Do not overdraw
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765724d2af
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243c5866ac
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@ -41,17 +41,21 @@ ppu_set_size(Ppu *p, Uint16 width, Uint16 height)
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Uint8
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Uint8
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ppu_read(Ppu *p, Uint16 x, Uint16 y)
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ppu_read(Ppu *p, Uint16 x, Uint16 y)
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{
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{
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if(x < p->width && y < p->height) {
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Uint32 row = (x + y * p->width) / 0x2;
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Uint32 row = (x + y * p->width) / 0x2;
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Uint8 shift = !(x & 0x1) << 2;
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Uint8 shift = !(x & 0x1) << 2;
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Uint8 pix = p->pixels[row] >> shift;
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Uint8 pix = p->pixels[row] >> shift;
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if(pix & 0x0c)
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if(pix & 0x0c)
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pix = pix >> 2;
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pix = pix >> 2;
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return pix & 0x3;
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return pix & 0x3;
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}
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return 0x0;
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}
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}
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void
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void
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ppu_write(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 color)
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ppu_write(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 color)
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{
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{
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if(x < p->width && y < p->height) {
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Uint32 row = (x + y * p->width) / 0x2;
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Uint32 row = (x + y * p->width) / 0x2;
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Uint8 shift = (!(x & 0x1) << 2) + (layer << 1);
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Uint8 shift = (!(x & 0x1) << 2) + (layer << 1);
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Uint8 pix = p->pixels[row];
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Uint8 pix = p->pixels[row];
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@ -61,6 +65,7 @@ ppu_write(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 color)
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p->pixels[row] = pixnew;
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p->pixels[row] = pixnew;
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if(pix != pixnew)
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if(pix != pixnew)
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p->reqdraw = 1;
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p->reqdraw = 1;
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}
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}
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}
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void
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void
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