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[Core/VDP] fixed spurious 8K-16K VRAM switching when reloading SG-1000 context + minor optimizations

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This commit is contained in:
EkeEke 2016-02-28 22:42:19 +01:00
parent b1eb0641c6
commit f49980abed
5 changed files with 32 additions and 116 deletions
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146
core/vdp_ctrl.c
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@ -5,7 +5,7 @@
* Support for SG-1000 (TMS99xx & 315-5066), Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2015 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -180,6 +180,26 @@ static void (*const dma_func[16])(unsigned int length) =
vdp_dma_copy,vdp_dma_copy,vdp_dma_copy,vdp_dma_copy
};
/* BG rendering functions */
static void (*const render_bg_modes[16])(int line) =
{
render_bg_m0, /* Graphics I */
render_bg_m2, /* Graphics II */
render_bg_m4, /* Mode 4 */
render_bg_m4, /* Mode 4 */
render_bg_m3, /* Multicolor */
render_bg_m3x, /* Multicolor (Extended PG) */
render_bg_m4, /* Mode 4 */
render_bg_m4, /* Mode 4 */
render_bg_m1, /* Text */
render_bg_m1x, /* Text (Extended PG) */
render_bg_m4, /* Mode 4 */
render_bg_m4, /* Mode 4 */
render_bg_inv, /* Invalid (1+3) */
render_bg_inv, /* Invalid (1+2+3) */
render_bg_m4, /* Mode 4 */
render_bg_m4, /* Mode 4 */
};
/*--------------------------------------------------------------------------*/
/* Init, reset, context functions */
@ -451,12 +471,14 @@ int vdp_context_load(uint8 *state)
}
else
{
/* TMS-99xx registers are updated directly to prevent spurious 4K->16K VRAM switching */
for (i=0;i<0x08;i++)
{
pending = 1;
addr_latch = temp_reg[i];
vdp_tms_ctrl_w(0x80 | i);
reg[i] = temp_reg[i];
}
/* Rendering mode */
render_bg = render_bg_modes[((reg[0] & 0x02) | (reg[1] & 0x18)) >> 1];
}
}
else
@ -517,7 +539,7 @@ int vdp_context_load(uint8 *state)
color_update_m4(0x40, *(uint16 *)&cram[(0x10 | (border & 0x0F)) << 1]);
}
/* invalidate cache */
/* invalidate tile cache */
for (i=0;i<bg_list_index;i++)
{
bg_name_list[i]=i;
@ -534,7 +556,7 @@ int vdp_context_load(uint8 *state)
void vdp_dma_update(unsigned int cycles)
{
int dma_cycles, dma_bytes;
unsigned int dma_cycles, dma_bytes;
/* DMA transfer rate (bytes per line)
@ -619,7 +641,7 @@ void vdp_dma_update(unsigned int cycles)
}
/* Process DMA */
if (dma_bytes > 0)
if (dma_bytes)
{
/* Update DMA length */
dma_length -= dma_bytes;
@ -1006,62 +1028,7 @@ void vdp_sms_ctrl_w(unsigned int data)
}
/* Rendering mode */
switch (mode)
{
case 0x00: /* Graphics I */
{
render_bg = render_bg_m0;
break;
}
case 0x10: /* Text */
{
render_bg = render_bg_m1;
break;
}
case 0x02: /* Graphics II */
{
render_bg = render_bg_m2;
break;
}
case 0x12: /* Text (Extended PG) */
{
render_bg = render_bg_m1x;
break;
}
case 0x08: /* Multicolor */
{
render_bg = render_bg_m3;
break;
}
case 0x18: /* Invalid (1+3) */
{
render_bg = render_bg_inv;
break;
}
case 0x0A: /* Multicolor (Extended PG) */
{
render_bg = render_bg_m3x;
break;
}
case 0x1A: /* Invalid (1+2+3) */
{
render_bg = render_bg_inv;
break;
}
default: /* Mode 4 */
{
render_bg = render_bg_m4;
break;
}
}
render_bg = render_bg_modes[mode>>1];
/* Mode switching */
if (prev & 0x04)
@ -1140,59 +1107,8 @@ void vdp_tms_ctrl_w(unsigned int data)
/* Check VDP mode changes */
if (data < 2)
{
int mode = (reg[0] & 0x02) | (reg[1] & 0x18);
/* Rendering mode */
switch (mode)
{
case 0x00: /* Graphics I */
{
render_bg = render_bg_m0;
break;
}
case 0x10: /* Text */
{
render_bg = render_bg_m1;
break;
}
case 0x02: /* Graphics II */
{
render_bg = render_bg_m2;
break;
}
case 0x12: /* Text (Extended PG) */
{
render_bg = render_bg_m1x;
break;
}
case 0x08: /* Multicolor */
{
render_bg = render_bg_m3;
break;
}
case 0x18: /* Invalid (1+3) */
{
render_bg = render_bg_inv;
break;
}
case 0x0A: /* Multicolor (Extended PG) */
{
render_bg = render_bg_m3x;
break;
}
case 0x1A: /* Invalid (1+2+3) */
{
render_bg = render_bg_inv;
break;
}
}
render_bg = render_bg_modes[((reg[0] & 0x02) | (reg[1] & 0x18)) >> 1];
}
}
}

2
core/vdp_ctrl.h
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@ -5,7 +5,7 @@
* Support for SG-1000 (TMS99xx & 315-5066), Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2015 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: