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Orka |
/*
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ORSoC GFX accelerator core
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Copyright 2012, ORSoC, Per Lenander, Anton Fosselius.
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Components for aligning colored pixels to memory and the inverse
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This file is part of orgfx.
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orgfx is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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orgfx is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with orgfx. If not, see <http://www.gnu.org/licenses/>.
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*/
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module color_to_memory(color_depth_i, color_i, x_lsb_i,
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mem_o, sel_o);
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input [1:0] color_depth_i;
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input [31:0] color_i;
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input [1:0] x_lsb_i;
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output [31:0] mem_o;
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output [3:0] sel_o;
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assign sel_o = (color_depth_i == 2'b00) && (x_lsb_i == 2'b00) ? 4'b1000 : // 8-bit
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(color_depth_i == 2'b00) && (x_lsb_i == 2'b01) ? 4'b0100 : // 8-bit
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(color_depth_i == 2'b00) && (x_lsb_i == 2'b10) ? 4'b0010 : // 8-bit
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(color_depth_i == 2'b00) && (x_lsb_i == 2'b11) ? 4'b0001 : // 8-bit
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(color_depth_i == 2'b01) && (x_lsb_i[0] == 1'b0) ? 4'b1100 : // 16-bit, high word
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(color_depth_i == 2'b01) && (x_lsb_i[0] == 1'b1) ? 4'b0011 : // 16-bit, low word
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4'b1111; // 32-bit
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assign mem_o = (color_depth_i == 2'b00) && (x_lsb_i == 2'b00) ? {color_i[7:0], 24'h000000} : // 8-bit
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(color_depth_i == 2'b00) && (x_lsb_i == 2'b01) ? {color_i[7:0], 16'h0000} : // 8-bit
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(color_depth_i == 2'b00) && (x_lsb_i == 2'b10) ? {color_i[7:0], 8'h00} : // 8-bit
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(color_depth_i == 2'b00) && (x_lsb_i == 2'b11) ? {color_i[7:0]} : // 8-bit
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(color_depth_i == 2'b01) && (x_lsb_i[0] == 1'b0) ? {color_i[15:0], 16'h0000} : // 16-bit, high word
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(color_depth_i == 2'b01) && (x_lsb_i[0] == 1'b1) ? {color_i[15:0]} : // 16-bit, low word
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color_i; // 32-bit
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endmodule
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module memory_to_color(color_depth_i, mem_i, mem_lsb_i,
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color_o, sel_o);
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input [1:0] color_depth_i;
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input [31:0] mem_i;
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input [1:0] mem_lsb_i;
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output [31:0] color_o;
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output [3:0] sel_o;
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assign sel_o = color_depth_i == 2'b00 ? 4'b0001 : // 8-bit
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color_depth_i == 2'b01 ? 4'b0011 : // 16-bit, low word
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4'b1111; // 32-bit
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assign color_o = (color_depth_i == 2'b00) && (mem_lsb_i == 2'b00) ? {mem_i[31:24]} : // 8-bit
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(color_depth_i == 2'b00) && (mem_lsb_i == 2'b01) ? {mem_i[23:16]} : // 8-bit
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(color_depth_i == 2'b00) && (mem_lsb_i == 2'b10) ? {mem_i[15:8]} : // 8-bit
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(color_depth_i == 2'b00) && (mem_lsb_i == 2'b11) ? {mem_i[7:0]} : // 8-bit
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(color_depth_i == 2'b01) && (mem_lsb_i[0] == 1'b0) ? {mem_i[31:16]} : // 16-bit, high word
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(color_depth_i == 2'b01) && (mem_lsb_i[0] == 1'b1) ? {mem_i[15:0]} : // 16-bit, low word
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mem_i; // 32-bit
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endmodule
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