From 28fda4551d901a1f5dca24cb9bd84728c6a29e12 Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Fri, 4 Jul 2025 19:15:34 -0500
Subject: [PATCH] background color animation

---
 src/scene/tracker/cover.cpp     | 40 +++++++++++++++++++++++++++++----
 src/scene/tracker/scene.cpp     |  4 ++--
 src/scene/tracker/tracklist.cpp |  2 +-
 3 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/src/scene/tracker/cover.cpp b/src/scene/tracker/cover.cpp
index d3f0159..c9466d1 100644
--- a/src/scene/tracker/cover.cpp
+++ b/src/scene/tracker/cover.cpp
@@ -5,6 +5,9 @@
 #include "texture.hpp"
 #include "framebuffer.hpp"
 
+#include "holly/background.hpp"
+#include "holly/holly.hpp"
+
 namespace scene::tracker::cover {
 
   struct cover {
@@ -15,11 +18,14 @@ namespace scene::tracker::cover {
     float width;
     float height;
     float scale;
+    vec3 color;
   };
 
   int cover_ix = -1;
 
-  float zoom_interp = 0.0;
+  static float zoom_interp = 0.0;
+
+  static vec3 bg_color = {0, 0, 0};
 
   static const cover covers[] = {
     [thebeach] = {
@@ -31,6 +37,7 @@ namespace scene::tracker::cover {
       .width = 72,
       .height = 72,
       .scale = 6,
+      .color = {0x1a, 0x13, 0x11},
     },
     [silvertrees] = {
       .texture_offset = texture::offset::silvertrees,
@@ -41,6 +48,7 @@ namespace scene::tracker::cover {
       .width = 72,
       .height = 72,
       .scale = 6,
+      .color = {0x0d, 0x10, 0x1a},
     },
     [redtree] = {
       .texture_offset = texture::offset::redtree,
@@ -51,6 +59,7 @@ namespace scene::tracker::cover {
       .width = 72,
       .height = 72,
       .scale = 6,
+      .color = {0x1a, 0x00, 0x00},
     },
     [mountain] = {
       .texture_offset = texture::offset::mountain,
@@ -61,6 +70,7 @@ namespace scene::tracker::cover {
       .width = 72,
       .height = 72,
       .scale = 6,
+      .color = {0x00, 0x02, 0x1a},
     },
     [mossycottage] = {
       .texture_offset = texture::offset::mossycottage,
@@ -71,6 +81,7 @@ namespace scene::tracker::cover {
       .width = 72,
       .height = 72,
       .scale = 6,
+      .color = {0x0f, 0x1a, 0x14},
     },
     [clocks] = {
       .texture_offset = texture::offset::clocks,
@@ -81,6 +92,7 @@ namespace scene::tracker::cover {
       .width = 72,
       .height = 72,
       .scale = 6,
+      .color = {0x00, 0x0a, 0x1a},
     },
     [tree] = {
       .texture_offset = texture::offset::tree,
@@ -91,6 +103,7 @@ namespace scene::tracker::cover {
       .width = 72,
       .height = 72,
       .scale = 6,
+      .color = {0x0d, 0x1a, 0x0e},
     },
   };
 
@@ -158,19 +171,36 @@ namespace scene::tracker::cover {
 
   const static float alpha = 207;
 
-  void draw_shroud(ta_parameter_writer& writer)
+  void draw_shroud(ta_parameter_writer& writer, const cover& cover)
   {
     global_polygon_translucent(writer);
 
     uint32_t a = ((uint32_t)(zoom_interp * alpha)) << 24;
     float z = 1.0 / 3.5f;
 
+    const vec3& bg = cover.color;
+    int color = (((int)bg.x) << 24) | (((int)bg.y) << 8) | (((int)bg.z) << 0);
+
     quad_type_0(writer,
                 {0, 0, z},
                 {(float)framebuffer.px_width, 0, z},
                 {(float)framebuffer.px_width, (float)framebuffer.px_height, z},
                 {0, (float)framebuffer.px_height, z},
-                a | 0x202020);
+                a | color);
+  }
+
+  void update_background(const cover& cover)
+  {
+    vec3 newbg = lerp(bg_color, cover.color, 0.005);
+
+    if (newbg.x != bg_color.x || newbg.y != bg_color.y || newbg.z != bg_color.z) {
+      bg_color = newbg;
+      int color = (((int)newbg.x) << 24) | (((int)newbg.y) << 8) | (((int)newbg.z) << 0);
+
+      background_parameter2(texture_memory_alloc.background[1].start,
+                            color);
+      holly.VO_BORDER_COL = color;
+    }
   }
 
   void draw(ta_multiwriter& multi, float x, float y, bool zoom)
@@ -180,6 +210,8 @@ namespace scene::tracker::cover {
 
     const cover& cover = covers[cover_ix];
 
+    update_background(cover);
+
     uint32_t texture_size = cover.texture_size
                           | tsp_instruction_word::dst_alpha_instr::zero;
 
@@ -231,6 +263,6 @@ namespace scene::tracker::cover {
                 base_color);
 
     if (zoom_interp > 0)
-      draw_shroud(multi.op);
+      draw_shroud(multi.op, cover);
   }
 }
diff --git a/src/scene/tracker/scene.cpp b/src/scene/tracker/scene.cpp
index 065e9a9..c9a4057 100644
--- a/src/scene/tracker/scene.cpp
+++ b/src/scene/tracker/scene.cpp
@@ -177,8 +177,8 @@ namespace scene::tracker {
   void init()
   {
     background_parameter2(texture_memory_alloc.background[1].start,
-                          0x110012);
-    holly.VO_BORDER_COL = 0x110012;
+                          0x000000);
+    holly.VO_BORDER_COL = 0x000000;
 
     ::scene::options::init();
 
diff --git a/src/scene/tracker/tracklist.cpp b/src/scene/tracker/tracklist.cpp
index dcbe9ff..f33ab7b 100644
--- a/src/scene/tracker/tracklist.cpp
+++ b/src/scene/tracker/tracklist.cpp
@@ -78,7 +78,7 @@ namespace scene::tracker::tracklist {
 
       transfer_string(writer, (const char *)interpreter::state.xm.instrument_header[i]->instrument_name,
                       x+1, y+1, 1.0 / 11.0,
-                      0x444444);
+                      0x000000);
       y += glyph::vert_advance + 1;
     }
   }