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terminal-vga: Rewrite display caching so it's actually fast, and buffered

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This commit is contained in:
K. Lange 2021-11-24 15:47:33 +09:00
parent f748f2d523
commit b4f5eb4b01
1 changed files with 17 additions and 6 deletions
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23
apps/terminal-vga.c
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@ -435,13 +435,21 @@ void handle_input_s(char * c) {
}
unsigned short * textmemptr = NULL;
unsigned short * mirrorcopy = NULL;
unsigned short * basecopy = NULL;
unsigned short * flipcopy = NULL;
void placech(unsigned char c, int x, int y, int attr) {
unsigned int where = y * term_width + x;
unsigned int att = (c | (attr << 8));
if (mirrorcopy[where] != att) {
mirrorcopy[where] = att;
textmemptr[where] = att;
basecopy[where] = att;
}
static void maybe_write_screen(void) {
/* This says "maybe_" but we always draw whatever
* needs drawing... */
for (int i = 0; i < term_width * term_height; ++i) {
if (basecopy[i] != flipcopy[i]) {
textmemptr[i] = flipcopy[i] = basecopy[i];
}
}
}
@ -978,8 +986,10 @@ void reinit(void) {
memset(term_buffer_b, 0x0, sizeof(term_cell_t) * term_width * term_height);
term_buffer = term_buffer_a;
mirrorcopy = malloc(sizeof(unsigned short) * term_width * term_height);
memset(mirrorcopy, 0, sizeof(unsigned short) * term_width * term_height);
basecopy = malloc(sizeof(unsigned short) * term_width * term_height);
memset(basecopy, 0, sizeof(unsigned short) * term_width * term_height);
flipcopy = malloc(sizeof(unsigned short) * term_width * term_height);
memset(flipcopy, 0, sizeof(unsigned short) * term_width * term_height);
}
ansi_state = ansi_init(ansi_state, term_width, term_height, &term_callbacks);
@ -1331,6 +1341,7 @@ int main(int argc, char ** argv) {
handle_mouse_abs(&packet);
}
}
maybe_write_screen();
}
}