gl2.cpp revision b1a39d67be99fe6c4545b25e10ac82a5dd1df634 
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    #define API_ENTRY(_api) __attribute__((naked)) _api
45
46    #define CALL_GL_API(_api, ...)                              \
47         asm volatile(                                          \
48            "mov   r12, #0xFFFF0FFF   \n"                       \
49            "ldr   r12, [r12, #-15]   \n"                       \
50            "ldr   r12, [r12, %[tls]] \n"                       \
51            "cmp   r12, #0            \n"                       \
52            "ldrne pc,  [r12, %[api]] \n"                       \
53            "bx    lr                 \n"                       \
54            :                                                   \
55            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
56              [api] "J"(__builtin_offsetof(gl_hooks_t, gl2._api))    \
57            :                                                   \
58            );
59
60    #define CALL_GL_API_RETURN(_api, ...) \
61        CALL_GL_API(_api, __VA_ARGS__) \
62        return 0; // placate gcc's warnings. never reached.
63
64#else
65
66    #define API_ENTRY(_api) _api
67
68    #define CALL_GL_API(_api, ...)                                       \
69        gl_hooks_t::gl2_t const * const _c = &getGlThreadSpecific()->gl2; \
70        _c->_api(__VA_ARGS__)
71
72    #define CALL_GL_API_RETURN(_api, ...)                                \
73        gl_hooks_t::gl2_t const * const _c = &getGlThreadSpecific()->gl2; \
74        return _c->_api(__VA_ARGS__)
75
76#endif
77
78
79extern "C" {
80#include "gl2_api.in"
81#include "gl2ext_api.in"
82}
83
84#undef API_ENTRY
85#undef CALL_GL_API
86#undef CALL_GL_API_RETURN
87
88
89/*
90 * These GL calls are special because they need to EGL to retrieve some
91 * informations before they can execute.
92 */
93
94extern "C" void __glEGLImageTargetTexture2DOES(GLenum target, GLeglImageOES image);
95extern "C" void __glEGLImageTargetRenderbufferStorageOES(GLenum target, GLeglImageOES image);
96
97
98void glEGLImageTargetTexture2DOES(GLenum target, GLeglImageOES image)
99{
100    GLeglImageOES implImage =
101        (GLeglImageOES)egl_get_image_for_current_context((EGLImageKHR)image);
102    __glEGLImageTargetTexture2DOES(target, implImage);
103}
104
105void glEGLImageTargetRenderbufferStorageOES(GLenum target, GLeglImageOES image)
106{
107    GLeglImageOES implImage =
108        (GLeglImageOES)egl_get_image_for_current_context((EGLImageKHR)image);
109    __glEGLImageTargetRenderbufferStorageOES(target, image);
110}
111
112