From: Sam Moore <matches@ucc.asn.au>
Date: Wed, 26 Mar 2014 17:20:20 +0000 (+0800)
Subject: Make real.h so we can change reals
X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=commitdiff_plain;h=32cd67ec48271c176eba218e082fcf5824aa8e6c

Make real.h so we can change reals

Needed to fix view.cpp to call Float where it expects GLfloat
Had an attempt at making a half precision float, but it didn't go very well.

I don't think half precision floats are *that* terrible...
Probably got the bit masking wrong.
---

diff --git a/src/ipdf.h b/src/ipdf.h
index 8ee30c3..c34f5ed 100644
--- a/src/ipdf.h
+++ b/src/ipdf.h
@@ -2,12 +2,11 @@
 #define _IPDF_H
 
 #include "common.h"
+#include "real.h"
 
 namespace IPDF
 {
-	typedef float Real;
-	
-	inline float RealToFloat(Real r) {return r;}
+
 	inline Real Random(Real max=1, Real min=0)
 	{
 		return min + (max-min) * ((Real)(rand() % (int)1e6) / 1e6);
diff --git a/src/real.h b/src/real.h
new file mode 100644
index 0000000..1d3fb8b
--- /dev/null
+++ b/src/real.h
@@ -0,0 +1,51 @@
+#ifndef _REAL_H
+#define _REAL_H
+
+#include "common.h"
+
+namespace IPDF
+{
+
+//#define REAL_FLOAT
+#define REAL_DOUBLE
+//#define REAL_HALF
+
+#ifdef REAL_SINGLE
+	typedef float Real;
+	inline float Float(Real r) {return r;}
+#elif defined REAL_DOUBLE
+	typedef double Real;
+	inline double Float(Real r) {return r;}
+#elif defined REAL_HALF
+	struct Real
+	{
+		Real() = default;
+		Real(float r) : value(r) 
+		{
+			int & a = *((int*)(&value)); // um...
+			// mask out extra bits in exponent
+			 //1000 1111 1000 0000 0000 0011 1111 1111
+			// Endianness matters
+			a &= 0xFF3008F8;//0x8F8003FF;
+
+		}	
+	
+		Real operator+(float f) {return Real(value+f);}
+		Real operator-(float f) {return Real(value+f);}
+		Real operator/(float f) {return Real(value/f);}
+		Real operator*(float f) {return Real(value*f);}
+		Real operator+(const Real & r) {return this->operator+(r.value);}
+		Real operator-(const Real & r) {return this->operator-(r.value);}
+		Real operator*(const Real & r) {return this->operator*(r.value);}
+		Real operator/(const Real & r) {return this->operator/(r.value);}
+		float value;
+	};
+	inline float Float(Real r) {return r.value;}
+
+	inline std::ostream & operator<<(std::ostream & os, Real & r) {return os << r.value;} // yuk
+
+#endif //REAL_HALF
+
+}
+
+#endif //_REAL_H
diff --git a/src/tests/realtofloat.cpp b/src/tests/realtofloat.cpp
new file mode 100644
index 0000000..b09bd49
--- /dev/null
+++ b/src/tests/realtofloat.cpp
@@ -0,0 +1,9 @@
+#include "main.h"
+float test = 1e4;
+int main(int argc, char ** argv)
+{
+	Real r(test);
+	Debug("test float %.20f", test);
+	Debug("test real %.20f", Float(r));
+	return 0;
+}
diff --git a/src/view.cpp b/src/view.cpp
index 9e832d2..ed62704 100644
--- a/src/view.cpp
+++ b/src/view.cpp
@@ -19,7 +19,7 @@ void View::Render()
 
 	glMatrixMode(GL_PROJECTION);
 	glLoadIdentity();
-	glOrtho(m_bounds.x, m_bounds.x+m_bounds.w, m_bounds.y + m_bounds.h, m_bounds.y, -1.f, 1.f);
+	glOrtho(Float(m_bounds.x), Float(m_bounds.x)+Float(m_bounds.w), Float(m_bounds.y) + Float(m_bounds.h), Float(m_bounds.y), -1.f, 1.f);
 	glMatrixMode(GL_MODELVIEW);
 	glLoadIdentity();
 
@@ -30,10 +30,10 @@ void View::Render()
 		if (m_document.m_objects.types[id] == RECT_FILLED)
 			continue;
 		Rect obj_bounds = m_document.m_objects.bounds[id];
-		glVertex2f(obj_bounds.x, obj_bounds.y);
-		glVertex2f(obj_bounds.x + obj_bounds.w, obj_bounds.y);
-		glVertex2f(obj_bounds.x + obj_bounds.w, obj_bounds.y + obj_bounds.h);
-		glVertex2f(obj_bounds.x, obj_bounds.y + obj_bounds.h);
+		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y));
+		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y));
+		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y) + Float(obj_bounds.h));
+		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y) + Float(obj_bounds.h));
 	}
 	glEnd();
 
@@ -43,10 +43,10 @@ void View::Render()
 			continue;
 		Rect obj_bounds = m_document.m_objects.bounds[id];
 		glBegin(GL_LINE_LOOP);
-		glVertex2f(obj_bounds.x, obj_bounds.y);
-		glVertex2f(obj_bounds.x + obj_bounds.w, obj_bounds.y);
-		glVertex2f(obj_bounds.x + obj_bounds.w, obj_bounds.y + obj_bounds.h);
-		glVertex2f(obj_bounds.x, obj_bounds.y + obj_bounds.h);
+		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y));
+		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y));
+		glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y) + Float(obj_bounds.h));
+		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y) + Float(obj_bounds.h));
 		glEnd();
 	}