Update stencils and billboards less often

No need to update these every frame when little of nothing has changed.
Instead, track the angle previously rendered and updated only when the
new angle has diverged sufficiently from this. Larger updates update
more frequently.

1 files changed, 2 insertions, 0 deletions

diff --git a/gfx/gl/shadowStenciller.h b/gfx/gl/shadowStenciller.h
index f774ac7..27ad9f9 100644
--- a/gfx/gl/shadowStenciller.h
+++ b/gfx/gl/shadowStenciller.h
@@ -16,6 +16,7 @@ public:
 	[[nodiscard]]
 	static glTexture createStencilTexture(GLsizei width, GLsizei height);
 	void setLightDirection(const LightDirection & lightDir);
+	[[nodiscard]] Direction2D getLightDirection() const;
 	void renderStencil(const glTexture &, const MeshBase &, Texture::AnyPtr texture) const;
 
 private:
@@ -23,5 +24,6 @@ private:
 	Program shadowCaster;
 	Program::RequiredUniformLocation viewProjectionLoc {shadowCaster, "viewProjection"};
 
+	Direction2D lightDir;
 	std::array<glm::mat4, STENCIL_ANGLES<size_t>> viewProjections;
 };