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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 <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 
     31 namespace android {
     32 
     33 using namespace uirenderer;
     34 ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
     35 
     36 namespace 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 
     53 Extensions::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 
     65     // Query EGL extensions
     66     findExtensions(eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS), mEglExtensionList);
     67 
     68     char property[PROPERTY_VALUE_MAX];
     69     if (property_get(PROPERTY_DEBUG_NV_PROFILING, property, NULL) > 0) {
     70         mHasNvSystemTime = !strcmp(property, "true") && hasEglExtension("EGL_NV_system_time");
     71     } else {
     72         mHasNvSystemTime = false;
     73     }
     74 
     75     const char* version = (const char*) glGetString(GL_VERSION);
     76 
     77     // Section 6.1.5 of the OpenGL ES specification indicates the GL version
     78     // string strictly follows this format:
     79     //
     80     // OpenGL<space>ES<space><version number><space><vendor-specific information>
     81     //
     82     // In addition section 6.1.5 describes the version number thusly:
     83     //
     84     // "The version number is either of the form major number.minor number or
     85     // major number.minor number.release number, where the numbers all have one
     86     // or more digits. The release number and vendor specific information are
     87     // optional."
     88 
     89     if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) != 2) {
     90         // If we cannot parse the version number, assume OpenGL ES 2.0
     91         mVersionMajor = 2;
     92         mVersionMinor = 0;
     93     }
     94 }
     95 
     96 Extensions::~Extensions() {
     97 }
     98 
     99 ///////////////////////////////////////////////////////////////////////////////
    100 // Methods
    101 ///////////////////////////////////////////////////////////////////////////////
    102 
    103 bool Extensions::hasGlExtension(const char* extension) const {
    104    const String8 s(extension);
    105    return mGlExtensionList.indexOf(s) >= 0;
    106 }
    107 
    108 bool Extensions::hasEglExtension(const char* extension) const {
    109    const String8 s(extension);
    110    return mEglExtensionList.indexOf(s) >= 0;
    111 }
    112 
    113 void Extensions::findExtensions(const char* extensions, SortedVector<String8>& list) const {
    114     const char* current = extensions;
    115     const char* head = current;
    116     EXT_LOGD("Available extensions:");
    117     do {
    118         head = strchr(current, ' ');
    119         String8 s(current, head ? head - current : strlen(current));
    120         if (s.length()) {
    121             list.add(s);
    122             EXT_LOGD("  %s", s.string());
    123         }
    124         current = head + 1;
    125     } while (head);
    126 }
    127 
    128 void Extensions::dump() const {
    129    ALOGD("%s", (const char*) glGetString(GL_VERSION));
    130    ALOGD("Supported GL extensions:\n%s", (const char*) glGetString(GL_EXTENSIONS));
    131    ALOGD("Supported EGL extensions:\n%s", eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS));
    132 }
    133 
    134 }; // namespace uirenderer
    135 }; // namespace android
    136