Attachment 37255 Details for Bug 29170 – Test case.

Test case.

twoctx.c (text/plain), 2.57 KB, created by Nick Bowler on 2010-07-20 17:35:33 UTC

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Creator: Nick Bowler

Created: 2010-07-20 17:35:33 UTC

Size: 2.57 KB

patch

obsolete

>/*
> * Copyright (C) 2010 Nick Bowler
> *
> * License WTFPL2: Do What The Fuck You Want To Public License, version 2.
> * This is free software: you are free to do what the fuck you want to.
> * There is NO WARRANTY, to the extent permitted by law.
> *
> * In case the above is not acceptable, you may alternately choose the terms
> * of the MIT license: http://opensource.org/licenses/mit-license.php.
> */
>
>#include <math.h>
>
>#include <X11/Xlib.h>
>#include <GL/gl.h>
>#include <GL/glx.h>
>
>#ifndef M_PI
>#	define M_PI 3.14159265358979323844
>#endif
>
>static void resize(int w, int h)
>{
>	glMatrixMode(GL_PROJECTION);
>	glLoadIdentity();
>	glViewport(0, 0, w, h);
>	glOrtho(-1.2, 1.2, -1.2, 1.2, -1, 1);
>	glMatrixMode(GL_MODELVIEW);
>}
>
>static void render(double theta)
>{
>	glClear(GL_COLOR_BUFFER_BIT);
>
>	glBegin(GL_LINE_LOOP);
>	glVertex2d(0, 0);
>	glVertex2d(cos(theta-0.1), sin(theta-0.1));
>	glVertex2d(cos(theta+0.1), sin(theta+0.1));
>	glEnd();
>
>	glFinish();
>}
>
>int main(int argc, char **argv)
>{
>	int rgb_attribs[] = {
>		GLX_RGBA,
>		GLX_RED_SIZE, 1,
>		GLX_GREEN_SIZE, 1,
>		GLX_BLUE_SIZE, 1,
>		GLX_DOUBLEBUFFER,
>		None
>	};
>	Display *dpy;
>	XVisualInfo *vi;
>	GLXContext ctx1, ctx2;
>	Window win, win1, win2;
>	XSetWindowAttributes attr;
>	double theta = 0;
>
>	dpy = XOpenDisplay(NULL);
>	vi = glXChooseVisual(dpy, DefaultScreen(dpy), rgb_attribs);
>
>	attr.colormap = XCreateColormap(dpy, RootWindow (dpy, vi->screen),
>	                                vi->visual, AllocNone);
>	win = XCreateWindow(dpy, DefaultRootWindow(dpy),
>			     0, 0, 600, 300, 0,
>			     vi->depth, InputOutput, vi->visual,
>			     CWColormap, &attr);
>	XMapWindow(dpy, win);
>
>	win1 = XCreateWindow(dpy, win, 0, 0, 300, 300, 0, 
>	                     vi->depth, InputOutput, vi->visual,
>	                     CWColormap, &attr);
>	XSelectInput(dpy, win1, ExposureMask);
>	XMapWindow(dpy, win1);
>
>	win2 = XCreateWindow(dpy, win, 300, 0, 300, 300, 0, 
>	                     vi->depth, InputOutput, vi->visual,
>	                     CWColormap, &attr);
>	XSelectInput(dpy, win2, ExposureMask);
>	XMapWindow(dpy, win2);
>
>	ctx1 = glXCreateContext(dpy, vi, NULL, True);
>	ctx2 = glXCreateContext(dpy, vi, NULL, True);
>
>	while (1) {
>		/* discard pending events. */
>		XSync(dpy, True);
>
>		glXMakeCurrent(dpy, win1, ctx1);
>		resize(300, 300);
>		render(theta);
>		glXSwapBuffers(dpy, win1);
>
>		/* recreate context to try and trigger lockup */
>		glXDestroyContext(dpy, ctx2);
>		ctx2 = glXCreateContext(dpy, vi, NULL, True);
>
>		glXMakeCurrent(dpy, win2, ctx2);
>		resize(300, 300);
>		render(-(theta+M_PI));
>		glXSwapBuffers(dpy, win2);
>
>		theta = remainder(theta + M_PI/180, 2*M_PI);
>	}
>
>	return 0;
>}

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