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Include latest peanut_gb.h from deltabeard (commit bbf094a): gb: fix LY=LYC timing

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This fixes an issue whereby LY was being incremented after the
comparison with LY=LYC. This fixes the dmg-acid2 test.
This commit is contained in:
Vincent Mistler
2023-04-05 18:19:05 +02:00
parent bbd3a1d959
commit da9680c9c7
1 changed files with 51 additions and 45 deletions
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inc/peanut_gb.h
+20 -14
View File
@@ -173,11 +173,16 @@
#define LCDC_OBJ_ENABLE 0x02
#define LCDC_BG_ENABLE 0x01
/* LCD characteristics */
#define LCD_LINE_CYCLES (456 + 4)
/** LCD characteristics **/
/* PPU cycles through modes every 456 cycles. */
#define LCD_LINE_CYCLES 456
/* Mode 0 starts on cycle 0. */
#define LCD_MODE_0_CYCLES 0
/* Mode 2 starts on cycle 204. */
#define LCD_MODE_2_CYCLES 204
/* Mode 3 starts on cycle 284. */
#define LCD_MODE_3_CYCLES 284
/* There are 154 scanlines. LY < 154. */
#define LCD_VERT_LINES 154
#define LCD_WIDTH 160
#define LCD_HEIGHT 144
@@ -787,7 +792,7 @@ uint8_t __gb_read(struct gb_s *gb, const uint16_t addr)
/* Return address that caused read error. */
(gb->gb_error)(gb, GB_INVALID_READ, addr);
PGB_UNREACHABLE();
// PGB_UNREACHABLE();
}
/**
@@ -1653,13 +1658,14 @@ void __gb_step_cpu(struct gb_s *gb)
/* If gb_halt is positive, then an interrupt must have occured by the
* time we reach here, becuase on HALT, we jump to the next interrupt
* immediately. */
if(gb->gb_halt || (gb->gb_ime &&
while(gb->gb_halt || (gb->gb_ime &&
gb->hram_io[IO_IF] & gb->hram_io[IO_IE] & ANY_INTR))
{
gb->gb_halt = 0;
if(gb->gb_ime)
{
if(!gb->gb_ime)
break;
/* Disable interrupts */
gb->gb_ime = 0;
@@ -1693,7 +1699,8 @@ void __gb_step_cpu(struct gb_s *gb)
gb->cpu_reg.pc.reg = CONTROL_INTR_ADDR;
gb->hram_io[IO_IF] ^= CONTROL_INTR;
}
}
break;
}
/* Obtain opcode */
@@ -2348,7 +2355,7 @@ void __gb_step_cpu(struct gb_s *gb)
/* This may be intentional, but this is required to stop an infinite
* loop. */
(gb->gb_error)(gb, GB_HALT_FOREVER, gb->cpu_reg.pc.reg - 1);
PGB_UNREACHABLE();
// PGB_UNREACHABLE();
}
if(gb->hram_io[IO_SC] & SERIAL_SC_TX_START)
@@ -3146,16 +3153,15 @@ void __gb_step_cpu(struct gb_s *gb)
break;
default:
/* Return address where invlid opcode that was read. */
/* Return address where invalid opcode that was read. */
(gb->gb_error)(gb, GB_INVALID_OPCODE, gb->cpu_reg.pc.reg - 1);
PGB_UNREACHABLE();
// PGB_UNREACHABLE();
}
do
{
/* DIV register timing */
gb->counter.div_count += inst_cycles;
while(gb->counter.div_count >= DIV_CYCLES)
{
gb->hram_io[IO_DIV]++;
@@ -3246,6 +3252,9 @@ void __gb_step_cpu(struct gb_s *gb)
{
gb->counter.lcd_count -= LCD_LINE_CYCLES;
/* Next line */
gb->hram_io[IO_LY] = (gb->hram_io[IO_LY] + 1) % LCD_VERT_LINES;
/* LYC Update */
if(gb->hram_io[IO_LY] == gb->hram_io[IO_LYC])
{
@@ -3257,9 +3266,6 @@ void __gb_step_cpu(struct gb_s *gb)
else
gb->hram_io[IO_STAT] &= 0xFB;
/* Next line */
gb->hram_io[IO_LY] = (gb->hram_io[IO_LY] + 1) % LCD_VERT_LINES;
/* VBLANK Start */
if(gb->hram_io[IO_LY] == LCD_HEIGHT)
{