GfxCruncher

// Pixel -- X,Y,Color (19)
// Line -- X1, X2, Y1, Y2, Color (35)
// Triangle -- X1, X2, X3, Y1, Y2, Y3, Color, Fill (54)
// Rectangle -- X1, X2, X3, X4, Y1, Y2, Y3, Y4, Color, Fill (70)

#define PIXEL     2'b00
#define LINE      2'b01
#define TRIANGLE  2'b10
#define RECTANGLE 2'b11

#define MAGENTA 3'b101

module GfxCruncher (
    input [1:0] type,
    input [69:0] data,
    input ce,
    output reg [7:0] row, column,
    output reg [2:0] pixel
    );

    integer r, c;

    always @ (type or data) begin
        if (ce) begin
            case (type)
                PIXEL: begin
                    row = data[7:0];
                    column = data[15:8];
                    pixel = data[18:16];
                end
                LINE: begin
                    pixel = data[34:32];
                    if (data[23:16] ) begin
                        for (r = data[23:16]; r <= data[31:24]; r = r + 1) begin
                            row = r;
                            for (c = data[7:0]; c <= data[15:8]; c = c + 1) begin
                                column = c;
                            end
                        end
                    end
                end
                TRIANGLE:;
                RECTANGLE:;
                default: begin
                    row = 8'b0;
                    column = 8'b0;
                    pixel = MAGENTA;
                end
            endcase
        end
    end

endmodule