`include "VX_tex_define.vh"

module VX_tex_format #(
    parameter CORE_ID = 0
) (
    input wire [`TEX_FORMAT_BITS-1:0] format,
    input wire [31:0]   texel_in,    
    output wire [31:0]  texel_out
);  
    `UNUSED_PARAM (CORE_ID)

    reg [31:0] texel_out_r;

    always @(*) begin        
        case (format)
        `TEX_FORMAT_R5G6B5: begin
            texel_out_r[07:00] = `TEX_COLOR_BITS'({texel_in[15:11],texel_in[15:13]});  
            texel_out_r[15:08] = `TEX_COLOR_BITS'({texel_in[10:5],texel_in[10:9]});
            texel_out_r[23:16] = `TEX_COLOR_BITS'({texel_in[4:0],texel_in[4:2]});
            texel_out_r[31:24] = {`TEX_COLOR_BITS{1'b1}};
        end
        `TEX_FORMAT_R4G4B4A4: begin
            texel_out_r[07:00] = `TEX_COLOR_BITS'({texel_in[11:8],texel_in[15:12]});
            texel_out_r[15:08] = `TEX_COLOR_BITS'({2{texel_in[7:4]}});
            texel_out_r[23:16] = `TEX_COLOR_BITS'({2{texel_in[3:0]}});
            texel_out_r[31:24] = `TEX_COLOR_BITS'({2{texel_in[15:12]}});
        end
        `TEX_FORMAT_L8A8: begin
            texel_out_r[07:00] = `TEX_COLOR_BITS'(texel_in[7:0]);
            texel_out_r[15:08] = `TEX_COLOR_BITS'(texel_in[7:0]);
            texel_out_r[23:16] = `TEX_COLOR_BITS'(texel_in[7:0]);
            texel_out_r[31:24] = `TEX_COLOR_BITS'(texel_in[15:8]);
        end
        `TEX_FORMAT_A8: begin
            texel_out_r[07:00] = `TEX_COLOR_BITS'(0);
            texel_out_r[15:08] = `TEX_COLOR_BITS'(0);
            texel_out_r[23:16] = `TEX_COLOR_BITS'(0);
            texel_out_r[31:24] = `TEX_COLOR_BITS'(texel_in[7:0]);
        end
        `TEX_FORMAT_L8: begin
            texel_out_r[07:00] = `TEX_COLOR_BITS'(texel_in[7:0]);
            texel_out_r[15:08] = `TEX_COLOR_BITS'(texel_in[7:0]);
            texel_out_r[23:16] = `TEX_COLOR_BITS'(texel_in[7:0]);
            texel_out_r[31:24] = {`TEX_COLOR_BITS{1'b1}};
        end
        // `TEX_FORMAT_R8G8B8A8
        default: begin 
            texel_out_r[07:00] = `TEX_COLOR_BITS'(texel_in[7:0]);
            texel_out_r[15:08] = `TEX_COLOR_BITS'(texel_in[15:8]);
            texel_out_r[23:16] = `TEX_COLOR_BITS'(texel_in[23:16]);
            texel_out_r[31:24] = `TEX_COLOR_BITS'(texel_in[31:24]);
        end
        endcase
    end

    assign texel_out = texel_out_r;

endmodule