/* * Test sharing of texture objects by two rendering contexts. * In particular, test that changing a texture object in one context * effects the texture in the second context. * * Brian Paul * 30 Apr 2008 * * Copyright (C) 2008 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> #define MAX_CONTEXTS 2 #define TEX_SIZE 32 static const char *DisplayName = NULL; static Display *Dpy; static XVisualInfo *VisInfo; static Window Win; static GLXContext Contexts[MAX_CONTEXTS]; static int WinWidth = 300, WinHeight = 300; static int DrawContext = 0, TexContext = 1; static GLuint TexObj = 0; static GLboolean NewTexture = GL_FALSE; static void Error(const char *msg) { fprintf(stderr, "sharedtex error: %s\n", msg); exit(1); } static void CreateWindow(const char *name) { 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; int xpos = 0, ypos = 0; static int n = 0; scrnum = DefaultScreen(Dpy); root = RootWindow(Dpy, scrnum); VisInfo = glXChooseVisual(Dpy, scrnum, attrib); if (!VisInfo) { Error("Unable to find RGB, double-buffered visual"); } /* window attributes */ xpos = (n % 10) * 100; ypos = (n / 10) * 100; n++; 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, WinWidth, WinHeight, 0, VisInfo->depth, InputOutput, VisInfo->visual, mask, &attr); if (!Win) { Error("Couldn't create window"); } { XSizeHints sizehints; sizehints.x = xpos; sizehints.y = ypos; sizehints.width = WinWidth; sizehints.height = WinHeight; sizehints.flags = USSize | USPosition; XSetNormalHints(Dpy, Win, &sizehints); XSetStandardProperties(Dpy, Win, name, name, None, (char **)NULL, 0, &sizehints); } XMapWindow(Dpy, Win); } /** * Change texture image, using TexContext */ static void ModifyTexture(void) { GLuint tex[TEX_SIZE][TEX_SIZE]; GLuint c0, c1; int i, j; if (Win && !glXMakeCurrent(Dpy, Win, Contexts[TexContext])) { Error("glXMakeCurrent failed"); } /* choose two random colors */ c0 = rand() & 0xffffffff; c1 = rand() & 0xffffffff; for (i = 0; i < TEX_SIZE; i++) { for (j = 0; j < TEX_SIZE; j++) { if (((i / 4) ^ (j / 4)) & 1) { tex[i][j] = c0; } else { tex[i][j] = c1; } } } glBindTexture(GL_TEXTURE_2D, TexObj); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TEX_SIZE, TEX_SIZE, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex); NewTexture = GL_TRUE; } static void InitContext(void) { glGenTextures(1, &TexObj); assert(TexObj); glBindTexture(GL_TEXTURE_2D, TexObj); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glEnable(GL_TEXTURE_2D); printf("GL_RENDERER = %s\n", (char*) glGetString(GL_RENDERER)); } static void Setup(void) { int i; Dpy = XOpenDisplay(DisplayName); if (!Dpy) { Error("Unable to open display"); } CreateWindow("sharedtex"); for (i = 0; i < MAX_CONTEXTS; i++) { GLXContext share = i > 0 ? Contexts[0] : 0; Contexts[i] = glXCreateContext(Dpy, VisInfo, share, True); if (!Contexts[i]) { Error("Unable to create GLX context"); } if (!glXMakeCurrent(Dpy, Win, Contexts[i])) { Error("glXMakeCurrent failed"); } InitContext(); } ModifyTexture(); } /** * Redraw window, using DrawContext */ static void Redraw(void) { static float rot = 0.0; float ar; rot += 1.0; if (Win && !glXMakeCurrent(Dpy, Win, Contexts[DrawContext])) { Error("glXMakeCurrent failed"); } glViewport(0, 0, WinWidth, WinHeight); ar = (float) WinWidth / (float) WinHeight; glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-ar, ar, -1.0, 1.0, -1.0, 1.0); glMatrixMode(GL_MODELVIEW); glShadeModel(GL_FLAT); glClearColor(0.5, 0.5, 0.5, 1.0); glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glRotatef(rot, 0, 0, 1); glScalef(0.7, 0.7, 0.7); if (NewTexture) { /* rebind to get new contents */ glBindTexture(GL_TEXTURE_2D, TexObj); NewTexture = GL_FALSE; } /* draw textured quad */ glBegin(GL_POLYGON); glTexCoord2f( 0.0, 0.0 ); glVertex2f( -1.0, -1.0 ); glTexCoord2f( 1.0, 0.0 ); glVertex2f( 1.0, -1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex2f( 1.0, 1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex2f( -1.0, 1.0 ); glEnd(); glPopMatrix(); if (Win) glXSwapBuffers(Dpy, Win); } static void EventLoop(void) { while (1) { while (XPending(Dpy) > 0) { XEvent event; XNextEvent(Dpy, &event); switch (event.type) { case Expose: Redraw(); break; case ConfigureNotify: WinWidth = event.xconfigure.width; WinHeight = 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: exit(0); break; case XK_t: case XK_T: ModifyTexture(); break; default: ; } } Redraw(); break; default: /*no-op*/ ; } } Redraw(); usleep(10000); } } int main(int argc, char *argv[]) { int i; for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-display") == 0 && i < argc) { DisplayName = argv[i+1]; i++; } } Setup(); printf("Press 't' to change texture image/colors\n"); EventLoop(); return 0; }