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ppu: keep track of modified rows and only redraw those in drawppu

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Sigrid Solveig Haflínudóttir 2021-05-19 12:25:18 +00:00
parent b25e3e599d
commit 3c64c8c1a4
3 changed files with 25 additions and 12 deletions
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34
src/devices/ppu.c
View file

@ -41,13 +41,11 @@ readpixel(Uint8 *sprite, Uint8 h, Uint8 v)
void void
clear(Ppu *p) clear(Ppu *p)
{ {
int i, sz = p->height * p->width, rows = sz / 4; int sz = p->height * p->width, rows = sz / 4;
for(i = 0; i < sz; ++i) memset(p->output, p->colors[0], sz);
p->output[i] = p->colors[0]; memset(p->fg, 0, rows);
for(i = 0; i < rows; i++) { memset(p->bg, 0, rows);
p->fg[i] = 0; memset(p->up, 0xff, p->ver);
p->bg[i] = 0;
}
} }
void void
@ -66,9 +64,12 @@ putcolors(Ppu *p, Uint8 *addr)
void void
putpixel(Ppu *p, Uint8 *layer, Uint16 x, Uint16 y, Uint8 color) putpixel(Ppu *p, Uint8 *layer, Uint16 x, Uint16 y, Uint8 color)
{ {
Uint16 row = (y % 8) + ((x / 8 + y / 8 * p->hor) * 16), col = 7 - (x % 8); if(x >= p->hor * 8 || y >= p->ver * 8)
if(x >= p->hor * 8 || y >= p->ver * 8 || row > (p->hor * p->ver * 16) - 8)
return; return;
int row = (y % 8) + ((x / 8 + y / 8 * p->hor) * 16);
if(row > (p->hor * p->ver * 16) - 8)
return;
int col = 7 - (x % 8);
if(color == 0 || color == 2) if(color == 0 || color == 2)
layer[row] &= ~(1UL << col); layer[row] &= ~(1UL << col);
else else
@ -77,6 +78,8 @@ putpixel(Ppu *p, Uint8 *layer, Uint16 x, Uint16 y, Uint8 color)
layer[row + 8] &= ~(1UL << col); layer[row + 8] &= ~(1UL << col);
else else
layer[row + 8] |= 1UL << col; layer[row + 8] |= 1UL << col;
p->up[y / 8] |= 1<<(y % 8);
} }
void void
@ -143,18 +146,25 @@ void
drawppu(Ppu *p) drawppu(Ppu *p)
{ {
Uint16 x, y; Uint16 x, y;
for(y = 0; y < p->ver; ++y) for(y = 0; y < p->ver; ++y) {
if(p->up[y] == 0)
continue;
for(x = 0; x < p->hor; ++x) { for(x = 0; x < p->hor; ++x) {
Uint8 v, h; Uint8 v, h;
Uint16 key = (y * p->hor + x) * 16; Uint16 key = (y * p->hor + x) * 16;
for(v = 0; v < 8; v++) for(v = 0; v < 8; v++) {
if((p->up[y] & (1<<v)) == 0)
continue;
for(h = 0; h < 8; h++) { for(h = 0; h < 8; h++) {
Uint8 color = readpixel(&p->fg[key], h, v); Uint8 color = readpixel(&p->fg[key], h, v);
if(color == 0) if(color == 0)
color = readpixel(&p->bg[key], h, v); color = readpixel(&p->bg[key], h, v);
drawpixel(p, x * 8 + p->pad + 7 - h, y * 8 + p->pad + v, color); drawpixel(p, x * 8 + p->pad + 7 - h, y * 8 + p->pad + v, color);
} }
}
} }
p->up[y] = 0;
}
} }
int int
@ -171,6 +181,8 @@ initppu(Ppu *p, Uint8 hor, Uint8 ver, Uint8 pad)
return 0; return 0;
if(!(p->fg = malloc(p->width * p->height * sizeof(Uint8) / 4))) if(!(p->fg = malloc(p->width * p->height * sizeof(Uint8) / 4)))
return 0; return 0;
if(!(p->up = malloc(p->ver)))
return 0;
clear(p); clear(p);
return 1; return 1;
} }

2
src/devices/ppu.h
View file

@ -18,7 +18,7 @@ typedef unsigned short Uint16;
typedef unsigned int Uint32; typedef unsigned int Uint32;
typedef struct Ppu { typedef struct Ppu {
Uint8 *bg, *fg; Uint8 *bg, *fg, *up;
Uint16 hor, ver, pad, width, height; Uint16 hor, ver, pad, width, height;
Uint32 *output, colors[4]; Uint32 *output, colors[4];
} Ppu; } Ppu;

1
src/emulator.c
View file

@ -86,6 +86,7 @@ quit(void)
free(ppu.output); free(ppu.output);
free(ppu.fg); free(ppu.fg);
free(ppu.bg); free(ppu.bg);
free(ppu.up);
SDL_UnlockAudioDevice(audio_id); SDL_UnlockAudioDevice(audio_id);
SDL_DestroyTexture(gTexture); SDL_DestroyTexture(gTexture);
gTexture = NULL; gTexture = NULL;