/** True if the next token begins the close tag */
static bool atClose(TextInput& t, const std::string name) {
if ((t.peek().type() == Token::SYMBOL) && (t.peek().string() == "<")) {
// Need to keep looking ahead
Token p0 = t.read();
if ((t.peek().type() == Token::SYMBOL) && (t.peek().string() == "/")) {
// Check the name on the close tag. It *must* match if
// this is a well-formed document, but there might be a
// tag error.
Token p1 = t.read();
Token p2 = t.peek();
std::string s = p2.string();
debugAssertM(beginsWith(name, s), "Mismatched close tag");
// Put the tokens back
t.push(p1);
t.push(p0);
return true;
} else {
// Put the read token back
t.push(p0);
return false;
}
} else {
return false;
}
}
bool GPUProgram::BindingTable::consumeSymbol(TextInput& ti, const std::string& s) {
Token t = ti.peek();
if (symbolMatch(t, s)) {
ti.readSymbol(s);
return true;
} else {
return false;
}
}
GLenum Shader::ShaderProgram::getDeclarationType(TextInput& ti, bool& uniform) {
uniform = false;
if (ti.peek().type() == Token::SYMBOL) {
bool readyForType = false;
String s = ti.peek().string();
//Parse all qualifiers before the type:
while (! readyForType) {
if (isQualifier(s)) {
uniform = (uniform || (s == "uniform"));
ti.readSymbol(s);
s = ti.peek().string();
} else if (s == "layout") {
//This should properly parse through all possible layout inputs
//http://www.opengl.org/registry/doc/GLSLangSpec.4.30.6.pdf (pg52)
ti.readSymbol(s);
ti.readSymbol("(");
Token t = ti.read();
while ((t.type() != Token::SYMBOL) || (t.string() != ")")) {
t = ti.read();
}
s = ti.peek().string();
} else {
// The next token is not a qualifier of any sort, so it is probably the type, if this is a declaration
readyForType = true;
}
}
// Read the type
String variableSymbol = ti.readSymbol();
// check for unsigned int, short, long long, etc
if (variableSymbol == "unsigned") {
while (toGLType(variableSymbol + " " + ti.peek().string()) != GL_NONE) {
variableSymbol += " " + ti.readSymbol();
}
}
// If the variableSymbol is not a valid type, then this is not a variable declaration, and GL_NONE will be returned
// Checking for not being a declaration cannot be done earlier, as a declaration could have no qualifiers
return toGLType(variableSymbol);
} else {
return GL_NONE;
}
}
void GPUProgram::BindingTable::parseConstant(TextInput& ti) {
if (consumeSymbol(ti, "c") && consumeSymbol(ti, "[")) {
// constant
Token t = ti.peek();
if (t.type() == Token::NUMBER) {
Binding binding;
binding.source = CONSTANT;
binding.type = FLOAT4;
binding.slot = iRound(ti.readNumber());
if (consumeSymbol(ti, "]") && consumeSymbol(ti, "=")) {
for (int i = 0; i < 4; ++i) {
t = ti.peek();
if (t.type() == Token::NUMBER) {
binding.vector[i] = ti.readNumber();
}
}
bindingArray.append(binding);
}
}
}
}
void XML::deserialize(TextInput& t) {
begin:
Token n = t.read();
m_attribute.clear();
m_child.clear();
m_name = "";
m_value = "";
if ((n.type() == Token::SYMBOL) && (n.string() == "<")) {
// Beginning a tag
// Read name
n = t.read();
debugAssert(n.type() == Token::SYMBOL);
bool isComment =
(n.string() == "!") &&
(t.peek().type() == Token::SYMBOL) &&
(t.peek().string() == "--");
// ignored tag: <?xml> or <!xml>
// comment tag: <!-- ... -->
if ((n.string() == "?") || ((n.string() == "!") && ! isComment)) {
// Ignore this tag
while (t.hasMore() && ! ((n.type() == Token::SYMBOL) && (n.string() == ">"))) {
n = t.read();
}
goto begin;
} else if (isComment) {
// Ignore until "-->"
bool prevWasDash = false;
while (t.hasMore() && ! ((n.type() == Token::SYMBOL) && (n.string() == ">") && prevWasDash)) {
prevWasDash = (n.type() == Token::SYMBOL) && (n.string() == "--");
n = t.read();
}
goto begin;
}
// Keep reading until no colon
m_name += n.string();
n = t.read();
while ((n.type() == Token::SYMBOL) && (n.string() == ":")) {
// tag with namespace: <x:y>
m_name += ":" + t.readSymbol();
n = t.read();
}
// Read end of tag/close
bool done = false;
while (! done) {
debugAssert(n.type() == Token::SYMBOL);
if (n.string() == "/") {
// empty-element tag: <foo/>
// Consume the close tag
t.readSymbol(">");
done = true;
} else if (n.string() == ">") {
// End of open tag: read children until close tag
while (! atClose(t, m_name)) {
m_child.next().deserialize(t);
}
// Read close tag (we wouldn't be here unless it parses correctly)
while (t.hasMore() && ! (t.readSymbol() == ">")) {}
done = true;
} else {
// Attribute pair
std::string k = n.string();
t.readSymbol("=");
std::string v = t.read().string();
m_attribute.set(k, v);
// Advance to next
n = t.read();
}
}
} else {
// Beginning embedded content. Read until the end of file or the next tag.
m_type = VALUE;
m_value += n.string();
n = t.peek();
while (t.hasMore() && ! ((n.type() == Token::SYMBOL) && (n.string() == "<"))) {
m_value += " " + t.read().string();
n = t.peek();
}
}
}
void GPUProgram::BindingTable::parseVariable(TextInput& ti) {
std::string name;
// #var float4 osLight : : c[4] : 1 : 1
// #var float3 vin.v0 : $vin.POSITION : ATTR0 : 2 : 1
Token t = ti.peek();
if (t.type() != Token::SYMBOL) {
goto abort;
}
// get the binding's type
ti.readSymbol();
Type type;
if (! CgType(t.string(), type)) {
alwaysAssertM(false, std::string("Unsupported type: \"") + t.string() + "\"");
}
t = ti.peek();
if (t.type() != Token::SYMBOL) {
goto abort;
}
// read the binding name
name = ti.readSymbol();
if (! consumeSymbol(ti, ":")) {
goto abort;
}
// see if it is the vertex or a constant register
t = ti.peek();
if (t.type() != Token::SYMBOL) {
goto abort;
}
// Sometimes there is an extra token between the colons
if (t.string() != ":") {
ti.readSymbol();
t = ti.peek();
}
if (! consumeSymbol(ti, ":")) {
goto abort;
}
// read the register number
t = ti.peek();
if (t.type() != Token::SYMBOL) {
goto abort;
}
// Consume the symbol we just peeked
ti.readSymbol();
if (t.string() == "texunit") {
// We're reading a texture unit
} else if (t.string() == "c") {
// We're reading a regular variable; parse the open bracket
if (! consumeSymbol(ti, "[")) {
goto abort;
}
} else if ((t.type() == Token::SYMBOL) && (t.string() == ":")) {
// Unused variable; must be present but is not bound
Binding binding;
binding.source = VARIABLE;
binding.type = type;
binding.name = name;
binding.slot = Binding::UNASSIGNED;
bindingArray.append(binding);
return;
} else {
// Something unexpected happened.
goto abort;
}
t = ti.peek();
if (t.type() == Token::NUMBER) {
int slot = iRound(ti.readNumber());
Binding binding;
binding.source = VARIABLE;
binding.type = type;
binding.name = name;
binding.slot = slot;
bindingArray.append(binding);
}
abort:
;// Jump here if anything unexpected is encountered during parsing
}