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Move pixel blitting from single mem access to byte-level

This commit is contained in:
David Guillen Fandos 2023-08-01 01:20:29 +02:00
parent b4f394459d
commit cde8a90ff8
2 changed files with 12 additions and 17 deletions
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2
common.h
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@ -138,11 +138,9 @@ typedef u32 fixed8_24;
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define eswap16(value) __builtin_bswap16(value)
#define eswap32(value) __builtin_bswap32(value)
#define eswap64(value) __builtin_bswap64(value)
#else
#define eswap16(value) (value)
#define eswap32(value) (value)
#define eswap64(value) (value)
#endif
#define readaddress8(base, offset) eswap8( address8( base, offset))

27
video.cc
View File

@ -154,11 +154,10 @@ static inline void render_tile_Nbpp(u32 bg_comb, u32 px_comb,
if (is8bpp) {
// Each byte is a color, mapped to a palete. 8 bytes can be read as 64bit
u64 tilepix = eswap64(*(u64*)tile_ptr);
for (u32 i = start; i < end; i++, dest_ptr++) {
// Honor hflip by selecting bytes in the correct order
u32 sel = hflip ? (7-i) : i;
u8 pval = (tilepix >> (sel*8)) & 0xFF;
u8 pval = tile_ptr[sel];
// Alhpa mode stacks previous value (unless rendering the first layer)
if (pval) {
if (rdtype == FULLCOLOR)
@ -180,18 +179,17 @@ static inline void render_tile_Nbpp(u32 bg_comb, u32 px_comb,
// In 4bpp mode, the tile[15..12] bits contain the sub-palette number.
u16 tilepal = (tile >> 12) << 4;
// Only 32 bits (8 pixels * 4 bits)
u32 tilepix = eswap32(*(u32*)tile_ptr);
for (u32 i = start; i < end; i++, dest_ptr++) {
u32 sel = hflip ? (7-i) : i;
u8 pval = (tilepix >> (sel*4)) & 0xF;
u32 selb = hflip ? (3-i/2) : i/2;
u32 seln = hflip ? ((i & 1) ^ 1) : (i & 1);
u8 pval = (tile_ptr[selb] >> (seln * 4)) & 0xF;
if (pval) {
u8 colidx = pval | tilepal;
if (rdtype == FULLCOLOR)
*dest_ptr = palette_ram_converted[colidx];
*dest_ptr = palette_ram_converted[tilepal | pval];
else if (rdtype == INDXCOLOR)
*dest_ptr = colidx | px_comb;
*dest_ptr = px_comb | tilepal | pval;
else if (rdtype == STCKCOLOR)
*dest_ptr = colidx | px_comb | ((isbase ? bg_comb : *dest_ptr) << 16); // Stack pixels
*dest_ptr = px_comb | tilepal | pval | ((isbase ? bg_comb : *dest_ptr) << 16); // Stack pixels
}
else if (isbase) {
if (rdtype == FULLCOLOR)
@ -677,12 +675,11 @@ static inline void render_obj_tile_Nbpp(u32 px_comb,
const u8* tile_ptr = &vram[0x10000 + (tile_offset & 0x7FFF)];
if (is8bpp) {
// Each byte is a color, mapped to a palete. 8 bytes can be read as 64bit
u64 tilepix = eswap64(*(u64*)tile_ptr);
// Each byte is a color, mapped to a palete.
for (u32 i = start; i < end; i++, dest_ptr++) {
// Honor hflip by selecting bytes in the correct order
u32 sel = hflip ? (7-i) : i;
u8 pval = (tilepix >> (sel*8)) & 0xFF;
u8 pval = tile_ptr[sel];
// Alhpa mode stacks previous value
if (pval) {
if (rdtype == FULLCOLOR)
@ -703,10 +700,10 @@ static inline void render_obj_tile_Nbpp(u32 px_comb,
}
} else {
// Only 32 bits (8 pixels * 4 bits)
u32 tilepix = eswap32(*(u32*)tile_ptr);
for (u32 i = start; i < end; i++, dest_ptr++) {
u32 sel = hflip ? (7-i) : i;
u8 pval = (tilepix >> (sel*4)) & 0xF;
u32 selb = hflip ? (3-i/2) : i/2;
u32 seln = hflip ? ((i & 1) ^ 1) : (i & 1);
u8 pval = (tile_ptr[selb] >> (seln * 4)) & 0xF;
if (pval) {
u8 colidx = pval | palette;
if (rdtype == FULLCOLOR)