Extensions.cpp revision d538d30e2f498de12a46e2aa3b0814c8d9526226 
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 <GLES2/gl2.h>
20#include <GLES2/gl2ext.h>
21
22#include <EGL/egl.h>
23#include <EGL/eglext.h>
24
25#include <utils/Log.h>
26
27#include "Debug.h"
28#include "Extensions.h"
29#include "Properties.h"
30
31namespace android {
32
33using namespace uirenderer;
34ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
35
36namespace uirenderer {
37
38///////////////////////////////////////////////////////////////////////////////
39// Defines
40///////////////////////////////////////////////////////////////////////////////
41
42// Debug
43#if DEBUG_EXTENSIONS
44    #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
45#else
46    #define EXT_LOGD(...)
47#endif
48
49///////////////////////////////////////////////////////////////////////////////
50// Constructors
51///////////////////////////////////////////////////////////////////////////////
52
53Extensions::Extensions(): Singleton<Extensions>() {
54    // Query GL extensions
55    findExtensions((const char*) glGetString(GL_EXTENSIONS), mGlExtensionList);
56    mHasNPot = hasGlExtension("GL_OES_texture_npot");
57    mHasFramebufferFetch = hasGlExtension("GL_NV_shader_framebuffer_fetch");
58    mHasDiscardFramebuffer = hasGlExtension("GL_EXT_discard_framebuffer");
59    mHasDebugMarker = hasGlExtension("GL_EXT_debug_marker");
60    mHasDebugLabel = hasGlExtension("GL_EXT_debug_label");
61    mHasTiledRendering = hasGlExtension("GL_QCOM_tiled_rendering");
62    mHas1BitStencil = hasGlExtension("GL_OES_stencil1");
63    mHas4BitStencil = hasGlExtension("GL_OES_stencil4");
64    mHasUnpackSubImage = hasGlExtension("GL_EXT_unpack_subimage");
65
66    // Query EGL extensions
67    findExtensions(eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS), mEglExtensionList);
68
69    char property[PROPERTY_VALUE_MAX];
70    if (property_get(PROPERTY_DEBUG_NV_PROFILING, property, NULL) > 0) {
71        mHasNvSystemTime = !strcmp(property, "true") && hasEglExtension("EGL_NV_system_time");
72    } else {
73        mHasNvSystemTime = false;
74    }
75
76    const char* version = (const char*) glGetString(GL_VERSION);
77
78    // Section 6.1.5 of the OpenGL ES specification indicates the GL version
79    // string strictly follows this format:
80    //
81    // OpenGL<space>ES<space><version number><space><vendor-specific information>
82    //
83    // In addition section 6.1.5 describes the version number thusly:
84    //
85    // "The version number is either of the form major number.minor number or
86    // major number.minor number.release number, where the numbers all have one
87    // or more digits. The release number and vendor specific information are
88    // optional."
89
90    if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
91        // If we cannot parse the version number, assume OpenGL ES 2.0
92        mVersionMajor = 2;
93        mVersionMinor = 0;
94    }
95}
96
97Extensions::~Extensions() {
98}
99
100///////////////////////////////////////////////////////////////////////////////
101// Methods
102///////////////////////////////////////////////////////////////////////////////
103
104bool Extensions::hasGlExtension(const char* extension) const {
105   const String8 s(extension);
106   return mGlExtensionList.indexOf(s) >= 0;
107}
108
109bool Extensions::hasEglExtension(const char* extension) const {
110   const String8 s(extension);
111   return mEglExtensionList.indexOf(s) >= 0;
112}
113
114void Extensions::findExtensions(const char* extensions, SortedVector<String8>& list) const {
115    const char* current = extensions;
116    const char* head = current;
117    EXT_LOGD("Available extensions:");
118    do {
119        head = strchr(current, ' ');
120        String8 s(current, head ? head - current : strlen(current));
121        if (s.length()) {
122            list.add(s);
123            EXT_LOGD("  %s", s.string());
124        }
125        current = head + 1;
126    } while (head);
127}
128
129void Extensions::dump() const {
130   ALOGD("%s", (const char*) glGetString(GL_VERSION));
131   ALOGD("Supported GL extensions:\n%s", (const char*) glGetString(GL_EXTENSIONS));
132   ALOGD("Supported EGL extensions:\n%s", eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS));
133}
134
135}; // namespace uirenderer
136}; // namespace android
137