static std::string FixShaderCode(char *text, int textLength, const UniformRules &uniformsRename, bool vertexShader)
{
struct ReplacePair
{
ReplacePair(const char *pat, const char *rep) :
pattern(boost::xpressive::sregex::compile(pat,
(boost::xpressive::regex_constants::ECMAScript |
boost::xpressive::regex_constants::optimize))),
replace(rep)
{
}
boost::xpressive::sregex pattern;
std::string replace;
};
static const ReplacePair sFixPairs[] =
{
ReplacePair("\\.0+E\\+0+\\b", ".0"),
ReplacePair("0*E\\+0+\\b", ""),
ReplacePair("(\\d+)\\.([0-9][1-9])0*E\\+0+2\\b", "$1$2.0"),
ReplacePair("(\\d+)\\.([1-9])0*E\\+0+1\\b", "$1$2.0"),
ReplacePair("(\\d+)\\.0+E\\-0+1\\b", "0.$1"),
ReplacePair("(\\d+)\\.00+E(\\+\\d+)\\b", "$1.0E$2"),
ReplacePair("ATI_draw_buffers", "ARB_draw_buffers"),
ReplacePair("\\:require\\n", ":enable\n"),
ReplacePair("#version \\d+", ""),
};
static const boost::xpressive::sregex structPattern(boost::xpressive::sregex::compile("\\bstruct\\s+(\\w+)\\s*{[^}]*};",
(boost::xpressive::regex_constants::ECMAScript |
boost::xpressive::regex_constants::optimize)));
static const int subs[] = {1};
std::string newtext(text, textLength);
// Find all the struct declarations
std::list<std::string> structsList;
boost::xpressive::sregex_token_iterator cur(newtext.begin(), newtext.end(), structPattern, subs);
boost::xpressive::sregex_token_iterator end;
for(; cur != end; ++cur )
{
structsList.push_back(*cur);
}
// Remove unused struct declarations
if (!structsList.empty())
{
const std::list<std::string>::const_iterator itEnd(structsList.end());
for (std::list<std::string>::const_iterator it = structsList.begin(); it != itEnd; ++it)
{
const std::string &structName(*it);
boost::xpressive::sregex_iterator cur(newtext.begin(), newtext.end(),
(boost::xpressive::_b >> structName >> boost::xpressive::_b));
boost::xpressive::sregex_iterator end;
int count = 0;
for(; cur != end; ++cur, ++count)
{
}
if (1 >= count)
{
const boost::xpressive::sregex removeStructPattern(boost::xpressive::sregex::compile("\\bstruct\\s+" + structName + "\\s*{[^}]*};"));
newtext = regex_replace(newtext, removeStructPattern, std::string(""));
}
}
structsList.clear();
}
// Fix numbers and GLSL 'require's
const size_t numPairs = sizeof(sFixPairs) / sizeof(ReplacePair);
for (size_t n = 0; n < numPairs; n++)
{
newtext = regex_replace(newtext, sFixPairs[n].pattern, sFixPairs[n].replace);
}
// Fix names of uniform values
const UniformRules::const_iterator itEnd(uniformsRename.end());
for (UniformRules::const_iterator it = uniformsRename.begin(); it != itEnd; ++it)
{
newtext = regex_replace(newtext, (it->first), (it->second));
}
// Fix vertex attributes
if (vertexShader)
{
struct AttributeReplaceRule
{
AttributeReplaceRule(const char *src, const char *dst, const char *tn) :
re(boost::xpressive::_b >> src >> boost::xpressive::_b),
replace(dst),
typeName(tn)
{
}
boost::xpressive::sregex re;
std::string replace;
const char *typeName;
};
static const AttributeReplaceRule sAttributeReplaceRules[] =
{
AttributeReplaceRule("gl_Vertex", "ATTR0", "vec4"),
AttributeReplaceRule("gl_Normal", "ATTR2", "vec3"),
AttributeReplaceRule("gl_Color", "ATTR3", "vec4"),
AttributeReplaceRule("gl_SecondaryColor", "ATTR4", "vec4"),
AttributeReplaceRule("gl_FogCoord", "ATTR5", "float"),
AttributeReplaceRule("gl_MultiTexCoord0", "ATTR8", "vec4"),
AttributeReplaceRule("gl_MultiTexCoord1", "ATTR9", "vec4"),
AttributeReplaceRule("gl_MultiTexCoord2", "ATTR10", "vec4"),
AttributeReplaceRule("gl_MultiTexCoord3", "ATTR11", "vec4"),
AttributeReplaceRule("gl_MultiTexCoord4", "ATTR12", "vec4"),
AttributeReplaceRule("gl_MultiTexCoord5", "ATTR13", "vec4"),
AttributeReplaceRule("gl_MultiTexCoord6", "ATTR14", "vec4"),
AttributeReplaceRule("gl_MultiTexCoord7", "ATTR15", "vec4")
};
const size_t numRules = sizeof(sAttributeReplaceRules) / sizeof(AttributeReplaceRule);
for (size_t n = numRules; n--; )
{
const AttributeReplaceRule &rule(sAttributeReplaceRules[n]);
if (regex_search(newtext, rule.re))
{
newtext = regex_replace(newtext, rule.re, rule.replace);
newtext = std::string("attribute ") + rule.typeName + " " + rule.replace + ";" + newtext;
}
}
}
std::string Regex::Match::replace(std::string rep, unsigned int index)
{
ReplaceMap tmp;
tmp.insert(ReplacePair(index,rep));
return replace(tmp);
}
