How to display only part of texture

Graphics and GPU Programming Programming OpenGL

Started by Shmuel January 17, 2005 04:54 PM

2 comments, last by Shmuel 19 years, 3 months ago

145

Author

January 17, 2005 04:54 PM

I'm porting my engine's renderer from SDL to OpenGL. In SDL, I would use srcrect in the SDL_BlitSurface function and could specify what part of image to blit. How would I do this with OpenGL? I only want to have one texture for all of the tiles.

case ShmuelPosted:StupidPosts++;

Solias

564

January 17, 2005 05:00 PM

You'll just need to change the texture coords you pass ogl. For example if you have a textured quad and you want to display one quarter of the texture you could have the texture coords for the 4 verts of the quad run from 0 to 0.5. You'll want to look at glTexCoord and glTexCoordPointer for details.

Nemesis2k2

1,045

January 17, 2005 05:04 PM

glTexSubImage2D should do what you want.

EDIT: Description from MSDN.

Shmuel

145

Author

January 17, 2005 05:09 PM

Quote:Original post by Nemesis2k2
glTexSubImage2D should do what you want.

EDIT: Description from MSDN.

Thanks, that was exactly what I wanted. Rating++

case ShmuelPosted:StupidPosts++;

How to display only part of texture

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How to display only part of texture

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