gl2.cpp revision 288870ebc3da8121b7a237a53280bd8b931b7a2f 
1/*
2 ** Copyright 2007, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 **     http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17#include <ctype.h>
18#include <string.h>
19#include <errno.h>
20
21#include <sys/ioctl.h>
22
23#include <GLES2/gl2.h>
24#include <GLES2/gl2ext.h>
25
26#include <cutils/log.h>
27#include <cutils/properties.h>
28
29#include "hooks.h"
30#include "egl_impl.h"
31
32using namespace android;
33
34// ----------------------------------------------------------------------------
35// Actual GL entry-points
36// ----------------------------------------------------------------------------
37
38#undef API_ENTRY
39#undef CALL_GL_API
40#undef CALL_GL_API_RETURN
41
42#if USE_FAST_TLS_KEY
43
44    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
45
46    #define API_ENTRY(_api) __attribute__((naked)) _api
47
48    #define CALL_GL_API(_api, ...)                              \
49         asm volatile(                                          \
50            GET_TLS(r12)                                        \
51            "ldr   r12, [r12, %[tls]] \n"                       \
52            "cmp   r12, #0            \n"                       \
53            "ldrne pc,  [r12, %[api]] \n"                       \
54            "mov   r0, #0             \n"                       \
55            "bx    lr                 \n"                       \
56            :                                                   \
57            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
58              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
59            :                                                   \
60            );
61
62    #define CALL_GL_API_RETURN(_api, ...) \
63        CALL_GL_API(_api, __VA_ARGS__) \
64        return 0; // placate gcc's warnings. never reached.
65
66#else
67
68    #define API_ENTRY(_api) _api
69
70    #define CALL_GL_API(_api, ...)                                       \
71        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
72        _c->_api(__VA_ARGS__);
73
74    #define CALL_GL_API_RETURN(_api, ...)                                \
75        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
76        return _c->_api(__VA_ARGS__)
77
78#endif
79
80
81extern "C" {
82#include "gl2_api.in"
83#include "gl2ext_api.in"
84}
85
86#undef API_ENTRY
87#undef CALL_GL_API
88#undef CALL_GL_API_RETURN
89
90/*
91 * glGetString() is special because we expose some extensions in the wrapper
92 */
93
94extern "C" const GLubyte * __glGetString(GLenum name);
95
96const GLubyte * glGetString(GLenum name)
97{
98    const GLubyte * ret = egl_get_string_for_current_context(name);
99    if (ret == NULL) {
100        ret = __glGetString(name);
101    }
102    return ret;
103}
104