Re: Emulate D3D9's StretchRect
Ray Ratelis <ray <at> guildsoftware.com>
2007-07-04 03:05:35 GMT
Ok, I got it working. It works pretty well, too. Not as fast as d3d
StretchRect but it's good enough for now.
I had to download a recent nvidia driver from guru3d.com to get the
extension.
- Ray
Ray Ratelis wrote:
> For a heads up, nvidia doesn't have a driver that supports this
> extension for WinXP.
> Does anyone know if this extension will ever see the light of day on
> Linux or Mac OS X? Those are the platforms I need it on. Windows uses
> can just run the dx9 version of our game.
>
> Or is this extension an integrated part of OpenGL 2.0?
>
> - Ray
>
> Ray Ratelis wrote:
>> Thanks. I assume I can attach a texture to a framebuffer object and
>> then set the read framebuffer to 0 and the draw framebuffer to the one
>> with the attached texture and then use the framebuffer_blit function
>> to copy the main buffer into the texture.
>>
>> My video card driver doesn't have the framebuffer_blit extension,
>> though. I'll see if the more recent driver has it. I'm using a Geforce
>> Go 7600 on a laptop.
>>
>> - Ray
>>
>> Michael I Gold wrote:
>>> You want this:
>>>
>>> http://www.opengl.org/registry/specs/EXT/framebuffer_blit.txt
>>>
>>>
>>> Ray Ratelis wrote:
>>>> I'm porting some code from D3D9 to OpenGL and the D3D9 version uses
>>>> StretchRect to copy the frame buffer (which is usually non pow2)
>>>> into a pow2 texture. How would I do this in OpenGL?
>>>>
>>>> One way I was thinking of was to CopyTexImage2D into a non-pow2
>>>> texture rectangle and then use a pow2 offscreen-context (the same
>>>> size as my destination pow2 texture) to render the texture rectangle
>>>> into using a simple quad. Then I would CopyTexImage2D into my
>>>> destination pow2 texture. That sounds horribly inefficient. Is there
>>>> a better way?
>>>>
>>>> This will happen a few times per frame, so I don't want to copy the
>>>> background buffer to system memory and do a scale there.
>>>>
>>>> Any ideas are helpful.
>>>>
>>>> - Ray
>>>> ----- FAQ and OpenGL Resources at:
>>>> http://www.geocities.com/SiliconValley/Hills/9956/OpenGL
>>>>
>>> ----- FAQ and OpenGL Resources at:
>>> http://www.geocities.com/SiliconValley/Hills/9956/OpenGL -- Author:
>>> Michael I Gold INET: gold <at> berkelium.com Fat City Hosting, San Diego,
>>> California -- http://www.fatcity.com
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>> ----- FAQ and OpenGL Resources at:
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>>
> ----- FAQ and OpenGL Resources at:
> http://www.geocities.com/SiliconValley/Hills/9956/OpenGL
>
-----
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--
--
Author: Ray Ratelis
INET: ray <at> guildsoftware.com
Fat City Hosting, San Diego, California -- http://www.fatcity.com
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