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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 #include "Debug.h"
     18 #include "Extensions.h"
     19 
     20 namespace android {
     21 
     22 using namespace uirenderer;
     23 ANDROID_SINGLETON_STATIC_INSTANCE(Extensions);
     24 
     25 namespace uirenderer {
     26 
     27 ///////////////////////////////////////////////////////////////////////////////
     28 // Defines
     29 ///////////////////////////////////////////////////////////////////////////////
     30 
     31 // Debug
     32 #if DEBUG_EXTENSIONS
     33     #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
     34 #else
     35     #define EXT_LOGD(...)
     36 #endif
     37 
     38 ///////////////////////////////////////////////////////////////////////////////
     39 // Constructors
     40 ///////////////////////////////////////////////////////////////////////////////
     41 
     42 Extensions::Extensions(): Singleton<Extensions>() {
     43     const char* buffer = (const char*) glGetString(GL_EXTENSIONS);
     44     const char* current = buffer;
     45     const char* head = current;
     46     EXT_LOGD("Available GL extensions:");
     47     do {
     48         head = strchr(current, ' ');
     49         String8 s(current, head ? head - current : strlen(current));
     50         if (s.length()) {
     51             mExtensionList.add(s);
     52             EXT_LOGD("  %s", s.string());
     53         }
     54         current = head + 1;
     55     } while (head);
     56 
     57     mHasNPot = hasExtension("GL_OES_texture_npot");
     58     mHasFramebufferFetch = hasExtension("GL_NV_shader_framebuffer_fetch");
     59     mHasDiscardFramebuffer = hasExtension("GL_EXT_discard_framebuffer");
     60     mHasDebugMarker = hasExtension("GL_EXT_debug_marker");
     61     mHasDebugLabel = hasExtension("GL_EXT_debug_label");
     62     mHasTiledRendering = hasExtension("GL_QCOM_tiled_rendering");
     63     mHas1BitStencil = hasExtension("GL_OES_stencil1");
     64     mHas4BitStencil = hasExtension("GL_OES_stencil4");
     65 
     66     mExtensions = strdup(buffer);
     67 
     68     const char* version = (const char*) glGetString(GL_VERSION);
     69     mVersion = strdup(version);
     70 
     71     // Section 6.1.5 of the OpenGL ES specification indicates the GL version
     72     // string strictly follows this format:
     73     //
     74     // OpenGL<space>ES<space><version number><space><vendor-specific information>
     75     //
     76     // In addition section 6.1.5 describes the version number thusly:
     77     //
     78     // "The version number is either of the form major number.minor number or
     79     // major number.minor number.release number, where the numbers all have one
     80     // or more digits. The release number and vendor specific information are
     81     // optional."
     82 
     83     if (sscanf(version, "OpenGL ES %d.%d", &mVersionMajor, &mVersionMinor) !=2) {
     84         // If we cannot parse the version number, assume OpenGL ES 2.0
     85         mVersionMajor = 2;
     86         mVersionMinor = 0;
     87     }
     88 }
     89 
     90 Extensions::~Extensions() {
     91    free(mExtensions);
     92    free(mVersion);
     93 }
     94 
     95 ///////////////////////////////////////////////////////////////////////////////
     96 // Methods
     97 ///////////////////////////////////////////////////////////////////////////////
     98 
     99 bool Extensions::hasExtension(const char* extension) const {
    100    const String8 s(extension);
    101    return mExtensionList.indexOf(s) >= 0;
    102 }
    103 
    104 void Extensions::dump() const {
    105    ALOGD("%s", mVersion);
    106    ALOGD("Supported extensions:\n%s", mExtensions);
    107 }
    108 
    109 }; // namespace uirenderer
    110 }; // namespace android
    111