Difference between revisions of "Programming:Amstrad CPC plus sprite format"
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| + | The sprites of the of the Amstrad CPC plus is always 16 x 16 pixels of size. | ||
| + | |||
| + | == The data == | ||
| + | |||
| + | Each sprite has the ability to show 15 distinct colours, the pixel colours are indexed #0 - #F. | ||
| + | |||
| + | Index #0 is always transparency, whereas index #1 - #F is the colour index in the sprite palette. | ||
| + | |||
| + | To define a sprite in the ASIC. 16 x 16 (256) bytes must be transferred to the ASIC. | ||
| + | |||
| + | The format of the data is straight forward. The data is organized in a linear manner. Each sprite pixel uses a single byte, the upper nibble is ignored by the ASIC. | ||
| + | |||
| + | == The colour palette == | ||
| + | |||
| + | |||
| + | == Example == | ||
| + | |||
| + | Below is shown an example of how a sprite is organized into raw data. | ||
| + | |||
| + | [[Image:Cpcplussprite.png|400px]] | ||
| + | |||
<geshi lang=Z80> | <geshi lang=Z80> | ||
.pac_sprite | .pac_sprite | ||
| Line 49: | Line 70: | ||
dw #0000 ; Red = #F Green = #F Blue = #F ; The white in the PAC's eyes | dw #0000 ; Red = #F Green = #F Blue = #F ; The white in the PAC's eyes | ||
</geshi> | </geshi> | ||
| + | |||
| + | == Links == | ||
[[Category:CPC Plus]] | [[Category:CPC Plus]] | ||
Revision as of 18:59, 14 July 2009
The sprites of the of the Amstrad CPC plus is always 16 x 16 pixels of size.
Contents
The data
Each sprite has the ability to show 15 distinct colours, the pixel colours are indexed #0 - #F.
Index #0 is always transparency, whereas index #1 - #F is the colour index in the sprite palette.
To define a sprite in the ASIC. 16 x 16 (256) bytes must be transferred to the ASIC.
The format of the data is straight forward. The data is organized in a linear manner. Each sprite pixel uses a single byte, the upper nibble is ignored by the ASIC.
The colour palette
Example
Below is shown an example of how a sprite is organized into raw data.
<geshi lang=Z80> .pac_sprite
- The raw sprite data - to be transfered to the ASIC
db #00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00 db #00,#00,#00,#00,#00,#00,#01,#01,#01,#01,#00,#00,#00,#00,#00,#00 db #00,#00,#00,#00,#01,#01,#01,#01,#01,#01,#01,#01,#00,#00,#00,#00 db #00,#00,#00,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#00,#00,#00 db #00,#00,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#00,#00 db #00,#00,#01,#01,#03,#03,#01,#01,#01,#01,#03,#03,#01,#01,#00,#00 db #00,#00,#01,#03,#03,#03,#03,#01,#01,#03,#03,#03,#03,#01,#00,#00 db #00,#01,#01,#03,#03,#03,#03,#01,#01,#03,#03,#03,#03,#01,#01,#00 db #00,#01,#01,#03,#02,#02,#03,#01,#01,#03,#02,#02,#03,#01,#01,#00 db #00,#01,#01,#01,#02,#02,#01,#01,#01,#01,#02,#02,#01,#01,#01,#00 db #00,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#00 db #00,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#01,#00 db #00,#01,#01,#01,#00,#01,#01,#01,#01,#01,#01,#00,#01,#01,#01,#00 db #00,#00,#01,#00,#00,#00,#01,#01,#01,#01,#00,#00,#00,#01,#00,#00 db #00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00 db #00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00,#00
- Compressed data
db #00,#00,#00,#00,#00,#00,#00,#00 db #00,#00,#00,#11,#11,#00,#00,#00 db #00,#00,#11,#11,#11,#11,#00,#00 db #00,#01,#11,#11,#11,#11,#10,#00 db #00,#11,#11,#11,#11,#11,#11,#00 db #00,#11,#33,#11,#11,#33,#11,#00 db #00,#13,#33,#31,#13,#33,#31,#00 db #01,#13,#33,#31,#13,#33,#31,#10 db #01,#13,#22,#31,#13,#22,#31,#10 db #01,#11,#22,#11,#11,#22,#11,#10 db #01,#11,#11,#11,#11,#11,#11,#10 db #01,#11,#11,#11,#11,#11,#11,#10 db #01,#11,#01,#11,#11,#10,#11,#10 db #00,#10,#00,#11,#11,#00,#01,#00 db #00,#00,#00,#00,#00,#00,#00,#00 db #00,#00,#00,#00,#00,#00,#00,#00
.pack_sprite_palette
- Sprite ink 1
dw #0CDF ; Red = #D Green = #C Blue = #F ; The gray body
- Sprite ink 2
dw #0000 ; Red = #0 Green = #0 Blue = #0 ; The black in the PAC's eyes
- Sprite ink 3
dw #0000 ; Red = #F Green = #F Blue = #F ; The white in the PAC's eyes </geshi>
