Make the number of vertex outputs configurable.

Change-Id: I17ae53e5274232e9e3b482daac56d507788e822c
Reviewed-on: https://swiftshader-review.googlesource.com/5383
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>

src/Shader/VertexShader.hpp

diff --git a/src/Shader/VertexShader.hpp b/src/Shader/VertexShader.hpp
index f8760fb..2a76cd2 100644
--- a/src/Shader/VertexShader.hpp
+++ b/src/Shader/VertexShader.hpp
@@ -16,6 +16,7 @@
 #define sw_VertexShader_hpp
 
 #include "Shader.hpp"
+#include "Main/Config.hpp"
 
 namespace sw
 {
@@ -40,8 +41,7 @@
 		enum {MAX_INPUT_ATTRIBUTES = 16};
 		Semantic input[MAX_INPUT_ATTRIBUTES];       // FIXME: Private
 
-		enum {MAX_OUTPUT_VARYINGS = 12};
-		Semantic output[MAX_OUTPUT_VARYINGS][4];   // FIXME: Private
+		Semantic output[MAX_VERTEX_OUTPUTS][4];   // FIXME: Private
 
 	private:
 		void analyzeInput();