FOMU VGA demo

Basic/FOMU/FOMU_VGA/vga.v

@@ -27,8 +27,8 @@ module vga (
 
    wire   pixel_clk;
 
-`define VGA_MODE_640x480
-//`define VGA_MODE_1024x768
+//`define VGA_MODE_640x480
+`define VGA_MODE_1024x768
 //`define VGA_MODE_1280x1024
 
 `ifdef VGA_MODE_640x480
@@ -138,12 +138,22 @@ module vga (
    end
 
    wire [1:0] out_color;
+   
+   // Demo 1
    wire signed [11:0] dx = $signed(VGA_X) - VGA_width/2;
    wire signed [11:0] dy = $signed(VGA_Y) - VGA_height/2;
    wire signed [15:0] R2 = dx*dx + dy*dy - $signed(VGA_frame << 6);
+   wire [1:0] demo_1 = {R2[12],R2[13]};
 
-   assign out_color = VGA_DrawArea ? {R2[12],R2[13]} : 2'b00;
+   // Demo 2
+   wire b1 = ((((VGA_Y >> 1) - VGA_frame) ^ VGA_X >> 1)%10'd9 == 1);
+   wire b2 = (((VGA_Y - (VGA_frame >> 1))^ VGA_X)%10'd13 == 1);
+   wire [1:0] demo_2 = {b1,b2};
+   
+   assign out_color = !VGA_DrawArea ? 2'b00 :
+                       VGA_frame[8] ? demo_1 : demo_2 ;
 
+   
    assign user_1 = VGA_hSync;
    assign user_2 = VGA_vSync;
    assign user_3 = out_color[0];