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VEFontCache: got rid of elf hash using a "label" hash borrowed from the rad debugger

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There was an issue with uniqueness so I just decided to scrap it (no need to keep parity with the original there...)
This commit is contained in:
Edward R. Gonzalez 2024-06-17 01:23:37 -04:00
parent b1927a8461
commit 05ffaf432d
1 changed files with 2 additions and 19 deletions
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21
code/font/VEFontCache/VEFontCache.odin
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@ -109,7 +109,7 @@ font_glyph_lru_code :: #force_inline proc( font : FontID, glyph_index : Glyph )
return
}
font_key_from_label :: #force_inline proc( label : string ) -> u64 {
label_hash :: #force_inline proc( label : string ) -> u64 {
hash : u64
for str_byte in transmute([]byte) label {
hash = ((hash << 8) + hash) + u64(str_byte)
@ -686,26 +686,9 @@ reset_batch_codepoint_state :: proc( ctx : ^Context ) {
shape_text_cached :: proc( ctx : ^Context, font : FontID, text_utf8 : string ) -> ^ShapedText
{
ELFhash64 :: proc( hash : ^u64, ptr : ^( $Type), count : i32 = 1 )
{
x := u64(0)
bytes := transmute( [^]byte) ptr
for index : i32 = 0; index < i32( size_of(Type)) * count; index += 1 {
(hash^) = ((hash^) << 4 ) + u64(bytes[index])
x = (hash^) & 0xF000000000000000
if x != 0 {
(hash^) ~= (x >> 24)
}
(hash^) &= ~x
}
}
font := font
hash := cast(u64) 0x9f8e00d51d263c24;
ELFhash64( & hash, raw_data(transmute([]u8) text_utf8), cast(i32) len(text_utf8) )
ELFhash64( & hash, & font )
// hash := cast(u64) crc32( transmute([]u8) text_utf8 )
hash := label_hash( text_utf8 )
shape_cache := & ctx.shape_cache
state := & ctx.shape_cache.state