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Compositor: add new uniforms

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Provide the sunlight direction in view and world space and the near/far distance given by the CameraGroup.
This commit is contained in:
Fernando García Liñán 2021-07-26 12:04:56 +02:00
parent 420555c69c
commit 908dc467a8
2 changed files with 24 additions and 7 deletions
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27
simgear/scene/viewer/Compositor.cxx
View File

@ -34,11 +34,13 @@
#include "CompositorUtil.hxx"
class SunDirectionCallback : public osg::Uniform::Callback {
class SunDirectionWorldCallback : public osg::Uniform::Callback {
public:
virtual void operator()(osg::Uniform *uniform, osg::NodeVisitor *nv) {
SGUpdateVisitor *uv = dynamic_cast<SGUpdateVisitor *>(nv);
uniform->set(toOsg(uv->getLightDirection()));
osg::Vec3f l = toOsg(uv->getLightDirection());
l.normalize();
uniform->set(l);
}
};
@ -138,12 +140,14 @@ Compositor::Compositor(osg::View *view,
new osg::Uniform("fg_PrevProjectionMatrixInverse", osg::Matrixf()),
new osg::Uniform("fg_CameraPositionCart", osg::Vec3f()),
new osg::Uniform("fg_CameraPositionGeod", osg::Vec3f()),
new osg::Uniform("fg_NearFarPlanes", osg::Vec3f()),
new osg::Uniform("fg_NearFar", osg::Vec2f()),
new osg::Uniform("fg_Planes", osg::Vec3f()),
new osg::Uniform("fg_Fcoef", 0.0f),
new osg::Uniform("fg_SunDirection", osg::Vec3f())
new osg::Uniform("fg_SunDirection", osg::Vec3f()),
new osg::Uniform("fg_SunDirectionWorld", osg::Vec3f()),
}
{
_uniforms[SUN_DIRECTION]->setUpdateCallback(new SunDirectionCallback);
_uniforms[SUN_DIRECTION_WORLD]->setUpdateCallback(new SunDirectionWorldCallback);
}
Compositor::~Compositor()
@ -186,6 +190,11 @@ Compositor::update(const osg::Matrix &view_matrix,
_uniforms[PREV_PROJECTION_MATRIX]->set(prev_proj_matrix);
_uniforms[PREV_PROJECTION_MATRIX_INV]->set(prev_proj_matrix_inv);
osg::Vec3f sun_dir_world;
_uniforms[SUN_DIRECTION_WORLD]->get(sun_dir_world);
osg::Vec4f sun_dir_view = osg::Vec4f(
sun_dir_world.x(), sun_dir_world.y(), sun_dir_world.z(), 0.0f) * view_matrix;
for (int i = 0; i < TOTAL_BUILTIN_UNIFORMS; ++i) {
osg::ref_ptr<osg::Uniform> u = _uniforms[i];
switch (i) {
@ -212,9 +221,15 @@ Compositor::update(const osg::Matrix &view_matrix,
camera_pos_geod.getLatitudeRad(),
camera_pos_geod.getElevationM()));
break;
case NEAR_FAR_PLANES:
case NEAR_FAR:
u->set(osg::Vec2f(zNear, zFar));
break;
case PLANES:
u->set(osg::Vec3f(-zFar, -zFar * zNear, zFar - zNear));
break;
case SUN_DIRECTION:
u->set(osg::Vec3f(sun_dir_view.x(), sun_dir_view.y(), sun_dir_view.z()));
break;
case FCOEF:
if (zFar != 0.0)
u->set(2.0f / log2(float(zFar) + 1.0f));

4
simgear/scene/viewer/Compositor.hxx
View File

@ -57,9 +57,11 @@ public:
PREV_PROJECTION_MATRIX_INV,
CAMERA_POSITION_CART,
CAMERA_POSITION_GEOD,
NEAR_FAR_PLANES,
NEAR_FAR,
PLANES,
FCOEF,
SUN_DIRECTION,
SUN_DIRECTION_WORLD,
TOTAL_BUILTIN_UNIFORMS
};