRUE

		glGenTextures(1, &texture2d);					// Create The Texture

		// Typical Texture Generation Using Data From The Bitmap
		glBindTexture(GL_TEXTURE_2D, texture2d);
		glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);

		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
		
		// replace the previous line with these 2 if you want to use MipMapping
		//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
		//gluBuild2DMipmaps(GL_TEXTURE_2D, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data); 

	}

	if (TextureImage[0])									// If Texture Exists
	{
		if (TextureImage[0]->data)							// If Texture Image Exists
		{
			free(TextureImage[0]->data);					// Free The Texture Image Memory
		}

		free(TextureImage[0]);								// Free The Image Structure
	}
	return Status;										// Return The Status
}

/*-----------------------------------------------------------------------------
	The End.
-----------------------------------------------------------------------------*/