snark13
c71e249a4e
First substantive commit: the entire Sprinter C compiler tree on top of
the bare README+gitignore initial commit.
What's in here:
bin/sprinter-cc — driver script invoking SDCC + linker + mkexe
libc/ — Sprinter-specific libc layer over ESTEX/BIOS
(conio, gfx, io, mem, stdio + headers)
runtime/ — crt0 variants (default/small/banked/minimal)
+ heap + bank trampolines
toolchain/ — mkexe (SprintEXE packer, C + tests)
examples/ — 30 demo programs (gfx, file I/O, env, time, …)
lib/Makefile — builds the libc archive (sprinter.lib)
docs/ — converted Sprinter manuals + asm reference samples
third_party/ — solid-c reference compiler dump + sdcc setup script
release_docs/ — packaging / release notes
gitignore overhaul:
• Drop dangerous blanket patterns: *.asm (would hide docs/samples/*.asm)
and *.exe (case-insensitive match was hiding third_party/solid-c/*.EXE
on macOS APFS). Replaced with examples/*/*.{asm,exe,…} and lib/*.lib.
• Restore tracking of toolchain/mkexe/tests/{one,big}.bin — those are
INPUT fixtures, not build outputs.
• Collapse the duplicated SDCC/C/Sdcc sections into one section per
concern (build outputs / vendored / OS-junk).
• Add .sprinter-cc-*/, build/ (catches lib/build/ too), .claude/.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
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* gfx_raw_common.c — W3 page mapping primitives shared by every gfx mode.
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*
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* Composite primitives (gfx_line / gfx_rect / gfx_fill_rect / ...) bracket
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* their inner loop with one `_gfx_w3_video_begin()` / `_gfx_w3_video_end()`
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* pair and call the `*_raw` variants inside, so the W3 dance is paid once
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* per drawing operation instead of once per pixel. Single-shot wrappers
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* (gfx_putpixel, gfx_hline, ...) wrap the same way for their single call.
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*
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* Begin disables interrupts, saves the current W3 page byte, then maps
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* `_gfx_bank` (the current video bank, 0x50..0x5F). End restores the
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* saved page and re-enables interrupts.
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*
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* NOT re-entrant — saving the previous W3 byte in a static is safe only
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* because GFX runs with interrupts off between begin and end.
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*/
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#include <stdint.h>
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extern uint8_t _gfx_bank; /* current W3 video bank (gfx_core.c) */
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static uint8_t _gfx_saved_w3;
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void _gfx_w3_video_begin(void) __naked
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{
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__asm
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di
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in a, (#0xE2)
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ld (__gfx_saved_w3), a
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ld a, (__gfx_bank)
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out (#0xE2), a
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ret
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__endasm;
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}
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void _gfx_w3_video_end(void) __naked
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{
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__asm
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ld a, (__gfx_saved_w3)
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out (#0xE2), a
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ei
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ret
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__endasm;
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}
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