Implement double buffering drawing

1 files changed, 29 insertions, 2 deletions

diff --git a/src/text.h b/src/text.h
index b3bb601..b90c160 100644
--- a/src/text.h
+++ b/src/text.h
@@ -131,9 +131,9 @@ txt_putc_hybrid(char c) {
         unpack_tiles(packed_char, &tile, 1);
         int x = text_engine.cursor_x;
         int y = text_engine.cursor_y;
-        // DEBUG: should be on the text struct.
-        Tile *buf = &TILE_MEM[0];
+        Tile *buf = text_engine.memory;
         buf[x + y * 30] = tile;
+        dirty_tiles[y][x] = 1;
         text_engine.cursor_x += 1;
         if (text_engine.cursor_x >= 30) {
             text_engine.cursor_x = 0;
@@ -222,6 +222,33 @@ txt_init_bitmap(TextMode mode, Font font) {
     text_engine.mode = mode;
 }
 
+void
+txt_init_hybrid(TextMode mode, Font font, u32 *buf) {
+    // If font_map is NULL, initialize the standard 0-255 character map.
+    if (font.char_map == NULL) {
+        for (size_t i = 0; i < 256; ++i) {
+            default_char_map[i] = i;
+        }
+        font.char_map = &default_char_map;
+    }
+
+    // Initialize default values if set to zero.
+    if (font.char_width == 0) {
+        font.char_width = 8;
+    }
+    if (font.char_height == 0) {
+        font.char_height = 8;
+    }
+    if (font.color == 0) {
+        font.color = COLOR_WHITE;
+    }
+
+    // Prepare text engine.
+    text_engine.font = font;
+    text_engine.mode = mode;
+    text_engine.memory = *buf;
+}
+
 // Print text to the screen with formatting.
 void
 txt_printf(char *msg, ...) {