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update to new upkr version, use css to scale canvas

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This commit is contained in:
Dennis Ranke
2021-11-24 22:51:27 +01:00
parent 88bc4fe364
commit fcf24110c5
9 changed files with 42 additions and 46 deletions
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47
platform/src/loader.cwa
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@@ -10,8 +10,6 @@ export fn load_uw8(module_size: i32) -> i32 {
let module_end = 0x1e000 + module_size;
if version & 1 {
module_size?0 = 0;
module_size?1 = 0;
module_end = uncompress(1, 0x1e001);
} else {
copy(0x1e000, 0, module_size);
@@ -76,17 +74,13 @@ fn copy(dest: i32, src: i32, len: i32) {
// upkr unpacker
global mut upkr_src_ptr: i32 = 0;
global mut upkr_code: i64 = 0i64;
global mut upkr_low: i64 = 0i64;
global mut upkr_range: i64 = 0i64;
global mut upkr_state: i32 = 0;
// uncompress upkr compressed data at `src` into the buffer at `dest`
// returns the end of the uncompressed data
export fn uncompress(src_ptr: i32, dest_ptr: i32) -> i32 {
upkr_src_ptr = src_ptr;
upkr_code = 0i64;
upkr_low = 0i64;
upkr_range = 1i64;
upkr_state = 0;
let offset: i32;
@@ -94,7 +88,7 @@ export fn uncompress(src_ptr: i32, dest_ptr: i32) -> i32 {
let i: i32;
loop init_contexts {
i!0x3c000 = 0x8000;
i!0x3c000 = 0x800;
branch_if (i := i + 4) < (256 + 1 + 128) * 4: init_contexts
}
@@ -144,45 +138,32 @@ fn upkr_length(context_index: i32) -> i32 {
}
fn upkr_bit(context_index: i32) -> i32 {
let prob = ((context_index * 4)!0x3c000) as i64;
let prob = (context_index * 4)!0x3c000;
loop refill {
if upkr_low >> 32i64 == (upkr_low + upkr_range - 1i64) >> 32i64 {
upkr_append_byte();
if upkr_state < 1<<16 {
upkr_state = (upkr_state << 8) | ?upkr_src_ptr;
upkr_src_ptr = upkr_src_ptr + 1;
branch refill;
}
}
if upkr_range < (1i64 << 24i64) {
upkr_append_byte();
upkr_append_byte();
upkr_range = (1i64 << 40i64) - upkr_low;
}
let range = upkr_range / 65536i64;
let bit = (upkr_code - upkr_low) / range < prob;
let lazy state_low = upkr_state & 0xfff;
let bit = state_low < prob;
if bit {
upkr_range = range * prob;
prob = prob + (((1i64 << 16i64) - prob) >> 4i64);
upkr_state = prob * (upkr_state >> 12) + state_low;
prob = prob + ((0x1000 - prob) >> 4);
} else {
upkr_low = upkr_low + range * prob;
upkr_range = range * (65536i64 - prob);
prob = prob - (prob >> 4i64);
upkr_state = (0x1000 - prob) * (upkr_state >> 12) + state_low - prob;
prob = prob - (prob >> 4);
}
(context_index * 4)!0x3c000 = prob as i32;
(context_index * 4)!0x3c000 = prob;
bit
}
fn upkr_append_byte() {
upkr_code = ((upkr_code & i64.extend_i32_u(-1)) << 8i64) | (?upkr_src_ptr) as i64;
upkr_src_ptr = upkr_src_ptr + 1;
upkr_low = (upkr_low & i64.extend_i32_u(-1)) << 8i64;
upkr_range = upkr_range << 8i64;
}
start fn unpack_base() {
base_end = uncompress(0, 0x3c800);
}