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Add a hacky temporary version of cascading shadow maps

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This commit is contained in:
AnyOldName3 2018-05-13 12:56:40 +01:00
parent 44b2cf2b7f
commit 1b30d47d7f
2 changed files with 21 additions and 10 deletions
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29
components/sceneutil/mwshadowtechnique.cpp
View File

@ -149,7 +149,7 @@ std::string debugFrustumFragmentShaderSource =
" \n"
" gl_FragColor = vec4( fS + fH * color, 1 ); \n"
#else
" gl_FragColor = texture2D(texture, gl_TexCoord[0].xy); \n"
" gl_FragColor = vec4(0.0, 0.0, 1.0, 0.0); \n"
#endif
"} \n";
@ -1130,7 +1130,8 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
osg::Polytope local_polytope(polytope);
local_polytope.transformProvidingInverse(invertModelView);
double cascaseNear = reducedNear;
double cascadeFar = reducedFar;
if (numShadowMapsPerLight>1)
{
// compute the start and end range in non-dimensional coords
@ -1158,6 +1159,7 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
double ciLog = n * pow(f / n, i / m);
double ciUniform = n + (f - n) * i / m;
double ci = _splitPointUniformLogRatio * ciLog + (1.0 - _splitPointUniformLogRatio) * ciUniform + _splitPointDeltaBias;
cascaseNear = ci;
// work out where this is in light space
osg::Vec3d worldSpacePos = frustum.eye + frustum.frustumCenterLine * ci;
@ -1173,7 +1175,8 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
double ciLog = n * pow(f / n, (i + 1) / m);
double ciUniform = n + (f - n) * (i + 1) / m;
double ci = _splitPointUniformLogRatio * ciLog + (1.0 - _splitPointUniformLogRatio) * ciUniform + _splitPointDeltaBias;
cascadeFar = ci;
// work out where this is in light space
osg::Vec3d worldSpacePos = frustum.eye + frustum.frustumCenterLine * ci;
osg::Vec3d lightSpacePos = worldSpacePos * viewMatrix * projectionMatrix;
@ -1185,7 +1188,7 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
if (sm_i+1<numShadowMapsPerLight) r_end+=0.01;
if (sm_i>0)
if (false)//(sm_i>0)
{
// not the first shadowmap so insert a polytope to clip the scene from before r_start
@ -1200,7 +1203,7 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
}
if (sm_i+1<numShadowMapsPerLight)
if (false)//(sm_i+1<numShadowMapsPerLight)
{
// not the last shadowmap so insert a polytope to clip the scene from beyond r_end
@ -1225,11 +1228,11 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
// OSG_NOTICE<<" mid_r = "<<mid_r<<", range_r = "<<range_r<<std::endl;
camera->setProjectionMatrix(
/*camera->setProjectionMatrix(
camera->getProjectionMatrix() *
osg::Matrixd::translate(osg::Vec3d(0.0,-mid_r,0.0)) *
osg::Matrixd::scale(osg::Vec3d(1.0,2.0/range_r,1.0)));
*/
}
@ -1247,7 +1250,7 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
if (!orthographicViewFrustum && settings->getShadowMapProjectionHint()==ShadowSettings::PERSPECTIVE_SHADOW_MAP)
{
adjustPerspectiveShadowMapCameraSettings(vdsmCallback->getRenderStage(), frustum, pl, camera.get());
adjustPerspectiveShadowMapCameraSettings(vdsmCallback->getRenderStage(), frustum, pl, camera.get(), cascaseNear, cascadeFar);
if (vdsmCallback->getProjectionMatrix())
{
vdsmCallback->getProjectionMatrix()->set(camera->getProjectionMatrix());
@ -2149,7 +2152,7 @@ struct RenderLeafBounds
double min_z, max_z;
};
bool MWShadowTechnique::adjustPerspectiveShadowMapCameraSettings(osgUtil::RenderStage* renderStage, Frustum& frustum, LightData& /*positionedLight*/, osg::Camera* camera)
bool MWShadowTechnique::adjustPerspectiveShadowMapCameraSettings(osgUtil::RenderStage* renderStage, Frustum& frustum, LightData& /*positionedLight*/, osg::Camera* camera, double viewNear, double viewFar)
{
const ShadowSettings* settings = getShadowedScene()->getShadowSettings();
@ -2177,6 +2180,14 @@ bool MWShadowTechnique::adjustPerspectiveShadowMapCameraSettings(osgUtil::Render
ConvexHull convexHull;
convexHull.setToFrustum(frustum);
osg::Vec3d nearPoint = frustum.eye + frustum.frustumCenterLine * viewNear;
osg::Vec3d farPoint = frustum.eye + frustum.frustumCenterLine * viewFar;
double nearDist = frustum.frustumCenterLine.x() * nearPoint.x() + frustum.frustumCenterLine.y() * nearPoint.y() + frustum.frustumCenterLine.z() * nearPoint.z();
double farDist = -frustum.frustumCenterLine.x() * farPoint.x() - frustum.frustumCenterLine.y() * farPoint.y() - frustum.frustumCenterLine.z() * farPoint.z();
convexHull.clip(osg::Plane(frustum.frustumCenterLine, -nearDist));
convexHull.clip(osg::Plane(-frustum.frustumCenterLine, -farDist));
#if 0
OSG_NOTICE<<"ws ConvexHull xMin="<<convexHull.min(0)<<", xMax="<<convexHull.max(0)<<std::endl;
OSG_NOTICE<<"ws ConvexHull yMin="<<convexHull.min(1)<<", yMax="<<convexHull.max(1)<<std::endl;

2
components/sceneutil/mwshadowtechnique.hpp
View File

@ -205,7 +205,7 @@ namespace SceneUtil {
virtual bool computeShadowCameraSettings(Frustum& frustum, LightData& positionedLight, osg::Matrixd& projectionMatrix, osg::Matrixd& viewMatrix);
virtual bool adjustPerspectiveShadowMapCameraSettings(osgUtil::RenderStage* renderStage, Frustum& frustum, LightData& positionedLight, osg::Camera* camera);
virtual bool adjustPerspectiveShadowMapCameraSettings(osgUtil::RenderStage* renderStage, Frustum& frustum, LightData& positionedLight, osg::Camera* camera, double viewNear, double viewFar);
virtual bool assignTexGenSettings(osgUtil::CullVisitor* cv, osg::Camera* camera, unsigned int textureUnit, osg::TexGen* texgen);