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|
/*
* Fonction
* ~~~~~~~~
* Gestion des extensions sous OpenGL
*
*
* Attention:
* ~~~~~~~~~~~
* Ce package a ete teste sur SGI, OSF, SUN, HP et WNT.
*
* Remarques:
* ~~~~~~~~~~~
* Le InitExtensionGLX permet d'initialiser le display. Ceci est necessaire
* pour travailler sur les extensions de GLX. On ne peut appeler QueryExtensionGLX
* si on n'a pas fait cette manip.
* Par contre QueryExtension gere les extensions a GL, on n'a pas besoin du
* Display.
*
* Pour l'instant on ne gere pas les extensions a GLU et a WGL.
*
* Historique des modifications
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* 14-10-97: FMN ; creation
* 23-10-97: FMN ; ajout gestion glx
* 04-11-97: FMN ; Gestion des differentes versions GLX
* 19-11-97: FMN ; Ajout GetCurrentDisplay
* 04-12-97: FMN ; Ajout supportsOneDotOne
* 22-07-98: FMN ; InitExtensionGLX n'est execute qu'une fois
* 28-07-98: FMN ; Renomme theDisplay en mytheDisplay
*/
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/*
* Includes
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <OpenGl_Extension.hxx>
#define XDEBUG
/*----------------------------------------------------------------------*/
/*
* Types definis
*/
/*----------------------------------------------------------------------*/
/*
* Variables statiques
*/
static Display *mytheDisplay = NULL;
static int screen_num;
static int GLXmajor, GLXminor;
static int GLmajor, GLminor;
static GLboolean flag_InitExtensionGLX = GL_FALSE;
static GLboolean OneDotOne = GL_FALSE;
static GLboolean initOneDotOne = GL_FALSE;
/*----------------------------------------------------------------------*/
/*
* Fonctions publiques
*/
/*----------------------------------------------------------------------*/
extern GLboolean CheckExtension(const char *extName, const char *extString)
{
/*
** Search for extName in the extensions string. Use of strstr()
** is not sufficient because extension names can be prefixes of
** other extension names. Could use strtok() but the constant
** string returned by glGetString can be in read-only memory.
*/
char *p = (char *)extString;
char *end;
int extNameLen;
extNameLen = strlen(extName);
end = p + strlen(p);
while (p < end) {
int n = strcspn(p, " ");
if ((extNameLen == n) && (strncmp(extName, p, n) == 0)) {
return GL_TRUE;
}
p += (n + 1);
}
return GL_FALSE;
}
extern GLboolean InitExtensionGLX(Display *display)
{
#ifndef WNT
int dontcare; /* for returned arguments we don't care about */
if (display == NULL) return GL_FALSE;
if (!flag_InitExtensionGLX)
{
/* does the server know about OpenGL & GLX? */
if(!XQueryExtension(display, "GLX", &dontcare, &dontcare, &dontcare)) {
#ifdef DEBUG
fprintf(stderr,"This system doesn't appear to support OpenGL\n");
#endif /* DEBUG */
return GL_FALSE;
}
/* find the glx version */
if(glXQueryVersion(display, &GLXmajor, &GLXminor)) {
#ifdef DEBUG
printf("GLX Version: %d.%d\n", GLXmajor, GLXminor);
#endif /* DEBUG */
} else {
#ifdef DEBUG
fprintf(stderr, "Error: glXQueryVersion() failed.\n");
#endif /* DEBUG */
return GL_FALSE;
}
/* get screen number */
screen_num = DefaultScreen(display);
flag_InitExtensionGLX = GL_TRUE;
mytheDisplay = display;
} /* (!flag_InitExtensionGLX) */
return GL_TRUE;
#else
return GL_FALSE;
#endif /* WNT */
}
/*----------------------------------------------------------------------*/
extern GLboolean QueryExtensionGLX(const char *extName)
{
GLboolean result = GL_FALSE;
#ifdef GLX_VERSION_1_1
if (flag_InitExtensionGLX)
{
if ( GLXminor > 1 || GLXmajor > 1 ) /* GLX_VERSION_1_2 */
{
/* Certaines extensions sont par defaut dans la version 1.2 */
if (strcmp(extName,"GLX_EXT_import_context")) return GL_TRUE;
result = CheckExtension(extName, glXQueryExtensionsString(mytheDisplay, screen_num));
}
else if( GLXminor > 0 || GLXmajor > 1 ) /* GLX_VERSION_1_1 */
{
result = CheckExtension(extName, glXQueryExtensionsString(mytheDisplay, screen_num));
}
}
#endif
#ifdef DEBUG
printf("QueryExtensionGLX: %s %d", extName, result);
#endif
return result;
}
/*----------------------------------------------------------------------*/
extern Display *GetCurrentDisplay(void)
{
#ifdef DEBUG
printf("GetCurrentDisplay %x \n", mytheDisplay);
#endif
return mytheDisplay;
}
/*----------------------------------------------------------------------*/
extern GLboolean QueryExtension(const char *extName)
{
GLboolean result = GL_FALSE;
if (supportsOneDotOne()) /* GL_VERSION_1_1 ou more */
{
/* Certaines extensions sont par defaut dans la version 1.1 */
/* Certain extensions are the defaut in version 1.1 */
if ((strcmp(extName,"GL_EXT_vertex_array")) ||
(strcmp(extName,"GL_EXT_polygon_offset")) ||
(strcmp(extName,"GL_EXT_blend_logic_op")) ||
(strcmp(extName,"GL_EXT_texture")) ||
(strcmp(extName,"GL_EXT_copy_texture")) ||
(strcmp(extName,"GL_EXT_subtexture")) ||
(strcmp(extName,"GL_EXT_texture_object")))
result = GL_TRUE;
else
result = CheckExtension(extName, (char *)glGetString(GL_EXTENSIONS));
}
else /* GL_VERSION_1_0 */
{
result = CheckExtension(extName, (char *)glGetString(GL_EXTENSIONS));
}
#ifdef DEBUG
printf("QueryExtension: %s %d \n", extName, result);
#endif
return result;
}
/*----------------------------------------------------------------------*/
extern GLboolean supportsOneDotOne(void)
{
const GLubyte *version;
if (!initOneDotOne)
{
version = glGetString(GL_VERSION);
if(sscanf((const char *)version, "%d.%d", &GLmajor, &GLminor) == 2)
{
OneDotOne = (GLmajor>=1 && GLminor >=1);
}
initOneDotOne = GL_TRUE;
}
#ifdef DEBUG
printf("GL Version: %d.%d\n", GLmajor, GLminor);
#endif /* DEBUG */
return OneDotOne;
}
/*----------------------------------------------------------------------*/
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