public DrawCall(DrawFunc drawfunc, PrimType mode, ElementType indextype, List <int> arg)
{
this.mode = mode;
this.indextype = indextype;
// iBaseVertex, vBaseVertex, voStream, indirectPtr
arg0 = arg.Count > 0 ? arg[0] : 0;
// iBaseIndex, vVertexCount, indirectCount
arg1 = arg.Count > 1 ? arg[1] :
drawfunc == DrawFunc.TransformFeedback ||
drawfunc == DrawFunc.ArraysIndirect ||
drawfunc == DrawFunc.ElementsIndirect
? 1
: 0;
// iIndexCount, vBaseInstance, indirectStride
arg2 = arg.Count > 2 ? arg[2] :
drawfunc == DrawFunc.TransformFeedback
? 1
: drawfunc == DrawFunc.ArraysIndirect
? 16
: drawfunc == DrawFunc.ElementsIndirect
? 32
: 0;
// iBaseInstance, vInstanceCount
arg3 = arg.Count > 3 ? arg[3] :
drawfunc == DrawFunc.ArraysInstanced ? 1 : 0;
// iInstanceCount
arg4 = arg.Count > 4 ? arg[4] :
drawfunc == DrawFunc.ElementsInstanced ? 1 : 0;
}
private void ParseDrawCall(Compiler.Command cmd, Dict classes, CompileException err)
{
var args = new List <int>();
GLVertinput vertexin = null;
GLVertoutput vertout = null;
GLBuffer indexbuf = null;
GLBuffer indirect = null;
bool modeIsSet = false;
bool typeIsSet = false;
PrimType primitive = 0;
ElementType indextype = 0;
// parse draw call arguments
foreach (var arg in cmd)
{
if (classes.TryGetValue(arg.Text, ref vertexin))
{
continue;
}
if (classes.TryGetValue(arg.Text, ref vertout))
{
continue;
}
if (classes.TryGetValue(arg.Text, ref indexbuf))
{
continue;
}
if (classes.TryGetValue(arg.Text, ref indirect))
{
continue;
}
if (int.TryParse(arg.Text, out int val))
{
args.Add(val);
}
else if (typeIsSet == false && Enum.TryParse(arg.Text, true, out indextype))
{
typeIsSet = true;
}
else if (modeIsSet == false && Enum.TryParse(arg.Text, true, out primitive))
{
modeIsSet = true;
}
else
{
err.Add($"Unable to process argument '{arg.Text}'.", cmd);
}
}
if (err.HasErrors)
{
return;
}
// a draw call must specify a primitive type
if (modeIsSet == false)
{
err.Add("Draw call must specify a primitive type (e.g. triangles, "
+ "trianglefan, lines, points, ...).", cmd);
return;
}
// determine the right draw call function
int bits = (vertout != null ? 1 : 0)
| (indexbuf != null ? 2 : 0)
| (indirect != null ? 4 : 0)
| (typeIsSet ? 8 : 0);
if (!Enum.IsDefined(typeof(DrawFunc), bits))
{
err.Add("Draw call function not recognized or ambiguous.", cmd);
return;
}
var drawfunc = (DrawFunc)bits;
// get index buffer object (if present) and find existing MultiDraw class
var multidrawcall = drawcalls.Find(
x => x.vertexin == (vertexin != null ? vertexin.glname : 0) &&
x.indexbuf == (indexbuf != null ? indexbuf.glname : 0) &&
x.vertout == (vertout != null ? vertout.glname : 0) &&
x.indirect == (indirect != null ? indirect.glname : 0))
?? new MultiDrawCall(drawfunc, vertexin, vertout, indexbuf, indirect);
// add new draw command to the MultiDraw class
multidrawcall.cmd.Add(new DrawCall(drawfunc, primitive, indextype, args));
drawcalls.Add(multidrawcall);
}