gl2.cpp revision 8fb47ec10e7f4dad630fcac4ed47d243d4f33375 
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
32using 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    #ifdef HAVE_ARM_TLS_REGISTER
45        #define GET_TLS(reg) \
46            "mrc p15, 0, " #reg ", c13, c0, 3 \n"
47    #else
48        #define GET_TLS(reg) \
49            "mov   " #reg ", #0xFFFF0FFF      \n"  \
50            "ldr   " #reg ", [" #reg ", #-15] \n"
51    #endif
52
53    #define API_ENTRY(_api) __attribute__((naked)) _api
54
55    #define CALL_GL_API(_api, ...)                              \
56         asm volatile(                                          \
57            GET_TLS(r12)                                        \
58            "ldr   r12, [r12, %[tls]] \n"                       \
59            "cmp   r12, #0            \n"                       \
60            "ldrne pc,  [r12, %[api]] \n"                       \
61            "bx    lr                 \n"                       \
62            :                                                   \
63            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
64              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
65            :                                                   \
66            );
67
68    #define CALL_GL_API_RETURN(_api, ...) \
69        CALL_GL_API(_api, __VA_ARGS__) \
70        return 0; // placate gcc's warnings. never reached.
71
72#else
73
74    #define API_ENTRY(_api) _api
75
76    #define CALL_GL_API(_api, ...)                                       \
77        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
78        _c->_api(__VA_ARGS__)
79
80    #define CALL_GL_API_RETURN(_api, ...)                                \
81        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
82        return _c->_api(__VA_ARGS__)
83
84#endif
85
86
87extern "C" {
88#include "gl2_api.in"
89#include "gl2ext_api.in"
90}
91
92#undef API_ENTRY
93#undef CALL_GL_API
94#undef CALL_GL_API_RETURN
95
96
97/*
98 * These GL calls are special because they need to EGL to retrieve some
99 * informations before they can execute.
100 */
101
102extern "C" void __glEGLImageTargetTexture2DOES(GLenum target, GLeglImageOES image);
103extern "C" void __glEGLImageTargetRenderbufferStorageOES(GLenum target, GLeglImageOES image);
104
105
106void glEGLImageTargetTexture2DOES(GLenum target, GLeglImageOES image)
107{
108    GLeglImageOES implImage =
109        (GLeglImageOES)egl_get_image_for_current_context((EGLImageKHR)image);
110    __glEGLImageTargetTexture2DOES(target, implImage);
111}
112
113void glEGLImageTargetRenderbufferStorageOES(GLenum target, GLeglImageOES image)
114{
115    GLeglImageOES implImage =
116        (GLeglImageOES)egl_get_image_for_current_context((EGLImageKHR)image);
117    __glEGLImageTargetRenderbufferStorageOES(target, implImage);
118}
119
120