opengl/libs/GLES2/gl2.cpp

   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 <GLES3/gl3.h>
  24 #include <GLES3/gl3ext.h>
  25 #include <GLES2/gl2ext.h>
  26
  27 #include <cutils/log.h>
  28 #include <cutils/properties.h>
  29
  30 #include "../hooks.h"
  31 #include "../egl_impl.h"
  32
  33 using namespace android;
  34
  35 // ----------------------------------------------------------------------------
  36 // Actual GL entry-points
  37 // ----------------------------------------------------------------------------
  38
  39 #undef API_ENTRY
  40 #undef CALL_GL_API
  41 #undef CALL_GL_API_RETURN
  42
  43 #if defined(__arm__) && !USE_SLOW_BINDING
  44
  45     #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
  46
  47     #define API_ENTRY(_api) __attribute__((noinline)) _api
  48
  49     #define CALL_GL_API(_api, ...)                              \
  50          asm volatile(                                          \
  51             GET_TLS(r12)                                        \
  52             "ldr   r12, [r12, %[tls]] \n"                       \
  53             "cmp   r12, #0            \n"                       \
  54             "ldrne pc,  [r12, %[api]] \n"                       \
  55             :                                                   \
  56             : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
  57               [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
  58             :                                                   \
  59             );
  60
  61 #elif defined(__i386__) && !USE_SLOW_BINDING
  62
  63     /* Tell gcc 4.4+ to always omit the frame pointer to have working code
  64      * independ of compiler flag
  65      */
  66     #define API_ENTRY(_api) __attribute__((noinline))            \
  67             __attribute__((optimize("omit-frame-pointer")))      \
  68             _api
  69
  70     /* pop %%ebp only because x86 doesn't support naked functions */
  71     /* 4.4+ supports __attribute__((optimize)) that disable function
  72      * prologues
  73      */
  74     #if __GNUC__ < 4 || \
  75     (__GNUC__ == 4 && __GNUC_MINOR__ < 4 )
  76          #define PROLOGUE  "pop %%ebp   \n"
  77     #else
  78          #define PROLOGUE  ""
  79     #endif
  80
  81     #define CALL_GL_API(_api, ...)                              \
  82         asm volatile(                                           \
  83             PROLOGUE                                            \
  84             "movl %%gs:0, %%ecx         \n"                     \
  85             "movl %c[tls](%%ecx), %%eax \n"                     \
  86             "test %%eax, %%eax          \n"                     \
  87             "je out" #_api "            \n"                     \
  88             "movl %c[api](%%eax), %%ecx \n"                     \
  89             "jmp *%%ecx                 \n"                     \
  90             "out" #_api ": ret          \n"                     \
  91             :                                                   \
  92             : [tls] "i"(TLS_SLOT_OPENGL_API*4),                 \
  93               [api] "i"(__builtin_offsetof(gl_hooks_t, gl._api))    \
  94             :                                                   \
  95             );
  96
  97 #elif defined(__mips__) && !USE_SLOW_BINDING
  98
  99     #define API_ENTRY(_api) __attribute__((noinline)) _api
 100
 101     #define CALL_GL_API(_api, ...)                               \
 102         register unsigned int _t0 asm("t0");                     \
 103         register unsigned int _fn asm("t1");                     \
 104         register unsigned int _tls asm("v1");                    \
 105         register unsigned int _v0 asm("v0");                     \
 106         asm volatile(                                            \
 107             ".set  push\n\t"                                     \
 108             ".set  noreorder\n\t"                                \
 109             ".set mips32r2\n\t"                                  \
 110             "rdhwr %[tls], $29\n\t"                              \
 111             "lw    %[t0], %[OPENGL_API](%[tls])\n\t"             \
 112             "beqz  %[t0], 1f\n\t"                                \
 113             " move %[fn],$ra\n\t"                                \
 114             "lw    %[fn], %[API](%[t0])\n\t"                     \
 115             "movz  %[fn], $ra, %[fn]\n\t"                        \
 116             "1:\n\t"                                             \
 117             "j     %[fn]\n\t"                                    \
 118             " move %[v0], $0\n\t"                                \
 119             ".set  pop\n\t"                                      \
 120             : [fn] "=c"(_fn),                                    \
 121               [tls] "=&r"(_tls),                                 \
 122               [t0] "=&r"(_t0),                                   \
 123               [v0] "=&r"(_v0)                                    \
 124             : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),           \
 125               [API] "I"(__builtin_offsetof(gl_hooks_t, gl._api)) \
 126             :                                                    \
 127             );
 128
 129 #else
 130
 131     #define API_ENTRY(_api) _api
 132
 133     #define CALL_GL_API(_api, ...)                                       \
 134         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 135         if (_c) return _c->_api(__VA_ARGS__);
 136
 137 #endif
 138
 139 #define CALL_GL_API_RETURN(_api, ...) \
 140     CALL_GL_API(_api, __VA_ARGS__) \
 141     return 0;
 142
 143
 144
 145 extern "C" {
 146 #include "gl3_api.in"
 147 #include "gl2ext_api.in"
 148 #include "gl3ext_api.in"
 149 }
 150
 151 #undef API_ENTRY
 152 #undef CALL_GL_API
 153 #undef CALL_GL_API_RETURN
 154
 155 /*
 156  * glGetString() is special because we expose some extensions in the wrapper
 157  */
 158
 159 extern "C" const GLubyte * __glGetString(GLenum name);
 160
 161 const GLubyte * glGetString(GLenum name)
 162 {
 163     const GLubyte * ret = egl_get_string_for_current_context(name);
 164     if (ret == NULL) {
 165         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;
 166         ret = _c->glGetString(name);
 167     }
 168     return ret;
 169 }