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ODGauge/Canvas: add option "additive-blend" to use additive alpha blending

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This commit is contained in:
Thomas Geymayer 2013-02-28 22:02:11 +01:00
parent ad7d6624de
commit 1240807b9f
3 changed files with 78 additions and 40 deletions
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4
simgear/canvas/Canvas.cxx
View File

@ -445,6 +445,10 @@ namespace canvas
{
_sampling_dirty = true;
}
else if( node->getNameString() == "additive-blend" )
{
_texture.useAdditiveBlend( node->getBoolValue() );
}
else if( node->getNameString() == "render-always" )
{
_render_always = node->getBoolValue();

82
simgear/canvas/ODGauge.cxx
View File

@ -57,12 +57,9 @@ namespace canvas
_size_y( -1 ),
_view_width( -1 ),
_view_height( -1 ),
_use_image_coords( false ),
_use_stencil( false ),
_use_mipmapping( false ),
_flags(0),
_coverage_samples( 0 ),
_color_samples( 0 ),
rtAvailable( false )
_color_samples( 0 )
{
}
@ -104,39 +101,34 @@ namespace canvas
//----------------------------------------------------------------------------
void ODGauge::useImageCoords(bool use)
{
if( use == _use_image_coords )
return;
_use_image_coords = use;
if( texture )
if( updateFlag(USE_IMAGE_COORDS, use) && texture )
updateCoordinateFrame();
}
//----------------------------------------------------------------------------
void ODGauge::useStencil(bool use)
{
if( use == _use_stencil )
return;
_use_stencil = use;
if( texture )
if( updateFlag(USE_STENCIL, use) && texture )
updateStencil();
}
//----------------------------------------------------------------------------
void ODGauge::useAdditiveBlend(bool use)
{
if( updateFlag(USE_ADDITIVE_BLEND, use) && camera )
updateBlendMode();
}
//----------------------------------------------------------------------------
void ODGauge::setSampling( bool mipmapping,
int coverage_samples,
int color_samples )
{
if( _use_mipmapping == mipmapping
if( !updateFlag(USE_MIPMAPPING, mipmapping)
&& _coverage_samples == coverage_samples
&& _color_samples == color_samples )
return;
_use_mipmapping = mipmapping;
if( color_samples > coverage_samples )
{
SG_LOG
@ -164,7 +156,7 @@ namespace canvas
//----------------------------------------------------------------------------
bool ODGauge::serviceable(void)
{
return rtAvailable;
return _flags & AVAILABLE;
}
//----------------------------------------------------------------------------
@ -196,13 +188,10 @@ namespace canvas
osg::PolygonMode::FILL ),
osg::StateAttribute::ON );
stateSet->setAttributeAndModes(
new osg::AlphaFunc(osg::AlphaFunc::GREATER, 0.0f),
new osg::AlphaFunc(osg::AlphaFunc::GREATER, 0.001f),
osg::StateAttribute::ON );
stateSet->setAttribute(new osg::ShadeModel(osg::ShadeModel::FLAT));
stateSet->setAttributeAndModes(
new osg::BlendFunc( osg::BlendFunc::SRC_ALPHA,
osg::BlendFunc::ONE_MINUS_SRC_ALPHA),
osg::StateAttribute::ON );
if( !texture )
{
texture = new osg::Texture2D;
@ -211,11 +200,12 @@ namespace canvas
}
updateSampling();
updateBlendMode();
if( _system_adapter )
_system_adapter->addCamera(camera.get());
rtAvailable = true;
_flags |= AVAILABLE;
}
//----------------------------------------------------------------------------
@ -234,7 +224,17 @@ namespace canvas
camera.release();
texture.release();
rtAvailable = false;
_flags &= ~AVAILABLE;
}
//----------------------------------------------------------------------------
bool ODGauge::updateFlag(Flags flag, bool enable)
{
if( (_flags & flag) == enable )
return false;
_flags ^= flag;
return true;
}
//----------------------------------------------------------------------------
@ -249,7 +249,7 @@ namespace canvas
camera->setViewport(0, 0, _size_x, _size_y);
if( _use_image_coords )
if( _flags & USE_IMAGE_COORDS )
camera->setProjectionMatrix(
osg::Matrix::ortho2D(0, _view_width, _view_height, 0)
);
@ -267,7 +267,7 @@ namespace canvas
GLbitfield mask = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT;
if( _use_stencil)
if( _flags & USE_STENCIL )
{
camera->attach( osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
GL_DEPTH_STENCIL_EXT );
@ -289,18 +289,36 @@ namespace canvas
texture->setFilter(
osg::Texture2D::MIN_FILTER,
_use_mipmapping ? osg::Texture2D::LINEAR_MIPMAP_LINEAR
(_flags & USE_MIPMAPPING) ? osg::Texture2D::LINEAR_MIPMAP_LINEAR
: osg::Texture2D::LINEAR
);
camera->attach(
osg::Camera::COLOR_BUFFER,
texture.get(),
0, 0,
_use_mipmapping,
_flags & USE_MIPMAPPING,
_coverage_samples,
_color_samples
);
}
//----------------------------------------------------------------------------
void ODGauge::updateBlendMode()
{
assert( camera );
camera->getOrCreateStateSet()
->setAttributeAndModes
(
(_flags & USE_ADDITIVE_BLEND)
? new osg::BlendFunc( osg::BlendFunc::SRC_ALPHA,
osg::BlendFunc::ONE_MINUS_SRC_ALPHA,
osg::BlendFunc::ONE,
osg::BlendFunc::ONE )
: new osg::BlendFunc( osg::BlendFunc::SRC_ALPHA,
osg::BlendFunc::ONE_MINUS_SRC_ALPHA )
);
}
} // namespace canvas
} // namespace simgear

24
simgear/canvas/ODGauge.hxx
View File

@ -91,6 +91,12 @@ namespace canvas
*/
void useStencil(bool use = true);
/**
* Enable/Disable additive alpha blending (Can improve results with
* transparent background)
*/
void useAdditiveBlend(bool use = true);
/**
* Set sampling parameters for mipmapping and coverage sampling
* antialiasing.
@ -134,21 +140,31 @@ namespace canvas
_size_y,
_view_width,
_view_height;
bool _use_image_coords,
_use_stencil,
_use_mipmapping;
enum Flags
{
AVAILABLE = 1,
USE_IMAGE_COORDS = AVAILABLE << 1,
USE_STENCIL = USE_IMAGE_COORDS << 1,
USE_MIPMAPPING = USE_STENCIL << 1,
USE_ADDITIVE_BLEND = USE_MIPMAPPING << 1
};
uint32_t _flags;
// Multisampling parameters
int _coverage_samples,
_color_samples;
bool rtAvailable;
osg::ref_ptr<osg::Camera> camera;
osg::ref_ptr<osg::Texture2D> texture;
bool updateFlag(Flags flag, bool enable);
void updateCoordinateFrame();
void updateStencil();
void updateSampling();
void updateBlendMode();
};