void
LogarithmicDepthBuffer::install(osg::Camera* camera)
{
if ( camera && _supported )
{
// install the shader component:
osg::StateSet* stateset = camera->getOrCreateStateSet();
if ( _useFragDepth )
{
stateset->addUniform( new osg::Uniform(C_UNIFORM, (float)NEAR_RES_COEFF) );
}
VirtualProgram* vp = VirtualProgram::getOrCreate( stateset );
Shaders pkg;
if ( _useFragDepth )
{
pkg.loadFunction( vp, pkg.LogDepthBuffer_VertFile );
pkg.loadFunction( vp, pkg.LogDepthBuffer_FragFile );
}
else
{
pkg.loadFunction( vp, pkg.LogDepthBuffer_VertOnly_VertFile );
}
osg::ref_ptr<osg::Camera::DrawCallback> next = camera->getPreDrawCallback();
if ( dynamic_cast<SetFarPlaneUniformCallback*>(next.get()) )
next = static_cast<SetFarPlaneUniformCallback*>(next.get())->_next.get();
stateset->addUniform( _FCUniform.get() );
camera->setPreDrawCallback( new SetFarPlaneUniformCallback(_FCUniform.get(), next.get()) );
}
}
void
BumpMapTerrainEffect::onInstall(TerrainEngineNode* engine)
{
if ( engine && _bumpMapTex.valid() )
{
osg::StateSet* stateset = engine->getTerrainStateSet();
// install the NormalMap texture array:
if ( engine->getResources()->reserveTextureImageUnit(_bumpMapUnit, "BumpMap") )
{
// NormalMap sampler
_bumpMapTexUniform = stateset->getOrCreateUniform(BUMP_SAMPLER, osg::Uniform::SAMPLER_2D);
_bumpMapTexUniform->set( _bumpMapUnit );
stateset->setTextureAttribute( _bumpMapUnit, _bumpMapTex.get(), osg::StateAttribute::ON );
// configure shaders
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
Shaders package;
package.define( "OE_USE_NORMAL_MAP", engine->normalTexturesRequired() );
package.loadFunction( vp, package.VertexModel );
package.loadFunction( vp, package.VertexView );
package.loadFunction( vp, _octaves <= 1? package.FragmentSimple : package.FragmentProgressive );
if ( _octaves > 1 )
stateset->addUniform(new osg::Uniform("oe_bumpmap_octaves", _octaves));
stateset->addUniform(new osg::Uniform("oe_bumpmap_maxRange", _maxRange));
stateset->addUniform( _scaleUniform.get() );
stateset->addUniform( _intensityUniform.get() );
}
}
}
void
DepthOffsetAdapter::setGraph(osg::Node* graph)
{
if ( !_supported ) return;
bool graphChanging =
_graph.get() != graph;
bool uninstall =
(_graph.valid() && _graph->getStateSet()) &&
(graphChanging || (_options.enabled() == false));
bool install =
(graph && graphChanging ) ||
(graph && (_options.enabled() == true));
// shader package:
Shaders shaders;
if ( uninstall )
{
OE_TEST << LC << "Removing depth offset shaders" << std::endl;
// uninstall uniforms and shaders.
osg::StateSet* s = _graph->getStateSet();
s->removeUniform( _minBiasUniform.get() );
s->removeUniform( _maxBiasUniform.get() );
s->removeUniform( _minRangeUniform.get() );
s->removeUniform( _maxRangeUniform.get() );
shaders.unloadFunction( VirtualProgram::get(s), shaders.DepthOffsetVertex );
}
if ( install )
{
OE_TEST << LC << "Installing depth offset shaders" << std::endl;
// install uniforms and shaders.
osg::StateSet* s = graph->getOrCreateStateSet();
s->addUniform( _minBiasUniform.get() );
s->addUniform( _maxBiasUniform.get() );
s->addUniform( _minRangeUniform.get() );
s->addUniform( _maxRangeUniform.get() );
shaders.loadFunction(VirtualProgram::getOrCreate(s), shaders.DepthOffsetVertex);
}
if ( graphChanging )
{
_graph = graph;
}
// always set Dirty when setGraph is called sine it may be called anytime
// the subgraph changes (as can be detected by a computeBound)
_dirty = (_options.automatic() == true);
}
void
NormalMapTerrainEffect::onInstall(TerrainEngineNode* engine)
{
if ( engine )
{
engine->requireNormalTextures();
engine->getResources()->reserveTextureImageUnit(_normalMapUnit, "NormalMap");
engine->addTileNodeCallback( new NormalTexInstaller(this, _normalMapUnit) );
// shader components
osg::StateSet* stateset = engine->getTerrainStateSet();
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
// configure shaders
Shaders package;
package.loadFunction( vp, package.Vertex );
package.loadFunction( vp, package.Fragment );
stateset->addUniform( new osg::Uniform(NORMAL_SAMPLER, _normalMapUnit) );
}
}
void
GraticuleTerrainEffect::onInstall(TerrainEngineNode* engine)
{
if ( engine )
{
// shader components
osg::StateSet* stateset = engine->getTerrainStateSet();
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
// configure shaders
Shaders package;
package.loadFunction( vp, package.Graticule_Vertex );
package.loadFunction( vp, package.Graticule_Fragment);
stateset->addUniform( new osg::Uniform(
GraticuleOptions::resolutionUniformName(), 10.0/180.0) );
stateset->addUniform( new osg::Uniform(
GraticuleOptions::colorUniformName(), _options.color().get()) );
stateset->addUniform( new osg::Uniform(
GraticuleOptions::lineWidthUniformName(), _options.lineWidth().get()) );
}
}
// Generates the main shader code for rendering the terrain.
void
MPTerrainEngineNode::updateState()
{
if ( _batchUpdateInProgress )
{
_stateUpdateRequired = true;
}
else
{
if ( _elevationTextureUnit < 0 && elevationTexturesRequired() )
{
getResources()->reserveTextureImageUnit( _elevationTextureUnit, "MP Engine Elevation" );
}
osg::StateSet* terrainStateSet = getTerrainStateSet();
// required for multipass tile rendering to work
terrainStateSet->setAttributeAndModes(
new osg::Depth(osg::Depth::LEQUAL, 0, 1, true) );
// activate standard mix blending.
terrainStateSet->setAttributeAndModes(
new osg::BlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA),
osg::StateAttribute::ON );
// install shaders, if we're using them.
if ( Registry::capabilities().supportsGLSL() )
{
VirtualProgram* vp = new VirtualProgram();
vp->setName( "osgEarth.engine_mp.TerrainNode" );
terrainStateSet->setAttributeAndModes( vp, osg::StateAttribute::ON );
// bind the vertex attributes generated by the tile compiler.
vp->addBindAttribLocation( "oe_terrain_attr", osg::Drawable::ATTRIBUTE_6 );
vp->addBindAttribLocation( "oe_terrain_attr2", osg::Drawable::ATTRIBUTE_7 );
Shaders package;
package.replace( "$MP_PRIMARY_UNIT", Stringify() << _primaryUnit );
package.replace( "$MP_SECONDARY_UNIT", Stringify() << (_secondaryUnit>=0?_secondaryUnit:0) );
package.define( "MP_USE_BLENDING", (_terrainOptions.enableBlending() == true) );
package.loadFunction( vp, package.VertexModel );
package.loadFunction( vp, package.VertexView );
package.loadFunction( vp, package.Fragment );
// terrain background color; negative means use the vertex color.
Color terrainColor = _terrainOptions.color().getOrUse( Color(1,1,1,-1) );
terrainStateSet->addUniform(new osg::Uniform("oe_terrain_color", terrainColor));
// assemble color filter code snippets.
bool haveColorFilters = false;
{
// Color filter frag function:
std::string fs_colorfilters =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"uniform int oe_layer_uid; \n"
"$COLOR_FILTER_HEAD"
"void oe_mp_apply_filters(inout vec4 color) \n"
"{ \n"
"$COLOR_FILTER_BODY"
"} \n";
std::stringstream cf_head;
std::stringstream cf_body;
const char* I = " ";
// second, install the per-layer color filter functions AND shared layer bindings.
bool ifStarted = false;
int numImageLayers = _update_mapf->imageLayers().size();
for( int i=0; i<numImageLayers; ++i )
{
ImageLayer* layer = _update_mapf->getImageLayerAt(i);
if ( layer->getEnabled() )
{
// install Color Filter function calls:
const ColorFilterChain& chain = layer->getColorFilters();
if ( chain.size() > 0 )
{
haveColorFilters = true;
if ( ifStarted ) cf_body << I << "else if ";
else cf_body << I << "if ";
cf_body << "(oe_layer_uid == " << layer->getUID() << ") {\n";
for( ColorFilterChain::const_iterator j = chain.begin(); j != chain.end(); ++j )
{
const ColorFilter* filter = j->get();
cf_head << "void " << filter->getEntryPointFunctionName() << "(inout vec4 color);\n";
cf_body << I << I << filter->getEntryPointFunctionName() << "(color);\n";
filter->install( terrainStateSet );
}
cf_body << I << "}\n";
ifStarted = true;
}
}
}
if ( haveColorFilters )
{
std::string cf_head_str, cf_body_str;
cf_head_str = cf_head.str();
cf_body_str = cf_body.str();
replaceIn( fs_colorfilters, "$COLOR_FILTER_HEAD", cf_head_str );
replaceIn( fs_colorfilters, "$COLOR_FILTER_BODY", cf_body_str );
vp->setFunction(
"oe_mp_apply_filters",
fs_colorfilters,
ShaderComp::LOCATION_FRAGMENT_COLORING,
0.5f );
}
}
// binding for the terrain texture
terrainStateSet->getOrCreateUniform(
"oe_layer_tex", osg::Uniform::SAMPLER_2D )->set( _primaryUnit );
// binding for the secondary texture (for LOD blending)
if ( parentTexturesRequired() )
{
terrainStateSet->getOrCreateUniform(
"oe_layer_tex_parent", osg::Uniform::SAMPLER_2D )->set( _secondaryUnit );
// binding for the default secondary texture matrix
osg::Matrixf parent_mat;
parent_mat(0,0) = 0.0f;
terrainStateSet->getOrCreateUniform(
"oe_layer_parent_matrix", osg::Uniform::FLOAT_MAT4 )->set( parent_mat );
}
// uniform for accessing the elevation texture sampler.
if ( elevationTexturesRequired() )
{
terrainStateSet->getOrCreateUniform(
"oe_terrain_tex", osg::Uniform::SAMPLER_2D)->set( _elevationTextureUnit );
}
// uniform that controls per-layer opacity
terrainStateSet->getOrCreateUniform(
"oe_layer_opacity", osg::Uniform::FLOAT )->set( 1.0f );
// uniform that conveys the layer UID to the shaders; necessary
// for per-layer branching (like color filters)
// UID -1 => no image layer (no texture)
terrainStateSet->getOrCreateUniform(
"oe_layer_uid", osg::Uniform::INT )->set( -1 );
// uniform that conveys the render order, since the shaders
// need to know which is the first layer in order to blend properly
terrainStateSet->getOrCreateUniform(
"oe_layer_order", osg::Uniform::INT )->set( 0 );
// default min/max range uniforms. (max < min means ranges are disabled)
terrainStateSet->addUniform( new osg::Uniform("oe_layer_minRange", 0.0f) );
terrainStateSet->addUniform( new osg::Uniform("oe_layer_maxRange", -1.0f) );
terrainStateSet->getOrCreateUniform(
"oe_min_tile_range_factor",
osg::Uniform::FLOAT)->set( *_terrainOptions.minTileRangeFactor() );
// special object ID that denotes the terrain surface.
terrainStateSet->addUniform( new osg::Uniform(
Registry::objectIndex()->getObjectIDUniformName().c_str(), OSGEARTH_OBJECTID_TERRAIN) );
}
_stateUpdateRequired = false;
}
}
void
DrapingTechnique::setUpCamera(OverlayDecorator::TechRTTParams& params)
{
// create the projected texture:
osg::Texture2D* projTexture = new osg::Texture2D();
projTexture->setTextureSize( *_textureSize, *_textureSize );
projTexture->setInternalFormat( GL_RGBA );
projTexture->setSourceFormat( GL_RGBA );
projTexture->setSourceType( GL_UNSIGNED_BYTE );
projTexture->setFilter( osg::Texture::MIN_FILTER, _mipmapping? osg::Texture::LINEAR_MIPMAP_LINEAR: osg::Texture::LINEAR );
projTexture->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
projTexture->setWrap( osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_BORDER );
projTexture->setWrap( osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_BORDER );
//projTexture->setWrap( osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE );
projTexture->setBorderColor( osg::Vec4(0,0,0,0) );
// set up the RTT camera:
params._rttCamera = new osg::Camera();
params._rttCamera->setClearColor( osg::Vec4f(0,0,0,0) );
// this ref frame causes the RTT to inherit its viewpoint from above (in order to properly
// process PagedLOD's etc. -- it doesn't affect the perspective of the RTT camera though)
params._rttCamera->setReferenceFrame( osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT );
params._rttCamera->setViewport( 0, 0, *_textureSize, *_textureSize );
params._rttCamera->setComputeNearFarMode( osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR );
params._rttCamera->setRenderOrder( osg::Camera::PRE_RENDER );
params._rttCamera->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT );
params._rttCamera->setImplicitBufferAttachmentMask(0, 0);
params._rttCamera->attach( osg::Camera::COLOR_BUFFER0, projTexture, 0, 0, _mipmapping );
if ( _attachStencil )
{
OE_INFO << LC << "Attaching a stencil buffer to the RTT camera" << std::endl;
// try a depth-packed buffer. failing that, try a normal one.. if the FBO doesn't support
// that (which is doesn't on some GPUs like Intel), it will automatically fall back on
// a PBUFFER_RTT impl
if ( Registry::capabilities().supportsDepthPackedStencilBuffer() )
{
#ifdef OSG_GLES2_AVAILABLE
params._rttCamera->attach( osg::Camera::PACKED_DEPTH_STENCIL_BUFFER, GL_DEPTH24_STENCIL8_EXT );
#else
params._rttCamera->attach( osg::Camera::PACKED_DEPTH_STENCIL_BUFFER, GL_DEPTH_STENCIL_EXT );
#endif
}
else
{
params._rttCamera->attach( osg::Camera::STENCIL_BUFFER, GL_STENCIL_INDEX );
}
params._rttCamera->setClearStencil( 0 );
params._rttCamera->setClearMask( GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT ); //GL_DEPTH_BUFFER_BIT | );
}
else
{
params._rttCamera->setClearMask( GL_COLOR_BUFFER_BIT ); //| GL_DEPTH_BUFFER_BIT );
}
// set up a StateSet for the RTT camera.
osg::StateSet* rttStateSet = params._rttCamera->getOrCreateStateSet();
// lighting is off. We don't want draped items to be lit.
rttStateSet->setMode( GL_LIGHTING, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED );
// install a new default shader program that replaces anything from above.
VirtualProgram* rtt_vp = VirtualProgram::getOrCreate(rttStateSet);
rtt_vp->setName( "DrapingTechnique RTT" );
rtt_vp->setInheritShaders( false );
// activate blending within the RTT camera's FBO
if ( _rttBlending )
{
//Setup a separate blend function for the alpha components and the RGB components.
//Because the destination alpha is initialized to 0 instead of 1
osg::BlendFunc* blendFunc = 0;
if (Registry::capabilities().supportsGLSL(140u))
{
//Blend Func Separate is only available on OpenGL 1.4 and above
blendFunc = new osg::BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
else
{
blendFunc = new osg::BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
rttStateSet->setAttributeAndModes(blendFunc, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
}
else
{
rttStateSet->setMode(GL_BLEND, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
}
// attach the overlay group to the camera.
// TODO: we should probably lock this since other cull traversals might be accessing the group
// while we are changing its children.
params._rttCamera->addChild( params._group );
// overlay geometry is rendered with no depth testing, and in the order it's found in the
// scene graph... until further notice.
rttStateSet->setMode(GL_DEPTH_TEST, 0);
rttStateSet->setBinName( "TraversalOrderBin" );
// add to the terrain stateset, i.e. the stateset that the OverlayDecorator will
// apply to the terrain before cull-traversing it. This will activate the projective
// texturing on the terrain.
params._terrainStateSet->setTextureAttributeAndModes( *_textureUnit, projTexture, osg::StateAttribute::ON );
// fire up the local per-view data:
LocalPerViewData* local = new LocalPerViewData();
params._techniqueData = local;
// Assemble the terrain shaders that will apply projective texturing.
VirtualProgram* terrain_vp = VirtualProgram::getOrCreate(params._terrainStateSet);
terrain_vp->setName( "DrapingTechnique terrain shaders");
// sampler for projected texture:
params._terrainStateSet->getOrCreateUniform(
"oe_overlay_tex", osg::Uniform::SAMPLER_2D )->set( *_textureUnit );
// the texture projection matrix uniform.
local->_texGenUniform = params._terrainStateSet->getOrCreateUniform(
"oe_overlay_texmatrix", osg::Uniform::FLOAT_MAT4 );
// shaders
Shaders pkg;
pkg.loadFunction( terrain_vp, pkg.DrapingVertex );
pkg.loadFunction( terrain_vp, pkg.DrapingFragment );
}