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发表于 2012-4-1 12:48
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下面是Bresenham画线算法 分别用C语言和verilog 分别实现,这是我做的LCD控制器里硬件加速的一个模块,其它如画圆,字符,填充等可以以此类推8 a9 m& `( R: Z3 e
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Bresenham画线算法 C程序如下:
1 d* O, z3 Z2 f9 eint BresenhamLine ( int x1 , int y1 , int x2 , int y2 , int c)& K0 D1 m6 Q1 j% l4 z
4 J. Q1 E5 [- M0 Q' h. ]
{" l7 k8 r, D& }) j/ O1 q. j( g+ w% ]
/ L1 \, _; y0 D0 q! k: K. e; c& ~int dx , dy ;, @) ?: v, j% g3 I8 W/ o2 x; [0 P' o
3 p: b# u5 u+ u2 _0 rint tx , ty ;% h; d$ N# H' r I" ?* A7 w" S1 W
' H, ~# G- n M$ s3 v+ O. l: e
int inc1 , inc2 ;
- o4 S+ `5 m! T8 A6 B8 T
$ n0 I* K' q; L* ?! pint d , iTag ;8 g3 q5 e. Z4 g- u4 F0 a
# o8 X% g/ L, Zint x , y ;
2 x- z+ D5 h0 ?' _: v
) H' f3 P/ K6 Y# N9 |! lputpixel ( x1 , y1 , c ) ;
9 e c3 K7 D5 P% s1 r* p/ S5 }9 U/ f
if ( x1 == x2 && y1 == y2 )
# x3 I9 Q% n; a" ~+ G( P @ return 1 ;
5 [0 U2 u6 \& c) P. h
( Y9 Q% ^2 [; E: K6 @4 viTag = 0 ;- U6 I( m& G$ _; I
# [3 t3 ]" C9 [7 f m- ydx = abs ( x2 - x1 );. [5 ?, ~4 C1 |
7 X7 j2 b( ^! g% ^
dy = abs ( y2 - y1 );, P/ {) Y X5 Z( g% F- q% E1 k3 o
1 J m: _2 b( sif ( dx < dy ): ?+ Q* u8 G0 k7 f/ y
7 e5 H' \6 i. X5 \! n8 j7 s R
{
! R0 {4 L/ _# h+ d* r: @, F8 X7 p
+ c! T( N' _* S' l! Z5 y* I iTag = 1 ;3 `& H) }, C& N# y3 ]
& H: |/ B( D' J s s: L
Swap ( & x1 , & y1 );
; K1 }. X9 `! @# U( k
0 j/ N* |' M3 L2 g; e Z" X' M Swap ( & x2 , & y2 ); P9 |. q$ {- ^9 o# Y- x
* w) g1 [% s5 b+ p+ U+ D3 Z
Swap ( & dx , & dy );5 U. D) e; c9 V8 C$ |9 `: S. K
" d' k' L1 i1 O}7 Q$ w3 x4 C& l! ~# G9 I
2 H2 @8 a9 a6 t5 i6 I7 k
tx = ( x2 - x1 ) > 0 ? 1 : -1 ;
z+ z2 N6 Z. v: v9 T: Tty = ( y2 - y1 ) > 0 ? 1 : -1 ;% W& m* g% }4 E2 Y1 [; }/ A- K# i
9 ]7 ~3 \, l; `; s1 tx = x1 ;# I8 M7 @: q( E! ~
- y3 p. F$ k5 Iy = y1 ;
1 g( B2 C: @. ?# }9 W* q [: F1 u
1 s' T5 t3 z2 j, q9 N1 w8 ninc1 = 2 * dy ;: k5 J0 i0 K( e, l1 v7 d6 u
" W5 p2 Z; [& V+ R, V( ~* s8 k0 g8 Iinc2 = 2 * ( dy - dx );& B6 k2 h- _) i1 j% l
' P! m, q9 ?" z6 cd = inc1 - dx ;. P' s7 n4 o r( h: Q/ z. d9 K
4 `% k U% N" U+ Z4 _8 |2 C+ Ywhile ( x != x2 )
9 G! D X! E8 R4 g9 h0 Q" g! Z& |. d o
% g. ^' A1 @& O- D% v{
, w4 b7 ]; c/ c# I$ B; F' c; c$ L9 K+ I$ w- X
if ( d < 0 )' J7 R7 ~; a5 s" { q% b
0 @8 D: p, h6 {" |. |# V8 E, c" ~
d += inc1 ;6 d' h# S1 Q o& K
' y# T I! t4 S, w: e! k. E
else2 q' P$ N3 i$ B- v8 M5 `
+ z. m9 D2 T; @ f- W9 H {* T% [6 C9 _0 }: z. q6 g; U4 ]6 _
; k2 F1 ^+ v6 x, ` y += ty ;
) Q1 ?) F* y/ Q; @% R
1 S( t6 G1 U" `7 ?/ a d += inc2 ;2 s9 ?% h5 s5 L1 ]* E% n! C
8 [3 d" w, X1 i/ s: ^! n }4 ]- c1 R3 ~) m, C( z5 G; _; n
. e: d2 R$ w9 q. j6 S% t if ( iTag )
$ S, |, `4 r5 m5 W9 f; | @8 {% N
putpixel ( y , x , c ) ;
. A( H; K6 _0 s' ?% F$ c' n
9 e; p+ T. g, J' Y- f3 B& i else9 [# m# @, [4 c! ~8 H
7 E( O+ W6 f4 i* \/ U- ^
putpixel ( x , y , c ) ;* b% ]* E a5 v1 I. g
- g) P( e6 v2 A; q. v8 v. ] x += tx ;6 M2 I: i# x4 u# |" {3 w
6 B) _4 |' c: I* G}* A$ D3 A! R# i/ q9 ~: a1 P
' m* x& H3 @( \9 i9 I+ l/ Q
return 0;
+ Q! M- W4 `, W9 q4 z5 I- a. X# } n. @" T& x7 f: [/ W* h! e
}- V" l5 }! F; }6 s
$ F5 m- \1 b$ C' R8 p
Swap ( int * a , int * b )
" P: b" X+ @7 V) b5 a6 R5 k X{) k- p0 ?, D3 w# d! ?. z
8 b# j% F- J# e* jint tmp ;
& W* s, O0 |5 l& d
) W6 M; O3 M0 y& v z9 Xtmp = * a ;
$ t6 V2 t" D5 R* i: U5 b1 I
& ~. T% w- _- B8 T( `8 j& { M* a = * b ;& ~' G# D/ B3 h/ p6 d
0 n4 R+ \6 M1 s5 ^ \2 U* b = tmp ;
/ k& g+ y W: a0 V5 |" _" _! R& q1 W# A: w" s$ s; D
' i( g+ q+ n* ^
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}8 v! F$ Z* g6 q, P2 Z \1 o
- a! H. j" W! e1 c0 n; O
0 _8 Z! F" H% L/ ], u
, `' Y( ]/ [% X) a5 i$ N) H& G. ?0 C) {" _2 A- m/ ?! g
FPGA实现如下verilog HDL :) p9 X2 A$ ?7 d
module line
4 k8 r0 o( p- \* M$ D. L& e9 r(
- t' ]: |* d; \ input[31 :0] page_address,
# j/ Z7 i6 N, h6 }9 U* N5 H5 G; l5 z( r) r6 A2 ^% A
input clk_i,
, k# D. |. \ j' z- ~/ ninput rstn_i,( k8 f. ^6 U) ~# \7 m; r( M
input load_i,1 G( i! V; v! m! z; T& X
& }/ R2 x- O, `! R( v2 n( i) s& n4 R* E input ack_i,0 _% I; @* U! D1 j# \
input signed [15:0] sx,# H" K" _1 S( N3 s. H; Z
input signed [15:0] sy,
, |9 Y- x( E: h$ @) rinput signed [15:0] ex, d# C+ _2 N+ m9 Q
input signed [15:0] ey,
& C0 J% _" y) I$ F; P) H+ K0 ~( Rinput[23:0] f_color_i,
" K. D& v- ~: D7 g$ w* V+ T. X input[23:0] b_color_i,
( ~! d, c2 X; T" a; q9 o4 g; q. `6 _input[7 :0] data_i,+ s4 H' m; Z8 R2 F& d3 `
6 z0 k H- f+ q V
" I/ _- s8 p9 B* j5 h' a output[23 :0] data_o,
6 V! j9 \, o' {* l output[23 :0] addr_o,
1 @, D/ Q* [; l8 X3 x/ j output pset_start_o,0 B9 B. H# }8 U* R1 W& P$ g& n+ }
output reg line_over_o
7 L- U# ]/ }( l);. d, T% J! {+ s6 o* \
reg[23: 0] addr;
9 h8 D! s2 X( s. V. y1 Z! e' lreg[7 :0] rdata_i;
5 F7 A8 `) r+ O" c) Jreg signed [15:0] x;, V3 _+ G& A8 x2 Z, s2 l# x
reg signed [15:0] y;
; Q7 ?2 B/ u) Nreg signed [15 :0] xsign;$ X9 X) Q; `9 F; f: b9 D6 m
reg signed [15 :0] ysign;2 O* H2 m& w9 S3 }8 s
: e9 J. x3 o, ^1 V$ t
reg signed [16 :0] delta_x;% o* T# c* p4 v
reg signed [16 :0] delta_y;
3 J) v$ y9 j$ ~! ?/ f) {reg [16 :0] rdelta_x;
! [8 d. V) m8 R6 e7 @, K6 z! r9 breg [16 :0] rdelta_y;0 _* {, W9 q4 a& ^2 [- X2 L7 o0 {
reg signed [16 :0] i;
5 f: v7 x+ Z( t8 [( l- f$ E1 D5 Dreg signed [16 :0] e;
0 A/ N0 s: i7 L- Q" nreg change;3 z2 ]+ r( k; Q7 i8 n+ I9 R6 t
reg [3:0]state;
, q& w+ @, E+ ?- `reg pset_load;& `% w& K. h/ N( S
wire over_o;
' M# h0 `" w+ \$ I. W+ h/ I2 C
( e& f1 d7 P9 E3 f( G/ i// Declare states; j1 s- Q& V. {
parameter S0 = 0, S1 = 1, S2 = 2, S3 = 3,S4 = 4, S5 = 5,S6 =6, S7=7,S40 = 8;: @ Y' r5 b1 A6 C) r+ o
// Determine the next state synchronously, based on the
( G# ?5 O8 n$ B2 c2 U7 }* F// current state and the input3 K9 z- T9 \6 ?7 A! }
always @ (posedge clk_i or negedge rstn_i) begin" N" ~0 l, q9 z1 b2 M
if (! rstn_i)( R* W/ x Z0 |3 n. ~! K
begin
' o# R' q: o. w3 y line_over_o <= 1'b0;
0 n( Q6 h0 a- |4 ]3 g2 ~ rdata_i <= 8'd0;
$ ]" [" b& E4 x; ^% z2 Y) n2 w8 y2 O0 Y! F% {
addr <= 24'd0;, W2 T( b7 H! S, l
xsign <= 16'd0;( h& _3 }: T+ r7 y( T( M0 V
ysign <= 16'd0;
+ C. O, T9 Q( ^. s( q delta_x <= 17'd0;" Z) e- d( z& T7 R+ V _% e6 t' z
delta_y <= 17'd0;
, \( @4 z! \0 s8 v i <= 17'd0;$ B: e x4 H) i
e <= 17'd0;. q- K: v) ]3 }3 I( t6 H: w
0 K7 d' |- l9 Y4 f9 E
, v" q+ q4 _3 Z# W0 m
pset_load <= 1'b0;
( I0 x9 ]( a T state <= S0;
; e# l- r+ r( x0 o end. P( k/ x+ _) t' w F, _6 E( [
& ~4 z( k$ @: j3 e
else1 z& G# r$ w( K! f) b
case (state), ~$ ~$ g) z* Q- g& s
S0:* x% K* ]0 o* K' P+ J) \
if(load_i). g( c6 v* c6 L3 b4 ~/ i' p
begin$ s1 ]+ T9 [0 t8 M v7 F' X) ]2 t
line_over_o <= 1'b1;( C( R+ a0 M3 p3 c
- f/ u8 ]$ ~+ j N" O! i
; y0 z) ^. h+ c0 M& R8 Q% r5 I x <= sx;
6 z# y6 @6 W: W4 N+ j' n y <= sy;9 G# I, }3 h9 P
delta_x <= ex - sx;8 B w1 G. [ o9 e& Q S( Q5 o7 ?/ W
delta_y <= ey - sy;
K% e* W% B8 d state <= S1;3 R8 H. w: Q! L
end
4 S4 A6 }5 f0 d% @* W4 E else S, w! i: f3 n! b: Q3 s
begin% y$ @3 Q; Y7 @
line_over_o <= 1'b0;4 _; @7 g1 n: Q( V
state <= S0;3 u# H; S- }+ z/ I
end
0 [' L! d3 }7 I9 e, G* R1 H2 k2 j* Q" j* i
S1:
8 |: _. {6 {! P# s* W begin0 L8 }( G6 I" I0 D+ C+ b4 m# d! ]) B/ H
. I7 p) o% i% w if(delta_x < 0 ) begin rdelta_x <= (~ delta_x )+ 1'b1; xsign<= -1; end" ?, N3 `5 m# T
else begin rdelta_x <= delta_x ; xsign <= 1; end
1 f5 Y1 |7 _1 \! \
; H. f: [; }5 A# e+ b( f if(delta_y < 0 ) begin rdelta_y <= (~ delta_y )+ 1'b1; ysign <= -1; end: S" @( z$ ^0 x( }8 b2 g
else begin rdelta_y <= delta_y ; ysign <= 1; end
4 g) h* \$ `2 D- U& G
. d& G6 @1 E Q. V6 z8 N7 s( O- w U3 U6 i
. i4 L; R0 K; q; u7 s state <= S2;
S6 L& O, [7 p- q5 u5 C# J5 \) O+ w/ f, G5 F+ h
3 ?7 f; F+ h7 e% K
end
9 d, F7 |1 o8 S6 S# A( Z* [ S2:2 L2 b1 L9 @6 Z+ ~. }! T' z
begin* V6 N; P7 ]/ A1 t# Z
if(rdelta_x < rdelta_y)6 F* P3 {: V f7 T0 G1 n. F
begin( t' e" e9 T; W, R( M/ e/ x
delta_x <= rdelta_y;0 b. m7 c) h# h6 @4 i. l+ |
delta_y <= rdelta_x;. j) g2 Q: @: w/ ^
. V1 ^0 D& ?* s7 t! B) k3 I4 ~
change <= 1'b1;, X0 H; |4 |5 j, M5 w8 r
end
6 o9 ^% m+ u0 y% U# Z else" y D/ {) R2 O. n/ z# u, \( e
begin
' O2 A8 k; }3 }9 k2 S7 P7 ?2 H delta_x <= rdelta_x;! k9 w6 N: H* `# P# ]
delta_y <= rdelta_y;
) X$ a/ D6 f, u6 u change <= 1'b0;/ D0 m; q9 g" f" |- B, ]
end * c; n% u. ~$ Q3 k; g7 q( [
state <= S3;) R2 M1 k* q4 l0 H, M5 x
end
D) k, i U) Q S3:
) [, x. ~! V$ Z( V2 W begin& R Y5 j/ l, o$ \) s; F% B/ I: _
e <= ( delta_y * 2 ) - delta_x;$ `( U. z9 R# L, t2 ?
i <= 17'd1;
" {3 B: ~* O/ q! N. O4 r rdata_i <= data_i;3 u* n( H9 H# r6 o
state <= S4;
$ P8 w2 U& l- a$ U0 z9 P( i end$ d: [( v9 H2 P# e
S4:
2 R) \$ d/ E1 \% N0 a7 N2 } begin8 q2 C4 R, i# f+ L! C
addr <=( ( y * 1024 ) + x ) + page_address[23 :0];, k8 s/ Y! Z9 ^- Q8 {
pset_load <= 1'b1;5 Z0 g6 k+ I6 z/ G% t- Q
state <= S40;: a. P v! L9 w8 q* x
end5 D. w n" R% p0 S/ I3 A5 O1 ~& `9 Q
S40:
+ @) U. Z/ o2 u6 g$ ]3 j begin+ F7 D: X0 V: ^" y' S; d' B8 h* q
if(over_o == 1'b1 )4 T) t2 |* a! o
begin9 ?. g: W9 S e% M' i
pset_load <= 1'b0;
" u8 ~% s/ H- `1 P1 W state <= S5;
) n# U/ A1 `; Z6 n0 i& r0 H end
+ X9 |! Z$ s M) `9 O1 l! u- B8 v; l6 |/ M5 z
else2 J& t/ Q7 d, r" ]0 N& p
! I' o* ~8 K! S1 p state <= S40;
) {7 }4 N h! O6 e- U) l& m. S/ Y$ n5 N7 t$ w/ C- _/ t: I
end
: G) T2 K- [& ^: Q8 \ S5:
" B. F( N4 c+ a) P" U8 H' m5 @ begin' u b1 v5 L3 ?
if( e >= 0 )
! h7 c6 V% u2 T" ?$ A begin1 s3 f/ Y% b; t5 {
if(change == 1'b1) x <= x + xsign;* {8 ]5 P% w( m# ?% O, E) M6 r
else y <= y + ysign;
/ y: G& y P% q; C9 Y e <= e + ( delta_x * 2);
3 B& Z0 R$ T$ r state <= S5;! _* F( I' L- Z* B2 O0 l# C
end
0 G1 y9 ~( @$ ~ else
1 y0 D. @/ X% Z: b0 W6 b; k V0 U0 s. E S( E
state <= S6;
1 M" K3 ?( y3 T+ I+ |. x4 I end
8 {: `8 `& b$ a1 L. J6 p# D' P: [ b% n2 k- w
- L# ^" G) g; [8 C S6:! @6 r8 y; L' _ o# r; p: o2 m/ j, i$ A1 O$ l
begin' o% b' C9 Z* J" G7 @
if( change == 1'b1) y <= y + ysign;3 X, U: e% N) ~4 a
else x <= x + xsign;4 g- Y" a5 J3 \, R, ~
e <= e + ( delta_y * 2);. L6 I/ G$ i. d# D. p( q
state <= S7;
& J5 a- U. U7 l+ m) q end
1 }! o& A8 r3 s: j
; p. H( `9 H, t& ~6 D/ k' }% z a$ @* ]% E5 r' D9 \6 }
S7:: M: _2 `* u0 L( Q3 E1 H" E
begin
( g$ [2 T* S: _4 K5 a' p3 t if(i < delta_x )" ~3 F: \3 ?7 F6 z9 Y1 v
begin% ]) v; X) }" }$ D% l
i <= i + 1'b1;
* ~5 r+ M6 F3 K* |$ q) A* N state <= S4;
& W* t! `* m1 H- J end7 \( N2 [" z6 G0 ~( Y9 E7 i
9 `5 p! y9 W0 F# }/ K) X$ t" l
else `; G- i# R8 i ^3 V6 Y
+ v% W& g* ]5 f# L; Z
begin# q9 A8 D( [/ M0 j3 D7 M
line_over_o <= 1'b0;/ c( l# F, N; n' @
state <= S0;, ^' O {& T+ A9 z# X
end# w* J" j7 }9 ]- l: D
end) R2 X# ]$ o1 Z) Q. }5 ]
$ o5 q' S2 g- {
: F$ f% S$ A" d2 n
endcase
" f8 H( Q4 ~: `* H; H: ^- t) P, q; Pend
0 Z$ L/ K, K0 F% i% C" T7 l5 e5 _. A
endmodule |
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