Programming:CPC Plus Hardware Sprites - Revision history

Fgbrain at 12:04, 2 February 2014

2014-02-02T12:04:29Z

Fgbrain at 12:01, 2 February 2014

2014-02-02T12:01:59Z

Fgbrain at 12:00, 2 February 2014

2014-02-02T12:00:06Z

MacDeath at 15:18, 8 October 2009

2009-10-08T15:18:40Z

Octoate: added category

2007-03-12T15:59:57Z

added category

CPCLER at 15:45, 12 March 2007

2007-03-12T15:45:54Z

80.167.220.254 at 14:33, 12 March 2007

2007-03-12T14:33:56Z

New page

<pre>
;; This example shows a CPC+ hardware sprite.
;;
;; This example is designed for CPC+ only and will
;; not work on CPC or KC Compact.
;;
;;
;; This example will compile with the MAXAM assembler
;; or the built-in assembler of WinAPE32.

;; NOTE - For this example to work, the code must not
;; be in the range &4000-&7fff inclusive. The ASIC registers
;; are paged into this range, and the code would not be
;; visible to the CPU if it was also in this range.
org &8000

;;--------------------------------------------------
;; STEP 1 - Unlock CPC+ additional features
;; unlock asic to gain access to asic registers

di
ld b,&bc
ld hl,sequence
ld e,17
.seq
ld a,(hl)
out (c),a
inc hl
dec e
jr nz,seq
ei

;;--------------------------------------------------
;; STEP 2 - Setup sprite pixel data
;;
;; The ASIC has internal "RAM" used to store the sprite pixel
;; data. If you want to change the pixel data for a sprite
;; then you need to copy new data into the internal "RAM".

;; page-in asic registers to &4000-&7fff
ld bc,&7fb8
out (c),c

;; stored sprite pixel data
ld hl,sprite_pixel_data

;; address of sprite 0 pixel data
;; sprite 0 pixel data is in the range &4000-&4100
ld de,&4000

;; length of pixel data for a single sprite (16x16 = 256)
ld bc,&100
ldir

;; page-out asic registers
ld bc,&7fa0
out (c),c

;;--------------------------------------------------
;; STEP 3 - Setup sprite palette
;;
;; The sprites use a single 15 entry sprite palette.
;; pen 0 is ALWAYS transparent.
;;
;; The sprite palette is different to the screen palette.

;; page-in asic registers to &4000-&7fff
ld bc,&7fb8
out (c),c

;; copy colours into ASIC sprite palette registers
ld hl,sprite_colours
ld de,&6422
ld bc,15*2
ldir

;; page-out asic registers
ld bc,&7fa0
out (c),c

;;--------------------------------------------------
;; STEP 4 - Setup sprite properties
;;
;; Each sprite has properties which define the x,y coordinates
;; and x,y magnification.

;; page-in asic registers to &4000-&7fff
ld bc,&7fb8
out (c),c

;; set x coordinate for sprite 0
ld hl,100
ld (&6000),hl

;; set y coordinate for sprite 0
ld hl,100
ld (&6002),hl

;; set sprite x and y magnification
;; x magnification = 1
;; y magnification = 1
ld a,%0101
ld (&6004),a

;; page-out asic registers
ld bc,&7fa0
out (c),c

;;--------------------------------------------------
ret

;;--------------------------------------------------
;; - there is two bytes per colour.
;; - these are stored in a form that can be written direct
;; to the CPC+ colour palette registers (i.e. xGRB)
;; - pen 0 is always transparent and doesn't have a entry
;; in the CPC+ palette

.sprite_colours
defw &0111 ;; colour for sprite pen 1
defw &0222 ;; colour for sprite pen 2
defw &0333 ;; colour for sprite pen 3
defw &0444 ;; colour for sprite pen 4
defw &0555 ;; colour for sprite pen 5
defw &0666 ;; colour for sprite pen 6
defw &0777 ;; colour for sprite pen 7
defw &0888 ;; colour for sprite pen 8
defw &0999 ;; colour for sprite pen 9
defw &0aaa ;; colour for sprite pen 10
defw &0bbb ;; colour for sprite pen 11
defw &0ccc ;; colour for sprite pen 12
defw &0ddd ;; colour for sprite pen 13
defw &0eee ;; colour for sprite pen 14
defw &0fff ;; colour for sprite pen 15

;;---------------------------------------------
;; - there is one pixel per byte (bits 3..0 of each byte define the palette index for this pixel)
;; - these bytes are stored in a form that can be written direct to the ASIC
;; sprite pixel data
.sprite_pixel_data
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 0
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 1
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 2
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 3
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 4
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 5
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 6
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 7
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 8
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 9
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 10
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 11
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 12
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 13
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 14
defb &00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00,&00 ;; line 15

;;----------------------------------------------------------
;; this is the sequence to unlock the ASIC extra features
.sequence
defb &ff,&00,&ff,&77,&b3,&51,&a8,&d4,&62,&39,&9c,&46,&2b,&15,&8a,&cd,&ee
</pre>

@@ Line 21: / Line 21: @@
 '''HW Sprite colours:'''
-Each sprite has its own colours (up to 4096), so 2 bytes areequired for each colour.
+Each sprite has its own colours (up to 4096), so 2 bytes are required for each colour.
 ;#6422 - Sprite Color Pen 1
 ;#6424 - Sprite Color Pen 2
@@ Line 72: / Line 72: @@
 ;#607a - Spr 15 Pos Y
 '''HW Sprite resolution:'''
 #value 00 => Sprite not visible
 #value 01 => Sprite resolution 640 (magnify x1 - mode 2)

@@ Line 2: / Line 2: @@
 ''' HW Sprite addresses: '''
-Each sprites takes 16x16=256  (#100) bytes in ASIC memory
+Each sprite takes 16x16=256  (#100) bytes in ASIC memory
 ;#4000 - Sprite 0
 ;#4100 - Sprite 1
@@ Line 21: / Line 21: @@
 '''HW Sprite colours:'''
 ;#6422 - Sprite Color Pen 1
 ;#6424 - Sprite Color Pen 2

← Older revision		Revision as of 12:00, 2 February 2014
Line 1:		Line 1:
		+	== [[ASIC]] memory addresses for HW Sprites (in HEX) ==
		+
		+	''' HW Sprite addresses: '''
		+	Each sprites takes 16x16=256 (#100) bytes in ASIC memory
		+	;#4000 - Sprite 0
		+	;#4100 - Sprite 1
		+	;#4200 - Sprite 2
		+	;#4300 - Sprite 3
		+	;#4400 - Sprite 4
		+	;#4500 - Sprite 5
		+	;#4600 - Sprite 6
		+	;#4700 - Sprite 7
		+	;#4800 - Sprite 8
		+	;#4900 - Sprite 9
		+	;#4A00 - Sprite #0A (10)
		+	;#4B00 - Sprite #0B (11)
		+	;#4C00 - Sprite #0C (12)
		+	;#4D00 - Sprite #0D (13)
		+	;#4E00 - Sprite #0E (14)
		+	;#4F00 - Sprite #0F (15)
		+
		+	'''HW Sprite colours:'''
		+	;#6422 - Sprite Color Pen 1
		+	;#6424 - Sprite Color Pen 2
		+	;#6426 - Sprite Color Pen 3
		+	;#6428 - Sprite Color Pen 4
		+	;#642a - Sprite Color Pen 5
		+	;#642c - Sprite Color Pen 6
		+	;#642e - Sprite Color Pen 7
		+	;#6430 - Sprite Color Pen 8
		+	;#6432 - Sprite Color Pen 9
		+	;#6434 - Sprite Color Pen 10
		+	;#6436 - Sprite Color Pen 11
		+	;#6438 - Sprite Color Pen 12
		+	;#643a - Sprite Color Pen 13
		+	;#643c - Sprite Color Pen 14
		+	;#643e - Sprite Color Pen 15
		+
		+	'''HW Sprite position x,y'''
		+	;#6000 - Spr 0 Pos X
		+	;#6002 - Spr 0 Pos Y
		+	;#6008 - Spr 1 Pos X
		+	;#600a - Spr 1 Pos Y
		+	;#6010 - Spr 2 Pos X
		+	;#6012 - Spr 2 Pos Y
		+	;#6018 - Spr 3 Pos X
		+	;#601a - Spr 3 Pos Y
		+	;#6020 - Spr 4 Pos X
		+	;#6022 - Spr 4 Pos Y
		+	;#6028 - Spr 5 Pos X
		+	;#602a - Spr 5 Pos Y
		+	;#6030 - Spr 6 Pos X
		+	;#6032 - Spr 6 Pos Y
		+	;#6038 - Spr 7 Pos X
		+	;#603A - Spr 7 Pos Y
		+	;#6040 - Spr 8 Pos X
		+	;#6042 - Spr 8 Pos Y
		+	;#6048 - Spr 9 Pos X
		+	;#604a - Spr 9 Pos Y
		+	;#6050 - Spr 10 Pos X
		+	;#6052 - Spr 10 Pos Y
		+	;#6058 - Spr 11 Pos X
		+	;#605a - Spr 11 Pos Y
		+	;#6060 - Spr 12 Pos X
		+	;#6062 - Spr 12 Pos Y
		+	;#6068 - Spr 13 Pos X
		+	;#606a - Spr 13 Pos Y
		+	;#6070 - Spr 14 pos X
		+	;#6072 - Spr 14 Pos Y
		+	;#6078 - Spr 15 Pos X
		+	;#607a - Spr 15 Pos Y
		+
		+	'''HW Sprite resolution:'''
		+	#value 00 => Sprite not visible
		+	#value 01 => Sprite resolution 640 (magnify x1 - mode 2)
		+	#value 10 => Sprite resolution 320 (magnify x2 - mode 1)
		+	#value 11 => Sprite resolution 160 (magnify x4 - mode 0)
		+	;#6004 - Sprite 0 resolution
		+	;#600c - Sprite 1 resolution
		+	;#6014 - Sprite 2 resolution
		+	;#601c - Sprite 3 resolution
		+	;#6024 - Sprite 4 resolution
		+	;#602c - Sprite 5 resolution
		+	;#6034 - Sprite 6 resolution
		+	;#603c - Sprite 7 resolution
		+	;#6044 - Sprite 8 resolution
		+	;#604c - Sprite 9 resolution
		+	;#6054 - Sprite 10 resolution
		+	;#605c - Sprite 11 resolution
		+	;#6064 - Sprite 12 resolution
		+	;#606c - Sprite 13 resolution
		+	;#6074 - Sprite 14 resolution
		+	;#607c - Sprite 15 resolution
		+
		+	== Coding example ==
		+
	From the '''The Unofficial Amstrad WWW Resource'''		From the '''The Unofficial Amstrad WWW Resource'''

@@ Line 169: / Line 169: @@
 defb &ff,&00,&ff,&77,&b3,&51,&a8,&d4,&62,&39,&9c,&46,&2b,&15,&8a,&cd,&ee
 </pre>
 [[Category:CPC Plus]]
 [[Category:Programming]]

← Older revision		Revision as of 15:59, 12 March 2007
Line 169:		Line 169:
	defb &ff,&00,&ff,&77,&b3,&51,&a8,&d4,&62,&39,&9c,&46,&2b,&15,&8a,&cd,&ee		defb &ff,&00,&ff,&77,&b3,&51,&a8,&d4,&62,&39,&9c,&46,&2b,&15,&8a,&cd,&ee
	</pre>		</pre>
		+
		+	[[Category:CPC Plus]]
		+	[[Category:Programming]]

← Older revision		Revision as of 15:45, 12 March 2007
Line 1:		Line 1:
		+	From the '''The Unofficial Amstrad WWW Resource'''
		+
	<pre>		<pre>
	;; This example shows a CPC+ hardware sprite.		;; This example shows a CPC+ hardware sprite.