FadeLOD::FadeLOD() :
_minPixelExtent( 0.0f ),
_maxPixelExtent( FLT_MAX ),
_minFadeExtent ( 0.0f ),
_maxFadeExtent ( 0.0f )
{
if ( Registry::capabilities().supportsGLSL() )
{
VirtualProgram* vp = new VirtualProgram();
vp->setFunction(
"oe_fragFadeLOD",
FadeLODFragmentShader,
ShaderComp::LOCATION_FRAGMENT_COLORING );
osg::StateSet* ss = getOrCreateStateSet();
ss->setAttributeAndModes( vp, osg::StateAttribute::ON );
}
}
osg::Group* run(osg::Node* node)
{
float radius = osgEarth::SpatialReference::get("wgs84")->getEllipsoid()->getRadiusEquator();
VirtualProgram* vp = VirtualProgram::getOrCreate(node->getOrCreateStateSet());
// Install the shader function:
vp->setFunction("make_it_red", fragShader, ShaderComp::LOCATION_FRAGMENT_LIGHTING);
// Set a maximum LOD range for the above function:
vp->setFunctionMinRange( "make_it_red", 500000 );
vp->setFunctionMaxRange( "make_it_red", 1000000 );
osg::Group* g = new osg::Group();
// Install a callback that will convey the LOD range to the shader LOD.
g->addCullCallback( new RangeUniformCullCallback() );
g->addChild( node );
return g;
}
void
FeaturesToNodeFilter::applyLineSymbology(osg::StateSet* stateset,
const LineSymbol* line)
{
if ( line && line->stroke().isSet() )
{
if ( line->stroke()->width().isSet() )
{
float width = std::max( 1.0f, *line->stroke()->width() );
if ( width != 1.0f )
{
stateset->setAttributeAndModes(new osg::LineWidth(width), 1);
}
}
if ( line->stroke()->stipplePattern().isSet() )
{
#if 1
stateset->setAttributeAndModes(
new osg::LineStipple(
line->stroke()->stippleFactor().value(),
line->stroke()->stipplePattern().value()),
osg::StateAttribute::ON );
#else
// goofing around...
const char* frag =
"#version 110\n"
"void oe_stipple_frag(inout vec4 color) {\n"
" float x = mod(gl_FragCoord.x, 5.0);\n"
" float y = mod(gl_FragCoord.y, 5.0);\n"
" if (x < y)\n"
" color.a = 0.0;\n"
"}\n";
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
vp->setFunction("oe_stipple_frag", frag, ShaderComp::LOCATION_FRAGMENT_COLORING);
#endif
}
}
}
void
DiscardAlphaFragments::install(osg::StateSet* ss, float minAlpha) const
{
if ( ss && minAlpha < 1.0f && Registry::capabilities().supportsGLSL() )
{
VirtualProgram* vp = VirtualProgram::getOrCreate(ss);
if ( vp )
{
std::string code = Stringify()
<< "#version " GLSL_VERSION_STR "\n"
<< "void oe_discardalpha_frag(inout vec4 color) { \n"
<< " if ( color.a < " << std::setprecision(1) << minAlpha << ") discard;\n"
<< "} \n";
vp->setFunction(
"oe_discardalpha_frag",
code,
ShaderComp::LOCATION_FRAGMENT_COLORING,
0L, 0.95f);
}
}
}
void
ShaderGenerator::apply(osg::ClipNode& node)
{
static const char* s_clip_source =
"#version " GLSL_VERSION_STR "\n"
"void oe_sg_set_clipvertex(inout vec4 vertexVIEW)\n"
"{\n"
" gl_ClipVertex = vertexVIEW; \n"
"}\n";
if ( !_active )
return;
if ( ignore(&node) )
return;
VirtualProgram* vp = VirtualProgram::getOrCreate(node.getOrCreateStateSet());
if ( vp->referenceCount() == 1 ) vp->setName( _name );
vp->setFunction( "oe_sg_set_clipvertex", s_clip_source, ShaderComp::LOCATION_VERTEX_VIEW );
apply( static_cast<osg::Group&>(node) );
}
void traverse(osg::NodeVisitor& nv)
{
if (nv.getVisitorType() == nv.UPDATE_VISITOR)
{
if ( (nv.getFrameStamp()->getFrameNumber() % 2) == 0 )
{
_toggle = !_toggle;
VirtualProgram* vp = VirtualProgram::getOrCreate(this->getOrCreateStateSet());
if ( _toggle )
{
vp->setFunction(
"make_it_red", fragShader,
osgEarth::ShaderComp::LOCATION_FRAGMENT_COLORING,
new Acceptor() );
}
else
{
vp->removeShader("make_it_red");
}
}
}
osg::Group::traverse(nv);
}
bool
HighlightDecoration::apply(AnnotationNode& node, bool enable)
{
if ( _supported )
{
osg::StateSet* ss = node.getOrCreateStateSet();
if ( enable )
{
VirtualProgram* vp = VirtualProgram::getOrCreate( ss );
if ( vp->getShader(FRAG_FUNCTION) == 0L )
{
vp->setFunction(FRAG_FUNCTION, fragSource, ShaderComp::LOCATION_FRAGMENT_COLORING);
ss->addUniform( _colorUniform.get() );
}
_colorUniform->set(_color);
}
else
{
// sets alpha=0 to disable highlighting
_colorUniform->set(osg::Vec4f(1,1,1,0));
}
}
return _supported;
}
void
DrawInstanced::install(osg::StateSet* stateset)
{
if ( !stateset )
return;
// simple vertex program to position a vertex based on its instance
// matrix, which is stored in a texture.
std::string src_vert = Stringify()
<< "#version 120 \n"
<< "#extension GL_EXT_gpu_shader4 : enable \n"
<< "#extension GL_ARB_draw_instanced: enable \n"
<< "uniform sampler2D oe_di_postex; \n"
<< "uniform vec2 oe_di_postex_size; \n"
<< "void oe_di_setInstancePosition(inout vec4 VertexMODEL) \n"
<< "{ \n"
<< " float index = float(4 * gl_InstanceID) / oe_di_postex_size.x; \n"
<< " float s = fract(index); \n"
<< " float t = floor(index)/oe_di_postex_size.y; \n"
<< " float step = 1.0 / oe_di_postex_size.x; \n" // step from one vec4 to the next
<< " vec4 m0 = texture2D(oe_di_postex, vec2(s, t)); \n"
<< " vec4 m1 = texture2D(oe_di_postex, vec2(s+step, t)); \n"
<< " vec4 m2 = texture2D(oe_di_postex, vec2(s+step+step, t)); \n"
<< " vec4 m3 = texture2D(oe_di_postex, vec2(s+step+step+step, t)); \n"
<< " VertexMODEL = VertexMODEL * mat4(m0, m1, m2, m3); \n" // why???
<< "} \n";
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
vp->setFunction(
"oe_di_setInstancePosition",
src_vert,
ShaderComp::LOCATION_VERTEX_MODEL );
stateset->getOrCreateUniform("oe_di_postex", osg::Uniform::SAMPLER_2D)->set(POSTEX_TEXTURE_UNIT);
}
// 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;
}
}
void
OverlayDecorator::initSubgraphShaders( osg::StateSet* set )
{
VirtualProgram* vp = new VirtualProgram();
vp->setName( "OverlayDecorator subgraph shader" );
set->setAttributeAndModes( vp, osg::StateAttribute::ON );
// sampler for projected texture:
set->getOrCreateUniform( "osgearth_overlay_ProjTex", osg::Uniform::SAMPLER_2D )->set( *_textureUnit );
// the texture projection matrix uniform.
_texGenUniform = set->getOrCreateUniform( "osgearth_overlay_TexGenMatrix", osg::Uniform::FLOAT_MAT4 );
std::stringstream buf;
// vertex shader - subgraph
buf << "#version 110 \n"
<< "uniform mat4 osgearth_overlay_TexGenMatrix; \n"
<< "uniform mat4 osg_ViewMatrixInverse; \n"
<< "void osgearth_overlay_vertex(void) \n"
<< "{ \n"
<< " gl_TexCoord["<< *_textureUnit << "] = osgearth_overlay_TexGenMatrix * osg_ViewMatrixInverse * gl_ModelViewMatrix * gl_Vertex; \n"
<< "} \n";
std::string vertexSource = buf.str();
vp->setFunction( "osgearth_overlay_vertex", vertexSource, ShaderComp::LOCATION_VERTEX_POST_LIGHTING );
// fragment shader - subgraph
buf.str("");
buf << "#version 110 \n"
<< "uniform sampler2D osgearth_overlay_ProjTex; \n";
if ( _useWarping )
{
buf << "uniform float warp; \n"
// because the built-in pow() is busted
<< "float mypow( in float x, in float y ) \n"
<< "{ \n"
<< " return x/(x+y-y*x); \n"
<< "} \n"
<< "vec2 warpTexCoord( in vec2 src ) \n"
<< "{ \n"
// incoming tex coord is [0..1], so we scale to [-1..1]
<< " vec2 srcn = vec2( src.x*2.0 - 1.0, src.y*2.0 - 1.0 ); \n"
// we want to work in the [0..1] space on each side of 0, so can the abs
// and store the signs for later:
<< " vec2 srct = vec2( abs(srcn.x), abs(srcn.y) ); \n"
<< " vec2 sign = vec2( srcn.x > 0.0 ? 1.0 : -1.0, srcn.y > 0.0 ? 1.0 : -1.0 ); \n"
// apply the deformation using a deceleration curve:
<< " vec2 srcp = vec2( 1.0-mypow(1.0-srct.x,warp), 1.0-mypow(1.0-srct.y,warp) ); \n"
// reapply the sign, and scale back to [0..1]:
<< " vec2 srcr = vec2( sign.x*srcp.x, sign.y*srcp.y ); \n"
<< " return vec2( 0.5*(srcr.x + 1.0), 0.5*(srcr.y + 1.0) ); \n"
<< "} \n";
}
buf << "void osgearth_overlay_fragment( inout vec4 color ) \n"
<< "{ \n"
<< " vec2 texCoord = gl_TexCoord["<< *_textureUnit << "].xy / gl_TexCoord["<< *_textureUnit << "].q; \n";
if ( _useWarping && !_visualizeWarp )
buf << " texCoord = warpTexCoord( texCoord ); \n";
buf << " vec4 texel = texture2D(osgearth_overlay_ProjTex, texCoord); \n"
<< " color = vec4( mix( color.rgb, texel.rgb, texel.a ), color.a); \n"
<< "} \n";
std::string fragmentSource = buf.str();
vp->setFunction( "osgearth_overlay_fragment", fragmentSource, ShaderComp::LOCATION_FRAGMENT_PRE_LIGHTING );
}
bool
ShadowUtils::setUpShadows(osgShadow::ShadowedScene* sscene, osg::Group* root)
{
osg::StateSet* ssStateSet = sscene->getOrCreateStateSet();
MapNode* mapNode = MapNode::findMapNode(root);
TerrainEngineNode* engine = mapNode->getTerrainEngine();
if (!engine)
return false;
TextureCompositor* compositor = engine->getTextureCompositor();
int su = -1;
if (!compositor->reserveTextureImageUnit(su))
return false;
OE_INFO << LC << "Reserved texture unit " << su << " for shadowing" << std::endl;
osgShadow::ViewDependentShadowMap* vdsm = dynamic_cast< osgShadow::ViewDependentShadowMap*>(sscene->getShadowTechnique());
int su1 = -1;
if (vdsm && sscene->getShadowSettings()->getNumShadowMapsPerLight() == 2)
{
if (!compositor->reserveTextureImageUnit(su1) || su1 != su + 1)
{
OE_FATAL << LC << "couldn't get contiguous shadows for split vdsm\n";
sscene->getShadowSettings()->setNumShadowMapsPerLight(1);
if (su1 != -1)
compositor->releaseTextureImageUnit(su1);
su1 = -1;
}
else
{
OE_INFO << LC << "Reserved texture unit " << su1 << " for shadowing" << std::endl;
}
}
// create a virtual program to attach to the shadowed scene.
VirtualProgram* vp = new VirtualProgram();
vp->setName( "shadow:terrain" );
//vp->installDefaultColoringAndLightingShaders();
ssStateSet->setAttributeAndModes( vp, 1 );
std::stringstream buf;
buf << "#version " << GLSL_VERSION_STR << "\n";
#ifdef OSG_GLES2_AVAILABLE
buf << "precision mediump float;\n";
#endif
buf << "varying vec4 oe_shadow_ambient;\n";
buf << "varying vec4 oe_shadow_TexCoord0;\n";
if ( su1 >= 0 )
buf << "varying vec4 oe_shadow_TexCoord1;\n";
buf << "void oe_shadow_setupShadowCoords(inout vec4 VertexVIEW)\n";
buf << "{\n";
buf << " vec4 position4 = VertexVIEW;\n";
buf << " oe_shadow_TexCoord0.s = dot( position4, gl_EyePlaneS[" << su <<"]);\n";
buf << " oe_shadow_TexCoord0.t = dot( position4, gl_EyePlaneT[" << su <<"]);\n";
buf << " oe_shadow_TexCoord0.p = dot( position4, gl_EyePlaneR[" << su <<"]);\n";
buf << " oe_shadow_TexCoord0.q = dot( position4, gl_EyePlaneQ[" << su <<"]);\n";
if (su1 >= 0)
{
buf << " oe_shadow_TexCoord1.s = dot( position4, gl_EyePlaneS[" << su1 <<"]);\n";
buf << " oe_shadow_TexCoord1.t = dot( position4, gl_EyePlaneT[" << su1 <<"]);\n";
buf << " oe_shadow_TexCoord1.p = dot( position4, gl_EyePlaneR[" << su1 <<"]);\n";
buf << " oe_shadow_TexCoord1.q = dot( position4, gl_EyePlaneQ[" << su1 <<"]);\n";
}
// the ambient lighting will control the intensity of the shadow.
buf << " oe_shadow_ambient = gl_FrontLightProduct[0].ambient; \n"
<< "}\n";
std::string setupShadowCoords;
setupShadowCoords = buf.str();
vp->setFunction(
"oe_shadow_setupShadowCoords",
setupShadowCoords,
ShaderComp::LOCATION_VERTEX_VIEW,
-1.0 );
std::stringstream buf2;
buf2 <<
"#version " << GLSL_VERSION_STR << "\n"
#ifdef OSG_GLES2_AVAILABLE
"precision mediump float;\n"
#endif
"uniform sampler2DShadow shadowTexture;\n"
"varying vec4 oe_shadow_TexCoord0;\n";
if (su1 >= 0)
{
// bound by vdsm
buf2 << "uniform sampler2DShadow shadowTexture1;\n";
buf2 << "varying vec4 oe_shadow_TexCoord1;\n";
}
buf2 <<
"varying vec4 oe_shadow_ambient;\n"
"void oe_shadow_applyLighting( inout vec4 color )\n"
"{\n"
" float alpha = color.a;\n"
" float shadowFac = shadow2DProj( shadowTexture, oe_shadow_TexCoord0).r;\n";
if (su1 > 0)
{
buf2 << " shadowFac *= shadow2DProj( shadowTexture1, oe_shadow_TexCoord1).r;\n";
}
// calculate the shadowed color and mix if with the lit color based on the
// ambient lighting. The 0.5 is a multiplier that darkens the shadow in
// proportion to ambient light. It should probably be a uniform.
buf2 <<
" vec4 colorInFullShadow = color * oe_shadow_ambient; \n"
" color = mix(colorInFullShadow, color, shadowFac); \n"
" color.a = alpha;\n"
"}\n";
std::string fragApplyLighting;
fragApplyLighting = buf2.str();
vp->setFunction(
"oe_shadow_applyLighting",
fragApplyLighting,
osgEarth::ShaderComp::LOCATION_FRAGMENT_LIGHTING );
setShadowUnit(sscene, su);
// VDSM uses a different sampler name, shadowTexture0.
ssStateSet
->getOrCreateUniform("shadowTexture", osg::Uniform::SAMPLER_2D_SHADOW)
->set(su);
return true;
}
void
ClampingBinTechnique::setUpCamera(OverlayDecorator::TechRTTParams& params)
{
// To store technique-specific per-view info:
LocalPerViewData* local = new LocalPerViewData();
params._techniqueData = local;
// set up a callback to extract the overlay projection matrix.
local->_cpm = new CPM();
// 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::LINEAR );
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->setReferenceFrame( osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT );
params._rttCamera->setClearColor( osg::Vec4f(0,0,0,0) );
params._rttCamera->setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
params._rttCamera->setComputeNearFarMode( osg::CullSettings::COMPUTE_NEAR_FAR_USING_BOUNDING_VOLUMES );
params._rttCamera->setViewport( 0, 0, *_textureSize, *_textureSize );
params._rttCamera->setRenderOrder( osg::Camera::PRE_RENDER );
params._rttCamera->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT );
params._rttCamera->attach( osg::Camera::DEPTH_BUFFER, local->_rttTexture.get() );
params._rttCamera->setClampProjectionMatrixCallback( local->_cpm.get() );
// 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 );
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 );
#if 0 //OOPS this kills things like a vertical scale shader!!
// installs a dirt-simple program for rendering the depth texture that
// skips all the normal terrain rendering stuff
osg::Program* depthProg = new osg::Program();
depthProg->addShader(new osg::Shader(
osg::Shader::VERTEX,
"void main() { gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; }\n"));
depthProg->addShader(new osg::Shader(
osg::Shader::FRAGMENT,
"void main() { gl_FragColor = vec4(1,1,1,1); }\n"));
rttStateSet->setAttributeAndModes(
depthProg,
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE | osg::StateAttribute::PROTECTED );
#endif
// attach the terrain to the camera.
// todo: should probably protect this with a mutex.....
params._rttCamera->addChild( _engine ); //params._terrainParent->getChild(0) ); // the terrain itself.
// assemble the overlay graph stateset.
local->_groupStateSet = new osg::StateSet();
local->_groupStateSet->setTextureAttributeAndModes(
_textureUnit,
local->_rttTexture.get(),
osg::StateAttribute::ON );
// set up depth test/write parameters for the overlay geometry:
local->_groupStateSet->setAttributeAndModes(
new osg::Depth( osg::Depth::LEQUAL, 0.0, 1.0, false ),
osg::StateAttribute::ON );
local->_groupStateSet->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
// 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_eye2depthclipmat",
osg::Uniform::FLOAT_MAT4 );
// matrix that transforms a vert from depth-cam CLIP coords to EYE coords.
local->_depthClipToCamViewUniform = local->_groupStateSet->getOrCreateUniform(
"oe_clamp_depthclip2eyemat",
osg::Uniform::FLOAT_MAT4 );
// make the shader that will do clamping and depth offsetting.
VirtualProgram* vp = new VirtualProgram();
vp->setName( "ClampingBinTechnique program" );
local->_groupStateSet->setAttributeAndModes( vp, osg::StateAttribute::ON );
// vertex shader - subgraph
std::string vertexSource = Stringify()
<< "#version " << GLSL_VERSION_STR << "\n"
#ifdef OSG_GLES2_AVAILABLE
<< "precision mediump float;\n"
#endif
// uniforms from this ClampingBinTechnique:
<< "uniform sampler2D oe_clamp_depthtex; \n"
<< "uniform mat4 oe_clamp_eye2depthclipmat; \n"
<< "uniform mat4 oe_clamp_depthclip2eyemat; \n"
// uniforms from ClampableNode:
<< "uniform vec2 oe_clamp_bias; \n"
<< "uniform vec2 oe_clamp_range; \n"
<< "varying vec4 oe_clamp_simvert; \n"
<< "varying float oe_clamp_simvertrange; \n"
<< "void oe_clamp_vertex(void) \n"
<< "{ \n"
// transform the vertex into the depth texture's clip coordinates.
<< " vec4 v_eye_orig = gl_ModelViewMatrix * gl_Vertex; \n"
<< " vec4 tc = oe_clamp_eye2depthclipmat * v_eye_orig; \n"
// sample the depth map.
<< " float d = texture2DProj( oe_clamp_depthtex, tc ).r; \n"
// make a fake point in depth clip space and transform it back into eye coords.
<< " vec4 p = vec4(tc.x, tc.y, d, 1.0); \n"
<< " vec4 v_eye_clamped = oe_clamp_depthclip2eyemat * p; \n"
// if the clamping distance is too big, bag it.
<< " vec3 v_eye_orig3 = v_eye_orig.xyz/v_eye_orig.w;\n"
<< " vec3 v_eye_clamped3 = v_eye_clamped.xyz/v_eye_clamped.w; \n"
<< " float clamp_distance = length(v_eye_orig3 - v_eye_clamped3); \n"
<< " const float maxClampDistance = 10000.0; \n"
<< " if ( clamp_distance > maxClampDistance ) \n"
<< " { \n"
<< " gl_Position = gl_ProjectionMatrix * v_eye_orig; \n"
// still have to populate these to nullify the depth offset code.
<< " oe_clamp_simvert = gl_Position; \n"
<< " oe_clamp_simvertrange = 1.0; \n"
<< " } \n"
<< " else \n"
<< " { \n"
// now simulate a "closer" vertex for depth offsetting.
// remap depth offset based on camera distance to vertex. The farther you are away,
// the more of an offset you need.
<< " float range = length(v_eye_clamped3); \n"
<< " float ratio = (clamp(range, oe_clamp_range[0], oe_clamp_range[1])-oe_clamp_range[0])/(oe_clamp_range[1]-oe_clamp_range[0]);\n"
<< " float bias = oe_clamp_bias[0] + ratio * (oe_clamp_bias[1]-oe_clamp_bias[0]);\n"
<< " vec3 adj_vec = normalize(v_eye_clamped3); \n"
<< " vec3 v_eye_offset3 = v_eye_clamped3 - (adj_vec * bias); \n"
<< " vec4 v_sim_eye = vec4( v_eye_offset3 * v_eye_clamped.w, v_eye_clamped.w ); \n"
<< " oe_clamp_simvert = gl_ProjectionMatrix * v_sim_eye;\n"
<< " oe_clamp_simvertrange = range - bias; \n"
<< " gl_Position = gl_ProjectionMatrix * v_eye_clamped; \n"
<< " } \n"
<< "} \n";
vp->setFunction( "oe_clamp_vertex", vertexSource, ShaderComp::LOCATION_VERTEX_POST_LIGHTING );
// fragment shader - depth offset apply
std::string frag =
"varying vec4 oe_clamp_simvert; \n"
"varying float oe_clamp_simvertrange; \n"
"void oe_clamp_fragment(inout vec4 color)\n"
"{ \n"
" float sim_depth = 0.5 * (1.0+(oe_clamp_simvert.z/oe_clamp_simvert.w));\n"
// if the offset pushed the Z behind the eye, the projection mapping will
// result in a z>1. We need to bring these values back down to the
// near clip plan (z=0). We need to check simRange too before doing this
// so we don't draw fragments that are legitimently beyond the far clip plane.
" if ( sim_depth > 1.0 && oe_clamp_simvertrange < 0.0 ) { sim_depth = 0.0; } \n"
" gl_FragDepth = max(0.0, sim_depth); \n"
"}\n";
vp->setFunction( "oe_clamp_fragment", frag, ShaderComp::LOCATION_FRAGMENT_PRE_LIGHTING );
}
int
main(int argc, char** argv)
{
osg::ArgumentParser arguments(&argc,argv);
// help?
if ( arguments.read("--help") )
return usage(argv[0]);
// create a viewer:
osgViewer::Viewer viewer(arguments);
// Tell the database pager to not modify the unref settings
viewer.getDatabasePager()->setUnrefImageDataAfterApplyPolicy( false, false );
// install our default manipulator (do this before calling load)
viewer.setCameraManipulator( new EarthManipulator(arguments) );
// disable the small-feature culling
viewer.getCamera()->setSmallFeatureCullingPixelSize(-1.0f);
// set a near/far ratio that is smaller than the default. This allows us to get
// closer to the ground without near clipping. If you need more, use --logdepth
viewer.getCamera()->setNearFarRatio(0.0001);
// load an earth file, and support all or our example command-line options
// and earth file <external> tags
osg::Node* node = MapNodeHelper().load( arguments, &viewer );
if ( node )
{
// Get the MapNode
MapNode* mapNode = MapNode::findMapNode( node );
// Find the Splat Extension
SplatExtension* splatExtension = mapNode->getExtension<SplatExtension>();
if (splatExtension)
{
OE_NOTICE << "Found Splat Extension" << std::endl;
}
LandCoverTerrainEffect* landCoverEffect = mapNode->getTerrainEngine()->getEffect<LandCoverTerrainEffect>();
if (landCoverEffect)
{
OE_NOTICE << "Found landcover terrain effect" << std::endl;
for (Zones::const_iterator zoneItr = landCoverEffect->getZones().begin();
zoneItr != landCoverEffect->getZones().end();
++zoneItr)
{
// Get the StateSet for each of the LandCoverLayers
for (LandCoverLayers::iterator landCoverItr = zoneItr->get()->getLandCover()->getLayers().begin();
landCoverItr != zoneItr->get()->getLandCover()->getLayers().end();
++landCoverItr)
{
// Get the stateset for the layer.
osg::StateSet* stateset = landCoverItr->get()->getOrCreateStateSet();
// Get the VirtualProgram for this layer.
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
// Make the "tree" layer all red.
if (landCoverItr->get()->getName() == "trees")
{
vp->setFunction( "color_landcover", color_landcover, ShaderComp::LOCATION_FRAGMENT_LIGHTING);
}
}
}
}
viewer.setSceneData( node );
while(!viewer.done())
{
viewer.frame();
}
}
else
{
return usage(argv[0]);
}
}
void
ShadowCaster::reinitialize()
{
if ( !_supported )
return;
_shadowmap = 0L;
_rttCameras.clear();
int numSlices = (int)_ranges.size() - 1;
if ( numSlices < 1 )
{
OE_WARN << LC << "Illegal. Must have at least one range slice." << std::endl;
return ;
}
// create the projected texture:
_shadowmap = new osg::Texture2DArray();
_shadowmap->setTextureSize( _size, _size, numSlices );
_shadowmap->setInternalFormat( GL_DEPTH_COMPONENT );
_shadowmap->setFilter( osg::Texture::MIN_FILTER, osg::Texture::LINEAR );
_shadowmap->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
_shadowmap->setWrap( osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_BORDER );
_shadowmap->setWrap( osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_BORDER );
_shadowmap->setBorderColor(osg::Vec4(1,1,1,1));
// set up the RTT camera:
for(int i=0; i<numSlices; ++i)
{
osg::Camera* rtt = new osg::Camera();
Shadowing::setIsShadowCamera(rtt);
rtt->setReferenceFrame( osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT );
rtt->setClearDepth( 1.0 );
rtt->setClearMask( GL_DEPTH_BUFFER_BIT );
rtt->setComputeNearFarMode( osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR );
rtt->setViewport( 0, 0, _size, _size );
rtt->setRenderOrder( osg::Camera::PRE_RENDER );
rtt->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT );
rtt->setImplicitBufferAttachmentMask(0, 0);
rtt->attach( osg::Camera::DEPTH_BUFFER, _shadowmap.get(), 0, i );
rtt->addChild( _castingGroup.get() );
_rttCameras.push_back(rtt);
}
_rttStateSet = new osg::StateSet();
// only draw back faces to the shadow depth map
_rttStateSet->setAttributeAndModes(
new osg::CullFace(osg::CullFace::FRONT),
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
_rttStateSet->addUniform(new osg::Uniform("oe_isShadowCamera", true), osg::StateAttribute::OVERRIDE);
_renderStateSet = new osg::StateSet();
std::string vertex = Stringify() <<
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"uniform mat4 oe_shadow_matrix[" << numSlices << "]; \n"
"varying vec4 oe_shadow_coord[" << numSlices << "]; \n"
"void oe_shadow_vertex(inout vec4 VertexVIEW) \n"
"{ \n"
" for(int i=0; i<" << numSlices << "; ++i) \n"
" oe_shadow_coord[i] = oe_shadow_matrix[i] * VertexVIEW;\n"
"} \n";
std::string fragment = Stringify() <<
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"#extension GL_EXT_texture_array : enable \n"
"uniform sampler2DArray oe_shadow_map; \n"
"uniform vec4 oe_shadow_color; \n"
"uniform float oe_shadow_blur; \n"
"varying vec3 vp_Normal; \n"
"varying vec4 oe_shadow_coord[" << numSlices << "]; \n"
//TODO-run a generator and rplace
"#define OE_SHADOW_NUM_SAMPLES 16\n"
"const vec2 oe_shadow_samples[OE_SHADOW_NUM_SAMPLES] = vec2[]( vec2( -0.942016, -0.399062 ), vec2( 0.945586, -0.768907 ), vec2( -0.094184, -0.929389 ), vec2( 0.344959, 0.293878 ), vec2( -0.915886, 0.457714 ), vec2( -0.815442, -0.879125 ), vec2( -0.382775, 0.276768 ), vec2( 0.974844, 0.756484 ), vec2( 0.443233, -0.975116 ), vec2( 0.53743, -0.473734 ), vec2( -0.264969, -0.41893 ), vec2( 0.791975, 0.190909 ), vec2( -0.241888, 0.997065 ), vec2( -0.8141, 0.914376 ), vec2( 0.199841, 0.786414 ), vec2( 0.143832, -0.141008 )); \n"
"float oe_shadow_rand(vec2 co){\n"
" return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);\n"
"}\n"
"vec2 oe_shadow_rot(vec2 p, float a) { \n"
" vec2 sincos = vec2(sin(a), cos(a)); \n"
" return vec2(dot(p, vec2(sincos.y, -sincos.x)), dot(p, sincos.xy)); \n"
"}\n"
// slow PCF sampling.
"float oe_shadow_multisample(in vec3 c, in float refvalue, in float blur) \n"
"{ \n"
" float shadowed = 0.0; \n"
" float a = 6.283185 * oe_shadow_rand(c.xy); \n"
" vec4 b = vec4(oe_shadow_rot(vec2(1,0),a), oe_shadow_rot(vec2(0,1),a)); \n"
" for(int i=0; i<OE_SHADOW_NUM_SAMPLES; ++i) { \n"
" vec2 off = oe_shadow_samples[i];\n"
" off = vec2(dot(off,b.xz), dot(off,b.yw)); \n"
" vec3 pc = vec3(c.xy + off*blur, c.z); \n"
" float depth = texture2DArray(oe_shadow_map, pc).r; \n"
" if ( depth < 1.0 && depth < refvalue ) { \n"
" shadowed += 1.0; \n"
" } \n"
" } \n"
" return 1.0-(shadowed/OE_SHADOW_NUM_SAMPLES); \n"
"} \n"
"void oe_shadow_fragment( inout vec4 color )\n"
"{\n"
" float alpha = color.a; \n"
" float factor = 1.0; \n"
// pre-pixel biasing to reduce moire/acne
" const float b0 = 0.001; \n"
" const float b1 = 0.01; \n"
" vec3 L = normalize(gl_LightSource[0].position.xyz); \n"
" vec3 N = normalize(vp_Normal); \n"
" float costheta = clamp(dot(L,N), 0.0, 1.0); \n"
" float bias = b0*tan(acos(costheta)); \n"
// loop over the slices:
" for(int i=0; i<" << numSlices << " && factor > 0.0; ++i) \n"
" { \n"
" vec4 c = oe_shadow_coord[i]; \n"
" vec3 coord = vec3(c.x, c.y, float(i)); \n"
" if ( oe_shadow_blur > 0.0 ) \n"
" { \n"
" factor = min(factor, oe_shadow_multisample(coord, c.z-bias, oe_shadow_blur)); \n"
" } \n"
" else \n"
" { \n"
" float depth = texture2DArray(oe_shadow_map, coord).r; \n"
" if ( depth < 1.0 && depth < c.z-bias ) \n"
" factor = 0.0; \n"
" } \n"
" } \n"
" vec4 colorInFullShadow = color * oe_shadow_color; \n"
" color = mix(colorInFullShadow, color, factor); \n"
" color.a = alpha;\n"
"}\n";
VirtualProgram* vp = VirtualProgram::getOrCreate(_renderStateSet.get());
vp->setFunction(
"oe_shadow_vertex",
vertex,
ShaderComp::LOCATION_VERTEX_VIEW,
0.9f );
vp->setFunction(
"oe_shadow_fragment",
fragment,
ShaderComp::LOCATION_FRAGMENT_LIGHTING,
0.9f );
// the texture coord generator matrix array (from the caster):
_shadowMapTexGenUniform = _renderStateSet->getOrCreateUniform(
"oe_shadow_matrix",
osg::Uniform::FLOAT_MAT4,
numSlices );
// bind the shadow map texture itself:
_renderStateSet->setTextureAttribute(
_texImageUnit,
_shadowmap.get(),
osg::StateAttribute::ON );
_renderStateSet->addUniform( new osg::Uniform("oe_shadow_map", _texImageUnit) );
// blur factor:
_shadowBlurUniform = _renderStateSet->getOrCreateUniform(
"oe_shadow_blur",
osg::Uniform::FLOAT);
_shadowBlurUniform->set(_blurFactor);
// shadow color:
_shadowColorUniform = _renderStateSet->getOrCreateUniform(
"oe_shadow_color",
osg::Uniform::FLOAT_VEC4);
_shadowColorUniform->set(_color);
}
osg::Node* run(osg::Node* earthfile)
{
// 32-bit vertex shader, for reference only. This shader will exceed
// the single-precision capacity and cause "jumping verts" at the
// camera make small movements.
const char* vs32 =
"#version 330 \n"
"uniform mat4 osg_ViewMatrixInverse; \n"
"flat out float isRed; \n"
"void vertex(inout vec4 v32) \n"
"{ \n"
" vec4 world = osg_ViewMatrixInverse * v32; \n"
" world /= world.w; \n"
" float len = length(world); \n"
" const float R = 6371234.5678; \n"
" isRed = 0.0; \n"
" if (len > R) \n"
" isRed = 1.0;"
"}\n";
// 64-bit vertex shader. This shader uses a double-precision inverse
// view matrix and calculates the altitude all in double precision;
// therefore the "jumping verts" problem in the 32-bit version is
// resolved. (Mostly-- you will still see the jumping if you view the
// earth from orbit, because the 32-bit vertex itself is very far from
// the camera in view coordinates. If that is an issue, you need to pass
// in 64-bit vertex attributes.)
const char* vs64 =
"#version 330 \n"
"#extension GL_ARB_gpu_shader_fp64 : enable \n"
"uniform dmat4 u_ViewMatrixInverse64; \n" // must use a 64-bit VMI.
"flat out float isRed; \n"
"flat out double vary64; \n" // just to test shadercomp framework
"void vertex(inout vec4 v32) \n"
"{ \n"
" dvec4 v64 = dvec4(v32); \n" // upcast to 64-bit, no precision loss
// unless camera is very far away
" dvec4 world = u_ViewMatrixInverse64 * v64; \n" // xform into world coords
" world /= world.w; \n" // divide by w
" double len = length(world.xyz); \n" // get double-precision vector length.
" const double R = 6371234.5678; \n" // arbitrary earth radius threshold
" isRed = (len > R) ? 1.0 : 0.0; \n"
"}\n";
// frag shader: color the terrain red if the incoming varying is non-zero.
const char* fs =
"#version 330 \n"
"#extension GL_ARB_gpu_shader_fp64 : enable \n"
"flat in float isRed; \n"
"flat in double vary64; \n"
"void fragment(inout vec4 color) \n"
"{ \n"
" if (isRed > 0.0f) { \n"
" color.r = 1.0; \n"
" color.gb *= 0.5; \n"
" } \n"
"} \n";
// installs a double-precision inverse view matrix for our shader to use.
struct VMI64Callback : public osg::NodeCallback
{
void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
osg::Uniform* u = new osg::Uniform(osg::Uniform::DOUBLE_MAT4, "u_ViewMatrixInverse64");
u->set(cv->getCurrentCamera()->getInverseViewMatrix());
osg::ref_ptr<osg::StateSet> ss = new osg::StateSet();
ss->addUniform(u);
cv->pushStateSet(ss.get());
traverse(node, nv);
cv->popStateSet();
}
};
earthfile->setCullCallback(new VMI64Callback());
osg::StateSet* ss = earthfile->getOrCreateStateSet();
VirtualProgram* vp = VirtualProgram::getOrCreate(ss);
vp->setFunction("vertex", vs64, ShaderComp::LOCATION_VERTEX_VIEW);
vp->setFunction("fragment", fs, ShaderComp::LOCATION_FRAGMENT_COLORING);
return earthfile;
}
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->attach( osg::Camera::COLOR_BUFFER, projTexture, 0, 0, _mipmapping );
if ( _attachStencil )
{
// 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_DEPTH_BUFFER_BIT | GL_STENCIL_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.
if ( _useShaders )
{
VirtualProgram* vp = VirtualProgram::getOrCreate(rttStateSet);
vp->setName( "DrapingTechnique RTT" );
vp->setInheritShaders( false );
//rttStateSet->setAttributeAndModes( vp, osg::StateAttribute::ON );
}
// active 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(1.4f))
{
//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;
if ( _useShaders )
{
// GPU path
VirtualProgram* vp = VirtualProgram::getOrCreate(params._terrainStateSet);
vp->setName( "DrapingTechnique terrain shaders");
//params._terrainStateSet->setAttributeAndModes( vp, osg::StateAttribute::ON );
// 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 );
// vertex shader - subgraph
std::string vs =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"uniform mat4 oe_overlay_texmatrix; \n"
"varying vec4 oe_overlay_texcoord; \n"
"void oe_overlay_vertex(inout vec4 VertexVIEW) \n"
"{ \n"
" oe_overlay_texcoord = oe_overlay_texmatrix * VertexVIEW; \n"
"} \n";
vp->setFunction( "oe_overlay_vertex", vs, ShaderComp::LOCATION_VERTEX_VIEW );
// fragment shader - subgraph
std::string fs =
"#version " GLSL_VERSION_STR "\n"
GLSL_DEFAULT_PRECISION_FLOAT "\n"
"uniform sampler2D oe_overlay_tex; \n"
"varying vec4 oe_overlay_texcoord; \n"
"void oe_overlay_fragment( inout vec4 color ) \n"
"{ \n"
" vec4 texel = texture2DProj(oe_overlay_tex, oe_overlay_texcoord); \n"
" color = vec4( mix( color.rgb, texel.rgb, texel.a ), color.a); \n"
"} \n";
vp->setFunction( "oe_overlay_fragment", fs, ShaderComp::LOCATION_FRAGMENT_COLORING );
}
else
{
// FFP path
local->_texGen = new osg::TexGen();
local->_texGen->setMode( osg::TexGen::EYE_LINEAR );
params._terrainStateSet->setTextureAttributeAndModes( *_textureUnit, local->_texGen.get(), 1 );
osg::TexEnv* env = new osg::TexEnv();
env->setMode( osg::TexEnv::DECAL );
params._terrainStateSet->setTextureAttributeAndModes( *_textureUnit, env, 1 );
}
}
int
main(int argc, char** argv)
{
osg::ArgumentParser arguments(&argc,argv);
// help?
if ( arguments.read("--help") )
return usage(argv[0]);
// set up a viewer:
osgViewer::Viewer viewer(arguments);
viewer.getDatabasePager()->setUnrefImageDataAfterApplyPolicy( false, false );
// install our default manipulator (do this before calling load)
viewer.setCameraManipulator( new EarthManipulator() );
// load an earth file, and support all or our example command-line options
// and earth file <external> tags
osg::Node* node = MapNodeHelper().load( arguments, &viewer );
if ( node )
{
// Make a root group:
osg::Group* root = new osg::Group();
root->addChild( node );
viewer.setSceneData( root );
// Install a ClipNode. The ClipNode establishes positional state so it
// doesn't need to parent anything. In this case it needs to be at the
// top of the scene graph since out clip plane calculator assumes
// you're in world space.
osg::ClipNode* clipNode = new osg::ClipNode();
root->addChild( clipNode );
// By default, the clip node will activate any clip planes you add to it
// for its subgraph. Our clip node doesn't parent anything, but we include
// this to demonstrate how you would disable that:
clipNode->getOrCreateStateSet()->setMode(GL_CLIP_PLANE0, 0);
// Create a ClipPlane we will use to clip to the visible horizon:
osg::ClipPlane* cp = new osg::ClipPlane();
clipNode->addClipPlane( cp );
// This cull callback will recalcuate the position of the clipping plane
// each frame based on the camera.
const osgEarth::SpatialReference* srs = osgEarth::MapNode::get(node)->getMapSRS();
clipNode->addCullCallback( new ClipToGeocentricHorizon(srs, cp) );
// We also need a shader that will activate clipping in GLSL.
VirtualProgram* vp = VirtualProgram::getOrCreate(root->getOrCreateStateSet());
vp->setFunction("oe_clip_vert", clipvs, ShaderComp::LOCATION_VERTEX_VIEW);
// Now everything is set up. The last thing to do is: anywhere in your
// scene graph that you want to activate the clipping plane, set the
// corresponding mode on, like so:
//
// node->getOrCreateStateSet()->setMode(GL_CLIP_PLANE0, osg::StateAttribute::ON);
//
// If you are using symbology, you can use RenderSymbol::clipPlane(). Or in
// the earth file, for example:
//
// render-depth-test: false;
// render-clip-plane: 0;
return viewer.run();
}
else
{
return usage(argv[0]);
}
}
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
SimpleOceanNode::rebuild()
{
this->removeChildren( 0, this->getNumChildren() );
if ( _parentMapNode.valid() )
{
const MapOptions& parentMapOptions = _parentMapNode->getMap()->getMapOptions();
const MapNodeOptions& parentMapNodeOptions = _parentMapNode->getMapNodeOptions();
// set up the map to "match" the parent map:
MapOptions mo;
mo.coordSysType() = parentMapOptions.coordSysType();
mo.profile() = _parentMapNode->getMap()->getProfile()->toProfileOptions();
// new data model for the ocean:
Map* oceanMap = new Map( mo );
// ditto with the map node options:
MapNodeOptions mno;
if ( mno.enableLighting().isSet() )
mno.enableLighting() = *mno.enableLighting();
MPTerrainEngineOptions mpoptions;
mpoptions.heightFieldSkirtRatio() = 0.0; // don't want to see skirts
mpoptions.minLOD() = _options.maxLOD().get(); // weird, I know
// so we can the surface from underwater:
mpoptions.clusterCulling() = false; // want to see underwater
mpoptions.enableBlending() = true; // gotsta blend with the main node
mpoptions.color() = _options.baseColor().get();
mno.setTerrainOptions( mpoptions );
// make the ocean's map node:
MapNode* oceanMapNode = new MapNode( oceanMap, mno );
// if the caller requested a mask layer, install that now.
if ( _options.maskLayer().isSet() )
{
if ( !_options.maskLayer()->maxLevel().isSet() )
{
// set the max subdivision level if it's not already specified in the
// mask layer options:
_options.maskLayer()->maxLevel() = *_options.maxLOD();
}
// make sure the mask is shared (so we can access it from our shader)
// and invisible (so we can't see it)
_options.maskLayer()->shared() = true;
_options.maskLayer()->visible() = false;
ImageLayer* maskLayer = new ImageLayer( "ocean-mask", *_options.maskLayer() );
oceanMap->addImageLayer( maskLayer );
}
// otherwise, install a "proxy layer" that will use the elevation data in the map
// to determine where the ocean is. This approach is limited in that it cannot
// detect the difference between ocean and inland areas that are below sea level.
else
{
// install an "elevation proxy" layer that reads elevation tiles from the
// parent map and turns them into encoded images for our shader to use.
ImageLayerOptions epo( "ocean-proxy" );
epo.cachePolicy() = CachePolicy::NO_CACHE;
//epo.maxLevel() = *_options.maxLOD();
oceanMap->addImageLayer( new ElevationProxyImageLayer(_parentMapNode->getMap(), epo) );
}
this->addChild( oceanMapNode );
// set up the shaders.
osg::StateSet* ss = this->getOrCreateStateSet();
// install the shaders on the ocean map node.
VirtualProgram* vp = VirtualProgram::getOrCreate( ss );
vp->setName( "osgEarth SimpleOcean" );
// use the appropriate shader for the active technique:
std::string vertSource = _options.maskLayer().isSet() ? source_vertMask : source_vertProxy;
std::string fragSource = _options.maskLayer().isSet() ? source_fragMask : source_fragProxy;
vp->setFunction( "oe_ocean_vertex", vertSource, ShaderComp::LOCATION_VERTEX_VIEW );
vp->setFunction( "oe_ocean_fragment", fragSource, ShaderComp::LOCATION_FRAGMENT_COLORING, 0.6f );
// install the slot attribute(s)
ss->getOrCreateUniform( "ocean_data", osg::Uniform::SAMPLER_2D )->set( 0 );
// set up the options uniforms.
_seaLevel = new osg::Uniform(osg::Uniform::FLOAT, "ocean_seaLevel");
ss->addUniform( _seaLevel.get() );
_lowFeather = new osg::Uniform(osg::Uniform::FLOAT, "ocean_lowFeather");
ss->addUniform( _lowFeather.get() );
_highFeather = new osg::Uniform(osg::Uniform::FLOAT, "ocean_highFeather");
ss->addUniform( _highFeather.get() );
_baseColor = new osg::Uniform(osg::Uniform::FLOAT_VEC4, "ocean_baseColor");
ss->addUniform( _baseColor.get() );
_maxRange = new osg::Uniform(osg::Uniform::FLOAT, "ocean_max_range");
ss->addUniform( _maxRange.get() );
_fadeRange = new osg::Uniform(osg::Uniform::FLOAT, "ocean_fade_range");
ss->addUniform( _fadeRange.get() );
// trick to mitigate z-fighting..
ss->setAttributeAndModes( new osg::Depth(osg::Depth::LEQUAL, 0.0, 1.0, false) );
ss->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
// load up a surface texture
osg::ref_ptr<osg::Image> surfaceImage;
ss->getOrCreateUniform( "ocean_has_surface_tex", osg::Uniform::BOOL )->set( false );
if ( _options.textureURI().isSet() )
{
//TODO: enable cache support here?
surfaceImage = _options.textureURI()->getImage();
}
if ( !surfaceImage.valid() )
{
surfaceImage = createSurfaceImage();
}
if ( surfaceImage.valid() )
{
osg::Texture2D* tex = new osg::Texture2D( surfaceImage.get() );
tex->setFilter( osg::Texture::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR );
tex->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
tex->setWrap ( osg::Texture::WRAP_S, osg::Texture::REPEAT );
tex->setWrap ( osg::Texture::WRAP_T, osg::Texture::REPEAT );
ss->setTextureAttributeAndModes( 2, tex, 1 );
ss->getOrCreateUniform( "ocean_surface_tex", osg::Uniform::SAMPLER_2D )->set( 2 );
ss->getOrCreateUniform( "ocean_has_surface_tex", osg::Uniform::BOOL )->set( true );
}
// remove backface culling so we can see underwater
// (use OVERRIDE since the terrain engine sets back face culling.)
ss->setAttributeAndModes(
new osg::CullFace(),
osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE );
// Material.
osg::Material* m = new osg::Material();
m->setAmbient(m->FRONT_AND_BACK, osg::Vec4(0,0,0,1));
m->setDiffuse(m->FRONT_AND_BACK, osg::Vec4(1,1,1,1));
m->setSpecular(m->FRONT_AND_BACK, osg::Vec4(0.1,0.1,0.1,1));
m->setEmission(m->FRONT_AND_BACK, osg::Vec4(0,0,0,1));
m->setShininess(m->FRONT_AND_BACK, 32.0);
ss->setAttributeAndModes(m, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE );
// force apply options:
applyOptions();
}
}
void
TextureCompositorMultiTexture::updateMasterStateSet(osg::StateSet* stateSet,
const TextureLayout& layout ) const
{
int numSlots = layout.getMaxUsedSlot() + 1;
int maxUnits = numSlots;
if ( _useGPU )
{
// Validate against the max number of GPU texture units:
if ( maxUnits > Registry::instance()->getCapabilities().getMaxGPUTextureUnits() )
{
maxUnits = Registry::instance()->getCapabilities().getMaxGPUTextureUnits();
OE_WARN << LC
<< "Warning! You have exceeded the number of texture units available on your GPU ("
<< maxUnits << "). Consider using another compositing mode."
<< std::endl;
}
VirtualProgram* vp = static_cast<VirtualProgram*>( stateSet->getAttribute(VirtualProgram::SA_TYPE) );
// see if we have any blended layers:
bool hasBlending = layout.containsSecondarySlots( maxUnits );
// Why are these marked as PROTECTED? See the comments in MapNode.cpp for the answer.
// (Where it sets up the top-level VirtualProgram)
vp->setFunction(
"oe_multicomp_vertex",
s_createTextureVertexShader(layout, hasBlending),
ShaderComp::LOCATION_VERTEX_MODEL,
0.0 );
vp->setFunction(
"oe_multicomp_fragment",
s_createTextureFragShaderFunction(layout, maxUnits, hasBlending, _lodTransitionTime),
ShaderComp::LOCATION_FRAGMENT_COLORING,
0.0 );
//vp->setShader(
// "osgearth_vert_setupColoring",
// s_createTextureVertexShader(layout, hasBlending),
// osg::StateAttribute::ON | osg::StateAttribute::PROTECTED );
//vp->setShader(
// "osgearth_frag_applyColoring",
// s_createTextureFragShaderFunction(layout, maxUnits, hasBlending, _lodTransitionTime),
// osg::StateAttribute::ON | osg::StateAttribute::PROTECTED );
}
else
{
// Forcably disable shaders
stateSet->setAttributeAndModes( new osg::Program(), osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED );
// Validate against the maximum number of textures available in FFP mode.
if ( maxUnits > Registry::instance()->getCapabilities().getMaxFFPTextureUnits() )
{
maxUnits = Registry::instance()->getCapabilities().getMaxFFPTextureUnits();
OE_WARN << LC <<
"Warning! You have exceeded the number of texture units available in fixed-function pipeline "
"mode on your graphics hardware (" << maxUnits << "). Consider using another "
"compositing mode." << std::endl;
}
// FFP multitexturing requires that we set up a series of TexCombine attributes:
if (maxUnits == 1)
{
osg::TexEnv* texenv = new osg::TexEnv(osg::TexEnv::MODULATE);
stateSet->setTextureAttributeAndModes(0, texenv, osg::StateAttribute::ON);
}
else if (maxUnits >= 2)
{
//Blend together the colors and accumulate the alpha values of textures 0 and 1 on unit 0
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
texenv->setCombine_Alpha(osg::TexEnvCombine::ADD);
texenv->setSource0_RGB(osg::TexEnvCombine::TEXTURE0+1);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource0_Alpha(osg::TexEnvCombine::TEXTURE0+1);
texenv->setOperand0_Alpha(osg::TexEnvCombine::SRC_ALPHA);
texenv->setSource1_RGB(osg::TexEnvCombine::TEXTURE0+0);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_Alpha(osg::TexEnvCombine::TEXTURE0+0);
texenv->setOperand1_Alpha(osg::TexEnvCombine::SRC_ALPHA);
texenv->setSource2_RGB(osg::TexEnvCombine::TEXTURE0+1);
texenv->setOperand2_RGB(osg::TexEnvCombine::SRC_ALPHA);
stateSet->setTextureAttributeAndModes(0, texenv, osg::StateAttribute::ON);
}
//For textures 2 and beyond, blend them together with the previous
//Add the alpha values of this unit and the previous unit
for (int unit = 1; unit < maxUnits-1; ++unit)
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
texenv->setCombine_Alpha(osg::TexEnvCombine::ADD);
texenv->setSource0_RGB(osg::TexEnvCombine::TEXTURE0+unit+1);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource0_Alpha(osg::TexEnvCombine::TEXTURE0+unit+1);
texenv->setOperand0_Alpha(osg::TexEnvCombine::SRC_ALPHA);
texenv->setSource1_RGB(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_Alpha(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand1_Alpha(osg::TexEnvCombine::SRC_ALPHA);
texenv->setSource2_RGB(osg::TexEnvCombine::TEXTURE0+unit+1);
texenv->setOperand2_RGB(osg::TexEnvCombine::SRC_ALPHA);
stateSet->setTextureAttributeAndModes(unit, texenv, osg::StateAttribute::ON);
}
//Modulate the colors to get proper lighting on the last unit
//Keep the alpha results from the previous stage
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::MODULATE);
texenv->setCombine_Alpha(osg::TexEnvCombine::REPLACE);
texenv->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource0_Alpha(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand0_Alpha(osg::TexEnvCombine::SRC_ALPHA);
texenv->setSource1_RGB(osg::TexEnvCombine::PRIMARY_COLOR);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
stateSet->setTextureAttributeAndModes(maxUnits-1, texenv, osg::StateAttribute::ON);
}
}
}
}
void
DetailTexture::onInstall(TerrainEngineNode* engine)
{
if ( engine )
{
if ( !_texture.valid() )
{
_texture = new osg::Texture2DArray();
_texture->setTextureSize(1024, 1024, _textures.size());
_texture->setWrap( osg::Texture::WRAP_S, osg::Texture::REPEAT );
_texture->setWrap( osg::Texture::WRAP_T, osg::Texture::REPEAT );
_texture->setFilter( osg::Texture::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR );
_texture->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
_texture->setResizeNonPowerOfTwoHint( false );
for(unsigned i=0; i<_textures.size(); ++i)
{
const TextureSource& ts = _textures[i];
osg::ref_ptr<osg::Image> image = URI(ts._url).getImage(_dbOptions.get());
if ( image->s() != 1024 || image->t() != 1024 )
{
osg::ref_ptr<osg::Image> imageResized;
ImageUtils::resizeImage( image.get(), 1024, 1024, imageResized );
_texture->setImage( i, imageResized.get() );
}
else
{
_texture->setImage( i, image.get() );
}
}
}
osg::StateSet* stateset = engine->getOrCreateStateSet();
if ( engine->getTextureCompositor()->reserveTextureImageUnit(_unit) )
{
_samplerUniform = stateset->getOrCreateUniform( "oe_detail_tex", osg::Uniform::SAMPLER_2D_ARRAY );
_samplerUniform->set( _unit );
stateset->setTextureAttribute( _unit, _texture.get(), osg::StateAttribute::ON ); // don't use "..andModes"
}
if ( _maskLayer.valid() )
{
int unit = *_maskLayer->shareImageUnit();
_maskUniform = stateset->getOrCreateUniform("oe_detail_mask", osg::Uniform::SAMPLER_2D);
_maskUniform->set(unit);
OE_NOTICE << LC << "Installed layer " << _maskLayer->getName() << " as texture mask on unit " << unit << std::endl;
}
else
{
exit(-1);
}
stateset->addUniform( _startLODUniform.get() );
stateset->addUniform( _intensityUniform.get() );
stateset->addUniform( _scaleUniform.get() );
stateset->addUniform( _attenuationDistanceUniform.get() );
std::string fs = generateFragmentShader( _textures.size(), _octaves.value() );
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
vp->setFunction( "oe_detail_vertex", vs, ShaderComp::LOCATION_VERTEX_VIEW );
vp->setFunction( "oe_detail_fragment", fs, ShaderComp::LOCATION_FRAGMENT_COLORING );
vp->setShader(
"simplexNoise",
new osg::Shader(osg::Shader::FRAGMENT, snoise) );
}
}
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->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 );
// 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->_horizonDistanceUniform = local->_groupStateSet->getOrCreateUniform(
"oe_clamp_horizonDistance",
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
// make the shader that will do clamping and depth offsetting.
VirtualProgram* vp = VirtualProgram::getOrCreate(local->_groupStateSet.get());
vp->setName( "ClampingTechnique" );
vp->setFunction( "oe_clamp_vertex", clampingVertexShader, ShaderComp::LOCATION_VERTEX_VIEW );
vp->setFunction( "oe_clamp_fragment", clampingFragmentShader, ShaderComp::LOCATION_FRAGMENT_COLORING );
}
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 );
}
// Generates the main shader code for rendering the terrain.
void
RexTerrainEngineNode::updateState()
{
if ( _batchUpdateInProgress )
{
_stateUpdateRequired = true;
}
else
{
osg::StateSet* terrainStateSet = _terrain->getOrCreateStateSet(); // everything
osg::StateSet* surfaceStateSet = getSurfaceStateSet(); // just the surface
// required for multipass tile rendering to work
surfaceStateSet->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 patch param if we are tessellation on the GPU.
if ( _terrainOptions.gpuTessellation() == true )
{
#ifdef HAVE_PATCH_PARAMETER
terrainStateSet->setAttributeAndModes( new osg::PatchParameter(3) );
#endif
}
// install shaders, if we're using them.
if ( Registry::capabilities().supportsGLSL() )
{
Shaders package;
VirtualProgram* terrainVP = VirtualProgram::getOrCreate(terrainStateSet);
terrainVP->setName( "Rex Terrain" );
package.load(terrainVP, package.ENGINE_VERT_MODEL);
//moved to CTOR so it's always available
//package.load(terrainVP, package.SDK);
bool useTerrainColor = _terrainOptions.color().isSet();
package.define("OE_REX_USE_TERRAIN_COLOR", useTerrainColor);
if ( useTerrainColor )
{
surfaceStateSet->addUniform(new osg::Uniform("oe_terrain_color", _terrainOptions.color().get()));
}
bool useBlending = _terrainOptions.enableBlending().get();
package.define("OE_REX_GL_BLENDING", useBlending);
bool morphImagery = _terrainOptions.morphImagery().get();
package.define("OE_REX_MORPH_IMAGERY", morphImagery);
// Funtions that affect only the terrain surface:
VirtualProgram* surfaceVP = VirtualProgram::getOrCreate(surfaceStateSet);
surfaceVP->setName("Rex Surface");
// Functions that affect the terrain surface only:
package.load(surfaceVP, package.ENGINE_VERT_VIEW);
package.load(surfaceVP, package.ENGINE_FRAG);
// Normal mapping shaders:
if ( this->normalTexturesRequired() )
{
package.load(surfaceVP, package.NORMAL_MAP_VERT);
package.load(surfaceVP, package.NORMAL_MAP_FRAG);
}
// Morphing?
if (_terrainOptions.morphTerrain() == true ||
_terrainOptions.morphImagery() == true)
{
package.define("OE_REX_VERTEX_MORPHING", (_terrainOptions.morphTerrain() == true));
package.load(surfaceVP, package.MORPHING_VERT);
}
for(LandCoverZones::iterator zone = _landCoverData._zones.begin(); zone != _landCoverData._zones.end(); ++zone)
{
for(LandCoverBins::iterator bin = zone->_bins.begin(); bin != zone->_bins.end(); ++bin)
{
osg::StateSet* landCoverStateSet = bin->_binProto->getStateSet();
// enable alpha-to-coverage multisampling for vegetation.
landCoverStateSet->setMode(GL_SAMPLE_ALPHA_TO_COVERAGE_ARB, 1);
// uniform that communicates the availability of multisampling.
landCoverStateSet->addUniform( new osg::Uniform(
"oe_terrain_hasMultiSamples",
osg::DisplaySettings::instance()->getMultiSamples()) );
landCoverStateSet->setAttributeAndModes(
new osg::BlendFunc(GL_ONE, GL_ZERO, GL_ONE, GL_ZERO),
osg::StateAttribute::OVERRIDE );
#ifdef HAVE_OSG_PATCH_PARAMETER
landCoverStateSet->setAttributeAndModes( new osg::PatchParameter(3) );
#endif
}
}
// 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"
"$COLOR_FILTER_HEAD"
"void oe_rexEngine_applyFilters(inout vec4 color) \n"
"{ \n"
"$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( surfaceStateSet );
}
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 );
surfaceVP->setFunction(
"oe_rexEngine_applyFilters",
fs_colorfilters,
ShaderComp::LOCATION_FRAGMENT_COLORING,
0.0 );
}
}
// Apply uniforms for sampler bindings:
OE_DEBUG << LC << "Render Bindings:\n";
for(RenderBindings::const_iterator b = _renderBindings.begin(); b != _renderBindings.end(); ++b)
{
if ( b->isActive() )
{
terrainStateSet->addUniform( new osg::Uniform(b->samplerName().c_str(), b->unit()) );
OE_DEBUG << LC << " > Bound \"" << b->samplerName() << "\" to unit " << b->unit() << "\n";
}
}
// uniform that controls per-layer opacity
terrainStateSet->addUniform( new osg::Uniform("oe_layer_opacity", 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->addUniform( new osg::Uniform("oe_layer_uid", (int)-1 ) );
// uniform that conveys the render order, since the shaders
// need to know which is the first layer in order to blend properly
terrainStateSet->addUniform( new osg::Uniform("oe_layer_order", (int)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() );
terrainStateSet->addUniform(new osg::Uniform("oe_tile_size", (float)_terrainOptions.tileSize().get()));
// special object ID that denotes the terrain surface.
surfaceStateSet->addUniform( new osg::Uniform(
Registry::objectIndex()->getObjectIDUniformName().c_str(), OSGEARTH_OBJECTID_TERRAIN) );
}
_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 );
}
// Generates the main shader code for rendering the terrain.
void
RexTerrainEngineNode::updateState()
{
if ( _batchUpdateInProgress )
{
_stateUpdateRequired = true;
}
else
{
osg::StateSet* terrainStateSet = _terrain->getOrCreateStateSet(); // everything
osg::StateSet* surfaceStateSet = getSurfaceStateSet(); // just the surface
//terrainStateSet->setRenderBinDetails(0, "SORT_FRONT_TO_BACK");
// required for multipass tile rendering to work
surfaceStateSet->setAttributeAndModes(
new osg::Depth(osg::Depth::LEQUAL, 0, 1, true) );
surfaceStateSet->setAttributeAndModes(
new osg::CullFace(), osg::StateAttribute::ON);
// activate standard mix blending.
terrainStateSet->setAttributeAndModes(
new osg::BlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA),
osg::StateAttribute::ON );
// install patch param if we are tessellation on the GPU.
if ( _terrainOptions.gpuTessellation() == true )
{
#ifdef HAVE_PATCH_PARAMETER
terrainStateSet->setAttributeAndModes( new osg::PatchParameter(3) );
#endif
}
// install shaders, if we're using them.
if ( Registry::capabilities().supportsGLSL() )
{
Shaders package;
VirtualProgram* terrainVP = VirtualProgram::getOrCreate(terrainStateSet);
terrainVP->setName( "Rex Terrain" );
package.load(terrainVP, package.ENGINE_VERT_MODEL);
surfaceStateSet->addUniform(new osg::Uniform("oe_terrain_color", _terrainOptions.color().get()));
if (_terrainOptions.enableBlending() == true)
{
surfaceStateSet->setDefine("OE_TERRAIN_BLEND_IMAGERY");
}
// Funtions that affect only the terrain surface:
VirtualProgram* surfaceVP = VirtualProgram::getOrCreate(surfaceStateSet);
surfaceVP->setName("Rex Surface");
// Functions that affect the terrain surface only:
package.load(surfaceVP, package.ENGINE_VERT_VIEW);
package.load(surfaceVP, package.ENGINE_FRAG);
// Elevation?
if (this->elevationTexturesRequired())
{
surfaceStateSet->setDefine("OE_TERRAIN_RENDER_ELEVATION");
}
// Normal mapping shaders:
if ( this->normalTexturesRequired() )
{
package.load(surfaceVP, package.NORMAL_MAP_VERT);
package.load(surfaceVP, package.NORMAL_MAP_FRAG);
surfaceStateSet->setDefine("OE_TERRAIN_RENDER_NORMAL_MAP");
}
// Morphing?
if (_terrainOptions.morphTerrain() == true ||
_terrainOptions.morphImagery() == true)
{
package.load(surfaceVP, package.MORPHING_VERT);
if (_terrainOptions.morphImagery() == true)
{
surfaceStateSet->setDefine("OE_TERRAIN_MORPH_IMAGERY");
}
if (_terrainOptions.morphTerrain() == true)
{
surfaceStateSet->setDefine("OE_TERRAIN_MORPH_GEOMETRY");
}
}
// 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"
"$COLOR_FILTER_HEAD"
"void oe_rexEngine_applyFilters(inout vec4 color) \n"
"{ \n"
"$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;
ImageLayerVector imageLayers;
_update_mapf->getLayers(imageLayers);
for( int i=0; i<imageLayers.size(); ++i )
{
ImageLayer* layer = imageLayers.at(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( surfaceStateSet );
}
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 );
surfaceVP->setFunction(
"oe_rexEngine_applyFilters",
fs_colorfilters,
ShaderComp::LOCATION_FRAGMENT_COLORING,
0.6 );
}
}
// Apply uniforms for sampler bindings:
OE_DEBUG << LC << "Render Bindings:\n";
osg::ref_ptr<osg::Texture> tex = new osg::Texture2D(ImageUtils::createEmptyImage(1,1));
for (unsigned i = 0; i < _renderBindings.size(); ++i)
{
SamplerBinding& b = _renderBindings[i];
if (b.isActive())
{
osg::Uniform* u = new osg::Uniform(b.samplerName().c_str(), b.unit());
terrainStateSet->addUniform( u );
OE_DEBUG << LC << " > Bound \"" << b.samplerName() << "\" to unit " << b.unit() << "\n";
terrainStateSet->setTextureAttribute(b.unit(), tex.get());
}
}
// uniform that controls per-layer opacity
terrainStateSet->addUniform( new osg::Uniform("oe_layer_opacity", 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->addUniform( new osg::Uniform("oe_layer_uid", (int)-1 ) );
// uniform that conveys the render order, since the shaders
// need to know which is the first layer in order to blend properly
terrainStateSet->addUniform( new osg::Uniform("oe_layer_order", (int)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->addUniform( new osg::Uniform("oe_layer_attenuationRange", _terrainOptions.attentuationDistance().get()) );
terrainStateSet->getOrCreateUniform(
"oe_min_tile_range_factor",
osg::Uniform::FLOAT)->set( *_terrainOptions.minTileRangeFactor() );
terrainStateSet->addUniform(new osg::Uniform("oe_tile_size", (float)_terrainOptions.tileSize().get()));
// special object ID that denotes the terrain surface.
surfaceStateSet->addUniform( new osg::Uniform(
Registry::objectIndex()->getObjectIDUniformName().c_str(), OSGEARTH_OBJECTID_TERRAIN) );
}
_stateUpdateRequired = false;
}
}
bool
ShaderGenerator::processGeometry( osg::StateSet* ss, osg::ref_ptr<osg::StateSet>& replacement )
{
// do nothing if there's no GLSL support
if ( !Registry::capabilities().supportsGLSL() )
return false;
// State object with extra accessors:
StateEx* state = static_cast<StateEx*>(_state.get());
// check for a real osg::Program in the whole state stack. If it exists, bail out
// so that OSG can use the program already in the graph. We never override a
// full Program.
osg::StateAttribute* program = state->getAttribute(osg::StateAttribute::PROGRAM);
if ( dynamic_cast<osg::Program*>(program) != 0L )
return false;
// see if the current state set contains a VirtualProgram already. If so,
// we will add to it if necessary.
VirtualProgram* vp = dynamic_cast<VirtualProgram*>( ss->getAttribute(VirtualProgram::SA_TYPE) );
// Check whether the lighting state has changed and install a mode uniform.
if ( ss->getMode(GL_LIGHTING) != osg::StateAttribute::INHERIT )
{
if ( !replacement.valid() )
replacement = osg::clone(ss, osg::CopyOp::DEEP_COPY_ALL);
ShaderFactory* sf = Registry::instance()->getShaderFactory();
osg::StateAttribute::GLModeValue value = state->getMode(GL_LIGHTING); // from the state, not the ss.
replacement->addUniform( sf->createUniformForGLMode(GL_LIGHTING, value) );
}
// if the stateset changes any texture attributes, we need a new virtual program:
if (ss->getTextureAttributeList().size() > 0)
{
if ( !replacement.valid() )
replacement = osg::clone(ss, osg::CopyOp::DEEP_COPY_ALL);
// work off the state's accumulated texture attribute set:
int texCount = state->getNumTextureAttributes();
if ( !vp )
{
vp = osg::clone( _defaultVP.get() );
replacement->setAttributeAndModes( vp, osg::StateAttribute::ON );
}
// start generating the shader source.
std::stringstream vertHead, vertBody, fragHead, fragBody;
// compatibility strings make it work in GL or GLES.
vertHead << "#version " GLSL_VERSION_STR "\n" GLSL_PRECISION;
fragHead << "#version " GLSL_VERSION_STR "\n" GLSL_PRECISION;
// function declarations:
vertBody << "void " VERTEX_FUNCTION "()\n{\n";
fragBody << "void " FRAGMENT_FUNCTION "(inout vec4 color)\n{\n";
for( int t = 0; t < texCount; ++t )
{
if (t == 0)
{
fragBody << INDENT << MEDIUMP "vec4 texel; \n";
}
osg::StateAttribute* tex = state->getTextureAttribute( t, osg::StateAttribute::TEXTURE );
if ( tex )
{
// see if we have a texenv; if so get its blending mode.
osg::TexEnv::Mode blendingMode = osg::TexEnv::MODULATE;
osg::TexEnv* env = dynamic_cast<osg::TexEnv*>(state->getTextureAttribute(t, osg::StateAttribute::TEXENV) );
if ( env )
{
blendingMode = env->getMode();
if ( blendingMode == osg::TexEnv::BLEND )
{
replacement->getOrCreateUniform( Stringify() << TEXENV_COLOR << t, osg::Uniform::FLOAT_VEC4 )->set( env->getColor() );
}
}
vertHead << "varying " MEDIUMP "vec4 " TEX_COORD << t << ";\n";
vertBody << INDENT << TEX_COORD << t << " = gl_MultiTexCoord" << t << ";\n";
fragHead << "varying " MEDIUMP "vec4 " TEX_COORD << t << ";\n";
if ( dynamic_cast<osg::Texture1D*>(tex) )
{
fragHead << "uniform sampler1D " SAMPLER << t << ";\n";
fragBody << INDENT "texel = texture1D(" SAMPLER << t << ", " TEX_COORD << t << ".x);\n";
replacement->getOrCreateUniform( Stringify() << SAMPLER << t, osg::Uniform::SAMPLER_1D )->set( t );
}
else if ( dynamic_cast<osg::Texture2D*>(tex) )
{
fragHead << "uniform sampler2D " SAMPLER << t << ";\n";
fragBody << INDENT "texel = texture2D(" SAMPLER << t << ", " TEX_COORD << t << ".xy);\n";
replacement->getOrCreateUniform( Stringify() << SAMPLER << t, osg::Uniform::SAMPLER_2D )->set( t );
}
else if ( dynamic_cast<osg::Texture3D*>(tex) )
{
fragHead << "uniform sampler3D " SAMPLER << t << ";\n";
fragBody << INDENT "texel = texture3D(" SAMPLER << t << ", " TEX_COORD << t << ".xyz);\n";
replacement->getOrCreateUniform( Stringify() << SAMPLER << t, osg::Uniform::SAMPLER_3D )->set( t );
}
// See http://www.opengl.org/sdk/docs/man/xhtml/glTexEnv.xml
switch( blendingMode )
{
case osg::TexEnv::REPLACE:
fragBody
<< INDENT "color = texel; \n";
break;
case osg::TexEnv::MODULATE:
fragBody
<< INDENT "color = color * texel; \n";
break;
case osg::TexEnv::DECAL:
fragBody
<< INDENT "color.rgb = color.rgb * (1.0 - texel.a) + (texel.rgb * texel.a); \n";
break;
case osg::TexEnv::BLEND:
fragHead
<< "uniform " MEDIUMP "vec4 " TEXENV_COLOR << t << "\n;";
fragBody
<< INDENT "color.rgb = color.rgb * (1.0 - texel.rgb) + (" << TEXENV_COLOR << t << ".rgb * texel.rgb); \n"
<< INDENT "color.a = color.a * texel.a; \n";
break;
case osg::TexEnv::ADD:
default:
fragBody
<< INDENT "color.rgb = color.rgb + texel.rgb; \n"
<< INDENT "color.a = color.a * texel.a; \n";
}
}
}
// close out functions:
vertBody << "}\n";
fragBody << "}\n";
// Extract the shader source strings (win compat method)
std::string vertBodySrc, vertSrc, fragBodySrc, fragSrc;
vertBodySrc = vertBody.str();
vertHead << vertBodySrc;
vertSrc = vertHead.str();
fragBodySrc = fragBody.str();
fragHead << fragBodySrc;
fragSrc = fragHead.str();
// inject the shaders:
vp->setFunction( VERTEX_FUNCTION, vertSrc, ShaderComp::LOCATION_VERTEX_PRE_LIGHTING );
vp->setFunction( FRAGMENT_FUNCTION, fragSrc, ShaderComp::LOCATION_FRAGMENT_PRE_LIGHTING );
}
return replacement.valid();
}
// 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;
}
}
osg::Node*
createFramebufferPass(App& app)
{
osg::Node* quad = createFramebufferQuad(app);
osg::StateSet* stateset = quad->getOrCreateStateSet();
static const char* vertSource =
"varying vec4 texcoord;\n"
"void effect_vert(inout vec4 vertexView)\n"
"{\n"
" texcoord = gl_MultiTexCoord0; \n"
"}\n";
static const char* fragSource =
"#version 120\n"
"#extension GL_ARB_texture_rectangle : enable\n"
"uniform sampler2DRect gcolor;\n"
"uniform sampler2DRect gnormal;\n"
"uniform sampler2DRect gdepth;\n"
"varying vec4 texcoord;\n"
"void effect_frag(inout vec4 color)\n"
"{\n"
" color = texture2DRect(gcolor, texcoord.st); \n"
" float depth = texture2DRect(gdepth, texcoord.st).r; \n"
" vec3 normal = texture2DRect(gnormal,texcoord.st).xyz *2.0-1.0; \n"
// sample radius in pixels:
" float e = 5.0; \n"
// sample the normals around our pixel and find the approximate
// deviation from our center normal:
" vec3 avgNormal =\n"
" texture2DRect(gnormal, texcoord.st+vec2( e, e)).xyz + \n"
" texture2DRect(gnormal, texcoord.st+vec2(-e, e)).xyz + \n"
" texture2DRect(gnormal, texcoord.st+vec2(-e,-e)).xyz + \n"
" texture2DRect(gnormal, texcoord.st+vec2( e,-e)).xyz + \n"
" texture2DRect(gnormal, texcoord.st+vec2( 0, e)).xyz + \n"
" texture2DRect(gnormal, texcoord.st+vec2( e, 0)).xyz + \n"
" texture2DRect(gnormal, texcoord.st+vec2( 0,-e)).xyz + \n"
" texture2DRect(gnormal, texcoord.st+vec2(-e, 0)).xyz; \n"
" avgNormal = normalize((avgNormal/8.0)*2.0-1.0); \n"
" float deviation = clamp(dot(normal, avgNormal),0.0,1.0); \n"
// set a blur factor based on the normal deviation, so that we
// blur more around edges.
" e = 2.5 * (1.0-deviation); \n"
" vec4 blurColor = \n"
" color + \n"
" texture2DRect(gcolor, texcoord.st+vec2( e, e)) + \n"
" texture2DRect(gcolor, texcoord.st+vec2(-e, e)) + \n"
" texture2DRect(gcolor, texcoord.st+vec2(-e,-e)) + \n"
" texture2DRect(gcolor, texcoord.st+vec2( e,-e)) + \n"
" texture2DRect(gcolor, texcoord.st+vec2( 0, e)) + \n"
" texture2DRect(gcolor, texcoord.st+vec2( e, 0)) + \n"
" texture2DRect(gcolor, texcoord.st+vec2( 0,-e)) + \n"
" texture2DRect(gcolor, texcoord.st+vec2(-e, 0)); \n"
" blurColor /= 9.0; \n"
// blur the color and darken the edges at the same time
" color.rgb = blurColor.rgb * deviation; \n"
"}\n";
VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);
vp->setFunction("effect_vert", vertSource, ShaderComp::LOCATION_VERTEX_VIEW);
vp->setFunction("effect_frag", fragSource, ShaderComp::LOCATION_FRAGMENT_COLORING);
stateset->setTextureAttributeAndModes(0, app.gcolor, 1);
stateset->addUniform(new osg::Uniform("gcolor", 0));
stateset->setTextureAttributeAndModes(1, app.gnormal, 1);
stateset->addUniform(new osg::Uniform("gnormal", 1));
stateset->setTextureAttributeAndModes(2, app.gdepth, 1);
stateset->addUniform(new osg::Uniform("gdepth", 2));
stateset->setMode( GL_LIGHTING, 0 );
float w = app.gcolor->getTextureWidth();
float h = app.gcolor->getTextureHeight();
osg::Camera* camera = new osg::Camera();
camera->setReferenceFrame( osg::Transform::ABSOLUTE_RF );
camera->setViewMatrix( osg::Matrix::identity() );
camera->setProjectionMatrixAsOrtho2D( -w/2, (-w/2)+w, -h/2, (-h/2)+h );
camera->addChild( quad );
return camera;
}