gl2.cpp revision f12fe43e8c280923fde743f22cea238e48c929f1 
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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
30#include <utils/Trace.h>
31
32#include <utils/CallStack.h>
33
34#include "hooks.h"
35#include "egl_impl.h"
36
37using namespace android;
38
39// ----------------------------------------------------------------------------
40// Actual GL entry-points
41// ----------------------------------------------------------------------------
42
43#undef API_ENTRY
44#undef CALL_GL_API
45#undef CALL_GL_API_RETURN
46
47#define DEBUG_CALL_GL_API 0
48#define DEBUG_PRINT_CALL_STACK_ON_ERROR 0
49#define SYSTRACE_CALL_GL_API 0
50
51#if USE_FAST_TLS_KEY___
52
53    #ifdef HAVE_ARM_TLS_REGISTER
54        #define GET_TLS(reg) \
55            "mrc p15, 0, " #reg ", c13, c0, 3 \n"
56    #else
57        #define GET_TLS(reg) \
58            "mov   " #reg ", #0xFFFF0FFF      \n"  \
59            "ldr   " #reg ", [" #reg ", #-15] \n"
60    #endif
61
62    #define API_ENTRY(_api) __attribute__((naked)) _api
63
64    #define CALL_GL_API(_api, ...)                              \
65         asm volatile(                                          \
66            GET_TLS(r12)                                        \
67            "ldr   r12, [r12, %[tls]] \n"                       \
68            "cmp   r12, #0            \n"                       \
69            "ldrne pc,  [r12, %[api]] \n"                       \
70            "mov   r0, #0             \n"                       \
71            "bx    lr                 \n"                       \
72            :                                                   \
73            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
74              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
75            :                                                   \
76            );
77
78    #define CALL_GL_API_RETURN(_api, ...) \
79        CALL_GL_API(_api, __VA_ARGS__) \
80        return 0; // placate gcc's warnings. never reached.
81
82#else
83
84    #define API_ENTRY(_api) _api
85
86#if DEBUG_CALL_GL_API
87
88    #define CALL_GL_API(_api, ...)                                       \
89        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
90        _c->_api(__VA_ARGS__); \
91        GLenum status = GL_NO_ERROR; \
92        bool error = false; \
93        while ((status = glGetError()) != GL_NO_ERROR) { \
94            ALOGD("[" #_api "] 0x%x", status); \
95            error = true; \
96        } \
97        if (DEBUG_PRINT_CALL_STACK_ON_ERROR && error) { \
98            CallStack s; \
99            s.update(); \
100            s.dump("glGetError:" #_api); \
101        }
102
103#elif SYSTRACE_CALL_GL_API
104
105    #define CALL_GL_API(_api, ...)                                       \
106        ATRACE_CALL();                                                   \
107        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
108        _c->_api(__VA_ARGS__);
109
110#else
111
112    #define CALL_GL_API(_api, ...)                                       \
113        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
114        _c->_api(__VA_ARGS__);
115
116#endif
117
118    #define CALL_GL_API_RETURN(_api, ...)                                \
119        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl;  \
120        return _c->_api(__VA_ARGS__)
121
122#endif
123
124
125extern "C" {
126#include "gl2_api.in"
127#include "gl2ext_api.in"
128}
129
130#undef API_ENTRY
131#undef CALL_GL_API
132#undef CALL_GL_API_RETURN
133
134/*
135 * glGetString() is special because we expose some extensions in the wrapper
136 */
137
138extern "C" const GLubyte * __glGetString(GLenum name);
139
140const GLubyte * glGetString(GLenum name)
141{
142    const GLubyte * ret = egl_get_string_for_current_context(name);
143    if (ret == NULL) {
144        ret = __glGetString(name);
145    }
146    return ret;
147}
148