Osg-OsgShader着色器(Qt5.14.2+osgE3.6.5+win10)-No20-OsgShader
作者：互联网
相关资料：
https://www.freesion.com/article/1874284521/ 原文
实例代码：
.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
View Code
main.cpp
1 // 原文
2 // https://www.freesion.com/article/1874284521/
3 #include <osgViewer/Viewer>
4 #include <osgDB/ReadFile>
5 #include <osg/Shape>
6 #include <osg/ShapeDrawable>
7 #include <osg/MatrixTransform>
8
9 static const char * vertexShader = {
10 "#version 140 \n"
11 "in vec4 MCvertex; \n"
12 "in vec3 MCnormal; \n"
13 "in vec3 osg_SimulationTime; \n"
14 "uniform mat4 osg_ModelViewMatrix; \n"
15 "uniform mat4 osg_ModelViewProjectionMatrix;\n"
16 "uniform mat3 osg_NormalMatrix;\n"
17 "uniform vec3 LightPosition ;\n"
18 "const float SpecularContribution = 0.3;\n"
19 "const float DiffuseContribution = 1.0 - SpecularContribution;\n"
20 "out float LightIntensity;\n"
21 "out vec2 MCposition;\n"
22 "void main()\n"
23 "{\n"
24 " vec3 ecPosition = vec3(osg_ModelViewMatrix * MCvertex); \n"
25 " vec3 tnorm = normalize(osg_NormalMatrix * MCnormal); \n"
26 " vec3 lightVec = normalize(vec3(LightPosition[0],LightPosition[1],LightPosition[2]*osg_SimulationTime) - ecPosition); \n"
27 " vec3 reflectVec = reflect(-lightVec, tnorm); \n"
28 " vec3 viewVec = normalize(-ecPosition); \n"
29 " float diffuse = max(dot(lightVec, tnorm), 0.0); \n"
30 " float spec = 0.0; \n"
31 " if (diffuse > 0.0) \n"
32 " {\n"
33 " spec = max(dot(reflectVec, viewVec), 0.0);\n"
34 " spec = pow(spec, 16.0);\n"
35 " }\n"
36 " LightIntensity = DiffuseContribution * diffuse + SpecularContribution * spec;\n"
37 " MCposition = MCvertex.xy;\n"
38 " gl_Position = osg_ModelViewProjectionMatrix * MCvertex;\n"
39 "} \n"
40 };
41
42
43 static const char * fragShader = {
44 " #version 140 \n"
45 " uniform vec3 BrickColor = vec3(0,1,1), MortarColor = vec3(1,0,1);\n"
46 " uniform vec2 BrickSize = vec2(0.3,0.15);\n"
47 " uniform vec2 BrickPct = vec2(0.9,0.85);\n"
48 " in vec2 MCposition;\n"
49 " in float LightIntensity;\n"
50 " out vec4 FragColor;\n"
51 " void main()\n"
52 " {\n"
53 " vec3 color;\n"
54 " vec2 position, useBrick;\n"
55 " position = MCposition / BrickSize;\n"
56 " if (fract(position.y * 0.5) > 0.5)\n"
57 " position.x += 0.5;\n"
58 " position = fract(position);\n"
59 " useBrick = step(position, BrickPct);\n"
60 " color = mix(MortarColor, BrickColor, useBrick.x * useBrick.y);\n"
61 " color *= LightIntensity;\n"
62 " FragColor = vec4(color, 1.0);\n"
63 "}\n"
64 };
65 osg::Node * CreateNode()
66 {
67 osg::Geode * geode = new osg::Geode;
68 osg::Geometry* polyGeom = new osg::Geometry();
69 osg::Vec3Array* vertices = new osg::Vec3Array();
70 vertices->push_back(osg::Vec3(-10, 0, 0));
71 vertices->push_back(osg::Vec3(10, 0, 0));
72 vertices->push_back(osg::Vec3(0, 10, 10));
73 polyGeom->setVertexArray(vertices);
74
75
76 osg::ref_ptr<osg::Vec4Array> colorsArray = new osg::Vec4Array;
77 colorsArray->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f));
78 colorsArray->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f));
79 colorsArray->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f));
80 polyGeom->setColorArray(colorsArray.get());
81 polyGeom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
82
83 osg::Vec3Array* normals = new osg::Vec3Array;
84 normals->push_back(osg::Vec3(0.0f, 1.0f, 0.0f));
85 normals->push_back(osg::Vec3(0.0f, 0.0f, 1.0f));
86 normals->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
87 polyGeom->setNormalArray(normals);
88 polyGeom->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
89
90
91 polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES, 0, 3));
92
93 polyGeom->setVertexAttribArray(0, vertices);
94 polyGeom->setVertexAttribBinding(0, osg::Geometry::BIND_PER_VERTEX);
95 polyGeom->setVertexAttribArray(1, colorsArray.get());
96 polyGeom->setVertexAttribBinding(1, osg::Geometry::BIND_PER_VERTEX);
97 polyGeom->setVertexAttribArray(2, normals);
98 polyGeom->setVertexAttribBinding(2, osg::Geometry::BIND_PER_VERTEX);
99
100 geode->addDrawable(polyGeom);
101 return geode;
102 }
103
104
105 osg::MatrixTransform * lightPos;
106
107 class MyNodeVisitor : public osg::NodeVisitor
108 {
109 public:
110 MyNodeVisitor() :osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN){}
111
112 virtual void apply(osg::Geode& node)
113 {
114 for (int i = 0; i < node.getNumParents(); ++i)
115 {
116 osg::Geometry * polyGeom = dynamic_cast<osg::Geometry*>(node.getDrawable(i));
117
118 if (!polyGeom)return;
119
120 polyGeom->setVertexAttribArray(0, polyGeom->getVertexArray());
121 polyGeom->setVertexAttribBinding(0, osg::Geometry::BIND_PER_VERTEX);
122 polyGeom->setVertexAttribArray(1, polyGeom->getColorArray());
123 polyGeom->setVertexAttribBinding(1, osg::Geometry::BIND_PER_VERTEX);
124 polyGeom->setVertexAttribArray(2, polyGeom->getNormalArray());
125 polyGeom->setVertexAttribBinding(2, polyGeom->getNormalBinding());
126 }
127 }
128 };
129
130
131 class LightPosCallback : public osg::Uniform::Callback
132 {
133 public:
134 LightPosCallback()
135 {
136 }
137 virtual void operator()(osg::Uniform* uniform, osg::NodeVisitor* nv)
138 {
139 osg::Matrix m = lightPos->getMatrix();
140 uniform->set(m.getTrans());
141 }
142 };
143
144 osg::Node * createlight()
145 {
146 osg::ShapeDrawable *sun_sd = new osg::ShapeDrawable;
147 osg::Sphere* sun_sphere = new osg::Sphere;
148 sun_sphere->setName("SunSphere");
149 sun_sphere->setRadius(0.5);
150 sun_sd->setShape(sun_sphere);
151 sun_sd->setColor(osg::Vec4(1.0, 0.0, 0.0, 1.0));
152
153 osg::Geode* sun_geode = new osg::Geode;
154 sun_geode->setName("SunGeode");
155 sun_geode->addDrawable(sun_sd);
156
157 return sun_geode;
158 }
159
160
161 class KeyboardEventHandler : public osgGA::GUIEventHandler
162 {
163 public:
164
165 KeyboardEventHandler(){}
166
167 virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&)
168 {
169 switch (ea.getEventType())
170 {
171 case(osgGA::GUIEventAdapter::KEYDOWN) :
172 {
173 if (ea.getKey() == 'x')//绕x轴旋转
174 {
175 osg::Matrix trans = lightPos->getMatrix();
176 trans = trans * osg::Matrix::rotate(osg::PI_2 / 10, osg::X_AXIS);
177 lightPos->setMatrix(trans);
178 }
179 if (ea.getKey() == 'y')//绕y轴旋转
180 {
181 osg::Matrix trans = lightPos->getMatrix();
182 trans = trans * osg::Matrix::rotate(osg::PI_2 / 10, osg::Y_AXIS);
183 lightPos->setMatrix(trans);
184 }
185 if (ea.getKey() == 'z')//绕z轴旋转
186 {
187 osg::Matrix trans = lightPos->getMatrix();
188 trans = trans * osg::Matrix::rotate(osg::PI_2 / 10, osg::Z_AXIS);
189 lightPos->setMatrix(trans);
190 }
191 }
192 }
193
194 return false;
195 }
196 };
197 int main()
198 {
199 osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
200 osg::ref_ptr<osg::Node> geode = osgDB::readNodeFile("D:/Gitee/OsgTestQt/src/No20-OsgShader/cow.osg");//CreateNode();
201
202 MyNodeVisitor visitor;
203 geode->accept(visitor);
204
205
206 osg::ref_ptr<osg::StateSet> stateSet = geode->getOrCreateStateSet();
207
208 osg::ref_ptr<osg::Shader> vShader = new osg::Shader(osg::Shader::VERTEX, vertexShader);
209 osg::ref_ptr<osg::Shader> fShader = new osg::Shader(osg::Shader::FRAGMENT, fragShader);
210 osg::ref_ptr<osg::Program> program = new osg::Program;
211 program->addShader(vShader.get());
212 program->addShader(fShader.get());
213
214 program->addBindAttribLocation("MCvertex", 0);
215 program->addBindAttribLocation("MCnormal", 2);
216
217
218
219 osg::ref_ptr<osg::Uniform> M4 = new osg::Uniform("LightPosition", osg::Vec3d(2, 0, 0));
220 M4->setUpdateCallback(new LightPosCallback());
221 stateSet->addUniform(M4.get());
222
223 stateSet->setAttributeAndModes(program.get(), osg::StateAttribute::ON);
224
225 lightPos = new osg::MatrixTransform;
226 lightPos->setMatrix(osg::Matrix::translate(0, 0, 5));
227 lightPos->addChild(createlight());
228
229 osg::Group * root = new osg::Group;
230 //root->addChild(osgDB::readNodeFile("d:/ah64_apache.3ds"));
231 root->addChild(lightPos);
232 root->addChild(geode);
233
234
235 viewer->addEventHandler(new KeyboardEventHandler());
236 viewer->setSceneData(root);
237 viewer->setUpViewInWindow(35, 35, 500, 500);
238
239 viewer->realize();
240 osg::State* state = viewer->getCamera()->getGraphicsContext()->getState();
241 state->setUseModelViewAndProjectionUniforms(true);
242
243
244 return viewer->run();
245 }
View Code
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<iframe></iframe>标签：Qt5.14,1.0,0.0,polyGeom,osgE3.6,vec3,new,osg,OsgShader 来源： https://www.cnblogs.com/FKdelphi/p/16473579.html