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cd: gfx: reduce LUT size

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This commit is contained in:
notaz 2013-09-22 04:35:55 +03:00
parent a93a80deda
commit f3cb39f29a
1 changed files with 15 additions and 10 deletions
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25
pico/cd/gfx.c
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@ -50,7 +50,7 @@ typedef struct
uint16 bufferOffset; /* image buffer column offset */
uint32 bufferStart; /* image buffer start index */
uint32 y_step; /* pico: render line step */
uint8 lut_prio[4][0x100][0x100]; /* WORD-RAM data writes priority lookup table */
uint8 lut_prio[4][0x10][0x10]; /* WORD-RAM data writes priority lookup table */
uint8 lut_pixel[0x200]; /* Graphics operation dot offset lookup table */
uint8 lut_cell[0x100]; /* Graphics operation stamp offset lookup table */
} gfx_t;
@ -71,16 +71,16 @@ void gfx_init(void)
memset(&gfx, 0, sizeof(gfx));
/* Initialize priority modes lookup table */
for (i=0; i<0x100; i++)
for (i = 0; i < 0x10; i++)
{
for (j=0; j<0x100; j++)
for (j = 0; j < 0x10; j++)
{
/* normal */
gfx.lut_prio[0][i][j] = j;
/* underwrite */
gfx.lut_prio[1][i][j] = ((i & 0x0f) ? (i & 0x0f) : (j & 0x0f)) | ((i & 0xf0) ? (i & 0xf0) : (j & 0xf0));
gfx.lut_prio[1][i][j] = i ? i : j;
/* overwrite */
gfx.lut_prio[2][i][j] = ((j & 0x0f) ? (j & 0x0f) : (i & 0x0f)) | ((j & 0xf0) ? (j & 0xf0) : (i & 0xf0));
gfx.lut_prio[2][i][j] = j ? j : i;
/* invalid */
gfx.lut_prio[3][i][j] = i;
}
@ -180,7 +180,7 @@ static void gfx_render(uint32 bufferIndex, uint32 width)
uint8 pixel_in, pixel_out;
uint16 stamp_data;
uint32 stamp_index;
uint32 reg;
uint32 priority;
/* pixel map start position for current line (13.3 format converted to 13.11) */
uint32 xpos = *gfx.tracePtr++ << 8;
@ -190,6 +190,9 @@ static void gfx_render(uint32 bufferIndex, uint32 width)
uint32 xoffset = (int16) *gfx.tracePtr++;
uint32 yoffset = (int16) *gfx.tracePtr++;
priority = (Pico_mcd->s68k_regs[2] << 8) | Pico_mcd->s68k_regs[3];
priority = (priority >> 3) & 0x03;
/* process all dots */
while (width--)
{
@ -274,17 +277,19 @@ static void gfx_render(uint32 bufferIndex, uint32 width)
/* update left or rigth pixel */
if (bufferIndex & 1)
{
/* priority mode write */
pixel_out = gfx.lut_prio[priority][pixel_in & 0x0f][pixel_out];
pixel_out |= (pixel_in & 0xf0);
}
else
{
/* priority mode write */
pixel_out = gfx.lut_prio[priority][pixel_in >> 4][pixel_out];
pixel_out = (pixel_out << 4) | (pixel_in & 0x0f);
}
/* priority mode write */
reg = (Pico_mcd->s68k_regs[2] << 8) | Pico_mcd->s68k_regs[3];
pixel_out = gfx.lut_prio[(reg >> 3) & 0x03][pixel_in][pixel_out];
/* write data to image buffer */
WRITE_BYTE(Pico_mcd->word_ram2M, bufferIndex >> 1, pixel_out);