blob: 38711a73c44aac7ae5e715e52f84957f47717479 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Base class for OpenGL ES 2.0 book examples.
#ifndef GPU_DEMOS_GLES2_BOOK_EXAMPLE_H_
#define GPU_DEMOS_GLES2_BOOK_EXAMPLE_H_
#include "gpu/command_buffer/common/logging.h"
#include "gpu/demos/framework/demo.h"
#include "third_party/gles2_book/Common/Include/esUtil.h"
namespace gpu {
namespace demos {
namespace gles2_book {
typedef int InitFunc(ESContext* context);
typedef void UpdateFunc(ESContext* context, float elapsed_sec);
typedef void DrawFunc(ESContext* context);
typedef void ShutDownFunc(ESContext* context);
// The examples taken from OpenGL 2.0 ES book follow a well-defined pattern.
// They all use one ESContext that holds a reference to a custom UserData.
// Each example provides four functions:
// 1. InitFunc to initialize OpenGL state and custom UserData
// 2. UpdateFunc is called before drawing each frame to update animation etc.
// 3. DrawFunc is called to do the actual frame rendering
// 4. ShutDownFunc is called when program terminates
// This class encapsulates this pattern to make it easier to write classes
// for each example.
template <typename UserData>
class Example : public gpu::demos::Demo {
public:
Example()
: init_func_(NULL),
update_func_(NULL),
draw_func_(NULL),
shut_down_func_(NULL) {
esInitContext(&context_);
memset(&user_data_, 0, sizeof(UserData));
context_.userData = &user_data_;
}
virtual ~Example() {
shut_down_func_(&context_);
}
virtual bool InitGL() {
// Note that update_func is optional.
CHECK(init_func_ && draw_func_ && shut_down_func_);
context_.width = width();
context_.height = height();
if (!init_func_(&context_)) return false;
return true;
}
protected:
void RegisterCallbacks(InitFunc* init_func,
UpdateFunc* update_func,
DrawFunc* draw_func,
ShutDownFunc* shut_down_func) {
init_func_ = init_func;
update_func_ = update_func;
draw_func_ = draw_func;
shut_down_func_ = shut_down_func;
}
virtual void Render(float elapsed_sec) {
if (update_func_) update_func_(&context_, elapsed_sec);
draw_func_(&context_);
}
private:
ESContext context_;
UserData user_data_;
// Callback functions.
InitFunc* init_func_;
UpdateFunc* update_func_;
DrawFunc* draw_func_;
ShutDownFunc* shut_down_func_;
DISALLOW_COPY_AND_ASSIGN(Example);
};
} // namespace gles2_book
} // namespace demos
} // namespace gpu
#endif // GPU_DEMOS_GLES2_BOOK_EXAMPLE_H_
|
