329 lines
8.2 KiB
C
329 lines
8.2 KiB
C
/*
|
|
* Mesa 3-D graphics library
|
|
* Version: 6.5.2
|
|
*
|
|
* Copyright (C) 1999-2006 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.
|
|
*/
|
|
|
|
|
|
/*
|
|
* This program opens two GLX windows, renders into one and uses
|
|
* glCopyPixels to copy the image from the first window into the
|
|
* second by means of the GLX 1.3 function glxMakeContextCurrent().
|
|
* This function works just like the glXMakeCurrentReadSGI() function
|
|
* in the GLX_SGI_make_current_read extension.
|
|
*/
|
|
|
|
|
|
#define GL_GLEXT_PROTOTYPES
|
|
#define GLX_GLXEXT_PROTOTYPES
|
|
#include <GL/gl.h>
|
|
#include <GL/glx.h>
|
|
#include <X11/keysym.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
|
|
#ifdef GLX_VERSION_1_3
|
|
|
|
|
|
static Display *Dpy;
|
|
static int ScrNum;
|
|
static GLXContext Context;
|
|
static Window Win[2]; /* Win[0] = source, Win[1] = dest */
|
|
static GLint Width[2], Height[2];
|
|
static GLboolean TestClipping = GL_FALSE;
|
|
static GLfloat Angle = 0.0;
|
|
|
|
static GLboolean DrawFront = GL_FALSE;
|
|
|
|
PFNGLXMAKECURRENTREADSGIPROC make_context_current = NULL;
|
|
|
|
static Window
|
|
CreateWindow(Display *dpy, int scrnum, XVisualInfo *visinfo,
|
|
int xpos, int ypos, int width, int height,
|
|
const char *name)
|
|
{
|
|
Window win;
|
|
XSetWindowAttributes attr;
|
|
unsigned long mask;
|
|
Window root;
|
|
|
|
root = RootWindow(dpy, scrnum);
|
|
|
|
/* window attributes */
|
|
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) {
|
|
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);
|
|
|
|
XMapWindow(dpy, win);
|
|
}
|
|
return win;
|
|
}
|
|
|
|
|
|
static void
|
|
Redraw(void)
|
|
{
|
|
/* make the first window the current one */
|
|
if (! (*make_context_current)(Dpy, Win[0], Win[0], Context)) {
|
|
printf("glXMakeContextCurrent failed in Redraw()\n");
|
|
return;
|
|
}
|
|
|
|
Angle += 1.0;
|
|
|
|
if (DrawFront) {
|
|
glDrawBuffer(GL_FRONT);
|
|
glReadBuffer(GL_FRONT);
|
|
}
|
|
else {
|
|
glDrawBuffer(GL_BACK);
|
|
glReadBuffer(GL_BACK);
|
|
}
|
|
|
|
glViewport(0, 0, Width[0], Height[0]);
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
|
|
glShadeModel(GL_FLAT);
|
|
glClearColor(0.5, 0.5, 0.5, 0.0);
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
/* draw blue quad */
|
|
glColor3f(0.3, 0.3, 1.0);
|
|
glPushMatrix();
|
|
glRotatef(Angle, 0, 0, 1);
|
|
glBegin(GL_POLYGON);
|
|
glVertex2f(-0.5, -0.25);
|
|
glVertex2f( 0.5, -0.25);
|
|
glVertex2f( 0.5, 0.25);
|
|
glVertex2f(-0.5, 0.25);
|
|
glEnd();
|
|
glPopMatrix();
|
|
|
|
if (DrawFront)
|
|
glFinish();
|
|
else
|
|
glXSwapBuffers(Dpy, Win[0]);
|
|
|
|
|
|
/* copy image from window 0 to window 1 */
|
|
if (!(*make_context_current)(Dpy, Win[1], Win[0], Context)) {
|
|
printf("glXMakeContextCurrent failed in Redraw()\n");
|
|
return;
|
|
}
|
|
|
|
/* copy the image between windows */
|
|
glClearColor(0.0, 0.0, 0.0, 0.0);
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
if (TestClipping) {
|
|
glWindowPos2iARB(-2, -2);
|
|
glCopyPixels(-2, -2, Width[0] + 4, Height[0] + 4, GL_COLOR);
|
|
}
|
|
else {
|
|
glWindowPos2iARB(0, 0);
|
|
glCopyPixels(0, 0, Width[0], Height[0], GL_COLOR);
|
|
}
|
|
|
|
if (DrawFront)
|
|
glFinish();
|
|
else
|
|
glXSwapBuffers(Dpy, Win[1]);
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
Resize(Window win, unsigned int width, unsigned int height)
|
|
{
|
|
int i;
|
|
if (win == Win[0]) {
|
|
i = 0;
|
|
}
|
|
else {
|
|
i = 1;
|
|
}
|
|
Width[i] = width;
|
|
Height[i] = height;
|
|
if (!glXMakeCurrent(Dpy, Win[i], Context)) {
|
|
printf("glXMakeCurrent failed in Resize()\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
EventLoop(void)
|
|
{
|
|
XEvent event;
|
|
while (1) {
|
|
if (XPending(Dpy) > 0) {
|
|
XNextEvent( Dpy, &event );
|
|
switch (event.type) {
|
|
case Expose:
|
|
Redraw();
|
|
break;
|
|
case ConfigureNotify:
|
|
Resize(event.xany.window, event.xconfigure.width, event.xconfigure.height);
|
|
break;
|
|
case KeyPress:
|
|
{
|
|
char buf[100];
|
|
KeySym keySym;
|
|
XComposeStatus stat;
|
|
XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
|
|
if (keySym == XK_Escape) {
|
|
/* exit */
|
|
return;
|
|
}
|
|
else if (buf[0] == 'f') {
|
|
DrawFront = !DrawFront;
|
|
printf("Drawing to %s buffer\n",
|
|
DrawFront ? "GL_FRONT" : "GL_BACK");
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
/*no-op*/ ;
|
|
}
|
|
}
|
|
else {
|
|
/* animate */
|
|
Redraw();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
Init(void)
|
|
{
|
|
XVisualInfo *visinfo;
|
|
int attrib[] = { GLX_RGBA,
|
|
GLX_RED_SIZE, 1,
|
|
GLX_GREEN_SIZE, 1,
|
|
GLX_BLUE_SIZE, 1,
|
|
GLX_DOUBLEBUFFER,
|
|
None };
|
|
int major, minor;
|
|
|
|
Dpy = XOpenDisplay(NULL);
|
|
if (!Dpy) {
|
|
printf("Couldn't open default display!\n");
|
|
exit(1);
|
|
}
|
|
|
|
ScrNum = DefaultScreen(Dpy);
|
|
|
|
glXQueryVersion(Dpy, &major, &minor);
|
|
|
|
if (major * 100 + minor >= 103) {
|
|
make_context_current = (PFNGLXMAKECURRENTREADSGIPROC)
|
|
glXGetProcAddressARB( (GLubyte *) "glXMakeContextCurrent" );
|
|
}
|
|
else {
|
|
const char * const glxExtensions = glXQueryExtensionsString(Dpy, ScrNum);
|
|
const char * ext = strstr( glxExtensions, "GLX_SGI_make_current_read" );
|
|
const size_t len = strlen( "GLX_SGI_make_current_read" );
|
|
|
|
if ( (ext != NULL)
|
|
&& ((ext[len] == ' ') || (ext[len] == '\0')) ) {
|
|
make_context_current = (PFNGLXMAKECURRENTREADSGIPROC)
|
|
glXGetProcAddressARB( (GLubyte *) "glXMakeCurrentReadSGI" );
|
|
}
|
|
}
|
|
|
|
if (make_context_current == NULL) {
|
|
fprintf(stderr, "Sorry, this program requires either GLX 1.3 "
|
|
"or GLX_SGI_make_current_read.\n");
|
|
exit(1);
|
|
}
|
|
|
|
visinfo = glXChooseVisual(Dpy, ScrNum, attrib);
|
|
if (!visinfo) {
|
|
printf("Unable to find RGB, double-buffered visual\n");
|
|
exit(1);
|
|
}
|
|
|
|
Context = glXCreateContext(Dpy, visinfo, NULL, True);
|
|
if (!Context) {
|
|
printf("Couldn't create GLX context\n");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
Win[0] = CreateWindow(Dpy, ScrNum, visinfo,
|
|
0, 0, 300, 300, "source window");
|
|
|
|
Win[1] = CreateWindow(Dpy, ScrNum, visinfo,
|
|
350, 0, 300, 300, "dest window");
|
|
|
|
printf("Press Esc to exit\n");
|
|
printf("Press 'f' to toggle front/back buffer drawing\n");
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
if (argc > 1 && strcmp(argv[1], "-clip") == 0)
|
|
TestClipping = GL_TRUE;
|
|
Init();
|
|
EventLoop();
|
|
return 0;
|
|
}
|
|
|
|
|
|
#else
|
|
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
printf("This program requires GLX 1.3!\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
#endif /* GLX_VERSION_1_3 */
|