private final void realSpriteZeroRendering(final int layer) {
for (int x = 0; x < 8; x++) {
if (layer == 0) {
// behind sprites for sprite #0
frameManager.setPixelLayer0(
(sprite.paletteUpperBitsColor << 2) | tile[x][lineToRender], sprite.xCoordinate + x, y);
colorIndex =
ppu.vram.readUnhandled(
VideoMemoryMap.SPR_PALLETE_START
+ frameManager.getPixelLayer0At(sprite.xCoordinate + x, y));
} else {
// front sprites for sprite #0
frameManager.setPixelLayer2(
(sprite.paletteUpperBitsColor << 2) | tile[x][lineToRender], sprite.xCoordinate + x, y);
colorIndex =
ppu.vram.readUnhandled(
VideoMemoryMap.SPR_PALLETE_START
+ frameManager.getPixelLayer2At(sprite.xCoordinate + x, y));
}
// just rendering when the colour isn't the transparency one!
if (colorIndex != ppu.vram.readUnhandled(VideoMemoryMap.SPR_PALLETE_START)) {
frameManager.setPixel(NesPalette.getRGBAt(colorIndex), sprite.xCoordinate + x, y);
// The Sprite #0 Detection!
if (frameManager.getPixelLayer1At(sprite.xCoordinate + x, y) != 0) {
ppu.ppuStatus.sprite0Hit = 1;
}
}
}
}
private final void renderLayer1() {
// 1. Name table byte
// 2. Attribute table byte
// 3. Pattern table bitmap #0
// 4. Pattern table bitmap #1
// just render if it is enable!
if (ppu.ppuMask.backgroundRenderingEnable != 0) {
for (int pixel = 0; pixel < 256; pixel++) {
// int nametableAddress = ppu.pPUAddress.completeAddress & 0x7FF;
int tileIndex =
ppu.vram.read(
VideoMemoryMap.NAME_TABLE_0_START
+ (ppu.scrolling.tileY * 32 + ppu.scrolling.tileX));
int[][] bgTile = ppu.getTile(ppu.ppuControl.patternTableAddressBackground, tileIndex);
frameManager.setPixelLayer1(
bgTile[ppu.scrolling.loopyX][ppu.scrolling.fineY], pixel, ppu.actualScanLine);
colorIndex =
ppu.vram.readUnhandled(
VideoMemoryMap.BG_PALLETE_START
+ ((ppu.getUpper2BitColorFromAttributeTable(
VideoMemoryMap.NAME_TABLE_0_START, tileIndex)
<< 2)
| frameManager.getPixelLayer1At(pixel, ppu.actualScanLine)));
frameManager.setPixel(NesPalette.getRGBAt(colorIndex), pixel, ppu.actualScanLine);
/*frameManager.setPixel(new float[]{(float)Math.random(),(float)Math.random(),(float)Math.random()},
pixel, ppu.actualScanLine);*/
// fine controls what pixel to start to rendering (0-7) from the tile.
// when it reaches the 7 it will wrap to 0 and increase the tilex!-
if (ppu.scrolling.loopyX == 7) {
ppu.scrolling.tileX++;
if (ppu.scrolling.tileX > 31) {
ppu.scrolling.tileX &= 31;
ppu.scrolling.loopyT[10] =
~ppu.scrolling.loopyT[10] & 1; // flipping the low nametable bit.
}
}
// wrapping the finex...
ppu.scrolling.loopyX = (ppu.scrolling.loopyX + 1) & 7;
}
ppu.scrolling.fineY++; // always after a scanline the finey is increase.
settedTileYFrom2006 = (ppu.scrolling.tileY > 29); // checking it it was setted by $2006.
if (ppu.scrolling.fineY > 7) {
// when finey wraps to 0, the tiley is increased.
ppu.scrolling.fineY &= 7;
ppu.scrolling.tileY++;
}
if (ppu.scrolling.tileY > 29 && !settedTileYFrom2006) {
ppu.scrolling.tileY = 0;
ppu.scrolling.loopyT[11] =
~ppu.scrolling.loopyT[11] & 1; // flipping the high nametable bit.
} else if (ppu.scrolling.tileY > 29 && settedTileYFrom2006) {
ppu.scrolling.tileY = 0;
}
}
}
