/* $Id$
This file is part of libmspgl
-Copyright © 2007 Mikko Rasa, Mikkosoft Productions
+Copyright © 2007-2010 Mikko Rasa, Mikkosoft Productions
Distributed under the LGPL
*/
+#include <cstring>
+#include <msp/strings/lexicalcast.h>
+#include "except.h"
#include "vertexformat.h"
+using namespace std;
+
namespace Msp {
namespace GL {
-uint get_stride(VertexFormat f)
+VertexFormat::VertexFormat():
+ data(0)
+{ }
+
+VertexFormat::VertexFormat(VertexComponent c):
+ data(new unsigned char[8])
+{
+ data[0]=1;
+ data[1]=c;
+}
+
+VertexFormat::VertexFormat(const VertexFormat &f):
+ data(0)
+{
+ if(f.data)
+ {
+ data=new unsigned char[f.data[0]/8+8];
+ memcpy(data, f.data, f.data[0]+1);
+ }
+}
+
+VertexFormat &VertexFormat::operator=(const VertexFormat &f)
+{
+ delete[] data;
+ if(f.data)
+ {
+ data=new unsigned char[f.data[0]/8+8];
+ memcpy(data, f.data, f.data[0]+1);
+ }
+ else
+ data=0;
+
+ return *this;
+}
+
+VertexFormat::~VertexFormat()
+{
+ delete[] data;
+}
+
+unsigned VertexFormat::stride() const
+{
+ unsigned s=0;
+ for(const unsigned char *i=begin(); i!=end(); ++i)
+ s+=(*i&3)+1;
+ return s;
+}
+
+VertexFormat operator,(const VertexFormat &f, VertexComponent c)
+{
+ VertexFormat r=f;
+ if(r.data)
+ {
+ const unsigned char n=++r.data[0];
+ if((n&7)==7)
+ {
+ unsigned char *newdt=new unsigned char[n+9];
+ memcpy(newdt, r.data, n);
+ delete r.data;
+ r.data=newdt;
+ }
+ r.data[n]=c;
+ }
+ else
+ {
+ r.data=new unsigned char[8];
+ r.data[0]=1;
+ r.data[1]=c;
+ }
+
+ return r;
+}
+
+VertexFormat operator,(const VertexFormat &f, unsigned i)
{
- uint stride=0;
- for(uint fmt=f; fmt; fmt>>=4)
- stride+=(fmt&3)+1;
- return stride*sizeof(float);
+ if(!f.data)
+ throw InvalidState("VertexFormat has no components");
+ VertexFormat r=f;
+ unsigned char *c=r.data+r.data[0];
+ if(*c<ATTRIB1)
+ throw InvalidState("Last component is not a generic attribute");
+ // VertexArray uses an unsigned to store flags for enabled arrays
+ if(i>=28)
+ throw InvalidParameterValue("Generic attribute index out of range");
+ *c+=i*4;
+
+ return r;
}
-std::istream &operator>>(std::istream &in, VertexFormat &f)
+istream &operator>>(istream &in, VertexFormat &f)
{
- std::string str;
+ string str;
in>>str;
unsigned start=0;
- f=NODATA;
while(1)
{
- unsigned underscore=str.find('_', start);
+ string::size_type underscore=str.find('_', start);
+ bool fail=false;
if(!str.compare(start, underscore-start, "VERTEX2"))
f=(f,VERTEX2);
else if(!str.compare(start, underscore-start, "VERTEX3"))
f=(f,COLOR3_FLOAT);
else if(!str.compare(start, underscore-start, "COLOR4F"))
f=(f,COLOR4_FLOAT);
+ else if(underscore>=start+8 && !str.compare(start, 6, "ATTRIB"))
+ {
+ try
+ {
+ char n=str[start+6];
+ unsigned i=lexical_cast<unsigned>(str.substr(start+7, underscore-start-7));
+ if(n=='1')
+ f=(f,ATTRIB1,i);
+ else if(n=='2')
+ f=(f,ATTRIB2,i);
+ else if(n=='3')
+ f=(f,ATTRIB3,i);
+ else if(n=='4')
+ f=(f,ATTRIB4,i);
+ else
+ fail=true;
+ }
+ catch(const LexicalError &)
+ {
+ fail=true;
+ }
+ }
else
+ fail=true;
+
+ if(fail)
{
- in.setstate(std::ios_base::failbit);
+ in.setstate(ios_base::failbit);
break;
}
- if(underscore==std::string::npos)
+ if(underscore==string::npos)
break;
start=underscore+1;
}