makVrv::DtOsgShaderUtils Class Reference

Static Public Member Functions
static std::string	loadShaderSource (const std::string &strFileName)
	Loads shader source code from a file.
static void	saveShaderSource (const std::string &strFileName, const std::string &strSource)
	Saves shader source code to a file.
static std::string	fixVersionDirective (const std::string &shaderString)
static unsigned	getNumGPUTextureImageUnits ()
	Query the number of available texture image units for shader samplers.
static void	bindSingleAttribute (int shader, const std::string &uniName, bool value, void *hashPtr)
	attaches a single attribute to a opengl uniform.
static void	bindAttributes (osg::Node *node, int shader, int contextID)
	Loop over the uniforms of the stateset of the node and attach them to the current opengl active shader.
static bool	getVPShaderVector (osg::StateSet *ss, osg::State &state, unsigned int &shaderHash, std::vector< unsigned int > &vertShaderVector, std::vector< unsigned int > &fragShaderVector)
	Collect all the active osg::Shader objects in the provided State and compile them.
static void	deleteShaders (const std::vector< unsigned int > &shaderVector)
	Loop over the opengl shader ids in the shaderVector and deletes them from opengl.
static bool	compileShader (const char *source, unsigned int shaderType, unsigned int &shaderID)
	Compiles a shader of type shaderType using source.
static void	restoreOpenGLMode (osg::State &state, int stateToSet)
static void	restoreOpenGLStateAttribute (osg::State &state, osg::StateAttribute::Type type)
static void	restoreOpenGLProgram (osg::State &state)
static void	restoreOpenGLFBO (osg::State &state)
static void	markAllTextureAttributesDirty (osg::State &state)
static void	generateModelInstanceShaders (osg::Node *node, const std::string &shaderName)
	utility function for generating shaders for vrvOsg model instances simpler than the DtOsgShaderManager::generateShaders in that it doesn't share the statesets and just runs the osgEarth::ShaderGenerator on the node.

Static Private Attributes
static ShaderUniLocMap	s_shaderUniLocMap
	used to cache the shader uniform locations to avoid glGetUniformLocation calls Saves somewhere between 1-3ms and reduces variability of frame time with Triton and Silverlining Tried caching the uniform values as well but that did not seem to make a difference.

Member Function Documentation

static std::string makVrv::DtOsgShaderUtils::loadShaderSource ( const std::string &  strFileName )

static

Loads shader source code from a file.

static void makVrv::DtOsgShaderUtils::saveShaderSource ( const std::string &  strFileName, const std::string &  strSource  )

static

Saves shader source code to a file.

static std::string makVrv::DtOsgShaderUtils::fixVersionDirective ( const std::string &  shaderString )

static

static unsigned makVrv::DtOsgShaderUtils::getNumGPUTextureImageUnits ( )

static

Query the number of available texture image units for shader samplers.

static void makVrv::DtOsgShaderUtils::bindSingleAttribute ( int  shader, const std::string &  uniName, bool  value, void *  hashPtr  )

static

attaches a single attribute to a opengl uniform.

static void makVrv::DtOsgShaderUtils::bindAttributes ( osg::Node *  node, int  shader, int  contextID  )

static

Loop over the uniforms of the stateset of the node and attach them to the current opengl active shader.

Also loops over the texture attributes in the stateset and attaches those as well

static bool makVrv::DtOsgShaderUtils::getVPShaderVector ( osg::StateSet *  ss, osg::State &  state, unsigned int &  shaderHash, std::vector< unsigned int > &  vertShaderVector, std::vector< unsigned int > &  fragShaderVector  )

static

Collect all the active osg::Shader objects in the provided State and compile them.

If they compile they are pushed onto shaderVector. shaderVector is cleared in this function so only the shaders from the State are kept. The stateset "ss" is then cleared of an update mark. Returns True if the ss was marked for an update and the shaderVector was modified.

static void makVrv::DtOsgShaderUtils::deleteShaders ( const std::vector< unsigned int > &  shaderVector )

static

Loop over the opengl shader ids in the shaderVector and deletes them from opengl.

static bool makVrv::DtOsgShaderUtils::compileShader ( const char *  source, unsigned int  shaderType, unsigned int &  shaderID  )

static

Compiles a shader of type shaderType using source.

shaderID is the new shader Returns True is the compile succeeded

static void makVrv::DtOsgShaderUtils::restoreOpenGLMode ( osg::State &  state, int  stateToSet  )

static

static void makVrv::DtOsgShaderUtils::restoreOpenGLStateAttribute ( osg::State &  state, osg::StateAttribute::Type  type  )

static

static void makVrv::DtOsgShaderUtils::restoreOpenGLProgram ( osg::State &  state )

static

static void makVrv::DtOsgShaderUtils::restoreOpenGLFBO ( osg::State &  state )

static

static void makVrv::DtOsgShaderUtils::markAllTextureAttributesDirty ( osg::State &  state )

static

static void makVrv::DtOsgShaderUtils::generateModelInstanceShaders ( osg::Node *  node, const std::string &  shaderName  )

static

utility function for generating shaders for vrvOsg model instances simpler than the DtOsgShaderManager::generateShaders in that it doesn't share the statesets and just runs the osgEarth::ShaderGenerator on the node.

This was created solely for the purpose of removing duplicate code for model instances to setup their shaders.

Member Data Documentation

ShaderUniLocMap makVrv::DtOsgShaderUtils::s_shaderUniLocMap

staticprivate

used to cache the shader uniform locations to avoid glGetUniformLocation calls Saves somewhere between 1-3ms and reduces variability of frame time with Triton and Silverlining Tried caching the uniform values as well but that did not seem to make a difference.

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The documentation for this class was generated from the following file:

• /exports/nfedora7-1/nightly/docs/vrforcesDevelopment.tot/include/vrvOsg/DtOsgShaderUtils.h