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Reflection plane in cube effect and GLSL

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This commit is contained in:
Martin Gräßlin 2010-12-20 21:21:41 +01:00
parent ad070909a3
commit e5b6baeda9
4 changed files with 65 additions and 15 deletions
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1
effects/cube/CMakeLists.txt
View file

@ -16,6 +16,7 @@ install( FILES
# Data files
install( FILES
cube/data/cube-reflection.glsl
cube/data/cubecap.png
cube/data/cylinder.frag
cube/data/cylinder.vert

70
effects/cube/cube.cpp
View file

@ -97,6 +97,9 @@ CubeEffect::CubeEffect()
desktopNameFont.setPointSize( 14 );
desktopNameFrame->setFont( desktopNameFont );
const QString fragmentshader = KGlobal::dirs()->findResource("data", "kwin/cube-reflection.glsl");
m_reflectionShader = ShaderManager::instance()->loadFragmentShader(ShaderManager::GenericShader, fragmentshader);
reconfigure( ReconfigureAll );
}
@ -252,6 +255,7 @@ CubeEffect::~CubeEffect()
delete cylinderShader;
delete sphereShader;
delete desktopNameFrame;
delete m_reflectionShader;
}
bool CubeEffect::loadShader()
@ -551,12 +555,9 @@ void CubeEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
#ifndef KWIN_HAVE_OPENGLES
// TODO: find a solution for GLES
glDisable( GL_CLIP_PLANE0 );
glPopMatrix();
#endif
#ifndef KWIN_HAVE_OPENGLES
glPopMatrix();
glPushMatrix();
glTranslatef( rect.x() + rect.width()*0.5f, 0.0, 0.0 );
float vertices[] = {
-rect.width()*0.5f, rect.height(), 0.0,
rect.width()*0.5f, rect.height(), 0.0,
@ -568,18 +569,57 @@ void CubeEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
alpha = 0.3 + 0.4 * timeLine.value();
if( stop )
alpha = 0.3 + 0.4 * ( 1.0 - timeLine.value() );
glColor4f( 0.0, 0.0, 0.0, alpha );
glBegin( GL_POLYGON );
glVertex3f( vertices[0], vertices[1], vertices[2] );
glVertex3f( vertices[3], vertices[4], vertices[5] );
// rearground
alpha = -1.0;
glColor4f( 0.0, 0.0, 0.0, alpha );
glVertex3f( vertices[6], vertices[7], vertices[8] );
glVertex3f( vertices[9], vertices[10], vertices[11] );
glEnd();
glPopMatrix();
ShaderManager *shaderManager = ShaderManager::instance();
if (shaderManager->isValid() && m_reflectionShader->isValid()) {
// ensure blending is enabled - no attribute stack
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
shaderManager->pushShader(m_reflectionShader);
QMatrix4x4 windowTransformation;
windowTransformation.translate(rect.x() + rect.width()*0.5f, 0.0, 0.0);
m_reflectionShader->setUniform("windowTransformation", windowTransformation);
m_reflectionShader->setUniform("u_alpha", alpha);
QVector<float> verts;
QVector<float> texcoords;
verts.reserve(18);
texcoords.reserve(12);
texcoords << 0.0 << 0.0;
verts << vertices[6] << vertices[7] << vertices[8];
texcoords << 0.0 << 0.0;
verts << vertices[9] << vertices[10] << vertices[11];
texcoords << 1.0 << 0.0;
verts << vertices[0] << vertices[1] << vertices[2];
texcoords << 1.0 << 0.0;
verts << vertices[0] << vertices[1] << vertices[2];
texcoords << 1.0 << 0.0;
verts << vertices[3] << vertices[4] << vertices[5];
texcoords << 0.0 << 0.0;
verts << vertices[6] << vertices[7] << vertices[8];
GLVertexBuffer *vbo = GLVertexBuffer::streamingBuffer();
vbo->reset();
vbo->setUseShader(true);
vbo->setData(6, 3, verts.data(), texcoords.data());
vbo->render(GL_TRIANGLES);
shaderManager->popShader();
glDisable( GL_BLEND );
} else {
#ifndef KWIN_HAVE_OPENGLES
glColor4f( 0.0, 0.0, 0.0, alpha );
glPushMatrix();
glTranslatef( rect.x() + rect.width()*0.5f, 0.0, 0.0 );
glBegin( GL_POLYGON );
glVertex3f( vertices[0], vertices[1], vertices[2] );
glVertex3f( vertices[3], vertices[4], vertices[5] );
// rearground
alpha = -1.0;
glColor4f( 0.0, 0.0, 0.0, alpha );
glVertex3f( vertices[6], vertices[7], vertices[8] );
glVertex3f( vertices[9], vertices[10], vertices[11] );
glEnd();
glPopMatrix();
#endif
}
PaintClipper::pop( QRegion( rect ));
}
glEnable( GL_CULL_FACE );

1
effects/cube/cube.h
View file

@ -156,6 +156,7 @@ class CubeEffect
bool useShaders;
GLShader* cylinderShader;
GLShader* sphereShader;
GLShader* m_reflectionShader;
float capDeformationFactor;
bool useZOrdering;
float zOrderingFactor;

8
effects/cube/data/cube-reflection.glsl Normal file
View file

@ -0,0 +1,8 @@
uniform float u_alpha;
varying vec2 varyingTexCoords;
void main()
{
gl_FragColor = vec4(0.0, 0.0, 0.0, u_alpha*varyingTexCoords.s);
}