public void AppendTable(ASMTable table)
{
AppendLabel(table.Name);
foreach (var entry in table)
{
AppendCode(entry.ToString());
}
}
/// <summary>
/// Generates the code for the desired effect
/// </summary>
/// <param name="channel"></param>
/// <param name="table"></param>
/// <param name="sa1"></param>
/// <returns></returns>
public override string Code(int channel, HDMATable table, bool sa1)
{
int Base = 0x4300 + (channel * 0x10);
int Register = (int)Layers;
int BaseAddress = RAM.Layer1X[sa1] + ((int)Layers - (int)LayerRegister.Layer1_X) * 2;
int RegMode = ((Register & 0xFF) << 8) + 0x02;
int LSRs = (int)((1.0 / _speed) / 2.0);
int Tablesize = (Scanlines / _width) >= 15 ? 15 : (Scanlines / _width);
int TableInRAM = CountRAMBytes();
string tableString = "The Table takes up " + TableInRAM + " bytes of the free RAM\n" +
"It ranges from $" + FreeRAM.ToString("X6") + " - $" + (FreeRAM + TableInRAM - 1).ToString("X6") + " (both addresses included)";
ASMTable codeTable = new ASMTable(".WaveTable");
for (int i = 0; i <= Tablesize; i++)
{
codeTable.Add(new ASMTableEntry((byte)_IArr[i]));
}
char xy = (((int)Layers & 0x01) == 0 ? 'Y' : 'X');
ASMCodeBuilder CodeBuilder = new ASMCodeBuilder();
CodeBuilder.OpenNewBlock();
CodeBuilder.AppendLabel(INITLabel, "This section is to be used in the INIT code of levelASM");
CodeBuilder.AppendCode("REP #$20");
CodeBuilder.AppendCode("LDA #$" + RegMode.ToASMString(), "Use Mode 02 on register " + Register.ToASMString());
CodeBuilder.AppendCode("STA $" + Base.ToASMString(), "43" + Channel + "0 = Mode, 43" + Channel + "1 = Register");
CodeBuilder.AppendCode("LDA #$" + (FreeRAM & 0xFFFF).ToASMString(), "Address of HDMA table");
CodeBuilder.AppendCode("STA $" + (Base + 2).ToASMString(), "43" + Channel + "2 = Low-Byte of table, 43" + Channel + "3 = High-Byte of table");
CodeBuilder.AppendCode("SEP #$20");
CodeBuilder.AppendCode("LDA.b #$" + (FreeRAM >> 16).ToASMString(), "Address of HDMA table, get bank byte");
CodeBuilder.AppendCode("STA $" + (Base + 4).ToASMString(), "43" + Channel + "4 = Bank-Byte of table");
CodeBuilder.AppendCode("LDA #$" + (0x01 << Channel).ToASMString());
CodeBuilder.AppendCode("TSB $" + RAM.HDMAEnable[sa1].ToASMString(), "Enable HDMA channel " + Channel);
CodeBuilder.AppendCode("RTS", "End HDMA setup" + MAINSeperator);
CodeBuilder.CloseBlock();
CodeBuilder.AppendCommentLine(tableString);
CodeBuilder.AppendEmptyLine();
CodeBuilder.OpenNewBlock();
CodeBuilder.AppendLabel(MAINLabel, "This section is to be used in the MAIN code of levelASM");
CodeBuilder.AppendCode("LDY #$00", "Y will be the loop counter.");
CodeBuilder.AppendCode("LDX #$00", "X the index for writing the table to the RAM");
CodeBuilder.AppendCode("LDA $" + RAM.FrameCounter[sa1].ToASMString(), "Speed of waves");
CodeBuilder.AppendCode("LSR #" + LSRs, "Slowing down A");
CodeBuilder.AppendCode("STA $00", "Save for later use.");
CodeBuilder.CloseBlock();
CodeBuilder.AppendEmptyLine();
CodeBuilder.OpenNewBlock();
CodeBuilder.AppendCode("PHB : PHK : PLB", "Preservev bank");
CodeBuilder.AppendLabel(".Loop", "Jump back if not finished writing table");
CodeBuilder.AppendCode("LDA #$" + _width.ToASMString(), "Set scanline height");
CodeBuilder.AppendCode("STA $" + FreeRAM.ToASMString() + ",x", "for each wave");
CodeBuilder.AppendCode("TYA", "Transfer Y to A, to calculate next index");
CodeBuilder.AppendCode("ADC $00", "Add frame counter");
CodeBuilder.AppendCode("AND #$" + Tablesize.ToASMString());
CodeBuilder.AppendCode("PHY", "Preserve loop counter");
CodeBuilder.AppendCode("TAY", "Get the index in Y");
CodeBuilder.CloseBlock();
CodeBuilder.AppendEmptyLine();
CodeBuilder.OpenNewBlock();
CodeBuilder.AppendCode("LDA.w " + codeTable.Name + ",y", "Load in wave value");
CodeBuilder.AppendCode("LSR", "Half only");
CodeBuilder.AppendCode("CLC", "Clear Carry for addition");
CodeBuilder.AppendCode("ADC $" + (BaseAddress).ToASMString(), "Add value to layer " + xy + " position (low byte)");
CodeBuilder.AppendCode("STA $" + (FreeRAM + 1).ToASMString() + ",x", "store to HDMA table (low byte)");
CodeBuilder.AppendCode("LDA $" + (BaseAddress + 1).ToASMString(), "Get high byte of X position");
CodeBuilder.AppendCode("ADC #$00", "Add value to layer X position (low byte)");
CodeBuilder.AppendCode("STA $" + (FreeRAM + 2).ToASMString() + ",x", "store to HDMA table (high byte)");
CodeBuilder.CloseBlock();
CodeBuilder.AppendEmptyLine();
CodeBuilder.OpenNewBlock();
CodeBuilder.AppendCode("PLY", "Pull original loop counter");
CodeBuilder.AppendCode("CPY #$" + (Scanlines / _width).ToASMString(), "Compare if we have written enough HDMA entries.");
CodeBuilder.AppendCode("BPL .End", "If bigger, end HDMA");
CodeBuilder.AppendCode("INX", "Increase X, so that in the next loop, it writes the new table data...");
CodeBuilder.AppendCode("INX", "... at the end of the old one instead of overwritting it.");
CodeBuilder.AppendCode("INX");
CodeBuilder.AppendCode("INY", "Increase loop counter");
CodeBuilder.AppendCode("BRA .Loop", "Repeat loop");
CodeBuilder.CloseBlock();
CodeBuilder.AppendEmptyLine();
CodeBuilder.OpenNewBlock();
CodeBuilder.AppendLabel(".End", "Jump here when at the end of HDMA");
CodeBuilder.AppendCode("PLB", "Pull back data bank.");
CodeBuilder.AppendCode("LDA #$00", "End HDMA by writting 00...");
CodeBuilder.AppendCode("STA $" + (FreeRAM + 3).ToASMString() + ",x", "...at the end of the table.");
CodeBuilder.AppendCode("RTS");
CodeBuilder.CloseBlock();
CodeBuilder.AppendEmptyLine();
CodeBuilder.OpenNewBlock();
CodeBuilder.AppendTable(codeTable);
CodeBuilder.CloseBlock();
return(CodeBuilder.ToString()); // +"\n\n" + tableString;
}