Implemented circle transition effect (for exit area)

1 files changed, 54 insertions, 0 deletions

@@ -353,6 +353,60 @@ void Renderer::render(Game& game) {
     SDL_RenderFillRect(ren_.get(), nullptr);
   }
 
+  if (effects.isCircleTransitionActive()) {
+    if (effects.getCircleTransitionProgress() == 1.0) {
+      SDL_SetRenderTarget(ren_.get(), cameraTex.get());
+      SDL_SetRenderDrawBlendMode(ren_.get(), SDL_BLENDMODE_NONE);
+      SDL_SetRenderDrawColor(ren_.get(), 0, 0, 0, 255);
+      SDL_RenderClear(ren_.get());
+    } else {
+      texture_ptr circleEffectTex(
+        SDL_CreateTexture(
+          ren_.get(),
+          SDL_PIXELFORMAT_RGBA8888,
+          SDL_TEXTUREACCESS_TARGET,
+          CANVAS_WIDTH,
+          CANVAS_HEIGHT));
+
+      if (!circleEffectTex) {
+        throw sdl_error();
+      }
+
+      SDL_SetRenderTarget(ren_.get(), circleEffectTex.get());
+      SDL_SetRenderDrawBlendMode(ren_.get(), SDL_BLENDMODE_NONE);
+      SDL_SetRenderDrawColor(ren_.get(), 0, 0, 0, 255);
+      SDL_RenderClear(ren_.get());
+
+      int circleDiameter = 290 * (1.0 - effects.getCircleTransitionProgress());
+      SDL_Rect circleSize {
+        CANVAS_WIDTH / 2 - circleDiameter / 2,
+        CANVAS_HEIGHT / 2 - circleDiameter / 2,
+        circleDiameter,
+        circleDiameter
+      };
+
+      SDL_Rect copyFromCamera = circleSize;
+      if (circleDiameter > CANVAS_WIDTH) {
+        copyFromCamera.x = 0;
+        copyFromCamera.w = CANVAS_WIDTH;
+      }
+      if (circleDiameter > CANVAS_HEIGHT) {
+        copyFromCamera.y = 0;
+        copyFromCamera.h = CANVAS_HEIGHT;
+      }
+
+      SDL_RenderCopy(ren_.get(), cameraTex.get(), &copyFromCamera, &copyFromCamera);
+
+      int pinholeTexId = loadImageFromFile("../res/pinhole.png");
+      SDL_SetTextureBlendMode(textures_[pinholeTexId].get(), SDL_BLENDMODE_MOD);
+      SDL_RenderCopy(ren_.get(), textures_[pinholeTexId].get(), nullptr, &circleSize);
+
+      SDL_SetRenderTarget(ren_.get(), cameraTex.get());
+      SDL_SetTextureBlendMode(circleEffectTex.get(), SDL_BLENDMODE_NONE);
+      SDL_RenderCopy(ren_.get(), circleEffectTex.get(), nullptr, nullptr);
+    }
+  }
+
   if (game.getSystem<InputSystem>().isDebugConsoleOpen()) {
     // Not sure why I'm supposed to copy the cached texture to the screen
     // BEFORE rendering it, but we get flickering if we don't, so.