added more comments, removed the suspicious(and false) color shifting, fixed typo/naming prob from 1.31
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@ -414,8 +414,12 @@ void GPU_setBGProp(GPU * gpu, u16 num, u16 p)
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return;
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}*/
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gpu->BGSize[num][0] = sizeTab[mode2type[gpu->dispMode][num]][BGCNT_SCREENSIZE(p)][0];
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gpu->BGSize[num][1] = sizeTab[mode2type[gpu->dispMode][num]][BGCNT_SCREENSIZE(p)][1];
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/* we got a naming problem here, dispMode actual is _DISPCNT_.ExMode */
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// gpu->BGSize[num][0] = sizeTab[mode2type[gpu->dispMode][num]][BGCNT_SCREENSIZE(p)][0];
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// gpu->BGSize[num][1] = sizeTab[mode2type[gpu->dispMode][num]][BGCNT_SCREENSIZE(p)][1];
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gpu->BGSize[num][0] = sizeTab[mode2type[((_DISPCNT_*)(&(gpu->prop)))->DisplayMode][num]][BGCNT_SCREENSIZE(p)][0];
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gpu->BGSize[num][1] = sizeTab[mode2type[((_DISPCNT_*)(&(gpu->prop)))->DisplayMode][num]][BGCNT_SCREENSIZE(p)][1];
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}
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void GPU_remove(GPU * gpu, u8 num)
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@ -1002,7 +1006,7 @@ void sprite1D(GPU * gpu, u16 l, u8 * dst, u8 * prioTab)
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u8 block = gpu->sprBlock;
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u16 i;
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for(i = 0; i<nbShow; ++i, --spriteInfo)
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for(i = 0; i<nbShow; ++i, --spriteInfo) /* check all sprites */
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{
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s32 sprX;
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s32 sprY;
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@ -1015,7 +1019,7 @@ void sprite1D(GPU * gpu, u16 l, u8 * dst, u8 * prioTab)
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u8 * pal;
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u16 j;
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sprX = (spriteInfo->X<<23)>>23;
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sprX = (spriteInfo->X<<23)>>23; /* get sprite location and size */
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sprY = spriteInfo->Y;
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sprSize = sprSizeTab[spriteInfo->Size][spriteInfo->Shape];
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@ -1024,49 +1028,58 @@ void sprite1D(GPU * gpu, u16 l, u8 * dst, u8 * prioTab)
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if(sprY>192)
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sprY = (s32)((s8)(spriteInfo->Y));
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if( (spriteInfo->RotScale == 2) ||
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(l<sprY)||(l>=sprY+sprSize.y) ||
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(sprX==256) )
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continue;
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/* FIXME: for rot/scale, a list of entries into the sprite should be maintained, that tells us where the first pixel */
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/* of a screenline starts in the sprite, and how a step to the right in a screenline translates within the sprite */
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/* CHECKME: if H-flipped, are the clippings meet? What happens if x direction is flipped, is the range checking working? */
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if( (spriteInfo->RotScale == 2) || /* rotscale == 2 => sprite disabled */
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(l<sprY)||(l>=sprY+sprSize.y) || /* sprite occupies only lines outside the current drawn line */
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(sprX==256) ) /* sprite is outside our line */
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continue; /* for all these problems, continue with the next sprite */
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if(sprX<0)
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if(sprX<0) /* when sprite start is left of the screen */
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{
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if(sprX+sprSize.x<=0) continue;
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lg += sprX;
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x = -sprX;
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sprX = 0;
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} else if(sprX+sprSize.x>256)
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lg = 255 - sprX;
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if(sprX+sprSize.x<=0) continue; /* and the end also, continue with the next sprite */
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lg += sprX; /* reduce the points pixels to draw by the amount we are left of screen */
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x = -sprX; /* we start later in the sprite then */
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sprX = 0; /* but at the lines #0 pixel */
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} else if(sprX+sprSize.x>256) /* if we would move over the right border */
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lg = 255 - sprX; /* simply limit drawing to the number of pixels left till mostright visible pixel */
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y = l - sprY;
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y = l - sprY; /* get the y line within sprite coords */
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prio = spriteInfo->Priority;
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if (spriteInfo->VFlip)
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if (spriteInfo->VFlip) /* if Vflip, we start from the other side with the sprite */
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y = sprSize.y - y -1;
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if (spriteInfo->Mode == 3)
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if (spriteInfo->Mode == 3) /* sprite is in BMP format */
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{
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u16 i;
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/* sprMemory + sprBlock + 16Bytes per line (8pixels a 2 bytes) */
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src = (gpu->sprMem) + (spriteInfo->TileIndex<<4) + (y<<gpu->sprBMPBlock);
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if (spriteInfo->HFlip)
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if (spriteInfo->HFlip) /* if h-flip */
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{
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x = sprSize.x -x - 1;
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x = sprSize.x -x - 1; /* start at the end of the sprite */
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for(i = 0; i < lg; ++i, --x, ++sprX)
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{
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u8 c = src[x];
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u8 c = src[x]; /* color of the sprites pixel */
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// What's the point in shifting down by 15 when c is 8-bits?
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RENDERS_A(c>>15)
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// RENDERS_A(c>>15)
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/* if i understand it correct, and it fixes some sprite problems in chameleon shot */
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/* we have a 15 bit color, and should use the pal entry bits as alpha ?*/
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/* http://nocash.emubase.de/gbatek.htm#dsvideoobjs */
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RENDERS_A(c) ; /* FIXME: apply additional alpha */
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}
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continue;
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}
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for(i = 0; i < lg; ++i, ++x, ++sprX)
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for(i = 0; i < lg; ++i, ++x, ++sprX)/* otherwise we start from the beginning of the sprite */
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{
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u16 c = T1ReadWord(src, x << 1);
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RENDERS_A(c>>15)
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u16 c = T1ReadWord(src, x << 1);/* CHECKME: do we need the endian conversation? if yes, change the one above also */
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// RENDERS_A(c>>15)
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RENDERS_A(c) ;
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}
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continue;
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continue; /* sprite drawing done, do next */
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}
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if(spriteInfo->Depth)
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