add support for swap and sync extensions (Ian Romanick)
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Brian Paul
parent
4c928471c1
commit
ad80233d5d
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@ -23,9 +23,15 @@
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* This is a port of the infamous "gears" demo to straight GLX (i.e. no GLUT)
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* Port by Brian Paul 23 March 2001
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*
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* Command line options:
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* -info print GL implementation information
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* Modified by Ian Romanick <idr@us.ibm.com> 09 April 2003 to support
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* GLX_{MESA,SGI}_swap_control and GLX_OML_sync_control.
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*
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* Command line options:
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* -display Name of the display to use.
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* -info print GL implementation information
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* -swap N Attempt to set the swap interval to 1/N second
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* -forcegetrate Get the display refresh rate even if the required GLX
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* extension is not supported.
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*/
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@ -35,9 +41,20 @@
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#include <string.h>
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#include <X11/Xlib.h>
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#include <X11/keysym.h>
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#include <stdint.h>
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#define GLX_GLXEXT_PROTOTYPES
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#include <GL/gl.h>
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#include <GL/glx.h>
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#ifndef GLX_MESA_swap_control
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typedef GLint ( * PFNGLXSWAPINTERVALMESAPROC) (unsigned interval);
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typedef GLint ( * PFNGLXGETSWAPINTERVALMESAPROC) ( void );
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#endif
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#if !defined( GLX_OML_sync_control ) && defined( _STDINT_H )
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#define GLX_OML_sync_control 1
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typedef Bool ( * PFNGLXGETMSCRATEOMLPROC) (Display *dpy, GLXDrawable drawable, int32_t *numerator, int32_t *denominator);
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#endif
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#define BENCHMARK
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@ -48,6 +65,8 @@
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#include <sys/time.h>
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#include <unistd.h>
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#define NUL '\0'
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/* return current time (in seconds) */
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static int
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current_time(void)
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@ -84,6 +103,12 @@ static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
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static GLint gear1, gear2, gear3;
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static GLfloat angle = 0.0;
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static GLboolean has_OML_sync_control = GL_FALSE;
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static GLboolean has_SGI_swap_control = GL_FALSE;
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static GLboolean has_MESA_swap_control = GL_FALSE;
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static char ** extension_table = NULL;
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static unsigned num_extensions;
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/*
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*
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@ -452,6 +477,133 @@ event_loop(Display *dpy, Window win)
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}
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/**
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* Display the refresh rate of the display using the GLX_OML_sync_control
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* extension.
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*/
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static void
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show_refresh_rate( Display * dpy )
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{
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#ifdef GLX_OML_sync_control
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PFNGLXGETMSCRATEOMLPROC get_msc_rate;
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int32_t n;
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int32_t d;
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get_msc_rate = (PFNGLXGETMSCRATEOMLPROC) glXGetProcAddressARB( (const GLubyte *) "glXGetMscRateOML" );
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if ( get_msc_rate != NULL ) {
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(*get_msc_rate)( dpy, glXGetCurrentDrawable(), &n, &d );
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printf( "refresh rate: %.1fHz\n", (float) n / d );
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return;
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}
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#endif
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printf( "glXGetMscRateOML not supported.\n" );
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}
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/**
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* Fill in the table of extension strings from a supplied extensions string
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* (as returned by glXQueryExtensionsString).
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*
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* \param string String of GLX extensions.
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* \sa is_extension_supported
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*/
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static void
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make_extension_table( const char * string )
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{
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char ** string_tab;
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unsigned num_strings;
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unsigned base;
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unsigned idx;
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unsigned i;
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/* Count the number of spaces in the string. That gives a base-line
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* figure for the number of extension in the string.
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*/
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num_strings = 1;
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for ( i = 0 ; string[i] != NUL ; i++ ) {
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if ( string[i] == ' ' ) {
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num_strings++;
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}
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}
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string_tab = (char **) malloc( sizeof( char * ) * num_strings );
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if ( string_tab == NULL ) {
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return;
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}
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base = 0;
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idx = 0;
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while ( string[ base ] != NUL ) {
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/* Determine the length of the next extension string.
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*/
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for ( i = 0
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; (string[ base + i ] != NUL) && (string[ base + i ] != ' ')
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; i++ ) {
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/* empty */ ;
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}
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if ( i > 0 ) {
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/* If the string was non-zero length, add it to the table. We
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* can get zero length strings if there is a space at the end of
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* the string or if there are two (or more) spaces next to each
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* other in the string.
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*/
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string_tab[ idx ] = malloc( sizeof( char ) * (i + 1) );
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if ( string_tab[ idx ] == NULL ) {
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return;
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}
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(void) memcpy( string_tab[ idx ], & string[ base ], i );
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string_tab[ idx ][i] = NUL;
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idx++;
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}
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/* Skip to the start of the next extension string.
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*/
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for ( base += i
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; (string[ base ] == ' ') && (string[ base ] != NUL)
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; base++ ) {
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/* empty */ ;
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}
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}
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extension_table = string_tab;
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num_extensions = idx;
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}
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/**
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* Determine of an extension is supported. The extension string table
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* must have already be initialized by calling \c make_extension_table.
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*
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* \praram ext Extension to be tested.
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* \return GL_TRUE of the extension is supported, GL_FALSE otherwise.
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* \sa make_extension_table
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*/
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static GLboolean
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is_extension_supported( const char * ext )
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{
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unsigned i;
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for ( i = 0 ; i < num_extensions ; i++ ) {
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if ( strcmp( ext, extension_table[i] ) == 0 ) {
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return GL_TRUE;
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}
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}
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return GL_FALSE;
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}
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int
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main(int argc, char *argv[])
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{
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@ -459,17 +611,46 @@ main(int argc, char *argv[])
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Window win;
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GLXContext ctx;
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char *dpyName = ":0";
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int swap_interval = 1;
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GLboolean do_swap_interval = GL_FALSE;
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GLboolean force_get_rate = GL_FALSE;
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GLboolean printInfo = GL_FALSE;
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int i;
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PFNGLXSWAPINTERVALMESAPROC set_swap_interval = NULL;
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PFNGLXGETSWAPINTERVALMESAPROC get_swap_interval = NULL;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-display") == 0) {
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if (strcmp(argv[i], "-display") == 0 && i + 1 < argc) {
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dpyName = argv[i+1];
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i++;
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}
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else if (strcmp(argv[i], "-info") == 0) {
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printInfo = GL_TRUE;
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}
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else if (strcmp(argv[i], "-swap") == 0 && i + 1 < argc) {
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swap_interval = atoi( argv[i+1] );
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do_swap_interval = GL_TRUE;
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i++;
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}
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else if (strcmp(argv[i], "-forcegetrate") == 0) {
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/* This option was put in because some DRI drivers don't support the
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* full GLX_OML_sync_control extension, but they do support
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* glXGetMscRateOML.
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*/
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force_get_rate = GL_TRUE;
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}
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else if (strcmp(argv[i], "-help") == 0) {
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printf("Usage:\n");
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printf(" gears [options]\n");
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printf("Options:\n");
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printf(" -help Print this information\n");
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printf(" -display displayName Specify X display\n");
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printf(" -info Display GL information\n");
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printf(" -swap N Swap no more than once per N vertical refreshes\n");
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printf(" -forcgetrate Try to use glXGetMscRateOML function\n");
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return 0;
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}
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}
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dpy = XOpenDisplay(dpyName);
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@ -482,11 +663,53 @@ main(int argc, char *argv[])
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XMapWindow(dpy, win);
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glXMakeCurrent(dpy, win, ctx);
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make_extension_table( (char *) glXQueryExtensionsString(dpy,DefaultScreen(dpy)) );
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has_OML_sync_control = is_extension_supported( "GLX_OML_sync_control" );
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has_SGI_swap_control = is_extension_supported( "GLX_SGI_swap_control" );
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has_MESA_swap_control = is_extension_supported( "GLX_MESA_swap_control" );
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if ( has_MESA_swap_control ) {
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set_swap_interval = (PFNGLXSWAPINTERVALMESAPROC) glXGetProcAddressARB( (const GLubyte *) "glXSwapIntervalMESA" );
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get_swap_interval = (PFNGLXGETSWAPINTERVALMESAPROC) glXGetProcAddressARB( (const GLubyte *) "glXGetSwapIntervalMESA" );
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}
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else if ( has_SGI_swap_control ) {
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set_swap_interval = (PFNGLXSWAPINTERVALMESAPROC) glXGetProcAddressARB( (const GLubyte *) "glXSwapIntervalSGI" );
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}
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if (printInfo) {
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
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printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
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if ( has_OML_sync_control || force_get_rate ) {
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show_refresh_rate( dpy );
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}
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if ( get_swap_interval != NULL ) {
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printf("Default swap interval = %d\n", (*get_swap_interval)() );
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}
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}
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if ( do_swap_interval ) {
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if ( set_swap_interval != NULL ) {
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if ( ((swap_interval == 0) && !has_MESA_swap_control)
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|| (swap_interval < 0) ) {
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printf( "Swap interval must be non-negative or greater than zero "
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"if GLX_MESA_swap_control is not supported.\n" );
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}
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else {
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(*set_swap_interval)( swap_interval );
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}
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if ( printInfo && (get_swap_interval != NULL) ) {
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printf("Current swap interval = %d\n", (*get_swap_interval)() );
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}
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}
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else {
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printf("Unable to set swap-interval. Neither GLX_SGI_swap_control "
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"nor GLX_MESA_swap_control are supported.\n" );
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}
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}
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init();
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