gl2.cpp revision c2774f9b7341980c626c52a70e4fdf64d1b426e8 
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 <cutils/log.h>
24#include <cutils/properties.h>
25
26#include "../hooks.h"
27#include "../egl_impl.h"
28
29using namespace android;
30
31// ----------------------------------------------------------------------------
32// Actual GL entry-points
33// ----------------------------------------------------------------------------
34
35#undef API_ENTRY
36#undef CALL_GL_API
37#undef CALL_GL_API_RETURN
38
39#if defined(__arm__) && !USE_SLOW_BINDING
40
41    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
42
43    #define API_ENTRY(_api) __attribute__((noinline)) _api
44
45    #define CALL_GL_API(_api, ...)                              \
46         asm volatile(                                          \
47            GET_TLS(r12)                                        \
48            "ldr   r12, [r12, %[tls]] \n"                       \
49            "cmp   r12, #0            \n"                       \
50            "ldrne pc,  [r12, %[api]] \n"                       \
51            :                                                   \
52            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
53              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
54            :                                                   \
55            );
56
57#elif defined(__i386__) && !USE_SLOW_BINDING
58
59    #define API_ENTRY(_api) __attribute__((noinline)) _api
60
61    #define CALL_GL_API(_api, ...)                                  \
62        register void** fn;                                         \
63        __asm__ volatile(                                           \
64            "mov %%gs:0, %[fn]\n"                                   \
65            "mov %P[tls](%[fn]), %[fn]\n"                           \
66            "test %[fn], %[fn]\n"                                   \
67            "je 1f\n"                                               \
68            "jmp *%P[api](%[fn])\n"                                 \
69            "1:\n"                                                  \
70            : [fn] "=r" (fn)                                        \
71            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),        \
72              [api] "i" (__builtin_offsetof(gl_hooks_t, gl._api))   \
73            : "cc"                                                  \
74            );
75
76#elif defined(__x86_64__) && !USE_SLOW_BINDING
77
78    #define API_ENTRY(_api) __attribute__((noinline)) _api
79
80    #define CALL_GL_API(_api, ...)                                  \
81         register void** fn;                                        \
82         __asm__ volatile(                                          \
83            "mov %%fs:0, %[fn]\n"                                   \
84            "mov %P[tls](%[fn]), %[fn]\n"                           \
85            "test %[fn], %[fn]\n"                                   \
86            "je 1f\n"                                               \
87            "jmp *%P[api](%[fn])\n"                                 \
88            "1:\n"                                                  \
89            : [fn] "=r" (fn)                                        \
90            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),        \
91              [api] "i" (__builtin_offsetof(gl_hooks_t, gl._api))   \
92            : "cc"                                                  \
93            );
94
95#elif defined(__mips__) && !USE_SLOW_BINDING
96
97    #define API_ENTRY(_api) __attribute__((noinline)) _api
98
99    #define CALL_GL_API(_api, ...)                               \
100        register unsigned int _t0 asm("t0");                     \
101        register unsigned int _fn asm("t1");                     \
102        register unsigned int _tls asm("v1");                    \
103        register unsigned int _v0 asm("v0");                     \
104        asm volatile(                                            \
105            ".set  push\n\t"                                     \
106            ".set  noreorder\n\t"                                \
107            ".set mips32r2\n\t"                                  \
108            "rdhwr %[tls], $29\n\t"                              \
109            "lw    %[t0], %[OPENGL_API](%[tls])\n\t"             \
110            "beqz  %[t0], 1f\n\t"                                \
111            " move %[fn],$ra\n\t"                                \
112            "lw    %[fn], %[API](%[t0])\n\t"                     \
113            "movz  %[fn], $ra, %[fn]\n\t"                        \
114            "1:\n\t"                                             \
115            "j     %[fn]\n\t"                                    \
116            " move %[v0], $0\n\t"                                \
117            ".set  pop\n\t"                                      \
118            : [fn] "=c"(_fn),                                    \
119              [tls] "=&r"(_tls),                                 \
120              [t0] "=&r"(_t0),                                   \
121              [v0] "=&r"(_v0)                                    \
122            : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),           \
123              [API] "I"(__builtin_offsetof(gl_hooks_t, gl._api)) \
124            :                                                    \
125            );
126
127#else
128
129    #define API_ENTRY(_api) _api
130
131    #define CALL_GL_API(_api, ...)                                       \
132        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
133        if (_c) return _c->_api(__VA_ARGS__);
134
135#endif
136
137#define CALL_GL_API_RETURN(_api, ...) \
138    CALL_GL_API(_api, __VA_ARGS__) \
139    return 0;
140
141
142
143extern "C" {
144#pragma GCC diagnostic ignored "-Wunused-parameter"
145#include "gl2_api.in"
146#include "gl2ext_api.in"
147#pragma GCC diagnostic warning "-Wunused-parameter"
148}
149
150#undef API_ENTRY
151#undef CALL_GL_API
152#undef CALL_GL_API_RETURN
153
154/*
155 * glGetString() is special because we expose some extensions in the wrapper
156 */
157
158extern "C" const GLubyte * __glGetString(GLenum name);
159
160const GLubyte * glGetString(GLenum name)
161{
162    const GLubyte * ret = egl_get_string_for_current_context(name);
163    if (ret == NULL) {
164        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;
165        ret = _c->glGetString(name);
166    }
167    return ret;
168}
169