return ptr;
}
}
+
+
+\f
+
+/* clear away any lingering error codes */
+void
+clear_gl_error (void)
+{
+ while (glGetError() != GL_NO_ERROR)
+ ;
+}
+
+/* report a GL error. */
+void
+check_gl_error (const char *type)
+{
+ char buf[100];
+ GLenum i;
+ const char *e;
+ switch ((i = glGetError())) {
+ case GL_NO_ERROR: return;
+ case GL_INVALID_ENUM: e = "invalid enum"; break;
+ case GL_INVALID_VALUE: e = "invalid value"; break;
+ case GL_INVALID_OPERATION: e = "invalid operation"; break;
+ case GL_STACK_OVERFLOW: e = "stack overflow"; break;
+ case GL_STACK_UNDERFLOW: e = "stack underflow"; break;
+ case GL_OUT_OF_MEMORY: e = "out of memory"; break;
+#ifdef GL_TABLE_TOO_LARGE_EXT
+ case GL_TABLE_TOO_LARGE_EXT: e = "table too large"; break;
+#endif
+#ifdef GL_TEXTURE_TOO_LARGE_EXT
+ case GL_TEXTURE_TOO_LARGE_EXT: e = "texture too large"; break;
+#endif
+ default:
+ e = buf; sprintf (buf, "unknown error %d", (int) i); break;
+ }
+ fprintf (stderr, "%s: %s error: %s\n", progname, type, e);
+ exit (1);
+}