- split shadowmap AABB tree into two parts. one for static and one for dynamic

- upload only the dynamic AABB subtree using glBufferSubData
- change internal raytracing stack limit from 16 to 32
- update shadowmap AABB tree after R_SetupFrame for proper frame interpolation

src/gl/system/gl_buffers.cpp

@@ -65,7 +65,7 @@ void GLBuffer::Bind()
 }
 
 
-void GLBuffer::SetData(size_t size, void *data, bool staticdata)
+void GLBuffer::SetData(size_t size, const void *data, bool staticdata)
 {
 	assert(nomap);	// once it's mappable, it cannot be recreated anymore.
 	Bind();
@@ -92,6 +92,12 @@ void GLBuffer::SetData(size_t size, void *data, bool staticdata)
 	InvalidateBufferState();
 }
 
+void GLBuffer::SetSubData(size_t offset, size_t size, const void *data)
+{
+	Bind();
+	glBufferSubData(mUseType, offset, size, data);
+}
+
 void GLBuffer::Map()
 {
 	assert(nomap == false);	// do not allow mapping of static buffers. Vulkan cannot do that so it should be blocked in OpenGL, too.