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|
;
; cube.s : representation en 3d d un cube en rotation autour de son centre de symetrie
; a linker avec: trig.s, drawline.s
;
;
.bss
Points3D DR 8 * 3; sommets du cube
Points2D DR 8 * 2; sommets projetes
Matr DR 3 * 3; matrice de rotation
.data
T1 DB 0; angle rotation suivant z
T2 DB 0; angle rotation suivant y
T3 DB 0; angle rotation suivant x
L DB 8 * 65536; longueur d une arete
NL DB, ( (-8) * 65536); oppose de L
V DB 8 * 2; distance pt de vue - plan de l ecran
X0 DB 40; centre de l ecran
Y0 DB 12; centre de l ecran
.text
;
;
; Mult : multiplication de deux pseudos flottants
;
;
Mult: MUL R5, R6;
SHR Rd, 16;
SHL Rg, 16;
ADD R5, Rg, Rd;
RET;
;
;
; InitCube : initialisation des coords des sommets du cube
;
;
InitCube: MOV, Points3D[0], L;
MOV, Points3D[1], L;
MOV, Points3D[2], L;
;
MOV, Points3D[3], L;
MOV, Points3D[4], L;
MOV, Points3D[5], NL;
;
MOV, Points3D[6], L;
MOV, Points3D[7], NL;
MOV, Points3D[8], L;
;
MOV, Points3D[9], L;
MOV, Points3D[10], NL;
MOV, Points3D[11], NL;
;
MOV, Points3D[12], NL;
MOV, Points3D[13], L;
MOV, Points3D[14], L;
;
MOV, Points3D[15], NL;
MOV, Points3D[16], L;
MOV, Points3D[17], NL;
;
MOV, Points3D[18], NL;
MOV, Points3D[19], NL;
MOV, Points3D[20], L;
;
MOV, Points3D[21], NL;
MOV, Points3D[22], NL;
MOV, Points3D[23], NL;
;
RET;
;
;
; MajMatr : mise a jour de la matrice de rotation
;
;
MajMatr: MOV R5, [T1];
MOV R6, COS[R5];
MOV R5, [T2];
MOV R6, COS[R5];
CALL Mult;
MOV, Matr[0+0], R5;
;
; M[1,1] = cosT1*cosT2
;
MOV R5, [T1];
MOV R5, COS[R5];
SUB R5, R0, R5;
MOV R7, R5;
MOV R5, [T2];
MOV R5, SIN[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, SIN[R5];
CALL Mult;
MOV R7, R6;
CALL Mult;
MOV R7, R5;
MOV R5, [T1];
MOV R5, SIN[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, COS[R5];
CALL Mult;
SUB R5, R7, R5;
MOV, Matr[0+1], R5;
;
; M[1,2] = -cosT1*sinT2*sinT3-sinT1*CosT3
;
MOV R5, [T1];
MOV R5, COS[R5];
SUB R5, R0, R5;
MOV R7, R5;
MOV R5, [T2];
MOV R5, SIN[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, COS[R5];
CALL Mult;
MOV R7, R6;
CALL Mult;
MOV R7, R5;
MOV R5, [T1];
MOV R5, SIN[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, SIN[R5];
CALL Mult;
ADD R5, R7, R5;
MOV, Matr[0+2], R5;
;
; M[1,3] = -cosT1*sinT2*cosT3+sinT1*sinT3
;
MOV R5, [T1];
MOV R5, SIN[R5];
MOV R6, R5;
MOV R5, [T2];
MOV R5, COS[R5];
CALL Mult;
MOV, Matr[3+0], R5;
;
; M[2,1] = sinT1*cosT2
;
MOV R5, [T1];
MOV R5, SIN[R5];
SUB R5, R0, R5;
MOV R7, R5;
MOV R5, [T2];
MOV R5, SIN[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, SIN[R5];
CALL Mult;
MOV R7, R6;
CALL Mult;
MOV R7, R5;
MOV R5, [T1];
MOV R5, COS[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, COS[R5];
CALL Mult;
ADD R5, R7, R5;
MOV, Matr[3+1], R5;
;
; M[2,2] = -sinT1*sinT2*sinT3+cosT1*cosT3
;
MOV R5, [T1];
MOV R5, SIN[R5];
SUB R5, R0, R5;
MOV R7, R5;
MOV R5, [T2];
MOV R5, SIN[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, SIN[R5];
CALL Mult;
MOV R7, R6;
CALL Mult;
MOV R7, R5;
MOV R5, [T1];
MOV R5, COS[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, SIN[R5];
CALL Mult;
SUB R5, R7, R5;
MOV, Matr[3+2], R5;
;
; M[2,3] = -sinT1*sinT2*sinT3-cosT1*sinT3
;
MOV R5, [T2];
MOV R5, SIN[R5];
MOV, Matr[6+0], R5;
;
; M[3,1] = sinT2
;
MOV R5, [T2];
MOV R5, COS[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, SIN[R5];
CALL Mult;
MOV, Matr[6+1], R5;
;
; M[3,2] = cosT2*sinT3
;
MOV R5, [T2];
MOV R5, COS[R5];
MOV R6, R5;
MOV R5, [T3];
MOV R5, COS[R5];
CALL Mult;
MOV, Matr[6+2], R5;
;
; M[3,3] = cosT2*cosT3
;
RET;
;
;
; RotCube : Rotation du cube suivant les angles T1, T2, T3
;
;
RotCube: MOV R3, 0;
MOV R4, 24;
BouclCube: MOV R5, Matr[0+0];
MOV R6, Points3D[R3+0];
CALL Mult;
MOV R10, R5;
MOV R5, Matr[0+1];
MOV R6, Points3D[R3+1];
CALL Mult;
ADD R10, R10, R5;
MOV R5, Matr[0+2];
MOV R6, Points3D[R3+2];
CALL Mult;
ADD R10, R10, R5;
; x
MOV R5, Matr[3+0];
MOV R6, Points3D[R3+0];
CALL Mult;
MOV R11, R5;
MOV R5, Matr[3+1];
MOV R6, Points3D[R3+1];
CALL Mult;
ADD R11, R11, R5;
MOV R5, Matr[3+2];
MOV R6, Points3D[R3+2];
CALL Mult;
ADD R11, R11, R5;
; y
MOV R5, Matr[6+0];
MOV R6, Points3D[R3+0];
CALL Mult;
MOV R12, R5;
MOV R5, Matr[6+1];
MOV R6, Points3D[R3+1];
CALL Mult;
ADD R12, R12, R5;
MOV R5, Matr[6+2];
MOV R6, Points3D[R3+2];
CALL Mult;
ADD R12, R12, R5;
; z
MOV, Points3D[R3+0], R10;
MOV, Points3D[R3+1], R11;
MOV, Points3D[R3+2], R12;
ADD R3, R3, 3;
JNE R3, R4, BouclCube;
RET;
;
;
; Proj : Projection du cube sur le plan de l ecran ( perspective )
;
;
Proj: MOV R2, 0;
MOV R3, 0;
MOV R4, 24;
BouclProj: MOV R5, Points3D[R3+0];
MOV R6, [V];
CALL Mult;
MOV R7, Points3D[R3+2];
ADD R6, R6, R7;
DIV R5, R6;
MOV R5, Rg;
SHR R5, 16;
MOV R6, [X0];
ADD R5, R5, R6;
MOV Points2D[R2], R5;
;
; x' = (V*x)/(V+z)
;
MOV R5, Points3D[R3+1];
MOV R6, [V];
CALL Mult;
MOV R7, Points3D[R3+2];
ADD R6, R6, R7;
DIV R5, R6;
MOV R5, Rg;
SHR R5, 16;
MOV R6, [Y0];
ADD R5, R5, R6;
MOV Points2D[R2+1], R5;
;
; y'=(V*y)/(V+z)
;
ADD R2, R2, 2;
ADD R3, R3, 3;
JNE R3, R4, BouclProj;
RET;
;
;
; Draw : trace le cube
;
;
Draw: MOV R7, Points2D[0];
MOV R6, Points2D[1];
MOV R9, Points2D[2];
MOV R8, Points2D[3];
CALL DrawLine;
MOV R7, Points2D[2];
MOV R6, Points2D[3];
MOV R9, Points2D[4];
MOV R8, Points2D[5];
CALL DrawLine;
MOV R7, Points2D[4];
MOV R6, Points2D[5];
MOV R9, Points2D[6];
MOV R8, Points2D[7];
CALL DrawLine;
MOV R7, Points2D[6];
MOV R6, Points2D[7];
MOV R9, Points2D[0];
MOV R8, Points2D[1];
CALL DrawLine;
MOV R7, Points2D[8];
MOV R6, Points2D[9];
MOV R9, Points2D[10];
MOV R8, Points2D[11];
CALL DrawLine;
MOV R7, Points2D[10];
MOV R6, Points2D[11];
MOV R9, Points2D[12];
MOV R8, Points2D[13];
CALL DrawLine;
MOV R7, Points2D[12];
MOV R6, Points2D[13];
MOV R9, Points2D[14];
MOV R8, Points2D[15];
CALL DrawLine;
MOV R7, Points2D[14];
MOV R6, Points2D[15];
MOV R9, Points2D[8];
MOV R8, Points2D[9];
CALL DrawLine;
MOV R7, Points2D[0];
MOV R6, Points2D[1];
MOV R9, Points2D[8];
MOV R8, Points2D[9];
CALL DrawLine;
MOV R7, Points2D[2];
MOV R6, Points2D[3];
MOV R9, Points2D[10];
MOV R8, Points2D[11];
CALL DrawLine;
MOV R7, Points2D[4];
MOV R6, Points2D[5];
MOV R9, Points2D[12];
MOV R8, Points2D[13];
CALL DrawLine;
MOV R7, Points2D[6];
MOV R6, Points2D[7];
MOV R9, Points2D[14];
MOV R8, Points2D[15];
CALL DrawLine;
RET;
;
;
; IncrAngl : incremente T1, T2, T3
;
;
IncrAngl: MOV R5, [T1];
MOV R6, 56;
ADD R5, R5, R6;
MOV R6, 4096;
DIV R5, R6;
MOV, [T1], Rd;
MOV R5, [T2];
MOV R6, 30;
ADD R5, R5, R6;
MOV R6, 4096;
DIV R5, R6;
MOV, [T2], Rd;
MOV R5, [T3];
MOV R6, 80;
ADD R5, R5, R6;
MOV R6, 4096;
DIV R5, R6;
MOV, [T3], Rd;
RET;
;
;
; Main : boucle principale
;
;
.start
CALL InitCube;
Main: CALL IncrAngl;
CALL MajMatr;
CALL RotCube;
CALL Proj;
CALL ClrScr;
CALL Draw;
JMP Main;
|
