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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2009 Eric Anholt
* Copyright © 2009 Chris Wilson
* Copyright © 2005 Red Hat, Inc
* Copyright © 2015 Samsung Research America, Inc. - Silicon Valley
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Red Hat, Inc.
*
* Contributor(s):
* Carl Worth <cworth@cworth.org>
* Chris Wilson <chris@chris-wilson.co.uk>
* Henry Songn <hsong@sisa.samsung.com>
*/
#include "cairoint.h"
#include "cairo-gl-private.h"
#include "cairo-error-private.h"
#include <dlfcn.h>
typedef struct _cairo_cgl_context {
cairo_gl_context_t base;
CGLContextObj context;
CGLContextObj prev_context;
} cairo_cgl_context_t;
typedef struct _cairo_cgl_surface {
cairo_gl_surface_t base;
CGLContextObj context;
} cairo_cgl_surface_t;
static void *
_cgl_query_current_state (cairo_cgl_context_t * ctx)
{
ctx->prev_context = CGLGetCurrentContext ();
}
static void
_cgl_acquire (void *abstract_ctx)
{
cairo_cgl_context_t *ctx = abstract_ctx;
_cgl_query_current_state (ctx);
if (ctx->prev_context == ctx->context)
return;
_cairo_gl_context_reset (&ctx->base);
CGLLockContext (ctx->context);
CGLSetCurrentContext (ctx->context);
}
static void
_cgl_make_current (void *abstract_ctx, cairo_gl_surface_t *abstract_surface)
{
cairo_cgl_context_t *ctx = abstract_ctx;
cairo_cgl_surface_t *surface = (cairo_cgl_surface_t *) abstract_surface;
/* Set the window as the target of our context. */
if (ctx->context != surface->context) {
CGLLockContext (surface->context);
CGLSetCurrentContext (surface->context);
}
}
static void
_cgl_release (void *abstract_ctx)
{
cairo_cgl_context_t *ctx = abstract_ctx;
if (!ctx->base.thread_aware)
return;
CGLSetCurrentContext (NULL);
CGLUnlockContext (ctx->context);
}
static void
_cgl_swap_buffers (void *abstract_ctx,
cairo_gl_surface_t *abstract_surface)
{
cairo_cgl_context_t *ctx = abstract_ctx;
cairo_cgl_surface_t *surface = (cairo_cgl_surface_t *)abstract_surface;
/* is it possible to have different context? */
if (ctx->context == surface->context)
CGLFlushDrawable (surface->context);
}
static void
_cgl_destroy (void *abstract_ctx)
{
cairo_cgl_context_t *ctx = abstract_ctx;
CGLSetCurrentContext (NULL);
CGLReleaseContext (ctx->context);
CGLUnlockContext (ctx->context);
}
static cairo_gl_generic_func_t
_cairo_cgl_get_proc_address (void *data, const char *name)
{
return dlsym (RTLD_DEFAULT, name);
}
cairo_device_t *
cairo_cgl_device_create (CGLContextObj context)
{
cairo_cgl_context_t *ctx;
cairo_status_t status;
ctx = calloc (1, sizeof (cairo_cgl_context_t));
if (unlikely (ctx == NULL))
return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
ctx->context = CGLRetainContext (context);
ctx->base.acquire = _cgl_acquire;
ctx->base.release = _cgl_release;
ctx->base.make_current = _cgl_make_current;
ctx->base.swap_buffers = _cgl_swap_buffers;
ctx->base.destroy = _cgl_destroy;
_cgl_query_current_state (ctx);
if (ctx->context != ctx->prev_context) {
CGLLockContext (ctx->context);
CGLSetCurrentContext (ctx->context);
}
status = _cairo_gl_dispatch_init (&ctx->base.dispatch,
(cairo_gl_get_proc_addr_func_t) _cairo_cgl_get_proc_address,
NULL);
if (unlikely (status)) {
ctx->base.release (ctx);
CGLReleaseContext (ctx->context);
free (ctx);
return _cairo_gl_context_create_in_error (status);
}
status = _cairo_gl_context_init (&ctx->base);
if (unlikely (status)) {
ctx->base.release (ctx);
CGLReleaseContext (ctx->context);
free (ctx);
return _cairo_gl_context_create_in_error (status);
}
ctx->base.release (ctx);
return &ctx->base.base;
}
CGLContextObj
cairo_cgl_device_get_context (cairo_device_t *device)
{
cairo_cgl_context_t *ctx;
if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
_cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
return NULL;
}
ctx = (cairo_cgl_context_t *) device;
return ctx->context;
}
cairo_surface_t *
cairo_gl_surface_create_for_cgl (cairo_device_t *device,
int width,
int height)
{
cairo_cgl_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));
if (width <= 0 || height <= 0)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
surface = calloc (1, sizeof (cairo_cgl_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->context = ((cairo_cgl_context_t *) device)->context;
return &surface->base.base;
}
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