gl2.cpp revision 39c24a20bbc697630d2b92c251b70c04d6f9d00c 
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 <GLES3/gl3.h>
24#include <GLES3/gl3ext.h>
25#include <GLES2/gl2ext.h>
26
27#include <cutils/log.h>
28#include <cutils/properties.h>
29
30#include "../hooks.h"
31#include "../egl_impl.h"
32
33using namespace android;
34
35// ----------------------------------------------------------------------------
36// Actual GL entry-points
37// ----------------------------------------------------------------------------
38
39#undef API_ENTRY
40#undef CALL_GL_API
41#undef CALL_GL_API_RETURN
42
43#if USE_FAST_TLS_KEY
44
45  #if defined(__arm__)
46
47    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
48
49    #define API_ENTRY(_api) __attribute__((naked)) _api
50
51    #define CALL_GL_API(_api, ...)                              \
52         asm volatile(                                          \
53            GET_TLS(r12)                                        \
54            "ldr   r12, [r12, %[tls]] \n"                       \
55            "cmp   r12, #0            \n"                       \
56            "ldrne pc,  [r12, %[api]] \n"                       \
57            "mov   r0, #0             \n"                       \
58            "bx    lr                 \n"                       \
59            :                                                   \
60            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
61              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
62            :                                                   \
63            );
64
65  #elif defined(__mips__)
66
67    #define API_ENTRY(_api) __attribute__((noinline)) _api
68
69    #define CALL_GL_API(_api, ...)                               \
70        register unsigned int _t0 asm("t0");                     \
71        register unsigned int _fn asm("t1");                     \
72        register unsigned int _tls asm("v1");                    \
73        register unsigned int _v0 asm("v0");                     \
74        asm volatile(                                            \
75            ".set  push\n\t"                                     \
76            ".set  noreorder\n\t"                                \
77            ".set mips32r2\n\t"                                  \
78            "rdhwr %[tls], $29\n\t"                              \
79            "lw    %[t0], %[OPENGL_API](%[tls])\n\t"             \
80            "beqz  %[t0], 1f\n\t"                                \
81            " move %[fn],$ra\n\t"                                \
82            "lw    %[fn], %[API](%[t0])\n\t"                     \
83            "movz  %[fn], $ra, %[fn]\n\t"                        \
84            "1:\n\t"                                             \
85            "j     %[fn]\n\t"                                    \
86            " move %[v0], $0\n\t"                                \
87            ".set  pop\n\t"                                      \
88            : [fn] "=c"(_fn),                                    \
89              [tls] "=&r"(_tls),                                 \
90              [t0] "=&r"(_t0),                                   \
91              [v0] "=&r"(_v0)                                    \
92            : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),           \
93              [API] "I"(__builtin_offsetof(gl_hooks_t, gl._api)) \
94            :                                                    \
95            );
96
97  #else
98
99    #error Unsupported architecture
100
101  #endif
102
103    #define CALL_GL_API_RETURN(_api, ...) \
104        CALL_GL_API(_api, __VA_ARGS__) \
105        return 0; // placate gcc's warnings. never reached.
106
107#else
108
109    #define API_ENTRY(_api) _api
110
111    #define CALL_GL_API(_api, ...)                                       \
112        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
113        _c->_api(__VA_ARGS__);
114
115    #define CALL_GL_API_RETURN(_api, ...)                                \
116        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
117        return _c->_api(__VA_ARGS__)
118
119#endif
120
121
122extern "C" {
123#include "gl3_api.in"
124#include "gl2ext_api.in"
125#include "gl3ext_api.in"
126}
127
128#undef API_ENTRY
129#undef CALL_GL_API
130#undef CALL_GL_API_RETURN
131
132/*
133 * glGetString() is special because we expose some extensions in the wrapper
134 */
135
136extern "C" const GLubyte * __glGetString(GLenum name);
137
138const GLubyte * glGetString(GLenum name)
139{
140    const GLubyte * ret = egl_get_string_for_current_context(name);
141    if (ret == NULL) {
142        ret = __glGetString(name);
143    }
144    return ret;
145}
146