public void AddShader(ShaderDefinition shader)
{
if (!_shaders.Contains(shader))
{
_shaders.Add(shader);
}
}
private static List <ShaderProgram> TryPreprocess(string sourceCode)
{
// split into lines.
var lines = sourceCode.Split(Environment.NewLine);
// Find all Thundershock preprocessor macros.
var macros = new List <PreprocessorMacro>();
var i = 0;
foreach (var line in lines)
{
var lookFor = "#pragma ts ";
var pragmaTs = line.IndexOf(lookFor, StringComparison.Ordinal);
if (pragmaTs >= 0)
{
var content = line.Substring(pragmaTs + lookFor.Length);
var data = new PreprocessorMacro
{
Line = i,
Index = pragmaTs,
Length = lookFor.Length + content.Length,
Content = content
};
macros.Add(data);
}
i++;
}
// Now we can go through the macros.
var inProgram = false;
var inShader = false;
var program = null as ShaderProgram;
var shader = null as ShaderDefinition;
var shaderStart = -1;
var programs = new List <ShaderProgram>();
foreach (var macro in macros)
{
if (string.IsNullOrWhiteSpace(macro.Content))
{
Logger.GetLogger()
.Log(
$"Shader preprocessor: Warning PP1 (ln {macro.Line} ch {macro.Index}): Empty macro. Ignoring.",
LogLevel.Warning);
continue;
}
// Tokenize the preprocessor command.
var command = macro.Content.Split(' ', StringSplitOptions.RemoveEmptyEntries);
var name = command.First();
var args = command.Skip(1).ToArray();
if (name == "program")
{
if (inProgram)
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Cannot define a new program inside the scope of another program. Did you forget a #pragma ts end?");
}
if (!args.Any())
{
throw new ShaderPreprocessorException(macro.Line, macro.Index, "Missing program name!");
}
program = new ShaderProgram(args.First());
inProgram = true;
continue;
}
if (name == "shader")
{
if (inShader)
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Cannot define a shader inside the scope of another shader. Did you forget a #pragma ts end?");
}
if (!inProgram)
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Shaders must be defined inside the scope of a Program.");
}
if (!args.Any())
{
throw new ShaderPreprocessorException(macro.Line, macro.Index, "Missing shader name!");
}
shader = new ShaderDefinition(args.First());
shaderStart = macro.Line + 1;
inShader = true;
continue;
}
if (name == "compile")
{
if (inShader)
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Cannot define a shader compilation inside the scope of a shader. Did you forget a #pragma ts end?");
}
if (!inProgram)
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Cannot define a shader compilation outside the scope of a Program.");
}
if (args.Length < 2)
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Missing como;e type and shader name!");
}
var sType = args[0];
var sName = args[1];
var type = sType switch
{
"vert" => ShaderCompilation.VertexShader,
"frag" => ShaderCompilation.FragmentShader,
_ => throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Unsupported shader type " + sType + ".")
};
if (!program.HasShader(sName))
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Shader " + sName + " not defined in the program!");
}
if (program.WillCompile(sName))
{
throw new ShaderPreprocessorException(macro.Line, macro.Index,
"Shader compilation has already been defined.");
}
program.SetCompileType(sName, type);
continue;
}
if (name == "end")
{
if (inShader)
{
var srcBuilder = new StringBuilder();
for (var l = shaderStart; l < macro.Line; l++)
{
var sLine = lines[l];
if (l == macro.Line)
{
sLine = sLine.Substring(0, macro.Index);
}
srcBuilder.AppendLine(sLine);
}
shader.SourceCode = srcBuilder.ToString();
program.AddShader(shader);
shader = null;
shaderStart = -1;
inShader = false;
continue;
}
if (inProgram)
{
if (!program.HasCompilations)
{
Logger.GetLogger().Log("Empty shader program detected!", LogLevel.Warning);
continue;
}
programs.Add(program);
inProgram = false;
program = null;
continue;
}
}
}
return(programs);
}