X-Git-Url: https://git.cworth.org/git?p=glaze;a=blobdiff_plain;f=glaze.c;h=02a39275d0b3ba50101988e2386b7e499ecf8c88;hp=5ad3af33a59301cb6e4da0857948fd3e49962624;hb=HEAD;hpb=75d3372ac4784383f6cdc8b5260098f81f8b2751

diff --git a/glaze.c b/glaze.c
index 5ad3af3..02a3927 100644
--- a/glaze.c
+++ b/glaze.c
@@ -19,53 +19,76 @@
  * THE SOFTWARE.
  */
 
-#define _GNU_SOURCE
-#include <dlfcn.h>
-
 #include <stdio.h>
 #include <stdlib.h>
+#include <getopt.h>
+#include <limits.h>
 
-void *libgl_handle;
+#include <glaze.h>
 
 static void
-open_libgl_handle (void)
+usage (void)
 {
-	const char *path;
+	printf ("Usage: glaze --wrapper=<wrapper> <program> [program args...]\n"
+		"\n"
+		"Execute <program> with <wrapper> providing alternate OpenGL functions.\n");
+}
 
-	if (libgl_handle)
-		return;
+enum {
+	WRAPPER_OPT = CHAR_MAX + 1
+};
 
-	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);
+int
+main (int argc, char *argv[])
+{
+	const char *wrapper = NULL;
+	int opt;
+
+	/* The initial '+' means that getopt will stop looking for
+	 * options after the first non-option argument. This means
+	 * that a command such as:
+	 *
+	 *	glaze glenv --renderer=Foo glxgears
+	 *
+	 * Will do what is intended, (namely, have glaze invoke "glenv
+	 * --renderer=Foo glxgears" rather than trying to interpret
+	 * --renderer=Foo as an option to glaze itself.
+	 */
+	const char *short_options="+h";
+	const struct option long_options[] = {
+		{"help", no_argument, 0, 'h'},
+		{"wrapper", required_argument, 0, WRAPPER_OPT},
+		{0, 0, 0, 0}
+	};
+
+	while (1)
+	{
+		opt = getopt_long (argc, argv, short_options, long_options, NULL);
+		if (opt == -1)
+			break;
+
+		switch (opt) {
+		case 'h':
+			usage ();
+			return 0;
+		case WRAPPER_OPT:
+			wrapper = optarg;
+			break;
+		default:
+			fprintf (stderr, "Internal error: "
+				 "unexpected getopt value: %d\n", opt);
+			exit (1);
+		}
 	}
 
-	libgl_handle = dlopen (path, RTLD_LAZY | RTLD_GLOBAL);
-	if (libgl_handle == NULL) {
-		fprintf (stderr, "Error: Failed to dlopen %s\n", path);
+	if (optind >= argc) {
+		fprintf (stderr, "Error: No program name provided, "
+			 "see (glaze --help)\n");
 		exit (1);
 	}
-}
 
-static void
-glaze_init (void) __attribute__((constructor));
-
-static void
-glaze_init (void)
-{
-	open_libgl_handle ();
-}
+	glaze_execute (argc - optind, &argv[optind], wrapper);
 
-static void *
-resolve (const char *name)
-{
-	return dlsym (libgl_handle, name);
+	/* If glaze_execute returns then something went wrong. */
+	return 1;
 }
-
-#define GLAZE_API(name)							\
-void * name() __attribute__((ifunc(#name "_resolver")));		\
-static void *								\
-name ## _resolver (void) { return resolve (#name); }
-
-#include "glapi.def"