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vdp1/normal_sprite_animated: improve for real hardware

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This commit is contained in:
Zack Buhman 2023-03-12 01:50:57 +00:00
parent 40238e2621
commit f5959ab4bf
1 changed files with 6 additions and 2 deletions
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8
vdp1/normal_sprite_animated.cpp
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@ -83,8 +83,8 @@ constexpr uint32_t sprite_height = 100;
constexpr uint32_t sprite_last_frame = 15;
static uint32_t color_address, character_address;
static uint32_t sprite_frame_index;
static uint32_t animation_timer;
static uint32_t sprite_frame_index;
// __attribute__ ((interrupt_handler)) changes code generation behavior for this
// function works. `rts` as generated in normal functions is replaced with
@ -94,8 +94,9 @@ void v_blank_in(void)
{
// clear V_BLANK_IN interrupt status
scu.reg.IST &= ~(IST__V_BLANK_IN);
scu.reg.IMS = ~(IMS__V_BLANK_IN);
if (++animation_timer < 4)
if (++animation_timer < 6)
return;
else
animation_timer = 0;
@ -117,6 +118,9 @@ void main()
vdp2.reg.TVMD = ( TVMD__DISP | TVMD__LSMD__NON_INTERLACE
| TVMD__VRESO__240 | TVMD__HRESO__NORMAL_320);
// disable all VDP2 backgrounds (e.g: the Sega bios logo)
vdp2.reg.BGON = 0;
// VDP2 User's Manual:
// "When sprite data is in an RGB format, sprite register 0 is selected"
// "When the value of a priority number is 0h, it is read as transparent"