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Improve reduce_bit_depth_sp

This commit is contained in:
Lorenzooone 2019-09-24 23:11:43 +02:00
parent 4624911fa3
commit c00039cb18
1 changed files with 63 additions and 13 deletions
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76
src/c/vwf.c
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@ -70,9 +70,14 @@ byte reduce_bit_depth(int row, int foregroundRow)
}
//The order is swapped in order to make this faster
//Doing the bottom tile directly saves some cycles
void reduce_bit_depth_sp(int* TileRows, int* bufferValues)
{
int* bottomTileRows = TileRows + (0x20 * 8);
int* bottomBufferValues = bufferValues + 0x40;
const int foregroundRow = 0xFFFFFFFF;
//First value
unsigned int firstRow = *(TileRows++);
unsigned int secondRow = *(TileRows++);
unsigned int thirdRow = *(TileRows++);
@ -127,6 +132,62 @@ void reduce_bit_depth_sp(int* TileRows, int* bufferValues)
value <<= 4;
value |= m2_nybbles_to_bits[firstRow & 0xFFFF];
*(bufferValues) = value;
//First value of bottom tile
firstRow = *(bottomTileRows++);
secondRow = *(bottomTileRows++);
thirdRow = *(bottomTileRows++);
fourthRow = *(bottomTileRows++);
firstRow ^= foregroundRow;
secondRow ^= foregroundRow;
thirdRow ^= foregroundRow;
fourthRow ^= foregroundRow;
value = m2_nybbles_to_bits[(fourthRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[fourthRow & 0xFFFF];
value <<= 4;
value |= m2_nybbles_to_bits[(thirdRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[thirdRow & 0xFFFF];
value <<= 4;
value |= m2_nybbles_to_bits[(secondRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[secondRow & 0xFFFF];
value <<= 4;
value |= m2_nybbles_to_bits[(firstRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[firstRow & 0xFFFF];
*(bottomBufferValues++) = value;
//Second value of bottom tile
firstRow = *(bottomTileRows++);
secondRow = *(bottomTileRows++);
thirdRow = *(bottomTileRows++);
fourthRow = *(bottomTileRows);
firstRow ^= foregroundRow;
secondRow ^= foregroundRow;
thirdRow ^= foregroundRow;
fourthRow ^= foregroundRow;
value = m2_nybbles_to_bits[(fourthRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[fourthRow & 0xFFFF];
value <<= 4;
value |= m2_nybbles_to_bits[(thirdRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[thirdRow & 0xFFFF];
value <<= 4;
value |= m2_nybbles_to_bits[(secondRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[secondRow & 0xFFFF];
value <<= 4;
value |= m2_nybbles_to_bits[(firstRow >> 16)];
value <<= 4;
value |= m2_nybbles_to_bits[firstRow & 0xFFFF];
*(bottomBufferValues) = value;
}
byte getSex(byte character)
@ -1950,48 +2011,37 @@ void load_pixels_overworld_buffer()
int tile = *tile_offset;
byte* buffer = (byte*)(OVERWORLD_BUFFER - (tile * TILESET_OFFSET_BUFFER_MULTIPLIER));
int* topBufferValues = (int*)(&buffer[tile * 8]);
int* bottomBufferValues = topBufferValues + 0x40;
int* topTilePointer;
int* bottomTilePointer;
int nextValue = 0x20;
int i = 0;
while(i < (0x1C * 8))
{
//Using pointers instead of values directly saves another 14k cycles. The total amount of cycles this routine now takes is about 151k
//Using pointers instead of values directly saves another 14k cycles. The total amount of cycles this routine now takes is about 148k
tile = m2_coord_table_fast_progression[i];
int remainingTiles = tile >> 0xB;
tile = (tile & 0x7FF) + (*tile_offset);
topTilePointer = &vram[(tile * 8)];
bottomTilePointer = topTilePointer + (0x20 * 8);
if(i == nextValue)
{
nextValue += 0x20;
topBufferValues += 0x40;
bottomBufferValues += 0x40;
}
i++;
//Using "reduce_bit_depth_sp" reduced the total amount of cycles from 300k to 165k
//Using "reduce_bit_depth_sp" reduced the total amount of cycles from 300k to 162k
reduce_bit_depth_sp(topTilePointer, topBufferValues);
topTilePointer += 8;
topBufferValues += 2;
reduce_bit_depth_sp(bottomTilePointer, bottomBufferValues);
bottomTilePointer += 8;
bottomBufferValues += 2;
while(remainingTiles > 0)
{
if(i == nextValue)
{
nextValue += 0x20;
topBufferValues += 0x40;
bottomBufferValues += 0x40;
}
i++;
reduce_bit_depth_sp(topTilePointer, topBufferValues);
topTilePointer += 8;
topBufferValues += 2;
reduce_bit_depth_sp(bottomTilePointer, bottomBufferValues);
bottomTilePointer += 8;
bottomBufferValues += 2;
remainingTiles--;
}
}