From c48cb5362edb16c33ed5f6862a908bb9a754c85a Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 11 Jan 2011 19:55:33 +0000
Subject: [PATCH] Avoid unnecessary work in Batch's vector append Make
 Immediate use Batch for drawing

---
 source/batch.cpp     | 37 +++++++++++++++++++++++++++++++++++--
 source/batch.h       |  3 ++-
 source/immediate.cpp | 11 ++++++++---
 source/immediate.h   |  2 +-
 4 files changed, 46 insertions(+), 7 deletions(-)

diff --git a/source/batch.cpp b/source/batch.cpp
index 228ff20b..102b6487 100644
--- a/source/batch.cpp
+++ b/source/batch.cpp
@@ -119,9 +119,42 @@ Batch &Batch::append(unsigned i)
 
 void Batch::append(const vector<unsigned> &ind)
 {
-	data.reserve(data.size()+ind.size()*get_index_size());
+	if(ind.empty())
+		return;
+
+	if(data.empty())
+		min_index = max_index = ind.front();
+
 	for(vector<unsigned>::const_iterator i=ind.begin(); i!=ind.end(); ++i)
-		append(*i);
+	{
+		min_index = min(min_index, *i);
+		max_index = max(max_index, *i);
+	}
+
+	if((data_type==UNSIGNED_BYTE || data_type==UNSIGNED_SHORT) && max_index>0xFFFE)
+		set_data_type(UNSIGNED_INT);
+	else if(data_type==UNSIGNED_BYTE && max_index>0xFE)
+		set_data_type(UNSIGNED_SHORT);
+
+	unsigned base = data.size();
+	data.resize(data.size()+ind.size()*get_index_size());
+	if(data_type==UNSIGNED_SHORT)
+	{
+		unsigned short *ptr = reinterpret_cast<unsigned short *>(&data[base]);
+		for(unsigned i=0; i<ind.size(); ++i)
+			ptr[i] = ind[i];
+	}
+	else if(data_type==UNSIGNED_INT)
+	{
+		unsigned *ptr = reinterpret_cast<unsigned *>(&data[base]);
+		for(unsigned i=0; i<ind.size(); ++i)
+			ptr[i] = ind[i];
+	}
+	else
+	{
+		for(unsigned i=0; i<ind.size(); ++i)
+			data[base+i] = ind[i];
+	}
 }
 
 void Batch::append(const Batch &other)
diff --git a/source/batch.h b/source/batch.h
index c3e9848e..696891ba 100644
--- a/source/batch.h
+++ b/source/batch.h
@@ -66,6 +66,7 @@ public:
 	unsigned size() const { return data.size()/get_index_size(); }
 	unsigned get_index(unsigned) const;
 	void draw() const;
+
 private:
 	unsigned get_index_size() const;
 
@@ -80,7 +81,7 @@ private:
 
 	template<typename T, typename U>
 	U convert(T) const;
-private:
+
 	void unlink_from_ibuf();
 	void update_ibuf_offsets();
 };
diff --git a/source/immediate.cpp b/source/immediate.cpp
index 3d808d32..15d3a634 100644
--- a/source/immediate.cpp
+++ b/source/immediate.cpp
@@ -5,6 +5,7 @@ Copyright © 2007  Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
 
+#include "batch.h"
 #include "immediate.h"
 
 namespace Msp {
@@ -23,15 +24,19 @@ void Immediate::reset()
 		throw InvalidState("Can't reset Immediate between begin() and end()");
 
 	array.clear();
+}
+
+void Immediate::begin_()
+{
 	indices.clear();
 }
 
 void Immediate::end_()
 {
+	Batch batch(type);
+	batch.append(indices);
 	array.apply();
-	draw_elements(type, indices.size(), &indices[0]);
-
-	indices.clear();
+	batch.draw();
 }
 
 void Immediate::element_(unsigned i)
diff --git a/source/immediate.h b/source/immediate.h
index 89380c41..6822aba2 100644
--- a/source/immediate.h
+++ b/source/immediate.h
@@ -30,7 +30,7 @@ public:
 	Immediate(VertexFormat);
 	void reset();
 private:
-	virtual void begin_() { }
+	virtual void begin_();
 	virtual void end_();
 	virtual void element_(unsigned);
 };
-- 
2.43.0