From f3cb626f7bcb2d181f58826e435941eb47613260 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Mon, 17 Oct 2022 13:56:52 +0200
Subject: a

---
 main/app.hpp  |  3 +++
 main/draw.cpp | 48 ++++++++++++++++++++++++++++--------------------
 2 files changed, 31 insertions(+), 20 deletions(-)

diff --git a/main/app.hpp b/main/app.hpp
index 1237f205..82d5dd73 100644
--- a/main/app.hpp
+++ b/main/app.hpp
@@ -50,6 +50,7 @@ struct app final : Platform::Application
     void event_mouse_leave();
 
     void drawEvent() override;
+    std::array<std::int16_t, 4> get_draw_bounds() const noexcept;
     void draw_world();
     void draw_wireframe_quad(global_coords pt);
     void draw_wireframe_box(local_coords pt);
@@ -98,6 +99,8 @@ struct app final : Platform::Application
     enum_bitset<key> keys;
     Magnum::Timeline timeline;
     editor _editor;
+
+    static constexpr std::int32_t BASE_X = 0, BASE_Y = 0;
 };
 
 constexpr Vector2 app::project(const Vector3 pt)
diff --git a/main/draw.cpp b/main/draw.cpp
index fde48915..691095b2 100644
--- a/main/draw.cpp
+++ b/main/draw.cpp
@@ -34,25 +34,31 @@ void app::drawEvent() {
     timeline.nextFrame();
 }
 
-void app::draw_world()
+std::array<std::int16_t, 4> app::get_draw_bounds() const noexcept
 {
-    // TODO chunk offset
-    std::int16_t minx = 0, maxx = 0, miny = 0, maxy = 0;
+    std::int16_t minx = BASE_X, maxx = BASE_X, miny = BASE_Y, maxy = BASE_Y;
     {
-        const auto fn = [&](int x, int y) {
-          const auto pos = pixel_to_tile({(float)x, (float)y}).chunk();
-          minx = std::min(minx, pos.x);
-          maxx = std::max(maxx, pos.x);
-          miny = std::min(miny, pos.y);
-          maxy = std::max(maxy, pos.y);
+        const auto fn = [&](std::int32_t x, std::int32_t y) {
+            const auto pos = pixel_to_tile({float(x + BASE_X), float(y + BASE_Y)}).chunk();
+            minx = std::min(minx, pos.x);
+            maxx = std::max(maxx, pos.x);
+            miny = std::min(miny, pos.y);
+            maxy = std::max(maxy, pos.y);
         };
         const auto sz = windowSize();
-        const auto x = sz[0], y = sz[1];
+        const auto x = sz[0]-1, y = sz[1]-1;
         fn(0, 0);
         fn(x, 0);
         fn(0, y);
         fn(x, y);
     }
+    fflush(stdout);
+    return {minx, maxx, miny, maxy};
+}
+
+void app::draw_world()
+{
+    auto [minx, maxx, miny, maxy] = get_draw_bounds();
 
     const auto old_camera_offset = _shader.camera_offset();
     _shader.set_tint({1, 1, 1, 1});
@@ -60,9 +66,14 @@ void app::draw_world()
     for (std::int16_t y = miny; y <= maxy; y++)
         for (std::int16_t x = minx; x <= maxx; x++)
         {
-            const auto offset = project({float(x)*TILE_MAX_DIM*TILE_SIZE[0],
-                                         float(y)*TILE_MAX_DIM*TILE_SIZE[1],
+            const auto offset = project({float(x + BASE_X)*TILE_MAX_DIM*TILE_SIZE[0],
+                                         float(y + BASE_Y)*TILE_MAX_DIM*TILE_SIZE[1],
                                          0});
+            if (x == 0 && y == 0)
+            {
+                printf("0 0 --> %f %f\n", offset[0], offset[1]);
+                fflush(stdout);
+            }
             _shader.set_camera_offset(offset + old_camera_offset);
             auto c = _world[chunk_coords{x, y}];
             _floor_mesh.draw(_shader, *c);
@@ -71,9 +82,9 @@ void app::draw_world()
     for (std::int16_t y = miny; y <= maxy; y++)
         for (std::int16_t x = minx; x <= maxx; x++)
         {
-            const auto offset = project({float(x)*TILE_MAX_DIM*TILE_SIZE[0],
-                                          float(y)*TILE_MAX_DIM*TILE_SIZE[1],
-                                          0});
+            const auto offset = project({float(x + BASE_X)*TILE_MAX_DIM*TILE_SIZE[0],
+                                         float(y + BASE_Y)*TILE_MAX_DIM*TILE_SIZE[1],
+                                         0});
             _shader.set_camera_offset(offset + old_camera_offset);
             auto c = _world[chunk_coords{x, y}];
             _wall_mesh.draw(_shader, *c);
@@ -86,11 +97,8 @@ void app::draw_wireframe_quad(global_coords pos)
 {
     constexpr float LINE_WIDTH = 1;
 
-    {
-        const auto c = _world[pos.chunk()];
-        if (const auto& tile = (*c)[pos.local()]; !tile.ground_image)
-            return;
-    }
+    if (const auto& [c, tile] = _world[pos]; !tile.ground_image)
+        return;
 
     const auto pt = pos.to_signed();
     constexpr auto X = TILE_SIZE[0], Y = TILE_SIZE[1];
-- 
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