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feat: terminal performance improvements, add scrolling and tabs

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This commit is contained in:
Daniel Hammer
2026-03-04 16:46:11 +01:00
parent 15915c175a
commit ba7b7dca87
3 changed files with 516 additions and 115 deletions
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programs/include/gui/terminal.hpp
+153 -80
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@@ -27,14 +27,17 @@ struct TerminalState {
int cols, rows;
int cursor_x, cursor_y;
int saved_cursor_x, saved_cursor_y; // saved cursor for alternate screen
int scroll_top;
int total_rows;
int scrollback_lines; // lines of history above visible screen (0..max_scrollback)
int max_scrollback; // 0 for viewers (klog), TERM_MAX_SCROLLBACK for terminal
int view_offset; // how many rows scrolled back (0 = live view)
int child_pid;
void* desktop; // DesktopState* for closing window on child exit
Color current_fg;
Color current_bg;
bool cursor_visible;
bool alt_screen_active;
bool reverse_video;
bool dirty; // true when content changed since last render
enum { STATE_NORMAL, STATE_ESC, STATE_CSI } parse_state;
bool csi_private; // true if '?' was seen after CSI
@@ -66,52 +69,77 @@ static inline Color term_ansi_color(int idx) {
}
}
// Helper: pointer to start of screen-relative row r in the cells buffer
static inline TermCell* term_screen_row(TerminalState* t, int r) {
return &t->cells[(t->scrollback_lines + r) * t->cols];
}
static inline void terminal_scroll_up(TerminalState* t) {
// Move all rows up by one
for (int r = 0; r < t->rows - 1; r++) {
for (int c = 0; c < t->cols; c++) {
t->cells[r * t->cols + c] = t->cells[(r + 1) * t->cols + c];
}
if (!t->alt_screen_active && t->scrollback_lines < t->max_scrollback) {
// Room for scrollback: top visible row becomes scrollback, no data movement
t->scrollback_lines++;
} else if (!t->alt_screen_active && t->max_scrollback > 0) {
// Scrollback full: discard oldest line, shift entire buffer up by one row
int total = (t->max_scrollback + t->rows - 1) * t->cols * sizeof(TermCell);
montauk::memmove(t->cells, t->cells + t->cols, total);
} else {
// Alt screen or no scrollback (klog): shift visible area up
TermCell* screen = term_screen_row(t, 0);
montauk::memmove(screen, screen + t->cols, (t->rows - 1) * t->cols * sizeof(TermCell));
}
// Clear last row
int last = t->rows - 1;
// Clear the new bottom visible row
TermCell* bottom = term_screen_row(t, t->rows - 1);
for (int c = 0; c < t->cols; c++) {
t->cells[last * t->cols + c] = {' ', t->current_fg, colors::TERM_BG};
bottom[c] = {' ', t->current_fg, colors::TERM_BG};
}
// Keep user's scrolled-back viewport stable
if (t->view_offset > 0) {
t->view_offset++;
if (t->view_offset > t->scrollback_lines)
t->view_offset = t->scrollback_lines;
}
}
// Initialize only the cell grid (no child process). Used by viewers like klog.
static inline void terminal_init_cells(TerminalState* t, int cols, int rows) {
// max_sb = 0 for viewers, TERM_MAX_SCROLLBACK for the real terminal.
static inline void terminal_init_cells(TerminalState* t, int cols, int rows, int max_sb = 0) {
t->cols = cols;
t->rows = rows;
t->cursor_x = 0;
t->cursor_y = 0;
t->saved_cursor_x = 0;
t->saved_cursor_y = 0;
t->scroll_top = 0;
t->total_rows = rows;
t->scrollback_lines = 0;
t->max_scrollback = max_sb;
t->view_offset = 0;
t->current_fg = colors::TERM_FG;
t->current_bg = colors::TERM_BG;
t->cursor_visible = false;
t->alt_screen_active = false;
t->reverse_video = false;
t->dirty = true;
t->parse_state = TerminalState::STATE_NORMAL;
t->csi_private = false;
t->csi_param_count = 0;
t->csi_current_param = 0;
t->child_pid = 0;
int total_cells = cols * rows;
int total_cells = (rows + max_sb) * cols;
int screen_cells = rows * cols;
t->cells = (TermCell*)montauk::alloc(total_cells * sizeof(TermCell));
t->alt_cells = (TermCell*)montauk::alloc(total_cells * sizeof(TermCell));
t->alt_cells = (TermCell*)montauk::alloc(screen_cells * sizeof(TermCell));
for (int i = 0; i < total_cells; i++) {
t->cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
}
for (int i = 0; i < screen_cells; i++) {
t->alt_cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
}
}
static inline void terminal_init(TerminalState* t, int cols, int rows) {
terminal_init_cells(t, cols, rows);
terminal_init_cells(t, cols, rows, TERM_MAX_SCROLLBACK);
t->cursor_visible = true;
t->child_pid = montauk::spawn_redir("0:/os/shell.elf");
@@ -127,25 +155,28 @@ static inline void terminal_put_char(TerminalState* t, char ch) {
terminal_scroll_up(t);
t->cursor_y = t->rows - 1;
}
int idx = t->cursor_y * t->cols + t->cursor_x;
t->cells[idx].ch = ch;
t->cells[idx].fg = t->current_fg;
t->cells[idx].bg = t->current_bg;
TermCell* row = term_screen_row(t, t->cursor_y);
row[t->cursor_x].ch = ch;
row[t->cursor_x].fg = t->current_fg;
row[t->cursor_x].bg = t->current_bg;
t->cursor_x++;
}
static inline void terminal_enter_alt_screen(TerminalState* t) {
if (t->alt_screen_active) return;
t->alt_screen_active = true;
t->dirty = true;
// Save cursor
t->saved_cursor_x = t->cursor_x;
t->saved_cursor_y = t->cursor_y;
// Swap buffers: save main screen to alt_cells, clear main
// Save visible screen to alt_cells, clear visible screen
int total = t->cols * t->rows;
TermCell* screen = term_screen_row(t, 0);
for (int i = 0; i < total; i++) {
t->alt_cells[i] = t->cells[i];
t->cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
t->alt_cells[i] = screen[i];
screen[i] = {' ', colors::TERM_FG, colors::TERM_BG};
}
t->view_offset = 0;
t->cursor_x = 0;
t->cursor_y = 0;
}
@@ -153,10 +184,12 @@ static inline void terminal_enter_alt_screen(TerminalState* t) {
static inline void terminal_exit_alt_screen(TerminalState* t) {
if (!t->alt_screen_active) return;
t->alt_screen_active = false;
// Restore main screen from alt_cells
t->dirty = true;
// Restore visible screen from alt_cells
int total = t->cols * t->rows;
TermCell* screen = term_screen_row(t, 0);
for (int i = 0; i < total; i++) {
t->cells[i] = t->alt_cells[i];
screen[i] = t->alt_cells[i];
}
// Restore cursor
t->cursor_x = t->saved_cursor_x;
@@ -244,22 +277,31 @@ static inline void terminal_process_csi(TerminalState* t, char cmd) {
// Erase in display
if (p0 == 0) {
// Clear from cursor to end
TermCell* row = term_screen_row(t, t->cursor_y);
for (int x = t->cursor_x; x < t->cols; x++)
t->cells[t->cursor_y * t->cols + x] = {' ', t->current_fg, colors::TERM_BG};
for (int r = t->cursor_y + 1; r < t->rows; r++)
row[x] = {' ', t->current_fg, colors::TERM_BG};
for (int r = t->cursor_y + 1; r < t->rows; r++) {
TermCell* rp = term_screen_row(t, r);
for (int c = 0; c < t->cols; c++)
t->cells[r * t->cols + c] = {' ', t->current_fg, colors::TERM_BG};
rp[c] = {' ', t->current_fg, colors::TERM_BG};
}
} else if (p0 == 1) {
// Clear from start to cursor
for (int r = 0; r < t->cursor_y; r++)
for (int r = 0; r < t->cursor_y; r++) {
TermCell* rp = term_screen_row(t, r);
for (int c = 0; c < t->cols; c++)
t->cells[r * t->cols + c] = {' ', t->current_fg, colors::TERM_BG};
rp[c] = {' ', t->current_fg, colors::TERM_BG};
}
TermCell* row = term_screen_row(t, t->cursor_y);
for (int x = 0; x <= t->cursor_x; x++)
t->cells[t->cursor_y * t->cols + x] = {' ', t->current_fg, colors::TERM_BG};
row[x] = {' ', t->current_fg, colors::TERM_BG};
} else if (p0 == 2) {
// Clear entire screen
for (int i = 0; i < t->rows * t->cols; i++)
t->cells[i] = {' ', t->current_fg, colors::TERM_BG};
for (int r = 0; r < t->rows; r++) {
TermCell* rp = term_screen_row(t, r);
for (int c = 0; c < t->cols; c++)
rp[c] = {' ', t->current_fg, colors::TERM_BG};
}
t->cursor_x = 0;
t->cursor_y = 0;
}
@@ -271,8 +313,9 @@ static inline void terminal_process_csi(TerminalState* t, char cmd) {
if (p0 == 0) { start = t->cursor_x; end = t->cols; }
else if (p0 == 1) { start = 0; end = t->cursor_x + 1; }
else if (p0 == 2) { start = 0; end = t->cols; }
TermCell* row = term_screen_row(t, t->cursor_y);
for (int x = start; x < end; x++)
t->cells[t->cursor_y * t->cols + x] = {' ', t->current_fg, colors::TERM_BG};
row[x] = {' ', t->current_fg, colors::TERM_BG};
break;
}
case 'm': {
@@ -348,6 +391,7 @@ static inline void terminal_process_csi(TerminalState* t, char cmd) {
}
static inline void terminal_feed(TerminalState* t, const char* data, int len) {
if (len > 0) t->dirty = true;
for (int i = 0; i < len; i++) {
char ch = data[i];
@@ -423,18 +467,26 @@ static inline void terminal_feed(TerminalState* t, const char* data, int len) {
}
static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, int ph) {
if (!t->dirty) return;
t->dirty = false;
int cell_w = mono_cell_width();
int cell_h = mono_cell_height();
bool use_ttf = fonts::mono && fonts::mono->valid;
GlyphCache* gc = use_ttf ? fonts::mono->get_cache(fonts::TERM_SIZE) : nullptr;
// Fill background
// Fill background using row-copy: fill first row, then memcpy to the rest
uint32_t bg_px = colors::TERM_BG.to_pixel();
int total = pw * ph;
for (int i = 0; i < total; i++) {
pixels[i] = bg_px;
int row_bytes = pw * sizeof(uint32_t);
for (int i = 0; i < pw; i++) pixels[i] = bg_px;
for (int r = 1; r < ph; r++) {
montauk::memcpy(&pixels[r * pw], pixels, row_bytes);
}
// Determine which rows of the buffer to display
int base_row = t->scrollback_lines - t->view_offset;
if (base_row < 0) base_row = 0;
// Render each visible cell
int visible_rows = ph / cell_h;
int visible_cols = pw / cell_w;
@@ -442,23 +494,22 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
if (visible_cols > t->cols) visible_cols = t->cols;
for (int r = 0; r < visible_rows; r++) {
int py = r * cell_h;
int src_row = base_row + r;
for (int c = 0; c < visible_cols; c++) {
int idx = r * t->cols + c;
int idx = src_row * t->cols + c;
TermCell& cell = t->cells[idx];
int px = c * cell_w;
int py = r * cell_h;
// Only draw cell background if it differs from terminal bg
uint32_t cell_bg = cell.bg.to_pixel();
// Draw cell background
for (int fy = 0; fy < cell_h; fy++) {
int dy = py + fy;
if (dy >= ph) break;
for (int fx = 0; fx < cell_w; fx++) {
int dx = px + fx;
if (dx >= pw) break;
pixels[dy * pw + dx] = cell_bg;
if (cell_bg != bg_px) {
for (int fy = 0; fy < cell_h && py + fy < ph; fy++) {
uint32_t* row = &pixels[(py + fy) * pw + px];
for (int fx = 0; fx < cell_w && px + fx < pw; fx++) {
row[fx] = cell_bg;
}
}
}
@@ -488,8 +539,9 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
}
}
// Draw cursor
if (t->cursor_visible && t->cursor_x < visible_cols && t->cursor_y < visible_rows) {
// Draw cursor (only when viewing live position)
if (t->view_offset == 0 && t->cursor_visible &&
t->cursor_x < visible_cols && t->cursor_y < visible_rows) {
int cx = t->cursor_x * cell_w;
int cy = t->cursor_y * cell_h;
uint32_t cursor_px = colors::WHITE.to_pixel();
@@ -504,8 +556,8 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
}
// Draw character on top of cursor in black
if (t->cursor_y < t->rows && t->cursor_x < t->cols) {
int idx = t->cursor_y * t->cols + t->cursor_x;
char ch = t->cells[idx].ch;
TermCell* row = term_screen_row(t, t->cursor_y);
char ch = row[t->cursor_x].ch;
if (ch > 32 || ch < 0) {
if (use_ttf) {
int baseline = cy + gc->ascent;
@@ -535,48 +587,55 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
static inline void terminal_resize(TerminalState* t, int new_cols, int new_rows) {
if (new_cols == t->cols && new_rows == t->rows) return;
if (new_cols < 1 || new_rows < 1) return;
t->dirty = true;
int new_total = new_cols * new_rows;
int new_capacity = new_rows + t->max_scrollback;
int new_total = new_capacity * new_cols;
TermCell* new_cells = (TermCell*)montauk::alloc(new_total * sizeof(TermCell));
TermCell* new_alt = (TermCell*)montauk::alloc(new_total * sizeof(TermCell));
TermCell* new_alt = (TermCell*)montauk::alloc(new_rows * new_cols * sizeof(TermCell));
// Clear new buffers
for (int i = 0; i < new_total; i++) {
for (int i = 0; i < new_total; i++)
new_cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
for (int i = 0; i < new_rows * new_cols; i++)
new_alt[i] = {' ', colors::TERM_FG, colors::TERM_BG};
}
// Copy existing content (as much as fits)
int copy_rows = t->rows < new_rows ? t->rows : new_rows;
// Copy content: scrollback + visible screen
int old_content = t->scrollback_lines + t->rows;
int keep = old_content < new_capacity ? old_content : new_capacity;
int discard = old_content - keep;
int copy_cols = t->cols < new_cols ? t->cols : new_cols;
// If cursor is beyond the new grid, scroll content up to keep cursor visible
int row_offset = 0;
if (t->cursor_y >= new_rows) {
row_offset = t->cursor_y - new_rows + 1;
}
for (int r = 0; r < copy_rows && (r + row_offset) < t->rows; r++) {
for (int r = 0; r < keep; r++) {
for (int c = 0; c < copy_cols; c++) {
new_cells[r * new_cols + c] = t->cells[(r + row_offset) * t->cols + c];
new_cells[r * new_cols + c] = t->cells[(discard + r) * t->cols + c];
}
}
int new_scrollback = keep - new_rows;
if (new_scrollback < 0) new_scrollback = 0;
// Adjust cursor
int abs_cursor_y = t->scrollback_lines + t->cursor_y - discard;
int new_cursor_y = abs_cursor_y - new_scrollback;
if (new_cursor_y < 0) new_cursor_y = 0;
if (new_cursor_y >= new_rows) new_cursor_y = new_rows - 1;
int new_cursor_x = t->cursor_x < new_cols ? t->cursor_x : new_cols - 1;
if (t->cells) montauk::free(t->cells);
if (t->alt_cells) montauk::free(t->alt_cells);
t->cells = new_cells;
t->alt_cells = new_alt;
int old_cols = t->cols;
t->cols = new_cols;
t->rows = new_rows;
t->scrollback_lines = new_scrollback;
t->cursor_x = new_cursor_x;
t->cursor_y = new_cursor_y;
// Adjust cursor position
t->cursor_y -= row_offset;
if (t->cursor_x >= new_cols) t->cursor_x = new_cols - 1;
if (t->cursor_y >= new_rows) t->cursor_y = new_rows - 1;
if (t->cursor_y < 0) t->cursor_y = 0;
// Clamp view offset
if (t->view_offset > t->scrollback_lines)
t->view_offset = t->scrollback_lines;
// Notify child process of new terminal size
if (t->child_pid > 0) {
@@ -585,18 +644,32 @@ static inline void terminal_resize(TerminalState* t, int new_cols, int new_rows)
}
static inline void terminal_handle_key(TerminalState* t, const Montauk::KeyEvent& key) {
// Snap to live on any keyboard input
if (t->view_offset > 0) {
t->view_offset = 0;
t->dirty = true;
}
if (t->child_pid > 0) {
montauk::childio_writekey(t->child_pid, &key);
}
}
static inline void terminal_poll(TerminalState* t) {
if (t->child_pid <= 0) return;
char buf[512];
int n = montauk::childio_read(t->child_pid, buf, sizeof(buf));
if (n > 0) {
terminal_feed(t, buf, n);
// Returns false if the child process has exited
static inline bool terminal_poll(TerminalState* t) {
if (t->child_pid <= 0) return false;
char buf[4096];
// Drain all available data so large output renders in one frame
for (;;) {
int n = montauk::childio_read(t->child_pid, buf, sizeof(buf));
if (n > 0) {
terminal_feed(t, buf, n);
} else {
// n == -1 means child process is gone; n == 0 means no data yet
if (n < 0) { t->child_pid = 0; return false; }
break;
}
}
return true;
}
} // namespace gui