snark13
49a87b4d02
palette.h/video/palette.c wrap BIOS $A4 PIC_SET_PAL/PIC_GET_PAL and $A6 SET_PAL_INIT for the 8 palette pages (0-3 graphics, 4-7 text planes). gfx_palette.c and conio/text_palette.c are thin per-domain wrappers; text_palette.c maps the text "plane" 0..3 (paper/ink/blink-paper/ blink-ink) onto BIOS pages 4..7. Covered by tests/text_palette. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
|
|
* gfx_palette.c — graphics-side palette wrappers.
|
|
*
|
|
* The "legacy" entry points (gfx_pal_load / gfx_pal_set) keep their own
|
|
* inline-asm implementation rather than thunking through pal_*; this
|
|
* avoids depending on SDCC's __sdcccall(1) stack-shuffling for nested
|
|
* calls, which empirically misbehaves here (the trampoline corrupts the
|
|
* text palette so the next text-mode print hangs). Functionally these
|
|
* are identical to the old gfx_core.c versions.
|
|
*
|
|
* The newer get / reset helpers are simple wrappers — they're either
|
|
* not on hot paths or are first introduced here, so the thunk overhead
|
|
* doesn't matter and we get to share the asm with libc/video/palette.c.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <gfx.h>
|
|
#include <palette.h>
|
|
|
|
static uint8_t gpl_num_;
|
|
static uint8_t gpl_start_;
|
|
static uint8_t gpl_count_;
|
|
static uint16_t gpl_data_;
|
|
|
|
void gfx_pal_load(uint8_t pal_num, uint8_t start, uint8_t count,
|
|
const uint8_t *data)
|
|
{
|
|
gpl_num_ = pal_num;
|
|
gpl_start_ = start;
|
|
gpl_count_ = count;
|
|
gpl_data_ = (uint16_t)(uintptr_t)data;
|
|
|
|
__asm
|
|
push ix
|
|
ld a, (_gpl_start_)
|
|
ld e, a ; E = start
|
|
ld a, (_gpl_count_)
|
|
ld d, a ; D = count (0 → 256)
|
|
ld hl, (_gpl_data_) ; HL = data
|
|
ld b, #0xFF ; mask
|
|
ld a, (_gpl_num_) ; A = palette number
|
|
ld c, #0xA4 ; BIOS PIC_SET_PAL
|
|
rst #0x08
|
|
pop ix
|
|
__endasm;
|
|
}
|
|
|
|
void gfx_pal_set(uint8_t pal_num, uint8_t idx,
|
|
uint8_t r, uint8_t g, uint8_t b)
|
|
{
|
|
uint8_t entry[4];
|
|
entry[0] = b;
|
|
entry[1] = g;
|
|
entry[2] = r;
|
|
entry[3] = 0;
|
|
gfx_pal_load(pal_num, idx, 1, entry);
|
|
}
|
|
|
|
void gfx_pal_get(uint8_t pal_num, uint8_t start, uint8_t count,
|
|
uint8_t *data)
|
|
{
|
|
pal_get(pal_num, start, count, data);
|
|
}
|
|
|
|
void gfx_pal_get_color(uint8_t pal_num, uint8_t idx,
|
|
uint8_t *r, uint8_t *g, uint8_t *b)
|
|
{
|
|
pal_get_color(pal_num, idx, r, g, b);
|
|
}
|
|
|
|
void gfx_pal_reset(void)
|
|
{
|
|
pal_reset(PAL_GRAPH);
|
|
}
|