More code restructuring.

Move all love.graphics functionality that doesn’t call OpenGL out of the OpenGL backend Graphics class.

--HG--
branch : minor

src/modules/graphics/Texture.cpp

@@ -27,7 +27,10 @@ namespace graphics
 {
 
 love::Type Texture::type("Texture", &Drawable::type);
+
 Texture::Filter Texture::defaultFilter;
+Texture::FilterMode Texture::defaultMipmapFilter = Texture::FILTER_LINEAR;
+float Texture::defaultMipmapSharpness = 0.0f;
 
 Texture::Texture()
 	: format(PIXELFORMAT_UNKNOWN)
@@ -35,7 +38,7 @@ Texture::Texture()
 	, height(0)
 	, pixelWidth(0)
 	, pixelHeight(0)
-	, filter(getDefaultFilter())
+	, filter(defaultFilter)
 	, wrap()
 	, vertices()
 {
@@ -122,16 +125,6 @@ const Vertex *Texture::getVertices() const
 	return vertices;
 }
 
-void Texture::setDefaultFilter(const Filter &f)
-{
-	defaultFilter = f;
-}
-
-const Texture::Filter &Texture::getDefaultFilter()
-{
-	return defaultFilter;
-}
-
 bool Texture::validateFilter(const Filter &f, bool mipmapsAllowed)
 {
 	if (!mipmapsAllowed && f.mipmap != FILTER_NONE)