mirror of https://github.com/nmlgc/ReC98.git
36 lines
1.4 KiB
C
36 lines
1.4 KiB
C
|
// Function numbers for the SPRITE16.COM driver, according to SPRITE16.DOC.
|
||
|
|
// Refer to this file for the actual documentation on the functions itself,
|
||
|
|
// the comments here only provide additional context.
|
||
|
|
// Only includes functions that are actually used in TH03.
|
||
|
|
|
||
|
|
#define SPRITE16 0x42
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
// Derives SPRITE16's internal alpha masks used for monochrome and
|
||
|
|
// overlapped drawing from the sprite data area in VRAM. Should
|
||
|
|
// consequently be called after every change to that area.
|
||
|
|
SPRITE16_GENERATE_ALPHA = 1,
|
||
|
|
SPRITE16_PUT = 2,
|
||
|
|
SPRITE16_SET_MONO = 3,
|
||
|
|
SPRITE16_SET_COLOR = 4,
|
||
|
|
// Determines whether the VRAM area that will be occupied by newly drawn
|
||
|
|
// sprites will be
|
||
|
|
// • cleared using the alpha mask generated by SPRITE16_GENERATE_ALPHA
|
||
|
|
// before drawing (DX = OVERLAP_CLEAR, default)
|
||
|
|
// • or left as is, with the bits of the new sprite being ORed on top of
|
||
|
|
// the existing VRAM content, separately on every individual bitplane
|
||
|
|
// (DX = OVERLAP_OR). This will consequently produce interesting colors
|
||
|
|
// wherever two sprites overlap.
|
||
|
|
// This setting is ignored when in monochrome mode, which always touches
|
||
|
|
// all bitplanes according to the alpha mask, identical to monochrome
|
||
|
|
// blitting using the GRCG in RMW mode (e.g. using master.lib's
|
||
|
|
// grcg_setcolor()).
|
||
|
|
SPRITE16_SET_OVERLAP = 5,
|
||
|
|
SPRITE16_SET_MASK = 8
|
||
|
|
} sprite16_func_t;
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
OVERLAP_CLEAR = 1,
|
||
|
|
OVERLAP_OR = 0
|
||
|
|
} sprite16_overlap_t;
|