150 lines
5.2 KiB
ArmAsm
150 lines
5.2 KiB
ArmAsm
; Functions to handle rendering sprite information into buffers for updates to the
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; code field. Due to lack of parallel structure, the sprites are combined with the
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; tile data and then written to a single direct page buffer. The data is read from
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; this buffer and then applied to the code field
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; Merge a single block of sprite data with a tile
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_OneSprite_00
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_OneSprite_H0
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ldx TileStore+TS_VBUFF_ADDR_0,y
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lda TileStore+TS_TILE_ADDR,y
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tay
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]line equ 0
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lup 8
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lda tiledata+{]line*TILE_DATA_SPAN},y
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andl spritemask+{]line*SPRITE_PLANE_SPAN},x
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oral spritedata+{]line*SPRITE_PLANE_SPAN},x
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sta tmp_sprite_data+{]line*4}
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lda tiledata+{]line*TILE_DATA_SPAN}+2,y
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andl spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
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oral spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
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sta tmp_sprite_data+{]line*4}+2
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]line equ ]line+1
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--^
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_OneSprite_V0
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_OneSprite_VH
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ldx TileStore+TS_VBUFF_ADDR_0,y
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lda TileStore+TS_TILE_ADDR,y
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tay
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]line equ 7
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]dest equ 0
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lup 8
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lda tiledata+{]line*TILE_DATA_SPAN},y
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andl spritemask+{]dest*SPRITE_PLANE_SPAN},x
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oral spritedata+{]dest*SPRITE_PLANE_SPAN},x
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sta tmp_sprite_data+{]dest*4}
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lda tiledata+{]line*TILE_DATA_SPAN}+2,y
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andl spritemask+{]dest*SPRITE_PLANE_SPAN}+2,x
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oral spritedata+{]dest*SPRITE_PLANE_SPAN}+2,x
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sta tmp_sprite_data+{]dest*4}+2
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]line equ ]line-1
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]dest equ ]dest+1
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--^
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rts
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; Merge two blocks of sprite data. This is more involved because we need to use the
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; direct page pointers to stack the sprite information
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_TwoSprite_00
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_TwoSprite_H0
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lda TileStore+TS_VBUFF_ADDR_0,y
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sta sprite_0
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lda TileStore+TS_VBUFF_ADDR_1,y
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sta sprite_1
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ldx TileStore+TS_TILE_ADDR,y
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; line 0
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lda tiledata+{0*TILE_DATA_SPAN},x
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and [sprite_1]
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ora (sprite_1)
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and [sprite_0]
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ora (sprite_0)
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sta tmp_sprite_data+{0*4}
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ldy #{0*SPRITE_PLANE_SPAN}+2
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lda tiledata+{0*TILE_DATA_SPAN}+2,x
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and [sprite_1],y
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ora (sprite_1),y
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and [sprite_0],y
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ora (sprite_0),y
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sta tmp_sprite_data+{0*4}+2
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; line 1
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ldy #{1*SPRITE_PLANE_SPAN}
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lda tiledata+{1*TILE_DATA_SPAN},x
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and [sprite_1],y
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ora (sprite_1),y
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and [sprite_0],y
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ora (sprite_0),y
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sta tmp_sprite_data+{1*4}
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ldy #{1*SPRITE_PLANE_SPAN}+2
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lda tiledata+{1*TILE_DATA_SPAN}+2,x
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and [sprite_1],y
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ora (sprite_1),y
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and [sprite_0],y
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ora (sprite_0),y
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sta tmp_sprite_data+{1*4}+2
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rts
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; Merge three blocks of sprite data. This is more involved because we need to use the
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; direct page pointers to stack the sprite information
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_ThreeSprite_00
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_ThreeSprite_H0
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lda TileStore+TS_VBUFF_ADDR_0,y
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sta sprite_0
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lda TileStore+TS_VBUFF_ADDR_1,y
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sta sprite_1
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lda TileStore+TS_VBUFF_ADDR_2,y
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sta sprite_2
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ldx TileStore+TS_TILE_ADDR,y
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; line 0
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lda tiledata+{0*TILE_DATA_SPAN},x
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and [sprite_2]
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ora (sprite_2)
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and [sprite_1]
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ora (sprite_1)
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and [sprite_0]
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ora (sprite_0)
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sta tmp_sprite_data+{0*4}
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ldy #{0*SPRITE_PLANE_SPAN}+2
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lda tiledata+{0*TILE_DATA_SPAN}+2,x
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and [sprite_2],y
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ora (sprite_2),y
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and [sprite_1],y
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ora (sprite_1),y
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and [sprite_0],y
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ora (sprite_0),y
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sta tmp_sprite_data+{0*4}+2
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; line 1
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ldy #{1*SPRITE_PLANE_SPAN}
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lda tiledata+{1*TILE_DATA_SPAN},x
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and [sprite_2],y
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ora (sprite_2),y
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and [sprite_1],y
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ora (sprite_1),y
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and [sprite_0],y
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ora (sprite_0),y
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sta tmp_sprite_data+{1*4}
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ldy #{1*SPRITE_PLANE_SPAN}+2
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lda tiledata+{1*TILE_DATA_SPAN}+2,x
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and [sprite_2],y
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ora (sprite_2),y
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and [sprite_1],y
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ora (sprite_1),y
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and [sprite_0],y
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ora (sprite_0),y
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sta tmp_sprite_data+{1*4}+2
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rts |