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