1/*
2 ** Copyright 2009, 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 <stdlib.h>
19#include <errno.h>
20
21#include <cutils/log.h>
22
23#include "egldefs.h"
24
25// ----------------------------------------------------------------------------
26namespace android {
27// ----------------------------------------------------------------------------
28
29#undef API_ENTRY
30#undef CALL_GL_EXTENSION_API
31#undef GL_EXTENSION
32#undef GL_EXTENSION_NAME
33#undef GL_EXTENSION_ARRAY
34#undef GL_EXTENSION_LIST
35#undef GET_TLS
36
37#if defined(__arm__)
38
39    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
40
41    #define API_ENTRY(_api) __attribute__((naked)) _api
42
43    #define CALL_GL_EXTENSION_API(_api)                         \
44         asm volatile(                                          \
45            GET_TLS(r12)                                        \
46            "ldr   r12, [r12, %[tls]] \n"                       \
47            "cmp   r12, #0            \n"                       \
48            "addne r12, %[api]        \n"                       \
49            "ldrne r12, [r12, %[ext]] \n"                       \
50            "cmpne r12, #0            \n"                       \
51            "bxne  r12                \n"                       \
52            "bx    lr                 \n"                       \
53            :                                                   \
54            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
55              [ext] "J"(__builtin_offsetof(gl_hooks_t,          \
56                                      ext.extensions[0])),      \
57              [api] "J"(_api*sizeof(void*))                     \
58            : "r12"                                             \
59            );
60
61#elif defined(__aarch64__)
62
63    #define API_ENTRY(_api) __attribute__((noinline)) _api
64
65    #define CALL_GL_EXTENSION_API(_api)                             \
66        asm volatile(                                               \
67            "mrs x16, tpidr_el0\n"                                  \
68            "ldr x16, [x16, %[tls]]\n"                              \
69            "cbz x16, 1f\n"                                         \
70            "ldr x16, [x16, %[api]]\n"                              \
71            "cbz x16, 1f\n"                                         \
72            "br  x16\n"                                             \
73            "1:\n"                                                  \
74            :                                                       \
75            : [tls] "i" (TLS_SLOT_OPENGL_API * sizeof(void*)),      \
76              [api] "i" (__builtin_offsetof(gl_hooks_t,             \
77                                        ext.extensions[_api]))      \
78            : "x16"                                                 \
79        );
80
81#elif defined(__i386__)
82
83    #define API_ENTRY(_api) __attribute__((noinline,optimize("omit-frame-pointer"))) _api
84
85    #define CALL_GL_EXTENSION_API(_api)                         \
86         register void** fn;                                    \
87         __asm__ volatile(                                      \
88            "mov %%gs:0, %[fn]\n"                               \
89            "mov %P[tls](%[fn]), %[fn]\n"                       \
90            "test %[fn], %[fn]\n"                               \
91            "cmovne %P[api](%[fn]), %[fn]\n"                    \
92            "test %[fn], %[fn]\n"                               \
93            "je 1f\n"                                           \
94            "jmp *%[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,         \
99                                      ext.extensions[_api]))    \
100            : "cc"                                              \
101            );
102
103#elif defined(__x86_64__)
104
105    #define API_ENTRY(_api) __attribute__((noinline,optimize("omit-frame-pointer"))) _api
106
107    #define CALL_GL_EXTENSION_API(_api)                         \
108         register void** fn;                                    \
109         __asm__ volatile(                                      \
110            "mov %%fs:0, %[fn]\n"                               \
111            "mov %P[tls](%[fn]), %[fn]\n"                       \
112            "test %[fn], %[fn]\n"                               \
113            "cmovne %P[api](%[fn]), %[fn]\n"                    \
114            "test %[fn], %[fn]\n"                               \
115            "je 1f\n"                                           \
116            "jmp *%[fn]\n"                                      \
117            "1:\n"                                              \
118            : [fn] "=r" (fn)                                    \
119            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),    \
120              [api] "i" (__builtin_offsetof(gl_hooks_t,         \
121                                      ext.extensions[_api]))    \
122            : "cc"                                              \
123            );
124
125#elif defined(__mips64)
126
127        #define API_ENTRY(_api) __attribute__((noinline)) _api
128
129        #define CALL_GL_EXTENSION_API(_api, ...)                    \
130            register unsigned int _t0 asm("$12");                   \
131            register unsigned int _fn asm("$25");                   \
132            register unsigned int _tls asm("$3");                   \
133            asm volatile(                                           \
134                ".set  push\n\t"                                    \
135                ".set  noreorder\n\t"                               \
136                "rdhwr %[tls], $29\n\t"                             \
137                "ld    %[t0], %[OPENGL_API](%[tls])\n\t"            \
138                "beqz  %[t0], 1f\n\t"                               \
139                " move %[fn], $ra\n\t"                              \
140                "ld    %[t0], %[API](%[t0])\n\t"                    \
141                "beqz  %[t0], 1f\n\t"                               \
142                " nop\n\t"                                          \
143                "move  %[fn], %[t0]\n\t"                            \
144                "1:\n\t"                                            \
145                "jalr  $0, %[fn]\n\t"                               \
146                " nop\n\t"                                          \
147                ".set  pop\n\t"                                     \
148                : [fn] "=c"(_fn),                                   \
149                  [tls] "=&r"(_tls),                                \
150                  [t0] "=&r"(_t0)                                   \
151                : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),          \
152                  [API] "I"(__builtin_offsetof(gl_hooks_t,          \
153                                          ext.extensions[_api]))    \
154                :                                                   \
155            );
156
157#elif defined(__mips__)
158
159        #define API_ENTRY(_api) __attribute__((noinline)) _api
160
161        #define CALL_GL_EXTENSION_API(_api, ...)                    \
162            register unsigned int _t0 asm("$8");                    \
163            register unsigned int _fn asm("$25");                    \
164            register unsigned int _tls asm("$3");                   \
165            asm volatile(                                           \
166                ".set  push\n\t"                                    \
167                ".set  noreorder\n\t"                               \
168                ".set  mips32r2\n\t"                                \
169                "rdhwr %[tls], $29\n\t"                             \
170                "lw    %[t0], %[OPENGL_API](%[tls])\n\t"            \
171                "beqz  %[t0], 1f\n\t"                               \
172                " move %[fn], $ra\n\t"                              \
173                "lw    %[t0], %[API](%[t0])\n\t"                    \
174                "beqz  %[t0], 1f\n\t"                               \
175                " nop\n\t"                                          \
176                "move  %[fn], %[t0]\n\t"                            \
177                "1:\n\t"                                            \
178                "jalr  $0, %[fn]\n\t"                               \
179                " nop\n\t"                                          \
180                ".set  pop\n\t"                                     \
181                : [fn] "=c"(_fn),                                   \
182                  [tls] "=&r"(_tls),                                \
183                  [t0] "=&r"(_t0)                                   \
184                : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),          \
185                  [API] "I"(__builtin_offsetof(gl_hooks_t,          \
186                                          ext.extensions[_api]))    \
187                :                                                   \
188            );
189
190#endif
191
192#if defined(CALL_GL_EXTENSION_API)
193    #define GL_EXTENSION_NAME(_n)   __glExtFwd##_n
194
195    #define GL_EXTENSION(_n)                         \
196        void API_ENTRY(GL_EXTENSION_NAME(_n))() {    \
197            CALL_GL_EXTENSION_API(_n);               \
198        }
199#else
200        #define GL_EXTENSION_NAME(_n) NULL
201
202        #define GL_EXTENSION(_n)
203
204        #warning "eglGetProcAddress() partially supported"
205#endif
206
207
208#define GL_EXTENSION_LIST(name) \
209    name(0)   name(1)   name(2)   name(3)   name(4)   name(5)   name(6)   name(7)  \
210    name(8)   name(9)   name(10)  name(11)  name(12)  name(13)  name(14)  name(15) \
211    name(16)  name(17)  name(18)  name(19)  name(20)  name(21)  name(22)  name(23) \
212    name(24)  name(25)  name(26)  name(27)  name(28)  name(29)  name(30)  name(31) \
213    name(32)  name(33)  name(34)  name(35)  name(36)  name(37)  name(38)  name(39) \
214    name(40)  name(41)  name(42)  name(43)  name(44)  name(45)  name(46)  name(47) \
215    name(48)  name(49)  name(50)  name(51)  name(52)  name(53)  name(54)  name(55) \
216    name(56)  name(57)  name(58)  name(59)  name(60)  name(61)  name(62)  name(63) \
217    name(64)  name(65)  name(66)  name(67)  name(68)  name(69)  name(70)  name(71) \
218    name(72)  name(73)  name(74)  name(75)  name(76)  name(77)  name(78)  name(79) \
219    name(80)  name(81)  name(82)  name(83)  name(84)  name(85)  name(86)  name(87) \
220    name(88)  name(89)  name(90)  name(91)  name(92)  name(93)  name(94)  name(95) \
221    name(96)  name(97)  name(98)  name(99)  \
222    name(100) name(101) name(102) name(103) name(104) name(105) name(106) name(107) \
223    name(108) name(109) name(110) name(111) name(112) name(113) name(114) name(115) \
224    name(116) name(117) name(118) name(119) name(120) name(121) name(122) name(123) \
225    name(124) name(125) name(126) name(127) name(128) name(129) name(130) name(131) \
226    name(132) name(133) name(134) name(135) name(136) name(137) name(138) name(139) \
227    name(140) name(141) name(142) name(143) name(144) name(145) name(146) name(147) \
228    name(148) name(149) name(150) name(151) name(152) name(153) name(154) name(155) \
229    name(156) name(157) name(158) name(159) name(160) name(161) name(162) name(163) \
230    name(164) name(165) name(166) name(167) name(168) name(169) name(170) name(171) \
231    name(172) name(173) name(174) name(175) name(176) name(177) name(178) name(179) \
232    name(180) name(181) name(182) name(183) name(184) name(185) name(186) name(187) \
233    name(188) name(189) name(190) name(191) name(192) name(193) name(194) name(195) \
234    name(196) name(197) name(198) name(199) \
235    name(200) name(201) name(202) name(203) name(204) name(205) name(206) name(207) \
236    name(208) name(209) name(210) name(211) name(212) name(213) name(214) name(215) \
237    name(216) name(217) name(218) name(219) name(220) name(221) name(222) name(223) \
238    name(224) name(225) name(226) name(227) name(228) name(229) name(230) name(231) \
239    name(232) name(233) name(234) name(235) name(236) name(237) name(238) name(239) \
240    name(240) name(241) name(242) name(243) name(244) name(245) name(246) name(247) \
241    name(248) name(249) name(250) name(251) name(252) name(253) name(254) name(255)
242
243
244GL_EXTENSION_LIST( GL_EXTENSION )
245
246#define GL_EXTENSION_ARRAY(_n)  GL_EXTENSION_NAME(_n),
247
248extern const __eglMustCastToProperFunctionPointerType gExtensionForwarders[MAX_NUMBER_OF_GL_EXTENSIONS] = {
249        GL_EXTENSION_LIST( GL_EXTENSION_ARRAY )
250 };
251
252#undef GET_TLS
253#undef GL_EXTENSION_LIST
254#undef GL_EXTENSION_ARRAY
255#undef GL_EXTENSION_NAME
256#undef GL_EXTENSION
257#undef API_ENTRY
258#undef CALL_GL_EXTENSION_API
259
260// ----------------------------------------------------------------------------
261}; // namespace android
262// ----------------------------------------------------------------------------
263
264