Cyberun: Routine at F7EB

Used by the routine at BuildTables.

Builds the shifted copies of the descriptions of the ground textures (see ShapeDescriptions). Each description is merged into three buffers, shifted by two, four and six pixels to the right, so that the terrain can be drawn at any horizontal pixel position. Those buffers are in ShiftedShapesOne to F10E. Four of the descriptions are read in the format of BuildShiftedShapeB, two in the format that BuildShiftedShapeA handles, and the last three in the format of BuildShiftedShapeB again with HorizontalStepSize set to FF.

Used by the routine at BuildTables. Builds the shifted copies of the descriptions of the ground textures (see ShapeDescriptions). Each description is merged into three buffers, shifted by two, four and six pixels to the right, so that the terrain can be drawn at any horizontal pixel position. Those buffers are in ShiftedShapesOne to F10E. Four of the descriptions are read in the format of BuildShiftedShapeB, two in the format that BuildShiftedShapeA handles, and the last three in the format of BuildShiftedShapeB again with HorizontalStepSize set to FF.
BuildShapeTables	F7EB	LD HL,$5C1C	The working variables start here.
	F7EE	LD B,$26	B=26.
	F7F0	CALL ClearBytes	Call ClearBytes.
	F7F3	XOR A	Clear A.
	F7F4	LD ($5C25),A	The shapes are built front to back.
Make the copies of each description, with the description in HL and the buffer for the copies in HL'.
BuildShapeTables_First	F7F7	LD HL,$E74A	The shifted shapes one.
	F7FA	EXX	Switch to the alternate registers.
	F7FB	LD HL,$E64B	The fourth shape description.
	F7FE	CALL BuildShiftedShapeB	Call BuildShiftedShapeB.
	F801	LD HL,$E804	The shifted shapes two.
	F804	EXX	Switch to the alternate registers.
	F805	LD HL,$E6A2	The sixth shape description.
	F808	CALL BuildShiftedShapeB	Call BuildShiftedShapeB.
	F80B	LD HL,$E91E	The shifted shapes three.
	F80E	EXX	Switch to the alternate registers.
	F80F	LD HL,$E713	The eighth shape description.
	F812	CALL BuildShiftedShapeB	Call BuildShiftedShapeB.
	F815	LD HL,$EC96	The shifted shapes six.
	F818	EXX	Switch to the alternate registers.
	F819	LD HL,$EC60	The shape description.
	F81C	CALL BuildShiftedShapeB	Call BuildShiftedShapeB.
	F81F	LD HL,$EA68	The shifted shapes four.
	F822	EXX	Switch to the alternate registers.
The next two descriptions use the other format.
	F823	LD HL,$E581	The shape descriptions.
	F826	CALL BuildShiftedShapeA	Call BuildShiftedShapeA.
	F829	LD HL,$EB64	The shifted shapes five.
	F82C	EXX	Switch to the alternate registers.
	F82D	LD HL,$E5D7	The second shape description.
	F830	CALL BuildShiftedShapeA	Call BuildShiftedShapeA.
The last three descriptions are built with the flag at HorizontalStepSize set.
	F833	OR %11111111	Set the bits of A that are set in FF.
	F835	LD ($5C25),A	The last shapes are built back to front.
	F838	LD HL,$EDE0	The shifted shapes seven.
	F83B	EXX	Switch to the alternate registers.
	F83C	LD HL,$E62D	The third shape description.
	F83F	CALL BuildShiftedShapeB	Call BuildShiftedShapeB.
	F842	LD HL,$EE9A	The shifted shapes eight.
	F845	EXX	Switch to the alternate registers.
	F846	LD HL,$E669	The fifth shape description.
	F849	CALL BuildShiftedShapeB	Call BuildShiftedShapeB.
	F84C	LD HL,$EFB1	The shifted shapes nine.
	F84F	EXX	Switch to the alternate registers.
	F850	LD HL,$E6DD	The seventh shape description.
	F853	JP BuildShiftedShapeB	Jump to BuildShiftedShapeB.