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
|
/* OpenSceneGraph example, osgshadercomposition.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
#include <osg/PositionAttitudeTransform>
// pull in the old shader composition implementation function
extern osg::Node* createOldShaderCompositionScene(osg::ArgumentParser& arguments);
osg::Node* createNewShaderCompositionScene(osg::ArgumentParser& arguments)
{
osg::ref_ptr<osg::Node> node = osgDB::readRefNodeFiles(arguments);
if (!node) return 0;
osg::ref_ptr<osg::Group> group = new osg::Group;
osg::ref_ptr<osg::StateSet> stateset = group->getOrCreateStateSet();
osg::ref_ptr<osg::Program> program = new osg::Program;
stateset->setAttribute(program.get());
osg::ref_ptr<osg::Shader> lighting_shader = osgDB::readRefShaderFile("shaders/lighting.vert");
if (lighting_shader.valid())
{
program->addShader(lighting_shader.get());
OSG_NOTICE<<"Adding lighting shader"<<std::endl;
}
osg::ref_ptr<osg::Shader> vertex_shader = osgDB::readRefShaderFile("shaders/osgshadercomposition.vert");
if (vertex_shader.valid())
{
program->addShader(vertex_shader.get());
OSG_NOTICE<<"Adding vertex shader"<<std::endl;
}
osg::ref_ptr<osg::Shader> fragment_shader = osgDB::readRefShaderFile("shaders/osgshadercomposition.frag");
if (fragment_shader.valid())
{
program->addShader(fragment_shader.get());
OSG_NOTICE<<"Adding fragment shader"<<std::endl;
}
stateset->addUniform(new osg::Uniform("texture0", 0));
double spacing = node->getBound().radius() * 2.0;
osg::Vec3d position(0.0,0.0,0.0);
{
// first subgraph, one the left, just inherit all the defaults
osg::PositionAttitudeTransform* pat = new osg::PositionAttitudeTransform;
pat->setPosition(position);
pat->addChild(node.get());
position.x() += spacing;
group->addChild(pat);
}
{
// second subgraph, enable lighting by passing a GL_LIGHTING defines to the shaders
// As the lighting.vert shader has a #pragma requires(GL_LIGHTING) in the shader it
// instructs the osg::Prorgam to link in this shader only when the GL_LIGHTING define
// is provided. The osgshadercomposition.vert also has a #pragma import_defines(GL_LIGHTING ..) so
// when the GL_LIGHTING is provided it'll enable the lighting paths in the osgshadercomposition.vert
// shader calling the lighting function per vertex
osg::PositionAttitudeTransform* pat = new osg::PositionAttitudeTransform;
pat->setPosition(position);
pat->getOrCreateStateSet()->setDefine("LIGHTING");
pat->addChild(node.get());
position.x() += spacing;
group->addChild(pat);
}
{
// third subgraph, enable texturing by passing the GL_TEXTURE_2D define to the shaders.
// Both the osgshadercomposition.vert and osgshadercomposition.frag shaders have a
// #pragma import_defines(GL_TEXTURE_2D) so that can use this define to enable the
// passing of texture coordinates between the vertex and framgment shaders and for
// the fragment shader to read the texture of unit 0 (provided by the "texture0" uniform above.
osg::PositionAttitudeTransform* pat = new osg::PositionAttitudeTransform;
pat->setPosition(position);
pat->getOrCreateStateSet()->setDefine("TEXTURE_2D");
pat->addChild(node.get());
position.x() += spacing;
group->addChild(pat);
}
{
// fourth subgraph, enable texturing and lighting
osg::PositionAttitudeTransform* pat = new osg::PositionAttitudeTransform;
pat->setPosition(position);
pat->getOrCreateStateSet()->setDefine("LIGHTING");
pat->getOrCreateStateSet()->setDefine("TEXTURE_2D");
pat->addChild(node.get());
position.x() += spacing;
group->addChild(pat);
}
{
// fourth subgraph, enable texturing and lighting
osg::PositionAttitudeTransform* pat = new osg::PositionAttitudeTransform;
pat->setPosition(position);
pat->getOrCreateStateSet()->setDefine("LIGHTING");
pat->getOrCreateStateSet()->setDefine("TEXTURE_2D");
pat->getOrCreateStateSet()->setDefine("VERTEX_FUNC(v)", "vec4(v.x, v.y, v.z * sin(osg_SimulationTime), v.w)");
pat->addChild(node.get());
position.x() += spacing;
group->addChild(pat);
}
group->addChild(node.get());
return group.release();
}
int main( int argc, char **argv )
{
osg::ArgumentParser arguments(&argc,argv);
osgViewer::Viewer viewer(arguments);
viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
if (arguments.read("--old"))
{
// use deprecated shader composition infrastructure
osg::ref_ptr<osg::Node> scenegraph = createOldShaderCompositionScene(arguments);
if (!scenegraph) return 1;
viewer.setSceneData(scenegraph.get());
viewer.realize();
// enable shader composition
osgViewer::Viewer::Windows windows;
viewer.getWindows(windows);
for(osgViewer::Viewer::Windows::iterator itr = windows.begin();
itr != windows.end();
++itr)
{
(*itr)->getState()->setShaderCompositionEnabled(true);
}
}
else
{
// use new #pragma(tic) shader composition.
osg::ref_ptr<osg::Node> scenegraph = createNewShaderCompositionScene(arguments);
if (!scenegraph) return 1;
viewer.setSceneData(scenegraph.get());
}
return viewer.run();
}
|
