Add a helper function for making indexed vertex components

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

diff --git a/source/vertexformat.cpp b/source/vertexformat.cpp
index 16cf28c7c468483bf319705b4ea8d0e30d02e9cf..ea5845c5fc10f56cca9b217a6db5c405e9b0028c 100644 (file)
--- a/source/vertexformat.cpp
+++ b/source/vertexformat.cpp
@@ -1,14 +1,8 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007-2010  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include <cstring>
+#include <algorithm>
+#include <msp/strings/format.h>
 #include <msp/strings/lexicalcast.h>
 #include <msp/strings/utils.h>
-#include "except.h"
+#include "error.h"
 #include "vertexformat.h"
 
 using namespace std;
@@ -30,11 +24,7 @@ VertexFormat::VertexFormat(VertexComponent c):
 VertexFormat::VertexFormat(const VertexFormat &f):
        data(0)
 {
-       if(f.data)
-       {
-               data = new unsigned char[(f.data[0]&~7)+8];
-               memcpy(data, f.data, f.data[0]+1);
-       }
+       *this = f;
 }
 
 VertexFormat &VertexFormat::operator=(const VertexFormat &f)
@@ -43,7 +33,7 @@ VertexFormat &VertexFormat::operator=(const VertexFormat &f)
        if(f.data)
        {
                data = new unsigned char[(f.data[0]&~7)+8];
-               memcpy(data, f.data, f.data[0]+1);
+               copy(f.data, f.data+f.data[0]+1, data);
        }
        else
                data = 0;
@@ -56,74 +46,86 @@ VertexFormat::~VertexFormat()
        delete[] data;
 }
 
+VertexFormat VertexFormat::operator,(VertexComponent c) const
+{
+       VertexFormat r = *this;
+       if(r.data)
+       {
+               const unsigned char n = ++r.data[0];
+               if((n&7)==0)
+               {
+                       unsigned char *newdt = new unsigned char[n+8];
+                       copy(r.data, r.data+n, newdt);
+                       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 VertexFormat::operator,(unsigned i) const
+{
+       if(!data)
+               throw invalid_operation("VertexFormat::operator,");
+       VertexFormat r = *this;
+       unsigned char *c = r.data+r.data[0];
+       *c = make_indexed_component(static_cast<VertexComponent>(*c), i);
+
+       return r;
+}
+
 unsigned VertexFormat::stride() const
 {
        unsigned s = 0;
        for(const unsigned char *i=begin(); i!=end(); ++i)
-               s += (*i&3)+1;
+               s += get_component_size(*i);
        return s;
 }
 
-int VertexFormat::offset(VertexComponent comp, unsigned index) const
+int VertexFormat::offset(VertexComponent comp) const
 {
-       if((comp<TEXCOORD1 && index>0) || (comp<ATTRIB1 && index>=8) || index>=53)
-               throw InvalidParameterValue("Vertex component index out of range");
-
-       unsigned type = (comp>>2)+index;
-       unsigned size = comp&3;
+       unsigned type = get_component_type(comp);
+       unsigned size = get_component_size(comp);
        unsigned offs = 0;
        for(const unsigned char *i=begin(); i!=end(); ++i)
        {
-               if(static_cast<unsigned>(*i>>2)==type)
+               if(get_component_type(*i)==type)
                {
-                       if((*i&3)>=size)
+                       if(get_component_size(*i)>=size)
                                return offs;
                        else
                                return -1;
                }
                else
-                       offs += (*i&3)+1;
+                       offs += get_component_size(*i);
        }
 
        return -1;
 }
 
-VertexFormat operator,(const VertexFormat &f, VertexComponent c)
+VertexComponent make_indexed_component(VertexComponent comp, unsigned index)
 {
-       VertexFormat r = f;
-       if(r.data)
+       if(comp>=TEXCOORD1 && comp<=TEXCOORD4)
        {
-               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;
+               if(index>=4)
+                       throw out_of_range("make_indexed_component");
        }
-       else
+       else if(comp>=ATTRIB1 && comp<=ATTRIB4)
        {
-               r.data = new unsigned char[8];
-               r.data[0] = 1;
-               r.data[1] = c;
+               if(index>=53)
+                       throw out_of_range("make_indexed_component");
        }
-
-       return r;
-}
-
-VertexFormat operator,(const VertexFormat &f, unsigned i)
-{
-       if(!f.data)
-               throw InvalidState("VertexFormat has no components");
-       VertexFormat r = f;
-       unsigned char *c = r.data+r.data[0];
-       if((*c<TEXCOORD1 && i>0) || (*c<ATTRIB1 && i>=8) || i>=53)
-               throw InvalidParameterValue("Vertex component index out of range");
-       *c += i*4;
-
-       return r;
+       else
+               throw invalid_argument("make_indexed_component");
+       return static_cast<VertexComponent>(comp+index*4);
 }
 
 void operator>>(const LexicalConverter &conv, VertexComponent &c)
@@ -144,7 +146,7 @@ void operator>>(const LexicalConverter &conv, VertexComponent &c)
                else if(str.size()==11 && str[9]=='_' && str[10]>='0' && str[10]<='7')
                        c = static_cast<VertexComponent>(TEXCOORD1+(str[8]-'1')+(str[10]-'0')*4);
                else
-                       throw LexicalError("Invalid texture unit in VertexComponent conversion");
+                       throw lexical_error(format("conversion of '%s' to VertexComponent", str));
        }
        else if(str.size()>=9 && !str.compare(0, 6, "ATTRIB") && str[6]>='1' && str[6]<='4' && str[7]=='_')
        {
@@ -153,14 +155,14 @@ void operator>>(const LexicalConverter &conv, VertexComponent &c)
                {
                        n = lexical_cast<unsigned>(str.substr(8));
                }
-               catch(const LexicalError &)
+               catch(const lexical_error &)
                {
-                       throw LexicalError("Invalid attribute in VertexComponent conversion");
+                       throw lexical_error(format("conversion of '%s' to VertexComponent", str));
                }
                c = static_cast<VertexComponent>(ATTRIB1+(str[6]-'1')+n*4);
        }
        else
-               throw LexicalError("Invalid input in VertexComponent conversion");
+               throw lexical_error(format("conversion of '%s' to VertexComponent", str));
 }
 
 // XXX This will go away eventually