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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "cairoint.h"
#include "cairo-gl-private.h"
#include "cairo-error-private.h"
#include <X11/Xutil.h>
/* XXX needs hooking into XCloseDisplay() */
typedef struct _cairo_glx_context {
cairo_gl_context_t base;
Display *display;
Window dummy_window;
GLXContext context;
} cairo_glx_context_t;
typedef struct _cairo_glx_surface {
cairo_gl_surface_t base;
Window win;
} cairo_glx_surface_t;
static void
_glx_acquire (void *abstract_ctx)
{
cairo_glx_context_t *ctx = abstract_ctx;
GLXDrawable current_drawable;
if (ctx->base.current_target == NULL ||
_cairo_gl_surface_is_texture (ctx->base.current_target)) {
current_drawable = ctx->dummy_window;
} else {
cairo_glx_surface_t *surface = (cairo_glx_surface_t *) ctx->base.current_target;
current_drawable = surface->win;
}
glXMakeCurrent (ctx->display, current_drawable, ctx->context);
}
static void
_glx_make_current (void *abstract_ctx, cairo_gl_surface_t *abstract_surface)
{
cairo_glx_context_t *ctx = abstract_ctx;
cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
/* Set the window as the target of our context. */
glXMakeCurrent (ctx->display, surface->win, ctx->context);
}
static void
_glx_release (void *abstract_ctx)
{
cairo_glx_context_t *ctx = abstract_ctx;
glXMakeCurrent (ctx->display, None, None);
}
static void
_glx_swap_buffers (void *abstract_ctx,
cairo_gl_surface_t *abstract_surface)
{
cairo_glx_context_t *ctx = abstract_ctx;
cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
glXSwapBuffers (ctx->display, surface->win);
}
static void
_glx_destroy (void *abstract_ctx)
{
cairo_glx_context_t *ctx = abstract_ctx;
if (ctx->dummy_window != None)
XDestroyWindow (ctx->display, ctx->dummy_window);
glXMakeCurrent (ctx->display, 0, 0);
}
static cairo_status_t
_glx_dummy_ctx (Display *dpy, GLXContext gl_ctx, Window *dummy)
{
int attr[3] = { GLX_FBCONFIG_ID, 0, None };
GLXFBConfig *config;
XVisualInfo *vi;
Colormap cmap;
XSetWindowAttributes swa;
Window win = None;
int cnt;
/* Create a dummy window created for the target GLX context that we can
* use to query the available GL/GLX extensions.
*/
glXQueryContext (dpy, gl_ctx, GLX_FBCONFIG_ID, &attr[1]);
cnt = 0;
config = glXChooseFBConfig (dpy, DefaultScreen (dpy), attr, &cnt);
if (unlikely (cnt == 0))
return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
vi = glXGetVisualFromFBConfig (dpy, config[0]);
XFree (config);
if (unlikely (vi == NULL))
return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
cmap = XCreateColormap (dpy,
RootWindow (dpy, vi->screen),
vi->visual,
AllocNone);
swa.colormap = cmap;
swa.border_pixel = 0;
win = XCreateWindow (dpy, RootWindow (dpy, vi->screen),
-1, -1, 1, 1, 0,
vi->depth,
InputOutput,
vi->visual,
CWBorderPixel | CWColormap, &swa);
XFreeColormap (dpy, cmap);
XFree (vi);
XFlush (dpy);
if (unlikely (! glXMakeCurrent (dpy, win, gl_ctx))) {
XDestroyWindow (dpy, win);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
*dummy = win;
return CAIRO_STATUS_SUCCESS;
}
cairo_device_t *
cairo_glx_device_create (Display *dpy, GLXContext gl_ctx)
{
cairo_glx_context_t *ctx;
cairo_status_t status;
Window dummy = None;
status = _glx_dummy_ctx (dpy, gl_ctx, &dummy);
if (unlikely (status))
return _cairo_gl_context_create_in_error (status);
ctx = calloc (1, sizeof (cairo_glx_context_t));
if (unlikely (ctx == NULL))
return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
ctx->display = dpy;
ctx->dummy_window = dummy;
ctx->context = gl_ctx;
ctx->base.acquire = _glx_acquire;
ctx->base.release = _glx_release;
ctx->base.make_current = _glx_make_current;
ctx->base.swap_buffers = _glx_swap_buffers;
ctx->base.destroy = _glx_destroy;
status = _cairo_gl_context_init (&ctx->base);
if (unlikely (status)) {
free (ctx);
return _cairo_gl_context_create_in_error (status);
}
ctx->base.release (ctx);
return &ctx->base.base;
}
Display *
cairo_glx_device_get_display (cairo_device_t *device)
{
cairo_glx_context_t *ctx;
if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
_cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
return NULL;
}
ctx = (cairo_glx_context_t *) device;
return ctx->display;
}
GLXContext
cairo_glx_device_get_context (cairo_device_t *device)
{
cairo_glx_context_t *ctx;
if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
_cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
return NULL;
}
ctx = (cairo_glx_context_t *) device;
return ctx->context;
}
cairo_surface_t *
cairo_gl_surface_create_for_window (cairo_device_t *device,
Window win,
int width,
int height)
{
cairo_glx_surface_t *surface;
if (unlikely (device->status))
return _cairo_surface_create_in_error (device->status);
if (device->backend->type != CAIRO_DEVICE_TYPE_GL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
surface = calloc (1, sizeof (cairo_glx_surface_t));
if (unlikely (surface == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
_cairo_gl_surface_init (device, &surface->base,
CAIRO_CONTENT_COLOR_ALPHA, width, height);
surface->win = win;
return &surface->base.base;
}
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