Changes

*D,E sprite dimension in char units (width,height,width)

*1 byte BYTE : attribute (afaik only used for color after AND 3)*BYTE*8 bytes : 1bit graphics , only presents present if attribute <> #36

there Attribute seems to be only used to compute color, only the 2 lower bits are used like this :* 10 (2) : color 1* 11 (3) : color 3* 00 (0) or 01 (1) : color 2 There are 2 routines to solve sprite dimensions and adress from a sprite number in A : #8E97 for basic sprites (héro,modules,weapons,logo,etc...) and #8E90 for levels sprites.Theses routines return pixels address in HL and dimensions in char units in D,E.

*BYTE widthin char units*BYTE heightin char units

The basic sprites table if located at #BC67 and level sprites adress table address can be found at (#C4BA) Here is some example code written in Basic to convert R-Type sprites from uncompressed 64K type 1 SNA to BMP format :[[file:R_extractspr.x]]  Example : [[File:Spr_40.png‎]] (Violet chars are marked as #36 so they are ignored) [[User:Fano|Fano]] 16:47, 21 November 2009 (UTC) ==Level graphics== Let's continue for 2K10 ! Game screen is composed of 8*5 blocks of 4*4 chars (8*8 pixies).Blocks are stored in memory in the same way as sprites except char pixies are always presents. Per char : *BYTE : flags, defines color, bit 7 defines if char is solid.*BYTE*8 : 1bit graphics There are 16 chars so 144 bytes per block. Levels are composed of columns of 5 blocks.The first column of the level is located at #C4B1 (byte).The column number 0 is located at (#C4BC) A column address (word) can be computed like this : (column*5) + (#C4BC) Each byte of the column is a block number :* bit 7 -> set if verticaly reversed* bit 6 -> set if horizontaly reversed* bits 0->5 block index Using block index , it is possible to compute address (word) with this simple formula :  (#C4BC)-((index+1)*144)  Routine at #167B solves block index in A and return block address in HL. Code located at #5C4F draws the first screen of the level before scrolling.It uses the sprite code (#8D08,#8D70,#8DDE,#8E34) to put the level graphics on screen. Current column is located at #7A84 and there is a copy of (#C4BC) at #C4AE.When game passes a checkpoint , it saves the current column at #C4AE so when player dies, game restarts at #C4AE. Code located at #8A7F feeds scrolling , update attribute array , draw blocks on right side of the screen.There are 4 routines to feed scroll according to reverse flags. * #1E4C - x=N y=N* #1E83 - x=R y=N* #1EC3 - x=N y=R* #1640 - x=R y=R

[[User:Fano|Fano]] 1020:4323, 21 November 2009 6 January 2010 (UTC)