File: dispatch_wgl.c

package info (click to toggle)
libepoxy 1.2-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 3,028 kB
  • ctags: 312
  • sloc: xml: 46,840; ansic: 2,439; python: 550; makefile: 283; sh: 9
file content (197 lines) | stat: -rw-r--r-- 5,853 bytes parent folder | download
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
/*
 * Copyright © 2013 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <assert.h>
#include <string.h>
#include <stdio.h>

#include "dispatch_common.h"

static bool first_context_current = false;
static bool already_switched_to_dispatch_table = false;

/**
 * If we can determine the WGL extension support from the current
 * context, then return that, otherwise give the answer that will just
 * send us on to get_proc_address().
 */
bool
epoxy_conservative_has_wgl_extension(const char *ext)
{
    HDC hdc = wglGetCurrentDC();

    if (!hdc)
        return true;

    return epoxy_has_wgl_extension(hdc, ext);
}

PUBLIC bool
epoxy_has_wgl_extension(HDC hdc, const char *ext)
 {
     PFNWGLGETEXTENSIONSSTRINGARBPROC getext;

     getext = (void *)wglGetProcAddress("wglGetExtensionsStringARB");
     if (!getext) {
         fprintf(stderr,
                 "Implementation unexpectedly missing "
                 "WGL_ARB_extensions_string.  Probably a libepoxy bug.\n");
         return false;
     }

    return epoxy_extension_in_string(getext(hdc), ext);
}

/**
 * Does the work necessary to update the win32 per-thread dispatch
 * tables when wglMakeCurrent() is called.
 *
 * Right now, we use global function pointers until the second
 * MakeCurrent occurs, at which point we switch to dispatch tables.
 * This could be improved in the future to track a resolved dispatch
 * table per context and reuse it when the context is made current
 * again.
 */
PUBLIC void
epoxy_handle_external_wglMakeCurrent(void)
{
    if (!first_context_current) {
        first_context_current = true;
    } else {
        if (!already_switched_to_dispatch_table) {
            already_switched_to_dispatch_table = true;
            gl_switch_to_dispatch_table();
            wgl_switch_to_dispatch_table();
        }

        gl_init_dispatch_table();
        wgl_init_dispatch_table();
    }
}

/**
 * This global symbol is apparently looked up by Windows when loading
 * a DLL, but it doesn't declare the prototype.
 */
BOOL WINAPI
DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved);

BOOL WINAPI
DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)
{
    void *data;

    switch (reason) {
    case DLL_PROCESS_ATTACH:
        gl_tls_index = TlsAlloc();
        if (gl_tls_index == TLS_OUT_OF_INDEXES)
            return FALSE;
        wgl_tls_index = TlsAlloc();
        if (wgl_tls_index == TLS_OUT_OF_INDEXES)
            return FALSE;

        first_context_current = false;

        /* FALLTHROUGH */

    case DLL_THREAD_ATTACH:
        data = LocalAlloc(LPTR, gl_tls_size);
        TlsSetValue(gl_tls_index, data);

        data = LocalAlloc(LPTR, wgl_tls_size);
        TlsSetValue(wgl_tls_index, data);

        break;

    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        data = TlsGetValue(gl_tls_index);
        LocalFree(data);

        data = TlsGetValue(wgl_tls_index);
        LocalFree(data);
        break;

        if (reason == DLL_PROCESS_DETACH) {
            TlsFree(gl_tls_index);
            TlsFree(wgl_tls_index);
        }
        break;
    }

    return TRUE;
}

WRAPPER_VISIBILITY BOOL
WRAPPER(epoxy_wglMakeCurrent)(HDC hdc, HGLRC hglrc)
{
    BOOL ret = epoxy_wglMakeCurrent_unwrapped(hdc, hglrc);

    epoxy_handle_external_wglMakeCurrent();

    return ret;
}


WRAPPER_VISIBILITY BOOL
WRAPPER(epoxy_wglMakeContextCurrentARB)(HDC hDrawDC,
                                        HDC hReadDC,
                                        HGLRC hglrc)
{
    BOOL ret = epoxy_wglMakeContextCurrentARB_unwrapped(hDrawDC, hReadDC,
                                                        hglrc);

    epoxy_handle_external_wglMakeCurrent();

    return ret;
}


WRAPPER_VISIBILITY BOOL
WRAPPER(epoxy_wglMakeContextCurrentEXT)(HDC hDrawDC,
                                        HDC hReadDC,
                                        HGLRC hglrc)
{
    BOOL ret = epoxy_wglMakeContextCurrentEXT_unwrapped(hDrawDC, hReadDC,
                                                        hglrc);

    epoxy_handle_external_wglMakeCurrent();

    return ret;
}


WRAPPER_VISIBILITY BOOL
WRAPPER(epoxy_wglMakeAssociatedContextCurrentAMD)(HGLRC hglrc)
{
    BOOL ret = epoxy_wglMakeAssociatedContextCurrentAMD_unwrapped(hglrc);

    epoxy_handle_external_wglMakeCurrent();

    return ret;
}

PUBLIC PFNWGLMAKECURRENTPROC epoxy_wglMakeCurrent = epoxy_wglMakeCurrent_wrapped;
PUBLIC PFNWGLMAKECONTEXTCURRENTEXTPROC epoxy_wglMakeContextCurrentEXT = epoxy_wglMakeContextCurrentEXT_wrapped;
PUBLIC PFNWGLMAKECONTEXTCURRENTARBPROC epoxy_wglMakeContextCurrentARB = epoxy_wglMakeContextCurrentARB_wrapped;
PUBLIC PFNWGLMAKEASSOCIATEDCONTEXTCURRENTAMDPROC epoxy_wglMakeAssociatedContextCurrentEXT = epoxy_wglMakeAssociatedContextCurrentAMD_wrapped;