1/*
2 * Copyright (C) 2010 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#ifndef ANDROID_HWUI_EXTENSIONS_H
18#define ANDROID_HWUI_EXTENSIONS_H
19
20#include <utils/SortedVector.h>
21#include <utils/String8.h>
22
23#include <GLES2/gl2.h>
24#include <GLES2/gl2ext.h>
25
26#include "Debug.h"
27
28namespace android {
29namespace uirenderer {
30
31///////////////////////////////////////////////////////////////////////////////
32// Defines
33///////////////////////////////////////////////////////////////////////////////
34
35// Debug
36#if DEBUG_EXTENSIONS
37    #define EXT_LOGD(...) ALOGD(__VA_ARGS__)
38#else
39    #define EXT_LOGD(...)
40#endif
41
42// Vendor strings
43#define VENDOR_IMG "Imagination Technologies"
44
45///////////////////////////////////////////////////////////////////////////////
46// Classes
47///////////////////////////////////////////////////////////////////////////////
48
49class Extensions {
50public:
51    Extensions() {
52        const char* buffer = (const char*) glGetString(GL_EXTENSIONS);
53        const char* current = buffer;
54        const char* head = current;
55        EXT_LOGD("Available GL extensions:");
56        do {
57            head = strchr(current, ' ');
58            String8 s(current, head ? head - current : strlen(current));
59            if (s.length()) {
60                mExtensionList.add(s);
61                EXT_LOGD("  %s", s.string());
62            }
63            current = head + 1;
64        } while (head);
65
66        mHasNPot = hasExtension("GL_OES_texture_npot");
67        mHasFramebufferFetch = hasExtension("GL_NV_shader_framebuffer_fetch");
68        mHasDiscardFramebuffer = hasExtension("GL_EXT_discard_framebuffer");
69        mHasDebugMarker = hasExtension("GL_EXT_debug_marker");
70        mHasDebugLabel = hasExtension("GL_EXT_debug_label");
71
72        const char* vendor = (const char*) glGetString(GL_VENDOR);
73        EXT_LOGD("Vendor: %s", vendor);
74        mNeedsHighpTexCoords = strcmp(vendor, VENDOR_IMG) == 0;
75
76        // We don't need to copy the string, the OpenGL ES spec
77        // guarantees the result of glGetString to point to a
78        // static string as long as our OpenGL context is valid
79        mExtensions = buffer;
80    }
81
82    inline bool hasNPot() const { return mHasNPot; }
83    inline bool hasFramebufferFetch() const { return mHasFramebufferFetch; }
84    inline bool needsHighpTexCoords() const { return mNeedsHighpTexCoords; }
85    inline bool hasDiscardFramebuffer() const { return mHasDiscardFramebuffer; }
86    inline bool hasDebugMarker() const { return mHasDebugMarker; }
87    inline bool hasDebugLabel() const { return mHasDebugLabel; }
88
89    bool hasExtension(const char* extension) const {
90        const String8 s(extension);
91        return mExtensionList.indexOf(s) >= 0;
92    }
93
94    void dump() {
95        ALOGD("Supported extensions:\n%s", mExtensions);
96    }
97
98private:
99    SortedVector<String8> mExtensionList;
100
101    const char* mExtensions;
102
103    bool mHasNPot;
104    bool mNeedsHighpTexCoords;
105    bool mHasFramebufferFetch;
106    bool mHasDiscardFramebuffer;
107    bool mHasDebugMarker;
108    bool mHasDebugLabel;
109}; // class Extensions
110
111}; // namespace uirenderer
112}; // namespace android
113
114#endif // ANDROID_HWUI_EXTENSIONS_H
115