Extensions.cpp revision 5a4690bf26932c0d6940e4af8516d920e09ae81a 
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#include "Extensions.h"
18
19#include "Debug.h"
20#include "Properties.h"
21
22#include <EGL/egl.h>
23#include <EGL/eglext.h>
24#include <GLES2/gl2ext.h>
25#include <utils/Log.h>
26
27namespace android {
28
29using namespace uirenderer;
30ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
31
32namespace uirenderer {
33
34///////////////////////////////////////////////////////////////////////////////
35// Defines
36///////////////////////////////////////////////////////////////////////////////
37
38// Debug
39#if DEBUG_EXTENSIONS
40    #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
41#else
42    #define EXT_LOGD(...)
43#endif
44
45///////////////////////////////////////////////////////////////////////////////
46// Constructors
47///////////////////////////////////////////////////////////////////////////////
48
49Extensions::Extensions() {
50    // Query GL extensions
51    findExtensions((const char*) glGetString(GL_EXTENSIONS), mGlExtensionList);
52    mHasNPot = hasGlExtension("GL_OES_texture_npot");
53    mHasFramebufferFetch = hasGlExtension("GL_NV_shader_framebuffer_fetch");
54    mHasDiscardFramebuffer = hasGlExtension("GL_EXT_discard_framebuffer");
55    mHasDebugMarker = hasGlExtension("GL_EXT_debug_marker");
56    mHasTiledRendering = hasGlExtension("GL_QCOM_tiled_rendering");
57    mHas1BitStencil = hasGlExtension("GL_OES_stencil1");
58    mHas4BitStencil = hasGlExtension("GL_OES_stencil4");
59
60    // Query EGL extensions
61    findExtensions(eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS), mEglExtensionList);
62
63    char property[PROPERTY_VALUE_MAX];
64    if (property_get(PROPERTY_DEBUG_NV_PROFILING, property, nullptr) > 0) {
65        mHasNvSystemTime = !strcmp(property, "true") && hasEglExtension("EGL_NV_system_time");
66    } else {
67        mHasNvSystemTime = false;
68    }
69
70    const char* version = (const char*) glGetString(GL_VERSION);
71
72    // Section 6.1.5 of the OpenGL ES specification indicates the GL version
73    // string strictly follows this format:
74    //
75    // OpenGL<space>ES<space><version number><space><vendor-specific information>
76    //
77    // In addition section 6.1.5 describes the version number thusly:
78    //
79    // "The version number is either of the form major number.minor number or
80    // major number.minor number.release number, where the numbers all have one
81    // or more digits. The release number and vendor specific information are
82    // optional."
83
84    if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
85        // If we cannot parse the version number, assume OpenGL ES 2.0
86        mVersionMajor = 2;
87        mVersionMinor = 0;
88    }
89}
90
91///////////////////////////////////////////////////////////////////////////////
92// Methods
93///////////////////////////////////////////////////////////////////////////////
94
95bool Extensions::hasGlExtension(const char* extension) const {
96   const String8 s(extension);
97   return mGlExtensionList.indexOf(s) >= 0;
98}
99
100bool Extensions::hasEglExtension(const char* extension) const {
101   const String8 s(extension);
102   return mEglExtensionList.indexOf(s) >= 0;
103}
104
105void Extensions::findExtensions(const char* extensions, SortedVector<String8>& list) const {
106    const char* current = extensions;
107    const char* head = current;
108    EXT_LOGD("Available extensions:");
109    do {
110        head = strchr(current, ' ');
111        String8 s(current, head ? head - current : strlen(current));
112        if (s.length()) {
113            list.add(s);
114            EXT_LOGD("  %s", s.string());
115        }
116        current = head + 1;
117    } while (head);
118}
119
120void Extensions::dump() const {
121   ALOGD("%s", (const char*) glGetString(GL_VERSION));
122   ALOGD("Supported GL extensions:\n%s", (const char*) glGetString(GL_EXTENSIONS));
123   ALOGD("Supported EGL extensions:\n%s", eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS));
124}
125
126}; // namespace uirenderer
127}; // namespace android
128