Extensions.cpp revision b47ea9b2ed24f8eb6fc8b338555ff0d8825d8565 
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    mHasUnpackSubImage = hasGlExtension("GL_EXT_unpack_subimage");
62
63    // Query EGL extensions
64    findExtensions(eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS), mEglExtensionList);
65
66    char property[PROPERTY_VALUE_MAX];
67    if (property_get(PROPERTY_DEBUG_NV_PROFILING, property, nullptr) > 0) {
68        mHasNvSystemTime = !strcmp(property, "true") && hasEglExtension("EGL_NV_system_time");
69    } else {
70        mHasNvSystemTime = false;
71    }
72
73    const char* version = (const char*) glGetString(GL_VERSION);
74
75    // Section 6.1.5 of the OpenGL ES specification indicates the GL version
76    // string strictly follows this format:
77    //
78    // OpenGL<space>ES<space><version number><space><vendor-specific information>
79    //
80    // In addition section 6.1.5 describes the version number thusly:
81    //
82    // "The version number is either of the form major number.minor number or
83    // major number.minor number.release number, where the numbers all have one
84    // or more digits. The release number and vendor specific information are
85    // optional."
86
87    if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
88        // If we cannot parse the version number, assume OpenGL ES 2.0
89        mVersionMajor = 2;
90        mVersionMinor = 0;
91    }
92}
93
94///////////////////////////////////////////////////////////////////////////////
95// Methods
96///////////////////////////////////////////////////////////////////////////////
97
98bool Extensions::hasGlExtension(const char* extension) const {
99   const String8 s(extension);
100   return mGlExtensionList.indexOf(s) >= 0;
101}
102
103bool Extensions::hasEglExtension(const char* extension) const {
104   const String8 s(extension);
105   return mEglExtensionList.indexOf(s) >= 0;
106}
107
108void Extensions::findExtensions(const char* extensions, SortedVector<String8>& list) const {
109    const char* current = extensions;
110    const char* head = current;
111    EXT_LOGD("Available extensions:");
112    do {
113        head = strchr(current, ' ');
114        String8 s(current, head ? head - current : strlen(current));
115        if (s.length()) {
116            list.add(s);
117            EXT_LOGD("  %s", s.string());
118        }
119        current = head + 1;
120    } while (head);
121}
122
123void Extensions::dump() const {
124   ALOGD("%s", (const char*) glGetString(GL_VERSION));
125   ALOGD("Supported GL extensions:\n%s", (const char*) glGetString(GL_EXTENSIONS));
126   ALOGD("Supported EGL extensions:\n%s", eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS));
127}
128
129}; // namespace uirenderer
130}; // namespace android
131