#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+
+#include <fcntl.h>
void *libgl_handle;
void *wrapper_handle;
+#define STRNCMP_LITERAL(str, literal) strncmp (str, literal, sizeof (literal) - 1)
+
static void
open_libgl_handle (void)
{
- const char *path;
+ const char *libgl_path;
if (libgl_handle)
return;
- path = getenv ("GLAZE_LIBGL");
- if (path == NULL) {
- fprintf (stderr, "GLAZE_LIBGL unset. Please set to path of real libGL.so under glaze.\n");
- exit (1);
+ libgl_path = getenv ("GLAZE_LIBGL");
+
+ if (libgl_path == NULL) {
+
+#if GLAZE_BITS == 32
+ libgl_path = getenv ("GLAZE_LIBGL_32_AUTO");
+#elif GLAZE_BITS == 64
+ libgl_path = getenv ("GLAZE_LIBGL_64_AUTO");
+#endif
+
+ if (libgl_path == NULL) {
+ fprintf (stderr,
+ "Error: Failed to detect OpenGL library.\n"
+ "Please set GLAZE_LIBGL to path of real libGL.so\n");
+ exit (1);
+ }
+
+ setenv ("GLAZE_LIBGL", libgl_path, 1);
}
- libgl_handle = dlopen (path, RTLD_LAZY | RTLD_GLOBAL);
+ dlerror();
+ libgl_handle = dlopen (libgl_path, RTLD_LAZY | RTLD_GLOBAL);
if (libgl_handle == NULL) {
- fprintf (stderr, "Error: Failed to dlopen %s\n", path);
+ fprintf (stderr, "glaze_init: Error: Failed to dlopen %s: %s\n",
+ libgl_path, dlerror());
exit (1);
}
}
static void *
resolve (const char *name)
{
+ static int before_first_gl_call = 1;
void *symbol;
+ if (before_first_gl_call &&
+ STRNCMP_LITERAL (name, "gl") == 0 &&
+ STRNCMP_LITERAL (name, "glX") != 0)
+ {
+ char *callback_name = getenv ("GLAZE_FIRST_GL_CALL_CALLBACK");
+ if (callback_name) {
+ void (*callback) (void) = dlsym (wrapper_handle,
+ callback_name);
+ if (callback) {
+ (callback) ();
+ } else {
+ fprintf (stderr,
+ "Error: Failed to find function %s "
+ "in GLAZE_WRAPPER library.\n",
+ callback_name);
+ }
+ }
+ before_first_gl_call = 0;
+ }
+
/* The wrapper gets first choice on all symbols. */
symbol = dlsym (wrapper_handle, name);
if (symbol)