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-rw-r--r--progs/xdemos/glxgears.c109
1 files changed, 104 insertions, 5 deletions
diff --git a/progs/xdemos/glxgears.c b/progs/xdemos/glxgears.c
index 8475cab07af..f6acd99f6bf 100644
--- a/progs/xdemos/glxgears.c
+++ b/progs/xdemos/glxgears.c
@@ -58,8 +58,15 @@ typedef GLint ( * PFNGLXGETSWAPINTERVALMESAPROC) ( void );
typedef Bool ( * PFNGLXGETMSCRATEOMLPROC) (Display *dpy, GLXDrawable drawable, int32_t *numerator, int32_t *denominator);
#endif
+#ifndef GLX_MESA_swap_frame_usage
+#define GLX_MESA_swap_frame_usage 1
+typedef int ( * PFNGLXGETFRAMEUSAGEMESAPROC) (Display *dpy, GLXDrawable drawable, float * usage );
+#endif
+
#define BENCHMARK
+PFNGLXGETFRAMEUSAGEMESAPROC get_frame_usage = NULL;
+
#ifdef BENCHMARK
/* XXX this probably isn't very portable */
@@ -108,10 +115,14 @@ static GLfloat angle = 0.0;
static GLboolean has_OML_sync_control = GL_FALSE;
static GLboolean has_SGI_swap_control = GL_FALSE;
static GLboolean has_MESA_swap_control = GL_FALSE;
+static GLboolean has_MESA_swap_frame_usage = GL_FALSE;
static char ** extension_table = NULL;
static unsigned num_extensions;
+static GLboolean use_ztrick = GL_FALSE;
+static GLfloat aspect;
+
/*
*
* Draw a gear wheel. You'll probably want to call this function when
@@ -139,6 +150,7 @@ gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
da = 2.0 * M_PI / teeth / 4.0;
glShadeModel(GL_FLAT);
+ glPolygonMode( GL_FRONT, GL_LINE );
glNormal3f(0.0, 0.0, 1.0);
@@ -254,7 +266,65 @@ gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
static void
draw(void)
{
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ if ( use_ztrick ) {
+ static GLboolean flip = GL_FALSE;
+ static const GLfloat vert[4][3] = {
+ { -1, -1, -0.999 },
+ { 1, -1, -0.999 },
+ { 1, 1, -0.999 },
+ { -1, 1, -0.999 }
+ };
+ static const GLfloat col[4][3] = {
+ { 1.0, 0.6, 0.0 },
+ { 1.0, 0.6, 0.0 },
+ { 0.0, 0.0, 0.0 },
+ { 0.0, 0.0, 0.0 },
+ };
+
+ if ( flip ) {
+ glDepthRange(0, 0.5);
+ glDepthFunc(GL_LEQUAL);
+ }
+ else {
+ glDepthRange(1.0, 0.4999);
+ glDepthFunc(GL_GEQUAL);
+ }
+
+ flip = !flip;
+
+ /* The famous Quake "Z trick" only works when the whole screen is
+ * re-drawn each frame.
+ */
+
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(-1, 1, -1, 1, -1, 1);
+ glDisable(GL_LIGHTING);
+ glShadeModel(GL_SMOOTH);
+
+ glEnable( GL_VERTEX_ARRAY );
+ glEnable( GL_COLOR_ARRAY );
+ glVertexPointer( 3, GL_FLOAT, 0, vert );
+ glColorPointer( 3, GL_FLOAT, 0, col );
+ glDrawArrays( GL_POLYGON, 0, 4 );
+ glDisable( GL_COLOR_ARRAY );
+ glDisable( GL_VERTEX_ARRAY );
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-1.0, 1.0, -aspect, aspect, 5.0, 60.0);
+
+ glEnable(GL_LIGHTING);
+
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslatef(0.0, 0.0, -40.0);
+ }
+ else {
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ }
glPushMatrix();
glRotatef(view_rotx, 1.0, 0.0, 0.0);
@@ -287,12 +357,14 @@ draw(void)
static void
reshape(int width, int height)
{
- GLfloat h = (GLfloat) height / (GLfloat) width;
+ aspect = (GLfloat) height / (GLfloat) width;
+
glViewport(0, 0, (GLint) width, (GLint) height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
- glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
+
+ glFrustum(-1.0, 1.0, -aspect, aspect, 5.0, 60.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -40.0);
@@ -409,6 +481,8 @@ make_window( Display *dpy, const char *name,
static void
event_loop(Display *dpy, Window win)
{
+ float frame_usage = 0.0;
+
while (1) {
while (XPending(dpy) > 0) {
XEvent event;
@@ -453,6 +527,13 @@ event_loop(Display *dpy, Window win)
angle += 2.0;
draw();
+ if ( get_frame_usage != NULL ) {
+ GLfloat temp;
+
+ (*get_frame_usage)( dpy, win, & temp );
+ frame_usage += temp;
+ }
+
glXSwapBuffers(dpy, win);
/* calc framerate */
@@ -469,10 +550,19 @@ event_loop(Display *dpy, Window win)
if (t - t0 >= 5.0) {
GLfloat seconds = t - t0;
GLfloat fps = frames / seconds;
- printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
- fps);
+ if ( get_frame_usage != NULL ) {
+ printf("%d frames in %3.1f seconds = %6.3f FPS (%3.1f%% usage)\n",
+ frames, seconds, fps,
+ (frame_usage * 100.0) / (float) frames );
+ }
+ else {
+ printf("%d frames in %3.1f seconds = %6.3f FPS\n",
+ frames, seconds, fps);
+ }
+
t0 = t;
frames = 0;
+ frame_usage = 0.0;
}
}
}
@@ -642,6 +732,9 @@ main(int argc, char *argv[])
*/
force_get_rate = GL_TRUE;
}
+ else if (strcmp(argv[i], "-ztrick") == 0) {
+ use_ztrick = GL_TRUE;
+ }
else if (strcmp(argv[i], "-help") == 0) {
printf("Usage:\n");
printf(" gears [options]\n");
@@ -669,6 +762,7 @@ main(int argc, char *argv[])
has_OML_sync_control = is_extension_supported( "GLX_OML_sync_control" );
has_SGI_swap_control = is_extension_supported( "GLX_SGI_swap_control" );
has_MESA_swap_control = is_extension_supported( "GLX_MESA_swap_control" );
+ has_MESA_swap_frame_usage = is_extension_supported( "GLX_MESA_swap_frame_usage" );
if ( has_MESA_swap_control ) {
set_swap_interval = (PFNGLXSWAPINTERVALMESAPROC) glXGetProcAddressARB( (const GLubyte *) "glXSwapIntervalMESA" );
@@ -679,6 +773,11 @@ main(int argc, char *argv[])
}
+ if ( has_MESA_swap_frame_usage ) {
+ get_frame_usage = (PFNGLXGETFRAMEUSAGEMESAPROC) glXGetProcAddressARB( (const GLubyte *) "glXGetFrameUsageMESA" );
+ }
+
+
if (printInfo) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 07:29:07 +0000