gl2.cpp revision 4774338bd0ad1ebe42c311fd0c72f13786b5c800 
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 <GLES3/gl3.h>
24#include <GLES3/gl3ext.h>
25#include <GLES2/gl2ext.h>
26
27#include <cutils/log.h>
28#include <cutils/properties.h>
29
30#include "hooks.h"
31#include "egl_impl.h"
32
33using namespace android;
34
35// ----------------------------------------------------------------------------
36// Actual GL entry-points
37// ----------------------------------------------------------------------------
38
39#undef API_ENTRY
40#undef CALL_GL_API
41#undef CALL_GL_API_RETURN
42
43#if USE_FAST_TLS_KEY
44
45    #ifdef HAVE_ARM_TLS_REGISTER
46        #define GET_TLS(reg) \
47            "mrc p15, 0, " #reg ", c13, c0, 3 \n"
48    #else
49        #define GET_TLS(reg) \
50            "mov   " #reg ", #0xFFFF0FFF      \n"  \
51            "ldr   " #reg ", [" #reg ", #-15] \n"
52    #endif
53
54    #define API_ENTRY(_api) __attribute__((naked)) _api
55
56    #define CALL_GL_API(_api, ...)                              \
57         asm volatile(                                          \
58            GET_TLS(r12)                                        \
59            "ldr   r12, [r12, %[tls]] \n"                       \
60            "cmp   r12, #0            \n"                       \
61            "ldrne pc,  [r12, %[api]] \n"                       \
62            "mov   r0, #0             \n"                       \
63            "bx    lr                 \n"                       \
64            :                                                   \
65            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
66              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
67            :                                                   \
68            );
69
70    #define CALL_GL_API_RETURN(_api, ...) \
71        CALL_GL_API(_api, __VA_ARGS__) \
72        return 0; // placate gcc's warnings. never reached.
73
74#else
75
76    #define API_ENTRY(_api) _api
77
78    #define CALL_GL_API(_api, ...)                                       \
79        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
80        _c->_api(__VA_ARGS__);
81
82    #define CALL_GL_API_RETURN(_api, ...)                                \
83        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
84        return _c->_api(__VA_ARGS__)
85
86#endif
87
88
89extern "C" {
90#include "gl3_api.in"
91#include "gl2ext_api.in"
92#include "gl3ext_api.in"
93}
94
95#undef API_ENTRY
96#undef CALL_GL_API
97#undef CALL_GL_API_RETURN
98
99/*
100 * glGetString() is special because we expose some extensions in the wrapper
101 */
102
103extern "C" const GLubyte * __glGetString(GLenum name);
104
105const GLubyte * glGetString(GLenum name)
106{
107    const GLubyte * ret = egl_get_string_for_current_context(name);
108    if (ret == NULL) {
109        ret = __glGetString(name);
110    }
111    return ret;
112}
113