gl2.cpp revision 7e5099a9ece6a3ed7edb1b5bf60a43422428326c 
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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
30#include <utils/Trace.h>
31
32#include "hooks.h"
33#include "egl_impl.h"
34
35using namespace android;
36
37// ----------------------------------------------------------------------------
38// Actual GL entry-points
39// ----------------------------------------------------------------------------
40
41#undef API_ENTRY
42#undef CALL_GL_API
43#undef CALL_GL_API_RETURN
44
45#define DEBUG_CALL_GL_API 0
46#define SYSTRACE_CALL_GL_API 0
47
48#if USE_FAST_TLS_KEY
49
50    #ifdef HAVE_ARM_TLS_REGISTER
51        #define GET_TLS(reg) \
52            "mrc p15, 0, " #reg ", c13, c0, 3 \n"
53    #else
54        #define GET_TLS(reg) \
55            "mov   " #reg ", #0xFFFF0FFF      \n"  \
56            "ldr   " #reg ", [" #reg ", #-15] \n"
57    #endif
58
59    #define API_ENTRY(_api) __attribute__((naked)) _api
60
61    #define CALL_GL_API(_api, ...)                              \
62         asm volatile(                                          \
63            GET_TLS(r12)                                        \
64            "ldr   r12, [r12, %[tls]] \n"                       \
65            "cmp   r12, #0            \n"                       \
66            "ldrne pc,  [r12, %[api]] \n"                       \
67            "mov   r0, #0             \n"                       \
68            "bx    lr                 \n"                       \
69            :                                                   \
70            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
71              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
72            :                                                   \
73            );
74
75    #define CALL_GL_API_RETURN(_api, ...) \
76        CALL_GL_API(_api, __VA_ARGS__) \
77        return 0; // placate gcc's warnings. never reached.
78
79#else
80
81    #define API_ENTRY(_api) _api
82
83#if DEBUG_CALL_GL_API
84
85    #define CALL_GL_API(_api, ...)                                       \
86        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
87        _c->_api(__VA_ARGS__); \
88        GLenum status = GL_NO_ERROR; \
89        while ((status = glGetError()) != GL_NO_ERROR) { \
90            ALOGD("[" #_api "] 0x%x", status); \
91        }
92
93#elif SYSTRACE_CALL_GL_API
94
95    #define CALL_GL_API(_api, ...)                                       \
96        ATRACE_CALL();                                                   \
97        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
98        _c->_api(__VA_ARGS__);
99
100#else
101
102    #define CALL_GL_API(_api, ...)                                       \
103        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
104        _c->_api(__VA_ARGS__);
105
106#endif
107
108    #define CALL_GL_API_RETURN(_api, ...)                                \
109        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
110        return _c->_api(__VA_ARGS__)
111
112#endif
113
114
115extern "C" {
116#include "gl2_api.in"
117#include "gl2ext_api.in"
118}
119
120#undef API_ENTRY
121#undef CALL_GL_API
122#undef CALL_GL_API_RETURN
123
124/*
125 * glGetString() is special because we expose some extensions in the wrapper
126 */
127
128extern "C" const GLubyte * __glGetString(GLenum name);
129
130const GLubyte * glGetString(GLenum name)
131{
132    const GLubyte * ret = egl_get_string_for_current_context(name);
133    if (ret == NULL) {
134        ret = __glGetString(name);
135    }
136    return ret;
137}
138