Osg-OsgShader着色器(Qt5.14.2+osgE3.6.5+win10)-No16-OsgShader
作者：互联网
.pro
1 QT += core gui widgets
2 TARGET = TestOsgQt
3 TEMPLATE = app
4 DEFINES += QT_DEPRECATED_WARNINGS
5 CONFIG += c++11
6
7 QMAKE_CXXFLAGS_RELEASE = $$QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO
8 QMAKE_LFLAGS_RELEASE = $$QMAKE_LFLAGS_RELEASE_WITH_DEBUGINFO
9
10 SOURCES += \
11 main.cpp
12
13 HEADERS +=
14
15 OsgDir = D:\\Gitee\\osg365R
16 CONFIG(release, debug|release) {
17 LIBS += -L$${OsgDir}/lib/ -losgDB -losgViewer -lOpenThreads -losgAnimation -losg \
18 -losgEarth -losgEarthAnnotation -losgEarthFeatures -losgEarthSymbology -losgEarthUtil \
19 -losgQOpenGL -losgUtil -losgText -losgTerrain -losgSim \
20 -losgShadow -losgParticle -losgManipulator -losgGA -losgFX \
21 -losgWidget
22 } else {
23 LIBS += -L$${OsgDir}/debug/lib/ -losgDBd -losgViewerd -lOpenThreadsd -losgAnimationd -losgd \
24 -losgEarthd -losgEarthAnnotationd -losgEarthFeaturesd -losgEarthSymbologyd -losgEarthUtild \
25 -losgQOpenGLd -losgUtild -losgTextd -losgTerraind -losgSimd \
26 -losgShadowd -losgParticled -losgManipulatord -losgGAd -losgFXd \
27 }
28
29
30 INCLUDEPATH += $${OsgDir}/include
31 DEPENDPATH += $${OsgDir}/include
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main.cpp
1 #include <osg/Program>
2 #include <osgDB/ReadFile>
3 #include <osgViewer/Viewer>
4
5 static const char* vertSource = {
6 "varying vec3 normal;"//易变量 用于着色器之间的传值
7 "void main()"
8 "{"
9 " normal = normalize(gl_NormalMatrix * gl_Normal);" //把法线向量从物体空间转化到视觉空间。
10 " gl_Position = ftransform();" //相当于 gl_Position = ModelViewProjectionMatrix * gl_Vertex,
11 //模型视图投影矩阵与空间顶点位置相乘，得到裁剪空间顶点位置。
12 "}"
13 };
14
15 static const char* fragSource = {
16 "uniform vec4 mainColor;" //外面程序输入的颜色
17 "varying vec3 normal;" //上面的顶点着色器传的法线
18 "void main()"
19 "{"
20 " float intensity = dot(vec3(gl_LightSource[0].position), normal);" //计算光照位置与法线的点积，为什么这么做，知道的朋友不吝赐教下。
21 //按照我的理解就是计算了一下亮度值。
22 //给输出的颜色赋值
23 " if (intensity > 0.95) gl_FragColor = mainColor;" //如果这个值大于0.95，则输出颜色为mainColor，而uniform回调中每帧在来回改这个值，所
24 //以这一部分会出现闪烁的效果。
25 " else if (intensity > 0.5) gl_FragColor = vec4(0.6,0.3,0.3,1.0);"
26 " else if (intensity > 0.25) gl_FragColor = vec4(0.4,0.2,0.2,1.0);"
27 " else gl_FragColor = vec4(0.2,0.1,0.1,1.0);"
28 "}"
29 };
30
31
32 /* 一直变量uniform回调类，主要用于每帧更新着色器中的用户数据，从而改变渲染的行为和输出结果。 */
33
34
35 class ColorCallback : public osg::Uniform::Callback
36 {
37 public:
38 ColorCallback() : _incRed(false) {}
39
40 virtual void operator()( osg::Uniform* uniform, osg::NodeVisitor* nv )
41 {
42 if ( !uniform ) return;
43
44 osg::Vec4 color;
45 uniform->get( color );//获取通过uniform 设置进去的值mainColor
46
47 if ( _incRed==true )//3、如果r减到0呢，就给他一直加。
48 {
49 if ( color.x()<1.0 ) color.x() += 0.1;
50 else _incRed = false;//4、如果加到1就给他再减。
51 }
52 else
53 {
54 if ( color.x()>0.0 ) color.x() -= 0.1;//1、如果RGB中的r分量大于0，则一直减小。
55 else _incRed = true;// 2、r减到0了。
56 }
57 uniform->set( color );
58 }
59
60 protected:
61 bool _incRed;
62 };
63
64 void createShaders( osg::StateSet& ss )
65 {
66 osg::ref_ptr<osg::Shader> vertShader = new osg::Shader( osg::Shader::VERTEX, vertSource );
67 osg::ref_ptr<osg::Shader> fragShader = new osg::Shader( osg::Shader::FRAGMENT, fragSource );
68
69 osg::ref_ptr<osg::Program> program = new osg::Program;
70 program->addShader( vertShader.get() );
71 program->addShader( fragShader.get() );
72
73 osg::ref_ptr<osg::Uniform> mainColor = new osg::Uniform( "mainColor", osg::Vec4(0.5,0.5,0.5,1.0) );//这个部分的颜色是闪烁部分的颜色值。
74 mainColor->setUpdateCallback( new ColorCallback );
75
76 ss.addUniform( mainColor.get() );
77 ss.setAttributeAndModes( program.get() );
78 }
79
80 int main( int argc, char** argv )
81 {
82 osg::ArgumentParser arguments( &argc, argv );
83 osg::Node* model = osgDB::readNodeFiles( arguments );
84 if ( !model ) model = osgDB::readNodeFile( "D:\\Gitee\\data\\cow.osg" );
85
86 createShaders( *(model->getOrCreateStateSet()) );
87
88 osgViewer::Viewer viewer;
89 viewer.setSceneData( model );
90 viewer.setUpViewInWindow(20,20,600,600);
91 return viewer.run();
92 }
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<iframe></iframe>标签：Qt5.14,No16,uniform,include,new,mainColor,gl,osg,OsgShader 来源： https://www.cnblogs.com/FKdelphi/p/16471260.html