iPhone multitexturing and lightmaping

Apprentice

Posts: 11
Joined: 2010.07

Post: #1

Aug 9, 2010 — 09:21 AM

Hey guys I am trying to do some simple lightmapping with static geometry but it does not seem to be multiplying the 2 textures. Here is my binding code

Code:

    glActiveTexture(GL_TEXTURE0);

    [lightmap bindTexture];

    glActiveTexture(GL_TEXTURE1);

    [texture bindTexture];

    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);

    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);   

    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_PREVIOUS);

    glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_TEXTURE);

    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);

    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);

    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);  

    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, GL_PREVIOUS);

    glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);

    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);

    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);

and I also use this for texture coords on the static geometry

Code:

    glClientActiveTexture(GL_TEXTURE1);

    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

    glTexCoordPointer(textureCoords,...);

    glClientActiveTexture(GL_TEXTURE0);

    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

    glTexCoordPointer(textureCoords,...);

anybody know what I am doing wrong?

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #2

Aug 9, 2010 — 11:10 AM

You're not setting COMBINE_RGB, is it already set to what you want?

narpas

Apprentice

Posts: 11
Joined: 2010.07

Post: #3

Aug 9, 2010 — 12:44 PM

(Aug 9, 2010 11:10 AM)OneSadCookie Wrote: You're not setting COMBINE_RGB, is it already set to what you want?

Woops sorry I was in my code but not the post I fixed the post to show it.

Bachus

Member

Posts: 268
Joined: 2005.04

Post: #4

Aug 9, 2010 — 05:11 PM

(Aug 9, 2010 12:44 PM)narpas Wrote:
(Aug 9, 2010 11:10 AM)OneSadCookie Wrote: You're not setting COMBINE_RGB, is it already set to what you want?

Woops sorry I was in my code but not the post I fixed the post to show it.

Does the lightmap just not show up? Only the lightmap show up? The texture combiners look okay, but it's hard to tell without knowing exactly what the problem is. Post a screenshot.

The default texture combiner settings should actually work fine for lightmaps.

Code:

glEnableClientState(GL_VERTEX_ARRAY);

glVertexPointer(3, GL_FLOAT, 0, &vertices[0]);

glActiveTexture(GL_TEXTURE1);

glClientActiveTexture(GL_TEXTURE1);

glEnable(GL_TEXTURE_2D);

glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glBindTexture(GL_TEXTURE_2D, lightmapTex);

glTexCoordPointer(2, GL_FLOAT, 0, &texCoords2[0]);

glActiveTexture(GL_TEXTURE0);

glClientActiveTexture(GL_TEXTURE0);

glEnable(GL_TEXTURE_2D);

glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glBindTexture(GL_TEXTURE_2D, diffuseTex);

glTexCoordPointer(2, GL_FLOAT, 0, &texCoords[0]);

glDrawArrays(GL_TRIANGLES, 0, numIndices);

glActiveTexture(GL_TEXTURE1);

glDisable(GL_TEXTURE_2D);

glActiveTexture(GL_TEXTURE0);

Killer Robots - Twitter - Illuminations and Ladybug Dreams

narpas

Apprentice

Posts: 11
Joined: 2010.07

Post: #5

Aug 9, 2010 — 05:50 PM

Thanks for the help everyone I figured it out.
I needed to enable texture 2d when I set the active texture to 0 and when I set it to 1. like so

Code:

    glActiveTexture(GL_TEXTURE0);

    glEnable(GL_TEXTURE_2D);

    [lightmap bindTexture];

    glActiveTexture(GL_TEXTURE1);

    glEnable(GL_TEXTURE_2D);

    [texture bindTexture];