for anyone who likes a challange...

OpenGL OpenGL: Basic Coding
1

this is my semi-finished code for loading a bmp, but when linking i get… error LNK2001: unresolved external symbol _auxDIBImageLoadA@4 … any ideas??

void LoadTexture(patch *tmp)
{

glGenTextures(1, &tmp->Texture);					// Generate 1 Texture

ifstream inputFile(tmp->TexFilename);

tmp->TextureImage = NULL;


if (!(inputFile))
{
	delete tmp->TextureImage;
	exit(0);
}
else
{
	inputFile.close();										// Close The File
	tmp->TextureImage = auxDIBImageLoad(tmp->TexFilename);		// And Load The Texture
}


	// Typical Texture Generation Using Data From The Bitmap
	glBindTexture(GL_TEXTURE_2D, tmp->Texture);

		// Generate The Texture
	glTexImage2D(GL_TEXTURE_2D,						// 2D texture
						0,							// Detail level
						3,							// No. of components (RGB)
						tmp->TextureImage->sizeX,// Dimensions of texture
						tmp->TextureImage->sizeY, 
						0,	
						GL_RGB,						// Using RGB 
						GL_UNSIGNED_BYTE,			// Made up of UB's
						tmp->TextureImage->data);// Position of actual data

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // Linear Filtering
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // Linear Filtering

if (tmp->TextureImage->data)
delete tmp->TextureImage->data;

}

2

Yes =)

You have to link the libary wich contains the funktion (in your case auxDIBImageLoad()) to your project!

i thing it’s the glaux.lib (Don’t hit me for that, i’m at work and can’t take a fast look)

3

arrrrrrg I cant belive i missed that! previously the program had been running so I didnt think that id need another lib file.

arrg I think ill blame Microsoft to make me feel better :stuck_out_tongue:

4

of course, you could write your own bmp loader, but i guess it’s not as portable?

(i just hate aux anything)

5

thanx for all you help. I have got it going now, but for some reason my whole scene has change to a darker color. any ideas?

6

the whole scene is darker? your bmp, or everything you draw?

if it’s just the bitmap then i’d suggest you’re casting your pixels to a higher integer. i mean, if your bitmap is stored n GL_UNSIGNED_BYTE and you cast the RGB to GLU_UNSIGNED_INT, then you’re going to end up with a markedly darker image.

just an idea

cheers,
John

7

It is my whole image that appears darker. Im just playing around now, and if i delete these lines:

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // Linear Filtering
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // Linear Filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

Then it works. I do know that these may not be the actual problem, but if anyone has any ideas…

thanks

8

Does it appear that the texture could be blending with the color of the objects? Try using

glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);

(Or GL_REPLACE instead of GL_DECAL)

9

Hmmmm that didnt work. Thanks for you help though. :eek: :stuck_out_tongue: