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glTexImage2D and multithreading

Started by Lutz Jun 4, 2004 at 10:31 AM 1 replies 2.8k views

Original Post

Jun 4, 2004 at 10:31 AM

Hey! I''ve loaded a texture and passed it to VRam with glTexImage2D while my engine is running. This way I noticed ugly slowdowns. So I''d like to do it in a separate thread. Because I''m quite new to multithreading, I''d like to know two things: 1) Will this solve the slowdowns or at least speed it up a bit? I don''t need the texture at once, so the separate thread may run for a few frames, I don''t care. 2) How will the graphics hardware react to multithreading? If my main thread happens to draw some triangles while the separate thread calls glTexImage2D, will it crash or will it work?

Brother Bob

Jun 4, 2004 at 12:41 PM

The rendering context can only be active in a single thread at a time, so using multithreading for that is not possible.

MENTAL

Jun 4, 2004 at 2:37 PM

that''s why games have "loading" screens

1. render some text saying "loading"

2. load all models and the world

3. load all the textures that are needed for these models

4. begin to render the screen

the loading screen will remain on screen until step 4 (because nothing else is rendering), and will go away when you render the world.

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