gl2.cpp revision bbbddb83bbd3ca2032294b55c91b1023acc927ac 
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 defined(__arm__) && !USE_SLOW_BINDING
44
45    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
46
47    #define API_ENTRY(_api) __attribute__((noinline)) _api
48
49    #define CALL_GL_API(_api, ...)                              \
50         asm volatile(                                          \
51            GET_TLS(r12)                                        \
52            "ldr   r12, [r12, %[tls]] \n"                       \
53            "cmp   r12, #0            \n"                       \
54            "ldrne pc,  [r12, %[api]] \n"                       \
55            :                                                   \
56            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
57              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
58            :                                                   \
59            );
60
61#elif defined(__mips__) && !USE_SLOW_BINDING
62
63    #define API_ENTRY(_api) __attribute__((noinline)) _api
64
65    #define CALL_GL_API(_api, ...)                               \
66        register unsigned int _t0 asm("t0");                     \
67        register unsigned int _fn asm("t1");                     \
68        register unsigned int _tls asm("v1");                    \
69        register unsigned int _v0 asm("v0");                     \
70        asm volatile(                                            \
71            ".set  push\n\t"                                     \
72            ".set  noreorder\n\t"                                \
73            ".set mips32r2\n\t"                                  \
74            "rdhwr %[tls], $29\n\t"                              \
75            "lw    %[t0], %[OPENGL_API](%[tls])\n\t"             \
76            "beqz  %[t0], 1f\n\t"                                \
77            " move %[fn],$ra\n\t"                                \
78            "lw    %[fn], %[API](%[t0])\n\t"                     \
79            "movz  %[fn], $ra, %[fn]\n\t"                        \
80            "1:\n\t"                                             \
81            "j     %[fn]\n\t"                                    \
82            " move %[v0], $0\n\t"                                \
83            ".set  pop\n\t"                                      \
84            : [fn] "=c"(_fn),                                    \
85              [tls] "=&r"(_tls),                                 \
86              [t0] "=&r"(_t0),                                   \
87              [v0] "=&r"(_v0)                                    \
88            : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),           \
89              [API] "I"(__builtin_offsetof(gl_hooks_t, gl._api)) \
90            :                                                    \
91            );
92
93#else
94
95    #define API_ENTRY(_api) _api
96
97    #define CALL_GL_API(_api, ...)                                       \
98        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
99        if (_c) return _c->_api(__VA_ARGS__);
100
101#endif
102
103#define CALL_GL_API_RETURN(_api, ...) \
104    CALL_GL_API(_api, __VA_ARGS__) \
105    return 0;
106
107
108
109extern "C" {
110#pragma GCC diagnostic ignored "-Wunused-parameter"
111#include "gl2_api.in"
112#include "gl2ext_api.in"
113#pragma GCC diagnostic warning "-Wunused-parameter"
114}
115
116#undef API_ENTRY
117#undef CALL_GL_API
118#undef CALL_GL_API_RETURN
119
120/*
121 * glGetString() is special because we expose some extensions in the wrapper
122 */
123
124extern "C" const GLubyte * __glGetString(GLenum name);
125
126const GLubyte * glGetString(GLenum name)
127{
128    const GLubyte * ret = egl_get_string_for_current_context(name);
129    if (ret == NULL) {
130        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;
131        ret = _c->glGetString(name);
132    }
133    return ret;
134}
135