Style update: add spaces around assignment operators

[libs/gl.git] / source / vertexformat.cpp

diff --git a/source/vertexformat.cpp b/source/vertexformat.cpp
index 5c02f2ab3aec7180f2a40a4a12b225bbe8ae5c38..e56397e2b088cb93a1204d80027ef875b1c91a73 100644 (file)
--- a/source/vertexformat.cpp
+++ b/source/vertexformat.cpp
@@ -1,65 +1,176 @@
 /* $Id$
 
 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;
+       unsigned start = 0;
 
        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);
+                       f = (f,VERTEX2);
                else if(!str.compare(start, underscore-start, "VERTEX3"))
-                       f=(f,VERTEX3);
+                       f = (f,VERTEX3);
                else if(!str.compare(start, underscore-start, "VERTEX4"))
-                       f=(f,VERTEX4);
+                       f = (f,VERTEX4);
                else if(!str.compare(start, underscore-start, "NORMAL3"))
-                       f=(f,NORMAL3);
+                       f = (f,NORMAL3);
                else if(!str.compare(start, underscore-start, "TEXCOORD1"))
-                       f=(f,TEXCOORD1);
+                       f = (f,TEXCOORD1);
                else if(!str.compare(start, underscore-start, "TEXCOORD2"))
-                       f=(f,TEXCOORD2);
+                       f = (f,TEXCOORD2);
                else if(!str.compare(start, underscore-start, "TEXCOORD3"))
-                       f=(f,TEXCOORD3);
+                       f = (f,TEXCOORD3);
                else if(!str.compare(start, underscore-start, "TEXCOORD4"))
-                       f=(f,TEXCOORD4);
+                       f = (f,TEXCOORD4);
                else if(!str.compare(start, underscore-start, "COLOR4UB"))
-                       f=(f,COLOR4_UBYTE);
+                       f = (f,COLOR4_UBYTE);
                else if(!str.compare(start, underscore-start, "COLOR3F"))
-                       f=(f,COLOR3_FLOAT);
+                       f = (f,COLOR3_FLOAT);
                else if(!str.compare(start, underscore-start, "COLOR4F"))
-                       f=(f,COLOR4_FLOAT);
+                       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;
+               start = underscore+1;
        }
 
        return in;