From d7194d9183075252790482e77a7e28f964c32326 Mon Sep 17 00:00:00 2001
From: Miloslav Ciz <drummyfish@disroot.org>
Date: Tue, 12 Sep 2023 17:39:55 +0200
Subject: [PATCH] Draw sky

---
 game.h     | 62 ++++++++++++++++++++++++------------------------------
 settings.h |  5 +++--
 2 files changed, 31 insertions(+), 36 deletions(-)

diff --git a/game.h b/game.h
index d2c0495..6525ddd 100644
--- a/game.h
+++ b/game.h
@@ -118,21 +118,21 @@ void LCR_gameEnd(void)
 
 void LCR_drawSkyStrip(int verticalOffset, uint8_t horizontalOffset)
 {
-
 #if LCR_SETTING_SKY_SIZE != 0
-
   verticalOffset -= (LCR_SETTING_SKY_SIZE * LCR_SKY_IMAGE_SIZE) / 2; 
 
   int finalY = verticalOffset + LCR_SETTING_SKY_SIZE * LCR_SKY_IMAGE_SIZE;
 
+  finalY = (finalY / LCR_SETTING_SKY_SIZE) * LCR_SETTING_SKY_SIZE;
+
   if (finalY >= LCR_EFFECTIVE_RESOLUTION_Y)
     finalY = LCR_EFFECTIVE_RESOLUTION_Y - 1;
 
-  unsigned int skyY = 0;
+  const uint16_t *skyLine = LCR_skyImages + 256;
 
   if (verticalOffset < 0)
   {
-    skyY = -1 * verticalOffset;
+    skyLine += (-1 * verticalOffset / LCR_SETTING_SKY_SIZE) * (LCR_SKY_IMAGE_SIZE / 2);
     verticalOffset = 0;
   }
 
@@ -140,49 +140,43 @@ void LCR_drawSkyStrip(int verticalOffset, uint8_t horizontalOffset)
   {
     for (int i = 0; i < LCR_EFFECTIVE_RESOLUTION_X; ++i)
     {
-      LCR_drawPixelUnsafe(x,y,10000); 
+      // TODO: check z-buffer
+
+      int offsetX = (i / LCR_SETTING_SKY_SIZE + horizontalOffset)
+        % LCR_SKY_IMAGE_SIZE;
+
+      uint16_t pixel = *(skyLine + offsetX / 2);
+
+      pixel = offsetX % 2 ? (pixel >> 8) : (pixel & 0x00ff);
+
+      LCR_drawPixelUnsafe(i,verticalOffset,LCR_skyImages[pixel]); 
     }
 
-    skyY++;
     verticalOffset++;
+
+    if (verticalOffset % LCR_SETTING_SKY_SIZE == 0)
+      skyLine += LCR_SKY_IMAGE_SIZE / 2;
   }
 
 #endif
-
-
-
-
-/*
-  const uint16_t *pixel = LCR_skyImages + 256;
-  uint8_t odd = 1;
-
-  for (int y = 0; y < 128; ++y)
-    for (int x = 0; x < 128; ++x)
-    {
-      LCR_drawPixelUnsafe(x,y, 
-        LCR_skyImages[   
-          odd ?  (*pixel & 0x00ff) : (*pixel >> 8)  ]
-
-        );      
-
-      if (odd)
-        odd = 0;
-      else
-      {
-        odd = 1;
-        pixel++;
-      }
-    }
-*/
-
 }
 
+int aaa = 0;
+
 uint8_t LCR_gameStep(uint32_t time)
 {
+
+for (int i = 0; i < LCR_EFFECTIVE_RESOLUTION_X; ++i)
+  for (int j = 0; j < LCR_EFFECTIVE_RESOLUTION_Y; ++j)
+    LCR_drawPixelUnsafe(i,j,0);
+
   for (int i = 0; i < LCR_KEYS_TOTAL; ++i)
     _LCR_keyStates[i] = LCR_keyPressed(i);
 
-  LCR_drawSkyStrip();
+  LCR_drawSkyStrip(200 + aaa / 10,aaa / 30);
+
+
+aaa = (aaa + 1) % 10000;
 
   return 1;
 }
diff --git a/settings.h b/settings.h
index 3a7c480..8df1561 100644
--- a/settings.h
+++ b/settings.h
@@ -15,8 +15,9 @@
 
 #ifndef LCR_SETTING_SKY_SIZE
   /** Size of sky texture pixel, 0 turns off sky rendering. */
-  #define LCR_SETTING_SKY_SIZE 1
-#define
+  #define LCR_SETTING_SKY_SIZE \
+    (LCR_SETTING_RESOLUTION_X / 256 * LCR_SETTING_RESOLUTION_SUBDIVIDE)
+#endif
 
 #ifndef LCR_SETTING_MAP_MAX_SIZE
   /** Maximum number of blocks a map can consist of, decreasing will save RAM