GL_ATIX_envmap_bumpmap question

OpenGL OpenGL: Advanced Coding
1

Hi,

I’ve lost a bit in specs. It this sequence:

glTexEnvi (GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE_EXT);
glTexEnvi (GL_TEXTURE_ENV,GL_COMBINE_RGB_EXT,GL_BUMP_ENVMAP_ATIX);
glTexEnvi(GL_TEXTURE_ENV,GL_BUMP_TARGET_ATIX,GL_TEXTURE1_ARB);

is all that I need to do to turn on bumpmap for tex.unit 2 (i assume that I’ve already binded textures and enabled texturing on units 1 & 2, current unit is 1)? Is any special setup for EXT_texture_env_combine required to make ATIX_bump_envmap work?

[This message has been edited by h2 (edited 05-13-2001).]

2

What exactly does that extension do?

3

It’s an EMBM extension.

Some cut’n’paste code from my EMBM demo:

glActiveTexture(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
envMap->setCurrent();

glActiveTexture(GL_TEXTURE2_ARB);
glEnable(GL_TEXTURE_2D);
bumpMap->setCurrent();

glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_BUMP_ENVMAP_ATIX);
glTexEnvi(GL_TEXTURE_ENV, GL_BUMP_TARGET_ATIX, GL_TEXTURE0_ARB);

float rotMatrix[4];

rotMatrix[0] = 0.01f;
rotMatrix[1] = 0;
rotMatrix[2] = 0;
rotMatrix[3] = 0.01f;

glTexBumpParameterfvATIX(GL_BUMP_ROT_MATRIX_ATIX, (float *) &rotMatrix);

4

Humus,

Thanks.

5

Originally posted by h2:
[b]Hi,

I’ve lost a bit in specs. It this sequence:

glTexEnvi (GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE_EXT);
glTexEnvi (GL_TEXTURE_ENV,GL_COMBINE_RGB_EXT,GL_BUMP_ENVMAP_ATIX);
glTexEnvi(GL_TEXTURE_ENV,GL_BUMP_TARGET_ATIX,GL_TEXTURE1_ARB);

is all that I need to do to turn on bumpmap for tex.unit 2 (i assume that I’ve already binded textures and enabled texturing on units 1 & 2, current unit is 1)? Is any special setup for EXT_texture_env_combine required to make ATIX_bump_envmap work?

[This message has been edited by h2 (edited 05-13-2001).][/b]

just a side note: make sure that the DUDV offset texture always lives in tex unit 2.

6

chrisATI,

You mean GL_TEXTURE2_ARB or 2nd tex.unit (aka GL_TEXTURE1_ARB)?

It seems that GL_BUMP_TEX_UNITS_ATIX returns non-zero value (something like 32245) only for GL_TEXTURE0_ARB. I wonder why.

7

The Radeon only supports bumpmaps on the third texturing unit (GL_TEXTURE2_ARB).

8

Originally posted by h2:
[b]chrisATI,

You mean GL_TEXTURE2_ARB or 2nd tex.unit (aka GL_TEXTURE1_ARB)?

It seems that GL_BUMP_TEX_UNITS_ATIX returns non-zero value (something like 32245) only for GL_TEXTURE0_ARB. I wonder why.[/b]

DUDV offset map must live on GL_TEXTURE2_ARB

–chris

9

btw … the extension provides an interface for querying which texture units supports DUDV maps.