Extensions.h revision 9c4b79af221b53f602f946faa9ff317a596a0c39 
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(...) LOGD(__VA_ARGS__)
38#else
39    #define EXT_LOGD(...)
40#endif
41
42// Vendor strings
43
44#define VENDOR_IMG "Imagination Technologies"
45
46///////////////////////////////////////////////////////////////////////////////
47// Classes
48///////////////////////////////////////////////////////////////////////////////
49
50class Extensions {
51public:
52    Extensions() {
53        const char* buffer = (const char*) glGetString(GL_EXTENSIONS);
54        const char* current = buffer;
55        const char* head = current;
56        EXT_LOGD("Available GL extensions:");
57        do {
58            head = strchr(current, ' ');
59            String8 s(current, head ? head - current : strlen(current));
60            if (s.length()) {
61                mExtensionList.add(s);
62                EXT_LOGD("  %s", s.string());
63            }
64            current = head + 1;
65        } while (head);
66
67        mHasNPot = hasExtension("GL_OES_texture_npot");
68        mHasFramebufferFetch = hasExtension("GL_NV_shader_framebuffer_fetch");
69        mHasDiscardFramebuffer = hasExtension("GL_EXT_discard_framebuffer");
70
71        const char* vendor = (const char*) glGetString(GL_VENDOR);
72        EXT_LOGD("Vendor: %s", vendor);
73        mNeedsHighpTexCoords = strcmp(vendor, VENDOR_IMG) == 0;
74
75        // We don't need to copy the string, the OpenGL ES spec
76        // guarantees the result of glGetString to point to a
77        // static string as long as our OpenGL context is valid
78        mExtensions = buffer;
79    }
80
81    inline bool hasNPot() const { return mHasNPot; }
82    inline bool hasFramebufferFetch() const { return mHasFramebufferFetch; }
83    inline bool needsHighpTexCoords() const { return mNeedsHighpTexCoords; }
84    inline bool hasDiscardFramebuffer() const { return mHasDiscardFramebuffer; }
85
86    bool hasExtension(const char* extension) const {
87        const String8 s(extension);
88        return mExtensionList.indexOf(s) >= 0;
89    }
90
91    void dump() {
92        LOGD("Supported extensions:\n%s", mExtensions);
93    }
94
95private:
96    SortedVector<String8> mExtensionList;
97
98    const char* mExtensions;
99
100    bool mHasNPot;
101    bool mNeedsHighpTexCoords;
102    bool mHasFramebufferFetch;
103    bool mHasDiscardFramebuffer;
104}; // class Extensions
105
106}; // namespace uirenderer
107}; // namespace android
108
109#endif // ANDROID_HWUI_EXTENSIONS_H
110