1/* gskglbufferprivate.h
2 *
3 * Copyright 2020 Christian Hergert <chergert@redhat.com>
4 *
5 * This file is free software; you can redistribute it and/or modify it under
6 * the terms of the GNU Lesser General Public License as published by the Free
7 * Software Foundation; either version 2.1 of the License, or (at your option)
8 * any later version.
9 *
10 * This file is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
13 * License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program. If not, see <http://www.gnu.org/licenses/>.
17 *
18 * SPDX-License-Identifier: LGPL-2.1-or-later
19 */
20
21#include "config.h"
22
23#include <string.h>
24
25#include "gskglbufferprivate.h"
26
27/**
28 * gsk_gl_buffer_init:
29 * @target: the target buffer such as %GL_ARRAY_BUFFER or %GL_UNIFORM_BUFFER
30 * @element_size: the size of elements within the buffer
31 *
32 * Creates a new `GskGLBuffer` which can be used to deliver data to shaders
33 * within a GLSL program. You can use this to store vertices such as with
34 * %GL_ARRAY_BUFFER or uniform data with %GL_UNIFORM_BUFFER.
35 */
36void
37gsk_gl_buffer_init (GskGLBuffer *self,
38 GLenum target,
39 guint element_size)
40{
41 memset (s: self, c: 0, n: sizeof *self);
42
43 /* Default to 2 pages, power-of-two growth from there */
44 self->buffer_len = 4096 * 2;
45 self->buffer = g_malloc (n_bytes: self->buffer_len);
46 self->target = target;
47 self->element_size = element_size;
48}
49
50GLuint
51gsk_gl_buffer_submit (GskGLBuffer *buffer)
52{
53 GLuint id;
54
55 glGenBuffers (1, &id);
56 glBindBuffer (buffer->target, id);
57 glBufferData (buffer->target, buffer->buffer_pos, buffer->buffer, GL_STATIC_DRAW);
58
59 buffer->buffer_pos = 0;
60 buffer->count = 0;
61
62 return id;
63}
64
65void
66gsk_gl_buffer_destroy (GskGLBuffer *buffer)
67{
68 g_clear_pointer (&buffer->buffer, g_free);
69}
70

source code of gtk/gsk/gl/gskglbuffer.c