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
|
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "eglconfig.h"
#include "eglcontext.h"
#include "egldriver.h"
#include "eglglobals.h"
#include "eglhash.h"
#include "eglsurface.h"
/**
* Initialize the given _EGLContext object to defaults.
*/
void
_eglInitContext(_EGLContext *ctx)
{
/* just init to zero for now */
memset(ctx, 0, sizeof(_EGLContext));
}
/*
* Assign an EGLContext handle to the _EGLContext object then put it into
* the hash table.
*/
void
_eglSaveContext(_EGLContext *ctx)
{
assert(ctx);
ctx->Handle = _eglHashGenKey(_eglGlobal.Contexts);
_eglHashInsert(_eglGlobal.Contexts, ctx->Handle, ctx);
}
/**
* Remove the given _EGLContext object from the hash table.
*/
void
_eglRemoveContext(_EGLContext *ctx)
{
_eglHashRemove(_eglGlobal.Contexts, ctx->Handle);
}
/**
* Return the _EGLContext object that corresponds to the given
* EGLContext handle.
*/
_EGLContext *
_eglLookupContext(EGLContext ctx)
{
_EGLContext *c = (_EGLContext *) _eglHashLookup(_eglGlobal.Contexts, ctx);
return c;
}
/**
* Return the currently bound _EGLContext object, or NULL.
*/
_EGLContext *
_eglGetCurrentContext(void)
{
/* XXX this should be per-thread someday */
return _eglGlobal.CurrentContext;
}
/**
* Just a placeholder/demo function. Real driver will never use this!
*/
EGLContext
_eglCreateContext(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, EGLContext share_list, const EGLint *attrib_list)
{
_EGLConfig *conf = _eglLookupConfig(drv, dpy, config);
if (!conf) {
_eglError(EGL_BAD_CONFIG, "eglCreateContext");
return EGL_NO_CONTEXT;
}
if (share_list != EGL_NO_CONTEXT) {
_EGLContext *shareCtx = _eglLookupContext(share_list);
if (!shareCtx) {
_eglError(EGL_BAD_CONTEXT, "eglCreateContext(share_list)");
return EGL_NO_CONTEXT;
}
}
return EGL_NO_CONTEXT;
}
/**
* Default fallback routine - drivers should usually override this.
*/
EGLBoolean
_eglDestroyContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext ctx)
{
_EGLContext *context = _eglLookupContext(ctx);
if (context) {
_eglHashRemove(_eglGlobal.Contexts, ctx);
if (context->IsBound) {
context->DeletePending = EGL_TRUE;
}
else {
free(context);
}
return EGL_TRUE;
}
else {
_eglError(EGL_BAD_CONTEXT, "eglDestroyContext");
return EGL_TRUE;
}
}
EGLBoolean
_eglQueryContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext ctx, EGLint attribute, EGLint *value)
{
_EGLContext *c = _eglLookupContext(ctx);
(void) drv;
(void) dpy;
if (!c) {
_eglError(EGL_BAD_CONTEXT, "eglQueryContext");
return EGL_FALSE;
}
switch (attribute) {
case EGL_CONFIG_ID:
*value = GET_CONFIG_ATTRIB(c->Config, EGL_CONFIG_ID);
return EGL_TRUE;
default:
_eglError(EGL_BAD_ATTRIBUTE, "eglQueryContext");
return EGL_FALSE;
}
}
/**
* Drivers will typically call this to do the error checking and
* update the various IsBound and DeletePending flags.
* Then, the driver will do its device-dependent Make-Current stuff.
*/
EGLBoolean
_eglMakeCurrent(_EGLDriver *drv, EGLDisplay dpy, EGLSurface d, EGLSurface r, EGLContext context)
{
_EGLContext *ctx = _eglLookupContext(context);
_EGLSurface *draw = _eglLookupSurface(d);
_EGLSurface *read = _eglLookupSurface(r);
_EGLContext *oldContext = _eglGetCurrentContext();
_EGLSurface *oldDrawSurface = _eglGetCurrentSurface(EGL_DRAW);
_EGLSurface *oldReadSurface = _eglGetCurrentSurface(EGL_READ);
/* error checking */
if (ctx) {
if (draw == NULL || read == NULL) {
_eglError(EGL_BAD_MATCH, "eglMakeCurrent");
return EGL_FALSE;
}
if (draw->Config != ctx->Config) {
_eglError(EGL_BAD_MATCH, "eglMakeCurrent");
return EGL_FALSE;
}
if (read->Config != ctx->Config) {
_eglError(EGL_BAD_MATCH, "eglMakeCurrent");
return EGL_FALSE;
}
}
/*
* check if the old context or surfaces need to be deleted
*/
if (oldDrawSurface != NULL) {
oldDrawSurface->IsBound = EGL_FALSE;
if (oldDrawSurface->DeletePending) {
/* make sure we don't try to rebind a deleted surface */
if (draw == oldDrawSurface || draw == oldReadSurface) {
draw = NULL;
}
/* really delete surface now */
drv->DestroySurface(drv, dpy, oldDrawSurface->Handle);
}
}
if (oldReadSurface != NULL && oldReadSurface != oldDrawSurface) {
oldReadSurface->IsBound = EGL_FALSE;
if (oldReadSurface->DeletePending) {
/* make sure we don't try to rebind a deleted surface */
if (read == oldDrawSurface || read == oldReadSurface) {
read = NULL;
}
/* really delete surface now */
drv->DestroySurface(drv, dpy, oldReadSurface->Handle);
}
}
if (oldContext != NULL) {
oldContext->IsBound = EGL_FALSE;
if (oldContext->DeletePending) {
/* make sure we don't try to rebind a deleted context */
if (ctx == oldContext) {
ctx = NULL;
}
/* really delete context now */
drv->DestroyContext(drv, dpy, oldContext->Handle);
}
}
if (ctx) {
/* check read/draw again, in case we deleted them above */
if (draw == NULL || read == NULL) {
_eglError(EGL_BAD_MATCH, "eglMakeCurrent");
return EGL_FALSE;
}
ctx->DrawSurface = draw;
ctx->ReadSurface = read;
ctx->IsBound = EGL_TRUE;
draw->IsBound = EGL_TRUE;
read->IsBound = EGL_TRUE;
}
_eglGlobal.CurrentContext = ctx;
return EGL_TRUE;
}
|
