getProcAddress.cpp revision 1cadb25da1ed875bdd078270e642966724a0c39a
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#include "hooks.h" 25 26// ---------------------------------------------------------------------------- 27namespace android { 28// ---------------------------------------------------------------------------- 29 30#undef API_ENTRY 31#undef CALL_GL_EXTENSION_API 32#undef GL_EXTENSION 33#undef GL_EXTENSION_NAME 34#undef GL_EXTENSION_ARRAY 35#undef GL_EXTENSION_LIST 36#undef GET_TLS 37 38#if USE_FAST_TLS_KEY 39 40 #ifdef HAVE_ARM_TLS_REGISTER 41 #define GET_TLS(reg) \ 42 "mrc p15, 0, " #reg ", c13, c0, 3 \n" 43 #else 44 #define GET_TLS(reg) \ 45 "mov " #reg ", #0xFFFF0FFF \n" \ 46 "ldr " #reg ", [" #reg ", #-15] \n" 47 #endif 48 49 #define API_ENTRY(_api) __attribute__((naked)) _api 50 51 #define CALL_GL_EXTENSION_API(_api) \ 52 asm volatile( \ 53 GET_TLS(r12) \ 54 "ldr r12, [r12, %[tls]] \n" \ 55 "cmp r12, #0 \n" \ 56 "ldrne r12, [r12, %[api]] \n" \ 57 "cmpne r12, #0 \n" \ 58 "bxne r12 \n" \ 59 "bx lr \n" \ 60 : \ 61 : [tls] "J"(TLS_SLOT_OPENGL_API*4), \ 62 [api] "J"(__builtin_offsetof(gl_hooks_t, \ 63 ext.extensions[_api])) \ 64 : \ 65 ); 66 67 #define GL_EXTENSION_NAME(_n) __glExtFwd##_n 68 69 #define GL_EXTENSION(_n) \ 70 void API_ENTRY(GL_EXTENSION_NAME(_n))() { \ 71 CALL_GL_EXTENSION_API(_n); \ 72 } 73 74 75#else 76 77 #define GL_EXTENSION_NAME(_n) NULL 78 79 #define GL_EXTENSION(_n) 80 81 #warning "eglGetProcAddress() partially supported" 82 83#endif 84 85#define GL_EXTENSION_LIST(name) \ 86 name(0) name(1) name(2) name(3) \ 87 name(4) name(5) name(6) name(7) \ 88 name(8) name(9) name(10) name(11) \ 89 name(12) name(13) name(14) name(15) \ 90 name(16) name(17) name(18) name(19) \ 91 name(20) name(21) name(22) name(23) \ 92 name(24) name(25) name(26) name(27) \ 93 name(28) name(29) name(30) name(31) \ 94 name(32) name(33) name(34) name(35) \ 95 name(36) name(37) name(38) name(39) \ 96 name(40) name(41) name(42) name(43) \ 97 name(44) name(45) name(46) name(47) \ 98 name(48) name(49) name(50) name(51) \ 99 name(52) name(53) name(54) name(55) \ 100 name(56) name(57) name(58) name(59) \ 101 name(60) name(61) name(62) name(63) 102 103 104GL_EXTENSION_LIST( GL_EXTENSION ) 105 106#define GL_EXTENSION_ARRAY(_n) GL_EXTENSION_NAME(_n), 107 108extern const __eglMustCastToProperFunctionPointerType gExtensionForwarders[MAX_NUMBER_OF_GL_EXTENSIONS] = { 109 GL_EXTENSION_LIST( GL_EXTENSION_ARRAY ) 110 }; 111 112#undef GET_TLS 113#undef GL_EXTENSION_LIST 114#undef GL_EXTENSION_ARRAY 115#undef GL_EXTENSION_NAME 116#undef GL_EXTENSION 117#undef API_ENTRY 118#undef CALL_GL_EXTENSION_API 119 120// ---------------------------------------------------------------------------- 121}; // namespace android 122// ---------------------------------------------------------------------------- 123 124