Texture quality | GameDev.net

I created a project based on Lesson 9 from Nehe in c# to load a ordered list of bitmaps and display them as an animation on Ortho mode. This works great so I decided I would move the project to C++. This also SEEMS to work fine except one problem, loading the same exact bitmaps the C# version of the application draws the bitmaps as they should be while the C++ project seems to draw them at a lower resolution. Both of the load routines come straight from the tutorials. C#:


protected bool LoadTexture( string filename, uint[] htexture, int txtrindex )
{
	Bitmap image = null;
		
	try
	{
		image = new Bitmap(filename);
	} 
	catch (System.ArgumentException)
	{
		MessageBox.Show("Could not load " + filename + ".  Please make sure that Data is a subfolder from where the application is running.", "Error", MessageBoxButtons.OK);
		this.finished = true;
		return false;
	}
	if (image != null)
	{
		image.RotateFlip(RotateFlipType.RotateNoneFlipXY);
		System.Drawing.Imaging.BitmapData bitmapdata;
		Rectangle rect = new Rectangle(0, 0, image.Width, image.Height);
		bitmapdata = image.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
		
			
		GL.glBindTexture(GL.GL_TEXTURE_2D, this.textures[txtrindex]);
		GL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
		GL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);
		GL.glTexImage2D(GL.GL_TEXTURE_2D, 0, (int)GL.GL_RGB, image.Width, image.Height, 0, GL.GL_BGR_EXT, GL.GL_UNSIGNED_BYTE, bitmapdata.Scan0);

		image.UnlockBits(bitmapdata);
		image.Dispose();
		return true;
	}
	 	return false;
}		}

C++:


AUX_RGBImageRec *LoadBMP(char *Filename)                // Loads A Bitmap Image
{
        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
}

BOOL LoadTexture(std::string filename, int index)
{
    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((char*)filename.c_str()))
        {
                Status=TRUE;                            // Set The Status To TRUE

                

                // Create Linear Filtered Texture
                glBindTexture(GL_TEXTURE_2D, texture[index]);
                glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
                glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, 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
}

Is there something else which may be causing it? The images are 512x512 (71dpi) created with Gimp 2.0. The application runs full screen with a 16 bit depth. I tried changing this to 32 but this did not help. Thanks kvn [edit: added source tags to reduce chaos. /Yann] [Edited by - Yann L on December 27, 2004 3:37:38 PM]

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