Extensions.h revision 7077506f9945b87b02bdd47ffce75a5b813c821c 
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
70        const char* vendor = (const char*) glGetString(GL_VENDOR);
71        EXT_LOGD("Vendor: %s", vendor);
72        mNeedsHighpTexCoords = strcmp(vendor, VENDOR_IMG) == 0;
73
74        // We don't need to copy the string, the OpenGL ES spec
75        // guarantees the result of glGetString to point to a
76        // static string as long as our OpenGL context is valid
77        mExtensions = buffer;
78    }
79
80    inline bool hasNPot() const { return mHasNPot; }
81    inline bool hasFramebufferFetch() const { return mHasFramebufferFetch; }
82    inline bool needsHighpTexCoords() const { return mNeedsHighpTexCoords; }
83
84    bool hasExtension(const char* extension) const {
85        const String8 s(extension);
86        return mExtensionList.indexOf(s) >= 0;
87    }
88
89    void dump() {
90        LOGD("Supported extensions:\n%s", mExtensions);
91    }
92
93private:
94    SortedVector<String8> mExtensionList;
95
96    const char* mExtensions;
97
98    bool mHasNPot;
99    bool mNeedsHighpTexCoords;
100    bool mHasFramebufferFetch;
101}; // class Extensions
102
103}; // namespace uirenderer
104}; // namespace android
105
106#endif // ANDROID_HWUI_EXTENSIONS_H
107