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ppu: unite 1bpp and 2bpp into one - ppu_blit

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This commit is contained in:
Sigrid Solveig Haflínudóttir 2021-12-25 13:50:34 +01:00
parent b2bb585e1d
commit 927fdb497f
3 changed files with 16 additions and 37 deletions
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38
src/devices/ppu.c
View file

@ -91,7 +91,7 @@ void
ppu_write(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
{
if(x < p->width && y < p->height) {
Uint32 i = (x + y * p->width);
Uint32 i = x + y * p->width;
Uint8 prev = layer->pixels[i];
if(color != prev) {
layer->pixels[i] = color;
@ -101,30 +101,14 @@ ppu_write(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
}
void
ppu_1bpp(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy)
ppu_blit(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy, Uint8 twobpp)
{
Uint16 v, h;
for(v = 0; v < 8; ++v)
for(h = 0; h < 8; ++h) {
Uint8 ch1 = (sprite[v] >> (7 - h)) & 0x1;
if(ch1 || blending[4][color])
ppu_write(p,
layer,
x + (flipx ? 7 - h : h),
y + (flipy ? 7 - v : v),
blending[ch1][color]);
}
}
void
ppu_2bpp(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy)
{
Uint16 v, h;
for(v = 0; v < 8; ++v)
for(h = 0; h < 8; ++h) {
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1);
Uint8 ch2 = ((sprite[v + 8] >> (7 - h)) & 0x1);
Uint8 ch = ch1 + ch2 * 2;
Uint8 ch = (sprite[v + 0] >> (7 - h)) & 0x1;
if(twobpp)
ch |= ((sprite[v + 8] >> (7 - h)) & 0x1) << 1;
if(ch || blending[4][color])
ppu_write(p,
layer,
@ -141,17 +125,17 @@ ppu_debug(Ppu *p, Uint8 *stack, Uint8 wptr, Uint8 rptr, Uint8 *memory)
for(i = 0; i < 0x20; ++i) {
x = ((i % 8) * 3 + 1) * 8, y = (i / 8 + 1) * 8, b = stack[i];
/* working stack */
ppu_1bpp(p, &p->fg, x, y, font[(b >> 4) & 0xf], 1 + (wptr == i) * 0x7, 0, 0);
ppu_1bpp(p, &p->fg, x + 8, y, font[b & 0xf], 1 + (wptr == i) * 0x7, 0, 0);
ppu_blit(p, &p->fg, x, y, font[(b >> 4) & 0xf], 1 + (wptr == i) * 0x7, 0, 0, 0);
ppu_blit(p, &p->fg, x + 8, y, font[b & 0xf], 1 + (wptr == i) * 0x7, 0, 0, 0);
y = 0x28 + (i / 8 + 1) * 8;
b = memory[i];
/* return stack */
ppu_1bpp(p, &p->fg, x, y, font[(b >> 4) & 0xf], 3, 0, 0);
ppu_1bpp(p, &p->fg, x + 8, y, font[b & 0xf], 3, 0, 0);
ppu_blit(p, &p->fg, x, y, font[(b >> 4) & 0xf], 3, 0, 0, 0);
ppu_blit(p, &p->fg, x + 8, y, font[b & 0xf], 3, 0, 0, 0);
}
/* return pointer */
ppu_1bpp(p, &p->fg, 0x8, y + 0x10, font[(rptr >> 4) & 0xf], 0x2, 0, 0);
ppu_1bpp(p, &p->fg, 0x10, y + 0x10, font[rptr & 0xf], 0x2, 0, 0);
ppu_blit(p, &p->fg, 0x8, y + 0x10, font[(rptr >> 4) & 0xf], 0x2, 0, 0, 0);
ppu_blit(p, &p->fg, 0x10, y + 0x10, font[rptr & 0xf], 0x2, 0, 0, 0);
/* guides */
for(x = 0; x < 0x10; ++x) {
ppu_write(p, &p->fg, x, p->height / 2, 2);

3
src/devices/ppu.h
View file

@ -37,6 +37,5 @@ void ppu_clear(Ppu *p, Layer *layer);
void ppu_redraw(Ppu *p, Uint32 *screen);
void ppu_write(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color);
void ppu_1bpp(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy);
void ppu_2bpp(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy);
void ppu_blit(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy, Uint8 twobpp);
void ppu_debug(Ppu *p, Uint8 *stack, Uint8 wptr, Uint8 rptr, Uint8 *memory);

12
src/uxnemu.c
View file

@ -299,15 +299,11 @@ screen_deo(Device *d, Uint8 port)
case 0xf: {
Uint16 x = peek16(d->dat, 0x8);
Uint16 y = peek16(d->dat, 0xa);
Uint8 layer = d->dat[0xf] & 0x40;
Layer *layer = (d->dat[0xf] & 0x40) ? &ppu.fg : &ppu.bg;
Uint8 *addr = &d->mem[peek16(d->dat, 0xc)];
if(d->dat[0xf] & 0x80) {
ppu_2bpp(&ppu, layer ? &ppu.fg : &ppu.bg, x, y, addr, d->dat[0xf] & 0xf, d->dat[0xf] & 0x10, d->dat[0xf] & 0x20);
if(d->dat[0x6] & 0x04) poke16(d->dat, 0xc, peek16(d->dat, 0xc) + 16); /* auto addr+16 */
} else {
ppu_1bpp(&ppu, layer ? &ppu.fg : &ppu.bg, x, y, addr, d->dat[0xf] & 0xf, d->dat[0xf] & 0x10, d->dat[0xf] & 0x20);
if(d->dat[0x6] & 0x04) poke16(d->dat, 0xc, peek16(d->dat, 0xc) + 8); /* auto addr+8 */
}
Uint8 twobpp = !!(d->dat[0xf] & 0x80);
ppu_blit(&ppu, layer, x, y, addr, d->dat[0xf] & 0xf, d->dat[0xf] & 0x10, d->dat[0xf] & 0x20, twobpp);
if(d->dat[0x6] & 0x04) poke16(d->dat, 0xc, peek16(d->dat, 0xc) + 8 + twobpp*8); /* auto addr+8 / auto addr+16 */
if(d->dat[0x6] & 0x01) poke16(d->dat, 0x8, x + 8); /* auto x+8 */
if(d->dat[0x6] & 0x02) poke16(d->dat, 0xa, y + 8); /* auto y+8 */
break;