1/*
2 *  Copyright (C) 2011 Igalia S.L.
3 *
4 *  This library is free software; you can redistribute it and/or
5 *  modify it under the terms of the GNU Lesser General Public
6 *  License as published by the Free Software Foundation; either
7 *  version 2.1 of the License, or (at your option) any later version.
8 *
9 *  This library is distributed in the hope that it will be useful,
10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 *  Lesser General Public License for more details.
13 *
14 *  You should have received a copy of the GNU Lesser General Public
15 *  License along with this library; if not, write to the Free Software
16 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18
19#include "config.h"
20#if ENABLE(WEBGL)
21
22#define DISABLE_SHIMS
23#include "OpenGLShims.h"
24
25#include <dlfcn.h>
26#include <wtf/text/CString.h>
27#include <wtf/text/WTFString.h>
28
29#define ASSIGN_FUNCTION_TABLE_ENTRY(FunctionName, success) \
30    openGLFunctionTable()->FunctionName = reinterpret_cast<FunctionName##Type>(lookupOpenGLFunctionAddress(#FunctionName, success))
31
32namespace WebCore {
33
34typedef void* (*glGetProcAddressType) (const char* procName);
35static void* getProcAddress(const char* procName)
36{
37    static bool initialized = false;
38    static glGetProcAddressType getProcAddressFunction = 0;
39
40    if (!initialized) {
41        getProcAddressFunction = reinterpret_cast<glGetProcAddressType>(dlsym(RTLD_DEFAULT, "glXGetProcAddress"));
42        if (!getProcAddressFunction)
43            getProcAddressFunction = reinterpret_cast<glGetProcAddressType>(dlsym(RTLD_DEFAULT, "glXGetProcAddressARB"));
44    }
45
46    if (!getProcAddressFunction)
47        return dlsym(RTLD_DEFAULT, procName);
48    return getProcAddressFunction(procName);
49}
50
51static void* lookupOpenGLFunctionAddress(const char* functionName, bool& success)
52{
53    if (!success)
54        return 0;
55
56    void* target = getProcAddress(functionName);
57    if (target)
58        return target;
59
60    String fullFunctionName(functionName);
61    fullFunctionName.append("ARB");
62    target = getProcAddress(fullFunctionName.utf8().data());
63    if (target)
64        return target;
65
66    fullFunctionName = functionName;
67    fullFunctionName.append("EXT");
68    target = getProcAddress(fullFunctionName.utf8().data());
69
70    // A null address is still a failure case.
71    if (!target)
72        success = false;
73
74    return target;
75}
76
77OpenGLFunctionTable* openGLFunctionTable()
78{
79    static OpenGLFunctionTable table;
80    return &table;
81}
82
83bool initializeOpenGLShims()
84{
85    static bool success = true;
86    static bool initialized = false;
87    if (initialized)
88        return success;
89
90    initialized = true;
91    ASSIGN_FUNCTION_TABLE_ENTRY(glActiveTexture, success);
92    ASSIGN_FUNCTION_TABLE_ENTRY(glAttachShader, success);
93    ASSIGN_FUNCTION_TABLE_ENTRY(glBindAttribLocation, success);
94    ASSIGN_FUNCTION_TABLE_ENTRY(glBindBuffer, success);
95    ASSIGN_FUNCTION_TABLE_ENTRY(glBindFramebuffer, success);
96    ASSIGN_FUNCTION_TABLE_ENTRY(glBindRenderbuffer, success);
97    ASSIGN_FUNCTION_TABLE_ENTRY(glBlendColor, success);
98    ASSIGN_FUNCTION_TABLE_ENTRY(glBlendEquation, success);
99    ASSIGN_FUNCTION_TABLE_ENTRY(glBlendEquationSeparate, success);
100    ASSIGN_FUNCTION_TABLE_ENTRY(glBlendFuncSeparate, success);
101    ASSIGN_FUNCTION_TABLE_ENTRY(glBlitFramebuffer, success);
102    ASSIGN_FUNCTION_TABLE_ENTRY(glBufferData, success);
103    ASSIGN_FUNCTION_TABLE_ENTRY(glBufferSubData, success);
104    ASSIGN_FUNCTION_TABLE_ENTRY(glCheckFramebufferStatus, success);
105    ASSIGN_FUNCTION_TABLE_ENTRY(glCompileShader, success);
106    ASSIGN_FUNCTION_TABLE_ENTRY(glCreateProgram, success);
107    ASSIGN_FUNCTION_TABLE_ENTRY(glCreateShader, success);
108    ASSIGN_FUNCTION_TABLE_ENTRY(glDeleteBuffers, success);
109    ASSIGN_FUNCTION_TABLE_ENTRY(glDeleteFramebuffers, success);
110    ASSIGN_FUNCTION_TABLE_ENTRY(glDeleteProgram, success);
111    ASSIGN_FUNCTION_TABLE_ENTRY(glDeleteRenderbuffers, success);
112    ASSIGN_FUNCTION_TABLE_ENTRY(glDeleteShader, success);
113    ASSIGN_FUNCTION_TABLE_ENTRY(glDetachShader, success);
114    ASSIGN_FUNCTION_TABLE_ENTRY(glDisableVertexAttribArray, success);
115    ASSIGN_FUNCTION_TABLE_ENTRY(glEnableVertexAttribArray, success);
116    ASSIGN_FUNCTION_TABLE_ENTRY(glFramebufferRenderbuffer, success);
117    ASSIGN_FUNCTION_TABLE_ENTRY(glFramebufferTexture2D, success);
118    ASSIGN_FUNCTION_TABLE_ENTRY(glGenBuffers, success);
119    ASSIGN_FUNCTION_TABLE_ENTRY(glGenerateMipmap, success);
120    ASSIGN_FUNCTION_TABLE_ENTRY(glGenFramebuffers, success);
121    ASSIGN_FUNCTION_TABLE_ENTRY(glGenRenderbuffers, success);
122    ASSIGN_FUNCTION_TABLE_ENTRY(glGetActiveAttrib, success);
123    ASSIGN_FUNCTION_TABLE_ENTRY(glGetActiveUniform, success);
124    ASSIGN_FUNCTION_TABLE_ENTRY(glGetAttachedShaders, success);
125    ASSIGN_FUNCTION_TABLE_ENTRY(glGetAttribLocation, success);
126    ASSIGN_FUNCTION_TABLE_ENTRY(glGetBufferParameteriv, success);
127    ASSIGN_FUNCTION_TABLE_ENTRY(glGetFramebufferAttachmentParameteriv, success);
128    ASSIGN_FUNCTION_TABLE_ENTRY(glGetProgramInfoLog, success);
129    ASSIGN_FUNCTION_TABLE_ENTRY(glGetProgramiv, success);
130    ASSIGN_FUNCTION_TABLE_ENTRY(glGetRenderbufferParameteriv, success);
131    ASSIGN_FUNCTION_TABLE_ENTRY(glGetShaderInfoLog, success);
132    ASSIGN_FUNCTION_TABLE_ENTRY(glGetShaderiv, success);
133    ASSIGN_FUNCTION_TABLE_ENTRY(glGetShaderSource, success);
134    ASSIGN_FUNCTION_TABLE_ENTRY(glGetUniformfv, success);
135    ASSIGN_FUNCTION_TABLE_ENTRY(glGetUniformiv, success);
136    ASSIGN_FUNCTION_TABLE_ENTRY(glGetUniformLocation, success);
137    ASSIGN_FUNCTION_TABLE_ENTRY(glGetVertexAttribfv, success);
138    ASSIGN_FUNCTION_TABLE_ENTRY(glGetVertexAttribiv, success);
139    ASSIGN_FUNCTION_TABLE_ENTRY(glGetVertexAttribPointerv, success);
140    ASSIGN_FUNCTION_TABLE_ENTRY(glIsBuffer, success);
141    ASSIGN_FUNCTION_TABLE_ENTRY(glIsFramebuffer, success);
142    ASSIGN_FUNCTION_TABLE_ENTRY(glIsProgram, success);
143    ASSIGN_FUNCTION_TABLE_ENTRY(glIsRenderbuffer, success);
144    ASSIGN_FUNCTION_TABLE_ENTRY(glIsShader, success);
145    ASSIGN_FUNCTION_TABLE_ENTRY(glLinkProgram, success);
146    ASSIGN_FUNCTION_TABLE_ENTRY(glRenderbufferStorage, success);
147    ASSIGN_FUNCTION_TABLE_ENTRY(glRenderbufferStorageMultisample, success);
148    ASSIGN_FUNCTION_TABLE_ENTRY(glSampleCoverage, success);
149    ASSIGN_FUNCTION_TABLE_ENTRY(glShaderSource, success);
150    ASSIGN_FUNCTION_TABLE_ENTRY(glStencilFuncSeparate, success);
151    ASSIGN_FUNCTION_TABLE_ENTRY(glStencilMaskSeparate, success);
152    ASSIGN_FUNCTION_TABLE_ENTRY(glStencilOpSeparate, success);
153    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform1f, success);
154    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform1fv, success);
155    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform1i, success);
156    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform1iv, success);
157    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform2f, success);
158    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform2fv, success);
159    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform2i, success);
160    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform2iv, success);
161    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform3f, success);
162    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform3fv, success);
163    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform3i, success);
164    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform3iv, success);
165    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform4f, success);
166    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform4fv, success);
167    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform4i, success);
168    ASSIGN_FUNCTION_TABLE_ENTRY(glUniform4iv, success);
169    ASSIGN_FUNCTION_TABLE_ENTRY(glUniformMatrix2fv, success);
170    ASSIGN_FUNCTION_TABLE_ENTRY(glUniformMatrix3fv, success);
171    ASSIGN_FUNCTION_TABLE_ENTRY(glUniformMatrix4fv, success);
172    ASSIGN_FUNCTION_TABLE_ENTRY(glUseProgram, success);
173    ASSIGN_FUNCTION_TABLE_ENTRY(glValidateProgram, success);
174    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib1f, success);
175    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib1fv, success);
176    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib2f, success);
177    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib2fv, success);
178    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib3f, success);
179    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib3fv, success);
180    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib4f, success);
181    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttrib4fv, success);
182    ASSIGN_FUNCTION_TABLE_ENTRY(glVertexAttribPointer, success);
183
184    if (!success)
185        LOG_ERROR("Could not initialize OpenGL shims");
186    return success;
187}
188
189} // namespace WebCore
190
191#endif // ENABLE(WEBGL)
192