| 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 | #ifndef __GSK_GL_BUFFER_PRIVATE_H__ |
| 22 | #define __GSK_GL_BUFFER_PRIVATE_H__ |
| 23 | |
| 24 | #include "gskgltypesprivate.h" |
| 25 | |
| 26 | G_BEGIN_DECLS |
| 27 | |
| 28 | typedef struct _GskGLBuffer |
| 29 | { |
| 30 | guint8 *buffer; |
| 31 | gsize buffer_pos; |
| 32 | gsize buffer_len; |
| 33 | guint count; |
| 34 | GLenum target; |
| 35 | gsize element_size; |
| 36 | } GskGLBuffer; |
| 37 | |
| 38 | void gsk_gl_buffer_init (GskGLBuffer *self, |
| 39 | GLenum target, |
| 40 | guint element_size); |
| 41 | void gsk_gl_buffer_destroy (GskGLBuffer *buffer); |
| 42 | GLuint gsk_gl_buffer_submit (GskGLBuffer *buffer); |
| 43 | |
| 44 | static inline gpointer |
| 45 | gsk_gl_buffer_advance (GskGLBuffer *buffer, |
| 46 | guint count) |
| 47 | { |
| 48 | gpointer ret; |
| 49 | gsize to_alloc = count * buffer->element_size; |
| 50 | |
| 51 | if G_UNLIKELY (buffer->buffer_pos + to_alloc > buffer->buffer_len) |
| 52 | { |
| 53 | while (buffer->buffer_pos + to_alloc > buffer->buffer_len) |
| 54 | buffer->buffer_len *= 2; |
| 55 | buffer->buffer = g_realloc (mem: buffer->buffer, n_bytes: buffer->buffer_len); |
| 56 | } |
| 57 | |
| 58 | ret = buffer->buffer + buffer->buffer_pos; |
| 59 | |
| 60 | buffer->buffer_pos += to_alloc; |
| 61 | buffer->count += count; |
| 62 | |
| 63 | return ret; |
| 64 | } |
| 65 | |
| 66 | static inline void |
| 67 | gsk_gl_buffer_retract (GskGLBuffer *buffer, |
| 68 | guint count) |
| 69 | { |
| 70 | buffer->buffer_pos -= count * buffer->element_size; |
| 71 | buffer->count -= count; |
| 72 | } |
| 73 | |
| 74 | static inline guint |
| 75 | gsk_gl_buffer_get_offset (GskGLBuffer *buffer) |
| 76 | { |
| 77 | return buffer->count; |
| 78 | } |
| 79 | |
| 80 | G_END_DECLS |
| 81 | |
| 82 | #endif /* __GSK_GL_BUFFER_PRIVATE_H__ */ |
| 83 |