gl2.cpp revision 701048cbe8d35fcd7e00c875e128fae022b27607 
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 <cutils/log.h>
24#include <cutils/properties.h>
25
26#include "../hooks.h"
27#include "../egl_impl.h"
28
29using namespace android;
30
31// ----------------------------------------------------------------------------
32// Actual GL entry-points
33// ----------------------------------------------------------------------------
34
35#undef API_ENTRY
36#undef CALL_GL_API
37#undef CALL_GL_API_RETURN
38
39#if USE_SLOW_BINDING
40
41    #define API_ENTRY(_api) _api
42
43    #define CALL_GL_API(_api, ...)                                       \
44        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
45        if (_c) return _c->_api(__VA_ARGS__);
46
47#elif defined(__arm__)
48
49    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
50
51    #define API_ENTRY(_api) __attribute__((noinline)) _api
52
53    #define CALL_GL_API(_api, ...)                              \
54         asm volatile(                                          \
55            GET_TLS(r12)                                        \
56            "ldr   r12, [r12, %[tls]] \n"                       \
57            "cmp   r12, #0            \n"                       \
58            "ldrne pc,  [r12, %[api]] \n"                       \
59            :                                                   \
60            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
61              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
62            : "r12"                                             \
63            );
64
65#elif defined(__aarch64__)
66
67    #define API_ENTRY(_api) __attribute__((noinline)) _api
68
69    #define CALL_GL_API(_api, ...)                                  \
70        asm volatile(                                               \
71            "mrs x16, tpidr_el0\n"                                  \
72            "ldr x16, [x16, %[tls]]\n"                              \
73            "cbz x16, 1f\n"                                         \
74            "ldr x16, [x16, %[api]]\n"                              \
75            "br  x16\n"                                             \
76            "1:\n"                                                  \
77            :                                                       \
78            : [tls] "i" (TLS_SLOT_OPENGL_API * sizeof(void*)),      \
79              [api] "i" (__builtin_offsetof(gl_hooks_t, gl._api))   \
80            : "x16"                                                 \
81        );
82
83#elif defined(__i386__)
84
85    #define API_ENTRY(_api) __attribute__((noinline,optimize("omit-frame-pointer"))) _api
86
87    #define CALL_GL_API(_api, ...)                                  \
88        register void** fn;                                         \
89        __asm__ volatile(                                           \
90            "mov %%gs:0, %[fn]\n"                                   \
91            "mov %P[tls](%[fn]), %[fn]\n"                           \
92            "test %[fn], %[fn]\n"                                   \
93            "je 1f\n"                                               \
94            "jmp *%P[api](%[fn])\n"                                 \
95            "1:\n"                                                  \
96            : [fn] "=r" (fn)                                        \
97            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),        \
98              [api] "i" (__builtin_offsetof(gl_hooks_t, gl._api))   \
99            : "cc"                                                  \
100            );
101
102#elif defined(__x86_64__)
103
104    #define API_ENTRY(_api) __attribute__((noinline,optimize("omit-frame-pointer"))) _api
105
106    #define CALL_GL_API(_api, ...)                                  \
107         register void** fn;                                        \
108         __asm__ volatile(                                          \
109            "mov %%fs:0, %[fn]\n"                                   \
110            "mov %P[tls](%[fn]), %[fn]\n"                           \
111            "test %[fn], %[fn]\n"                                   \
112            "je 1f\n"                                               \
113            "jmp *%P[api](%[fn])\n"                                 \
114            "1:\n"                                                  \
115            : [fn] "=r" (fn)                                        \
116            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),        \
117              [api] "i" (__builtin_offsetof(gl_hooks_t, gl._api))   \
118            : "cc"                                                  \
119            );
120
121#elif defined(__mips__)
122
123    #define API_ENTRY(_api) __attribute__((noinline)) _api
124
125    #define CALL_GL_API(_api, ...)                               \
126        register unsigned int _t0 asm("t0");                     \
127        register unsigned int _fn asm("t1");                     \
128        register unsigned int _tls asm("v1");                    \
129        register unsigned int _v0 asm("v0");                     \
130        asm volatile(                                            \
131            ".set  push\n\t"                                     \
132            ".set  noreorder\n\t"                                \
133            ".set mips32r2\n\t"                                  \
134            "rdhwr %[tls], $29\n\t"                              \
135            "lw    %[t0], %[OPENGL_API](%[tls])\n\t"             \
136            "beqz  %[t0], 1f\n\t"                                \
137            " move %[fn],$ra\n\t"                                \
138            "lw    %[fn], %[API](%[t0])\n\t"                     \
139            "movz  %[fn], $ra, %[fn]\n\t"                        \
140            "1:\n\t"                                             \
141            "j     %[fn]\n\t"                                    \
142            " move %[v0], $0\n\t"                                \
143            ".set  pop\n\t"                                      \
144            : [fn] "=c"(_fn),                                    \
145              [tls] "=&r"(_tls),                                 \
146              [t0] "=&r"(_t0),                                   \
147              [v0] "=&r"(_v0)                                    \
148            : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),           \
149              [API] "I"(__builtin_offsetof(gl_hooks_t, gl._api)) \
150            :                                                    \
151            );
152
153#endif
154
155#define CALL_GL_API_RETURN(_api, ...) \
156    CALL_GL_API(_api, __VA_ARGS__) \
157    return 0;
158
159
160
161extern "C" {
162#pragma GCC diagnostic ignored "-Wunused-parameter"
163#include "gl2_api.in"
164#include "gl2ext_api.in"
165#pragma GCC diagnostic warning "-Wunused-parameter"
166}
167
168#undef API_ENTRY
169#undef CALL_GL_API
170#undef CALL_GL_API_RETURN
171
172/*
173 * glGetString() is special because we expose some extensions in the wrapper
174 */
175
176extern "C" const GLubyte * __glGetString(GLenum name);
177
178const GLubyte * glGetString(GLenum name)
179{
180    const GLubyte * ret = egl_get_string_for_current_context(name);
181    if (ret == NULL) {
182        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;
183        if(_c) ret = _c->glGetString(name);
184    }
185    return ret;
186}
187