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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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PER-PIXEL COLORING MODULE
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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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/*
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This module adds color to the pixel generated by the rasterizer. It can either draw a flat color (using pixel_color_i) or
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colors from a texture by using the u and v coordinates generated by the rasterizer.
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*/
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module gfx_fragment_processor(clk_i, rst_i,
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pixel_alpha_i,
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x_counter_i, y_counter_i, z_i, u_i, v_i, bezier_factor0_i, bezier_factor1_i, bezier_inside_i, write_i, curve_write_i, ack_o, // from raster
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pixel_x_o, pixel_y_o, pixel_z_o, pixel_color_i, pixel_color_o, pixel_alpha_o, write_o, ack_i, // to blender
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texture_ack_i, texture_data_i, texture_addr_o, texture_sel_o, texture_request_o, // to/from wishbone master read
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texture_enable_i, tex0_base_i, tex0_size_x_i, tex0_size_y_i, color_depth_i, colorkey_enable_i, colorkey_i // from wishbone slave
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);
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parameter point_width = 16;
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input clk_i;
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input rst_i;
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input [7:0] pixel_alpha_i;
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// from raster
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input [point_width-1:0] x_counter_i;
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input [point_width-1:0] y_counter_i;
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input signed [point_width-1:0] z_i;
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input [point_width-1:0] u_i; // x-ish texture coordinate
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input [point_width-1:0] v_i; // y-ish texture coordinate
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input [point_width-1:0] bezier_factor0_i; // Used for curve writing
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input [point_width-1:0] bezier_factor1_i; // Used for curve writing
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input bezier_inside_i;
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input [31:0] pixel_color_i;
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input write_i;
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input curve_write_i;
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output reg ack_o;
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//to render
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output reg [point_width-1:0] pixel_x_o;
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output reg [point_width-1:0] pixel_y_o;
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output reg signed [point_width-1:0] pixel_z_o;
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output reg [31:0] pixel_color_o;
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output reg [7:0] pixel_alpha_o;
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output reg write_o;
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input ack_i;
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// to/from wishbone master read
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input texture_ack_i;
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input [31:0] texture_data_i;
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output [31:2] texture_addr_o;
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output reg [ 3:0] texture_sel_o;
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output reg texture_request_o;
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// from wishbone slave
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input texture_enable_i;
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input [31:2] tex0_base_i;
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input [point_width-1:0] tex0_size_x_i;
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input [point_width-1:0] tex0_size_y_i;
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input [ 1:0] color_depth_i;
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input colorkey_enable_i;
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input [31:0] colorkey_i;
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wire [31:0] pixel_offset;
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// Calculate the memory address of the texel to read
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assign pixel_offset = (color_depth_i == 2'b00) ? (tex0_size_x_i*v_i + {16'h0, u_i}) : // 8 bit
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(color_depth_i == 2'b01) ? (tex0_size_x_i*v_i + {16'h0, u_i}) << 1 : // 16 bit
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(tex0_size_x_i*v_i + {16'h0, u_i}) << 2 ; // 32 bit
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assign texture_addr_o = tex0_base_i + pixel_offset[31:2];
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// State machine
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reg [1:0] state;
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parameter wait_state = 2'b00, texture_read_state = 2'b01, write_pixel_state = 2'b10;
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wire [31:0] mem_conv_color_o;
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// Color converter
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memory_to_color color_proc(
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.color_depth_i (color_depth_i),
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.mem_i (texture_data_i),
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.mem_lsb_i (u_i[1:0]),
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.color_o (mem_conv_color_o),
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.sel_o ()
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);
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// Does the fetched texel match the colorkey?
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wire transparent_pixel = (color_depth_i == 2'b00) ? (mem_conv_color_o[7:0] == colorkey_i[7:0]) : // 8 bit
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(color_depth_i == 2'b01) ? (mem_conv_color_o[15:0] == colorkey_i[15:0]) : // 16 bit
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(mem_conv_color_o == colorkey_i); // 32 bit
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// These variables are used when rendering bezier shapes. If bezier_draw is true, pixel is drawn, if it is false, pixel is discarded.
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// These variables are only used if curve_write_i is high
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// Calculate if factor0*factor0 > factor1
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// Values are in the range [0..1], represented by a [point_width-1:0] bit array
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wire [2*point_width-1:0] bezier_factor0_squared = bezier_factor0_i*bezier_factor0_i;
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wire bezier_eval = bezier_factor0_squared[2*point_width-1:point_width] > bezier_factor1_i;
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wire bezier_draw = bezier_inside_i ^ bezier_eval; // inside xor eval
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// Acknowledge when a command has completed
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always @(posedge clk_i or posedge rst_i)
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begin
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// reset, init component
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if(rst_i)
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begin
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ack_o <= 1'b0;
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write_o <= 1'b0;
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pixel_x_o <= 1'b0;
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pixel_y_o <= 1'b0;
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pixel_z_o <= 1'b0;
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pixel_color_o <= 1'b0;
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pixel_alpha_o <= 1'b0;
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texture_request_o <= 1'b0;
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texture_sel_o <= 4'b1111;
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end
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// Else, set outputs for next cycle
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else
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begin
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case (state)
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wait_state:
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begin
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ack_o <= write_i & curve_write_i & ~bezier_draw;
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if(write_i & texture_enable_i & (~curve_write_i | bezier_draw))
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texture_request_o <= 1'b1;
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else if(write_i & (~curve_write_i | bezier_draw))
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begin
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pixel_x_o <= x_counter_i;
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pixel_y_o <= y_counter_i;
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pixel_z_o <= z_i;
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pixel_color_o <= pixel_color_i;
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pixel_alpha_o <= pixel_alpha_i;
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write_o <= 1'b1; // Note, colorkey only supported for texture reads
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end
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end
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texture_read_state:
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if(texture_ack_i)
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begin
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pixel_x_o <= x_counter_i;
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pixel_y_o <= y_counter_i;
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pixel_z_o <= z_i;
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pixel_color_o <= mem_conv_color_o;
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pixel_alpha_o <= pixel_alpha_i;
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texture_request_o <= 1'b0;
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if(colorkey_enable_i & transparent_pixel)
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ack_o <= 1'b1; // Colorkey enabled: Only write if the pixel doesn't match the colorkey
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else
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write_o <= 1'b1;
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end
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write_pixel_state:
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begin
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write_o <= 1'b0;
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ack_o <= ack_i;
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end
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endcase
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end
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end
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// State machine
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always @(posedge clk_i or posedge rst_i)
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begin
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// reset, init component
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if(rst_i)
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state <= wait_state;
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// Move in statemachine
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else
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case (state)
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wait_state:
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if(write_i & texture_enable_i & (~curve_write_i | bezier_draw))
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state <= texture_read_state;
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else if(write_i & (~curve_write_i | bezier_draw))
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state <= write_pixel_state;
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texture_read_state:
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// Check for texture ack. If we have colorkeying enabled, only goto the write state if the texture doesn't match the colorkey
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if(texture_ack_i & colorkey_enable_i)
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state <= transparent_pixel ? wait_state : write_pixel_state;
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else if(texture_ack_i)
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state <= write_pixel_state;
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write_pixel_state:
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if(ack_i)
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state <= wait_state;
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endcase
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end
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endmodule
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