[SOLVED] -- well, kind of. I am using a pbo to stream the black, luckily i can record which portions of the image are already filled, so i have to streeam only a few pixels the 'black' via...

@dukey: no, the texture comes from a pool to keep gpu memory footprint low

actually no, it is a single texture bound to the fbo, its size is 1024x1024 and it is quite standard RGBA / UNSIGNED_BYTE, so nothing special there.

i thought this approach is totally on the GPU...

i have put the code in a display list. now it looks a little bit better, performance wise. still wondering - is there some software fallback here?

Hi,

i want to clear a texture. It comes from a pool, and it may have some previous image content. I tried to do this hardware side using FBOs, but to my surprise this turned out very cpu intensive...

Nothing special

- core i7
- gtx 285
- two gl windows XGA size
- single threaded
- one context alternatively bound to windows
- paint command every 40ms

Hi all,

i have the following problem: when my opengl application is under full load, and i try to open a dialog in the same application, the dialog opens extremely slowly.

this problem does...

yes, and i am always checking link success - and the shader compiled fine but did not load. ( really strange... )

perfect! thank you! and i had to use texture2DRect, too.
It is always dangerous to develop under windows and then switch to macos ..

Hi all,

when i try to load this shader, i get "invalid operation"

const GLchar* source =
"
uniform samplerRect TSAMP0;
uniform sampler2D TSAMP1;
void main(void)
{

hi, it works like a charm!

this is the shader i load before i draw the object:



if(!glIsProgram(bitmask_shader))
{
const GLchar* source =
"\

you mean
- apply shader that writes tex coord
- render into 1x1 pixel viewport at cursor location
- read pixel
- restore texture coordinate
- alter texture at position

OMG - thats cool!
...

Hi all,

i want to draw on a textured object. The object should
be a textured polygon, and i would like to alter
( and then read back ) the applied texture. Like eg. drawing
a face on a sphere...

... indeed ...

i am using 10.6.6 on a MacBookPro 6,2 NVIDIA GeForce GT 330M

Hi all,

i am writing a shader that does a sort-of-lightwriting.
It writes to two render targets, one being the output,
the other being a difference image for future lookups.
The shader runs...

Hi all,

i am developing under Linux ubuntu 2.6.32-22-generic x86_64
and this call sequence fails:

// get read buffer and reset it
GLint m_currentReadbuf = 0;
glGetIntegerv(GL_READ_BUFFER,...

Hi,

thank you all for your answers!
Yes, i want to display on monitors ( projectors ), so there is visible tearing. I heard about the context/thread solution, but i am sad to hear it does not...

Hi all,

i have a question about swapping buffers in sync with vertical
retrace to avoid tearing.

Situation is: i have multiple opengl windows on the same
( virtual ) monitor. I do this...

i got some information that the WGL_NV_copy_image extension is only supported on quadro cards.

anyway i never got any decent doc about this
multi/single/performance/compatibility modes
in nvidia...

Yes, i think this is the case, too.
I am interested
in the wglCopyImageSubDataNV function call since it
should be able to copy data across contexts.

But just to be sure: i do not have to make...

Hi,

a am very interested in the scalablity of equalizer.
but my application is mostly limited to video upload
capabilites: he performance bottleneck by now is to
upload a lot of video data (...

Hi all,

i have NV Driver 191.07 istalled,
( XP 32, 1x NV8800GTX, 1x6200 TurboCache )

and
wglGetProcdress("wglCopyImageSubDataNV") fails
wglGetProcdress("glCopyImageSubDataNV") works

the...

Hi,

i am looking for a wya to query
the currently used vram.
It is possible ot query the total
vram using kIOFBMemorySizeKey, but
is there any way to get the actual
used/free vram? ( Like...

yes,

done here:
http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=257084#Post257084

Anyway, thnks ...

Hi all,

sorry for asking this way, but the behaviour
is really puzzling across drivers / machines.

They only have one thing in common: it does
not work. So i am asking for some success...