Using glTexCoordPointer with multitexturing

Sage

Posts: 1,199
Joined: 2004.10

Post: #1

Dec 4, 2006 — 06:29 AM

I'm reading the man page right now, but I'm not certain how to approach this. I'm moving from using display lists to VBOs, and I use multitexturing all over the place. I need to be able to submit texture coordinates for GL_TEXTURE0, GL_TEXTURE1, etc.

In immediate mode ( or stored in a display list ) it's easy enough to use glMultiTexCoord( GL_TEXTURE{N} )... but I can't see how to do this with vertex arrays.

Any suggestions? Thanks,

TomorrowPlusX

Sage

Posts: 1,199
Joined: 2004.10

Post: #2

Dec 4, 2006 — 06:30 AM

OK, I'm an idiot. A well-formed google search got me the answer.

http://berkelium.com/OpenGL/GDC99/multitexture.html

From the page:

Code:

glClientActiveTextureARB(GL_TEXTURE0_ARB); 

glTexCoordPointer(2, GL_FLOAT, 0, tp0); 

glEnableClientState(GL_TEXTURE_COORD_ARRAY); 

glClientActiveTextureARB(GL_TEXTURE1_ARB); 

glTexCoordPointer(2, GL_FLOAT, 0, tp1); 

glEnableClientState(GL_TEXTURE_COORD_ARRAY);

Sorry for the noise.

NYGhost

Member

Posts: 157
Joined: 2002.12

Post: #3

Dec 4, 2006 — 11:44 AM

texture coords generation is not affected by the use of VBO's.
a VBO is nothing more than a buffer in gpu memory as I understand it so if you are using vertex arrays it should be very easy to move yo VBO's.

this is how I do mine

Code:

glGenBuffersARB(1, &id);

        if(id) {

            glBindBuffer(GL_ARRAY_BUFFER, id);

            glBufferData(GL_ARRAY_BUFFER, bytesize, vertexptr, GL_STATIC_DRAW );

        } else printf("fail to load mesh to GPU as Vertex Buffer Object\n");

this is how I do vertex arrays

Code:

glGenVertexArraysAPPLE(1, &id);

if(id) {

glEnableClientState(GL_VERTEX_ARRAY_RANGE_APPLE);

            glBindVertexArrayAPPLE(id);

            glVertexArrayRangeAPPLE(bytesize, vertexptr);

            glVertexArrayParameteriAPPLE(GL_VERTEX_ARRAY_STORAGE_HINT_APPLE,GL_STORAGE_​SHARED_APPLE);

            glFlushVertexArrayRangeAPPLE(bytesize, vertexptr);

} else else printf("fail to load mesh to GPU as Vertex Array\n");

TomorrowPlusX

Sage

Posts: 1,199
Joined: 2004.10

Post: #4

Dec 4, 2006 — 02:17 PM

I've used both vertex arrays and VBOs plenty! I use them for foliage on my terrain, for shadow volume extrusion, etc etc.

I'd just never used vertex arrays or VBOs with multitexturing. I couldn't find in the man pages how to bind one array for GL_TEXTURE0 and another for GL_TEXTURE1 and so on.

But google helped.

Thanks,

NYGhost

Member

Posts: 157
Joined: 2002.12

Post: #5

Dec 4, 2006 — 03:29 PM

I use this tutorial to learn about it.
http://nehe.gamedev.net/data/lessons/les...?lesson=22

OneSadCookie

Luminary

Posts: 5,131
Joined: 2002.04

Post: #6

Dec 4, 2006 — 05:22 PM

That tutorial doesn't use multiple texture coordinates simultaneously with vertex arrays...

I think you need to go back and *read* what TomorrowPlusX wrote, before saying random things.

NYGhost

Member

Posts: 157
Joined: 2002.12

Post: #7

Dec 5, 2006 — 09:42 AM

-- you're right OneSadCookie, I apologyze

this one does use them
http://www.kraftwrk.com/multi_texturing.htm

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