Min LOD and Max LOD sampler parameters

Plumbing to send Min LOD and Max LOD from the Sampler
object in the Context to the Renderer's texture's state.

Change-Id: I6831a8e17d67e745d12a78176d566750d971ec76
Reviewed-on: https://swiftshader-review.googlesource.com/5510
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Meng-Lin Wu <marleymoo@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/Renderer/Sampler.hpp

diff --git a/src/Renderer/Sampler.hpp b/src/Renderer/Sampler.hpp
index cbb0588..032bf58 100644
--- a/src/Renderer/Sampler.hpp
+++ b/src/Renderer/Sampler.hpp
@@ -69,6 +69,8 @@
 		float maxAnisotropy;
 		int baseLevel;
 		int maxLevel;
+		float minLod;
+		float maxLod;
 	};
 
 	enum SamplerType
@@ -182,6 +184,8 @@
 		void setSwizzleA(SwizzleType swizzleA);
 		void setBaseLevel(int baseLevel);
 		void setMaxLevel(int maxLevel);
+		void setMinLod(float minLod);
+		void setMaxLod(float maxLod);
 
 		static void setFilterQuality(FilterType maximumFilterQuality);
 		static void setMipmapQuality(MipmapType maximumFilterQuality);