Extensions.cpp revision 041b985dbb2f75aa492236d46ab47dbda8c2c74e 
1/*
2 * Copyright (C) 2013 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#define LOG_TAG "OpenGLRenderer"
18
19#include "Extensions.h"
20
21#include "Debug.h"
22#include "Properties.h"
23
24#include <EGL/egl.h>
25#include <EGL/eglext.h>
26#include <GLES2/gl2ext.h>
27#include <utils/Log.h>
28
29namespace android {
30
31using namespace uirenderer;
32ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
33
34namespace uirenderer {
35
36///////////////////////////////////////////////////////////////////////////////
37// Defines
38///////////////////////////////////////////////////////////////////////////////
39
40// Debug
41#if DEBUG_EXTENSIONS
42    #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
43#else
44    #define EXT_LOGD(...)
45#endif
46
47///////////////////////////////////////////////////////////////////////////////
48// Constructors
49///////////////////////////////////////////////////////////////////////////////
50
51Extensions::Extensions() {
52    // Query GL extensions
53    findExtensions((const char*) glGetString(GL_EXTENSIONS), mGlExtensionList);
54    mHasNPot = hasGlExtension("GL_OES_texture_npot");
55    mHasFramebufferFetch = hasGlExtension("GL_NV_shader_framebuffer_fetch");
56    mHasDiscardFramebuffer = hasGlExtension("GL_EXT_discard_framebuffer");
57    mHasDebugMarker = hasGlExtension("GL_EXT_debug_marker");
58    mHasTiledRendering = hasGlExtension("GL_QCOM_tiled_rendering");
59    mHas1BitStencil = hasGlExtension("GL_OES_stencil1");
60    mHas4BitStencil = hasGlExtension("GL_OES_stencil4");
61
62    // Query EGL extensions
63    findExtensions(eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS), mEglExtensionList);
64
65    char property[PROPERTY_VALUE_MAX];
66    if (property_get(PROPERTY_DEBUG_NV_PROFILING, property, nullptr) > 0) {
67        mHasNvSystemTime = !strcmp(property, "true") && hasEglExtension("EGL_NV_system_time");
68    } else {
69        mHasNvSystemTime = false;
70    }
71
72    const char* version = (const char*) glGetString(GL_VERSION);
73
74    // Section 6.1.5 of the OpenGL ES specification indicates the GL version
75    // string strictly follows this format:
76    //
77    // OpenGL<space>ES<space><version number><space><vendor-specific information>
78    //
79    // In addition section 6.1.5 describes the version number thusly:
80    //
81    // "The version number is either of the form major number.minor number or
82    // major number.minor number.release number, where the numbers all have one
83    // or more digits. The release number and vendor specific information are
84    // optional."
85
86    if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
87        // If we cannot parse the version number, assume OpenGL ES 2.0
88        mVersionMajor = 2;
89        mVersionMinor = 0;
90    }
91}
92
93///////////////////////////////////////////////////////////////////////////////
94// Methods
95///////////////////////////////////////////////////////////////////////////////
96
97bool Extensions::hasGlExtension(const char* extension) const {
98   const String8 s(extension);
99   return mGlExtensionList.indexOf(s) >= 0;
100}
101
102bool Extensions::hasEglExtension(const char* extension) const {
103   const String8 s(extension);
104   return mEglExtensionList.indexOf(s) >= 0;
105}
106
107void Extensions::findExtensions(const char* extensions, SortedVector<String8>& list) const {
108    const char* current = extensions;
109    const char* head = current;
110    EXT_LOGD("Available extensions:");
111    do {
112        head = strchr(current, ' ');
113        String8 s(current, head ? head - current : strlen(current));
114        if (s.length()) {
115            list.add(s);
116            EXT_LOGD("  %s", s.string());
117        }
118        current = head + 1;
119    } while (head);
120}
121
122void Extensions::dump() const {
123   ALOGD("%s", (const char*) glGetString(GL_VERSION));
124   ALOGD("Supported GL extensions:\n%s", (const char*) glGetString(GL_EXTENSIONS));
125   ALOGD("Supported EGL extensions:\n%s", eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS));
126}
127
128}; // namespace uirenderer
129}; // namespace android
130