Bedrock emulator and assembler for Windows and Linux https://code.benbridle.com/bedrock-pc/atom?h=v1.0.0-alpha2 2024-12-16T01:45:21Z 2024-12-16T01:45:21Z Ben Bridle ben@derelict.engineering 2024-12-16T01:45:21Z urn:sha1:58faa15a909fe849e7e14a26cca85baf40e7598a This includes a fix to prevent the cursor from being marked as inactive while at least one mouse button is still being held. 2024-12-16T00:45:47Z Ben Bridle ben@derelict.engineering 2024-12-16T00:45:22Z urn:sha1:87f8faba2fde2ac4cfa79dbb1f30907b6e48653c The metadata specification has changed to use '/' as the separator between the program name and program version in the name string, and each author line is now no longer followed by the year in which the author last contributed to the program. 2024-12-16T00:43:13Z Ben Bridle ben@derelict.engineering 2024-12-16T00:42:21Z urn:sha1:07fb107e2d0527545bcdbb47ace80551702a71b1 Because the program counter is incremented immediately after an instruction byte is loaded, the value of the program counter reported by a debug instruction was actually the address of the following byte. This made the SYM symbol name line in the debug output report the wrong symbol name in some situations. This was fixed by decrementing the value used. 2024-11-24T03:19:46Z Ben Bridle ben@derelict.engineering 2024-11-24T03:19:46Z urn:sha1:583c961c0158fd44817695225e06d07caa18657e When opening the previously-visited directory in the file device, the directory data is read from a cache, preventing the need to have it regenerated from scratch. The directory data includes the selected child, which meant that instead of child 0 being selected as per the specification, the previously-selected child was selected instead. To fix this, the child is deselected as the directory data is cached. 2024-11-19T21:43:40Z Ben Bridle ben@derelict.engineering 2024-11-19T21:43:32Z urn:sha1:b1dbae360b3ed8de5354ffc4677fb3ada1646cfa This was erroneously set to 0 from before the memory device was implemented. 2024-11-19T21:42:57Z Ben Bridle ben@derelict.engineering 2024-11-19T21:42:57Z urn:sha1:39dfe987cbd99f42d85ea1a0c7d5df866fe739e5 In programs where the same sprite is drawn many times repeatedly, a lot of time is saved by caching the transformed sprite data instead of having to recalculate it for every draw operation. No testing has been done on the efficiency improvements this offers, but it doesn't seem like it could have any downsides. 2024-11-12T21:55:32Z Ben Bridle ben@derelict.engineering 2024-11-12T21:55:09Z urn:sha1:2bc38ca471cfb37fb6f65740f7a9f0d374183dce Writing a value to the pointer and length ports wasn't working, because the cached write was never getting committed. 2024-11-12T21:54:26Z Ben Bridle ben@derelict.engineering 2024-11-12T21:53:52Z urn:sha1:5ca376b56c3a495c9772e546995485159da2e664 An overflow error was causing the line drawing method to loop forever any time a line of length 0x4000 (16384) or longer was drawn. The issue was occurring because both e1 and dx (or dy) would have a value of at least 0x4000, and so on lines 291/292 the sum would exceed 0x8000, the maximum value of an i16. The value would then wrap and break the assumptions of the line drawing algorithm, causing it to loop forever. This was fixed by increasing the size of the affected types. 2024-11-12T21:54:02Z Ben Bridle ben@derelict.engineering 2024-11-12T21:47:48Z urn:sha1:f40681a72956b36fd5b3dfa596c497935159a372 A copy-paste error made all vertical scroll events register instead as horizontal scroll events. 2024-11-04T00:06:41Z Ben Bridle ben@derelict.engineering 2024-11-04T00:06:36Z urn:sha1:81a6b0da7a507214a01dc3a4513d8b73525e4381 When determining whether or not to draw each pixel of a textured line or rectangle, the modulo-by-eight operation was being performed on a signed value, which was returning a negative value when the pixel being drawn was off-screen. When the negative value was then converted to an unsigned value, the result was close to usize::MAX, and was causing an out-of-bounds array access. To fix this, the value is converted to an unsigned value before taking the modulo.