Multitexure Issues

[dabeav]

Here is my code, (you can ignore the IL calls, I am using OpenIL to load my images).
Else where in the code I check for the use availability of the Multitexture, and CVA extensions. Then I set the flags, to true if its supported.

if(MultiTextureSupport == true && CompiledVertexArraySupport == true)
{
ilGenImages(1, &MapImage);
ilBindImage(MapImage);
ilLoadImage(MapTextureName);
glActiveTextureARB(GL_TEXTURE0_ARB);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(3, GL_FLOAT, 0,&Map.Texture1PT);
ilutGLBindMipmaps();
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glColor4f(1,1,1,1);
ilDeleteImages(1, &MapImage);

ilGenImages(1, &MapLightImage);
ilBindImage(MapLightImage);
ilLoadImage(MapLightTextureName);
glActiveTextureARB(GL_TEXTURE1_ARB);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(3, GL_FLOAT, 0, &Map.Texture2PT);
ilutGLBindMipmaps();
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glColor4f(1,1,1,1);
ilDeleteImages(1, &MapLightImage);

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, &Map.VertPT);
glNormalPointer(GL_FLOAT, 0, &Map.NormalPT);

glLockArraysEXT(0, Map.NumInterleavedVerts);
glDrawElements(GL_TRIANGLES, 0, GL_UNSIGNED_INT, &Map.VertIndexPT);
glUnlockArraysEXT();
}

Why do I get these errors when I compile??

'int (__stdcall *)(void)' : too many actual parameters

I get this error 3 times, once for the lines containing my first glActiveTextureARB, my second glActiveTextureARB, and my glLockArraysEXT. Any ideas why this is happening? I have tried everything to get it to work, and still nothing.??.. Please help..

[Michael Steinberg]

Please post the declaration of those function pointers here. You seem to have declared the functions improperly, or you are using them incorrectly.

[dabeav]

Here is all the code dealing with the declaration, and use of the extensions.

#include <windows.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <IL/il.h>
#include <IL/ilu.h>
#include <IL/ilut.h>
#include <math.h>
#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>

PROC glLockArraysEXT = NULL;
PROC glUnlockArraysEXT = NULL;

PROC glActiveTextureARB = NULL;
PROC glMultiTexCoord2fARB = NULL;

void CheckExtensions(void)
{
glGetString(GL_EXTENSIONS);

if(strstr((const char *)glGetString(GL_EXTENSIONS), "ARB_multitexture") != NULL)
{
glActiveTextureARB = wglGetProcAddress("glActiveTextureARB");
glMultiTexCoord2fARB = wglGetProcAddress("glMultiTexCoord2fARB");
MultiTextureSupport = true;
}

else
{
MultiTextureSupport = false;
}

if(strstr((const char *)glGetString(GL_EXTENSIONS), "EXT_compiled_vertex_array") != NULL)
{
glLockArraysEXT = wglGetProcAddress("glLockArraysEXT");
glUnlockArraysEXT = wglGetProcAddress("glUnlockArraysEXT");
CompiledVertexArraySupport = true;
}

else
{
CompiledVertexArraySupport = false;
}
}

I first attempted using that PROCGLLOCKARRAYEXT, or something like that, i know thats not it, but its something similar, but that wouldnt compile either. I went to the extension registration page, and got the most current headers, is there something im doing wrong here? Also, how would i get the above to work with Linux, and mac ( if possible? )..

[kehziah]

your problem is the PROC function pointer type. It is likely to be a generic function pointer type, ie a pointer to a function that has no parameters and that returns an int.

You need to specify a correct type for each function to reflect its return value and parameters.

For CVA :
typedef void (APIENTRY * PFNGLLOCKARRAYSEXTPROC) (GLint first, GLsizei count);
typedef void (APIENTRY * PFNGLUNLOCKARRAYSEXTPROC) (void);
PFNGLLOCKARRAYSEXTPROC glLockArraysEXT = NULL;
PFNGLUNLOCKARRAYSEXTPROC glUnlockArraysEXT = NULL;

As for portability, no your code won't work for Linux/Mac. It is due to the use of wgl. Under Linux, you have to use glx routines instead to get function pointers (don't know about the Mac situation).

[mproso]

You have to include glext.h from http://oss.sgi.com/projects/ogl-sample/registry/
and you dont have to write extension functions prototypes(they are allready in glext.h).
I dont see in your code that you included glext.h. You only need to write function pointers declarations.
Hope this helps.

[dabeav]

Thanks guys, worked like a charm, first time i tried the PFNGLLOCKARRAYSEXTPROC i never included the glext.h header, so i thought it was a syntax error. So i tried the Proc stuff, that didnt work. But now it works, so i thank you. anyone know what the linux, and mac version of wglGetProcAddress is?? I believe this is my only piece of windows code that must be used. So i am looking for the linux and mac equivilant so i can write OPEN code. Thanks for all your help.

[This message has been edited by dabeav (edited 05-25-2002).]

[mproso]

On Linux and every OS that uses XWindows it is glXGetProcAddressARB(it is extesion of GLX), on a Mac it is aglGetProcAddress but I'm not 100% sure.
Check docs for both versions of function.
Hope this helps.