// Build the stateset necessary for drawing contours.
osg::StateSet* createStateSet( osg::TransferFunction1D* xfer, int unit )
{
osg::StateSet* stateSet = new osg::StateSet();
// Create a 1D texture from the transfer function's image.
osg::Texture* tex = new osg::Texture1D( xfer->getImage() );
tex->setResizeNonPowerOfTwoHint( false );
tex->setFilter( osg::Texture::MIN_FILTER, osg::Texture::LINEAR );
tex->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
tex->setWrap( osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE );
stateSet->setTextureAttributeAndModes( unit, tex, osg::StateAttribute::ON );
// Tell the shader program where to find it.
stateSet->getOrCreateUniform( "contour_colorMap", osg::Uniform::SAMPLER_1D )->set( unit );
// Install the shaders. We also bind osgEarth's elevation data attribute, which the
// terrain engine automatically generates at the specified location.
VirtualProgram* vp = new VirtualProgram();
vp->installDefaultColoringAndLightingShaders();
vp->setFunction( "setupContour", vertexShader, ShaderComp::LOCATION_VERTEX_PRE_LIGHTING );
vp->setFunction( "colorContour", fragmentShader, ShaderComp::LOCATION_FRAGMENT_PRE_LIGHTING );
vp->addBindAttribLocation( "osgearth_elevData", osg::Drawable::ATTRIBUTE_6 );
stateSet->setAttributeAndModes( vp, osg::StateAttribute::ON );
// Install some uniforms that tell the shader the height range of the color map.
stateSet->getOrCreateUniform( "contour_xferMin", osg::Uniform::FLOAT )->set( xfer->getMinimum() );
stateSet->getOrCreateUniform( "contour_xferRange", osg::Uniform::FLOAT )->set( xfer->getMaximum() - xfer->getMinimum() );
return stateSet;
};
// Build the stateset necessary for scaling elevation data.
osg::StateSet* createStateSet()
{
osg::StateSet* stateSet = new osg::StateSet();
// Install the shaders. We also bind osgEarth's elevation data attribute, which the
// terrain engine automatically generates at the specified location.
VirtualProgram* vp = new VirtualProgram();
vp->setFunction( "applyVerticalScale", vertexShader, ShaderComp::LOCATION_VERTEX_MODEL );
vp->addBindAttribLocation( "osgearth_elevData", osg::Drawable::ATTRIBUTE_6 );
stateSet->setAttributeAndModes( vp, osg::StateAttribute::ON );
return stateSet;
};
void configure(int slot, unsigned numInstances)
{
_slot = slot;
_numInstances = numInstances;
osg::StateSet* ss = getOrCreateStateSet();
_xfb->resizeArray( numInstances );
VirtualProgram* vp = VirtualProgram::get(ss);
vp->removeBindAttribLocation( "xfb_position" );
vp->addBindAttribLocation( "xfb_position", _slot );
ss->setAttribute( new osg::VertexAttribDivisor(_slot, 1) );
_drawCallback = new InstanceDrawCallback();
Setup setup(this);
this->accept( setup );
}
// 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;
}
}
// Generates the main shader code for rendering the terrain.
void
MPTerrainEngineNode::updateState()
{
if ( _batchUpdateInProgress )
{
_stateUpdateRequired = true;
}
else
{
osg::StateSet* terrainStateSet = _terrain->getOrCreateStateSet();
// 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 );
// Vertex shader:
std::string vs = Stringify() <<
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"varying vec4 oe_layer_texc;\n"
"varying vec4 oe_layer_tilec;\n"
"void oe_mp_setup_coloring(inout vec4 VertexModel) \n"
"{ \n"
" oe_layer_texc = gl_MultiTexCoord" << _primaryUnit << ";\n"
" oe_layer_tilec = gl_MultiTexCoord" << _secondaryUnit << ";\n"
"}\n";
bool useTerrainColor = _terrainOptions.color().isSet();
bool useBlending = _terrainOptions.enableBlending() == true;
// Fragment Shader for normal blending:
std::string fs = Stringify() <<
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"varying vec4 oe_layer_texc; \n"
"uniform sampler2D oe_layer_tex; \n"
"uniform int oe_layer_uid; \n"
"uniform int oe_layer_order; \n"
"uniform float oe_layer_opacity; \n"
<< (useTerrainColor ?
"uniform vec4 oe_terrain_color; \n" : ""
) <<
"void oe_mp_apply_coloring(inout vec4 color) \n"
"{ \n"
<< (useTerrainColor ?
" color = oe_terrain_color; \n" : ""
) <<
//" color = vec4(1,1,1,1); \n"
" vec4 texel; \n"
" if ( oe_layer_uid >= 0 ) { \n"
" texel = texture2D(oe_layer_tex, oe_layer_texc.st); \n"
" texel.a *= oe_layer_opacity; \n"
" } \n"
" else \n"
" texel = color; \n"
" "
<< (useBlending ?
" if ( oe_layer_order == 0 ) \n"
" color = texel*texel.a + color*(1.0-texel.a); \n" // simulate src_alpha, 1-src_alpha blens
" else \n" : ""
) <<
" color = texel; \n"
"} \n";
// 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";
vp->setFunction( "oe_mp_setup_coloring", vs, ShaderComp::LOCATION_VERTEX_MODEL, 0.0 );
vp->setFunction( "oe_mp_apply_coloring", fs, ShaderComp::LOCATION_FRAGMENT_COLORING, 0.0 );
// assemble color filter code snippets.
bool haveColorFilters = false;
{
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, 0.0 );
}
}
// binding for the terrain texture
terrainStateSet->getOrCreateUniform(
"oe_layer_tex", osg::Uniform::SAMPLER_2D )->set( _primaryUnit );
// binding for the secondary texture (for LOD blending)
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 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 );
// base terrain color.
if ( useTerrainColor )
{
terrainStateSet->getOrCreateUniform(
"oe_terrain_color", osg::Uniform::FLOAT_VEC4 )->set( *_terrainOptions.color() );
}
}
_stateUpdateRequired = false;
}
}
osg::Node*
PolygonizeLinesFilter::push(FeatureList& input, FilterContext& cx)
{
// compute the coordinate localization matrices.
computeLocalizers( cx );
// establish some things
bool makeECEF = false;
const SpatialReference* featureSRS = 0L;
const SpatialReference* mapSRS = 0L;
if ( cx.isGeoreferenced() )
{
makeECEF = cx.getSession()->getMapInfo().isGeocentric();
featureSRS = cx.extent()->getSRS();
mapSRS = cx.getSession()->getMapInfo().getProfile()->getSRS();
}
// The operator we'll use to make lines into polygons.
const LineSymbol* line = _style.get<LineSymbol>();
PolygonizeLinesOperator polygonize( line ? (*line->stroke()) : Stroke() );
// Geode to hold all the geometries.
osg::Geode* geode = new osg::Geode();
// iterate over all features.
for( FeatureList::iterator i = input.begin(); i != input.end(); ++i )
{
Feature* f = i->get();
// iterate over all the feature's geometry parts. We will treat
// them as lines strings.
GeometryIterator parts( f->getGeometry(), false );
while( parts.hasMore() )
{
Geometry* part = parts.next();
// skip empty geometry
if ( part->size() == 0 )
continue;
// transform the geometry into the target SRS and localize it about
// a local reference point.
osg::Vec3Array* verts = new osg::Vec3Array();
osg::Vec3Array* normals = new osg::Vec3Array();
transformAndLocalize( part->asVector(), featureSRS, verts, normals, mapSRS, _world2local, makeECEF );
// turn the lines into polygons.
osg::Geometry* geom = polygonize( verts, normals );
geode->addDrawable( geom );
// record the geometry's primitive set(s) in the index:
if ( cx.featureIndex() )
cx.featureIndex()->tagPrimitiveSets( geom, f );
}
}
// attempt to combine geometries for better performance
MeshConsolidator::run( *geode );
// GPU performance optimization:
VertexCacheOptimizer vco;
geode->accept( vco );
// If we're auto-scaling, we need a shader
float minPixels = line ? line->stroke()->minPixels().getOrUse( 0.0f ) : 0.0f;
if ( minPixels > 0.0f )
{
osg::StateSet* stateSet = geode->getOrCreateStateSet();
VirtualProgram* vp = VirtualProgram::getOrCreate(stateSet);
vp->setName( "osgEarth::PolygonizeLines" );
const char* vs =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"attribute vec3 oe_polyline_center; \n"
"uniform float oe_polyline_scale; \n"
"uniform float oe_polyline_min_pixels; \n"
"uniform mat3 oe_WindowScaleMatrix; \n"
"void oe_polyline_scalelines(inout vec4 VertexMODEL) \n"
"{ \n"
" if ( oe_polyline_scale != 1.0 || oe_polyline_min_pixels > 0.0 ) \n"
" { \n"
" vec4 center_model = vec4(oe_polyline_center*VertexMODEL.w, VertexMODEL.w); \n"
" vec4 vector_model = VertexMODEL - center_model; \n"
" if ( length(vector_model.xyz) > 0.0 ) \n"
" { \n"
" float scale = oe_polyline_scale; \n"
" vec4 vertex_clip = gl_ModelViewProjectionMatrix * VertexMODEL; \n"
" vec4 center_clip = gl_ModelViewProjectionMatrix * center_model; \n"
" vec4 vector_clip = vertex_clip - center_clip; \n"
" if ( oe_polyline_min_pixels > 0.0 ) \n"
" { \n"
" vec3 vector_win = oe_WindowScaleMatrix * (vertex_clip.xyz/vertex_clip.w - center_clip.xyz/center_clip.w); \n"
" float min_scale = max( (0.5*oe_polyline_min_pixels)/length(vector_win.xy), 1.0 ); \n"
" scale = max( scale, min_scale ); \n"
" } \n"
" VertexMODEL = center_model + vector_model*scale; \n"
" } \n"
" } \n"
"} \n";
vp->setFunction( "oe_polyline_scalelines", vs, ShaderComp::LOCATION_VERTEX_MODEL );
vp->addBindAttribLocation( "oe_polyline_center", osg::Drawable::ATTRIBUTE_6 );
// add the default scaling uniform.
// good way to test:
// osgearth_viewer earthfile --uniform oe_polyline_scale 1.0 10.0
osg::Uniform* scaleU = new osg::Uniform(osg::Uniform::FLOAT, "oe_polyline_scale");
scaleU->set( 1.0f );
stateSet->addUniform( scaleU, 1 );
// the default "min pixels" uniform.
osg::Uniform* minPixelsU = new osg::Uniform(osg::Uniform::FLOAT, "oe_polyline_min_pixels");
minPixelsU->set( minPixels );
stateSet->addUniform( minPixelsU, 1 );
}
return delocalize( geode );
}
void makeVisibleVP(osg::StateSet* ss)
{
VirtualProgram* vp = VirtualProgram::getOrCreate(ss);
vp->setFunction("oe_instancing_setPos", IG_VS, ShaderComp::LOCATION_VERTEX_MODEL, -FLT_MAX);
vp->addBindAttribLocation( "xfb_position", XFB_SLOT );
}
void
PolygonizeLinesOperator::installShaders(osg::Node* node) const
{
if ( !node )
return;
float minPixels = _stroke.minPixels().getOrUse( 0.0f );
if ( minPixels <= 0.0f )
return;
osg::StateSet* stateset = node->getOrCreateStateSet();
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
// bail if already installed.
if ( vp->getName().compare( SHADER_NAME ) == 0 )
return;
vp->setName( SHADER_NAME );
const char* vs =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"in vec3 oe_polyline_center; \n"
"uniform float oe_polyline_scale; \n"
"uniform float oe_polyline_min_pixels; \n"
"uniform vec4 oe_PixelSizeVector; \n"
"void oe_polyline_scalelines(inout vec4 vertex_model4) \n"
"{ \n"
" const float epsilon = 0.0001; \n"
" vec4 center = vec4(oe_polyline_center, 1.0); \n"
" vec3 vector = vertex_model4.xyz - center.xyz; \n"
" float r = length(vector); \n"
" float activate = step(epsilon, r*oe_polyline_min_pixels);\n"
" float pixelSize = max(epsilon, 2.0*abs(r/dot(center, oe_PixelSizeVector))); \n"
" float min_scale = max(oe_polyline_min_pixels/pixelSize, 1.0); \n"
" float scale = mix(1.0, max(oe_polyline_scale, min_scale), activate); \n"
" vertex_model4.xyz = center.xyz + vector*scale; \n"
"} \n";
vp->setFunction( "oe_polyline_scalelines", vs, ShaderComp::LOCATION_VERTEX_MODEL, 0.5f );
vp->addBindAttribLocation( "oe_polyline_center", ATTR_LOCATION );
// add the default scaling uniform.
// good way to test:
// osgearth_viewer earthfile --uniform oe_polyline_scale 1.0 10.0
osg::Uniform* scaleU = new osg::Uniform(osg::Uniform::FLOAT, "oe_polyline_scale");
scaleU->set( 1.0f );
stateset->addUniform( scaleU, 1 );
// the default "min pixels" uniform.
osg::Uniform* minPixelsU = new osg::Uniform(osg::Uniform::FLOAT, "oe_polyline_min_pixels");
minPixelsU->set( minPixels );
stateset->addUniform( minPixelsU, 1 );
// this will install and update the oe_PixelSizeVector uniform.
node->addCullCallback( new PixelSizeVectorCullCallback(stateset) );
}
// Generates the main shader code for rendering the terrain.
void
MPTerrainEngineNode::updateShaders()
{
if ( _batchUpdateInProgress )
{
_shaderUpdateRequired = true;
}
else
{
osg::StateSet* terrainStateSet = _terrain->getOrCreateStateSet();
VirtualProgram* vp = new VirtualProgram();
vp->setName( "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 );
// Vertex shader template:
std::string vs =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"varying vec4 oe_layer_texc;\n"
"varying vec4 oe_layer_tilec;\n"
"void oe_mp_setup_coloring(inout vec4 VertexModel) \n"
"{ \n"
" oe_layer_texc = __GL_MULTITEXCOORD1__;\n"
" oe_layer_tilec = __GL_MULTITEXCOORD2__;\n"
"}\n";
// Fragment shader for normal blending:
std::string fs =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"varying vec4 oe_layer_texc; \n"
"uniform sampler2D oe_layer_tex; \n"
"uniform int oe_layer_uid; \n"
"uniform int oe_layer_order; \n"
"uniform float oe_layer_opacity; \n"
"void oe_mp_apply_coloring( inout vec4 color ) \n"
"{ \n"
" vec4 texel; \n"
" if ( oe_layer_uid >= 0 ) { \n"
" texel = texture2D(oe_layer_tex, oe_layer_texc.st); \n"
" texel.a *= oe_layer_opacity; \n"
" } \n"
" else \n"
" texel = color; \n"
" if (oe_layer_order == 0 ) \n"
" color = texel*texel.a + color*(1.0-texel.a); \n" // simulate src_alpha, 1-src_alpha blens
" else \n"
" color = texel; \n"
"} \n";
// Fragment shader with pre-multiplied alpha blending:
std::string fs_pma =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"varying vec4 oe_layer_texc; \n"
"uniform sampler2D oe_layer_tex; \n"
"uniform int oe_layer_uid; \n"
"uniform int oe_layer_order; \n"
"uniform float oe_layer_opacity; \n"
"void oe_mp_apply_coloring_pma( inout vec4 color ) \n"
"{ \n"
" vec4 texelpma; \n"
// a UID < 0 means no texture.
" if ( oe_layer_uid >= 0 ) \n"
" texelpma = texture2D(oe_layer_tex, oe_layer_texc.st) * oe_layer_opacity; \n"
" else \n"
" texelpma = color * color.a * oe_layer_opacity; \n" // to PMA.
// first layer must PMA-blend with the globe color.
" if (oe_layer_order == 0) { \n"
" color.rgb *= color.a; \n"
" color = texelpma + color*(1.0-texelpma.a); \n" // simulate one, 1-src_alpha blend
" } \n"
" else { \n"
" color = texelpma; \n"
" } \n"
"} \n";
// 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";
// install the gl_MultiTexCoord* variable that uses the proper texture
// image unit:
replaceIn( vs, "__GL_MULTITEXCOORD1__", Stringify() << "gl_MultiTexCoord" << _primaryUnit );
replaceIn( vs, "__GL_MULTITEXCOORD2__", Stringify() << "gl_MultiTexCoord" << _secondaryUnit );
vp->setFunction( "oe_mp_setup_coloring", vs, ShaderComp::LOCATION_VERTEX_MODEL, 0.0 );
if ( _terrainOptions.premultipliedAlpha() == true )
vp->setFunction( "oe_mp_apply_coloring_pma", fs_pma, ShaderComp::LOCATION_FRAGMENT_COLORING, 0.0 );
else
vp->setFunction( "oe_mp_apply_coloring", fs, ShaderComp::LOCATION_FRAGMENT_COLORING, 0.0 );
// assemble color filter code snippets.
bool haveColorFilters = false;
{
std::stringstream cf_head;
std::stringstream cf_body;
const char* I = " ";
if ( _terrainOptions.premultipliedAlpha() == true )
{
// un-PMA the color before passing it to the color filters.
cf_body << I << "if (color.a > 0.0) color.rgb /= color.a; \n";
}
// 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 ( _terrainOptions.premultipliedAlpha() == true )
{
// re-PMA the color after it passes through the color filters.
cf_body << I << "color.rgb *= color.a; \n";
}
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, 0.0 );
}
}
if ( _terrainOptions.premultipliedAlpha() == true )
{
// activate PMA blending.
terrainStateSet->setAttributeAndModes(
new osg::BlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA),
osg::StateAttribute::ON );
}
else
{
// activate standard mix blending.
terrainStateSet->setAttributeAndModes(
new osg::BlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA),
osg::StateAttribute::ON );
}
// required for multipass tile rendering to work
terrainStateSet->setAttributeAndModes(
new osg::Depth(osg::Depth::LEQUAL, 0, 1, true) );
// binding for the terrain texture
terrainStateSet->getOrCreateUniform(
"oe_layer_tex", osg::Uniform::SAMPLER_2D )->set( _primaryUnit );
// binding for the secondary texture (for LOD blending)
terrainStateSet->getOrCreateUniform(
"oe_layer_tex_parent", osg::Uniform::SAMPLER_2D )->set( _secondaryUnit );
// 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 );
_shaderUpdateRequired = false;
}
}
void
ClampingTechnique::setUpCamera(OverlayDecorator::TechRTTParams& params)
{
// To store technique-specific per-view info:
LocalPerViewData* local = new LocalPerViewData();
params._techniqueData = local;
// create the projected texture:
local->_rttTexture = new osg::Texture2D();
local->_rttTexture->setTextureSize( *_textureSize, *_textureSize );
local->_rttTexture->setInternalFormat( GL_DEPTH_COMPONENT );
local->_rttTexture->setFilter( osg::Texture::MIN_FILTER, osg::Texture::NEAREST );
local->_rttTexture->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
// this is important. geometry that is outside the depth texture will clamp to the
// closest edge value in the texture -- this is good when you are rendering a
// primitive that has one or more of its verts off-screen.
local->_rttTexture->setWrap( osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE );
local->_rttTexture->setWrap( osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE );
//local->_rttTexture->setBorderColor( osg::Vec4(0,0,0,1) );
// set up the RTT camera:
params._rttCamera = new osg::Camera();
params._rttCamera->setName("GPU Clamping");
params._rttCamera->setReferenceFrame( osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT );
params._rttCamera->setClearDepth( 1.0 );
params._rttCamera->setClearMask( GL_DEPTH_BUFFER_BIT );
params._rttCamera->setComputeNearFarMode( osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR );
params._rttCamera->setViewport( 0, 0, *_textureSize, *_textureSize );
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::DEPTH_BUFFER, local->_rttTexture.get() );
#ifdef DUMP_RTT_IMAGE
local->_rttDebugImage = new osg::Image();
local->_rttDebugImage->allocateImage(4096, 4096, 1, GL_RGB, GL_UNSIGNED_BYTE);
memset( (void*)local->_rttDebugImage->getDataPointer(), 0xff, local->_rttDebugImage->getTotalSizeInBytes() );
params._rttCamera->attach( osg::Camera::COLOR_BUFFER, local->_rttDebugImage.get() );
params._rttCamera->setFinalDrawCallback( new DumpTex(local->_rttDebugImage.get()) );
#endif
#ifdef TIME_RTT_CAMERA
params._rttCamera->setInitialDrawCallback( new RttIn() );
params._rttCamera->setFinalDrawCallback( new RttOut() );
#endif
// set up a StateSet for the RTT camera.
osg::StateSet* rttStateSet = params._rttCamera->getOrCreateStateSet();
rttStateSet->setMode(
GL_BLEND,
osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
// prevents wireframe mode in the depth camera.
rttStateSet->setAttributeAndModes(
new osg::PolygonMode( osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::FILL ),
osg::StateAttribute::ON | osg::StateAttribute::PROTECTED );
// install a VP on the stateset that cancels out any higher-up VP code.
// This will prevent things like VPs on the main camera (e.g., log depth buffer)
// from interfering with the depth camera
VirtualProgram* rttVP = VirtualProgram::getOrCreate(rttStateSet);
rttVP->setInheritShaders(false);
// attach the terrain to the camera.
// todo: should probably protect this with a mutex.....
params._rttCamera->addChild( _engine ); // the terrain itself.
// assemble the overlay graph stateset.
local->_groupStateSet = new osg::StateSet();
// Required for now, otherwise GPU-clamped geometry will jitter sometimes.
// TODO: figure out why and fix it. This is a workaround for now.
local->_groupStateSet->setDataVariance( osg::Object::DYNAMIC );
local->_groupStateSet->setTextureAttributeAndModes(
_textureUnit,
local->_rttTexture.get(),
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE );
// set up depth test/write parameters for the overlay geometry:
local->_groupStateSet->setAttributeAndModes(
new osg::Depth( osg::Depth::LEQUAL, 0.0, 1.0, true ),
osg::StateAttribute::ON );
local->_groupStateSet->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
// uniform for the horizon distance (== max clamping distance)
local->_horizonDistance2Uniform = local->_groupStateSet->getOrCreateUniform(
"oe_clamp_horizonDistance2",
osg::Uniform::FLOAT );
// sampler for depth map texture:
local->_groupStateSet->getOrCreateUniform(
"oe_clamp_depthTex",
osg::Uniform::SAMPLER_2D )->set( _textureUnit );
// matrix that transforms a vert from EYE coords to the depth camera's CLIP coord.
local->_camViewToDepthClipUniform = local->_groupStateSet->getOrCreateUniform(
"oe_clamp_cameraView2depthClip",
osg::Uniform::FLOAT_MAT4 );
#ifdef SUPPORT_Z
// matrix that transforms a vert from depth clip coords to depth view coords.
local->_depthClipToDepthViewUniform = local->_groupStateSet->getOrCreateUniform(
"oe_clamp_depthClip2depthView",
osg::Uniform::FLOAT_MAT4 );
// matrix that transforms a vert from depth view coords to camera view coords.
local->_depthViewToCamViewUniform = local->_groupStateSet->getOrCreateUniform(
"oe_clamp_depthView2cameraView",
osg::Uniform::FLOAT_MAT4 );
#else
// matrix that transforms a vert from depth-cam CLIP coords to EYE coords.
local->_depthClipToCamViewUniform = local->_groupStateSet->getOrCreateUniform(
"oe_clamp_depthClip2cameraView",
osg::Uniform::FLOAT_MAT4 );
#endif
// default value for altitude offset; can be overriden by geometry.
local->_groupStateSet->addUniform( new osg::Uniform(Clamping::AltitudeOffsetUniformName, 0.0f) );
// make the shader that will do clamping and depth offsetting.
VirtualProgram* vp = VirtualProgram::getOrCreate(local->_groupStateSet.get());
vp->setName( "GPUClamping" );
// Bind clamping attribute location, and a default uniform indicating whether
// they are available (default is false).
vp->addBindAttribLocation( Clamping::AnchorAttrName, Clamping::AnchorAttrLocation );
local->_groupStateSet->addUniform( new osg::Uniform(Clamping::HasAttrsUniformName, false) );
// Bind clamping heights location.
vp->addBindAttribLocation( Clamping::HeightsAttrName, Clamping::HeightsAttrLocation );
osgEarth::Shaders pkg;
pkg.load(vp, pkg.GPUClampingVertex);
pkg.load(vp, pkg.GPUClampingFragment);
}