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Improve text blitting performance

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This commit is contained in:
David Guillen Fandos 2023-08-01 20:27:08 +02:00
parent cde8a90ff8
commit a42ebbbedc
1 changed files with 70 additions and 14 deletions
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84
video.cc
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@ -134,16 +134,16 @@ void video_reload_counters()
// Will process a full or partial tile (start and end within 0..8) and draw
// it in either 8 or 4 bpp mode. Honors vertical and horizontal flip.
// tile contains the tile info (contains tile index, flip bits, pal info)
// hflip causes the tile pixels lookup to be reversed (from MSB to LSB
// If isbase is not set, color 0 is interpreted as transparent, otherwise
// we are drawing the base layer, so palette[0] is used (backdrop).
template<typename dsttype, rendtype rdtype, bool is8bpp, bool isbase, bool hflip>
static inline void render_tile_Nbpp(u32 bg_comb, u32 px_comb,
static inline void render_part_tile_Nbpp(u32 bg_comb, u32 px_comb,
dsttype *dest_ptr, u32 start, u32 end, u16 tile,
const u8 *tile_base, int vertical_pixel_flip
) {
// tile contains the tile info (contains tile index, flip bits, pal info)
// hflip causes the tile pixels lookup to be reversed (from MSB to LSB
// If isbase is not set, color 0 is interpreted as transparent, otherwise
// we are drawing the base layer, so palette[0] is used (backdrop).
// Seek to the specified tile, using the tile number and size.
// tile_base already points to the right tile-line vertical offset
const u8 *tile_ptr = &tile_base[(tile & 0x3FF) * (is8bpp ? 64 : 32)];
@ -201,6 +201,62 @@ static inline void render_tile_Nbpp(u32 bg_comb, u32 px_comb,
}
}
// Same as above, but optimized for full tiles. Skip comments here.
template<typename dsttype, rendtype rdtype, bool is8bpp, bool isbase, bool hflip>
static inline void render_tile_Nbpp(
u32 bg_comb, u32 px_comb, dsttype *dest_ptr, u16 tile,
const u8 *tile_base, int vertical_pixel_flip
) {
const u8 *tile_ptr = &tile_base[(tile & 0x3FF) * (is8bpp ? 64 : 32)];
if (tile & 0x800)
tile_ptr += vertical_pixel_flip;
if (is8bpp) {
for (u32 j = 0; j < 2; j++) {
u32 tilepix = eswap32(((u32*)tile_ptr)[hflip ? 1-j : j]);
for (u32 i = 0; i < 4; i++, dest_ptr++) {
u8 pval = hflip ? (tilepix >> (24 - i*8)) : (tilepix >> (i*8));
if (pval) {
if (rdtype == FULLCOLOR)
*dest_ptr = palette_ram_converted[pval];
else if (rdtype == INDXCOLOR)
*dest_ptr = pval | px_comb; // Add combine flags
else if (rdtype == STCKCOLOR)
*dest_ptr = pval | px_comb | ((isbase ? bg_comb : *dest_ptr) << 16);
}
else if (isbase) {
if (rdtype == FULLCOLOR)
*dest_ptr = palette_ram_converted[0];
else
*dest_ptr = 0 | bg_comb; // Add combine flags
}
}
}
} else {
u16 tilepal = (tile >> 12) << 4;
u32 tilepix = eswap32(*(u32*)tile_ptr);
for (u32 i = 0; i < 8; i++, dest_ptr++) {
u8 pval = (hflip ? (tilepix >> ((7-i)*4)) : (tilepix >> (i*4))) & 0xF;
if (pval) {
if (rdtype == FULLCOLOR)
*dest_ptr = palette_ram_converted[tilepal | pval];
else if (rdtype == INDXCOLOR)
*dest_ptr = px_comb | tilepal | pval;
else if (rdtype == STCKCOLOR)
*dest_ptr = px_comb | tilepal | pval | ((isbase ? bg_comb : *dest_ptr) << 16); // Stack pixels
}
else if (isbase) {
if (rdtype == FULLCOLOR)
*dest_ptr = palette_ram_converted[0];
else
*dest_ptr = 0 | bg_comb;
}
}
}
}
template<typename stype, rendtype rdtype, bool isbase, bool is8bpp>
static void render_scanline_text(u32 layer,
u32 start, u32 end, void *scanline)
@ -286,10 +342,10 @@ static void render_scanline_text(u32 layer,
u16 tile = eswap16(*map_ptr++);
if (tile & 0x400) // Tile horizontal flip
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, true>(
render_part_tile_Nbpp<stype, rdtype, is8bpp, isbase, true>(
bg_comb, px_comb, dest_ptr, tile_hoff, stop, tile, tile_base, vflip_off);
else
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, false>(
render_part_tile_Nbpp<stype, rdtype, is8bpp, isbase, false>(
bg_comb, px_comb, dest_ptr, tile_hoff, stop, tile, tile_base, vflip_off);
dest_ptr += todraw;
@ -307,10 +363,10 @@ static void render_scanline_text(u32 layer,
u16 tile = eswap16(*map_ptr++);
if (tile & 0x400) // Tile horizontal flip
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, true>(
bg_comb, px_comb, &dest_ptr[i * 8], 0, 8, tile, tile_base, vflip_off);
bg_comb, px_comb, &dest_ptr[i * 8], tile, tile_base, vflip_off);
else
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, false>(
bg_comb, px_comb, &dest_ptr[i * 8], 0, 8, tile, tile_base, vflip_off);
bg_comb, px_comb, &dest_ptr[i * 8], tile, tile_base, vflip_off);
}
end -= todraw * 8;
@ -330,10 +386,10 @@ static void render_scanline_text(u32 layer,
u16 tile = eswap16(*map_ptr++);
if (tile & 0x400) // Tile horizontal flip
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, true>(
bg_comb, px_comb, &dest_ptr[i * 8], 0, 8, tile, tile_base, vflip_off);
bg_comb, px_comb, &dest_ptr[i * 8], tile, tile_base, vflip_off);
else
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, false>(
bg_comb, px_comb, &dest_ptr[i * 8], 0, 8, tile, tile_base, vflip_off);
bg_comb, px_comb, &dest_ptr[i * 8], tile, tile_base, vflip_off);
}
end -= todraw * 8;
@ -344,10 +400,10 @@ static void render_scanline_text(u32 layer,
if (end) {
u16 tile = eswap16(*map_ptr++);
if (tile & 0x400) // Tile horizontal flip
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, true>(
render_part_tile_Nbpp<stype, rdtype, is8bpp, isbase, true>(
bg_comb, px_comb, dest_ptr, 0, end, tile, tile_base, vflip_off);
else
render_tile_Nbpp<stype, rdtype, is8bpp, isbase, false>(
render_part_tile_Nbpp<stype, rdtype, is8bpp, isbase, false>(
bg_comb, px_comb, dest_ptr, 0, end, tile, tile_base, vflip_off);
}
}