From a634519a163e6bbf763fbc9f7491c20e01cae5b5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <drummyfish@disroot.org>
Date: Sat, 14 Nov 2020 12:01:49 +0100
Subject: [PATCH] Fix visibility

---
 game.h     | 15 +++++++++++++--
 index.html |  3 ++-
 main_sdl.c |  8 +++++++-
 settings.h | 34 +++++++++++++++++++++++++++++++++-
 4 files changed, 55 insertions(+), 5 deletions(-)

diff --git a/game.h b/game.h
index 06374df..81397d5 100755
--- a/game.h
+++ b/game.h
@@ -353,7 +353,8 @@ struct
   uint8_t soundsPlayedThisFrame; /**< Each bit says whether given sound was
                                     played this frame, prevents playing too many
                                     sounds at once. */
-  RCL_RayConstraints rayConstraints;
+  RCL_RayConstraints rayConstraints; ///< Ray constraints for rendering.
+  RCL_RayConstraints visibilityRayConstraints; ///< Constraints for visibility.
   uint8_t keyStates[SFG_KEY_COUNT]; /**< Pressed states of keys, each value
                                     stores the number of frames for which the
                                     key has been held. */
@@ -1662,6 +1663,12 @@ void SFG_init()
   SFG_game.rayConstraints.maxHits = SFG_RAYCASTING_MAX_HITS;
   SFG_game.rayConstraints.maxSteps = SFG_RAYCASTING_MAX_STEPS;
 
+  RCL_initRayConstraints(&SFG_game.visibilityRayConstraints);
+  SFG_game.visibilityRayConstraints.maxHits = 
+    SFG_RAYCASTING_VISIBILITY_MAX_HITS;
+  SFG_game.visibilityRayConstraints.maxSteps =
+    SFG_RAYCASTING_VISIBILITY_MAX_STEPS;
+
   SFG_game.antiSpam = 0;
 
   SFG_LOG("computing average texture colors")
@@ -1734,6 +1741,10 @@ void SFG_init()
     SFG_game.save[0] = SFG_NUMBER_OF_LEVELS - 1; // revealed all levels
   }
 
+#if SFG_ALL_LEVELS
+  SFG_game.save[0] = SFG_NUMBER_OF_LEVELS - 1;
+#endif
+
   SFG_setMusic((SFG_game.settings & 0x02) ?
     SFG_MUSIC_TURN_ON : SFG_MUSIC_TURN_OFF);
 
@@ -2868,7 +2879,7 @@ static inline uint8_t SFG_spriteIsVisible(RCL_Vector2D pos, RCL_Unit height,
       height,
       SFG_floorHeightAt,
       SFG_ceilingHeightAt,
-      SFG_game.rayConstraints
+      SFG_game.visibilityRayConstraints
     ) == RCL_UNITS_PER_SQUARE;
 }
 
diff --git a/index.html b/index.html
index bf5f3b8..adcd5d2 100644
--- a/index.html
+++ b/index.html
@@ -257,12 +257,13 @@
 
     <ul>
       <li><a href="">GNU/Linux SDL</a></li>
+      <li><a href="">GNU/Linux SDL LQ</a></li>
       <li><a href="">GNU/Linux CSFML</a></li>
       <li><a href="">play in browser</a></li>
       <li><a href="">Pokitto</a></li>
       <li><a href="">GB Meta</a></li>
       <li><a href="">M$ Win$hit XP SDL</a></li>
-      <li><a href="">source code</a></li>
+      <li><a href="https://gitlab.com/drummyfish/anarch/-/archive/master/anarch-master.zip">source code</a></li>
     </ul>
 
     <h2>Explore</h2>
diff --git a/main_sdl.c b/main_sdl.c
index 3afeb4d..bdd0fd3 100644
--- a/main_sdl.c
+++ b/main_sdl.c
@@ -26,11 +26,13 @@
 
 //  #define SFG_START_LEVEL 1
   #define SFG_IMMORTAL 1
-  #define SFG_UNLOCK_DOOR 1
+  #define SFG_ALL_LEVELS 1
+//  #define SFG_UNLOCK_DOOR 1
 //  #define SFG_REVEAL_MAP 1
 //  #define SFG_INFINITE_AMMO 1
 // #define SFG_TIME_MULTIPLIER 512
 // #define SFG_CPU_LOAD(percent) printf("CPU load: %d%\n",percent);
+#define GAME_LQ
 
 #ifndef __EMSCRIPTEN__
   #ifndef GAME_LQ
@@ -53,6 +55,8 @@
     #define SFG_DIMINISH_SPRITES 0
     #define SFG_DITHERED_SHADOW 0
     #define SFG_BACKGROUND_BLUR 0
+    #define SFG_RAYCASTING_MAX_STEPS 20
+    #define SFG_RAYCASTING_MAX_HITS 8
   #endif
 #else
   // emscripten
@@ -63,6 +67,8 @@
   #define SFG_RESOLUTION_SCALEDOWN 2
   #define SFG_DITHERED_SHADOW 1
   #define SFG_BACKGROUND_BLUR 0
+  #define SFG_RAYCASTING_MAX_STEPS 20
+  #define SFG_RAYCASTING_MAX_HITS 8
 
   #include <emscripten.h>
 #endif
diff --git a/settings.h b/settings.h
index fb63bec..ae75a6d 100644
--- a/settings.h
+++ b/settings.h
@@ -164,6 +164,30 @@
   #define SFG_RAYCASTING_MAX_HITS 10
 #endif
 
+/**
+  Same as SFG_RAYCASTING_MAX_STEPS but for visibility rays that are used to
+  check whether sprites are visible etc.
+*/
+#ifndef SFG_RAYCASTING_VISIBILITY_MAX_STEPS
+  #if SFG_RAYCASTING_MAX_STEPS < 15
+    #define SFG_RAYCASTING_VISIBILITY_MAX_STEPS 15
+  #else
+    #define SFG_RAYCASTING_VISIBILITY_MAX_STEPS SFG_RAYCASTING_MAX_STEPS
+  #endif
+#endif
+
+/**
+  Same as SFG_RAYCASTING_MAX_HITS but for visibility rays that are used to check
+  whether sprites are visible etc.
+*/
+#ifndef SFG_RAYCASTING_VISIBILITY_MAX_HITS
+  #if SFG_RAYCASTING_MAX_HITS < 6
+    #define SFG_RAYCASTING_VISIBILITY_MAX_HITS 6
+  #else
+    #define SFG_RAYCASTING_VISIBILITY_MAX_HITS SFG_RAYCASTING_MAX_HITS
+  #endif
+#endif
+
 /**
   How many times rendering should be subsampled horizontally. Bigger number
   can significantly improve performance (by casting fewer rays), but can look
@@ -396,7 +420,8 @@
   look weirdly scaled, so this option can be used to fix that.
 */
 #ifndef SFG_SPRITE_MAX_SIZE
-  #define SFG_SPRITE_MAX_SIZE SFG_SCREEN_RESOLUTION_Y
+  #define SFG_SPRITE_MAX_SIZE \
+    (SFG_SCREEN_RESOLUTION_Y / SFG_RESOLUTION_SCALEDOWN)
 #endif
 
 /**
@@ -422,6 +447,13 @@
   #define SFG_IMMORTAL 0
 #endif
 
+/**
+  Reveals all levels to be played.
+*/
+#ifndef SFG_ALL_LEVELS
+  #define SFG_ALL_LEVELS 0
+#endif
+
 /**
   Turn on for previes mode for map editing (flying, noclip, fast movement etc.).
 */