32Bit_Computer/GPU_Core.sv at master · Chrisake/32Bit_Computer · GitHub

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module GPU_Core(
	input logic Clock,
	input logic Reset,
	input logic [95:0] Instruction,
	output logic ReadInstruction,
	input logic InstructionValid,
	output logic [43:0] PixelInstruction,
	output logic WriteInstruction,
	input logic Ready
	);
	logic [9:0] Current_x,Start_x,End_x;
	logic [8:0] Current_y,Start_y,End_y;
	logic [7:0] Current_Red,Current_Green,Current_Blue;

	logic[3:0] CurrentState;
	logic[95:0] CurrentInstruction;

	enum logic[3:0]{
		Idle=4'b0000,
		Decode=4'b0001,
		Line0=4'b0010,
		Line1=4'b0011,
		Pixel0=4'b0100,
		Pixel1=4'b0101,
		Rectangle0=4'b0110,
		Rectangle1=4'b0111
	}States;

	enum logic[3:0]{
		Pixel=4'b0001,
		Line=4'b0010,
		Rectangle=4'b0011,
		Circle=4'b0100,
		Arc=4'b0101
	}OpCodes;

	always_ff @(posedge Clock)
	begin
		case(CurrentState)
			Idle:
			begin
				if(InstructionValid)
				begin
					CurrentInstruction<=Instruction;
					CurrentState<=Decode;
				end
			end
			Decode:
			begin
				Current_Red<=CurrentInstruction[47:40];
				Current_Green<=CurrentInstruction[39:32];
				Current_Blue<=CurrentInstruction[31:24];
				case(CurrentInstruction[95:92])
					Pixel:
					begin
						Start_x<=CurrentInstruction[91:82];
						Current_x<=CurrentInstruction[91:82];
						End_x<=CurrentInstruction[72:63];
						Start_y<=CurrentInstruction[81:73];
						Current_y<=CurrentInstruction[81:73];
						End_y<=CurrentInstruction[62:54];
						CurrentState<=Pixel0;
					end
					Line:
					begin
						Start_x<=CurrentInstruction[91:82];
						Current_x<=CurrentInstruction[91:82];
						End_x<=CurrentInstruction[72:63];
						Start_y<=CurrentInstruction[81:73];
						Current_y<=CurrentInstruction[81:73];
						End_y<=CurrentInstruction[62:54];
						CurrentState<=Line0;
					end
					Rectangle:
					begin
						Start_x<=CurrentInstruction[91:82];
						Current_x<=CurrentInstruction[91:82];
						End_x<=CurrentInstruction[72:63];
						Start_y<=CurrentInstruction[81:73];
						Current_y<=CurrentInstruction[81:73];
						End_y<=CurrentInstruction[62:54];
						CurrentState<=Rectangle0;
					end
					default:
					begin
						CurrentState<=Idle;
					end
				endcase
			end
			Pixel0:
			begin
				PixelInstruction<={Current_y,Current_x,Current_Red,Current_Green,Current_Blue};
				WriteInstruction<=1;
				CurrentState<=Pixel1;
			end
			Pixel1:
			begin
				if(Ready)
				begin
					CurrentInstruction<=Idle;
					WriteInstruction<=0;
				end
			end
			Line0:
			begin
				PixelInstruction<={Current_y,Current_x,Current_Red,Current_Green,Current_Blue};
				WriteInstruction<=1;
				CurrentState<=Line1;
			end
			Line1:
			begin
				if(Ready)
				begin
					WriteInstruction<=0;
					if(Current_x==End_x)
					begin
						CurrentInstruction<=Idle;
					end else begin
						Current_x<=Current_x+1;
						CurrentState<=Line0;
					end
				end
			end
			Rectangle0:
			begin
				PixelInstruction<={Current_y,Current_x,Current_Red,Current_Green,Current_Blue};
				WriteInstruction<=1;
				CurrentState<=Rectangle1;
			end
			Rectangle1:
			begin
				if(Ready)
				begin
					WriteInstruction<=0;
					if(Current_x==End_x)
					begin
						if(Current_y==End_y)
						begin
							CurrentInstruction<=Idle;
						end
						else
						begin
							Current_x<=Start_x;
							Current_y<=Current_y+1;
						end
					end else begin
						Current_x<=Current_x+1;
						CurrentState<=Rectangle0;
					end
				end
			end
		endcase
	end

endmodule