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boilerplate: Exercise manual double-buffering to a window

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Shouldn't possibly go wrong, but the mix of fbo and Window might prove
interesting.
This commit is contained in:
Chris Wilson 2010-05-16 10:15:42 +01:00
parent 605be31823
commit 63062511f6
1 changed files with 117 additions and 0 deletions
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117
boilerplate/cairo-boilerplate-gl.c
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@ -37,6 +37,8 @@
#include <X11/X.h>
#include <X11/Xutil.h> /* for XDestroyImage */
static const cairo_user_data_key_t gl_closure_key;
typedef struct _gl_target_closure {
Display *dpy;
int screen;
@ -222,9 +224,111 @@ _cairo_boilerplate_gl_create_window (const char *name,
return surface;
}
static cairo_surface_t *
_cairo_boilerplate_gl_create_window_db (const char *name,
cairo_content_t content,
double width,
double height,
double max_width,
double max_height,
cairo_boilerplate_mode_t mode,
int id,
void **closure)
{
int rgba_attribs[] = { GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_ALPHA_SIZE, 1,
GLX_DOUBLEBUFFER,
None };
XVisualInfo *vi;
GLXContext ctx;
gl_target_closure_t *gltc;
cairo_surface_t *surface;
Display *dpy;
XSetWindowAttributes attr;
cairo_status_t status;
gltc = calloc (1, sizeof (gl_target_closure_t));
*closure = gltc;
if (width == 0)
width = 1;
if (height == 0)
height = 1;
dpy = XOpenDisplay (NULL);
gltc->dpy = dpy;
if (!gltc->dpy) {
fprintf (stderr, "Failed to open display: %s\n", XDisplayName(0));
free (gltc);
return NULL;
}
if (mode == CAIRO_BOILERPLATE_MODE_TEST)
XSynchronize (gltc->dpy, 1);
vi = glXChooseVisual (dpy, DefaultScreen (dpy), rgba_attribs);
if (vi == NULL) {
fprintf (stderr, "Failed to create RGBA, double-buffered visual\n");
XCloseDisplay (dpy);
free (gltc);
return NULL;
}
attr.colormap = XCreateColormap (dpy,
RootWindow (dpy, vi->screen),
vi->visual,
AllocNone);
attr.border_pixel = 0;
attr.override_redirect = True;
gltc->drawable = XCreateWindow (dpy, DefaultRootWindow (dpy), 0, 0,
width, height, 0, vi->depth,
InputOutput, vi->visual,
CWOverrideRedirect | CWBorderPixel | CWColormap,
&attr);
XMapWindow (dpy, gltc->drawable);
ctx = glXCreateContext (dpy, vi, NULL, True);
XFree (vi);
gltc->ctx = ctx;
gltc->device = cairo_glx_device_create (dpy, ctx);
gltc->surface = cairo_gl_surface_create_for_window (gltc->device,
gltc->drawable,
ceil (width),
ceil (height));
surface = cairo_surface_create_similar (gltc->surface, content, width, height);
status = cairo_surface_set_user_data (surface, &gl_closure_key, gltc, NULL);
if (status == CAIRO_STATUS_SUCCESS)
return surface;
cairo_surface_destroy (surface);
_cairo_boilerplate_gl_cleanup (gltc);
return cairo_boilerplate_surface_create_in_error (status);
}
static cairo_status_t
_cairo_boilerplate_gl_finish_window (cairo_surface_t *surface)
{
gl_target_closure_t *gltc = cairo_surface_get_user_data (surface,
&gl_closure_key);
if (gltc != NULL && gltc->surface != NULL) {
cairo_t *cr;
cr = cairo_create (gltc->surface);
cairo_surface_set_device_offset (surface, 0, 0);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
cairo_destroy (cr);
surface = gltc->surface;
}
cairo_gl_surface_swapbuffers (surface);
return CAIRO_STATUS_SUCCESS;
}
@ -357,6 +461,19 @@ static const cairo_boilerplate_target_t targets[] = {
_cairo_boilerplate_gl_synchronize,
FALSE, FALSE, FALSE
},
{
"gl-window&", "gl", NULL, NULL,
CAIRO_SURFACE_TYPE_GL, CAIRO_CONTENT_COLOR_ALPHA, 1,
"cairo_gl_surface_create_for_window",
_cairo_boilerplate_gl_create_window_db,
NULL,
_cairo_boilerplate_gl_finish_window,
_cairo_boilerplate_get_image_surface,
cairo_surface_write_to_png,
_cairo_boilerplate_gl_cleanup,
_cairo_boilerplate_gl_synchronize,
FALSE, FALSE, FALSE
},
#if CAIRO_HAS_EGL_FUNCTIONS
{
"egl", "gl", NULL, NULL,