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 <GLES2/gl2.h>
  24 #include <GLES2/gl2ext.h>
  25
  26 #include <cutils/log.h>
  27 #include <cutils/properties.h>
  28
  29 #include "hooks.h"
  30 #include "egl_impl.h"
  31
  32 using namespace android;
  33
  34 // ----------------------------------------------------------------------------
  35 // Actual GL entry-points
  36 // ----------------------------------------------------------------------------
  37
  38 #undef API_ENTRY
  39 #undef CALL_GL_API
  40 #undef CALL_GL_API_RETURN
  41
  42 #if USE_FAST_TLS_KEY
  43
  44     #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
  45
  46     #define API_ENTRY(_api) __attribute__((naked)) _api
  47
  48     #define CALL_GL_API(_api, ...)                              \
  49          asm volatile(                                          \
  50             GET_TLS(r12)                                        \
  51             "ldr   r12, [r12, %[tls]] \n"                       \
  52             "cmp   r12, #0            \n"                       \
  53             "ldrne pc,  [r12, %[api]] \n"                       \
  54             "mov   r0, #0             \n"                       \
  55             "bx    lr                 \n"                       \
  56             :                                                   \
  57             : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
  58               [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
  59             :                                                   \
  60             );
  61
  62     #define CALL_GL_API_RETURN(_api, ...) \
  63         CALL_GL_API(_api, __VA_ARGS__) \
  64         return 0; // placate gcc's warnings. never reached.
  65
  66 #else
  67
  68     #define API_ENTRY(_api) _api
  69
  70     #define CALL_GL_API(_api, ...)                                       \
  71         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
  72         _c->_api(__VA_ARGS__);
  73
  74     #define CALL_GL_API_RETURN(_api, ...)                                \
  75         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
  76         return _c->_api(__VA_ARGS__)
  77
  78 #endif
  79
  80
  81 extern "C" {
  82 #include "gl2_api.in"
  83 #include "gl2ext_api.in"
  84 }
  85
  86 #undef API_ENTRY
  87 #undef CALL_GL_API
  88 #undef CALL_GL_API_RETURN
  89
  90 /*
  91  * glGetString() is special because we expose some extensions in the wrapper
  92  */
  93
  94 extern "C" const GLubyte * __glGetString(GLenum name);
  95
  96 const GLubyte * glGetString(GLenum name)
  97 {
  98     const GLubyte * ret = egl_get_string_for_current_context(name);
  99     if (ret == NULL) {
 100         ret = __glGetString(name);
 101     }
 102     return ret;
 103 }