diff options
Diffstat (limited to 'progs/xdemos/glthreads.c')
| -rw-r--r-- | progs/xdemos/glthreads.c | 281 |
1 files changed, 220 insertions, 61 deletions
diff --git a/progs/xdemos/glthreads.c b/progs/xdemos/glthreads.c index 4f87ee75d40..b90e6b4f319 100644 --- a/progs/xdemos/glthreads.c +++ b/progs/xdemos/glthreads.c @@ -27,16 +27,30 @@ * -l Enable application-side locking * -n <num threads> Number of threads to create (default is 2) * -display <display name> Specify X display (default is :0.0) + * -t Use texture mapping * * Brian Paul 20 July 2000 */ +/* + * Notes: + * - Each thread gets its own GLX context. + * + * - The GLX contexts share texture objects. + * + * - When 't' is pressed to update the texture image, the window/thread which + * has input focus is signalled to change the texture. The other threads + * should see the updated texture the next time they call glBindTexture. + */ + + #if defined(PTHREADS) /* defined by Mesa on Linux and other platforms */ #include <assert.h> #include <GL/gl.h> #include <GL/glx.h> +#include <math.h> #include <stdio.h> #include <stdlib.h> #include <string.h> @@ -56,6 +70,8 @@ struct winthread { float Angle; int WinWidth, WinHeight; GLboolean NewSize; + GLboolean Initialized; + GLboolean MakeNewTexture; }; @@ -66,8 +82,13 @@ static volatile GLboolean ExitFlag = GL_FALSE; static GLboolean MultiDisplays = 0; static GLboolean Locking = 0; +static GLboolean Texture = GL_FALSE; +static GLuint TexObj = 12; +static GLboolean Animate = GL_TRUE; static pthread_mutex_t Mutex; +static pthread_cond_t CondVar; +static pthread_mutex_t CondMutex; static void @@ -78,6 +99,59 @@ Error(const char *msg) } +static void +signal_redraw(void) +{ + pthread_mutex_lock(&CondMutex); + pthread_cond_broadcast(&CondVar); + pthread_mutex_unlock(&CondMutex); +} + + +static void +MakeNewTexture(struct winthread *wt) +{ +#define TEX_SIZE 128 + static float step = 0.0; + GLfloat image[TEX_SIZE][TEX_SIZE][4]; + GLint width; + int i, j; + + for (j = 0; j < TEX_SIZE; j++) { + for (i = 0; i < TEX_SIZE; i++) { + float dt = 5.0 * (j - 0.5 * TEX_SIZE) / TEX_SIZE; + float ds = 5.0 * (i - 0.5 * TEX_SIZE) / TEX_SIZE; + float r = dt * dt + ds * ds + step; + image[j][i][0] = + image[j][i][1] = + image[j][i][2] = 0.75 + 0.25 * cos(r); + image[j][i][3] = 1.0; + } + } + + step += 0.5; + + glBindTexture(GL_TEXTURE_2D, TexObj); + + glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width); + if (width) { + assert(width == TEX_SIZE); + /* sub-tex replace */ + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, TEX_SIZE, TEX_SIZE, + GL_RGBA, GL_FLOAT, image); + } + else { + /* create new */ + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TEX_SIZE, TEX_SIZE, 0, + GL_RGBA, GL_FLOAT, image); + } +} + + + /* draw a colored cube */ static void draw_object(void) @@ -86,52 +160,61 @@ draw_object(void) glScalef(0.75, 0.75, 0.75); glColor3f(1, 0, 0); - glBegin(GL_POLYGON); - glVertex3f(1, -1, -1); - glVertex3f(1, 1, -1); - glVertex3f(1, 1, 1); - glVertex3f(1, -1, 1); - glEnd(); + if (Texture) { + glBindTexture(GL_TEXTURE_2D, TexObj); + glEnable(GL_TEXTURE_2D); + } + else { + glDisable(GL_TEXTURE_2D); + } + + glBegin(GL_QUADS); + + /* -X */ glColor3f(0, 1, 1); - glBegin(GL_POLYGON); - glVertex3f(-1, -1, -1); - glVertex3f(-1, 1, -1); - glVertex3f(-1, 1, 1); - glVertex3f(-1, -1, 1); - glEnd(); + 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); - glColor3f(0, 1, 0); - glBegin(GL_POLYGON); - glVertex3f(-1, 1, -1); - glVertex3f( 1, 1, -1); - glVertex3f( 1, 1, 1); - glVertex3f(-1, 1, 1); - glEnd(); + /* +X */ + glColor3f(1, 0, 0); + 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); + /* -Y */ glColor3f(1, 0, 1); - glBegin(GL_POLYGON); - glVertex3f(-1, -1, -1); - glVertex3f( 1, -1, -1); - glVertex3f( 1, -1, 1); - glVertex3f(-1, -1, 1); - glEnd(); + 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); - glColor3f(0, 0, 1); - glBegin(GL_POLYGON); - glVertex3f(-1, -1, 1); - glVertex3f( 1, -1, 1); - glVertex3f( 1, 1, 1); - glVertex3f(-1, 1, 1); - glEnd(); + /* +Y */ + glColor3f(0, 1, 0); + 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); + /* -Z */ glColor3f(1, 1, 0); - glBegin(GL_POLYGON); - glVertex3f(-1, -1, -1); - glVertex3f( 1, -1, -1); - glVertex3f( 1, 1, -1); - glVertex3f(-1, 1, -1); + 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); + + /* +Y */ + glColor3f(0, 0, 1); + 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(); } @@ -143,6 +226,8 @@ resize(struct winthread *wt, int w, int h) wt->NewSize = GL_TRUE; wt->WinWidth = w; wt->WinHeight = h; + if (!Animate) + signal_redraw(); } @@ -152,18 +237,19 @@ resize(struct winthread *wt, int w, int h) static void draw_loop(struct winthread *wt) { - GLboolean firstIter = GL_TRUE; - while (!ExitFlag) { if (Locking) pthread_mutex_lock(&Mutex); glXMakeCurrent(wt->Dpy, wt->Win, wt->Context); - if (firstIter) { + if (!wt->Initialized) { printf("glthreads: %d: GL_RENDERER = %s\n", wt->Index, (char *) glGetString(GL_RENDERER)); - firstIter = GL_FALSE; + if (Texture /*&& wt->Index == 0*/) { + MakeNewTexture(wt); + } + wt->Initialized = GL_TRUE; } if (Locking) @@ -183,10 +269,15 @@ draw_loop(struct winthread *wt) wt->NewSize = GL_FALSE; } + if (wt->MakeNewTexture) { + MakeNewTexture(wt); + wt->MakeNewTexture = GL_FALSE; + } + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); - glRotatef(wt->Angle, 0, 0, 1); + glRotatef(wt->Angle, 0, 1, 0); glRotatef(wt->Angle, 1, 0, 0); glScalef(0.7, 0.7, 0.7); draw_object(); @@ -200,12 +291,63 @@ draw_loop(struct winthread *wt) if (Locking) pthread_mutex_unlock(&Mutex); - usleep(5000); + if (Animate) { + usleep(5000); + } + else { + /* wait for signal to draw */ + pthread_mutex_lock(&CondMutex); + pthread_cond_wait(&CondVar, &CondMutex); + pthread_mutex_unlock(&CondMutex); + } wt->Angle += 1.0; } } +static void +keypress(XEvent *event, struct winthread *wt) +{ + char buf[100]; + KeySym keySym; + XComposeStatus stat; + + XLookupString(&event->xkey, buf, sizeof(buf), &keySym, &stat); + + switch (keySym) { + case XK_Escape: + /* tell all threads to exit */ + if (!Animate) { + signal_redraw(); + } + ExitFlag = GL_TRUE; + /*printf("exit draw_loop %d\n", wt->Index);*/ + return; + case XK_t: + case XK_T: + if (Texture) { + wt->MakeNewTexture = GL_TRUE; + if (!Animate) + signal_redraw(); + } + break; + case XK_a: + case XK_A: + Animate = !Animate; + if (Animate) /* yes, prev Animate state! */ + signal_redraw(); + break; + case XK_s: + case XK_S: + if (!Animate) + signal_redraw(); + break; + default: + ; /* nop */ + } +} + + /* * The main process thread runs this loop. * Single display connection for all threads. @@ -251,10 +393,14 @@ event_loop(Display *dpy) } break; case KeyPress: - /* tell all threads to exit */ - ExitFlag = GL_TRUE; - /*printf("exit draw_loop %d\n", wt->Index);*/ - return; + for (i = 0; i < NumWinThreads; i++) { + struct winthread *wt = &WinThreads[i]; + if (event.xkey.window == wt->Win) { + keypress(&event, wt); + break; + } + } + break; default: /*no-op*/ ; } @@ -282,12 +428,10 @@ event_loop_multi(void) resize(wt, event.xconfigure.width, event.xconfigure.height); break; case KeyPress: - /* tell all threads to exit */ - ExitFlag = GL_TRUE; - /*printf("exit draw_loop %d\n", wt->Index);*/ - return; + keypress(&event, wt); + break; default: - /*no-op*/ ; + ; /* nop */ } } w = (w + 1) % NumWinThreads; @@ -301,7 +445,7 @@ event_loop_multi(void) * we'll call this once for each thread, before the threads are created. */ static void -create_window(struct winthread *wt) +create_window(struct winthread *wt, GLXContext shareCtx) { Window win; GLXContext ctx; @@ -317,9 +461,9 @@ create_window(struct winthread *wt) unsigned long mask; Window root; XVisualInfo *visinfo; - int width = 80, height = 80; - int xpos = (wt->Index % 10) * 90; - int ypos = (wt->Index / 10) * 100; + int width = 160, height = 160; + int xpos = (wt->Index % 8) * (width + 10); + int ypos = (wt->Index / 8) * (width + 20); scrnum = DefaultScreen(wt->Dpy); root = RootWindow(wt->Dpy, scrnum); @@ -356,7 +500,7 @@ create_window(struct winthread *wt) } - ctx = glXCreateContext(wt->Dpy, visinfo, NULL, True); + ctx = glXCreateContext(wt->Dpy, visinfo, shareCtx, True); if (!ctx) { Error("Couldn't create GLX context"); } @@ -417,6 +561,12 @@ usage(void) printf(" -n NUMTHREADS Number of threads to create\n"); printf(" -p Use a separate display connection for each thread\n"); printf(" -l Use application-side locking\n"); + printf(" -t Enable texturing\n"); + printf("Keyboard:\n"); + printf(" Esc Exit\n"); + printf(" t Change texture image (requires -t option)\n"); + printf(" a Toggle animation\n"); + printf(" s Step rotation (when not animating)\n"); } @@ -445,6 +595,9 @@ main(int argc, char *argv[]) else if (strcmp(argv[i], "-l") == 0) { Locking = 1; } + else if (strcmp(argv[i], "-t") == 0) { + Texture = 1; + } else if (strcmp(argv[i], "-n") == 0 && i + 1 < argc) { numThreads = atoi(argv[i + 1]); if (numThreads < 1) @@ -491,9 +644,9 @@ main(int argc, char *argv[]) } } - if (Locking) { - pthread_mutex_init(&Mutex, NULL); - } + pthread_mutex_init(&Mutex, NULL); + pthread_mutex_init(&CondMutex, NULL); + pthread_cond_init(&CondVar, NULL); printf("glthreads: creating windows\n"); @@ -501,6 +654,8 @@ main(int argc, char *argv[]) /* Create the GLX windows and contexts */ for (i = 0; i < numThreads; i++) { + GLXContext share; + if (MultiDisplays) { WinThreads[i].Dpy = XOpenDisplay(displayName); assert(WinThreads[i].Dpy); @@ -509,7 +664,11 @@ main(int argc, char *argv[]) WinThreads[i].Dpy = dpy; } WinThreads[i].Index = i; - create_window(&WinThreads[i]); + WinThreads[i].Initialized = GL_FALSE; + + share = (Texture && i > 0) ? WinThreads[0].Context : 0; + + create_window(&WinThreads[i], share); } printf("glthreads: creating threads\n"); |