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mesa/progs/xdemos/manywin.c

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/*
* Create N GLX windows/contexts and render to them in round-robin order.
* Also, have the contexts share all texture objects.
* Press 'd' to delete a texture, 'u' to unbind it.
*
* 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.
*/
#include <GL/gl.h>
#include <GL/glx.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <X11/keysym.h>
/*
* Each display/window/context:
*/
struct head {
char DisplayName[1000];
Display *Dpy;
Window Win;
GLXContext Context;
float Angle;
char Renderer[1000];
char Vendor[1000];
char Version[1000];
};
#define MAX_HEADS 200
static struct head Heads[MAX_HEADS];
static int NumHeads = 0;
static GLboolean SwapSeparate = GL_TRUE;
static GLuint TexObj = 0;
static void
Error(const char *display, const char *msg)
{
fprintf(stderr, "Error on display %s - %s\n", XDisplayName(display), msg);
exit(1);
}
static struct head *
AddHead(const char *displayName, const char *name)
{
Display *dpy;
Window win;
GLXContext ctx;
int attrib[] = { GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DOUBLEBUFFER,
None };
int scrnum;
XSetWindowAttributes attr;
unsigned long mask;
Window root;
XVisualInfo *visinfo;
int width = 90, height = 90;
int xpos = 0, ypos = 0;
if (NumHeads >= MAX_HEADS)
return NULL;
dpy = XOpenDisplay(displayName);
if (!dpy) {
Error(displayName, "Unable to open display");
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 */
xpos = (NumHeads % 10) * 100;
ypos = (NumHeads / 10) * 100;
printf("%d, %d\n", xpos, ypos);
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
mask = CWBackPixel | 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, name, name,
None, (char **)NULL, 0, &sizehints);
}
if (NumHeads == 0) {
ctx = glXCreateContext(dpy, visinfo, NULL, True);
}
else {
/* share textures & dlists with 0th context */
printf("sharing\n");
ctx = glXCreateContext(dpy, visinfo, Heads[0].Context, 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 Redraw()\n");
return NULL;
}
if (NumHeads == 0) {
/* create texture object now */
static const GLubyte checker[2][2][4] = {
{ {255, 255, 255, 255}, { 0, 0, 0, 255} },
{ { 0, 0, 0, 0}, {255, 255, 255, 255} }
};
glGenTextures(1, &TexObj);
assert(TexObj);
glBindTexture(GL_TEXTURE_2D, TexObj);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGB,
GL_UNSIGNED_BYTE, checker);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
else {
/* bind 0th context's texture in this context too */
assert(TexObj);
glBindTexture(GL_TEXTURE_2D, TexObj);
}
glEnable(GL_TEXTURE_2D);
/* save the info for this head */
{
struct head *h = &Heads[NumHeads];
const char * tmp;
if (strlen(name) + 1 > sizeof(h->DisplayName)) {
Error(displayName, "name string overflow");
return NULL;
}
strcpy(h->DisplayName, name);
h->Dpy = dpy;
h->Win = win;
h->Context = ctx;
h->Angle = 0.0;
tmp = (char *) glGetString(GL_VERSION);
if (strlen(tmp) + 1 > sizeof(h->Version)) {
Error(displayName, "GL_VERSION string overflow");
return NULL;
}
strcpy(h->Version, tmp);
tmp = (char *) glGetString(GL_VENDOR);
if (strlen(tmp) + 1 > sizeof(h->Vendor)) {
Error(displayName, "GL_VENDOR string overflow");
return NULL;
}
strcpy(h->Vendor, tmp);
tmp = (char *) glGetString(GL_RENDERER);
if (strlen(tmp) + 1 > sizeof(h->Renderer)) {
Error(displayName, "GL_RENDERER string overflow");
return NULL;
}
strcpy(h->Renderer, tmp);
NumHeads++;
return &Heads[NumHeads-1];
}
}
static void
DestroyHeads(void)
{
int i;
for (i = 0; i < NumHeads; i++) {
XDestroyWindow(Heads[i].Dpy, Heads[i].Win);
glXDestroyContext(Heads[i].Dpy, Heads[i].Context);
XCloseDisplay(Heads[i].Dpy);
}
}
static void
Redraw(struct head *h)
{
if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
Error(h->DisplayName, "glXMakeCurrent failed");
printf("glXMakeCurrent failed in Redraw()\n");
return;
}
h->Angle += 1.0;
glShadeModel(GL_FLAT);
glClearColor(0.5, 0.5, 0.5, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
/* draw green triangle */
glColor3f(0.0, 1.0, 0.0);
glPushMatrix();
glRotatef(h->Angle, 0, 0, 1);
glBegin(GL_TRIANGLES);
glTexCoord2f(0.5, 1.0); glVertex2f(0, 0.8);
glTexCoord2f(0.0, 0.0); glVertex2f(-0.8, -0.7);
glTexCoord2f(1.0, 0.0); glVertex2f(0.8, -0.7);
glEnd();
glPopMatrix();
if (!SwapSeparate)
glXSwapBuffers(h->Dpy, h->Win);
}
static void
Swap(struct head *h)
{
glXSwapBuffers(h->Dpy, h->Win);
}
static void
Resize(const struct head *h, unsigned int width, unsigned int height)
{
if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
Error(h->DisplayName, "glXMakeCurrent failed in Resize()");
return;
}
glFlush();
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
}
static void
EventLoop(void)
{
while (1) {
int i;
for (i = 0; i < NumHeads; i++) {
struct head *h = &Heads[i];
while (XPending(h->Dpy) > 0) {
XEvent event;
XNextEvent(h->Dpy, &event);
if (event.xany.window == h->Win) {
switch (event.type) {
case Expose:
Redraw(h);
if (SwapSeparate)
Swap(h);
break;
case ConfigureNotify:
Resize(h, event.xconfigure.width, event.xconfigure.height);
break;
case KeyPress:
{
char buf[100];
KeySym keySym;
XComposeStatus stat;
XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
switch (keySym) {
case XK_Escape:
return;
break;
case XK_d:
case XK_D:
printf("Delete Texture in window %d\n", i);
glXMakeCurrent(h->Dpy, h->Win, h->Context);
glDeleteTextures(1, &TexObj);
break;
case XK_u:
case XK_U:
printf("Unbind Texture in window %d\n", i);
glXMakeCurrent(h->Dpy, h->Win, h->Context);
glBindTexture(GL_TEXTURE_2D, 0);
break;
}
}
break;
default:
/*no-op*/ ;
}
}
else {
printf("window mismatch\n");
}
}
}
/* redraw all windows */
for (i = 0; i < NumHeads; i++) {
Redraw(&Heads[i]);
}
/* swapbuffers on all windows, if not already done */
if (SwapSeparate) {
for (i = 0; i < NumHeads; i++) {
Swap(&Heads[i]);
}
}
usleep(1);
}
}
static void
PrintInfo(const struct head *h)
{
printf("Name: %s\n", h->DisplayName);
printf(" Display: %p\n", (void *) h->Dpy);
printf(" Window: 0x%x\n", (int) h->Win);
printf(" Context: 0x%lx\n", (long) h->Context);
printf(" GL_VERSION: %s\n", h->Version);
printf(" GL_VENDOR: %s\n", h->Vendor);
printf(" GL_RENDERER: %s\n", h->Renderer);
}
int
main(int argc, char *argv[])
{
char *dpyName = NULL;
int i;
if (argc == 1) {
printf("manywin: open N simultaneous glx windows\n");
printf("Usage:\n");
printf(" manywin [-s] numWindows\n");
printf("Options:\n");
printf(" -s = swap immediately after drawing (see src code)\n");
printf("Example:\n");
printf(" manywin 10\n");
return 0;
}
else {
int n = 3;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-s") == 0) {
SwapSeparate = GL_FALSE;
}
else if (strcmp(argv[i], "-display") == 0 && i < argc) {
dpyName = argv[i+1];
i++;
}
else {
n = atoi(argv[i]);
}
}
if (n < 1)
n = 1;
if (n > MAX_HEADS)
n = MAX_HEADS;
printf("%d windows\n", n);
for (i = 0; i < n; i++) {
char name[100];
struct head *h;
sprintf(name, "%d", i);
h = AddHead(dpyName, name);
if (h) {
PrintInfo(h);
}
}
}
EventLoop();
DestroyHeads();
return 0;
}
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