Array textures can be easily drawn without a shader (resolves issue #1111).

Added love.graphics.drawLayer(texture, layerindex, …). ‘texture’ must be an array texture.
Added SpriteBatch:add/setLayer.

Added Quad:get/setLayer. This applies to array textures that are drawn without specifying an explicit layer index in the draw call.

Added love.graphics.newQuad variants which have layer arguments.

--HG--
branch : minor

src/modules/graphics/vertex.h

@@ -97,8 +97,10 @@ enum class CommonFormat
 	XYf,
 	RGBAub,
 	XYf_STf,
+	XYf_STPf,
 	XYf_STf_RGBAub,
 	XYf_STus_RGBAub,
+	XYf_STPf_RGBAub,
 };
 
 struct XYf_STf
@@ -107,6 +109,12 @@ struct XYf_STf
 	float s, t;
 };
 
+struct XYf_STPf
+{
+	float x, y;
+	float s, t, p;
+};
+
 struct XYf_STf_RGBAub
 {
 	float x, y;
@@ -121,6 +129,13 @@ struct XYf_STus_RGBAub
 	Color  color;
 };
 
+struct XYf_STPf_RGBAub
+{
+	float x, y;
+	float s, t, p;
+	Color color;
+};
+
 size_t getFormatStride(CommonFormat format);
 uint32 getFormatFlags(CommonFormat format);
 size_t getIndexDataSize(IndexDataType type);