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-rw-r--r--tests/OffscreenContext.cc244
1 files changed, 123 insertions, 121 deletions
diff --git a/tests/OffscreenContext.cc b/tests/OffscreenContext.cc
index 9d6fe7b..4b66501 100644
--- a/tests/OffscreenContext.cc
+++ b/tests/OffscreenContext.cc
@@ -25,7 +25,7 @@ struct OffscreenContext
{
GLXContext openGLContext;
Display *xdisplay;
- Window xwindow;
+ Window xwindow;
int width;
int height;
fbo_t *fbo;
@@ -37,7 +37,7 @@ void offscreen_context_init(OffscreenContext &ctx, int width, int height)
ctx.height = height;
ctx.openGLContext = NULL;
ctx.xdisplay = NULL;
- ctx.xwindow = NULL;
+ ctx.xwindow = NULL;
ctx.fbo = NULL;
}
@@ -45,124 +45,126 @@ static XErrorHandler original_xlib_handler = (XErrorHandler) NULL;
static bool XCreateWindow_failed = false;
static int XCreateWindow_error(Display *dpy, XErrorEvent *event)
{
- cerr << "XCreateWindow failed: XID: " << event->resourceid
- << " request: " << (int)event->request_code
- << " minor: " << (int)event->minor_code << "\n";
- char description[1024];
- XGetErrorText( dpy, event->error_code, description, 1023 );
- cerr << " error message: " << description << "\n";
- XCreateWindow_failed = true;
- return 0;
+ cerr << "XCreateWindow failed: XID: " << event->resourceid
+ << " request: " << (int)event->request_code
+ << " minor: " << (int)event->minor_code << "\n";
+ char description[1024];
+ XGetErrorText( dpy, event->error_code, description, 1023 );
+ cerr << " error message: " << description << "\n";
+ XCreateWindow_failed = true;
+ return 0;
}
bool create_glx_dummy_window(OffscreenContext &ctx)
{
- /*
- create a dummy X window without showing it. (without 'mapping' it)
- save information to the ctx
-
- based on http://www.opengl.org/sdk/docs/man/xhtml/glXIntro.xml
- which was originally Copyright © 1991-2006 Silicon Graphics, Inc.
- licensed under the SGI Free Software B License.
- See http://oss.sgi.com/projects/FreeB/.
-
- also based on glxgears.c by Brian Paul from mesa-demos (mesa3d.org)
-
- purposely does not use glxCreateWindow, to avoid Mesa warnings.
-
- this will alter ctx.openGLContext and ctx.xwindow if successfull
- */
-
- int attributes[] = {
- GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
- GLX_RENDER_TYPE, GLX_RGBA_BIT,
- GLX_RED_SIZE, 1,
- GLX_GREEN_SIZE, 1,
- GLX_BLUE_SIZE, 1,
- None
- };
-
- Display *dpy = ctx.xdisplay;
-
- int numReturned = 0;
- GLXFBConfig *fbconfigs = glXChooseFBConfig( dpy, DefaultScreen(dpy), attributes, &numReturned );
- if ( fbconfigs == NULL ) {
- cerr << "glXChooseFBConfig failed\n";
- return false;
- }
-
- XVisualInfo *visinfo = glXGetVisualFromFBConfig( dpy, fbconfigs[0] );
- if ( visinfo == NULL ) {
- cerr << "glXGetVisualFromFBConfig failed\n";
- XFree( fbconfigs );
- return false;
- }
-
- original_xlib_handler = XSetErrorHandler( XCreateWindow_error );
- Window xWin = XCreateSimpleWindow( dpy, DefaultRootWindow(dpy), 0,0,10,10, 0,0,0 );
- // can't depend on xWin==NULL at failure. catch Xlib Errors instead.
- XSync( dpy, false );
- if ( XCreateWindow_failed ) {
- XFree( visinfo );
- XFree( fbconfigs );
- return false;
- }
- XSetErrorHandler( original_xlib_handler );
- // do not call XMapWindow - keep the window hidden
-
- GLXContext context = glXCreateNewContext( dpy, fbconfigs[0], GLX_RGBA_TYPE, NULL, True );
- if ( context == NULL ) {
- cerr << "glXGetVisualFromFBConfig failed\n";
- XDestroyWindow( dpy, xWin );
- XFree( visinfo );
- XFree( fbconfigs );
- return false;
- }
-
- if (!glXMakeContextCurrent( dpy, xWin, xWin, context )) {
- cerr << "glXMakeContextCurrent failed\n";
- XDestroyWindow( dpy, xWin );
- glXDestroyContext( dpy, context );
- XFree( visinfo );
- XFree( fbconfigs );
- return false;
- }
+ /*
+ create a dummy X window without showing it. (without 'mapping' it)
+ save information to the ctx
+
+ based on http://www.opengl.org/sdk/docs/man/xhtml/glXIntro.xml
+ which was originally Copyright © 1991-2006 Silicon Graphics, Inc.
+ licensed under the SGI Free Software B License.
+ See http://oss.sgi.com/projects/FreeB/.
+
+ also based on glxgears.c by Brian Paul from mesa-demos (mesa3d.org)
+
+ purposely does not use glxCreateWindow, to avoid crashes,
+ "failed to create drawable" errors, and Mesa "This is an application bug!"
+ warnings about GLX 1.3.
+
+ this function will alter ctx.openGLContext and ctx.xwindow if successfull
+ */
+
+ int attributes[] = {
+ GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
+ GLX_RENDER_TYPE, GLX_RGBA_BIT,
+ GLX_RED_SIZE, 1,
+ GLX_GREEN_SIZE, 1,
+ GLX_BLUE_SIZE, 1,
+ None
+ };
+
+ Display *dpy = ctx.xdisplay;
+
+ int numReturned = 0;
+ GLXFBConfig *fbconfigs = glXChooseFBConfig( dpy, DefaultScreen(dpy), attributes, &numReturned );
+ if ( fbconfigs == NULL ) {
+ cerr << "glXChooseFBConfig failed\n";
+ return false;
+ }
+
+ XVisualInfo *visinfo = glXGetVisualFromFBConfig( dpy, fbconfigs[0] );
+ if ( visinfo == NULL ) {
+ cerr << "glXGetVisualFromFBConfig failed\n";
+ XFree( fbconfigs );
+ return false;
+ }
+
+ original_xlib_handler = XSetErrorHandler( XCreateWindow_error );
+ Window xWin = XCreateSimpleWindow( dpy, DefaultRootWindow(dpy), 0,0,10,10, 0,0,0 );
+ // can't depend on xWin==NULL at failure. catch Xlib Errors instead.
+ XSync( dpy, false );
+ if ( XCreateWindow_failed ) {
+ XFree( visinfo );
+ XFree( fbconfigs );
+ return false;
+ }
+ XSetErrorHandler( original_xlib_handler );
+ // do not call XMapWindow - keep the window hidden
+
+ GLXContext context = glXCreateNewContext( dpy, fbconfigs[0], GLX_RGBA_TYPE, NULL, True );
+ if ( context == NULL ) {
+ cerr << "glXGetVisualFromFBConfig failed\n";
+ XDestroyWindow( dpy, xWin );
+ XFree( visinfo );
+ XFree( fbconfigs );
+ return false;
+ }
+
+ if (!glXMakeContextCurrent( dpy, xWin, xWin, context )) {
+ cerr << "glXMakeContextCurrent failed\n";
+ XDestroyWindow( dpy, xWin );
+ glXDestroyContext( dpy, context );
+ XFree( visinfo );
+ XFree( fbconfigs );
+ return false;
+ }
ctx.openGLContext = context;
- ctx.xwindow = xWin;
+ ctx.xwindow = xWin;
- XFree( visinfo );
- XFree( fbconfigs );
+ XFree( visinfo );
+ XFree( fbconfigs );
- return true;
+ return true;
}
Bool create_glx_dummy_context(OffscreenContext &ctx)
{
- // This will alter ctx.openGLContext and ctx.xdisplay and ctx.xwindow if successfull
- int major;
- int minor;
- Bool result = False;
-
- ctx.xdisplay = XOpenDisplay( NULL );
- if ( ctx.xdisplay == NULL ) {
- cerr << "Unable to open a connection to the X server\n";
- return False;
- }
-
- glXQueryVersion(ctx.xdisplay, &major, &minor);
-
- if ( major==1 && minor<=2 && glXGetVisualFromFBConfig==NULL ) {
- cerr << "Error: GLX version 1.3 functions missing. "
- << "Your GLX version: " << major << "." << minor << endl;
- XCloseDisplay( ctx.xdisplay );
- } else {
- // if glXGetVisualFromFBConfig exists, pretend we have >=1.3
- result = create_glx_dummy_window(ctx);
- }
-
- return result;
+ // This will alter ctx.openGLContext and ctx.xdisplay and ctx.xwindow if successfull
+ int major;
+ int minor;
+ Bool result = False;
+
+ ctx.xdisplay = XOpenDisplay( NULL );
+ if ( ctx.xdisplay == NULL ) {
+ cerr << "Unable to open a connection to the X server\n";
+ return False;
+ }
+
+ glXQueryVersion(ctx.xdisplay, &major, &minor);
+
+ if ( major==1 && minor<=2 && glXGetVisualFromFBConfig==NULL ) {
+ cerr << "Error: GLX version 1.3 functions missing. "
+ << "Your GLX version: " << major << "." << minor << endl;
+ } else {
+ // if glXGetVisualFromFBConfig exists, pretend we have >=1.3
+ result = create_glx_dummy_window(ctx);
+ }
+
+ if (!result) XCloseDisplay( ctx.xdisplay );
+ return result;
}
void glewCheck() {
@@ -187,11 +189,11 @@ void glewCheck() {
OffscreenContext *create_offscreen_context(int w, int h)
{
OffscreenContext *ctx = new OffscreenContext;
- offscreen_context_init( *ctx, w, h );
+ offscreen_context_init( *ctx, w, h );
- // before an FBO can be setup, a GLX context must be created
+ // before an FBO can be setup, a GLX context must be created
// this call alters ctx->xDisplay and ctx->openGLContext
- // and ctx->xwindow if successfull
+ // and ctx->xwindow if successfull
if (!create_glx_dummy_context( *ctx )) {
return NULL;
}
@@ -209,15 +211,15 @@ OffscreenContext *create_offscreen_context(int w, int h)
bool teardown_offscreen_context(OffscreenContext *ctx)
{
- if (ctx) {
- fbo_unbind(ctx->fbo);
- fbo_delete(ctx->fbo);
- XDestroyWindow( ctx->xdisplay, ctx->xwindow );
- glXDestroyContext( ctx->xdisplay, ctx->openGLContext );
- XCloseDisplay( ctx->xdisplay );
- return true;
- }
- return false;
+ if (ctx) {
+ fbo_unbind(ctx->fbo);
+ fbo_delete(ctx->fbo);
+ XDestroyWindow( ctx->xdisplay, ctx->xwindow );
+ glXDestroyContext( ctx->xdisplay, ctx->openGLContext );
+ XCloseDisplay( ctx->xdisplay );
+ return true;
+ }
+ return false;
}
/*!
@@ -225,7 +227,7 @@ bool teardown_offscreen_context(OffscreenContext *ctx)
*/
bool save_framebuffer(OffscreenContext *ctx, const char *filename)
{
- if (!ctx || !filename) return false;
+ if (!ctx || !filename) return false;
int samplesPerPixel = 4; // R, G, B and A
GLubyte pixels[ctx->width * ctx->height * samplesPerPixel];
glReadPixels(0, 0, ctx->width, ctx->height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
@@ -248,5 +250,5 @@ bool save_framebuffer(OffscreenContext *ctx, const char *filename)
void bind_offscreen_context(OffscreenContext *ctx)
{
- if (ctx) fbo_bind(ctx->fbo);
+ if (ctx) fbo_bind(ctx->fbo);
}
contact: Jan Huwald // Impressum