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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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RASTERIZER 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 takes a rect write or line write request and generates pixels in the span given by dest_pixel0-1.
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Triangles can be declared by dest_pixel0-2, they are handled by the triangle module
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The operation is clipped to the span given by clip_pixel0-1. Pixels outside the span are discarded.
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If texturing is enabled, texture coordinates u (horizontal) and v (vertical) are emitted, offset and clipped by the span given by src_pixel0-1.
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When all pixels have been generated and acked, the rasterizer acks the operation and returns to wait state.
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*/
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module gfx_rasterizer(clk_i, rst_i,
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clip_ack_i, interp_ack_i, ack_o,
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rect_write_i, line_write_i, triangle_write_i, interpolate_i, texture_enable_i,
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//source pixel 0 and pixel 1
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src_pixel0_x_i, src_pixel0_y_i, src_pixel1_x_i, src_pixel1_y_i,
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//destination point 0, 1, 2
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dest_pixel0_x_i, dest_pixel0_y_i,
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dest_pixel1_x_i, dest_pixel1_y_i,
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dest_pixel2_x_i, dest_pixel2_y_i,
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clipping_enable_i,
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//clip pixel 0 and pixel 1
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clip_pixel0_x_i, clip_pixel0_y_i, clip_pixel1_x_i, clip_pixel1_y_i,
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target_size_x_i, target_size_y_i,
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x_counter_o, y_counter_o, u_o,v_o,
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clip_write_o, interp_write_o,
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triangle_edge0_o, triangle_edge1_o, triangle_area_o
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);
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parameter point_width = 16;
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parameter subpixel_width = 16;
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parameter delay_width = 5;
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input clk_i;
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input rst_i;
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input clip_ack_i;
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input interp_ack_i;
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output reg ack_o;
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input rect_write_i;
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input line_write_i;
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input triangle_write_i;
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input interpolate_i;
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input texture_enable_i;
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//src pixels
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input [point_width-1:0] src_pixel0_x_i;
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input [point_width-1:0] src_pixel0_y_i;
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input [point_width-1:0] src_pixel1_x_i;
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input [point_width-1:0] src_pixel1_y_i;
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//dest pixels
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input signed [point_width-1:-subpixel_width] dest_pixel0_x_i;
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input signed [point_width-1:-subpixel_width] dest_pixel0_y_i;
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input signed [point_width-1:-subpixel_width] dest_pixel1_x_i;
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input signed [point_width-1:-subpixel_width] dest_pixel1_y_i;
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input signed [point_width-1:-subpixel_width] dest_pixel2_x_i;
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input signed [point_width-1:-subpixel_width] dest_pixel2_y_i;
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wire signed [point_width-1:0] p0_x = $signed(dest_pixel0_x_i[point_width-1:0]);
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wire signed [point_width-1:0] p0_y = $signed(dest_pixel0_y_i[point_width-1:0]);
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wire signed [point_width-1:0] p1_x = $signed(dest_pixel1_x_i[point_width-1:0]);
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wire signed [point_width-1:0] p1_y = $signed(dest_pixel1_y_i[point_width-1:0]);
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//clip pixels
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input clipping_enable_i;
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input [point_width-1:0] clip_pixel0_x_i;
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input [point_width-1:0] clip_pixel0_y_i;
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input [point_width-1:0] clip_pixel1_x_i;
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input [point_width-1:0] clip_pixel1_y_i;
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input [point_width-1:0] target_size_x_i;
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input [point_width-1:0] target_size_y_i;
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// Generated pixel coordinates
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output reg [point_width-1:0] x_counter_o;
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output reg [point_width-1:0] y_counter_o;
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// Generated texture coordinates
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output reg [point_width-1:0] u_o;
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output reg [point_width-1:0] v_o;
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// Write pixel output signals
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output reg clip_write_o;
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output reg interp_write_o;
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output [2*point_width-1:0] triangle_edge0_o;
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output [2*point_width-1:0] triangle_edge1_o;
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output [2*point_width-1:0] triangle_area_o;
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wire ack_i = interpolate_i ? interp_ack_i : clip_ack_i;
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// Variables used in rect drawing
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reg [point_width-1:0] rect_p0_x;
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reg [point_width-1:0] rect_p0_y;
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reg [point_width-1:0] rect_p1_x;
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reg [point_width-1:0] rect_p1_y;
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//line drawing reg & wires
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wire raster_line_busy; // busy, drawing a line.
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wire x_major; // is true if x is the major axis
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wire valid_out;
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reg draw_line; // trigger the line drawing.
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wire [point_width-1:0] major_out; // the major axis
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wire [point_width-1:0] minor_out; // the minor axis
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wire request_next_pixel;
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// State machine
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reg [2:0] state;
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parameter wait_state = 3'b000,
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rect_state = 3'b001,
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line_state = 3'b010,
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triangle_state = 3'b011,
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triangle_final_state = 3'b100;
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// Write/ack counter
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reg [delay_width-1:0] ack_counter;
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always @(posedge clk_i or posedge rst_i)
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if(rst_i)
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ack_counter <= 1'b0;
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else if(interpolate_i & ack_i & ~triangle_write_o)
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ack_counter <= ack_counter - 1'b1;
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else if(interpolate_i & triangle_write_o & ~ack_i)
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ack_counter <= ack_counter + 1'b1;
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// Rect drawing variables
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always @(posedge clk_i or posedge rst_i)
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begin
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if(rst_i)
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begin
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rect_p0_x <= 1'b0;
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rect_p0_y <= 1'b0;
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rect_p1_x <= 1'b0;
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rect_p1_y <= 1'b0;
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end
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else
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begin
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if(clipping_enable_i)
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begin
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// pixel0 x
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if(p0_x < $signed(clip_pixel0_x_i)) // check if pixel is left of screen
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rect_p0_x <= clip_pixel0_x_i;
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else if(p0_x > $signed(clip_pixel1_x_i)) // check if pixel is right of screen
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rect_p0_x <= clip_pixel1_x_i;
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else
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rect_p0_x <= p0_x;
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// pixel0 y
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if(p0_y < $signed(clip_pixel0_y_i)) // check if pixel is above the screen
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rect_p0_y <= clip_pixel0_y_i;
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else if(p0_y > $signed(clip_pixel1_y_i)) // check if pixel is below the screen
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rect_p0_y <= clip_pixel1_y_i;
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else
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rect_p0_y <= p0_y;
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// pixel1 x
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if(p1_x < $signed(clip_pixel0_x_i)) // check if pixel is left of screen
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rect_p1_x <= clip_pixel0_x_i;
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else if(p1_x > $signed(clip_pixel1_x_i -1)) // check if pixel is right of screen
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rect_p1_x <= clip_pixel1_x_i -1'b1;
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else
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rect_p1_x <= dest_pixel1_x_i[point_width-1:0] - 1;
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// pixel1 y
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if(p1_y < $signed(clip_pixel0_y_i)) // check if pixel is above the screen
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rect_p1_y <= clip_pixel0_y_i;
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else if(p1_y > $signed(clip_pixel1_y_i -1)) // check if pixel is below the screen
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rect_p1_y <= clip_pixel1_y_i -1'b1;
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else
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rect_p1_y <= p1_y - 1;
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end
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else
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begin
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rect_p0_x <= p0_x >= 0 ? p0_x : 1'b0;
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rect_p0_y <= p0_y >= 0 ? p0_y : 1'b0;
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rect_p1_x <= (p1_x - 1) >= 0 ? p1_x - 1 : 1'b0;
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rect_p1_y <= (p1_y - 1) >= 0 ? p1_y - 1 : 1'b0;
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end
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end
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end
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// Checks if the current line in the rect being drawn is complete
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wire raster_rect_line_done = (x_counter_o >= rect_p1_x) | (texture_enable_i && (u_o >= src_pixel1_x_i-1));
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// Checks if the current rect is completely drawn
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// TODO: ugly fix to prevent the an extra pixel being written when texturing is enabled. Ugly.
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//wire raster_rect_done = ack_i & (x_counter_o >= rect_p1_x) & ((y_counter_o >= rect_p1_y) | (texture_enable_i && (v_o >= src_pixel1_y_i-1)));
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wire raster_rect_done = (ack_i | texture_enable_i) &
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(x_counter_o >= rect_p1_x) &
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((y_counter_o >= rect_p1_y) | (texture_enable_i && (v_o >= src_pixel1_y_i-1)));
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// Special check if there are no pixels to draw at all (send ack immediately)
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wire empty_raster = (rect_p0_x > rect_p1_x) | (rect_p0_y > rect_p1_y);
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wire triangle_finished = ~interpolate_i | (ack_counter == 1'b0);
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// Manage states
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always @(posedge clk_i or posedge rst_i)
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if(rst_i)
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state <= wait_state;
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else
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case (state)
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wait_state:
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if(triangle_write_i)
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state <= triangle_state;
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else if(rect_write_i & !empty_raster) // if request for drawing a rect, go to rect drawing state
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state <= rect_state;
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else if(line_write_i)
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state <= line_state; // if request for drawing a line, go to line drawing state
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rect_state:
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if(raster_rect_done) // if we are done drawing a rect, go to wait state
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state <= wait_state;
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line_state:
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if(!raster_line_busy & !draw_line) // if we are done drawing a line, go to wait state
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state <= wait_state;
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triangle_state:
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if(triangle_ack & triangle_finished)
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state <= wait_state;
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else if(triangle_ack)
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state <= triangle_final_state;
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triangle_final_state:
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if(triangle_finished)
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state <= wait_state;
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endcase
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// If interpolation is active, only write to interp module if queue is not full.
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wire interp_ready = interpolate_i ? (ack_counter <= point_width) & ~interp_write_o : ack_i;
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wire triangle_ready = interpolate_i ? (ack_counter <= point_width-1) & ~interp_write_o : ack_i;
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// Manage outputs (mealy machine)
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always @(posedge clk_i or posedge rst_i)
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begin
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// Reset
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if(rst_i)
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begin
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ack_o <= 1'b0;
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x_counter_o <= 1'b0;
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y_counter_o <= 1'b0;
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clip_write_o <= 1'b0;
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interp_write_o <= 1'b0;
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u_o <= 1'b0;
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v_o <= 1'b0;
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//reset line regs
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draw_line <= 1'b0;
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end
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else
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begin
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case (state)
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// Wait for incoming instructions
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wait_state:
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if(rect_write_i & !empty_raster) // Start a raster rectangle operation
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begin
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ack_o <= 1'b0;
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clip_write_o <= 1'b1;
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// Generate pixel coordinates
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x_counter_o <= rect_p0_x;
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y_counter_o <= rect_p0_y;
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// Generate texture coordinates
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u_o <= (($signed(clip_pixel0_x_i) < p0_x) ? 1'b0 :
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$signed(clip_pixel0_x_i) - p0_x) + src_pixel0_x_i;
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v_o <= (($signed(clip_pixel0_y_i) < p0_y) ? 1'b0 :
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$signed(clip_pixel0_y_i) - p0_y) + src_pixel0_y_i;
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end
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else if(rect_write_i & empty_raster & !ack_o) // Start a raster rectangle operation
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ack_o <= 1'b1;
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// Start a raster line operation
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else if(line_write_i)
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begin
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draw_line <= 1'b1;
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ack_o <= 1'b0;
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end
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else
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ack_o <= 1'b0;
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// Rasterize a rectangle between p0 and p1 (rasterize = generate the pixels)
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rect_state:
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begin
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if(ack_i) // If our last coordinate was acknowledged by a fragment processor
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begin
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if(raster_rect_line_done) // iterate through width of rect
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begin
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x_counter_o <= rect_p0_x;
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y_counter_o <= y_counter_o + 1'b1;
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u_o <= ($signed(clip_pixel0_x_i) < p0_x ? 1'b0 :
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$signed(clip_pixel0_x_i) - p0_x) + $signed(src_pixel0_x_i);
|
320 |
|
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v_o <= v_o + 1'b1;
|
321 |
|
|
end
|
322 |
|
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else
|
323 |
|
|
begin
|
324 |
|
|
x_counter_o <= x_counter_o + 1'b1;
|
325 |
|
|
u_o <= u_o + 1'b1;
|
326 |
|
|
end
|
327 |
|
|
end
|
328 |
|
|
|
329 |
|
|
if(raster_rect_done) // iterate through height of rect (are we done?)
|
330 |
|
|
begin
|
331 |
|
|
clip_write_o <= 1'b0; // Only send ack when we get ack_i (see wait state)
|
332 |
|
|
ack_o <= 1'b1;
|
333 |
|
|
end
|
334 |
|
|
end
|
335 |
|
|
|
336 |
|
|
// Rasterize a line between dest_pixel0 and dest_pixel1 (rasterize = generate the pixels)
|
337 |
|
|
line_state:
|
338 |
|
|
begin
|
339 |
|
|
draw_line <= 1'b0;
|
340 |
|
|
clip_write_o <= raster_line_busy & valid_out;
|
341 |
|
|
x_counter_o <= x_major ? major_out : minor_out;
|
342 |
|
|
y_counter_o <= x_major ? minor_out : major_out;
|
343 |
|
|
ack_o <= !raster_line_busy & !draw_line;
|
344 |
|
|
end
|
345 |
|
|
|
346 |
|
|
triangle_state:
|
347 |
|
|
if(triangle_ack)
|
348 |
|
|
begin
|
349 |
|
|
interp_write_o <= 1'b0;
|
350 |
|
|
clip_write_o <= 1'b0;
|
351 |
|
|
if(triangle_finished)
|
352 |
|
|
ack_o <= 1'b1;
|
353 |
|
|
end
|
354 |
|
|
else if(~interpolate_i)
|
355 |
|
|
begin
|
356 |
|
|
x_counter_o <= triangle_x_o;
|
357 |
|
|
y_counter_o <= triangle_y_o;
|
358 |
|
|
clip_write_o <= triangle_write_o ;
|
359 |
|
|
end
|
360 |
|
|
else if(interpolate_i & interp_ready)
|
361 |
|
|
begin
|
362 |
|
|
x_counter_o <= triangle_x_o;
|
363 |
|
|
y_counter_o <= triangle_y_o;
|
364 |
|
|
// edge0, edge1 and area are set by the triangle module
|
365 |
|
|
interp_write_o <= triangle_write_o;
|
366 |
|
|
end
|
367 |
|
|
else
|
368 |
|
|
begin
|
369 |
|
|
interp_write_o <= 1'b0;
|
370 |
|
|
clip_write_o <= 1'b0;
|
371 |
|
|
end
|
372 |
|
|
|
373 |
|
|
triangle_final_state:
|
374 |
|
|
if(triangle_finished)
|
375 |
|
|
ack_o <= 1'b1;
|
376 |
|
|
|
377 |
|
|
endcase
|
378 |
|
|
end
|
379 |
|
|
end
|
380 |
|
|
|
381 |
|
|
// Request wire for line drawing module
|
382 |
|
|
assign request_next_pixel = ack_i & raster_line_busy;
|
383 |
|
|
|
384 |
|
|
// Instansiation of bresenham line drawing module
|
385 |
|
|
bresenham_line bresenham(
|
386 |
|
|
.clk_i ( clk_i ), //clock
|
387 |
|
|
.rst_i ( rst_i ), //rest
|
388 |
|
|
.pixel0_x_i ( dest_pixel0_x_i ), // left pixel x
|
389 |
|
|
.pixel0_y_i ( dest_pixel0_y_i ), // left pixel y
|
390 |
|
|
.pixel1_x_i ( dest_pixel1_x_i ), // right pixel x
|
391 |
|
|
.pixel1_y_i ( dest_pixel1_y_i ), // right pixel y
|
392 |
|
|
.draw_line_i ( draw_line ), // trigger for drawing a line
|
393 |
|
|
.read_pixel_i ( request_next_pixel ), // request next pixel
|
394 |
|
|
.busy_o ( raster_line_busy ), // is true while line is drawn
|
395 |
|
|
.x_major_o ( x_major ), // is true if x is the major axis
|
396 |
|
|
.major_o ( major_out ), // the major axis pixel coordinate
|
397 |
|
|
.minor_o ( minor_out ), // the minor axis pixel coordinate
|
398 |
|
|
.valid_o ( valid_out )
|
399 |
|
|
);
|
400 |
|
|
|
401 |
|
|
defparam bresenham.point_width = point_width;
|
402 |
|
|
defparam bresenham.subpixel_width = subpixel_width;
|
403 |
|
|
|
404 |
|
|
wire triangle_ack;
|
405 |
|
|
wire [point_width-1:0] triangle_x_o;
|
406 |
|
|
wire [point_width-1:0] triangle_y_o;
|
407 |
|
|
wire triangle_write_o;
|
408 |
|
|
|
409 |
|
|
// Triangle module instanciated
|
410 |
|
|
gfx_triangle triangle(
|
411 |
|
|
.clk_i (clk_i),
|
412 |
|
|
.rst_i (rst_i),
|
413 |
|
|
.ack_i (triangle_ready),
|
414 |
|
|
.ack_o (triangle_ack),
|
415 |
|
|
.triangle_write_i (triangle_write_i),
|
416 |
|
|
.texture_enable_i (texture_enable_i),
|
417 |
|
|
.dest_pixel0_x_i (dest_pixel0_x_i),
|
418 |
|
|
.dest_pixel0_y_i (dest_pixel0_y_i),
|
419 |
|
|
.dest_pixel1_x_i (dest_pixel1_x_i),
|
420 |
|
|
.dest_pixel1_y_i (dest_pixel1_y_i),
|
421 |
|
|
.dest_pixel2_x_i (dest_pixel2_x_i),
|
422 |
|
|
.dest_pixel2_y_i (dest_pixel2_y_i),
|
423 |
|
|
.x_counter_o (triangle_x_o),
|
424 |
|
|
.y_counter_o (triangle_y_o),
|
425 |
|
|
.triangle_edge0_o (triangle_edge0_o),
|
426 |
|
|
.triangle_edge1_o (triangle_edge1_o),
|
427 |
|
|
.triangle_area_o (triangle_area_o),
|
428 |
|
|
.write_o (triangle_write_o)
|
429 |
|
|
);
|
430 |
|
|
|
431 |
|
|
defparam triangle.point_width = point_width;
|
432 |
|
|
defparam triangle.subpixel_width = subpixel_width;
|
433 |
|
|
|
434 |
|
|
endmodule
|
435 |
|
|
|