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 USE_FAST_TLS_KEY
  44
  45     #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
  46
  47     #define API_ENTRY(_api) __attribute__((naked)) _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             "mov   r0, #0             \n"                       \
  56             "bx    lr                 \n"                       \
  57             :                                                   \
  58             : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
  59               [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
  60             :                                                   \
  61             );
  62
  63     #define CALL_GL_API_RETURN(_api, ...) \
  64         CALL_GL_API(_api, __VA_ARGS__) \
  65         return 0; // placate gcc's warnings. never reached.
  66
  67 #else
  68
  69     #define API_ENTRY(_api) _api
  70
  71     #define CALL_GL_API(_api, ...)                                       \
  72         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
  73         _c->_api(__VA_ARGS__);
  74
  75     #define CALL_GL_API_RETURN(_api, ...)                                \
  76         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
  77         return _c->_api(__VA_ARGS__)
  78
  79 #endif
  80
  81
  82 extern "C" {
  83 #include "gl3_api.in"
  84 #include "gl2ext_api.in"
  85 #include "gl3ext_api.in"
  86 }
  87
  88 #undef API_ENTRY
  89 #undef CALL_GL_API
  90 #undef CALL_GL_API_RETURN
  91
  92 /*
  93  * glGetString() is special because we expose some extensions in the wrapper
  94  */
  95
  96 extern "C" const GLubyte * __glGetString(GLenum name);
  97
  98 const GLubyte * glGetString(GLenum name)
  99 {
 100     const GLubyte * ret = egl_get_string_for_current_context(name);
 101     if (ret == NULL) {
 102         ret = __glGetString(name);
 103     }
 104     return ret;
 105 }