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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>
*/
#include "cairoint.h"
#include "cairo-error-private.h"
#include "cairo-gl-private.h"
static void
_gl_lock (void *device)
{
cairo_gl_context_t *ctx = (cairo_gl_context_t *) device;
ctx->acquire (ctx);
}
static void
_gl_unlock (void *device)
{
cairo_gl_context_t *ctx = (cairo_gl_context_t *) device;
ctx->release (ctx);
ctx->current_target = NULL;
}
static void
_gl_destroy (void *device)
{
cairo_gl_context_t *ctx = device;
cairo_scaled_font_t *scaled_font, *next_scaled_font;
int n;
ctx->acquire (ctx);
cairo_list_foreach_entry_safe (scaled_font,
next_scaled_font,
cairo_scaled_font_t,
&ctx->fonts,
link)
{
_cairo_scaled_font_revoke_ownership (scaled_font);
}
for (n = 0; n < ARRAY_LENGTH (ctx->glyph_cache); n++)
_cairo_gl_glyph_cache_fini (ctx, &ctx->glyph_cache[n]);
ctx->destroy (ctx);
free (ctx);
}
static const cairo_device_backend_t _cairo_gl_device_backend = {
CAIRO_DEVICE_TYPE_GL,
_gl_lock,
_gl_unlock,
NULL, /* flush */
NULL, /* finish */
_gl_destroy,
};
cairo_status_t
_cairo_gl_context_init (cairo_gl_context_t *ctx)
{
int n;
_cairo_device_init (&ctx->base, &_cairo_gl_device_backend);
memset (ctx->glyph_cache, 0, sizeof (ctx->glyph_cache));
cairo_list_init (&ctx->fonts);
if (glewInit () != GLEW_OK)
return _cairo_error (CAIRO_STATUS_INVALID_FORMAT); /* XXX */
if (! GLEW_EXT_framebuffer_object ||
! GLEW_ARB_texture_env_combine ||
! GLEW_EXT_bgra)
{
fprintf (stderr,
"Required GL extensions not available:\n");
if (! GLEW_EXT_framebuffer_object)
fprintf (stderr, " GL_EXT_framebuffer_object\n");
if (! GLEW_ARB_texture_env_combine)
fprintf (stderr, " GL_ARB_texture_env_combine\n");
/* EXT_bgra is used in two places:
* - draw_image to upload common pixman formats without hand-swizzling.
* - get_image to download common pixman formats without hand-swizzling.
*/
if (! GLEW_EXT_bgra)
fprintf (stderr, " GL_EXT_bgra\n");
return _cairo_error (CAIRO_STATUS_INVALID_FORMAT); /* XXX */
}
if (! GLEW_ARB_texture_non_power_of_two &&
! GLEW_ARB_texture_rectangle ) {
fprintf (stderr,
"Required GL extensions not available:\n");
fprintf (stderr, " GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle\n");
}
if (!GLEW_ARB_texture_non_power_of_two)
ctx->tex_target = GL_TEXTURE_RECTANGLE_EXT;
else
ctx->tex_target = GL_TEXTURE_2D;
ctx->has_span_renderer = GLEW_ARB_vertex_buffer_object;
if (GLEW_VERSION_2_0 ||
(GLEW_ARB_fragment_shader &&
GLEW_ARB_vertex_shader &&
GLEW_ARB_shader_objects))
{
ctx->using_glsl = TRUE;
}
init_shader_program (&ctx->fill_rectangles_shader);
/* Set up the dummy texture for tex_env_combine with constant color. */
glGenTextures (1, &ctx->dummy_tex);
glBindTexture (ctx->tex_target, ctx->dummy_tex);
glTexImage2D (ctx->tex_target, 0, GL_RGBA, 1, 1, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
/* PBO for any sort of texture upload */
glGenBuffersARB (1, &ctx->texture_load_pbo);
glGenBuffersARB (1, &ctx->vbo);
ctx->max_framebuffer_size = 0;
glGetIntegerv (GL_MAX_RENDERBUFFER_SIZE, &ctx->max_framebuffer_size);
ctx->max_texture_size = 0;
glGetIntegerv (GL_MAX_TEXTURE_SIZE, &ctx->max_texture_size);
for (n = 0; n < ARRAY_LENGTH (ctx->glyph_cache); n++)
_cairo_gl_glyph_cache_init (&ctx->glyph_cache[n]);
return CAIRO_STATUS_SUCCESS;
}
void
_cairo_gl_set_destination (cairo_gl_context_t *ctx,
cairo_gl_surface_t *surface)
{
if (ctx->current_target != surface) {
ctx->current_target = surface;
if (surface->fb) {
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, surface->fb);
glDrawBuffer (GL_COLOR_ATTACHMENT0_EXT);
glReadBuffer (GL_COLOR_ATTACHMENT0_EXT);
} else {
ctx->make_current (ctx, surface);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
glDrawBuffer (GL_BACK_LEFT);
glReadBuffer (GL_BACK_LEFT);
}
}
glViewport (0, 0, surface->width, surface->height);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
if (surface->fb)
glOrtho (0, surface->width, 0, surface->height, -1.0, 1.0);
else
glOrtho (0, surface->width, surface->height, 0, -1.0, 1.0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
}
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