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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-util.h"
#include "cogl-object-private.h"
#include "cogl-context-private.h"
#include "cogl-indices.h"
#include "cogl-indices-private.h"
#include "cogl-index-buffer.h"
#include <stdarg.h>
static void _cogl_indices_free (CoglIndices *indices);
COGL_OBJECT_DEFINE (Indices, indices);
static size_t
sizeof_indices_type (CoglIndicesType type)
{
switch (type)
{
case COGL_INDICES_TYPE_UNSIGNED_BYTE:
return 1;
case COGL_INDICES_TYPE_UNSIGNED_SHORT:
return 2;
case COGL_INDICES_TYPE_UNSIGNED_INT:
return 4;
}
g_return_val_if_reached (0);
}
CoglIndices *
cogl_indices_new_for_buffer (CoglIndicesType type,
CoglIndexBuffer *buffer,
gsize offset)
{
CoglIndices *indices = g_slice_new (CoglIndices);
indices->buffer = cogl_object_ref (buffer);
indices->offset = offset;
indices->type = type;
indices->immutable_ref = 0;
return _cogl_indices_object_new (indices);
}
CoglIndices *
cogl_indices_new (CoglIndicesType type,
const void *indices_data,
int n_indices)
{
size_t buffer_bytes = sizeof_indices_type (type) * n_indices;
CoglIndexBuffer *index_buffer = cogl_index_buffer_new (buffer_bytes);
CoglBuffer *buffer = COGL_BUFFER (index_buffer);
CoglIndices *indices;
cogl_buffer_set_data (buffer,
0,
indices_data,
buffer_bytes);
indices = cogl_indices_new_for_buffer (type, index_buffer, 0);
cogl_object_unref (index_buffer);
return indices;
}
CoglIndexBuffer *
cogl_indices_get_buffer (CoglIndices *indices)
{
return indices->buffer;
}
CoglIndicesType
cogl_indices_get_type (CoglIndices *indices)
{
_COGL_RETURN_VAL_IF_FAIL (cogl_is_indices (indices),
COGL_INDICES_TYPE_UNSIGNED_BYTE);
return indices->type;
}
gsize
cogl_indices_get_offset (CoglIndices *indices)
{
_COGL_RETURN_VAL_IF_FAIL (cogl_is_indices (indices), 0);
return indices->offset;
}
static void
warn_about_midscene_changes (void)
{
static gboolean seen = FALSE;
if (!seen)
{
g_warning ("Mid-scene modification of indices has "
"undefined results\n");
seen = TRUE;
}
}
void
cogl_indices_set_offset (CoglIndices *indices,
gsize offset)
{
_COGL_RETURN_IF_FAIL (cogl_is_indices (indices));
if (G_UNLIKELY (indices->immutable_ref))
warn_about_midscene_changes ();
indices->offset = offset;
}
static void
_cogl_indices_free (CoglIndices *indices)
{
cogl_object_unref (indices->buffer);
g_slice_free (CoglIndices, indices);
}
CoglIndices *
_cogl_indices_immutable_ref (CoglIndices *indices)
{
_COGL_RETURN_VAL_IF_FAIL (cogl_is_indices (indices), NULL);
indices->immutable_ref++;
_cogl_buffer_immutable_ref (COGL_BUFFER (indices->buffer));
return indices;
}
void
_cogl_indices_immutable_unref (CoglIndices *indices)
{
_COGL_RETURN_IF_FAIL (cogl_is_indices (indices));
_COGL_RETURN_IF_FAIL (indices->immutable_ref > 0);
indices->immutable_ref--;
_cogl_buffer_immutable_unref (COGL_BUFFER (indices->buffer));
}
CoglIndices *
cogl_get_rectangle_indices (int n_rectangles)
{
int n_indices = n_rectangles * 6;
_COGL_GET_CONTEXT (ctx, NULL);
/* Check if the largest index required will fit in a byte array... */
if (n_indices <= 256 / 4 * 6)
{
/* Generate the byte array if we haven't already */
if (ctx->rectangle_byte_indices == NULL)
{
guint8 *byte_array = g_malloc (256 / 4 * 6 * sizeof (guint8));
guint8 *p = byte_array;
int i, vert_num = 0;
for (i = 0; i < 256 / 4; i++)
{
*(p++) = vert_num + 0;
*(p++) = vert_num + 1;
*(p++) = vert_num + 2;
*(p++) = vert_num + 0;
*(p++) = vert_num + 2;
*(p++) = vert_num + 3;
vert_num += 4;
}
ctx->rectangle_byte_indices
= cogl_indices_new (COGL_INDICES_TYPE_UNSIGNED_BYTE,
byte_array,
256 / 4 * 6);
g_free (byte_array);
}
return ctx->rectangle_byte_indices;
}
else
{
if (ctx->rectangle_short_indices_len < n_indices)
{
guint16 *short_array;
guint16 *p;
int i, vert_num = 0;
if (ctx->rectangle_short_indices != NULL)
cogl_object_unref (ctx->rectangle_short_indices);
/* Pick a power of two >= MAX (512, n_indices) */
if (ctx->rectangle_short_indices_len == 0)
ctx->rectangle_short_indices_len = 512;
while (ctx->rectangle_short_indices_len < n_indices)
ctx->rectangle_short_indices_len *= 2;
/* Over-allocate to generate a whole number of quads */
p = short_array = g_malloc ((ctx->rectangle_short_indices_len
+ 5) / 6 * 6
* sizeof (guint16));
/* Fill in the complete quads */
for (i = 0; i < ctx->rectangle_short_indices_len; i += 6)
{
*(p++) = vert_num + 0;
*(p++) = vert_num + 1;
*(p++) = vert_num + 2;
*(p++) = vert_num + 0;
*(p++) = vert_num + 2;
*(p++) = vert_num + 3;
vert_num += 4;
}
ctx->rectangle_short_indices
= cogl_indices_new (COGL_INDICES_TYPE_UNSIGNED_SHORT,
short_array,
ctx->rectangle_short_indices_len);
g_free (short_array);
}
return ctx->rectangle_short_indices;
}
}
|