From eefe1f5ff9f9e3b6fc94f57f98b8cfe47affd7fb Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sun, 18 Apr 2021 19:04:51 +0200
Subject: Test using fonts as sprites with a custom loader

---
 src/main.c | 59 +++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 43 insertions(+), 16 deletions(-)

diff --git a/src/main.c b/src/main.c
index 7dd8dcd..17c6654 100644
--- a/src/main.c
+++ b/src/main.c
@@ -422,6 +422,26 @@ draw_logo() {
     draw_line(x + height, y + 1, x + height + line, y + 1, COLOR_WHITE);
 }
 
+void
+copy_font_to_tile_memory(Tile *tile) {
+    // Hex to bits translation table.
+    const u32 conversion_u32[16] = {
+        0x00000000, 0x00001000, 0x00000100, 0x00001100,
+        0x00000010, 0x00001010, 0x00000110, 0x00001110,
+        0x00000001, 0x00001001, 0x00000101, 0x00001101,
+        0x00000011, 0x00001011, 0x00000111, 0x00001111,
+    };
+    for (size_t i = 0; i < 250; ++i) {
+        for (size_t j = 0; j < 8; ++j) {
+            u8 row = font[i][j];
+            u32 tile_idx = 0x00000000;
+            tile_idx = conversion_u32[row & 0xF] << 16;
+            tile_idx |= conversion_u32[(row >> 4) & 0xF];
+            (tile + i)->data[j] = tile_idx;
+        }
+    }
+}
+
 int main(void) {
     // Configure the display in mode 0 to show OBJs, where tile memory is
     // sequential.
@@ -429,22 +449,23 @@ int main(void) {
 
     // Create two 4bpp tiles, one filled with color 1 and another with color 2.
     Tile *tile_mem = &TILE_MEM[4][512];
-    size_t n_tiles = 8;
-    u32 colors[] = {
-        0x11111111,
-        0x22222222,
-        0x33333333,
-        0x44444444,
-        0x55555555,
-        0x66666666,
-        0x77777777,
-        0x88888888,
-    };
-    for (size_t j = 0; j < n_tiles; ++j) {
-        for (size_t i = j * 8; i < 8 + 8 * j; ++i) {
-            tile_mem->data[i] = colors[j];
-        }
-    }
+    // size_t n_tiles = 8;
+    // u32 colors[] = {
+    //     0x11111111,
+    //     0x22222222,
+    //     0x33333333,
+    //     0x44444444,
+    //     0x55555555,
+    //     0x66666666,
+    //     0x77777777,
+    //     0x88888888,
+    // };
+    // for (size_t j = 0; j < n_tiles; ++j) {
+    //     for (size_t i = j * 8; i < 8 + 8 * j; ++i) {
+    //         tile_mem->data[i] = colors[j];
+    //     }
+    // }
+    copy_font_to_tile_memory(tile_mem);
 
     // Add colors to the sprite color palette. Tiles with color number 0 are
     // treated as transparent.
@@ -522,6 +543,12 @@ int main(void) {
                 active_sprite = 0;
             }
         }
+        if (key_pressed(KEY_L)) {
+            OBJ_ATTR_2(0) = OBJ_ATTR_2(0) - 1;
+        }
+        if (key_pressed(KEY_R)) {
+            OBJ_ATTR_2(0) = OBJ_ATTR_2(0) + 1;
+        }
 
         OBJ_ATTR_0(0) = (OBJ_ATTR_0(0) & ~0xFF)  | (y_a & 0xFF);
         OBJ_ATTR_1(0) = (OBJ_ATTR_1(0) & ~0x1FF) | (x_a & 0x1FF);
-- 
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