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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
#include "../modules.h"
#if LIBJIN_MODULES_RENDER
#include "../utils/macros.h"
#include "canvas.h"
#include "window.h"
namespace jin
{
namespace graphics
{
/*class member*/ GLint Canvas::cur = -1;
/*class member*/ Canvas* Canvas::createCanvas(int w, int h)
{
return new Canvas(w, h);
}
Canvas::Canvas(int w, int h)
: Drawable(w, h)
{
vertCoord[0] = 0; vertCoord[1] = 0;
vertCoord[2] = 0; vertCoord[3] = h;
vertCoord[4] = w; vertCoord[5] = h;
vertCoord[6] = w; vertCoord[7] = 0;
textCoord[0] = 0; textCoord[1] = 1;
textCoord[2] = 0; textCoord[3] = 0;
textCoord[4] = 1; textCoord[5] = 0;
textCoord[6] = 1; textCoord[7] = 1;
GLint current_fbo;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, ¤t_fbo);
/* generate a new render buffer object */
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
/* generate texture save target */
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
/* unbind framebuffer */
glBindFramebuffer(GL_FRAMEBUFFER, current_fbo);
}
Canvas::~Canvas()
{
}
bool Canvas::hasbind(GLint fbo)
{
return cur == fbo;
}
/**
* bind to canvas
*/
void Canvas::bind()
{
if (hasbind(fbo)) return;
cur = fbo;
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glViewport(0, 0, size.w, size.h);
glOrtho(0, size.w, size.h, 0, -1, 1);
/* Switch back to modelview matrix */
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
}
/**
* bind to default screen render buffer.
*/
/*class member*/ void Canvas::unbind()
{
if (hasbind(0)) return;
cur = 0;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
Window* wnd = Window::get();
int ww = wnd->getW();
int wh = wnd->getH();
glViewport(0, 0, ww, wh);
/* load back to normal */
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
/* set viewport matrix */
glOrtho(0, ww, wh, 0, -1, 1);
/* switch to model matrix */
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
}
} // render
} // jin
#endif // LIBJIN_MODULES_RENDER
|
