1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/*
* This file is part of NumptyPhysics <http://thp.io/2015/numptyphysics/>
* Coyright (c) 2014 Thomas Perl <m@thp.io>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include "glaserl_buffer.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
glaserl_buffer_t *
glaserl_buffer_new()
{
glaserl_buffer_t *buffer = (glaserl_buffer_t *)calloc(sizeof(glaserl_buffer_t), 1);
buffer->buffer = 0;
buffer->size = 0;
buffer->offset = 0;
buffer->frozen = 0;
glaserl_buffer_resize(buffer, 1024);
glGenBuffers(1, &(buffer->id));
return buffer;
}
void
glaserl_buffer_resize(glaserl_buffer_t *buffer, size_t size)
{
if (buffer->frozen) {
assert(0);
return;
}
buffer->size = size;
buffer->buffer = (char *)realloc(buffer->buffer, size);
}
void
glaserl_buffer_append(glaserl_buffer_t *buffer, void *data, size_t size)
{
if (buffer->frozen) {
assert(0);
return;
}
if (buffer->offset + size > buffer->size) {
size_t new_size = buffer->size;
while (buffer->offset + size > new_size) {
new_size *= 2;
}
glaserl_buffer_resize(buffer, new_size);
}
memcpy(buffer->buffer + buffer->offset, data, size);
buffer->offset += size;
}
void
glaserl_buffer_freeze(glaserl_buffer_t *buffer)
{
glBindBuffer(GL_ARRAY_BUFFER, buffer->id);
glBufferData(GL_ARRAY_BUFFER, buffer->offset, buffer->buffer, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
buffer->frozen = 1;
}
size_t
glaserl_buffer_enable(glaserl_buffer_t *buffer)
{
glBindBuffer(GL_ARRAY_BUFFER, buffer->id);
size_t size = buffer->offset;
if (!buffer->frozen) {
glBufferData(GL_ARRAY_BUFFER, buffer->offset, buffer->buffer, GL_STREAM_DRAW);
buffer->offset = 0;
}
return size;
}
void
glaserl_buffer_disable(glaserl_buffer_t *buffer)
{
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
void
glaserl_buffer_destroy(glaserl_buffer_t *buffer)
{
glDeleteBuffers(1, &(buffer->id));
free(buffer->buffer);
free(buffer);
}
|
