gl2.cpp revision 7c0441ac271f4e00a2d63eb3048c037ebffa90b9 
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#define DEBUG_CALL_GL_API 0
43
44#if USE_FAST_TLS_KEY
45
46    #ifdef HAVE_ARM_TLS_REGISTER
47        #define GET_TLS(reg) \
48            "mrc p15, 0, " #reg ", c13, c0, 3 \n"
49    #else
50        #define GET_TLS(reg) \
51            "mov   " #reg ", #0xFFFF0FFF      \n"  \
52            "ldr   " #reg ", [" #reg ", #-15] \n"
53    #endif
54
55    #define API_ENTRY(_api) __attribute__((naked)) _api
56
57    #define CALL_GL_API(_api, ...)                              \
58         asm volatile(                                          \
59            GET_TLS(r12)                                        \
60            "ldr   r12, [r12, %[tls]] \n"                       \
61            "cmp   r12, #0            \n"                       \
62            "ldrne pc,  [r12, %[api]] \n"                       \
63            "mov   r0, #0             \n"                       \
64            "bx    lr                 \n"                       \
65            :                                                   \
66            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
67              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
68            :                                                   \
69            );
70
71    #define CALL_GL_API_RETURN(_api, ...) \
72        CALL_GL_API(_api, __VA_ARGS__) \
73        return 0; // placate gcc's warnings. never reached.
74
75#else
76
77    #define API_ENTRY(_api) _api
78
79#if DEBUG_CALL_GL_API
80
81    #define CALL_GL_API(_api, ...)                                       \
82        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
83        _c->_api(__VA_ARGS__); \
84        GLenum status = GL_NO_ERROR; \
85        while ((status = glGetError()) != GL_NO_ERROR) { \
86            ALOGD("[" #_api "] 0x%x", status); \
87        }
88
89#else
90
91    #define CALL_GL_API(_api, ...)                                       \
92        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
93        _c->_api(__VA_ARGS__);
94
95#endif
96
97    #define CALL_GL_API_RETURN(_api, ...)                                \
98        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
99        return _c->_api(__VA_ARGS__)
100
101#endif
102
103
104extern "C" {
105#include "gl2_api.in"
106#include "gl2ext_api.in"
107}
108
109#undef API_ENTRY
110#undef CALL_GL_API
111#undef CALL_GL_API_RETURN
112
113/*
114 * glGetString() is special because we expose some extensions in the wrapper
115 */
116
117extern "C" const GLubyte * __glGetString(GLenum name);
118
119const GLubyte * glGetString(GLenum name)
120{
121    const GLubyte * ret = egl_get_string_for_current_context(name);
122    if (ret == NULL) {
123        ret = __glGetString(name);
124    }
125    return ret;
126}
127