xdemos: Add multithreaded sharedtex_mt.

Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>

2 files changed, 524 insertions, 0 deletions

diff --git a/progs/xdemos/Makefile b/progs/xdemos/Makefile
index 8d248fb0a9..bb353e318c 100644
--- a/progs/xdemos/Makefile
+++ b/progs/xdemos/Makefile
@@ -31,6 +31,7 @@ PROGS = \
 	pbinfo \
 	pbdemo \
 	sharedtex \
+        sharedtex_mt \
 	texture_from_pixmap \
 	wincopy \
 	xfont \
diff --git a/progs/xdemos/sharedtex_mt.c b/progs/xdemos/sharedtex_mt.c
new file mode 100644
index 0000000000..8cac7826e0
--- /dev/null
+++ b/progs/xdemos/sharedtex_mt.c
@@ -0,0 +1,523 @@
+/* $Id: sharedtex.c,v 1.2 2002/01/16 14:32:46 joukj Exp $ */
+
+/*
+ * Test sharing of display lists and texture objects between GLX contests.
+ * Brian Paul
+ * Summer 2000
+ *
+ *
+ * Copyright (C) 2000  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ *
+ * Modified 2009 for multithreading by Thomas Hellstrom.
+ */
+
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <pthread.h>
+#include <X11/X.h>
+
+struct thread_init_arg {
+   int id;
+};
+
+struct window {
+   pthread_mutex_t drawMutex;
+   char DisplayName[1000];
+   Display *Dpy;
+   Window Win;
+   GLXContext Context;
+   float Angle;
+   int Id;
+   XVisualInfo *visInfo;
+};
+
+
+#define MAX_WINDOWS 20
+static struct window Windows[MAX_WINDOWS];
+static int NumWindows = 0;
+static int terminate = 0;
+static GLXContext gCtx;
+static Display *gDpy;
+static GLuint Textures[3];
+
+
+
+static void
+Error(const char *display, const char *msg)
+{
+   fprintf(stderr, "Error on display %s - %s\n", display, msg);
+   exit(1);
+}
+
+
+static int
+initMainthread(Display *dpy, const char *displayName)
+{
+   int scrnum;
+   XVisualInfo *visinfo;
+   int attrib[] = { GLX_RGBA,
+		    GLX_RED_SIZE, 1,
+		    GLX_GREEN_SIZE, 1,
+		    GLX_BLUE_SIZE, 1,
+		    GLX_DOUBLEBUFFER,
+                    GLX_DEPTH_SIZE, 1,
+		    None };
+
+   scrnum = DefaultScreen(dpy);
+   visinfo = glXChooseVisual(dpy, scrnum, attrib);
+   if (!visinfo) {
+      Error(displayName, "Unable to find RGB, double-buffered visual");
+      return -1;
+   }
+   gCtx = glXCreateContext(dpy, visinfo, NULL, True);
+   if (!gCtx) {
+      Error(displayName, "Couldn't create GLX context");
+      return -1;
+   }
+   return 0;
+}
+
+static struct window *
+AddWindow(Display *dpy, const char *displayName, int xpos, int ypos,
+          GLXContext sCtx)
+{
+   Window win;
+   GLXContext ctx;
+   int attrib[] = { GLX_RGBA,
+		    GLX_RED_SIZE, 1,
+		    GLX_GREEN_SIZE, 1,
+		    GLX_BLUE_SIZE, 1,
+		    GLX_DOUBLEBUFFER,
+                    GLX_DEPTH_SIZE, 1,
+		    None };
+   int scrnum;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+   XVisualInfo *visinfo;
+   int width = 300, height = 300;
+
+   if (NumWindows >= MAX_WINDOWS)
+      return NULL;
+
+   scrnum = DefaultScreen(dpy);
+   root = RootWindow(dpy, scrnum);
+
+   visinfo = glXChooseVisual(dpy, scrnum, attrib);
+   if (!visinfo) {
+      Error(displayName, "Unable to find RGB, double-buffered visual");
+      return NULL;
+   }
+
+   /* window attributes */
+   attr.background_pixel = 0;
+   attr.border_pixel = 0;
+   attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
+   attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
+   mask = CWBorderPixel | CWColormap | CWEventMask;
+
+   win = XCreateWindow(dpy, root, xpos, ypos, width, height,
+		       0, visinfo->depth, InputOutput,
+		       visinfo->visual, mask, &attr);
+   if (!win) {
+      Error(displayName, "Couldn't create window");
+      return NULL;
+   }
+
+   {
+      XSizeHints sizehints;
+      sizehints.x = xpos;
+      sizehints.y = ypos;
+      sizehints.width  = width;
+      sizehints.height = height;
+      sizehints.flags = USSize | USPosition;
+      XSetNormalHints(dpy, win, &sizehints);
+      XSetStandardProperties(dpy, win, displayName, displayName,
+			     None, (char **)NULL, 0, &sizehints);
+   }
+
+
+   ctx = glXCreateContext(dpy, visinfo,
+                          sCtx ? sCtx : NULL, True);
+
+   if (!ctx) {
+      Error(displayName, "Couldn't create GLX context");
+      return NULL;
+   }
+
+   XMapWindow(dpy, win);
+
+   if (!glXMakeCurrent(dpy, win, ctx)) {
+      Error(displayName, "glXMakeCurrent failed");
+      printf("glXMakeCurrent failed in AddWindow()\n");
+      return NULL;
+   }
+
+   /* save the info for this window */
+   {
+      static int id = 0;
+      struct window *h = &Windows[NumWindows];
+      strcpy(h->DisplayName, displayName);
+      h->Dpy = dpy;
+      h->Win = win;
+      h->Context = ctx;
+      h->Angle = 0.0;
+      h->Id = id++;
+      h->visInfo = visinfo;
+      pthread_mutex_init(&h->drawMutex, NULL);
+      NumWindows++;
+      return &Windows[NumWindows-1];
+   }
+}
+
+
+static void
+InitGLstuff(void)
+
+{
+   glGenTextures(3, Textures);
+
+   /* setup first texture object */
+   {
+      GLubyte image[16][16][4];
+      GLint i, j;
+      glBindTexture(GL_TEXTURE_2D, Textures[0]);
+
+      /* red/white checkerboard */
+      for (i = 0; i < 16; i++) {
+         for (j = 0; j < 16; j++) {
+            if ((i ^ j) & 1) {
+               image[i][j][0] = 255;
+               image[i][j][1] = 255;
+               image[i][j][2] = 255;
+               image[i][j][3] = 255;
+            }
+            else {
+               image[i][j][0] = 255;
+               image[i][j][1] = 0;
+               image[i][j][2] = 0;
+               image[i][j][3] = 255;
+            }
+         }
+      }
+
+      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
+                   GL_UNSIGNED_BYTE, image);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   }
+
+   /* setup second texture object */
+   {
+      GLubyte image[8][8][3];
+      GLint i, j;
+      glBindTexture(GL_TEXTURE_2D, Textures[1]);
+
+      /* green/yellow checkerboard */
+      for (i = 0; i < 8; i++) {
+         for (j = 0; j < 8; j++) {
+            if ((i ^ j) & 1) {
+               image[i][j][0] = 0;
+               image[i][j][1] = 255;
+               image[i][j][2] = 0;
+            }
+            else {
+               image[i][j][0] = 255;
+               image[i][j][1] = 255;
+               image[i][j][2] = 0;
+            }
+         }
+      }
+
+      glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
+      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB,
+                   GL_UNSIGNED_BYTE, image);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   }
+
+   /* setup second texture object */
+   {
+      GLubyte image[4][4][3];
+      GLint i, j;
+      glBindTexture(GL_TEXTURE_2D, Textures[2]);
+
+      /* blue/gray checkerboard */
+      for (i = 0; i < 4; i++) {
+         for (j = 0; j < 4; j++) {
+            if ((i ^ j) & 1) {
+               image[i][j][0] = 0;
+               image[i][j][1] = 0;
+               image[i][j][2] = 255;
+            }
+            else {
+               image[i][j][0] = 200;
+               image[i][j][1] = 200;
+               image[i][j][2] = 200;
+            }
+         }
+      }
+
+      glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
+      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 4, 4, 0, GL_RGB,
+                   GL_UNSIGNED_BYTE, image);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   }
+
+   /* Now make the cube object display list */
+
+   printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
+   printf("GL_VERSION: %s\n", (char *) glGetString(GL_VERSION));
+   printf("GL_VENDOR: %s\n", (char *) glGetString(GL_VENDOR));
+}
+
+static void
+Redraw(struct window *h)
+{
+   h->Angle += 1.0;
+
+   glShadeModel(GL_FLAT);
+   glClearColor(0.25, 0.25, 0.25, 1.0);
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glEnable(GL_TEXTURE_2D);
+   glEnable(GL_DEPTH_TEST);
+   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+   glColor3f(1, 1, 1);
+
+   glPushMatrix();
+   if (h->Id == 0)
+      glRotatef(h->Angle, 0, 1, -1);
+   else if (h->Id == 1)
+      glRotatef(-(h->Angle), 0, 1, -1);
+   else if (h->Id == 2)
+      glRotatef(h->Angle, 0, 1, 1);
+   else if (h->Id == 3)
+      glRotatef(-(h->Angle), 0, 1, 1);
+   glBindTexture(GL_TEXTURE_2D, Textures[0]);
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
+   glTexCoord2f(1, 0);  glVertex3f(-1,  1, -1);
+   glTexCoord2f(1, 1);  glVertex3f(-1,  1,  1);
+   glTexCoord2f(0, 1);  glVertex3f(-1, -1,  1);
+   glEnd();
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 0);  glVertex3f(1, -1, -1);
+   glTexCoord2f(1, 0);  glVertex3f(1,  1, -1);
+   glTexCoord2f(1, 1);  glVertex3f(1,  1,  1);
+   glTexCoord2f(0, 1);  glVertex3f(1, -1,  1);
+   glEnd();
+
+   glBindTexture(GL_TEXTURE_2D, Textures[1]);
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
+   glTexCoord2f(1, 0);  glVertex3f( 1, -1, -1);
+   glTexCoord2f(1, 1);  glVertex3f( 1, -1,  1);
+   glTexCoord2f(0, 1);  glVertex3f(-1, -1,  1);
+   glEnd();
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 0);  glVertex3f(-1, 1, -1);
+   glTexCoord2f(1, 0);  glVertex3f( 1, 1, -1);
+   glTexCoord2f(1, 1);  glVertex3f( 1, 1,  1);
+   glTexCoord2f(0, 1);  glVertex3f(-1, 1,  1);
+   glEnd();
+
+   glBindTexture(GL_TEXTURE_2D, Textures[2]);
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
+   glTexCoord2f(1, 0);  glVertex3f( 1, -1, -1);
+   glTexCoord2f(1, 1);  glVertex3f( 1,  1, -1);
+   glTexCoord2f(0, 1);  glVertex3f(-1,  1, -1);
+   glEnd();
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 0);  glVertex3f(-1, -1, 1);
+   glTexCoord2f(1, 0);  glVertex3f( 1, -1, 1);
+   glTexCoord2f(1, 1);  glVertex3f( 1,  1, 1);
+   glTexCoord2f(0, 1);  glVertex3f(-1,  1, 1);
+   glEnd();
+
+   glPopMatrix();
+
+   XLockDisplay(h->Dpy);
+   glXSwapBuffers(h->Dpy, h->Win);
+   XUnlockDisplay(h->Dpy);
+}
+
+static void *threadRunner (void *arg)
+{
+   struct thread_init_arg *tia = (struct thread_init_arg *) arg;
+   struct window *win;
+
+   win = &Windows[tia->id];
+   XLockDisplay(win->Dpy);
+   if (!glXMakeCurrent(win->Dpy, win->Win, win->Context)) {
+      Error(win->DisplayName, "glXMakeCurrent failed in threadRunner");
+      XUnlockDisplay(win->Dpy);
+      return NULL;
+   }
+   XUnlockDisplay(win->Dpy);
+
+   while(!terminate) {
+      usleep(1000);
+      pthread_mutex_lock(&win->drawMutex);
+      Redraw(win);
+      glFinish();
+      pthread_mutex_unlock(&win->drawMutex);
+   }
+
+   pthread_mutex_destroy(&win->drawMutex);
+   return NULL;
+}
+
+static void
+Resize(struct window *h, unsigned int width, unsigned int height)
+{
+   pthread_mutex_lock(&h->drawMutex);
+   XLockDisplay(h->Dpy);
+
+   if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
+      Error(h->DisplayName, "glXMakeCurrent failed in Resize()");
+      XUnlockDisplay(h->Dpy);
+      pthread_mutex_unlock(&h->drawMutex);
+      return;
+   }
+   XUnlockDisplay(h->Dpy);
+
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum(-1, 1, -1, 1, 2, 10);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0, 0, -4.5);
+   glFinish();
+   pthread_mutex_unlock(&h->drawMutex);
+}
+
+
+static void
+EventLoop(void)
+{
+   while (1) {
+      int i;
+      XLockDisplay(gDpy);
+      while (XPending(gDpy) > 0) {
+	 XEvent event;
+	 XNextEvent(gDpy, &event);
+	 XUnlockDisplay(gDpy);
+	 for (i = 0; i < NumWindows; i++) {
+	    struct window *h = &Windows[i];
+            if (event.xany.window == h->Win) {
+               switch (event.type) {
+	       case Expose:
+
+		  /*
+		   * Note, that here the main thread is actually sharing
+		   * context
+		   * with window h's thread. This sharing is protected by
+		   * the h->drawMutex, and is a bit nasty.
+		   * We always need to call glFinish() before releasing
+		   * the mutex. One might think that glFlush() would be enough,
+		   * but glFlush() doesn't imply that all driver buffers are
+		   * _immediately_ flushed to the hardware.
+		   */
+
+		  pthread_mutex_lock(&h->drawMutex);
+		  XLockDisplay(gDpy);
+		  if (!glXMakeCurrent(gDpy, h->Win, h->Context)) {
+		     Error(h->DisplayName, "glXMakeCurrent failed in Expose");
+		     XUnlockDisplay(gDpy);
+		     return;
+		  }
+		  XUnlockDisplay(gDpy);
+		  Redraw(h);
+		  glFinish();
+		  pthread_mutex_unlock(&h->drawMutex);
+		  break;
+	       case ConfigureNotify:
+		  Resize(h, event.xconfigure.width, event.xconfigure.height);
+		  break;
+	       case KeyPress:
+		  terminate = 1;
+		  return;
+	       default:
+		  /*no-op*/ ;
+               }
+            }
+	 }
+	 XLockDisplay(gDpy);
+      }
+      XUnlockDisplay(gDpy);
+      usleep(1000);
+   }
+}
+
+int
+main(int argc, char *argv[])
+{
+   const char *dpyName = XDisplayName(NULL);
+   pthread_t t0, t1, t2, t3;
+   struct thread_init_arg tia0, tia1, tia2, tia3;
+   struct window *h0, *h1, *h2, *h3;
+
+   XInitThreads();
+
+   gDpy = XOpenDisplay(dpyName);
+   if (!gDpy) {
+      Error(dpyName, "Unable to open display");
+      return -1;
+   }
+
+   if (initMainthread(gDpy, dpyName))
+      return -1;
+
+   /* four windows and contexts sharing display lists and texture objects */
+   h0 = AddWindow(gDpy, dpyName,  10,  10, gCtx);
+   h1 = AddWindow(gDpy, dpyName, 330,  10, gCtx);
+   h2 = AddWindow(gDpy, dpyName,  10, 350, gCtx);
+   h3 = AddWindow(gDpy, dpyName, 330, 350, gCtx);
+
+   if (!glXMakeCurrent(gDpy, h0->Win, gCtx)) {
+      Error(dpyName, "glXMakeCurrent failed for init thread.");
+      return -1;
+   }
+
+   InitGLstuff();
+
+   tia0.id = 0;
+   pthread_create(&t0, NULL, threadRunner, &tia0);
+   tia1.id = 1;
+   pthread_create(&t1, NULL, threadRunner, &tia1);
+   tia2.id = 2;
+   pthread_create(&t2, NULL, threadRunner, &tia2);
+   tia3.id = 3;
+   pthread_create(&t3, NULL, threadRunner, &tia3);
+   EventLoop();
+   return 0;
+}