add fading, fix sounds

1 files changed, 29 insertions, 1 deletions

diff --git a/src/sdl/draw.c b/src/sdl/draw.c
index d95e83f..e980131 100644
--- a/src/sdl/draw.c
+++ b/src/sdl/draw.c
@@ -11,6 +11,7 @@
 #define M_2_PI (2.0 * 3.1415926)
 
 #define BUMP_TIME 300
+#define FADE_TIME 200
 
 static size_t
 get_cell_size(
@@ -297,7 +298,6 @@ draw_solve_moves_text(
   draw_text(draw_ctx->renderer, draw_ctx->font, style, buf);
 }
 
-
 static void
 draw_bg(
   draw_ctx_t * const draw_ctx
@@ -320,6 +320,31 @@ draw_bg(
   SDL_RenderClear(draw_ctx->renderer);
 }
 
+static void
+draw_fade(
+  draw_ctx_t * const draw_ctx
+) {
+  // check timestamp
+  if (SDL_TICKS_PASSED(draw_ctx->ticks, draw_ctx->fade_ticks + FADE_TIME)) {
+    return;
+  }
+
+  // calculate alpha mod
+  const Uint32 delta = (draw_ctx->ticks - draw_ctx->fade_ticks);
+  const Uint8 alpha = 255 - 255.0 * delta / FADE_TIME;
+
+  // set alpha mod
+  if (SDL_SetTextureAlphaMod(draw_ctx->fade_tex, alpha)) {
+    die("SDL_TextureSetAlphaMod(): %s", SDL_GetError());
+  }
+  // SDL_Log("delta = %u, alpha = %d", delta, alpha);
+
+  // draw texture
+  if (SDL_RenderCopy(draw_ctx->renderer, draw_ctx->fade_tex, NULL, NULL)) {
+    die("SDL_RenderCopy(): %s", SDL_GetError());
+  }
+}
+
 void
 draw(
   draw_ctx_t * const draw_ctx
@@ -340,6 +365,9 @@ draw(
   draw_solve_wait_text(draw_ctx);
   draw_solve_moves_text(draw_ctx);
 
+  // draw fade overlay
+  draw_fade(draw_ctx);
+
   // flip
   SDL_RenderPresent(draw_ctx->renderer);
 }