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| author | Daniel Serpell <daniel.serpell@gmail.com> | 2020-05-03 19:59:38 -0400 |
|---|---|---|
| committer | Daniel Serpell <daniel.serpell@gmail.com> | 2020-05-03 19:59:38 -0400 |
| commit | e3673b20e32aae8f6cbcb3606f09a7b030675cf2 (patch) | |
| tree | d0bab313f3f4fb8977dcb0379f7f9555f1c91db9 | |
| parent | 92b524291db8cb310bdc21517040238f8ab0a917 (diff) | |
| download | emu2-e3673b20e32aae8f6cbcb3606f09a7b030675cf2.tar.gz | |
Support setting video mode without clearing the screen.
| -rw-r--r-- | src/video.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/video.c b/src/video.c index f2ec035..d6e405b 100644 --- a/src/video.c +++ b/src/video.c @@ -25,6 +25,7 @@ static unsigned term_posx, term_posy, term_color, term_cursor; static unsigned term_sx, term_sy; // Current emulated video sizes and cursor position static unsigned vid_sx, vid_sy, vid_posx, vid_posy, vid_cursor, vid_color; +static unsigned vid_no_blank; // Signals that the terminal size needs updating static volatile int term_needs_update; // Terminal FD, allows video output even with redirection. @@ -92,13 +93,16 @@ static void clear_terminal(void) putc('\r', tty_file); // Go to column 0 } -static void clear_screen(void) +static void set_text_mode(int clear) { - debug(debug_video, "clear video screen\n"); + debug(debug_video, "set text mode%s\n", clear ? " and clear" : ""); // Clear video screen - uint16_t *vm = (uint16_t *)(memory + 0xB8000); - for(int i = 0; i < 16384; i++) - vm[i] = 0x0720; + if(clear) + { + uint16_t *vm = (uint16_t *)(memory + 0xB8000); + for(int i = 0; i < 16384; i++) + vm[i] = 0x0720; + } vid_posx = 0; vid_posy = 0; vid_color = 0x07; @@ -147,7 +151,7 @@ static void init_video(void) video_initialized = 1; // Set video mode - clear_screen(); + set_text_mode(1); clear_terminal(); term_needs_update = 0; term_cursor = 1; @@ -431,10 +435,13 @@ void int10() switch(ax >> 8) { case 0x00: // SET VIDEO MODE - if((ax & 0xFF) > 3) + if((ax & 0x7F) > 3) debug(debug_video, "-> SET GRAPHICS MODE %x<-\n", ax & 0xFF); else - clear_screen(); + { + set_text_mode((ax & 0x80) == 0); + vid_no_blank = ax & 0x80; + } break; case 0x01: // SET CURSOR SHAPE if((cpuGetCX() & 0x6000) == 0x2000) // Hide cursor |