Added osgshadermultiviewport example to test and demonstrate the new osg::ViewportIndexed class
This commit is contained in:
Laurens Voerman
Robert Osfield
parent
54dbf438cc
commit
af28adc01d
@ -103,6 +103,7 @@ IF(DYNAMIC_OPENSCENEGRAPH)
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ADD_SUBDIRECTORY(osgshaders)
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ADD_SUBDIRECTORY(osgshaders)
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ADD_SUBDIRECTORY(osgshadercomposition)
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ADD_SUBDIRECTORY(osgshadercomposition)
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ADD_SUBDIRECTORY(osgshadergen)
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ADD_SUBDIRECTORY(osgshadergen)
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ADD_SUBDIRECTORY(osgshadermultiviewport)
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ADD_SUBDIRECTORY(osgshaderterrain)
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ADD_SUBDIRECTORY(osgshaderterrain)
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# ADD_SUBDIRECTORY(osgshadercompositor)
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# ADD_SUBDIRECTORY(osgshadercompositor)
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ADD_SUBDIRECTORY(osgshadow)
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ADD_SUBDIRECTORY(osgshadow)
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5
examples/osgshadermultiviewport/CMakeLists.txt
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5
examples/osgshadermultiviewport/CMakeLists.txt
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SET(TARGET_SRC
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osgshadermultiviewport.cpp
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)
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SETUP_EXAMPLE(osgshadermultiviewport)
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182
examples/osgshadermultiviewport/osgshadermultiviewport.cpp
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182
examples/osgshadermultiviewport/osgshadermultiviewport.cpp
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/* OpenSceneGraph example, osgshadermultiviewport.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <osgViewer/Viewer>
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#include <osgDB/ReadFile>
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#include <osg/StateSet>
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#include <osg/Texture2D>
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#include <osg/ViewportIndexed>
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void createShaderCompositionStateSet(osg::StateSet *stateSet) {
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stateSet->setDefine("LIGHTING");
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stateSet->setDefine("TEXTURE_2D");
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//add a global (dummy) texture, to fill in for missing textures.
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osg::Image* image = new osg::Image;
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unsigned char* imageData = new unsigned char[4];
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*((int *)(imageData)) = 0xFFFF0000;//blue
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image->setImage(1, 1, 1, GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, imageData, osg::Image::USE_NEW_DELETE, 1);
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osg::Texture2D* texture = new osg::Texture2D(image);
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stateSet->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
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//handle the alpha values
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stateSet->setDefine("ALPHA_FUNC(a)", "if (a < 0.5) discard;");
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osg::ref_ptr<osg::Program> program = new osg::Program;
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stateSet->setAttribute(program.get());
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stateSet->addUniform(new osg::Uniform("texture0", 0));
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//////////////////////////
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osg::ref_ptr<osg::Shader> ts =
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new osg::Shader(osg::Shader::GEOMETRY,
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"#version 330 core\n"
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"#extension GL_ARB_gpu_shader5 : enable\n"
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"#extension GL_NV_viewport_array : enable\n"
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"layout (triangles, invocations = 2) in;\n"
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"layout (triangle_strip, max_vertices = 3) out;\n"
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"uniform mat4 transform_block[2];\n"
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"in vec4 vbasecolor[];\n"
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"in vec2 vtexcoord[];\n"
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"out vec4 basecolor;\n"
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"out vec2 texcoord;\n"
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"out int gl_Layer;\n"
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"void main(void) {\n"
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" for (int i = 0; i < gl_in.length(); i++)\n"
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" {"
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" basecolor = vec4(1,1,1,1);"
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" texcoord = vtexcoord[i];\n"
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" gl_ViewportIndex = gl_InvocationID;\n"
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" gl_Position = transform_block[gl_InvocationID] * gl_in[i].gl_Position;\n"
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" EmitVertex();\n"
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" }\n"
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" EndPrimitive();\n"
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"}\n"
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);
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program->addShader(ts.get());
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osg::ref_ptr<osg::Shader> vertex_shader =
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new osg::Shader(osg::Shader::VERTEX,
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"#version 120\n"
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"#pragma import_defines ( LIGHTING )\n"
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"#ifdef LIGHTING\n"
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"void directionalLight( int lightNum, vec3 normal, inout vec4 color )"
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"{"
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" vec3 n = normalize(gl_NormalMatrix * normal);"
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" float NdotL = dot( n, normalize(gl_LightSource[lightNum].position.xyz) );"
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" NdotL = max( 0.0, NdotL );"
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" float NdotHV = dot( n, gl_LightSource[lightNum].halfVector.xyz );"
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" NdotHV = max( 0.0, NdotHV );"
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" color *= gl_LightSource[lightNum].ambient +"
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" gl_LightSource[lightNum].diffuse * NdotL;"
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"}\n"
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"#endif\n"
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"varying vec2 vtexcoord;"
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"varying vec4 vbasecolor;"
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"void main(void)"
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"{"
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" vbasecolor = gl_Color;\n"
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"#ifdef LIGHTING\n"
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" directionalLight( 0, gl_Normal.xyz, vbasecolor);\n"
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"#endif\n"
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" vtexcoord = gl_MultiTexCoord0.xy;"
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#if 1
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" gl_Position = gl_ModelViewMatrix * gl_Vertex;"
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#else
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" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;"
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#endif
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"}");
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program->addShader(vertex_shader.get());
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osg::ref_ptr<osg::Shader> fragment_shader =
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new osg::Shader(osg::Shader::FRAGMENT,
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"#pragma import_defines ( TEXTURE_2D )\n"
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"#pragma import_defines ( ALPHA_FUNC )\n"
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"#ifdef TEXTURE_2D\n"
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"uniform sampler2D texture0;\n"
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"varying vec2 texcoord;\n"
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"#endif\n"
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"varying vec4 basecolor;\n"
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"void main(void)\n"
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"{\n"
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"#ifdef TEXTURE_2D\n"
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" gl_FragColor = texture2D( texture0, texcoord) * basecolor;\n"
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"#ifdef ALPHA_FUNC\n"
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" ALPHA_FUNC(gl_FragColor.a)\n"
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"#endif \n"
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"#else\n"
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" gl_FragColor = basecolor;\n"
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"#endif\n"
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"}\n");
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program->addShader(fragment_shader.get());
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}
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osg::Node* createNewShaderCompositionScene(osg::ArgumentParser& arguments)
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{
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osg::ref_ptr<osg::Node> node = osgDB::readRefNodeFiles(arguments);
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if (!node) return 0;
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osg::ref_ptr<osg::Group> group = new osg::Group;
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osg::ref_ptr<osg::StateSet> stateset = group->getOrCreateStateSet();
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createShaderCompositionStateSet(stateset.get());
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group->addChild(node.get());
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return group.release();
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}
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int main( int argc, char **argv )
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{
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osg::ArgumentParser arguments(&argc,argv);
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osgViewer::Viewer viewer(arguments);
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viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
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// use new #pragma(tic) shader composition.
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osg::ref_ptr<osg::Node> scenegraph = createNewShaderCompositionScene(arguments);
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if (!scenegraph) return 1;
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osg::ref_ptr<osg::StateSet> stateSet = scenegraph->getOrCreateStateSet();
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osg::Uniform* LRuniform = stateSet->getUniform("transform_block");
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if (!LRuniform) {
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LRuniform = new osg::Uniform(osg::Uniform::FLOAT_MAT4, "transform_block", 2);
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stateSet->addUniform(LRuniform);
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}
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viewer.setSceneData(scenegraph.get());
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viewer.realize();
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double width = viewer.getCamera()->getViewport()->width();
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double height = viewer.getCamera()->getViewport()->height();
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stateSet->setAttribute(new osg::ViewportIndexed(0, 0.0, 0.0, width * 0.5, height)); // left
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stateSet->setAttribute(new osg::ViewportIndexed(1, width * 0.5, 0.0, width * 0.5, height)); // right
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osg::Camera *cam = viewer.getCamera();
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osg::Matrix matrixL = cam->getProjectionMatrix();
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LRuniform->setElement(0, matrixL);
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double l, r, b, t, n, f;
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matrixL.getFrustum(l, r, b, t, n, f);
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osg::Matrix matrixR;
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matrixR.makeFrustum(l * 2.0, r* 2.0, b* 2.0, t* 2.0, n, f);
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LRuniform->setElement(1, matrixR);
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return viewer.run();
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}
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