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draw_cloud.sv
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module draw_cloud ( input frame_Clk, Reset,
input [9:0] WriteX, WriteY,
output logic cloud_on_wr,
output logic [17:0] address);
//$readmemh("sprite/cloud_92x27.txt", mem, 44420, 46903);
parameter [17:0] cloud = 18'd44420;
int cloud_X = 92;
int cloud_Y = 27;
int frame_count;
logic [17:0] start, offset;
int PosX, PosY;
int SizeX, SizeY, DistX, DistY;
initial
begin
PosX = 640;
PosY = 100;
frame_count = 1;
end
always_comb
begin
SizeX = cloud_X;
SizeY = cloud_Y;
DistX = WriteX - PosX;
DistY = WriteY - PosY;
end
always_ff @ (posedge frame_Clk or posedge Reset)
begin
if (Reset)
begin
frame_count <= 1;
PosX <= 640;
end
else
begin
if (frame_count == 1)
begin
if (PosX <= -cloud_X)
PosX <= 640;
else
PosX <= PosX - 1;
frame_count <= 1;
end
else
frame_count <= frame_count + 1;
end
end
always_comb
begin
start = cloud;
offset = DistY*SizeX + DistX;
end
assign address = start + offset;
always_comb
begin:Cloud_on_wr_proc
if ((WriteX >= PosX || PosX<0) &&
(WriteX < PosX + cloud_X ) &&
(WriteY >= PosY) &&
(WriteY < PosY + cloud_Y))
cloud_on_wr = 1'b1;
else
cloud_on_wr = 1'b0;
end
endmodule