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   #if defined(__arm__)
  45
  46     #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
  47
  48     #define API_ENTRY(_api) __attribute__((naked)) _api
  49
  50     #define CALL_GL_API(_api, ...)                              \
  51          asm volatile(                                          \
  52             GET_TLS(r12)                                        \
  53             "ldr   r12, [r12, %[tls]] \n"                       \
  54             "cmp   r12, #0            \n"                       \
  55             "ldrne pc,  [r12, %[api]] \n"                       \
  56             "mov   r0, #0             \n"                       \
  57             "bx    lr                 \n"                       \
  58             :                                                   \
  59             : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
  60               [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
  61             :                                                   \
  62             );
  63
  64   #elif defined(__mips__)
  65
  66     #define API_ENTRY(_api) __attribute__((noinline)) _api
  67
  68     #define CALL_GL_API(_api, ...)                               \
  69         register unsigned int t0 asm("t0");                      \
  70         register unsigned int fn asm("t1");                      \
  71         register unsigned int tls asm("v1");                     \
  72         register unsigned int v0 asm("v0");                      \
  73         asm volatile(                                            \
  74             ".set  push\n\t"                                     \
  75             ".set  noreorder\n\t"                                \
  76             ".set mips32r2\n\t"                                  \
  77             "rdhwr %[tls], $29\n\t"                              \
  78             "lw    %[t0], %[OPENGL_API](%[tls])\n\t"             \
  79             "beqz  %[t0], 1f\n\t"                                \
  80             " move %[fn],$ra\n\t"                                \
  81             "lw    %[fn], %[API](%[t0])\n\t"                     \
  82             "movz  %[fn], $ra, %[fn]\n\t"                        \
  83             "1:\n\t"                                             \
  84             "j     %[fn]\n\t"                                    \
  85             " move %[v0], $0\n\t"                                \
  86             ".set  pop\n\t"                                      \
  87             : [fn] "=c"(fn),                                     \
  88               [tls] "=&r"(tls),                                  \
  89               [t0] "=&r"(t0),                                    \
  90               [v0] "=&r"(v0)                                     \
  91             : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),           \
  92               [API] "I"(__builtin_offsetof(gl_hooks_t, gl._api)) \
  93             :                                                    \
  94             );
  95
  96   #else
  97
  98     #error Unsupported architecture
  99
 100   #endif
 101
 102     #define CALL_GL_API_RETURN(_api, ...) \
 103         CALL_GL_API(_api, __VA_ARGS__) \
 104         return 0; // placate gcc's warnings. never reached.
 105
 106 #else
 107
 108     #define API_ENTRY(_api) _api
 109
 110     #define CALL_GL_API(_api, ...)                                       \
 111         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 112         _c->_api(__VA_ARGS__);
 113
 114     #define CALL_GL_API_RETURN(_api, ...)                                \
 115         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 116         return _c->_api(__VA_ARGS__)
 117
 118 #endif
 119
 120
 121 extern "C" {
 122 #include "gl2_api.in"
 123 #include "gl2ext_api.in"
 124 }
 125
 126 #undef API_ENTRY
 127 #undef CALL_GL_API
 128 #undef CALL_GL_API_RETURN
 129
 130 /*
 131  * glGetString() is special because we expose some extensions in the wrapper
 132  */
 133
 134 extern "C" const GLubyte * __glGetString(GLenum name);
 135
 136 const GLubyte * glGetString(GLenum name)
 137 {
 138     const GLubyte * ret = egl_get_string_for_current_context(name);
 139     if (ret == NULL) {
 140         ret = __glGetString(name);
 141     }
 142     return ret;
 143 }