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      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 #ifndef ANDROID_GLES_CM_HOOKS_H
     18 #define ANDROID_GLES_CM_HOOKS_H
     19 
     20 #include <ctype.h>
     21 #include <string.h>
     22 #include <errno.h>
     23 
     24 #include <pthread.h>
     25 
     26 #include <EGL/egl.h>
     27 #include <EGL/eglext.h>
     28 #include <GLES/gl.h>
     29 #include <GLES/glext.h>
     30 #include <GLES2/gl2.h>
     31 #include <GLES2/gl2ext.h>
     32 #include <GLES3/gl3.h>
     33 #include <GLES3/gl3ext.h>
     34 
     35 // set to 1 for debugging
     36 #define USE_SLOW_BINDING    0
     37 
     38 #undef NELEM
     39 #define NELEM(x)            (sizeof(x)/sizeof(*(x)))
     40 
     41 // maximum number of GL extensions that can be used simultaneously in
     42 // a given process. this limitation exists because we need to have
     43 // a static function for each extension and currently these static functions
     44 // are generated at compile time.
     45 #define MAX_NUMBER_OF_GL_EXTENSIONS 256
     46 
     47 
     48 #include <bionic_tls.h>  /* special private C library header */
     49 
     50 // ----------------------------------------------------------------------------
     51 namespace android {
     52 // ----------------------------------------------------------------------------
     53 
     54 // GL / EGL hooks
     55 
     56 #undef GL_ENTRY
     57 #undef EGL_ENTRY
     58 #define GL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
     59 #define EGL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
     60 
     61 struct egl_t {
     62     #include "EGL/egl_entries.in"
     63 };
     64 
     65 struct gl_hooks_t {
     66     struct gl_t {
     67         #include "entries.in"
     68     } gl;
     69     struct gl_ext_t {
     70         __eglMustCastToProperFunctionPointerType extensions[MAX_NUMBER_OF_GL_EXTENSIONS];
     71     } ext;
     72 };
     73 #undef GL_ENTRY
     74 #undef EGL_ENTRY
     75 
     76 EGLAPI void setGlThreadSpecific(gl_hooks_t const *value);
     77 
     78 // We have a dedicated TLS slot in bionic
     79 inline gl_hooks_t const * volatile * get_tls_hooks() {
     80     volatile void *tls_base = __get_tls();
     81     gl_hooks_t const * volatile * tls_hooks =
     82             reinterpret_cast<gl_hooks_t const * volatile *>(tls_base);
     83     return tls_hooks;
     84 }
     85 
     86 inline EGLAPI gl_hooks_t const* getGlThreadSpecific() {
     87     gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
     88     gl_hooks_t const* hooks = tls_hooks[TLS_SLOT_OPENGL_API];
     89     return hooks;
     90 }
     91 
     92 // ----------------------------------------------------------------------------
     93 }; // namespace android
     94 // ----------------------------------------------------------------------------
     95 
     96 #endif /* ANDROID_GLES_CM_HOOKS_H */
     97