Editor now allows tile placement

You can scroll through the three layers (map, track, object) with Z/X. You can swap between focusing on the map and the tileset with TAB. You can place tiles with enter or space. Pretty rudimentary, but it's a start.

13 files changed, 496 insertions, 56 deletions

@@ -4,7 +4,9 @@
 #include "vector.h"
 
 constexpr vec2s TILE_SIZE { 32, 32 };
-constexpr vec2s LEVEL_SIZE { 16, 16 };
-constexpr vec2s WINDOW_SIZE = TILE_SIZE * LEVEL_SIZE;
+constexpr vec2s MAP_SIZE { 16, 16 };
+constexpr vec2s LEVEL_SIZE = TILE_SIZE * MAP_SIZE;
+constexpr vec2s BORDER_SIZE = TILE_SIZE;
+constexpr vec2s WINDOW_SIZE = LEVEL_SIZE * vec2s { 2, 1 } + BORDER_SIZE * 2;
 
 #endif /* end of include guard: CONSTS_H_8019F1B3 */
@@ -5,27 +5,150 @@ void Editor::tick(
   double dt,
   const Uint8* keystate)
 {
+  if (keystate[SDL_SCANCODE_LEFT] ||
+      keystate[SDL_SCANCODE_UP] ||
+      keystate[SDL_SCANCODE_RIGHT] ||
+      keystate[SDL_SCANCODE_DOWN])
+  {
+    // If the player is holding down a directional key, accumulate the time
+    // since the last tick, and then apply the directional key as many times as
+    // needed. The input lag class automatically handles the delays necessary
+    // for key repeat.
+    inputLag_.accumulate(dt);
 
-}
+    while (inputLag_.step())
+    {
+      if (mapFocus_)
+      {
+        // If we are focused on the map, move the map cursor.
+        if (keystate[SDL_SCANCODE_LEFT] && cursor_.x() > 0)
+        {
+          cursor_.x()--;
+        }
 
-void Editor::render(SDL_Renderer* ren)
-{
-  if (!background_)
+        if (keystate[SDL_SCANCODE_UP] && cursor_.y() > 0)
+        {
+          cursor_.y()--;
+        }
+
+        if (keystate[SDL_SCANCODE_RIGHT] &&
+            cursor_.x() < level_.getSize().w() - 1)
+        {
+          cursor_.x()++;
+        }
+
+        if (keystate[SDL_SCANCODE_DOWN] &&
+            cursor_.y() < level_.getSize().h() - 1)
+        {
+          cursor_.y()++;
+        }
+      } else {
+        // If we are focused on the tileset, rotate through the selection of
+        // tiles.
+        if (keystate[SDL_SCANCODE_UP])
+        {
+          selectedTile_--;
+        } else if (keystate[SDL_SCANCODE_DOWN])
+        {
+          selectedTile_++;
+        }
+
+        selectedTile_ %= level_.getTileset(layer_).getNumTiles();
+      }
+    }
+  } else if (inputLag_.isActive())
   {
-    surface_ptr bgSurf(IMG_Load("../res/editor_bg.png"));
+    // If the player is not holding down a directional key, reset the input lag.
+    inputLag_.reset();
+  }
+
+  // Check for keypress changes since the last tick.
+  input_.tick(keystate);
 
-    if (!bgSurf)
+  if (input_.wasPressed(SDL_SCANCODE_Z))
+  {
+    switch (layer_)
     {
-      throw img_error();
+      case Layer::map:
+      {
+        layer_ = Layer::object;
+
+        break;
+      }
+
+      case Layer::track:
+      {
+        layer_ = Layer::map;
+
+        break;
+      }
+
+      case Layer::object:
+      {
+        layer_ = Layer::track;
+
+        break;
+      }
     }
 
-    background_.reset(SDL_CreateTextureFromSurface(ren, bgSurf.get()));
-    bgSize_ = { bgSurf->w, bgSurf->h };
+    selectedTile_ = 0;
+
+    // Reset the cached map so that it gets redrawn with the focused layer.
+    renderedMap_.reset();
+  } else if (input_.wasPressed(SDL_SCANCODE_X))
+  {
+    switch (layer_)
+    {
+      case Layer::map:
+      {
+        layer_ = Layer::track;
+
+        break;
+      }
+
+      case Layer::track:
+      {
+        layer_ = Layer::object;
+
+        break;
+      }
+
+      case Layer::object:
+      {
+        layer_ = Layer::map;
+
+        break;
+      }
+    }
+
+    selectedTile_ = 0;
+
+    // Reset the cached map so that it gets redrawn with the focused layer.
+    renderedMap_.reset();
+  } else if (input_.wasPressed(SDL_SCANCODE_TAB))
+  {
+    mapFocus_ = !mapFocus_;
   }
 
-  for (int y = 0; y < WINDOW_SIZE.h() / bgSize_.h(); y++)
+  if (mapFocus_)
   {
-    for (int x = 0; x < WINDOW_SIZE.w() / bgSize_.w(); x++)
+    if (keystate[SDL_SCANCODE_RETURN] ||
+        keystate[SDL_SCANCODE_SPACE])
+    {
+      level_.at(cursor_.x(), cursor_.y(), layer_) = selectedTile_;
+
+      // Reset the cached map so that it gets redrawn with the new tile.
+      renderedMap_.reset();
+    }
+  }
+}
+
+void Editor::render(SDL_Renderer* ren)
+{
+  // Tile the background art.
+  for (int y = 0; y <= WINDOW_SIZE.h() / bgSize_.h(); y++)
+  {
+    for (int x = 0; x <= WINDOW_SIZE.w() / bgSize_.w(); x++)
     {
       SDL_Rect rect {
         x * bgSize_.w(),
@@ -37,4 +160,105 @@ void Editor::render(SDL_Renderer* ren)
       SDL_RenderCopy(ren, background_.get(), nullptr, &rect);
     }
   }
+
+  // Render and cache the map if the cache is currently empty.
+  if (!renderedMap_)
+  {
+    renderedMap_.reset(
+      SDL_CreateTexture(
+        ren,
+        SDL_PIXELFORMAT_RGBA8888,
+        SDL_TEXTUREACCESS_TARGET,
+        LEVEL_SIZE.w(),
+        LEVEL_SIZE.h()));
+
+    // Render each layer separately, then compose them atop each other. Layers
+    // above the currently selected one are drawn semi-transparently.
+    texture_ptr mapRender = level_.render(ren, Layer::map);
+    texture_ptr trackRender = level_.render(ren, Layer::track);
+    texture_ptr objectRender = level_.render(ren, Layer::object);
+
+    if (layer_ < Layer::track)
+    {
+      SDL_SetTextureBlendMode(trackRender.get(), SDL_BLENDMODE_BLEND);
+      SDL_SetTextureAlphaMod(trackRender.get(), 127);
+    }
+
+    if (layer_ < Layer::object)
+    {
+      SDL_SetTextureBlendMode(objectRender.get(), SDL_BLENDMODE_BLEND);
+      SDL_SetTextureAlphaMod(objectRender.get(), 127);
+    }
+
+    SDL_SetRenderTarget(ren, renderedMap_.get());
+    SDL_RenderCopy(ren, mapRender.get(), nullptr, nullptr);
+    SDL_RenderCopy(ren, trackRender.get(), nullptr, nullptr);
+    SDL_RenderCopy(ren, objectRender.get(), nullptr, nullptr);
+    SDL_SetRenderTarget(ren, nullptr);
+  }
+
+  // Copy the rendered map onto the editor.
+  SDL_Rect mapLoc {
+    static_cast<int>(BORDER_SIZE.w()),
+    static_cast<int>(BORDER_SIZE.h()),
+    static_cast<int>(LEVEL_SIZE.w()),
+    static_cast<int>(LEVEL_SIZE.h())
+  };
+
+  SDL_RenderCopy(ren, renderedMap_.get(), nullptr, &mapLoc);
+
+  // If the map is focused, draw an outline around it.
+  if (mapFocus_)
+  {
+    SDL_SetRenderDrawColor(ren, 255, 0, 0, 255);
+    SDL_RenderDrawRect(ren, &mapLoc);
+  }
+
+  // Draw a box indicating the position of the map cursor.
+  vec2s cursorLoc = BORDER_SIZE + TILE_SIZE * cursor_;
+
+  SDL_Rect cursorRect {
+    static_cast<int>(cursorLoc.x()),
+    static_cast<int>(cursorLoc.y()),
+    static_cast<int>(TILE_SIZE.w()),
+    static_cast<int>(TILE_SIZE.h())
+  };
+
+  SDL_SetRenderDrawColor(ren, 255, 0, 0, 255);
+  SDL_RenderDrawRect(ren, &cursorRect);
+
+  // Draw the tileset for the currently selected layer.
+  SDL_Rect tilesetLoc {
+    static_cast<int>(BORDER_SIZE.w() * 2 + LEVEL_SIZE.w()),
+    static_cast<int>(BORDER_SIZE.h()),
+    static_cast<int>(TILE_SIZE.w()),
+    level_.getTileset(layer_).getSize().h()
+  };
+
+  SDL_SetRenderDrawColor(ren, 255, 255, 255, 255);
+  SDL_RenderFillRect(ren, &tilesetLoc);
+
+  SDL_RenderCopy(
+    ren,
+    level_.getTileset(layer_).getImage().get(),
+    nullptr,
+    &tilesetLoc);
+
+  // If the tileset is focused, draw an outline around it.
+  if (!mapFocus_)
+  {
+    SDL_SetRenderDrawColor(ren, 255, 0, 0, 255);
+    SDL_RenderDrawRect(ren, &tilesetLoc);
+  }
+
+  // Draw a box indicating which tile is currently selected.
+  SDL_Rect tileCursorRect {
+    tilesetLoc.x,
+    static_cast<int>((1 + selectedTile_) * TILE_SIZE.h()),
+    static_cast<int>(TILE_SIZE.w()),
+    static_cast<int>(TILE_SIZE.h())
+  };
+
+  SDL_SetRenderDrawColor(ren, 255, 255, 0, 255);
+  SDL_RenderDrawRect(ren, &tileCursorRect);
 }
@@ -3,10 +3,26 @@
 
 #include "state.h"
 #include "vector.h"
+#include "level.h"
+#include "input.h"
+#include "input_lag.h"
 
 class Editor : public State {
 public:
 
+  Editor(SDL_Renderer* ren) : level_(ren)
+  {
+    surface_ptr bgSurf(IMG_Load("../res/editor_bg.png"));
+
+    if (!bgSurf)
+    {
+      throw img_error();
+    }
+
+    background_.reset(SDL_CreateTextureFromSurface(ren, bgSurf.get()));
+    bgSize_ = { bgSurf->w, bgSurf->h };
+  }
+
   void tick(
     double dt,
     const Uint8* keystate) override;
@@ -15,9 +31,23 @@ public:
 
 private:
 
+  Level level_;
+
   texture_ptr background_;
   vec2i bgSize_;
 
+  texture_ptr renderedMap_;
+
+  bool mapFocus_ = true;
+  vec2s cursor_;
+
+  size_t selectedTile_ = 0;
+
+  Input input_;
+  InputLag inputLag_;
+
+  Layer layer_ = Layer::map;
+
 };
 
 #endif /* end of include guard: EDITOR_H_8BB54FE3 */
@@ -0,0 +1,39 @@
+#ifndef INPUT_H_0FB34C42
+#define INPUT_H_0FB34C42
+
+#include <SDL.h>
+#include <vector>
+
+/**
+ * Helper class that detects when a key is newly pressed.
+ */
+class Input {
+public:
+
+  Input()
+  {
+    const Uint8* s = SDL_GetKeyboardState(&length_);
+
+    curstate_.assign(s, s + length_);
+    prevstate_ = curstate_;
+  }
+
+  void tick(const Uint8* keystate)
+  {
+    prevstate_ = std::move(curstate_);
+    curstate_.assign(keystate, keystate + length_);
+  }
+
+  bool wasPressed(int scancode) const
+  {
+    return curstate_.at(scancode) && !prevstate_.at(scancode);
+  }
+
+private:
+
+  int length_;
+  std::vector<Uint8> curstate_;
+  std::vector<Uint8> prevstate_;
+};
+
+#endif /* end of include guard: INPUT_H_0FB34C42 */
@@ -0,0 +1,66 @@
+#ifndef INPUT_LAG_H_DF16F381
+#define INPUT_LAG_H_DF16F381
+
+/**
+ * Helper class that handles key repeat.
+ */
+class InputLag {
+public:
+
+  bool isActive() const
+  {
+    return active_;
+  }
+
+  void reset()
+  {
+    accum_ = 0.0;
+    active_ = false;
+    repeat_ = false;
+  }
+
+  void accumulate(double dt)
+  {
+    accum_ += dt;
+  }
+
+  bool step()
+  {
+    if (!active_)
+    {
+      active_ = true;
+
+      return true;
+    } else if (!repeat_)
+    {
+      if (accum_ > delay_)
+      {
+        accum_ -= delay_;
+        repeat_ = true;
+
+        return true;
+      }
+    } else {
+      if (accum_ > tick_)
+      {
+        accum_ -= tick_;
+
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+private:
+
+  double tick_ = 1.0 / 15.0;
+  double delay_ = tick_ * 3.0;
+
+  double accum_ = 0.0;
+  bool active_ = false;
+  bool repeat_ = false;
+
+};
+
+#endif /* end of include guard: INPUT_LAG_H_DF16F381 */
@@ -7,30 +7,37 @@ texture_ptr Level::render(SDL_Renderer* ren, Layer layer) const
       ren,
       SDL_PIXELFORMAT_RGBA8888,
       SDL_TEXTUREACCESS_TARGET,
-      WINDOW_SIZE.w(),
-      WINDOW_SIZE.h()));
+      LEVEL_SIZE.w(),
+      LEVEL_SIZE.h()));
 
   SDL_SetRenderTarget(ren, canvas.get());
+  SDL_SetTextureBlendMode(canvas.get(), SDL_BLENDMODE_BLEND);
+  SDL_SetRenderDrawColor(ren, 0, 0, 0, 0);
+  SDL_RenderFillRect(ren, nullptr);
 
   for (size_t y = 0; y < size_.h(); y++)
   {
     for (size_t x = 0; x < size_.w(); x++)
     {
-      if (layer == Layer::map)
-      {
-        int val = 255 - at(x, y) * 10;
-
-        SDL_SetRenderDrawColor(ren, val, val, val, 255);
-
-        SDL_Rect rect {
-          static_cast<int>(x * TILE_SIZE.w()),
-          static_cast<int>(y * TILE_SIZE.h()),
-          TILE_SIZE.w(),
-          TILE_SIZE.h()
-        };
-
-        SDL_RenderFillRect(ren, &rect);
-      }
+      SDL_Rect src {
+        0,
+        static_cast<int>(at(x, y, layer) * TILE_SIZE.h()),
+        TILE_SIZE.w(),
+        TILE_SIZE.h()
+      };
+
+      SDL_Rect dest {
+        static_cast<int>(x * TILE_SIZE.w()),
+        static_cast<int>(y * TILE_SIZE.h()),
+        TILE_SIZE.w(),
+        TILE_SIZE.h()
+      };
+
+      SDL_RenderCopy(
+        ren,
+        getTileset(layer).getImage().get(),
+        &src,
+        &dest);
     }
   }
 
@@ -6,15 +6,22 @@
 #include "vector.h"
 #include "consts.h"
 #include "tileset.h"
+#include "enums.h"
 
 class Level {
 public:
 
-  Level()
+  Level(
+    SDL_Renderer* ren) :
+      mapTileset_(ren, "map.png"),
+      trackTileset_(ren, "track.png"),
+      objectTileset_(ren, "object.png")
   {
-    size_ = LEVEL_SIZE;
+    size_ = MAP_SIZE;
 
-    tiles_.resize(size_.w() * size_.h());
+    mapTiles_.resize(size_.w() * size_.h());
+    trackTiles_.resize(size_.w() * size_.h());
+    objectTiles_.resize(size_.w() * size_.h());
   }
 
   const vec2s& getSize() const
@@ -22,19 +29,48 @@ public:
     return size_;
   }
 
-  size_t at(vec2s pos) const
+  size_t at(vec2s pos, Layer layer = Layer::map) const
   {
-    return at(pos.x(), pos.y());
+    return at(pos.x(), pos.y(), layer);
   }
 
-  size_t at(size_t x, size_t y) const
+  size_t& at(vec2s pos, Layer layer = Layer::map)
   {
-    return tiles_.at(x + size_.w() * y);
+    return at(pos.x(), pos.y(), layer);
   }
 
-  const Tileset& getTileset() const
+  size_t at(size_t x, size_t y, Layer layer = Layer::map) const
   {
-    return tileset_;
+    size_t index = x + size_.w() * y;
+
+    switch (layer)
+    {
+      case Layer::map: return mapTiles_.at(index);
+      case Layer::track: return trackTiles_.at(index);
+      case Layer::object: return objectTiles_.at(index);
+    }
+  }
+
+  size_t& at(size_t x, size_t y, Layer layer = Layer::map)
+  {
+    size_t index = x + size_.w() * y;
+
+    switch (layer)
+    {
+      case Layer::map: return mapTiles_.at(index);
+      case Layer::track: return trackTiles_.at(index);
+      case Layer::object: return objectTiles_.at(index);
+    }
+  }
+
+  const Tileset& getTileset(Layer layer) const
+  {
+    switch (layer)
+    {
+      case Layer::map: return mapTileset_;
+      case Layer::track: return trackTileset_;
+      case Layer::object: return objectTileset_;
+    }
   }
 
   texture_ptr render(SDL_Renderer* ren, Layer layer) const;
@@ -42,8 +78,14 @@ public:
 private:
 
   vec2s size_;
-  std::vector<size_t> tiles_;
-  Tileset tileset_;
+
+  std::vector<size_t> mapTiles_;
+  std::vector<size_t> trackTiles_;
+  std::vector<size_t> objectTiles_;
+
+  Tileset mapTileset_;
+  Tileset trackTileset_;
+  Tileset objectTileset_;
 };
 
 #endif /* end of include guard: LEVEL_H_678CFCCF */
@@ -39,13 +39,13 @@ int main(int argc, char** argv)
     throw sdl_error();
   }
 
-  Level level;
+  Level level(ren.get());
 
   std::unique_ptr<State> state;
 
   if (argc == 2 && !strcmp(argv[1], "--editor"))
   {
-    state.reset(new Editor());
+    state.reset(new Editor(ren.get()));
   } else {
     state.reset(new Simulation(level));
   }
@@ -63,20 +63,12 @@ int main(int argc, char** argv)
 
     while (SDL_PollEvent(&e))
     {
-      if (e.type == SDL_QUIT)
+      if (e.type == SDL_QUIT ||
+            (e.type == SDL_KEYDOWN &&
+             e.key.keysym.sym == SDLK_ESCAPE))
       {
         quit = true;
-      } else if (e.type == SDL_KEYDOWN)
-      {
-        switch (e.key.keysym.sym)
-        {
-          case SDLK_ESCAPE:
-          {
-            quit = true;
-
-            break;
-          }
-        }
+        break;
       }
     }
 
@@ -342,7 +342,7 @@ bool Simulation::moveEntityOnGrid(
     }
   }
 
-  if (!level_.getTileset().canEntityMoveTo(
+  if (!level_.getTileset(Layer::map).canEntityMoveTo(
         entity.colliderType,
         level_.at(shouldMoveTo)))
   {
@@ -1,15 +1,53 @@
 #ifndef TILESET_H_B89AE7A1
 #define TILESET_H_B89AE7A1
 
+#include <string>
+#include "renderer.h"
 #include "enums.h"
+#include "consts.h"
 
 class Tileset {
 public:
 
+  Tileset(SDL_Renderer* ren, std::string filename)
+  {
+    surface_ptr surf(IMG_Load(("../res/" + filename).c_str()));
+
+    if (!surf)
+    {
+      throw img_error();
+    }
+
+    image_.reset(SDL_CreateTextureFromSurface(ren, surf.get()));
+    size_ = { surf->w, surf->h };
+    numTiles_ = size_.h() / TILE_SIZE.h();
+  }
+
   bool canEntityMoveTo(ColliderType collider, size_t tile) const
   {
     return true;
   }
+
+  const texture_ptr& getImage() const
+  {
+    return image_;
+  }
+
+  const vec2i& getSize() const
+  {
+    return size_;
+  }
+
+  size_t getNumTiles() const
+  {
+    return numTiles_;
+  }
+
+private:
+
+  texture_ptr image_;
+  vec2i size_;
+  size_t numTiles_;
 };
 
 #endif /* end of include guard: TILESET_H_B89AE7A1 */