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
32 using 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 "mov r0, #0 \n" \
62 "bx lr \n" \
63 : \
64 : [tls] "J"(TLS_SLOT_OPENGL_API*4), \
65 [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api)) \
66 : \
67 );
68
69 #define CALL_GL_API_RETURN(_api, ...) \
70 CALL_GL_API(_api, __VA_ARGS__) \
71 return 0; // placate gcc's warnings. never reached.
72
73 #else
74
75 #define API_ENTRY(_api) _api
76
77 #define CALL_GL_API(_api, ...) \
78 gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl; \
79 _c->_api(__VA_ARGS__);
80
81 #define CALL_GL_API_RETURN(_api, ...) \
82 gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl; \
83 return _c->_api(__VA_ARGS__)
84
85 #endif
86
87
88 extern "C" {
89 #include "gl2_api.in"
90 #include "gl2ext_api.in"
91 }
92
93 #undef API_ENTRY
94 #undef CALL_GL_API
95 #undef CALL_GL_API_RETURN
96
97 /*
98 * glGetString() is special because we expose some extensions in the wrapper
99 */
100
101 extern "C" const GLubyte * __glGetString(GLenum name);
102
glGetString(GLenum name)103 const GLubyte * glGetString(GLenum name)
104 {
105 const GLubyte * ret = egl_get_string_for_current_context(name);
106 if (ret == NULL) {
107 ret = __glGetString(name);
108 }
109 return ret;
110 }
111