OpenGL multiple textures same surface, problem

OpenGL OpenGL: Advanced Coding
1

Hello I’m trying to get multiple textures on the same big multi-polygon surface in openGL. to do this I use the glActiveTextureARB and glClientActiveTextureARB to set the texture (just 2 different textures I use, texture and focusedTexture), and set their correct coordinates and enable everything. After I set these up I call a lot of glDrawElements() to draw a surface.

However, the surface only has the LATTER texture that was enabled!

//excerpt of code

        glActiveTextureARB(GL_TEXTURE0_ARB);
        glEnable(GL_TEXTURE_2D);
        glBindTexture(GL_TEXTURE_2D, texture);

        glClientActiveTextureARB(GL_TEXTURE0_ARB);
        glEnableClientState(GL_TEXTURE_COORD_ARRAY);    
        glTexCoordPointer(2, GL_FLOAT, 0, texCoords);


        glActiveTextureARB(GL_TEXTURE1_ARB);
        glEnable(GL_TEXTURE_2D);
        glBindTexture(GL_TEXTURE_2D, focusedTexture);

        glClientActiveTextureARB(GL_TEXTURE1_ARB);
        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
        glTexCoordPointer(2, GL_FLOAT, 0, focusedTexCoords);

then I call

//excerpt of code
glBindBufferARB(GL_ARRAY_BUFFER_ARB, cVboId);
glColorPointer(3, GL_FLOAT, 0, 0);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, nVboId);
glNormalPointer(GL_FLOAT, 0, 0);

then I have a for loop that calls a lot of times: glDrawElements(GL_QUAD_STRIP, 2*maxXres, GL_UNSIGNED_INT, quadIndices[i5]);

I even made a hotkey for debugging that switches between three states: case 1 tries to render both, case 2 tries to render texture only, case 3 tries to render focusedTexture only. Cases 2 and 3 both work but Case 1 only does whatever texture is enabled last (in this instance, focusedTexture). Help please.

edit: i also tried changing the modes of the GL_TEXTURE_ENV to GL_INCR or GL_ADD or GL_MODULATE to make sure it’s not just hidden behind the other texture, and still it doesn’t show up.

2

Those function calls are only part of the whole picture.
If you are using glTexEnv, here are examples:
http://www.opengl.org/wiki/Texture_Combiners

If you want a debugger,
http://www.opengl.org/wiki/Debugging_Tools

As for your half VBO and half non-VBO code, I don’t know if that works.

Also, I strongly recommend that you download some code. There are a lot of multitexturing examples out there (really old examples):
http://www.lighthouse3d.com/tutorials/glsl-tutorial/multi-texture/

http://www.informit.com/articles/article.aspx?p=770639&seqNum=5

http://nehe.gamedev.net/lesson.asp?index=05
http://www.gamedev.net/topic/55191-gl_arb_multitexture-extension/

3

I already tried the default glTexEnv settings recommended by all the tutorials I read including replace and/or modulate etc. I’ll try those out when I get back to work but I seriously doubt they will change anything.

ok maybe

It works. Before I started doing multi-texturing I was already doing colors and vertices with VBO and texture non-vbo

I have already looked at half of these but I guess I’ll give it a shot, though I think they all contain basically the same tutorial