private static void CompileUniforms(ShaderGroup output, ZScriptTokenizer t)
{
// so a type of a variable is normally identifier+array dimensions
// array dimensions may also exist on the variable itself (oh god this shitty C syntax)
t.SkipWhitespace();
ZScriptToken token;
token = t.ExpectToken(ZScriptTokenType.OpenCurly);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected uniforms block, got {0}", token?.ToString() ?? "<EOF>");
}
while (true)
{
t.SkipWhitespace();
token = t.ExpectToken(ZScriptTokenType.Identifier, ZScriptTokenType.CloseCurly);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected uniform or end of block, got {0}", token?.ToString() ?? "<EOF>");
}
if (token.Type == ZScriptTokenType.CloseCurly)
{
break; // done reading uniforms
}
// first goes the name, then array dimensions, then the variable name, then array dimensions, then initializer
ShaderField field = new ShaderField();
field.Line = t.PositionToLine(token.Position);
field.TypeName = token.Value;
CompileShaderField(field, t);
// done reading field, add it
output.Uniforms.Add(field);
}
}
private static List <ShaderField> CompileShaderDataBlock(ZScriptTokenizer t)
{
List <ShaderField> fields = new List <ShaderField>();
t.SkipWhitespace();
ZScriptToken token = t.ExpectToken(ZScriptTokenType.OpenCurly);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected data block, got {0}", token?.ToString() ?? "<EOF>");
}
while (true)
{
t.SkipWhitespace();
token = t.ExpectToken(ZScriptTokenType.Identifier, ZScriptTokenType.CloseCurly);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected data field or end of block, got {0}", token?.ToString() ?? "<EOF>");
}
if (token.Type == ZScriptTokenType.CloseCurly)
{
break;
}
ShaderField field = new ShaderField();
field.Line = t.PositionToLine(token.Position);
field.TypeName = token.Value;
CompileShaderField(field, t);
fields.Add(field);
}
return(fields);
}
private static void CompileShaderField(ShaderField field, ZScriptTokenizer t)
{
ZScriptToken token;
// read name and array dimensions
while (true)
{
t.SkipWhitespace();
token = t.ExpectToken(ZScriptTokenType.OpenSquare, ZScriptTokenType.Identifier);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected array dimensions or field name, got {0}", token?.ToString() ?? "<EOF>");
}
// array finished
if (token.Type == ZScriptTokenType.Identifier)
{
field.Name = token.Value;
break;
}
// read array
List <ZScriptToken> arrayDimTokens = ReadEverythingUntil(t, ZScriptTokenType.CloseSquare, false, false);
if (field.ArrayDimensions == null)
{
field.ArrayDimensions = new List <List <ZScriptToken> >();
}
field.ArrayDimensions.Add(arrayDimTokens);
token = t.ExpectToken(ZScriptTokenType.CloseSquare);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected closing square brace, got {0}", token?.ToString() ?? "<EOF>");
}
}
// read additional array dimensions if present, and initializer. or end parsing
while (true)
{
t.SkipWhitespace();
token = t.ExpectToken(ZScriptTokenType.OpenSquare, ZScriptTokenType.OpAssign, ZScriptTokenType.Semicolon);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected array dimensions, initializer or semicolon, got {0}", token?.ToString() ?? "<EOF>");
}
// field is done
if (token.Type == ZScriptTokenType.Semicolon)
{
break;
}
// has initializer
if (token.Type == ZScriptTokenType.OpAssign)
{
field.Initializer = ReadEverythingUntil(t, ZScriptTokenType.Semicolon, false, false);
token = t.ExpectToken(ZScriptTokenType.Semicolon);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected semicolon, got {0}", token?.ToString() ?? "<EOF>");
}
break;
}
// read array
List <ZScriptToken> arrayDimTokens = ReadEverythingUntil(t, ZScriptTokenType.CloseSquare, false, false);
if (field.ArrayDimensions == null)
{
field.ArrayDimensions = new List <List <ZScriptToken> >();
}
field.ArrayDimensions.Add(arrayDimTokens);
token = t.ExpectToken(ZScriptTokenType.CloseSquare);
if (!(token?.IsValid ?? true))
{
throw new ShaderCompileException("Expected closing square brace, got {0}", token?.ToString() ?? "<EOF>");
}
}
}
