void ShaderEffect::draw (QPainter *painter)
{
const QGLContext *context = QGLContext::currentContext();
prepareBufferedDraw(painter);
if (context) {
updateRenderTargets();
}
if (!context || m_renderTargets.count() == 0 || !hideOriginal())
drawSource(painter);
}
void ShaderShadowMapEngine::handleSpotLightEnter(
SpotLight *spotL, RenderAction *ract, SSMEngineData *data)
{
RenderPartition *parentPart = ract->getActivePartition();
// Real cosSpotCutOff = osgCos(spotL->getSpotCutOff());
Matrix matEyeToWorld (parentPart->getCameraToWorld());
Matrix matWorldToLight;
Matrix matEyeToLight;
calcSpotLightMatrices(matWorldToLight, matEyeToLight,
spotL, matEyeToWorld );
Real32 lightNear;
Real32 lightFar;
calcPointLightRange(spotL, 0.001f,
parentPart->getNear(), parentPart->getFar(),
lightNear, lightFar );
if(getShadowNear() != 0.f)
{
lightNear = getShadowNear();
}
if(getShadowFar() != 0.f)
{
lightFar = getShadowFar();
}
Matrix matLightProj;
Matrix matLightProjTrans;
MatrixPerspective(matLightProj,
spotL->getSpotCutOff(), 1.f,
lightNear, lightFar );
updateShadowTexImage (data);
updateShadowTexBuffers(data);
updateRenderTargets (data);
Int32 shadowTexUnit = (this->getForceTextureUnit() > 0) ?
this->getForceTextureUnit() : 7;
ShaderProgram *shadowFP = this->getShadowFragmentProgram();
if(shadowFP == NULL)
{
ShaderProgramUnrecPtr newShadowFP = ShaderProgram::createLocal();
newShadowFP->setShaderType(GL_FRAGMENT_SHADER);
newShadowFP->setProgram (_spotFPCode );
newShadowFP->addUniformVariable("SSME_matEyeToLight", matEyeToLight);
newShadowFP->addUniformVariable("SSME_matLightProj", matLightProj );
newShadowFP->addUniformVariable("SSME_texShadow", shadowTexUnit);
this->setShadowFragmentProgram(newShadowFP);
shadowFP = newShadowFP;
}
else
{
shadowFP->updateUniformVariable("SSME_matEyeToLight", matEyeToLight);
shadowFP->updateUniformVariable("SSME_matLightProj", matLightProj );
}
commitChanges();
this->pushPartition(ract);
{
RenderPartition *part = ract->getActivePartition( );
Window *win = ract->getWindow ( );
FrameBufferObject *target = data->getRenderTargets (0);
Background *back = data->getBackground ( );
part->setRenderTarget(target);
part->setWindow (win );
part->calcViewportDimension(0.f, 0.f, 1.f, 1.f,
target->getWidth (),
target->getHeight() );
part->setupProjection(matLightProj, matLightProjTrans);
part->setupViewing (matWorldToLight );
part->setNear (parentPart->getNear());
part->setFar (parentPart->getFar ());
part->calcFrustum ( );
part->setBackground (back );
// force material for shadow map generation
part->overrideMaterial(data->getLightPassMaterials(0),
ract->getActNode ( ) );
this->recurseFrom(ract, spotL);
ract->useNodeList(false );
// undo override
part->overrideMaterial(NULL,
ract->getActNode ( ) );
}
this->popPartition(ract);
}
void ShaderShadowMapEngine::handleDirectionalLightEnter(
DirectionalLight *dirL, RenderAction *ract, SSMEngineData *data)
{
RenderPartition *parentPart = ract ->getActivePartition();
FrustumVolume camFrust = parentPart->getFrustum ();
Matrix matEyeToWorld (parentPart->getCameraToWorld());
Matrix matWorldToLight;
Matrix matEyeToLight;
calcDirectionalLightMatrices(matWorldToLight, matEyeToLight,
dirL, matEyeToWorld );
// place light camera outside the scene bounding box:
// - project camera frustum and scene bounding box into a
// coordinate system where the directional light shines
// along the -z axis.
// - compute 2 AABBs that contain the projected frustum and
// scene BB
// - width and height of the ortho projection are determined from
// the frustum AABB, while near and far are determined by the
// scene AABB (offscreen objects cast shadows into the view volume)
Pnt3f camVerts [10];
Pnt3f sceneVerts[10];
const Matrix &matSceneToWorld = ract->topMatrix ();
BoxVolume sceneBB = ract->getActNode()->getVolume();
camFrust.getCorners(camVerts [0], camVerts [1],
camVerts [2], camVerts [3],
camVerts [4], camVerts [5],
camVerts [6], camVerts [7] );
sceneBB .getCorners(sceneVerts[0], sceneVerts[1],
sceneVerts[2], sceneVerts[3],
sceneVerts[4], sceneVerts[5],
sceneVerts[6], sceneVerts[7] );
camVerts [8].setValues(TypeTraits<Real32>::getMax(),
TypeTraits<Real32>::getMax(),
TypeTraits<Real32>::getMax() );
camVerts [9].setValues(TypeTraits<Real32>::getMin(),
TypeTraits<Real32>::getMin(),
TypeTraits<Real32>::getMin() );
sceneVerts[8].setValues(TypeTraits<Real32>::getMax(),
TypeTraits<Real32>::getMax(),
TypeTraits<Real32>::getMax() );
sceneVerts[9].setValues(TypeTraits<Real32>::getMin(),
TypeTraits<Real32>::getMin(),
TypeTraits<Real32>::getMin() );
for(UInt32 i = 0; i < 8; ++i)
{
matWorldToLight.mult(camVerts [i], camVerts [i]);
matSceneToWorld.mult(sceneVerts[i], sceneVerts[i]);
matWorldToLight.mult(sceneVerts[i], sceneVerts[i]);
camVerts [8][0] = osgMin(camVerts [8][0], camVerts [i][0]);
camVerts [9][0] = osgMax(camVerts [9][0], camVerts [i][0]);
camVerts [8][1] = osgMin(camVerts [8][1], camVerts [i][1]);
camVerts [9][1] = osgMax(camVerts [9][1], camVerts [i][1]);
sceneVerts[8][0] = osgMin(sceneVerts[8][0], sceneVerts[i][0]);
sceneVerts[9][0] = osgMax(sceneVerts[9][0], sceneVerts[i][0]);
sceneVerts[8][1] = osgMin(sceneVerts[8][1], sceneVerts[i][1]);
sceneVerts[9][1] = osgMax(sceneVerts[9][1], sceneVerts[i][1]);
sceneVerts[8][2] = osgMin(sceneVerts[8][2], sceneVerts[i][2]);
sceneVerts[9][2] = osgMax(sceneVerts[9][2], sceneVerts[i][2]);
}
// these points are the corners of the ortho shadow view volume
Pnt3f lightMin(osgMax(camVerts[8][0], sceneVerts[8][0]),
osgMax(camVerts[8][1], sceneVerts[8][1]),
-sceneVerts[9][2]);
Pnt3f lightMax(osgMin(camVerts[9][0], sceneVerts[9][0]),
osgMin(camVerts[9][1], sceneVerts[9][1]),
-sceneVerts[8][2]);
// enlarge by 2% in x, y, z direction
lightMin[0] -= (lightMax[0] - lightMin[0]) * 0.01f;
lightMin[1] -= (lightMax[1] - lightMin[1]) * 0.01f;
lightMin[2] -= (lightMax[2] - lightMin[2]) * 0.01f;
lightMax[0] += (lightMax[0] - lightMin[0]) * 0.01f;
lightMax[1] += (lightMax[1] - lightMin[1]) * 0.01f;
lightMax[2] += (lightMax[2] - lightMin[2]) * 0.01f;
Matrix matLightProj;
Matrix matLightProjTrans;
MatrixOrthogonal(matLightProj,
lightMin[0], lightMax[0],
lightMin[1], lightMax[1],
lightMin[2], lightMax[2] );
updateShadowTexImage (data);
updateShadowTexBuffers(data);
updateRenderTargets (data);
Int32 shadowTexUnit = (this->getForceTextureUnit() > 0) ?
this->getForceTextureUnit() : 7;
ShaderProgram *shadowFP = this->getShadowFragmentProgram();
if(shadowFP == NULL)
{
ShaderProgramUnrecPtr newShadowFP = ShaderProgram::createLocal();
newShadowFP->setShaderType(GL_FRAGMENT_SHADER);
newShadowFP->setProgram (_dirFPCode );
newShadowFP->addUniformVariable("SSME_matEyeToLight", matEyeToLight);
newShadowFP->addUniformVariable("SSME_matLightProj", matLightProj );
newShadowFP->addUniformVariable("SSME_texShadow", shadowTexUnit);
this->setShadowFragmentProgram(newShadowFP);
shadowFP = newShadowFP;
}
else
{
shadowFP->updateUniformVariable("SSME_matEyeToLight", matEyeToLight);
shadowFP->updateUniformVariable("SSME_matLightProj", matLightProj );
}
commitChanges();
this->pushPartition(ract);
{
RenderPartition *part = ract->getActivePartition( );
Window *win = ract->getWindow ( );
FrameBufferObject *target = data->getRenderTargets (0);
Background *back = data->getBackground ( );
part->setRenderTarget(target);
part->setWindow (win );
part->calcViewportDimension(0.f, 0.f, 1.f, 1.f,
target->getWidth (),
target->getHeight() );
part->setupProjection(matLightProj, matLightProjTrans);
part->setupViewing (matWorldToLight );
part->setNear (parentPart->getNear());
part->setFar (parentPart->getFar ());
part->calcFrustum ( );
part->setBackground (back );
// force material for shadow map generation
part->overrideMaterial(data->getLightPassMaterials(0),
ract->getActNode ( ) );
this->recurseFrom(ract, dirL);
ract->useNodeList(false );
// undo override
part->overrideMaterial(NULL,
ract->getActNode ( ) );
}
this->popPartition(ract);
}
