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 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
  30 #include <utils/Trace.h>
  31
  32 #include <utils/CallStack.h>
  33
  34 #include "hooks.h"
  35 #include "egl_impl.h"
  36
  37 using namespace android;
  38
  39 // ----------------------------------------------------------------------------
  40 // Actual GL entry-points
  41 // ----------------------------------------------------------------------------
  42
  43 #undef API_ENTRY
  44 #undef CALL_GL_API
  45 #undef CALL_GL_API_RETURN
  46
  47 #define DEBUG_CALL_GL_API 0
  48 #define DEBUG_PRINT_CALL_STACK_ON_ERROR 0
  49 #define SYSTRACE_CALL_GL_API 0
  50
  51 #if USE_FAST_TLS_KEY
  52
  53     #ifdef HAVE_ARM_TLS_REGISTER
  54         #define GET_TLS(reg) \
  55             "mrc p15, 0, " #reg ", c13, c0, 3 \n"
  56     #else
  57         #define GET_TLS(reg) \
  58             "mov   " #reg ", #0xFFFF0FFF      \n"  \
  59             "ldr   " #reg ", [" #reg ", #-15] \n"
  60     #endif
  61
  62     #define API_ENTRY(_api) __attribute__((naked)) _api
  63
  64     #define CALL_GL_API(_api, ...)                              \
  65          asm volatile(                                          \
  66             GET_TLS(r12)                                        \
  67             "ldr   r12, [r12, %[tls]] \n"                       \
  68             "cmp   r12, #0            \n"                       \
  69             "ldrne pc,  [r12, %[api]] \n"                       \
  70             "mov   r0, #0             \n"                       \
  71             "bx    lr                 \n"                       \
  72             :                                                   \
  73             : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
  74               [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
  75             :                                                   \
  76             );
  77
  78     #define CALL_GL_API_RETURN(_api, ...) \
  79         CALL_GL_API(_api, __VA_ARGS__) \
  80         return 0; // placate gcc's warnings. never reached.
  81
  82 #else
  83
  84     #define API_ENTRY(_api) _api
  85
  86 #if DEBUG_CALL_GL_API
  87
  88     #define CALL_GL_API(_api, ...)                                       \
  89         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
  90         _c->_api(__VA_ARGS__); \
  91         GLenum status = GL_NO_ERROR; \
  92         bool error = false; \
  93         while ((status = glGetError()) != GL_NO_ERROR) { \
  94             ALOGD("[" #_api "] 0x%x", status); \
  95             error = true; \
  96         } \
  97         if (DEBUG_PRINT_CALL_STACK_ON_ERROR && error) { \
  98             CallStack s; \
  99             s.update(); \
 100             s.dump("glGetError:" #_api); \
 101         }
 102
 103 #elif SYSTRACE_CALL_GL_API
 104
 105     #define CALL_GL_API(_api, ...)                                       \
 106         ATRACE_CALL();                                                   \
 107         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 108         _c->_api(__VA_ARGS__);
 109
 110 #else
 111
 112     #define CALL_GL_API(_api, ...)                                       \
 113         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 114         _c->_api(__VA_ARGS__);
 115
 116 #endif
 117
 118     #define CALL_GL_API_RETURN(_api, ...)                                \
 119         gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
 120         return _c->_api(__VA_ARGS__)
 121
 122 #endif
 123
 124
 125 extern "C" {
 126 #include "gl2_api.in"
 127 #include "gl2ext_api.in"
 128 }
 129
 130 #undef API_ENTRY
 131 #undef CALL_GL_API
 132 #undef CALL_GL_API_RETURN
 133
 134 /*
 135  * glGetString() is special because we expose some extensions in the wrapper
 136  */
 137
 138 extern "C" const GLubyte * __glGetString(GLenum name);
 139
 140 const GLubyte * glGetString(GLenum name)
 141 {
 142     const GLubyte * ret = egl_get_string_for_current_context(name);
 143     if (ret == NULL) {
 144         ret = __glGetString(name);
 145     }
 146     return ret;
 147 }