394 lines
10 KiB
C
394 lines
10 KiB
C
/*
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* Create N GLX windows/contexts and render to them in round-robin order.
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* Also, have the contexts share all texture objects.
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* Press 'd' to delete a texture, 'u' to unbind it.
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*
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* Copyright (C) 2000 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <X11/keysym.h>
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/*
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* Each display/window/context:
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*/
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struct head {
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char DisplayName[1000];
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Display *Dpy;
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Window Win;
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GLXContext Context;
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float Angle;
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char Renderer[1000];
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char Vendor[1000];
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char Version[1000];
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};
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#define MAX_HEADS 200
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static struct head Heads[MAX_HEADS];
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static int NumHeads = 0;
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static GLboolean SwapSeparate = GL_TRUE;
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static GLuint TexObj = 0;
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static void
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Error(const char *display, const char *msg)
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{
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fprintf(stderr, "Error on display %s - %s\n", display, msg);
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exit(1);
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}
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static struct head *
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AddHead(const char *displayName, const char *name)
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{
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Display *dpy;
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Window win;
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GLXContext ctx;
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int attrib[] = { GLX_RGBA,
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GLX_RED_SIZE, 1,
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GLX_GREEN_SIZE, 1,
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GLX_BLUE_SIZE, 1,
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GLX_DOUBLEBUFFER,
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None };
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int scrnum;
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XSetWindowAttributes attr;
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unsigned long mask;
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Window root;
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XVisualInfo *visinfo;
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int width = 90, height = 90;
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int xpos = 0, ypos = 0;
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if (NumHeads >= MAX_HEADS)
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return NULL;
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dpy = XOpenDisplay(displayName);
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if (!dpy) {
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Error(displayName, "Unable to open display");
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return NULL;
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}
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scrnum = DefaultScreen(dpy);
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root = RootWindow(dpy, scrnum);
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visinfo = glXChooseVisual(dpy, scrnum, attrib);
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if (!visinfo) {
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Error(displayName, "Unable to find RGB, double-buffered visual");
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return NULL;
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}
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/* window attributes */
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xpos = (NumHeads % 10) * 100;
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ypos = (NumHeads / 10) * 100;
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printf("%d, %d\n", xpos, ypos);
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attr.background_pixel = 0;
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attr.border_pixel = 0;
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attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
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attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
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mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
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win = XCreateWindow(dpy, root, xpos, ypos, width, height,
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0, visinfo->depth, InputOutput,
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visinfo->visual, mask, &attr);
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if (!win) {
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Error(displayName, "Couldn't create window");
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return NULL;
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}
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{
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XSizeHints sizehints;
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sizehints.x = xpos;
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sizehints.y = ypos;
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sizehints.width = width;
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sizehints.height = height;
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sizehints.flags = USSize | USPosition;
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XSetNormalHints(dpy, win, &sizehints);
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XSetStandardProperties(dpy, win, name, name,
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None, (char **)NULL, 0, &sizehints);
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}
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if (NumHeads == 0) {
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ctx = glXCreateContext(dpy, visinfo, NULL, True);
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}
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else {
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/* share textures & dlists with 0th context */
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printf("sharing\n");
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ctx = glXCreateContext(dpy, visinfo, Heads[0].Context, True);
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}
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if (!ctx) {
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Error(displayName, "Couldn't create GLX context");
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return NULL;
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}
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XMapWindow(dpy, win);
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if (!glXMakeCurrent(dpy, win, ctx)) {
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Error(displayName, "glXMakeCurrent failed");
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printf("glXMakeCurrent failed in Redraw()\n");
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return NULL;
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}
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if (NumHeads == 0) {
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/* create texture object now */
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static const GLubyte checker[2][2][4] = {
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{ {255, 255, 255, 255}, { 0, 0, 0, 255} },
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{ { 0, 0, 0, 0}, {255, 255, 255, 255} }
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};
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glGenTextures(1, &TexObj);
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assert(TexObj);
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glBindTexture(GL_TEXTURE_2D, TexObj);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGB,
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GL_UNSIGNED_BYTE, checker);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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}
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else {
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/* bind 0th context's texture in this context too */
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assert(TexObj);
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glBindTexture(GL_TEXTURE_2D, TexObj);
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}
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glEnable(GL_TEXTURE_2D);
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/* save the info for this head */
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{
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struct head *h = &Heads[NumHeads];
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strcpy(h->DisplayName, name);
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h->Dpy = dpy;
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h->Win = win;
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h->Context = ctx;
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h->Angle = 0.0;
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strcpy(h->Version, (char *) glGetString(GL_VERSION));
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strcpy(h->Vendor, (char *) glGetString(GL_VENDOR));
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strcpy(h->Renderer, (char *) glGetString(GL_RENDERER));
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NumHeads++;
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return &Heads[NumHeads-1];
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}
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}
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static void
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DestroyHeads(void)
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{
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int i;
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for (i = 0; i < NumHeads; i++) {
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XDestroyWindow(Heads[i].Dpy, Heads[i].Win);
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glXDestroyContext(Heads[i].Dpy, Heads[i].Context);
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XCloseDisplay(Heads[i].Dpy);
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}
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}
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static void
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Redraw(struct head *h)
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{
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if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
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Error(h->DisplayName, "glXMakeCurrent failed");
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printf("glXMakeCurrent failed in Redraw()\n");
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return;
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}
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h->Angle += 1.0;
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glShadeModel(GL_FLAT);
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glClearColor(0.5, 0.5, 0.5, 1.0);
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glClear(GL_COLOR_BUFFER_BIT);
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/* draw green triangle */
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glColor3f(0.0, 1.0, 0.0);
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glPushMatrix();
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glRotatef(h->Angle, 0, 0, 1);
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glBegin(GL_TRIANGLES);
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glTexCoord2f(0.5, 1.0); glVertex2f(0, 0.8);
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glTexCoord2f(0.0, 0.0); glVertex2f(-0.8, -0.7);
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glTexCoord2f(1.0, 0.0); glVertex2f(0.8, -0.7);
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glEnd();
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glPopMatrix();
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if (!SwapSeparate)
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glXSwapBuffers(h->Dpy, h->Win);
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}
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static void
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Swap(struct head *h)
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{
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glXSwapBuffers(h->Dpy, h->Win);
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}
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static void
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Resize(const struct head *h, unsigned int width, unsigned int height)
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{
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if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
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Error(h->DisplayName, "glXMakeCurrent failed in Resize()");
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return;
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}
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glFlush();
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
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}
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static void
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EventLoop(void)
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{
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while (1) {
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int i;
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for (i = 0; i < NumHeads; i++) {
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struct head *h = &Heads[i];
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while (XPending(h->Dpy) > 0) {
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XEvent event;
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XNextEvent(h->Dpy, &event);
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if (event.xany.window == h->Win) {
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switch (event.type) {
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case Expose:
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Redraw(h);
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if (SwapSeparate)
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Swap(h);
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break;
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case ConfigureNotify:
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Resize(h, event.xconfigure.width, event.xconfigure.height);
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break;
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case KeyPress:
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{
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char buf[100];
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KeySym keySym;
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XComposeStatus stat;
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XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
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switch (keySym) {
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case XK_Escape:
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exit(0);
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break;
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case XK_d:
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case XK_D:
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printf("Delete Texture in window %d\n", i);
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glXMakeCurrent(h->Dpy, h->Win, h->Context);
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glDeleteTextures(1, &TexObj);
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break;
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case XK_u:
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case XK_U:
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printf("Unbind Texture in window %d\n", i);
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glXMakeCurrent(h->Dpy, h->Win, h->Context);
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glBindTexture(GL_TEXTURE_2D, 0);
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break;
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}
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}
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break;
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default:
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/*no-op*/ ;
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}
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}
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else {
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printf("window mismatch\n");
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}
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}
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}
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/* redraw all windows */
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for (i = 0; i < NumHeads; i++) {
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Redraw(&Heads[i]);
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}
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/* swapbuffers on all windows, if not already done */
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if (SwapSeparate) {
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for (i = 0; i < NumHeads; i++) {
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Swap(&Heads[i]);
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}
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}
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usleep(1);
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}
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}
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static void
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PrintInfo(const struct head *h)
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{
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printf("Name: %s\n", h->DisplayName);
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printf(" Display: %p\n", (void *) h->Dpy);
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printf(" Window: 0x%x\n", (int) h->Win);
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printf(" Context: 0x%lx\n", (long) h->Context);
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printf(" GL_VERSION: %s\n", h->Version);
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printf(" GL_VENDOR: %s\n", h->Vendor);
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printf(" GL_RENDERER: %s\n", h->Renderer);
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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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char *dpyName = NULL;
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int i;
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if (argc == 1) {
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printf("manywin: open N simultaneous glx windows\n");
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printf("Usage:\n");
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printf(" manywin [-s] numWindows\n");
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printf("Options:\n");
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printf(" -s = swap immediately after drawing (see src code)\n");
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printf("Example:\n");
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printf(" manywin 10\n");
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return 0;
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}
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else {
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int n = 3;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-s") == 0) {
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SwapSeparate = GL_FALSE;
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}
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else if (strcmp(argv[i], "-display") == 0 && i < argc) {
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dpyName = argv[i+1];
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i++;
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}
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else {
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n = atoi(argv[i]);
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}
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}
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if (n < 1)
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n = 1;
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printf("%d windows\n", n);
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for (i = 0; i < n; i++) {
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char name[100];
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struct head *h;
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sprintf(name, "%d", i);
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h = AddHead(dpyName, name);
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if (h) {
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PrintInfo(h);
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}
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}
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}
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EventLoop();
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DestroyHeads();
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return 0;
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}
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