LOD Base level and Max level to sampler state

Plumbing to send the LOD base level and max level from the Sampler
object in the Context to the Renderer's texture's state.

Change-Id: I5a9571f58a0cbaea8cedfb98da159672673eed94
Reviewed-on: https://swiftshader-review.googlesource.com/5501
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/Shader/PixelProgram.cpp

diff --git a/src/Shader/PixelProgram.cpp b/src/Shader/PixelProgram.cpp
index 662b834..af9fca0 100644
--- a/src/Shader/PixelProgram.cpp
+++ b/src/Shader/PixelProgram.cpp
@@ -1152,8 +1152,8 @@
 
 	void PixelProgram::TEXSIZE(Vector4f &dst, Float4 &lod, const Src &src1)
 	{
-		Pointer<Byte> textureMipmap = data + OFFSET(DrawData, mipmap) + src1.index * sizeof(Texture) + OFFSET(Texture, mipmap);
-		sampler[src1.index]->textureSize(textureMipmap, dst, lod);
+		Pointer<Byte> texture = data + OFFSET(DrawData, mipmap) + src1.index * sizeof(Texture);
+		sampler[src1.index]->textureSize(texture, dst, lod);
 	}
 
 	void PixelProgram::TEXKILL(Int cMask[4], Vector4f &src, unsigned char mask)

src/Shader/SamplerCore.cpp

diff --git a/src/Shader/SamplerCore.cpp b/src/Shader/SamplerCore.cpp
index 264f35d..9e2179b 100644
--- a/src/Shader/SamplerCore.cpp
+++ b/src/Shader/SamplerCore.cpp
@@ -549,11 +549,12 @@
 		}
 	}
 
-	void SamplerCore::textureSize(Pointer<Byte> &textureMipmap, Vector4f &size, Float4 &lod)
+	void SamplerCore::textureSize(Pointer<Byte> &texture, Vector4f &size, Float4 &lod)
 	{
 		for(int i = 0; i < 4; ++i)
 		{
-			Pointer<Byte> mipmap = textureMipmap + (As<Int>(Extract(lod, i)) + Int(state.baseLevel)) * sizeof(Mipmap);
+			Int baseLevel = *Pointer<Int>(texture + OFFSET(Texture, baseLevel));
+			Pointer<Byte> mipmap = texture + OFFSET(Texture, mipmap) + (As<Int>(Extract(lod, i)) + baseLevel) * sizeof(Mipmap);
 			size.x = Insert(size.x, As<Float>(Int(*Pointer<Short>(mipmap + OFFSET(Mipmap, width)))), i);
 			size.y = Insert(size.y, As<Float>(Int(*Pointer<Short>(mipmap + OFFSET(Mipmap, height)))), i);
 			size.z = Insert(size.z, As<Float>(Int(*Pointer<Short>(mipmap + OFFSET(Mipmap, depth)))), i);

src/Shader/VertexProgram.cpp

diff --git a/src/Shader/VertexProgram.cpp b/src/Shader/VertexProgram.cpp
index 7868074..b986122 100644
--- a/src/Shader/VertexProgram.cpp
+++ b/src/Shader/VertexProgram.cpp
@@ -1577,8 +1577,8 @@
 
 	void VertexProgram::TEXSIZE(Vector4f &dst, Float4 &lod, const Src &src1)
 	{
-		Pointer<Byte> textureMipmap = data + OFFSET(DrawData, mipmap[16]) + src1.index * sizeof(Texture) + OFFSET(Texture, mipmap);
-		sampler[src1.index]->textureSize(textureMipmap, dst, lod);
+		Pointer<Byte> texture = data + OFFSET(DrawData, mipmap[16]) + src1.index * sizeof(Texture);
+		sampler[src1.index]->textureSize(texture, dst, lod);
 	}
 
 	void VertexProgram::sampleTexture(Vector4f &c, const Src &s, Float4 &u, Float4 &v, Float4 &w, Float4 &q, Vector4f &dsx, Vector4f &dsy, Vector4f &offset, SamplerMethod method, bool hasOffset)