From dadeddcafa1e0c292bb4093529eff4d353b1d700 Mon Sep 17 00:00:00 2001
From: Joshua Moerman <lakseru@gmail.com>
Date: Sat, 3 Sep 2011 16:38:28 +0200
Subject: [PATCH] added support for arrays (via std::array)

---
 J/interpolator.h | 101 +++++++++++++++++++++++++++++++++++++++++------
 J/shader.h       |   8 +++-
 2 files changed, 96 insertions(+), 13 deletions(-)

diff --git a/J/interpolator.h b/J/interpolator.h
index 071cde9..f6a6003 100644
--- a/J/interpolator.h
+++ b/J/interpolator.h
@@ -11,6 +11,9 @@
 
 #include <tr1/functional>
 
+// NOTE: there is a specialisation for std::array
+//	But i'm not glad with how this is done...
+
 namespace J {
 
 namespace interpolators {
@@ -58,16 +61,17 @@ class interpolator {
 	
 public:
     
-    interpolator(T begin_value_ = T(0), size_t length_ = 100) : 
+	template <typename S>
+    interpolator(S begin_value_, size_t length_ = 100) : 
 	  ease_function(interpolators::cubic_in_out())
     , length(length_)
-    , steps(0)
+    , steps(length_)
     , value(begin_value_)
     , begin_value(begin_value_)
     , end_value(begin_value_) {}
 	
-	template <typename F>
-    interpolator(T begin_value_, size_t length_, F ease_function_) : 
+	template <typename S, typename F>
+    interpolator(S begin_value_, size_t length_, F ease_function_) : 
 	ease_function(ease_function_)
     , length(length_)
     , steps(0)
@@ -75,13 +79,13 @@ public:
     , begin_value(begin_value_)
     , end_value(begin_value_) {}
     
-    operator T&(){
-        return value;
-    }
-    
-    operator T const () const{
+    operator T const & () const{
         return value;
     }
+	
+	T const & get_value() const{
+		return value;
+	}
     
     void set_value(T new_value){
         begin_value = value;
@@ -110,9 +114,82 @@ public:
     
 };
 	
-	struct foo{
-		foo(int){}
-	};
+template <typename T, size_t N>
+	class interpolator<std::array<T, N> > {
+	
+	std::tr1::function<T (T)> ease_function;
+	
+	size_t length;
+	size_t steps;
+	
+	std::array<T, N> value;
+	std::array<T, N> begin_value;
+	std::array<T, N> end_value;
+	
+public:
+	
+	template <typename S>
+	interpolator(S begin_value_, size_t length_ = 100) : 
+	ease_function(interpolators::cubic_in_out())
+	, length(length_)
+	, steps(length_)
+	, value(begin_value_)
+	, begin_value(begin_value_)
+	, end_value(begin_value_) {}
+	
+	template <typename S, typename F>
+	interpolator(S const & begin_value_, size_t length_, F const & ease_function_) : 
+	ease_function(ease_function_)
+	, length(length_)
+	, steps(0)
+	, value(begin_value_)
+	, begin_value(begin_value_)
+	, end_value(begin_value_) {}
+	
+	std::array<T, N> const & get_value() const{
+		return value;
+	}
+	
+	operator std::array<T, N> const & () const{
+		return value;
+	}
+	
+	void set_value(std::array<T, N> const & new_value){
+		begin_value = value;
+		end_value = new_value;
+		steps = 0;
+	}
+
+	void set_value(T const (& new_value)[N]){
+		begin_value = value;
+		for (unsigned int i = 0; i < N; ++i) {
+			end_value[i] = new_value[i];
+		}
+		steps = 0;
+	}
+
+	void set_length(size_t new_length){
+		T ratio = (T) steps / (T) length;
+		length = new_length;
+		steps = ratio*length;
+	}
+	
+	template <typename F>
+	void set_ease_function(F new_ease_function){
+		ease_function = new_ease_function;
+	}
+	
+	void interpolate(){
+		if(steps >= length) return;
+		++steps;
+		T ratio = (T) steps / (T) length;
+		ratio = ease_function(ratio);
+		for (unsigned int i = 0; i < N; ++i) {
+			value[i] = (T(1) - ratio)*begin_value[i] + ratio*end_value[i];
+		}
+	}
+	
+};
 	
 }	// namespace J
 
diff --git a/J/shader.h b/J/shader.h
index 78eee00..f4b19c4 100644
--- a/J/shader.h
+++ b/J/shader.h
@@ -16,13 +16,15 @@
 #include <vector>
 #include <iterator>
 
-#import "basic.h"
+#include "basic.h"
+#include "array.h"
 
 // TODO: do glValidateProgram, like in the OpenGL template (see bottom)
 // TODO: add error checking at set_uniforms?
 // TODO: use an uniform map? (benchmark first!)
 // TODO: allow arrays is uniforms (now all counts are 1)
 // TODO: matrix attributes are not handled well (they take up 4 indices in the attributes)
+// NOTE: there is only 1 set_uniform for std::array...
 
 namespace J {
 
@@ -175,6 +177,10 @@ public:
 	void set_uniform(char const* name, const GLfloat (&value)[16], GLboolean trans) const {
 		glUniformMatrix4fv(glGetUniformLocation(program, name), 1, trans, value);
 	}
+	
+	void set_uniform(char const* name, const std::array<GLfloat, 16> & value, GLboolean trans) const {
+		glUniformMatrix4fv(glGetUniformLocation(program, name), 1, trans, &value[0]);
+	}
     
     void set_uniform(char const* name, const GLfloat (&value)[9], GLboolean trans) const {
 		glUniformMatrix3fv(glGetUniformLocation(program, name), 1, trans, value);