PBuffer & Render to Texture (read & write)

habicht

Unregistered

Post: #1

Feb 7, 2005 — 06:09 AM

Hi,

I'm trying to render into a pbuffer subbuffer (e.g. WGL_FRONT_LEFT_ARB) and at the same time I want to use subbuffers of the pbuffer (WGL_BACK_LEFT_ARB, WGL_AUX0_ARB) as texture uniforms for my fragment program. I don't even know if that's possible, but I think I read about that somewhere.

This is roughly how I thought it could work:
(using a GeForce 6800 GT)

Code:

_oFPBuffer.activate();

...

glActiveTexture(GL_TEXTURE2);

glEnable(GL_TEXTURE_2D);

glGenTextures(1, _iTexRead);

glBindTexture(GL_TEXTURE_2D, _iTexRead);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

...

glDrawBuffer(WGL_FRONT_LEFT_ARB);

glActiveTexture(GL_TEXTURE2);

glBindTexture(GL_TEXTURE_2D, _iTexRead);

if( !wglBindTexImageARB(&_oFPBuffer, WGL_BACK_LEFT_ARB) )

{ ... error ... }

glUniform1iARB(_iTexUnitDiagN1, 2);

...

glBegin(GL_QUADS);

{ ... }

glEnd();

glActiveTexture(GL_TEXTURE2);

wglReleaseTexImageARB(&_oFPBuffer, WGL_BACK_LEFT_ARB);

...

For the next pass I want to render into the buffer that I used for reading in this pass. Accordingly I want to read the buffer that has the results from the previous pass.

wglBindTexImageARB(...) always results (GetLastError()) in error code 3221684230 which is neither ERROR_INVALID_OPERATION, ERROR_INVALID_DATA, nor ERROR_INVALID_WINDOW_HANDLE.

I use the following attributes for my pbuffer:

Code:

int attribList[] = 

{

  WGL_SUPPORT_OPENGL_ARB,       true,

  WGL_RED_BITS_ARB,             32,

  WGL_GREEN_BITS_ARB,           32,

  WGL_BLUE_BITS_ARB,            32,

  WGL_ALPHA_BITS_ARB,           32,

  WGL_STENCIL_BITS_ARB,         8,

  WGL_DEPTH_BITS_ARB,           24,

  WGL_FLOAT_COMPONENTS_NV,      true,

  WGL_BIND_TO_TEXTURE_RGBA_ARB, true,

  WGL_DRAW_TO_PBUFFER_ARB,      true,

  WGL_DOUBLE_BUFFER_ARB,        true,

  WGL_AUX_BUFFERS_ARB,          true,

  0,

};

and the following pbuffer related extensions in my program:

Code:

"GL_NV_float_buffer " \

"WGL_ARB_pixel_format " \

"WGL_ARB_pbuffer " \

"WGL_ARB_render_texture " \

"WGL_ARB_extension_string "

Any idea how I can get this working?

Thanks a lot!

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #2

Feb 7, 2005 — 12:12 PM

apparently the aqua theme doesn't help at all, after all

TomorrowPlusX

Sage

Posts: 1,199
Joined: 2004.10

Post: #3

Feb 7, 2005 — 12:40 PM

OneSadCookie Wrote:apparently the aqua theme doesn't help at all, after all

You mean to scare away windows programmers? I was wondering about the aqua theme...

arekkusu

Sage

Posts: 1,231
Joined: 2002.10

Post: #4

Feb 7, 2005 — 02:28 PM

Maybe some day we'll all be using EXT_framebuffer_object, but for now the specifics of pixel formats and window/pbuffer drawables are highly OS-specific. So this question is better asked on the Windows OpenGL forum. iDevGames is Macintosh-centric.

habicht

Unregistered

Post: #5

Feb 7, 2005 — 05:33 PM

Ooops! Maybe I was already too tired yesterday... :-)

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PBuffer &amp; Render to Texture (read &amp; write)

PBuffer & Render to Texture (read & write)