From cf5f90d20f12d3e13a285bd199639b7aaea8395e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Thu, 4 Sep 2025 18:54:17 -0700
Subject: Add support for ortho maps.

Not properly tested because the demo map apparently has alpha=0 everywhere.
---
 src/gfx2d.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 74 insertions(+), 11 deletions(-)

(limited to 'src/gfx2d.c')

diff --git a/src/gfx2d.c b/src/gfx2d.c
index 1c3cc39..6630c95 100644
--- a/src/gfx2d.c
+++ b/src/gfx2d.c
@@ -583,8 +583,28 @@ static void draw_rect(
   }
 }
 
-/// Draw a tile.
-static void draw_tile(IsoGfx* iso, Tile tile, int iso_x, int iso_y) {
+/// Draw a tile in an orthogonal map.
+static void draw_tile_ortho(IsoGfx* iso, Tile tile, int x, int y) {
+  assert(iso);
+  assert(iso->tileset);
+  assert(x >= 0);
+  assert(y >= 0);
+  assert(x < iso->map->world_width);
+  assert(y < iso->map->world_height);
+
+  const Ts_Tile* pTile  = ts_tileset_get_tile(iso->tileset, tile);
+  const Pixel*   pixels = ts_tileset_get_tile_pixels(iso->tileset, tile);
+
+  const ivec2 screen_origin = map2screen(
+      iso->camera, iso->map->base_tile_width, iso->map->base_tile_height, x, y);
+
+  draw_rect(
+      &iso->screen, screen_origin, pTile->width, pTile->height, pixels,
+      nullptr);
+}
+
+/// Draw a tile in an isometric map.
+static void draw_tile_iso(IsoGfx* iso, Tile tile, int iso_x, int iso_y) {
   assert(iso);
   assert(iso->tileset);
   assert(iso_x >= 0);
@@ -613,14 +633,27 @@ static void draw_tile(IsoGfx* iso, Tile tile, int iso_x, int iso_y) {
       &iso->screen, top_left, pTile->width, pTile->height, pixels, nullptr);
 }
 
-static void draw_map(IsoGfx* iso) {
+static void draw_map_ortho(IsoGfx* iso) {
   assert(iso);
+  assert(iso->map);
 
-  const int W = iso->screen.width;
-  const int H = iso->screen.height;
+  // TODO: Same TODOs as in draw_map_iso().
 
-  memset(iso->screen.pixels, 0, W * H * sizeof(Pixel));
+  const Tm_Layer* layer = tm_map_get_layer(iso->map, 0);
+
+  for (int wy = 0; wy < iso->map->world_height; ++wy) {
+    for (int wx = 0; wx < iso->map->world_width; ++wx) {
+      const Tile tile = tm_layer_get_tile(iso->map, layer, wx, wy);
+      draw_tile_ortho(iso, tile, wx, wy);
+    }
+  }
+}
+
+static void draw_map_iso(IsoGfx* iso) {
+  assert(iso);
+  assert(iso->map);
 
+  // TODO: Support for multiple layers.
   const Tm_Layer* layer = tm_map_get_layer(iso->map, 0);
 
   // TODO: Culling.
@@ -631,11 +664,32 @@ static void draw_map(IsoGfx* iso) {
   for (int wy = 0; wy < iso->map->world_height; ++wy) {
     for (int wx = 0; wx < iso->map->world_width; ++wx) {
       const Tile tile = tm_layer_get_tile(iso->map, layer, wx, wy);
-      draw_tile(iso, tile, wx, wy);
+      draw_tile_iso(iso, tile, wx, wy);
     }
   }
 }
 
+static void draw_map(IsoGfx* iso) {
+  assert(iso);
+  assert(iso->map);
+  assert(iso->screen.pixels);
+
+  const int W = iso->screen.width;
+  const int H = iso->screen.height;
+
+  memset(iso->screen.pixels, 0, W * H * sizeof(Pixel));
+
+  const Tm_Flags* flags = (const Tm_Flags*)&iso->map->flags;
+  switch (flags->orientation) {
+  case Tm_Orthogonal:
+    draw_map_ortho(iso);
+    break;
+  case Tm_Isometric:
+    draw_map_iso(iso);
+    break;
+  }
+}
+
 static void draw_sprite(
     IsoGfx* iso, const SpriteInstance* sprite, const Ss_SpriteSheet* sheet) {
   assert(iso);
@@ -665,9 +719,7 @@ static void draw_sprites(IsoGfx* iso) {
 
   for (const SpriteInstance* sprite = iso->head_sprite; sprite;
        sprite                       = sprite->next) {
-    const Ss_SpriteSheet* sheet = sprite->sheet;
-    assert(sheet);
-    draw_sprite(iso, sprite, sheet);
+    draw_sprite(iso, sprite, sprite->sheet);
   }
 }
 
@@ -683,7 +735,18 @@ void isogfx_render(IsoGfx* iso) {
 }
 
 void isogfx_draw_tile(IsoGfx* iso, int x, int y, Tile tile) {
-  draw_tile(iso, tile, x, y);
+  assert(iso);
+  assert(iso->map);
+
+  const Tm_Flags* flags = (const Tm_Flags*)&iso->map->flags;
+  switch (flags->orientation) {
+  case Tm_Orthogonal:
+    draw_tile_ortho(iso, tile, x, y);
+    break;
+  case Tm_Isometric:
+    draw_tile_iso(iso, tile, x, y);
+    break;
+  }
 }
 
 void isogfx_get_screen_size(const IsoGfx* iso, int* width, int* height) {
-- 
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