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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
*
* 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>
*/
#include "cairoint.h"
#include "cairo-gl-private.h"
#include "cairo-error-private.h"
typedef struct _cairo_egl_context {
cairo_gl_context_t base;
EGLDisplay display;
EGLContext context;
EGLSurface dummy_surface;
} cairo_egl_context_t;
typedef struct _cairo_egl_surface {
cairo_gl_surface_t base;
EGLSurface egl;
} cairo_egl_surface_t;
static void
_egl_acquire (void *abstract_ctx)
{
cairo_egl_context_t *ctx = abstract_ctx;
EGLSurface current_surface;
if (ctx->base.current_target == NULL ||
_cairo_gl_surface_is_texture (ctx->base.current_target)) {
current_surface = ctx->dummy_surface;
} else {
cairo_egl_surface_t *surface = (cairo_egl_surface_t *) ctx->base.current_target;
current_surface = surface->egl ;
}
eglMakeCurrent (ctx->display,
ctx->dummy_surface, ctx->dummy_surface, ctx->context);
}
static void
_egl_release (void *abstract_ctx)
{
cairo_egl_context_t *ctx = abstract_ctx;
eglMakeCurrent (ctx->display,
EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
}
static void
_egl_make_current (void *abstract_ctx,
cairo_gl_surface_t *abstract_surface)
{
cairo_egl_context_t *ctx = abstract_ctx;
cairo_egl_surface_t *surface = (cairo_egl_surface_t *) abstract_surface;
eglMakeCurrent(ctx->display, surface->egl, surface->egl, ctx->context);
}
static void
_egl_swap_buffers (void *abstract_ctx,
cairo_gl_surface_t *abstract_surface)
{
cairo_egl_context_t *ctx = abstract_ctx;
cairo_egl_surface_t *surface = (cairo_egl_surface_t *) abstract_surface;
eglSwapBuffers (ctx->display, surface->egl);
}
static void
_egl_destroy (void *abstract_ctx)
{
cairo_egl_context_t *ctx = abstract_ctx;
eglMakeCurrent (ctx->display,
EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
eglDestroySurface (ctx->display, ctx->dummy_surface);
}
static cairo_bool_t
_egl_make_current_surfaceless(cairo_egl_context_t *ctx)
{
const char *extensions;
extensions = eglQueryString(ctx->display, EGL_EXTENSIONS);
if (!strstr(extensions, "EGL_KHR_surfaceless_opengl"))
return FALSE;
if (!eglMakeCurrent(ctx->display,
EGL_NO_SURFACE, EGL_NO_SURFACE, ctx->context))
return FALSE;
return TRUE;
}
cairo_device_t *
cairo_egl_device_create (EGLDisplay dpy, EGLContext egl)
{
cairo_egl_context_t *ctx;
cairo_status_t status;
int attribs[] = {
EGL_WIDTH, 1,
EGL_HEIGHT, 1,
EGL_NONE,
};
EGLConfig *configs;
EGLint numConfigs;
ctx = calloc (1, sizeof (cairo_egl_context_t));
if (unlikely (ctx == NULL))
return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
ctx->display = dpy;
ctx->context = egl;
ctx->base.acquire = _egl_acquire;
ctx->base.release = _egl_release;
ctx->base.make_current = _egl_make_current;
ctx->base.swap_buffers = _egl_swap_buffers;
ctx->base.destroy = _egl_destroy;
if (!_egl_make_current_surfaceless (ctx)) {
/* Fall back to dummy surface, meh. */
eglGetConfigs (dpy, NULL, 0, &numConfigs);
configs = malloc (sizeof(*configs) *numConfigs);
if (configs == NULL) {
free (ctx);
return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
}
eglGetConfigs (dpy, configs, numConfigs, &numConfigs);
ctx->dummy_surface = eglCreatePbufferSurface (dpy, configs[0], attribs);
free (configs);
if (ctx->dummy_surface == NULL) {
free (ctx);
return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
}
if (!eglMakeCurrent (dpy, ctx->dummy_surface, ctx->dummy_surface, egl)) {
free (ctx);
return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
}
}
status = _cairo_gl_dispatch_init (&ctx->base.dispatch, eglGetProcAddress);
if (unlikely (status)) {
free (ctx);
return _cairo_gl_context_create_in_error (status);
}
status = _cairo_gl_context_init (&ctx->base);
if (unlikely (status)) {
if (ctx->dummy_surface != EGL_NO_SURFACE)
eglDestroySurface (dpy, ctx->dummy_surface);
free (ctx);
return _cairo_gl_context_create_in_error (status);
}
eglMakeCurrent (dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
return &ctx->base.base;
}
cairo_surface_t *
cairo_gl_surface_create_for_egl (cairo_device_t *device,
EGLSurface egl,
int width,
int height)
{
cairo_egl_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_egl_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->egl = egl;
return &surface->base.base;
}
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