FGFS-4.1/OpenSceneGraph
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Added experiment GLSL fragment shader to clip out dark areas of videos.

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This commit is contained in:
Robert Osfield
2005-06-08 15:57:05 +00:00
parent 38528c4952
commit ac02c37718
1 changed files with 43 additions and 9 deletions
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52
examples/osgmovie/osgmovie.cpp
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@@ -178,16 +178,15 @@ void MovieEventHandler::getUsage(osg::ApplicationUsage& usage) const
}
osg::Geometry* createTexturedQuadGeometry(const osg::Vec3& pos,float width,float height, osg::Image* image)
osg::Geometry* createTexturedQuadGeometry(const osg::Vec3& pos,float width,float height, osg::Image* image, bool useTextureRectangle)
{
bool useTextureRectangle = true;
if (useTextureRectangle)
{
osg::Geometry* pictureQuad = createTexturedQuadGeometry(pos,
osg::Vec3(width,0.0f,0.0f),
osg::Vec3(0.0f,0.0f,height),
0.0f,image->t(), image->s(),0.0f);
pictureQuad->getOrCreateStateSet()->setTextureAttributeAndModes(0,
new osg::TextureRectangle(image),
osg::StateAttribute::ON);
@@ -199,10 +198,13 @@ osg::Geometry* createTexturedQuadGeometry(const osg::Vec3& pos,float width,float
osg::Geometry* pictureQuad = createTexturedQuadGeometry(pos,
osg::Vec3(width,0.0f,0.0f),
osg::Vec3(0.0f,0.0f,height),
0.0f,0.0f, 1.0f,1.0f);
0.0f,1.0f, 1.0f,0.0f);
osg::Texture2D* texture = new osg::Texture2D(image);
texture->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
pictureQuad->getOrCreateStateSet()->setTextureAttributeAndModes(0,
new osg::Texture2D(image),
texture,
osg::StateAttribute::ON);
return pictureQuad;
@@ -220,9 +222,14 @@ int main(int argc, char** argv)
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
bool useTextureRectangle = true;
bool useShader = false;
// construct the viewer.
osgProducer::Viewer viewer(arguments);
while (arguments.read("--texture2D")) useTextureRectangle=false;
while (arguments.read("--shader")) useShader=true;
// set up the value with sensible default event handlers.
viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
@@ -244,7 +251,35 @@ int main(int argc, char** argv)
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::Vec3 pos(0.0f,0.0f,0.0f);
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
if (useShader)
{
//useTextureRectangle = false;
static const char *shaderSource = {
"uniform vec4 cutoff_color;\n"
"uniform samplerRect movie_texture;"
"void main(void)\n"
"{\n"
" vec4 texture_color = textureRect(movie_texture, gl_TexCoord[0]); \n"
" if (all(lessThanEqual(texture_color,cutoff_color))) discard; \n"
" gl_FragColor = texture_color;\n"
"}\n"
};
osg::Program* program = new osg::Program;
program->addShader(new osg::Shader(osg::Shader::FRAGMENT,shaderSource));
stateset->addUniform(new osg::Uniform("cutoff_color",osg::Vec4(0.1f,0.1f,0.1f,1.0f)));
stateset->addUniform(new osg::Uniform("movie_texture",0));
stateset->setAttribute(program);
}
for(int i=1;i<arguments.argc();++i)
{
if (arguments.isString(i))
@@ -255,9 +290,8 @@ int main(int argc, char** argv)
if (image)
{
geode->addDrawable(createTexturedQuadGeometry(pos,image->s(),image->t(),image));
geode->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
geode->addDrawable(createTexturedQuadGeometry(pos,image->s(),image->t(),image, useTextureRectangle));
pos.z() += image->t()*1.5f;
}
else