Beyond3D Forum - 3D Technology & Algorithms

Customize mipmap generation with integer texture

Kien.T.N — Wed, 01 Sep 2010 03:16:21 GMT

Hello everyone,

I am having problem with customizing mipmap generation with integer format texture.
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA32UI_EXT, 512, 512, 0, GL_RGBA_INTEGER_EXT, GL_UNSIGNED_INT, NULL);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST );

I can customize mipmap generation with floating-point texture.
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, 512, 512, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

Here is the sample code from EXT_framebuffer_object document (Example #5)

Code:



glBindTexture(GL_TEXTURE_2D, 0);



glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);

glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,  GL_TEXTURE_2D, color_tex, 0);

glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depth_rb);



<1. draw to the base level of the color texture>



// custom-generate successive mipmap levels

glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, 0);

glBindTexture(GL_TEXTURE_2D, color_tex);

foreach (level > 0, in order of increasing values of level) 

{

        glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_2D, color_tex, level);

        glTexParameteri(TEXTURE_2D, TEXTURE_BASE_LEVEL, level-1);

        glTexParameteri(TEXTURE_2D, TEXTURE_MAX_LEVEL, level-1);



        <2. draw to level>

}

glTexParameteri(TEXTURE_2D, TEXTURE_BASE_LEVEL, 0);

glTexParameteri(TEXTURE_2D, TEXTURE_MAX_LEVEL, max);



glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);



<3. draw to the window, reading from the color texture>

The base level, step 1, is always rendered correctly. Instead of step 2, glGenerateMipmapEXT() is used.
Then at step 3 the whole texture levels can be viewed. It works but the content of each level is the same.
It seems that glGenerateMipmapEXT does nothing except copying data from base level to the others in case of integer format texture.
If I enable step 2 to manually draw each level then the texture becomes blank even the base level.

Does anybody know this problem?

Any help is highly appreciated,

Thanks

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Does the Dolby 3d format have any sort of advantage/disadvantage when it comes to rendering stereoscopic graphics?

Hustle Kings Lighting

MarkVF — Fri, 27 Aug 2010 08:25:23 GMT

Just posted another article about the rendering tech in Hustle Kings, this time explaining how we do the lighting. For those that are interested, the link is here...

http://www.voofoostudios.com/?p=156

Cheers,
Mark

TessMark -- New OpenGL 4 tessellation benchmark

fellix — Thu, 19 Aug 2010 15:52:35 GMT

Quote:

Now that DX11-class graphics cards, like Radeon HD 5000 series or GeForce GTX 400 series, are more and more popular, it was time to release a new benchmark for these modern cards. This new GPU tool, called TessMark, is small synthetic graphics benchmark focused on one of the killer features of Direct3D 11 and OpenGL 4 capable cards, I mean the GPU tessellation.

More info and Download

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CNCAddict — Mon, 16 Aug 2010 22:12:11 GMT

This looks like a breakthrough technology. Check out the video at the bottom of the link, it speaks for itself.

http://cgcad.thss.tsinghua.edu.cn/in...hoton-tracing/

Rendering pool balls in Hustle Kings

MarkVF — Mon, 16 Aug 2010 17:46:34 GMT

Hey, for anyone that's interested, I've recently posted an article providing a brief overview of how I render the shiny pool balls in Hustle Kings. Here's the link:-

http://www.voofoostudios.com/?p=33

Expect more postings about some of the Hustle Kings tech to follow shortly...

Cheers,
Mark

Image Processing on The GPU Forum

Drazick — Mon, 09 Aug 2010 19:13:05 GMT

Hello.
I would like to learn about Image Processing / Video Processing in the GPU.

Is there a forum (Not on Beyond3D obviously) dedicated for implementing Image Processing algorithms on the GPU (Cg, CUDA, Open CL etc...).
For example Bilateral Filter, Face Recognition, Skin Segmentation etc...

Could you recommend me places to make the first steps?

Thanks.

Can 18 x 18 Multiplier blocks be used as texture mapping units in a FPGA?

Flux — Mon, 09 Aug 2010 16:34:39 GMT

Can you use multiplier blocks like the ones used in the Spartan-3E or IV to map textures to a 3d model?

About over-shade

zhugel_007 — Wed, 04 Aug 2010 18:50:42 GMT

Hi,

As I understand, with MSAA off, the fragment shader will shade 2x2 pixels quad at one time. So even a triangle only touches one pixel of the 2x2 pixel quad, the other 3 unused pixels will still be shaded, and those 3 useless pixels will be discarded in the ROP stage. And this is one of the reasons that pixel size triangle is bad for performance.

But i couldn't find any official document to prove my thoughts. Am I wrong or do I miss anything?

Thanks in advance! :)