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            "ldrne r12, [r12, %[api]] \n"                       \
49            "cmpne r12, #0            \n"                       \
50            "bxne  r12                \n"                       \
51            "bx    lr                 \n"                       \
52            :                                                   \
53            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
54              [api] "J"(__builtin_offsetof(gl_hooks_t,          \
55                                      ext.extensions[_api]))    \
56            : "r12"                                             \
57            );
58
59#elif defined(__aarch64__)
60
61    #define API_ENTRY(_api) __attribute__((noinline)) _api
62
63    #define CALL_GL_EXTENSION_API(_api)                             \
64        asm volatile(                                               \
65            "mrs x16, tpidr_el0\n"                                  \
66            "ldr x16, [x16, %[tls]]\n"                              \
67            "cbz x16, 1f\n"                                         \
68            "ldr x16, [x16, %[api]]\n"                              \
69            "cbz x16, 1f\n"                                         \
70            "br  x16\n"                                             \
71            "1:\n"                                                  \
72            :                                                       \
73            : [tls] "i" (TLS_SLOT_OPENGL_API * sizeof(void*)),      \
74              [api] "i" (__builtin_offsetof(gl_hooks_t,             \
75                                        ext.extensions[_api]))      \
76            : "x16"                                                 \
77        );
78
79#elif defined(__i386__)
80
81    #define API_ENTRY(_api) __attribute__((noinline)) _api
82
83    #define CALL_GL_EXTENSION_API(_api)                         \
84         register void** fn;                                    \
85         __asm__ volatile(                                      \
86            "mov %%gs:0, %[fn]\n"                               \
87            "mov %P[tls](%[fn]), %[fn]\n"                       \
88            "test %[fn], %[fn]\n"                               \
89            "cmovne %P[api](%[fn]), %[fn]\n"                    \
90            "test %[fn], %[fn]\n"                               \
91            "je 1f\n"                                           \
92            "jmp *%[fn]\n"                                      \
93            "1:\n"                                              \
94            : [fn] "=r" (fn)                                    \
95            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),    \
96              [api] "i" (__builtin_offsetof(gl_hooks_t,         \
97                                      ext.extensions[_api]))    \
98            : "cc"                                              \
99            );
100
101#elif defined(__x86_64__)
102
103    #define API_ENTRY(_api) __attribute__((noinline)) _api
104
105    #define CALL_GL_EXTENSION_API(_api)                         \
106         register void** fn;                                    \
107         __asm__ volatile(                                      \
108            "mov %%fs:0, %[fn]\n"                               \
109            "mov %P[tls](%[fn]), %[fn]\n"                       \
110            "test %[fn], %[fn]\n"                               \
111            "cmovne %P[api](%[fn]), %[fn]\n"                    \
112            "test %[fn], %[fn]\n"                               \
113            "je 1f\n"                                           \
114            "jmp *%[fn]\n"                                      \
115            "1:\n"                                              \
116            : [fn] "=r" (fn)                                    \
117            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),    \
118              [api] "i" (__builtin_offsetof(gl_hooks_t,         \
119                                      ext.extensions[_api]))    \
120            : "cc"                                              \
121            );
122
123#elif defined(__mips__)
124
125        #define API_ENTRY(_api) __attribute__((noinline)) _api
126
127        #define CALL_GL_EXTENSION_API(_api, ...)                    \
128            register unsigned int _t0 asm("t0");                    \
129            register unsigned int _fn asm("t1");                    \
130            register unsigned int _tls asm("v1");                   \
131            asm volatile(                                           \
132                ".set  push\n\t"                                    \
133                ".set  noreorder\n\t"                               \
134                ".set  mips32r2\n\t"                                \
135                "rdhwr %[tls], $29\n\t"                             \
136                "lw    %[t0], %[OPENGL_API](%[tls])\n\t"            \
137                "beqz  %[t0], 1f\n\t"                               \
138                " move %[fn], $ra\n\t"                              \
139                "lw    %[fn], %[API](%[t0])\n\t"                    \
140                "movz  %[fn], $ra, %[fn]\n\t"                       \
141                "1:\n\t"                                            \
142                "j     %[fn]\n\t"                                   \
143                " nop\n\t"                                          \
144                ".set  pop\n\t"                                     \
145                : [fn] "=c"(_fn),                                   \
146                  [tls] "=&r"(_tls),                                \
147                  [t0] "=&r"(_t0)                                   \
148                : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),          \
149                  [API] "I"(__builtin_offsetof(gl_hooks_t,          \
150                                          ext.extensions[_api]))    \
151                :                                                   \
152            );
153
154#endif
155
156#if defined(CALL_GL_EXTENSION_API)
157    #define GL_EXTENSION_NAME(_n)   __glExtFwd##_n
158
159    #define GL_EXTENSION(_n)                         \
160        void API_ENTRY(GL_EXTENSION_NAME(_n))() {    \
161            CALL_GL_EXTENSION_API(_n);               \
162        }
163#else
164        #define GL_EXTENSION_NAME(_n) NULL
165
166        #define GL_EXTENSION(_n)
167
168        #warning "eglGetProcAddress() partially supported"
169#endif
170
171
172#define GL_EXTENSION_LIST(name) \
173    name(0)   name(1)   name(2)   name(3)   name(4)   name(5)   name(6)   name(7)  \
174    name(8)   name(9)   name(10)  name(11)  name(12)  name(13)  name(14)  name(15) \
175    name(16)  name(17)  name(18)  name(19)  name(20)  name(21)  name(22)  name(23) \
176    name(24)  name(25)  name(26)  name(27)  name(28)  name(29)  name(30)  name(31) \
177    name(32)  name(33)  name(34)  name(35)  name(36)  name(37)  name(38)  name(39) \
178    name(40)  name(41)  name(42)  name(43)  name(44)  name(45)  name(46)  name(47) \
179    name(48)  name(49)  name(50)  name(51)  name(52)  name(53)  name(54)  name(55) \
180    name(56)  name(57)  name(58)  name(59)  name(60)  name(61)  name(62)  name(63) \
181    name(64)  name(65)  name(66)  name(67)  name(68)  name(69)  name(70)  name(71) \
182    name(72)  name(73)  name(74)  name(75)  name(76)  name(77)  name(78)  name(79) \
183    name(80)  name(81)  name(82)  name(83)  name(84)  name(85)  name(86)  name(87) \
184    name(88)  name(89)  name(90)  name(91)  name(92)  name(93)  name(94)  name(95) \
185    name(96)  name(97)  name(98)  name(99)  \
186    name(100) name(101) name(102) name(103) name(104) name(105) name(106) name(107) \
187    name(108) name(109) name(110) name(111) name(112) name(113) name(114) name(115) \
188    name(116) name(117) name(118) name(119) name(120) name(121) name(122) name(123) \
189    name(124) name(125) name(126) name(127) name(128) name(129) name(130) name(131) \
190    name(132) name(133) name(134) name(135) name(136) name(137) name(138) name(139) \
191    name(140) name(141) name(142) name(143) name(144) name(145) name(146) name(147) \
192    name(148) name(149) name(150) name(151) name(152) name(153) name(154) name(155) \
193    name(156) name(157) name(158) name(159) name(160) name(161) name(162) name(163) \
194    name(164) name(165) name(166) name(167) name(168) name(169) name(170) name(171) \
195    name(172) name(173) name(174) name(175) name(176) name(177) name(178) name(179) \
196    name(180) name(181) name(182) name(183) name(184) name(185) name(186) name(187) \
197    name(188) name(189) name(190) name(191) name(192) name(193) name(194) name(195) \
198    name(196) name(197) name(198) name(199) \
199    name(200) name(201) name(202) name(203) name(204) name(205) name(206) name(207) \
200    name(208) name(209) name(210) name(211) name(212) name(213) name(214) name(215) \
201    name(216) name(217) name(218) name(219) name(220) name(221) name(222) name(223) \
202    name(224) name(225) name(226) name(227) name(228) name(229) name(230) name(231) \
203    name(232) name(233) name(234) name(235) name(236) name(237) name(238) name(239) \
204    name(240) name(241) name(242) name(243) name(244) name(245) name(246) name(247) \
205    name(248) name(249) name(250) name(251) name(252) name(253) name(254) name(255)
206
207
208GL_EXTENSION_LIST( GL_EXTENSION )
209
210#define GL_EXTENSION_ARRAY(_n)  GL_EXTENSION_NAME(_n),
211
212extern const __eglMustCastToProperFunctionPointerType gExtensionForwarders[MAX_NUMBER_OF_GL_EXTENSIONS] = {
213        GL_EXTENSION_LIST( GL_EXTENSION_ARRAY )
214 };
215
216#undef GET_TLS
217#undef GL_EXTENSION_LIST
218#undef GL_EXTENSION_ARRAY
219#undef GL_EXTENSION_NAME
220#undef GL_EXTENSION
221#undef API_ENTRY
222#undef CALL_GL_EXTENSION_API
223
224// ----------------------------------------------------------------------------
225}; // namespace android
226// ----------------------------------------------------------------------------
227
228