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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, Rd, 16;
+	SHL	Rg, 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];
+	CALL 	Cosinus;
+	MOV	R6, R5;
+	MOV	R5, [T2];
+	CALL	Cosinus;
+	CALL	Mult;
+	MOV,	Matr[0+0], R5;
+;	
+; M[1,1] = cosT1*cosT2
+;
+	MOV	R5, [T1];
+	CALL	Cosinus;
+	SUB	R5, R0, R5;
+	MOV	R7, R5;
+	MOV 	R5, [T2];
+	CALL	Sinus;
+	MOV	R6, R5;
+	MOV	R5, [T3];
+	CALL	Sinus;
+	CALL	Mult;
+	MOV	R7, R6;
+	CALL	Mult;
+	MOV 	R7, R5;
+	MOV	R5, [T1];
+	CALL	Sinus;
+	MOV	R6, R5;
+	MOV 	R5, [T3];
+	CALL	Cosinus;
+	CALL	Mult;
+	SUB	R5, R7, R5;
+	MOV,	Matr[0+1], R5;
+;
+; M[1,2] = -cosT1*sinT2*sinT3-sinT1*CosT3		  
+;
+	MOV	R5, [T1];
+	CALL	Cosinus;
+	SUB	R5, R0, R5;
+	MOV	R7, R5;
+	MOV 	R5, [T2];
+	CALL	Sinus;
+	MOV	R6, R5;
+	MOV	R5, [T3];
+	CALL	Cosinus;
+	CALL	Mult;
+	MOV	R7, R6;
+	CALL	Mult;
+	MOV 	R7, R5;
+	MOV	R5, [T1];
+	CALL	Sinus;
+	MOV	R6, R5;
+	MOV 	R5, [T3];
+	CALL	Sinus;
+	CALL	Mult;
+	ADD	R5, R7, R5;
+	MOV,	Matr[0+2], R5;
+;
+; M[1,3] = -cosT1*sinT2*cosT3+sinT1*sinT3
+;
+	MOV	R5, [T1];
+	CALL 	Sinus;
+	MOV	R6, R5;
+	MOV	R5, [T2];
+	CALL	Cosinus;
+	CALL	Mult;
+	MOV,	Matr[3+0], R5;
+;
+; M[2,1] = sinT1*cosT2	 
+;
+	MOV	R5, [T1];
+	CALL	Sinus;
+	SUB	R5, R0, R5;
+	MOV	R7, R5;
+	MOV 	R5, [T2];
+	CALL	Sinus;
+	MOV	R6, R5;
+	MOV	R5, [T3];
+	CALL	Sinus;
+	CALL	Mult;
+	MOV	R7, R6;
+	CALL	Mult;
+	MOV 	R7, R5;
+	MOV	R5, [T1];
+	CALL	Cosinus;
+	MOV	R6, R5;
+	MOV 	R5, [T3];
+	CALL	Cosinus;
+	CALL	Mult;
+	ADD	R5, R7, R5;
+	MOV,	Matr[3+1], R5;
+;
+; M[2,2] = -sinT1*sinT2*sinT3+cosT1*cosT3		  
+;
+	MOV	R5, [T1];
+	CALL	Sinus;
+	SUB	R5, R0, R5;
+	MOV	R7, R5;
+	MOV 	R5, [T2];
+	CALL	Sinus;
+	MOV	R6, R5;
+	MOV	R5, [T3];
+	CALL	Sinus;
+	CALL	Mult;
+	MOV	R7, R6;
+	CALL	Mult;
+	MOV 	R7, R5;
+	MOV	R5, [T1];
+	CALL	Cosinus;
+	MOV	R6, R5;
+	MOV 	R5, [T3];
+	CALL	Sinus;
+	CALL	Mult;
+	SUB	R5, R7, R5;
+	MOV,	Matr[3+2], R5;
+;	
+; M[2,3] = -sinT1*sinT2*sinT3-cosT1*sinT3
+;
+	MOV	R5, [T2];
+	CALL	Sinus;
+	MOV,	Matr[6+0], R5;
+;
+; M[3,1] = sinT2
+;
+	MOV	R5, [T2];
+	CALL	Cosinus;
+	MOV	R6, R5;
+	MOV	R5, [T3];
+	CALL	Sinus;
+	CALL	Mult;
+	MOV, 	Matr[6+1], R5;
+;
+; M[3,2] = cosT2*sinT3
+;
+	MOV	R5, [T2];
+	CALL	Cosinus;
+	MOV	R6, R5;
+	MOV	R5, [T3];
+	CALL	Cosinus;
+	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, 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, 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,	[T1], R5;
+	MOV	R5, [T2];
+	MOV	R6, 30;
+	ADD	R5, R5, R6;
+	MOV,	[T2], R5;
+	MOV	R5, [T3];
+	MOV	R6, 80;
+	ADD	R5, R5, R6;
+	MOV,	[T3], R5;	
+	RET;
+
+;
+;
+; Main : boucle principale
+;
+;
+.start
+	CALL	InitTrig; 
+	CALL	InitCube; 
+Main: 	CALL	IncrAngl;
+	CALL	MajMatr;
+	CALL	RotCube;
+	CALL	Proj;
+	CALL	ClrScr;
+	CALL	Draw;
+	JMP	Main;
\ No newline at end of file