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   #if defined(__arm__)
  46
  47     #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
  48
  49     #define API_ENTRY(_api) __attribute__((naked)) _api
  50
  51     #define CALL_GL_API(_api, ...)                              \
  52          asm volatile(                                          \
  53             GET_TLS(r12)                                        \
  54             "ldr   r12, [r12, %[tls]] \n"                       \
  55             "cmp   r12, #0            \n"                       \
  56             "ldrne pc,  [r12, %[api]] \n"                       \
  57             "mov   r0, #0             \n"                       \
  58             "bx    lr                 \n"                       \
  59             :                                                   \
  60             : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
  61               [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
  62             :                                                   \
  63             );
  64
  65   #elif defined(__mips__)
  66
  67     #define API_ENTRY(_api) __attribute__((noinline)) _api
  68
  69     #define CALL_GL_API(_api, ...)                               \
  70         register unsigned int _t0 asm("t0");                     \
  71         register unsigned int _fn asm("t1");                     \
  72         register unsigned int _tls asm("v1");                    \
  73         register unsigned int _v0 asm("v0");                     \
  74         asm volatile(                                            \
  75             ".set  push\n\t"                                     \
  76             ".set  noreorder\n\t"                                \
  77             ".set mips32r2\n\t"                                  \
  78             "rdhwr %[tls], $29\n\t"                              \
  79             "lw    %[t0], %[OPENGL_API](%[tls])\n\t"             \
  80             "beqz  %[t0], 1f\n\t"                                \
  81             " move %[fn],$ra\n\t"                                \
  82             "lw    %[fn], %[API](%[t0])\n\t"                     \
  83             "movz  %[fn], $ra, %[fn]\n\t"                        \
  84             "1:\n\t"                                             \
  85             "j     %[fn]\n\t"                                    \
  86             " move %[v0], $0\n\t"                                \
  87             ".set  pop\n\t"                                      \
  88             : [fn] "=c"(_fn),                                    \
  89               [tls] "=&r"(_tls),                                 \
  90               [t0] "=&r"(_t0),                                   \
  91               [v0] "=&r"(_v0)                                    \
  92             : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),           \
  93               [API] "I"(__builtin_offsetof(gl_hooks_t, gl._api)) \
  94             :                                                    \
  95             );
  96
  97   #else
  98
  99     #error Unsupported architecture
 100
 101   #endif
 102
 103     #define CALL_GL_API_RETURN(_api, ...) \
 104         CALL_GL_API(_api, __VA_ARGS__) \
 105         return 0; // placate gcc's warnings. never reached.
 106
 107 #else
 108
 109     #define API_ENTRY(_api) _api
 110
 111     #define CALL_GL_API(_api, ...)                                       \
 112         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 113         _c->_api(__VA_ARGS__);
 114
 115     #define CALL_GL_API_RETURN(_api, ...)                                \
 116         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 117         return _c->_api(__VA_ARGS__)
 118
 119 #endif
 120
 121
 122 extern "C" {
 123 #include "gl3_api.in"
 124 #include "gl2ext_api.in"
 125 #include "gl3ext_api.in"
 126 }
 127
 128 #undef API_ENTRY
 129 #undef CALL_GL_API
 130 #undef CALL_GL_API_RETURN
 131
 132 /*
 133  * glGetString() is special because we expose some extensions in the wrapper
 134  */
 135
 136 extern "C" const GLubyte * __glGetString(GLenum name);
 137
 138 const GLubyte * glGetString(GLenum name)
 139 {
 140     const GLubyte * ret = egl_get_string_for_current_context(name);
 141     if (ret == NULL) {
 142         ret = __glGetString(name);
 143     }
 144     return ret;
 145 }