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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLCamera.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkOpenGLCamera.h"
#include "vtkMatrix4x4.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLRenderer.h"
#include "vtkOutputWindow.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkOpenGLError.h"
#include "vtkgluPickMatrix.h"
#include "vtkOpenGL.h"
#include <math.h>
vtkStandardNewMacro(vtkOpenGLCamera);
// Implement base class method.
void vtkOpenGLCamera::Render(vtkRenderer *ren)
{
vtkOpenGLClearErrorMacro();
double aspect[2];
int lowerLeft[2];
int usize, vsize;
vtkMatrix4x4 *matrix = vtkMatrix4x4::New();
vtkOpenGLRenderWindow *win = vtkOpenGLRenderWindow::SafeDownCast(ren->GetRenderWindow());
// find out if we should stereo render
this->Stereo = (ren->GetRenderWindow())->GetStereoRender();
ren->GetTiledSizeAndOrigin(&usize, &vsize, lowerLeft, lowerLeft+1);
// if were on a stereo renderer draw to special parts of screen
if (this->Stereo)
{
switch ((ren->GetRenderWindow())->GetStereoType())
{
case VTK_STEREO_CRYSTAL_EYES:
if (this->LeftEye)
{
if (ren->GetRenderWindow()->GetDoubleBuffer())
{
glDrawBuffer(static_cast<GLenum>(win->GetBackLeftBuffer()));
glReadBuffer(static_cast<GLenum>(win->GetBackLeftBuffer()));
}
else
{
glDrawBuffer(static_cast<GLenum>(win->GetFrontLeftBuffer()));
glReadBuffer(static_cast<GLenum>(win->GetFrontLeftBuffer()));
}
}
else
{
if (ren->GetRenderWindow()->GetDoubleBuffer())
{
glDrawBuffer(static_cast<GLenum>(win->GetBackRightBuffer()));
glReadBuffer(static_cast<GLenum>(win->GetBackRightBuffer()));
}
else
{
glDrawBuffer(static_cast<GLenum>(win->GetFrontRightBuffer()));
glReadBuffer(static_cast<GLenum>(win->GetFrontRightBuffer()));
}
}
break;
case VTK_STEREO_LEFT:
this->LeftEye = 1;
break;
case VTK_STEREO_RIGHT:
this->LeftEye = 0;
break;
default:
break;
}
}
else
{
if (ren->GetRenderWindow()->GetDoubleBuffer())
{
glDrawBuffer(static_cast<GLenum>(win->GetBackBuffer()));
// Reading back buffer means back left. see OpenGL spec.
// because one can write to two buffers at a time but can only read from
// one buffer at a time.
glReadBuffer(static_cast<GLenum>(win->GetBackBuffer()));
}
else
{
glDrawBuffer(static_cast<GLenum>(win->GetFrontBuffer()));
// Reading front buffer means front left. see OpenGL spec.
// because one can write to two buffers at a time but can only read from
// one buffer at a time.
glReadBuffer(static_cast<GLenum>(win->GetFrontBuffer()));
}
}
glViewport(lowerLeft[0], lowerLeft[1], usize, vsize);
glEnable(GL_SCISSOR_TEST);
glScissor(lowerLeft[0], lowerLeft[1], usize, vsize);
// some renderer subclasses may have more complicated computations for the
// aspect ratio. So take that into account by computing the difference
// between our simple aspect ratio and what the actual renderer is reporting.
ren->ComputeAspect();
ren->GetAspect(aspect);
double aspect2[2];
ren->vtkViewport::ComputeAspect();
ren->vtkViewport::GetAspect(aspect2);
double aspectModification = aspect[0] * aspect2[1] / (aspect[1] * aspect2[0]);
glMatrixMode(GL_PROJECTION);
if (usize && vsize)
{
matrix->DeepCopy(this->GetProjectionTransformMatrix(
aspectModification * usize / vsize, -1, 1));
matrix->Transpose();
}
if (ren->GetIsPicking())
{
int size[2] = {usize, vsize};
glLoadIdentity();
vtkgluPickMatrix(ren->GetPickX(), ren->GetPickY(),
ren->GetPickWidth(), ren->GetPickHeight(),
lowerLeft, size);
glMultMatrixd(matrix->Element[0]);
}
else
{
// insert camera view transformation
glLoadMatrixd(matrix->Element[0]);
}
// push the model view matrix onto the stack, make sure we
// adjust the mode first
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
matrix->DeepCopy(this->GetViewTransformMatrix());
matrix->Transpose();
// insert camera view transformation
glMultMatrixd(matrix->Element[0]);
if ((ren->GetRenderWindow())->GetErase() && ren->GetErase()
&& !ren->GetIsPicking())
{
ren->Clear();
}
matrix->Delete();
vtkOpenGLCheckErrorMacro("failed after Render");
}
//----------------------------------------------------------------------------
void vtkOpenGLCamera::UpdateViewport(vtkRenderer *ren)
{
vtkOpenGLClearErrorMacro();
int lowerLeft[2];
int usize, vsize;
ren->GetTiledSizeAndOrigin(&usize, &vsize, lowerLeft, lowerLeft+1);
glViewport(lowerLeft[0], lowerLeft[1], usize, vsize);
glEnable(GL_SCISSOR_TEST);
glScissor(lowerLeft[0], lowerLeft[1], usize, vsize);
vtkOpenGLCheckErrorMacro("failed after UpdateViewport");
}
//----------------------------------------------------------------------------
void vtkOpenGLCamera::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}
|
