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add screen2_point

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This commit is contained in:
nino-porcino 2021-12-22 17:46:33 +01:00
parent 767c836695
commit 5139b381d3
1 changed files with 12 additions and 3 deletions
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15
lib/screen2.h
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@ -55,8 +55,9 @@ void screen2_puts(char *s, byte x, byte y, byte col) {
byte screen2_plot_mode = PLOT_MODE_SET;
byte pow2_table_reversed[8] = { 128,64,32,16,8,4,2,1 };
void screen2_plot(byte x, byte y) {
byte pow2_table_reversed[8] = { 128,64,32,16,8,4,2,1 };
word paddr = TMS_PATTERN_TABLE + (word)(x & 0b11111000) + (word)(y & 0b11111000)*32 + y%8;
tms_set_vram_read_addr(paddr);
byte data = TMS_READ_DATA_PORT;
@ -76,6 +77,13 @@ void screen2_plot(byte x, byte y) {
TMS_WRITE_DATA_PORT(data);
}
byte screen2_point(byte x, byte y) {
word paddr = TMS_PATTERN_TABLE + (word)(x & 0b11111000) + (word)(y & 0b11111000)*32 + y%8;
tms_set_vram_read_addr(paddr);
byte data = TMS_READ_DATA_PORT;
byte mask = pow2_table_reversed[x%8];
return (data & mask) != 0 ? 1 : 0;
}
signed int math_abs(signed int x) {
return x < 0 ? -x : x;
@ -106,11 +114,12 @@ void screen2_line(byte _x0, byte _y0, byte _x1, byte _y1) {
}
}
#define mul(a,b) ((signed long)mulf16s((signed int)(a),(signed int)(b)))
// http://members.chello.at/~easyfilter/bresenham.html
/* TODO: FIX THIS, IT DOES NOT DRAW AN ELLIPSE
void screen2_ellipse_rect(byte _x0, byte _y0, byte _x1, byte _y1)
{
/*
if (tms_global_mulf_initialized == 0) {
mulf_init();
tms_global_mulf_initialized = 1;
@ -153,9 +162,9 @@ void screen2_ellipse_rect(byte _x0, byte _y0, byte _x1, byte _y1)
}
}
}
*/
// http://members.chello.at/~easyfilter/bresenham.html
void screen2_circle(byte _xm, byte _ym, byte _r) {