From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 23 Jan 2021 17:27:32 +0000 (+0200)
Subject: Remove support for UInt8 indices from Batch
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=c897f76c44c2baaa90c0f85e0bcbee152a99272a

Remove support for UInt8 indices from Batch

Vulkan does not support them
---

diff --git a/source/batch.cpp b/source/batch.cpp
index 0f6418b5..f2614c41 100644
--- a/source/batch.cpp
+++ b/source/batch.cpp
@@ -12,7 +12,7 @@ using namespace std;
 namespace {
 
 template<typename T>
-void append(vector<unsigned char> &data, T i)
+void append(vector<Msp::UInt8> &data, T i)
 {
 	data.insert(data.end(), sizeof(T), 0);
 	*(T *)(&data[data.size()-sizeof(T)]) = i;
@@ -28,7 +28,7 @@ U convert(T n)
 }
 
 template<typename T, typename U>
-void expand(vector<unsigned char> &data)
+void expand(vector<Msp::UInt8> &data)
 {
 	unsigned count = data.size()/sizeof(T);
 	data.resize(count*sizeof(U));
@@ -37,7 +37,7 @@ void expand(vector<unsigned char> &data)
 }
 
 template<typename T, typename U>
-void shrink(vector<unsigned char> &data)
+void shrink(vector<Msp::UInt8> &data)
 {
 	unsigned count = data.size()/sizeof(T);
 	for(unsigned i=0; i<count; ++i)
@@ -54,7 +54,7 @@ unsigned Batch::restart_index = 0;
 
 Batch::Batch(PrimitiveType t):
 	prim_type(t),
-	data_type(UNSIGNED_BYTE),
+	data_type(UNSIGNED_SHORT),
 	max_index(0),
 	restart(false)
 { }
@@ -65,25 +65,15 @@ Batch::~Batch()
 
 void Batch::set_data_type(DataType t)
 {
-	if(t!=UNSIGNED_BYTE && t!=UNSIGNED_SHORT && t!=UNSIGNED_INT)
+	if(t!=UNSIGNED_SHORT && t!=UNSIGNED_INT)
 		throw invalid_argument("Batch::set_data_type");
-	if(t==UNSIGNED_BYTE && max_index>0xFE)
-		throw invalid_operation("Batch::set_data_type");
-	else if(t==UNSIGNED_SHORT && max_index>0xFFFE)
+	if(t==UNSIGNED_SHORT && max_index>0xFFFE)
 		throw invalid_operation("Batch::set_data_type");
 
-	if(data_type==UNSIGNED_BYTE && t==UNSIGNED_SHORT)
-		expand<unsigned char, unsigned short>(data);
-	else if(data_type==UNSIGNED_BYTE && t==UNSIGNED_INT)
-		expand<unsigned char, unsigned>(data);
-	else if(data_type==UNSIGNED_SHORT && t==UNSIGNED_INT)
-		expand<unsigned short, unsigned>(data);
-	else if(data_type==UNSIGNED_INT && t==UNSIGNED_BYTE)
-		shrink<unsigned, unsigned char>(data);
+	if(data_type==UNSIGNED_SHORT && t==UNSIGNED_INT)
+		expand<UInt16, UInt32>(data);
 	else if(data_type==UNSIGNED_INT && t==UNSIGNED_SHORT)
-		shrink<unsigned, unsigned short>(data);
-	else if(data_type==UNSIGNED_SHORT && t==UNSIGNED_BYTE)
-		shrink<unsigned short, unsigned char>(data);
+		shrink<UInt32, UInt16>(data);
 
 	data_type = t;
 	update_offset();
@@ -135,17 +125,17 @@ Batch &Batch::append(const Batch &other)
 	if(other.data.empty())
 		return *this;
 
+	// TODO allow appending triangles to a triangle strip
+
 	if(prim_type==POINTS || prim_type==LINES || prim_type==TRIANGLES)
 		;
 	else if(MSP_primitive_restart)
 	{
 		restart = true;
-		if(data_type==UNSIGNED_SHORT)
-			::append<unsigned short>(data, 0xFFFF);
-		else if(data_type==UNSIGNED_INT)
-			::append<unsigned>(data, 0xFFFFFFFF);
+		if(data_type==UNSIGNED_INT)
+			::append<UInt32>(data, 0xFFFFFFFF);
 		else
-			data.push_back(0xFF);
+			::append<UInt16>(data, 0xFFFF);
 	}
 	else if(prim_type==TRIANGLE_STRIP)
 	{
@@ -172,36 +162,26 @@ void Batch::append_index(unsigned i)
 	else
 		max_index = max(max_index, i);
 
-	if((data_type==UNSIGNED_BYTE || data_type==UNSIGNED_SHORT) && max_index>0xFFFE)
+	if(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);
 
-	if(data_type==UNSIGNED_SHORT)
-		::append<unsigned short>(data, i);
-	else if(data_type==UNSIGNED_INT)
-		::append<unsigned>(data, i);
+	if(data_type==UNSIGNED_INT)
+		::append<UInt32>(data, i);
 	else
-		data.push_back(i);
+		::append<UInt16>(data, i);
 }
 
 unsigned Batch::get_index_size() const
 {
-	if(data_type==UNSIGNED_SHORT)
-		return sizeof(unsigned short);
-	else if(data_type==UNSIGNED_INT)
-		return sizeof(unsigned);
-	return sizeof(unsigned char);
+	return (data_type==UNSIGNED_INT ? sizeof(UInt32) : sizeof(UInt16));
 }
 
 unsigned Batch::get_index(unsigned i) const
 {
-	if(data_type==UNSIGNED_SHORT)
-		return *(unsigned short *)&data[i*sizeof(unsigned short)];
-	else if(data_type==UNSIGNED_INT)
-		return *(unsigned *)&data[i*sizeof(unsigned )];
+	if(data_type==UNSIGNED_INT)
+		return *(UInt32 *)&data[i*sizeof(UInt32)];
 	else
-		return data[i];
+		return *(UInt16 *)&data[i*sizeof(UInt16)];
 }
 
 void Batch::draw() const
@@ -226,13 +206,7 @@ const void *Batch::setup_draw() const
 {
 	if(restart)
 	{
-		unsigned index;
-		if(data_type==UNSIGNED_SHORT)
-			index = 0xFFFF;
-		else if(data_type==UNSIGNED_INT)
-			index = 0xFFFFFFFF;
-		else
-			index = 0xFF;
+		unsigned index = (data_type==UNSIGNED_INT ? 0xFFFFFFFF : 0xFFFF);
 
 		if(index!=restart_index)
 			set_restart_index(index);
diff --git a/source/batch.h b/source/batch.h
index 82d8fbca..d42a8629 100644
--- a/source/batch.h
+++ b/source/batch.h
@@ -34,7 +34,7 @@ public:
 private:
 	PrimitiveType prim_type;
 	DataType data_type;
-	std::vector<unsigned char> data;
+	std::vector<UInt8> data;
 	unsigned min_index;
 	unsigned max_index;
 	bool restart;