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
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
96Extensions::~Extensions() {
97}
98
99///////////////////////////////////////////////////////////////////////////////
100// Methods
101///////////////////////////////////////////////////////////////////////////////
102
103bool Extensions::hasGlExtension(const char* extension) const {
104   const String8 s(extension);
105   return mGlExtensionList.indexOf(s) >= 0;
106}
107
108bool Extensions::hasEglExtension(const char* extension) const {
109   const String8 s(extension);
110   return mEglExtensionList.indexOf(s) >= 0;
111}
112
113void 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
128void 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