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
|
/*
* 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 2
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2014 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup gpu
*
* Interface for accessing gpu-related methods for selection. The semantics will be
* similar to glRenderMode(GL_SELECT) since the goal is to maintain compatibility.
*/
#include <stdlib.h>
#include "GPU_glew.h"
#include "GPU_select.h"
#include "GPU_state.h"
#include "MEM_guardedalloc.h"
#include "BLI_rect.h"
#include "BLI_utildefines.h"
#include "gpu_select_private.h"
/* Ad hoc number of queries to allocate to skip doing many glGenQueries */
#define ALLOC_QUERIES 200
typedef struct GPUQueryState {
/* Tracks whether a query has been issued so that gpu_load_id can end the previous one */
bool query_issued;
/* array holding the OpenGL query identifiers */
uint *queries;
/* array holding the id corresponding to each query */
uint *id;
/* number of queries in *queries and *id */
uint num_of_queries;
/* index to the next query to start */
uint active_query;
/* cache on initialization */
uint (*buffer)[4];
/* buffer size (stores number of integers, for actual size multiply by sizeof integer)*/
uint bufsize;
/* mode of operation */
char mode;
uint index;
int oldhits;
} GPUQueryState;
static GPUQueryState g_query_state = {0};
void gpu_select_query_begin(
uint (*buffer)[4], uint bufsize, const rcti *input, char mode, int oldhits)
{
float viewport[4];
g_query_state.query_issued = false;
g_query_state.active_query = 0;
g_query_state.num_of_queries = 0;
g_query_state.bufsize = bufsize;
g_query_state.buffer = buffer;
g_query_state.mode = mode;
g_query_state.index = 0;
g_query_state.oldhits = oldhits;
g_query_state.num_of_queries = ALLOC_QUERIES;
g_query_state.queries = MEM_mallocN(
g_query_state.num_of_queries * sizeof(*g_query_state.queries), "gpu selection queries");
g_query_state.id = MEM_mallocN(g_query_state.num_of_queries * sizeof(*g_query_state.id),
"gpu selection ids");
glGenQueries(g_query_state.num_of_queries, g_query_state.queries);
gpuPushAttr(GPU_DEPTH_BUFFER_BIT | GPU_VIEWPORT_BIT | GPU_SCISSOR_BIT);
/* disable writing to the framebuffer */
GPU_color_mask(false, false, false, false);
/* In order to save some fill rate we minimize the viewport using rect.
* We need to get the region of the viewport so that our geometry doesn't
* get rejected before the depth test. Should probably cull rect against
* the viewport but this is a rare case I think */
GPU_viewport_size_get_f(viewport);
GPU_viewport(viewport[0], viewport[1], BLI_rcti_size_x(input), BLI_rcti_size_y(input));
/* occlusion queries operates on fragments that pass tests and since we are interested on all
* objects in the view frustum independently of their order, we need to disable the depth test */
if (mode == GPU_SELECT_ALL) {
/* glQueries on Windows+Intel drivers only works with depth testing turned on.
* See T62947 for details */
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_ALWAYS);
glDepthMask(GL_TRUE);
}
else if (mode == GPU_SELECT_NEAREST_FIRST_PASS) {
glClear(GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
glDepthFunc(GL_LEQUAL);
}
else if (mode == GPU_SELECT_NEAREST_SECOND_PASS) {
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);
glDepthFunc(GL_EQUAL);
}
}
bool gpu_select_query_load_id(uint id)
{
if (g_query_state.query_issued) {
glEndQuery(GL_SAMPLES_PASSED);
}
/* if required, allocate extra queries */
if (g_query_state.active_query == g_query_state.num_of_queries) {
g_query_state.num_of_queries += ALLOC_QUERIES;
g_query_state.queries = MEM_reallocN(
g_query_state.queries, g_query_state.num_of_queries * sizeof(*g_query_state.queries));
g_query_state.id = MEM_reallocN(g_query_state.id,
g_query_state.num_of_queries * sizeof(*g_query_state.id));
glGenQueries(ALLOC_QUERIES, &g_query_state.queries[g_query_state.active_query]);
}
glBeginQuery(GL_SAMPLES_PASSED, g_query_state.queries[g_query_state.active_query]);
g_query_state.id[g_query_state.active_query] = id;
g_query_state.active_query++;
g_query_state.query_issued = true;
if (g_query_state.mode == GPU_SELECT_NEAREST_SECOND_PASS) {
/* Second pass should never run if first pass fails, can read past 'bufsize' in this case. */
BLI_assert(g_query_state.oldhits != -1);
if (g_query_state.index < g_query_state.oldhits) {
if (g_query_state.buffer[g_query_state.index][3] == id) {
g_query_state.index++;
return true;
}
else {
return false;
}
}
}
return true;
}
uint gpu_select_query_end(void)
{
int i;
uint hits = 0;
const uint maxhits = g_query_state.bufsize;
if (g_query_state.query_issued) {
glEndQuery(GL_SAMPLES_PASSED);
}
for (i = 0; i < g_query_state.active_query; i++) {
uint result = 0;
/* We are not using GL_QUERY_RESULT_AVAILABLE and sleep to wait for results,
* because it causes lagging on Windows/NVIDIA, see T61474. */
glGetQueryObjectuiv(g_query_state.queries[i], GL_QUERY_RESULT, &result);
if (result > 0) {
if (g_query_state.mode != GPU_SELECT_NEAREST_SECOND_PASS) {
if (hits < maxhits) {
g_query_state.buffer[hits][0] = 1;
g_query_state.buffer[hits][1] = 0xFFFF;
g_query_state.buffer[hits][2] = 0xFFFF;
g_query_state.buffer[hits][3] = g_query_state.id[i];
hits++;
}
else {
hits = -1;
break;
}
}
else {
int j;
/* search in buffer and make selected object first */
for (j = 0; j < g_query_state.oldhits; j++) {
if (g_query_state.buffer[j][3] == g_query_state.id[i]) {
g_query_state.buffer[j][1] = 0;
g_query_state.buffer[j][2] = 0;
}
}
break;
}
}
}
glDeleteQueries(g_query_state.num_of_queries, g_query_state.queries);
MEM_freeN(g_query_state.queries);
MEM_freeN(g_query_state.id);
gpuPopAttr();
GPU_color_mask(true, true, true, true);
return hits;
}
|
