//zaddom2
module fpga2018a (CLOCK_27, VGA_HS, VGA_VS, VGA_R, VGA_B, VGA_G);
output reg VGA_HS;
output reg VGA_VS;
output reg [9:0] VGA_R;
output reg [9:0] VGA_G;
output reg [9:0] VGA_B;
input [1:0] CLOCK_27;

parameter FRONT_PORCH_A = 16;
parameter SYNC_PULSE_B = 96;
parameter BACK_PORCH_C = 48;
parameter ACTIVE_VIDEO_D = 640;

parameter V_FRONT_PORCH_A = 10;
parameter V_SYNC_PULSE_B = 2;
parameter V_BACK_PORCH_C = 33;
parameter V_ACTIVE_VIDEO_D = 480;

wire VGA_CLK;
a u0 (
        .clk_res_reset (0), // clk_res.reset
        .clk_out_clk   (VGA_CLK),   // clk_out.clk
        .clk_in_clk    (CLOCK_27)     //  clk_in.clk
);

reg [9:0] HS_count;
//HS signal generator
always @(posedge VGA_CLK)
begin
 if (HS_count < FRONT_PORCH_A + SYNC_PULSE_B + BACK_PORCH_C + ACTIVE_VIDEO_D)
 HS_count <= HS_count + 1;
 else
 HS_count <= 0;

 if (HS_count < SYNC_PULSE_B)
 VGA_HS <= 0;
 else
 VGA_HS <= 1;
end

reg [9:0] VS_count;
//HS signal generator
always @(posedge VGA_CLK)
begin
 if (HS_count==0)
 begin
 if (VS_count < V_FRONT_PORCH_A + V_SYNC_PULSE_B + V_BACK_PORCH_C + V_ACTIVE_VIDEO_D)
 VS_count <= VS_count +1;
 else
 VS_count <= 0;

 if (VS_count < V_SYNC_PULSE_B)
 VGA_VS <= 0;
 else
 VGA_VS <=1;
 end
end

 wire IS_VGA_DISPLAY;
 assign IS_VGA_DISPLAY = ((HS_count >= BACK_PORCH_C + SYNC_PULSE_B && HS_count <= BACK_PORCH_C + SYNC_PULSE_B +
 ACTIVE_VIDEO_D && VS_count >= V_BACK_PORCH_C + V_SYNC_PULSE_B && VS_count <= V_BACK_PORCH_C + V_SYNC_PULSE_B + V_ACTIVE_VIDEO_D));

 wire [9:0] pos_x, pos_y;
 assign pos_x = HS_count - (BACK_PORCH_C + SYNC_PULSE_B);
 assign pos_y = VS_count - (V_BACK_PORCH_C + V_SYNC_PULSE_B);

 always
 begin
	if (IS_VGA_DISPLAY)
		begin
			if ( (pos_y >= (240/215)*pos_x) && pos_y <= 240 && pos_x >=0 && pos_x <= 240)
				begin
					VGA_R = 0;
					VGA_G = 7;
					VGA_B = 1;
				end
			else if ( pos_y > 240 && (pos_y <= ((-1)*((240/215)*pos_x)+480)) && pos_x >=0 && pos_x <= 240 )
				begin
					VGA_R = 0;
					VGA_G = 7;
					VGA_B = 1;
				end
			else if (pos_x >= 0 && pos_x <= 640 && pos_y >= 0 && pos_y < 160)
				begin
					VGA_R = 220;
					VGA_G = 16;
					VGA_B = 52;
				end
			else if (pos_x >= 0 && pos_x <= 640 && pos_y >= 160 && pos_y < 320)
				begin
					VGA_R = 255;
					VGA_G = 255;
					VGA_B = 255;
				end
			else if (pos_x >= 0 && pos_x <= 640 && pos_y >= 320 && pos_y <= 480)
				begin
					VGA_R = 0;
					VGA_G = 0;
					VGA_B = 0;
				end
			else
			begin
				VGA_B = 0;
				VGA_G = 0;
				VGA_R = 0;
			end

		end
 end

endmodule