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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# f8 ~" t' e* A, s4 k: J4 V
+ x4 p) o3 n& g4 E) V6 |, r% ABresenham画线算法 C程序如下:
' `5 S0 i0 p- d" M9 nint BresenhamLine ( int x1 , int y1 , int x2 , int y2 , int c)" j" V4 i, D$ ^3 f
* C* e! i( |: `- ?2 O{1 p# X! {+ K$ M/ y0 j. D
% F4 ]+ D7 ]5 w" \
int dx , dy ;
S O0 ~. e# _6 r7 r5 A8 }% U" E6 O! x* L2 d2 O
int tx , ty ;6 e [ N3 T2 S' ?9 I$ ^! @
7 Y$ @# t" [ X$ B* ~9 gint inc1 , inc2 ;
. w! M! N5 @% V( ^; S8 A1 Y% M& C" q& F* V* ?, q+ j1 a
int d , iTag ;+ F/ b# F2 g# K3 e p+ Z
! [6 B5 G9 Y: p$ c, O
int x , y ;# i: a9 \4 U+ g/ Y0 K
4 ~' i9 u7 ^7 A( E$ v5 D
putpixel ( x1 , y1 , c ) ;
- S% A/ p; G2 B
, ]* A1 l8 n- W1 R. K$ k- Iif ( x1 == x2 && y1 == y2 )
% l2 X& ~# f2 T, y M+ d return 1 ;1 k- ~% f5 A' V$ h& q
, A+ B& C1 J$ E4 _* F5 g
iTag = 0 ;
$ O' ~+ C) Q$ Q% l6 e3 a# [( L0 k1 B4 c4 S. X" v
dx = abs ( x2 - x1 );9 r; a$ ?, a% @2 [% Y# B
/ j# V/ q$ ^$ M5 }1 u7 ldy = abs ( y2 - y1 );
: T4 [9 u; X$ u8 d+ P& _3 F
' g+ Z/ A( h) D; B8 i# Q" Qif ( dx < dy )
' h+ Q6 p' P+ }# K, ~( ?! q0 ^* W0 k! r# R% i* U
{
; L7 [3 y/ N* c7 k! g( { p* D
* J, b' C& s, i2 W2 ~: Q8 I iTag = 1 ;
' F4 [- ]: w! l- T- ?
% O0 x1 m$ l' B4 [. Q Swap ( & x1 , & y1 );! M9 M6 a$ j7 Z4 ~ N. z+ B
# ~& a1 w. m S( [ Swap ( & x2 , & y2 );
$ _/ T1 K5 _" O: Y" a- m& r2 J% g) d; \% ^/ r2 ~8 o: s
Swap ( & dx , & dy );) P" o; V' T8 V% O# `
7 Z. p* E, S$ m1 o1 w6 \}
1 w! O& M) H2 C! M N. {
8 X+ M9 p, H7 O$ Rtx = ( x2 - x1 ) > 0 ? 1 : -1 ;
) r( c, L, H. j- G3 _) ^2 Cty = ( y2 - y1 ) > 0 ? 1 : -1 ;4 g" ]" M$ c$ s: u! F( K
; Y( u& f& z8 f9 J& lx = x1 ;- L! u2 i' j+ B6 N: z
4 z( F4 l% m; ?( X0 Q
y = y1 ;
" K& m9 l, x0 k h e* \9 Z) n4 Y/ |% o" C( s$ F" t
inc1 = 2 * dy ;
2 k$ m* z% _# H, H& l$ D* i# P* e7 \: L& N
inc2 = 2 * ( dy - dx ); R9 U1 S- W( l% k
2 J, Q3 M. W: f2 a3 u, ]5 V) e' W
d = inc1 - dx ;
- U1 D3 c, v% x" G* m2 s' i" [4 ?( D) k/ n7 L# p3 z! r" q* [1 F( {
while ( x != x2 )
* x& c1 r" E9 r$ U: {& T
! z0 H0 Z }; R) U{
! }- d+ g3 I& i" L( @" T, n
7 f* l3 p5 ]" _: k$ K if ( d < 0 ); k8 L5 j& R P6 {. n
0 ~+ O# m( \' V* y8 o- j. N3 I! G
d += inc1 ;
+ f' Q% L/ G% N( g
" }5 p; l, ^' \& Y# I, q0 Q% T else
6 p4 J5 i4 X. l/ J, \9 t* t t
( \7 R( Z8 Y8 Z, p0 F {
0 I+ _" f0 v C' J
( V/ T( x r' G2 ` y += ty ;( }5 ?7 J% I; n+ i
0 T+ N3 W0 T" P8 t d += inc2 ;
1 P! q: X% \- H: w, U; C; E) G7 v! V
}
( u. x1 o# a2 h+ L: }
1 B6 o# k; [! d if ( iTag )
# e( x' n7 h6 g! u5 E' Q3 z2 I5 z4 x: f5 @% g
putpixel ( y , x , c ) ;
- d$ g7 q+ ~1 Q! j) O
X0 j0 M- O0 C1 I7 O* b5 | else
- w" V, F( x2 o7 K; \5 i
. U/ I7 s) R4 g' I' _ B/ U3 a putpixel ( x , y , c ) ;/ P4 }& e) K; t$ c a- e2 d
% g" c: O4 U$ k$ j* h. w
x += tx ;5 l8 |1 X4 V- k' G3 Y* m
$ m% G. R4 R/ r, z- W
}8 s3 D: ?% j. b9 Y2 \0 F7 }
8 V$ q" j: S2 ]+ e! ]# Qreturn 0;
w& K0 }' c( S( g
3 H7 s6 G# Z* r}: L: ?- Z4 ~+ [1 o/ j9 M* L
$ Z0 G' u& B; L7 q8 q
Swap ( int * a , int * b )5 s* [# M1 H1 h" e# \0 A
{
' S/ p* r4 T6 N9 }! d& X4 ^6 ?5 @0 _) N5 y2 j9 v
int tmp ;
: t8 h w; x4 C, o. A
; g/ M; z7 f; F* L5 k1 j) J* ttmp = * a ;( p2 F" [9 o, N+ J: z2 f
4 `! j! i$ c }8 _; f7 o' Y6 r$ n/ v8 x* a = * b ;
4 C' y! p8 h8 v6 I8 q+ E
( F; G! ]& d2 I% H$ W+ [* b = tmp ;) ] O- T% u" S8 v, q
3 l* I2 B: i! |4 r3 T. o
) a, _# T1 _) D# C3 c" w+ Y# `4 n2 m3 x
}! P7 `* k7 z2 j) }6 r; p
s* O# u; w& S) a
) H& ~ x2 I5 B2 j1 ~
Y. Q N3 f) p" H9 Z- d2 ^: w, O3 {9 l5 t& ^
FPGA实现如下verilog HDL :0 G% ^+ {: D& D% N" ~4 n# P1 ]: b3 z
module line' @' i, B7 _6 E1 Y, w# f+ N
(
6 n: x6 P B( x& l, E input[31 :0] page_address,% W. F3 Y8 x# T! f/ h
G% Y8 D; |& v" qinput clk_i," }7 k& o' T- @ Q* E% {. C7 z
input rstn_i,9 ^$ N! y- ~* b% E; \4 A
input load_i,. r1 ~! E5 T3 J7 }1 |( Z
+ ] v6 n' z; E! Y3 L* v9 A" g
input ack_i,- X- ~& p0 v2 p5 [9 A0 x
input signed [15:0] sx,
- ^7 M7 N0 a- C" ~( F3 G% minput signed [15:0] sy,
# W4 L9 v7 f+ }- Zinput signed [15:0] ex,
# z. x0 K* M+ q% U5 X7 Jinput signed [15:0] ey,
! U- k' ^# y* Sinput[23:0] f_color_i,
8 D4 t ]) ]% W; E input[23:0] b_color_i,
- R, I* y, ?" Ninput[7 :0] data_i,
; S0 b9 H# F, }0 }& y8 D' W : v5 Z! u% N. ~ K0 q7 E
( W3 M' D' f/ @! _; ~
output[23 :0] data_o,
: n t" \! a! A( \ \ ^ M, d output[23 :0] addr_o,% X0 U6 j, J. h+ ^- J3 O- C
output pset_start_o,, a- A+ Y, q2 B$ x* v
output reg line_over_o
% A/ f- V+ v/ x: v+ o& `5 s1 }2 w);" i; G* V! x) D; y, J
reg[23: 0] addr;, n6 {3 M. v$ W% k# ~8 g
reg[7 :0] rdata_i;& B+ t8 G2 i' o; `( i9 z
reg signed [15:0] x;
1 D) K, V$ c7 S o1 Breg signed [15:0] y;6 o- x0 g5 x' G! D% V2 g) }
reg signed [15 :0] xsign;
# B0 i1 k$ ]% D H3 } O# greg signed [15 :0] ysign;
6 J) ?) X5 u* f8 B$ D, _! Q `' g$ k6 k
reg signed [16 :0] delta_x;3 \! L* v" j5 F% G# h* o, | [
reg signed [16 :0] delta_y;7 G: d5 u3 R1 S# y% t
reg [16 :0] rdelta_x;
) C; g! m! u# freg [16 :0] rdelta_y;
" ?" Q; P4 K1 g [# H. V1 u: K8 Yreg signed [16 :0] i;# s: e+ U* |# U# o X/ @) I
reg signed [16 :0] e;6 O$ {6 a0 C8 h! x: b
reg change;5 x9 \3 O- t+ j6 \% N; Y
reg [3:0]state;
" z. G) o5 Y: E! M& }9 E0 Jreg pset_load;
# m0 v+ m2 X0 L! ^) r6 nwire over_o;
: D) m# u6 y) Z) A6 s
9 u5 ?4 S8 c6 T) b/ B# E1 C// Declare states" u) n5 X% D9 P( a0 r
parameter S0 = 0, S1 = 1, S2 = 2, S3 = 3,S4 = 4, S5 = 5,S6 =6, S7=7,S40 = 8;; D0 I- B! g4 a# V- n
// Determine the next state synchronously, based on the
t5 h7 s, @2 B! C" Z$ Y" O// current state and the input
[) u/ J& c4 C. ?5 G1 jalways @ (posedge clk_i or negedge rstn_i) begin6 U8 w$ P7 D8 f* r
if (! rstn_i)
* B+ Z" U+ S1 W% W4 c6 A# Y* f4 E/ _7 d begin$ i3 [" s: P) N" n9 a1 ?
line_over_o <= 1'b0;
9 b3 ?3 G* g; X2 b; Z9 H$ a L$ M0 r rdata_i <= 8'd0;
9 x( W9 B } `) ^# \# q- w @3 p. f
addr <= 24'd0;
8 a% ?7 h) N$ T5 B xsign <= 16'd0;# x8 P. P1 j1 m, n8 d/ w
ysign <= 16'd0;
2 K. }" k9 Y. C4 Q/ d E delta_x <= 17'd0;# v* [2 y# f8 h( c
delta_y <= 17'd0;$ ^ a8 I6 W: b" n n! r, r2 G! L
i <= 17'd0;& |0 ^1 ?% D0 a) S$ T i
e <= 17'd0;
& A5 H+ Z1 K; |$ ~( m# [4 @2 ]
( s- k& H8 K" u6 v9 j" a
/ g' h* j M$ F. T: J3 B1 K pset_load <= 1'b0;
; g* s8 S$ I. e4 g+ \1 g state <= S0;' ?, H2 a. r8 K
end$ j* N& T; o3 U( b
( q7 c" a$ m4 \& C: o5 ]7 q3 B9 ^
else5 I! _$ G6 Y" S% r6 ~# |; A! f% {' s' C
case (state)
* b" t& c) g% b6 k, i4 N S0:3 z- p- a+ Y' g
if(load_i)1 I: C4 c J% H
begin2 F( {6 j7 b8 {5 X2 D1 N* d
line_over_o <= 1'b1;
4 b" r( l- k8 E- W0 O f2 g5 S1 _$ ? 1 d: v6 ]0 x. u# J& ` f$ }4 d
0 o, ?* \1 N5 [1 _1 [" b- Z7 u
x <= sx;
1 H" N7 {7 |: h8 z c/ a y <= sy;' ]$ \ ]# N0 |5 [8 X+ O
delta_x <= ex - sx;4 f3 n( d, t! f& Y4 w9 G; h9 R
delta_y <= ey - sy;
; I g! g& f- ~1 K( M; W state <= S1;
/ |" h/ D. T0 r6 W$ U, h end+ Q0 K: |7 R0 P3 \
else
# B. Y# w; I( U( B/ t { begin( L# ~) j& Q8 A
line_over_o <= 1'b0;
9 p+ q; T! Z9 N# G/ V state <= S0;
) I0 l2 M. w0 ?' K* _5 V' N end
, R7 I6 s8 t7 E' V5 V$ V; M0 `% G. [/ W7 i6 k
S1:
1 G& ?* y" F+ F begin; d5 y' q/ D' j) T/ p9 @
$ U) I5 }8 e& U) i1 c' C$ Q if(delta_x < 0 ) begin rdelta_x <= (~ delta_x )+ 1'b1; xsign<= -1; end
1 [" G- f1 v4 g4 `& I else begin rdelta_x <= delta_x ; xsign <= 1; end
3 p- H, x& d5 I! o4 P
& ?' y" t. |9 c& M& ~; K$ F9 R( V% P8 s if(delta_y < 0 ) begin rdelta_y <= (~ delta_y )+ 1'b1; ysign <= -1; end% ?; G' c1 q4 h6 H! q
else begin rdelta_y <= delta_y ; ysign <= 1; end: i8 \ Z, N( R" [: y$ k
9 K$ X- R2 C4 A) ^: |. J, x: v$ r+ `6 N+ o& A/ j
/ @' S( d& E0 ~" x0 J state <= S2;# G; V% ]4 u$ u/ b
& w$ j7 R3 X4 r. R. Z
9 a, v" m3 B' I% b7 N1 a2 T end
/ r3 i6 C; n. l0 ~% Z: U4 ~2 } S2:
/ c8 A- z& y+ |$ I" p7 m, n8 U) p begin. p l) m* ^& L* M8 M
if(rdelta_x < rdelta_y)
. \ t7 ^1 Y# R) E, Z- C begin" f, ^: K. K1 V5 v2 B M
delta_x <= rdelta_y;
* |4 p0 U7 k7 c; m; I delta_y <= rdelta_x;5 Q2 M$ k% @$ Q+ p. Q5 z
3 P: X' j) w! o8 A
change <= 1'b1;1 m6 j2 p2 ]2 W$ l- S) ?" P
end
; z% T8 y# Y e( L0 }# } else
: A) s0 x d! } begin6 D% ?/ U, B& g! C+ k5 _$ |
delta_x <= rdelta_x;
6 g& |6 c1 y, f4 I2 u delta_y <= rdelta_y; 5 F- n: c' F( ^+ g0 v) ?
change <= 1'b0;% ] \. {) e) f
end 0 {1 N, _$ u e! Y4 I: D# n
state <= S3;( e* H5 G" B4 R/ {* v
end- n) G* U) g e5 P3 h
S3:$ o- y; G" y q( T3 ?7 [5 N- U$ b
begin }5 `% f3 f$ t9 `0 V5 w
e <= ( delta_y * 2 ) - delta_x;
3 v0 J8 Z$ Z- |2 U2 c i <= 17'd1;$ Q4 ]+ d% K& |( p; s7 k
rdata_i <= data_i;7 _3 x$ y1 x- U2 p+ O
state <= S4;
* l* R- W0 M* k; |( r5 A/ ^ end
& I# c2 z0 f) H! |! }: u S4:
2 H7 G/ N: |# G3 Y8 J) E+ m' e begin" [# V0 ]$ @1 I/ L( Z
addr <=( ( y * 1024 ) + x ) + page_address[23 :0];
& |4 o: z& P' p4 V pset_load <= 1'b1;' w8 o: W" w8 j
state <= S40;1 O# z* S+ X) R0 ~0 ~' b; o
end2 T1 D0 n# J* f! O
S40:
! h B) n9 W T$ E6 n' g1 a# c8 x begin
0 y. k9 m: e4 Y+ d( ? if(over_o == 1'b1 ) p# g7 L r' M9 O" w G
begin
: O6 V" }) L p9 x( }) ? pset_load <= 1'b0;2 w. y! E. S9 x% F" q+ e
state <= S5;
& H: i4 m) d. h* O" z1 M4 t) \ end
( _* Z4 M) f4 W7 [/ I4 b" j1 A! h3 y- l9 r2 Q* G
else
6 q; j# Q6 v6 ^/ G! j' |" n6 J$ R+ m( n7 e9 c. A+ O8 \) r& h: `
state <= S40;
$ x7 f% ~5 d+ S
6 e; ~, u }5 U% ?" Z, T" ? end
0 \" o4 s4 S& f S5:" r9 V' S& H4 [ p
begin
3 C. |+ v3 c* b9 x: a6 n if( e >= 0 )5 c1 x5 d$ M. g0 j, q& B
begin0 e4 }% W5 S8 `* ?* N7 }
if(change == 1'b1) x <= x + xsign;
6 X* b. n; J% X, ?% V$ V; l! W. m else y <= y + ysign;: m9 e7 F. @$ l. C7 E) R# m. [2 N3 k
e <= e + ( delta_x * 2);
4 N* u4 z1 T2 W9 P state <= S5;/ S, k* J$ Z ?: A. r# z
end , @( ]$ D! K; @# t& N9 y* W% z
else1 {2 s: f. y4 i. Y: M* }: g
& q5 E" T3 q1 z% {) k
state <= S6;
1 R* J* F5 _0 H5 G0 I) J8 u end6 @9 T) H: L( e6 n! |2 C! K
5 H& M6 B. j" o3 o4 K& c4 C0 u. s; a2 o. X9 d" m
S6:" [& j5 r3 ~3 I$ U, U
begin4 \5 k v% K- |. {2 O4 _* Z) m$ w
if( change == 1'b1) y <= y + ysign;6 H$ j$ }" h6 q7 Y! |
else x <= x + xsign;
: ]: J& ~; Q& Z m e <= e + ( delta_y * 2);% \3 N' [( v; I5 `! o* t
state <= S7;3 L1 h, V; L7 h+ u" v
end" }6 N4 k! s0 }! j: o% p
9 z5 Z3 m& u g) D& C" s* k* ^; R& Z( l, `) }! I
S7:
. Z! h3 }: T( \ l& X2 M begin
+ Z5 ?/ _! k t) D9 N if(i < delta_x )
! @! \. \) N$ a5 P/ j4 C begin
9 C! Y" h2 B- C" ~$ R i <= i + 1'b1;7 b$ ?' M [7 [0 h
state <= S4;
6 R8 g% z; c/ b end
+ i) d( s' T. }2 I! |* B. y3 R5 F: \8 J1 K
else
: N ]5 d% D# Z8 R- @# x7 G/ j/ ?/ J
# i4 b! p- D+ p3 |! }$ u4 S begin
! p2 I T. T4 G0 M5 B s2 Q line_over_o <= 1'b0;
7 l- U& j. l0 f state <= S0;
! @* f* Q9 x+ v7 e end f( p/ \5 m0 l; `4 F$ w3 \
end
S; u( u0 W8 Z8 c* h. s6 p
+ }* P& `6 T9 z9 u( [9 E% G W! @, t1 F: J( K: j# l
endcase2 C/ c/ B" U4 p/ W$ z/ y4 m
end
1 P5 N- Q" @/ e. s3 \( r( Q/ X" A6 C8 I0 W! p' \
endmodule |
|