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      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 
     29 namespace android {
     30 
     31 using namespace uirenderer;
     32 ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
     33 
     34 namespace 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 
     51 Extensions::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 
     97 bool Extensions::hasGlExtension(const char* extension) const {
     98    const String8 s(extension);
     99    return mGlExtensionList.indexOf(s) >= 0;
    100 }
    101 
    102 bool Extensions::hasEglExtension(const char* extension) const {
    103    const String8 s(extension);
    104    return mEglExtensionList.indexOf(s) >= 0;
    105 }
    106 
    107 void 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 
    122 void 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