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 <GLES/gl.h>
24#include <GLES/glext.h>
25
26#include <cutils/log.h>
27#include <cutils/properties.h>
28
29#include "hooks.h"
30#include "egl_impl.h"
31
32using namespace android;
33
34// set this to 1 for crude GL debugging
35#define CHECK_FOR_GL_ERRORS     0
36
37// ----------------------------------------------------------------------------
38// extensions for the framework
39// ----------------------------------------------------------------------------
40
41extern "C" {
42GL_API void GL_APIENTRY glColorPointerBounds(GLint size, GLenum type, GLsizei stride,
43        const GLvoid *ptr, GLsizei count);
44GL_API void GL_APIENTRY glNormalPointerBounds(GLenum type, GLsizei stride,
45        const GLvoid *pointer, GLsizei count);
46GL_API void GL_APIENTRY glTexCoordPointerBounds(GLint size, GLenum type,
47        GLsizei stride, const GLvoid *pointer, GLsizei count);
48GL_API void GL_APIENTRY glVertexPointerBounds(GLint size, GLenum type,
49        GLsizei stride, const GLvoid *pointer, GLsizei count);
50GL_API void GL_APIENTRY glPointSizePointerOESBounds(GLenum type,
51        GLsizei stride, const GLvoid *pointer, GLsizei count);
52GL_API void GL_APIENTRY glMatrixIndexPointerOESBounds(GLint size, GLenum type,
53        GLsizei stride, const GLvoid *pointer, GLsizei count);
54GL_API void GL_APIENTRY glWeightPointerOESBounds(GLint size, GLenum type,
55        GLsizei stride, const GLvoid *pointer, GLsizei count);
56}
57
58void glColorPointerBounds(GLint size, GLenum type, GLsizei stride,
59        const GLvoid *ptr, GLsizei count) {
60    glColorPointer(size, type, stride, ptr);
61}
62void glNormalPointerBounds(GLenum type, GLsizei stride,
63        const GLvoid *pointer, GLsizei count) {
64    glNormalPointer(type, stride, pointer);
65}
66void glTexCoordPointerBounds(GLint size, GLenum type,
67        GLsizei stride, const GLvoid *pointer, GLsizei count) {
68    glTexCoordPointer(size, type, stride, pointer);
69}
70void glVertexPointerBounds(GLint size, GLenum type,
71        GLsizei stride, const GLvoid *pointer, GLsizei count) {
72    glVertexPointer(size, type, stride, pointer);
73}
74
75void GL_APIENTRY glPointSizePointerOESBounds(GLenum type,
76        GLsizei stride, const GLvoid *pointer, GLsizei count) {
77    glPointSizePointerOES(type, stride, pointer);
78}
79
80GL_API void GL_APIENTRY glMatrixIndexPointerOESBounds(GLint size, GLenum type,
81        GLsizei stride, const GLvoid *pointer, GLsizei count) {
82    glMatrixIndexPointerOES(size, type, stride, pointer);
83}
84
85GL_API void GL_APIENTRY glWeightPointerOESBounds(GLint size, GLenum type,
86        GLsizei stride, const GLvoid *pointer, GLsizei count) {
87    glWeightPointerOES(size, type, stride, pointer);
88}
89
90// ----------------------------------------------------------------------------
91// Actual GL entry-points
92// ----------------------------------------------------------------------------
93
94#undef API_ENTRY
95#undef CALL_GL_API
96#undef CALL_GL_API_RETURN
97
98#if USE_FAST_TLS_KEY && !CHECK_FOR_GL_ERRORS
99
100    #ifdef HAVE_ARM_TLS_REGISTER
101        #define GET_TLS(reg) \
102            "mrc p15, 0, " #reg ", c13, c0, 3 \n"
103    #else
104        #define GET_TLS(reg) \
105            "mov   " #reg ", #0xFFFF0FFF      \n"  \
106            "ldr   " #reg ", [" #reg ", #-15] \n"
107    #endif
108
109    #define API_ENTRY(_api) __attribute__((naked)) _api
110
111    #define CALL_GL_API(_api, ...)                              \
112         asm volatile(                                          \
113            GET_TLS(r12)                                        \
114            "ldr   r12, [r12, %[tls]] \n"                       \
115            "cmp   r12, #0            \n"                       \
116            "ldrne pc,  [r12, %[api]] \n"                       \
117            "mov   r0, #0             \n"                       \
118            "bx    lr                 \n"                       \
119            :                                                   \
120            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
121              [api] "J"(__builtin_offsetof(gl_hooks_t, gl._api))    \
122            :                                                   \
123            );
124
125    #define CALL_GL_API_RETURN(_api, ...) \
126        CALL_GL_API(_api, __VA_ARGS__) \
127        return 0; // placate gcc's warnings. never reached.
128
129#else
130
131    #if CHECK_FOR_GL_ERRORS
132
133        #define CHECK_GL_ERRORS(_api) \
134            do { GLint err = glGetError(); \
135                ALOGE_IF(err != GL_NO_ERROR, "%s failed (0x%04X)", #_api, err); \
136            } while(false);
137
138    #else
139
140        #define CHECK_GL_ERRORS(_api) do { } while(false);
141
142    #endif
143
144
145    #define API_ENTRY(_api) _api
146
147    #define CALL_GL_API(_api, ...)                                      \
148        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl; \
149        _c->_api(__VA_ARGS__);                                          \
150        CHECK_GL_ERRORS(_api)
151
152    #define CALL_GL_API_RETURN(_api, ...)                               \
153        gl_hooks_t::gl_t const * const _c = &getGlThreadSpecific()->gl; \
154        return _c->_api(__VA_ARGS__)
155
156#endif
157
158
159extern "C" {
160#include "gl_api.in"
161#include "glext_api.in"
162}
163
164#undef API_ENTRY
165#undef CALL_GL_API
166#undef CALL_GL_API_RETURN
167
168/*
169 * glGetString() is special because we expose some extensions in the wrapper
170 */
171
172extern "C" const GLubyte * __glGetString(GLenum name);
173
174const GLubyte * glGetString(GLenum name)
175{
176    const GLubyte * ret = egl_get_string_for_current_context(name);
177    if (ret == NULL) {
178        ret = __glGetString(name);
179    }
180    return ret;
181}
182