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Implement clipping of snow flakes in fragment shader. This fixes painting the flakes several times in multi screen setup as well as during active desktop grid effect. Also honour translations and scaling of the desktop and re-enabling snow during active full screen effect.

Browse source 
BUG: 176489

svn path=/trunk/KDE/kdebase/workspace/; revision=892202
This commit is contained in:
Martin Gräßlin 2008-12-03 19:46:20 +00:00
parent bc5bd54bd1
commit 3150cb2631
2 changed files with 44 additions and 4 deletions
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8
effects/data/snow.frag
View file

@ -18,8 +18,16 @@ You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
uniform sampler2D snowTexture;
uniform int left;
uniform int right;
uniform int top;
uniform int bottom;
void main()
{
gl_FragColor = texture2D( snowTexture, gl_TexCoord[0].st );
// manual clipping
if( gl_FragCoord.x < float( left ) || gl_FragCoord.x > float( right )
|| gl_FragCoord.y < float( top ) || gl_FragCoord.y > float( bottom ) )
discard;
}

40
effects/snow.cpp
View file

@ -82,7 +82,7 @@ void SnowEffect::reconfigure( ReconfigureFlags )
void SnowEffect::prePaintScreen( ScreenPrePaintData& data, int time )
{
if ( active && effects->activeFullScreenEffect() == NULL )
if ( active )
{
// if number of active snowflakes is smaller than maximum number
// create a random new snowflake
@ -118,8 +118,6 @@ void SnowEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
void SnowEffect::snowing( QRegion& region )
{
if( effects->activeFullScreenEffect() != NULL )
return;
if(! texture ) loadTexture();
if( texture )
{
@ -134,6 +132,11 @@ void SnowEffect::snowing( QRegion& region )
if( mUseShader )
{
mShader->bind();
QRect rect = region.boundingRect();
mShader->setUniform( "left", rect.x() );
mShader->setUniform( "right", rect.x() + rect.width() );
mShader->setUniform( "top", rect.y() );
mShader->setUniform( "bottom", rect.y() + rect.height() );
}
else
glNewList( list, GL_COMPILE_AND_EXECUTE );
@ -222,7 +225,36 @@ void SnowEffect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowP
}
effects->paintWindow( w, mask, region, data );
if( active && w->isDesktop() && snowBehindWindows )
snowing( region );
{
QRect rect = effects->clientArea( FullScreenArea, w->screen(), effects->currentDesktop());
QRegion snowRegion( rect.x() + data.xTranslate, rect.y() + data.yTranslate,
(double)rect.width()*data.xScale, (double)rect.height()*data.yScale);
if( mUseShader )
{
// have to adjust the y values to fit OpenGL
// in OpenGL y==0 is at bottom, in Qt at top
int y = 0;
if( effects->numScreens() > 1 )
{
QRect fullArea = effects->clientArea( FullArea, 0, 1 );
if( fullArea.height() != rect.height() )
{
if( rect.y() == 0 )
y = fullArea.height() - rect.height();
else
y = fullArea.height() - rect.y() - rect.height();
}
}
snowRegion = QRegion( rect.x() + data.xTranslate,
y + rect.height() - data.yTranslate - (double)rect.height()*data.yScale,
(double)rect.width()*data.xScale, (double)rect.height()*data.yScale);
}
glPushMatrix();
glTranslatef( rect.x() + data.xTranslate, rect.y() + data.yTranslate, 0.0 );
glScalef( data.xScale, data.yScale, 1.0 );
snowing( snowRegion );
glPopMatrix();
}
}
void SnowEffect::toggle()