From 5239a89274fd69f3af4d1b1761b9bac9dff93ee5 Mon Sep 17 00:00:00 2001
From: Bill Niblock <bill@theinternetvagabond.com>
Date: Wed, 16 Oct 2024 17:58:27 -0400
Subject: [PATCH] Organize repo

---
 {pics => assets/textures/walls}/bluestone.png | Bin
 .../textures/walls}/colorstone.png            | Bin
 {pics => assets/textures/walls}/greystone.png | Bin
 {pics => assets/textures/walls}/mossy.png     | Bin
 .../textures/walls}/purplestone.png           | Bin
 {pics => assets/textures/walls}/redbrick.png  | Bin
 {pics => assets/textures/walls}/wood.png      | Bin
 pics/barrel.png                               | Bin 1132 -> 0 bytes
 pics/eagle.png                                | Bin 3530 -> 0 bytes
 pics/greenlight.png                           | Bin 393 -> 0 bytes
 pics/pillar.png                               | Bin 1535 -> 0 bytes
 ray-cast-vectors.fnl                          | 132 ------------------
 ray-cast.fnl                                  |  61 --------
 .../chatgpt/old-raycaster.fnl                 |   0
 .../lodev/lodev_floor-casting-example.cpp     |  57 ++++++++
 .../lodev/raycaster_flat.cpp                  |   0
 .../lodev/raycaster_textured.cpp              |   0
 .../min-love2d-fennel-readme.org              |   0
 .../love2d-fennel-project/sample-macros.fnl   |   0
 notes.md => reference/notes.md                |   0
 textures/walls/bluestone.png                  | Bin 2590 -> 0 bytes
 textures/walls/colorstone.png                 | Bin 3344 -> 0 bytes
 textures/walls/greystone.png                  | Bin 3680 -> 0 bytes
 textures/walls/mossy.png                      | Bin 4263 -> 0 bytes
 textures/walls/purplestone.png                | Bin 4422 -> 0 bytes
 textures/walls/redbrick.png                   | Bin 3051 -> 0 bytes
 textures/walls/wood.png                       | Bin 1388 -> 0 bytes
 27 files changed, 57 insertions(+), 193 deletions(-)
 rename {pics => assets/textures/walls}/bluestone.png (100%)
 rename {pics => assets/textures/walls}/colorstone.png (100%)
 rename {pics => assets/textures/walls}/greystone.png (100%)
 rename {pics => assets/textures/walls}/mossy.png (100%)
 rename {pics => assets/textures/walls}/purplestone.png (100%)
 rename {pics => assets/textures/walls}/redbrick.png (100%)
 rename {pics => assets/textures/walls}/wood.png (100%)
 delete mode 100755 pics/barrel.png
 delete mode 100755 pics/eagle.png
 delete mode 100755 pics/greenlight.png
 delete mode 100755 pics/pillar.png
 delete mode 100644 ray-cast-vectors.fnl
 delete mode 100644 ray-cast.fnl
 rename old-raycaster.fnl => reference/chatgpt/old-raycaster.fnl (100%)
 create mode 100644 reference/lodev/lodev_floor-casting-example.cpp
 rename raycaster_flat.cpp => reference/lodev/raycaster_flat.cpp (100%)
 rename raycaster_textured.cpp => reference/lodev/raycaster_textured.cpp (100%)
 rename min-love2d-fennel-readme.org => reference/love2d-fennel-project/min-love2d-fennel-readme.org (100%)
 rename sample-macros.fnl => reference/love2d-fennel-project/sample-macros.fnl (100%)
 rename notes.md => reference/notes.md (100%)
 delete mode 100755 textures/walls/bluestone.png
 delete mode 100755 textures/walls/colorstone.png
 delete mode 100755 textures/walls/greystone.png
 delete mode 100755 textures/walls/mossy.png
 delete mode 100755 textures/walls/purplestone.png
 delete mode 100755 textures/walls/redbrick.png
 delete mode 100755 textures/walls/wood.png

diff --git a/pics/bluestone.png b/assets/textures/walls/bluestone.png
similarity index 100%
rename from pics/bluestone.png
rename to assets/textures/walls/bluestone.png
diff --git a/pics/colorstone.png b/assets/textures/walls/colorstone.png
similarity index 100%
rename from pics/colorstone.png
rename to assets/textures/walls/colorstone.png
diff --git a/pics/greystone.png b/assets/textures/walls/greystone.png
similarity index 100%
rename from pics/greystone.png
rename to assets/textures/walls/greystone.png
diff --git a/pics/mossy.png b/assets/textures/walls/mossy.png
similarity index 100%
rename from pics/mossy.png
rename to assets/textures/walls/mossy.png
diff --git a/pics/purplestone.png b/assets/textures/walls/purplestone.png
similarity index 100%
rename from pics/purplestone.png
rename to assets/textures/walls/purplestone.png
diff --git a/pics/redbrick.png b/assets/textures/walls/redbrick.png
similarity index 100%
rename from pics/redbrick.png
rename to assets/textures/walls/redbrick.png
diff --git a/pics/wood.png b/assets/textures/walls/wood.png
similarity index 100%
rename from pics/wood.png
rename to assets/textures/walls/wood.png
diff --git a/pics/barrel.png b/pics/barrel.png
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diff --git a/ray-cast-vectors.fnl b/ray-cast-vectors.fnl
deleted file mode 100644
index 802ff9f..0000000
--- a/ray-cast-vectors.fnl
+++ /dev/null
@@ -1,132 +0,0 @@
-; Much of this is derived from https://lodev.org/cgtutor/raycasting.html
-(local pi math.pi)
-(love.graphics.setColor 1 1 1)
-(love.graphics.setNewFont 30)
-
-; Define map (0 is empty space, 1 is wall)
-(var map [[1 1 1 1 1 ]
-          [2 0 0 0 4 ]
-          [2 0 0 0 4 ]
-          [2 0 0 0 4 ]
-          [1 3 3 3 1 ]])
-
-; This sets the wall texture data
-(var walls [])
-(var wall-textures (love.filesystem.getDirectoryItems "textures/walls"))
-
-(each [_ v (ipairs wall-textures)]
-  (local wall {})
-  (tset wall :t (love.graphics.newImage (.. "textures/walls/" v)))
-  (tset wall :w (love.graphics.getWidth (. wall :t)))
-  (tset wall :h (love.graphics.getHeight (. wall :t)))
-  (table.insert walls wall))
-
-; Map size
-(var map-height (length map))
-(var map-width (length (. map 1)))
-
-; Player position and direction
-; pos{x,y}: position vector of the player
-; dir{x,y}: direction vector of the player
-; pln{x,y}: camera plane of the player
-(var player {:posx 3 :posy 3
-             :dirx -1 :diry 0
-             :plnx 0 :plny 0.66})
-
-; Screen size
-(var screen-width 1920)
-(var screen-height 1080)
-(var texel-width 64)
-(var texel-height 64)
-
-; Function to handle player movement
-(fn move-player [move-speed]
-  (let [new-x (+ player.posx (* (math.cos player.dir) move-speed))
-        new-y (+ player.y (* (math.sin player.dir) move-speed))]
-    ; Check for collisions with walls
-    (when (= (. map (math.floor new-y) (math.floor new-x)) 0)
-      (set player.x new-x)
-      (set player.y new-y))))
-
-; Function to handle player rotation
-(fn rotate-player [rot]
-  (local (o-dx o-px) (values player.dirx player.plnx))
-  (set player.dirx (- (* player.dirx (math.cos rot)) (* player.diry (math.sin rot))))
-  (set player.plnx (- (* player.plnx (math.cos rot)) (* player.plny (math.sin rot))))
-  (set player.diry (+ (* o-dx (math.sin rot)) (* player.diry (math.cos rot))))
-  (set player.plny (+ (* o-px (math.sin rot)) (* player.plny (math.cos rot))))
-)
-
-; Draw function for rendering
-{:draw (fn love.draw []
-  (love.graphics.clear)
-  
-  ; For each vertical slice of the screen
-  (for [i 0 (- screen-width 1)]
-    ; Setup a bunch of variables
-    ; Camera Space x-coordinate, kind of the ray position
-    (local cam-x (- (/ (* 2 i) screen-width) 1))
-    ; Ray direction vector values
-    (local (ray-dir-x ray-dir-y) (values (+ player.dirx (* player.plnx cam-x)) (+ player.diry (* player.plny cam-x)))) 
-    ; Current player position on the map grid
-    (var (map-x map-y) (values (math.floor player.posx) (math.floor player.posy)))
-    ; Length of ray from first x/y to the next x/y
-    (local (delta-dist-x delta-dist-y) (values 
-                                         (math.sqrt (+ 1 (/ (* ray-dir-y ray-dir-y) (* ray-dir-x ray-dir-x))))
-                                         (math.sqrt (+ 1 (/ (* ray-dir-x ray-dir-x) (* ray-dir-y ray-dir-y))))))
-    ; Side hit (n/s or e/w)
-    (var side nil)
-    ; Calculate step and distance from player to first x/y-side (as per Love graphics grid)
-    (var (step-x side-dist-x) (if (< ray-dir-x 0) 
-                                (values -1 (* (- player.posx map-x) delta-dist-x))
-                                (values 1 (* (- player.posx (+ map-x 1)) delta-dist-x))))
-    (var (step-y side-dist-y) (if (< ray-dir-y 0) 
-                                (values -1 (* (- player.posy map-y) delta-dist-y))
-                                (values 1 (* (- player.posy (+ map-y 1)) delta-dist-y))))
-    ; Shoot ze ray until it hits something
-    (var wall-hit false)
-    (while (not wall-hit)
-      (if (< side-dist-x side-dist-y)
-        (set (side-dist-x map-x side) (values (+ side-dist-x delta-dist-x) (+ map-x step-x) 0))
-        (set (side-dist-y map-y side) (values (+ side-dist-y delta-dist-y) (+ map-y step-y) 1)))
-      (set wall-hit (if (> (. map map-x map-y) 0) true false)))
-    ; Set the perpindicular length from the camera plane to the wall
-    (var ray-length (if (= side 0) (- side-dist-x delta-dist-x) (- side-dist-y delta-dist-y)))
-    ; Determine pixel-column height
-    (var line-height (math.floor (/ screen-height ray-length)))
-    (var (draw-start draw-end) (values (+ (/ (* -1 line-height) 2) (/ screen-height 2)) (+ (/ line-height 2) (/ screen-height 2))))
-    (if (< draw-start 0) (set draw-start 0))
-    (if (>= draw-end screen-height) (set draw-end (- screen-height 1)))
-    ; Determine exactly where along the wall the ray hits
-    (var wall-col (if (= side 0) (+ player.posy (* ray-length ray-dir-y)) (+ player.posx (* ray-length ray-dir-x))))
-    (set wall-col (- wall-col (math.floor wall-col)))
-    ; Select the texture data based on the grid number
-    (local wall-texture (. walls (. map map-x map-y)))
-    ; Calculate the part of the texture to paint, and then do so
-    (var texture-x (math.floor (* wall-col (. wall-texture :w))))
-    (if (and (= side 0) (> ray-dir-x 0)) (set texture-x (- (- (. wall-texture :w) texture-x) 1)))
-    (if (and (= side 1) (< ray-dir-y 0)) (set texture-x (- (- (. wall-texture :w) texture-x) 1)))
-    (love.graphics.setColor 1 1 1)
-    (love.graphics.draw (. wall-texture :t)
-                        (love.graphics.newQuad texture-x 0 1 (. wall-texture :h) (. wall-texture :w) (. wall-texture :h))
-                        i draw-start 0 1 (/ line-height (. wall-texture :h)))
-    ; Draw simple lines
-    ; (love.graphics.line i draw-start i draw-end)
-    (love.graphics.setColor 1 0 0)
-    (love.graphics.print (.. "player-x: " player.posx ", player-y:" player.posy) 50 300)
-    (love.graphics.print (.. "map-x: " map-x ", map-y:" map-y ", val:" (. map map-x map-y)) 50 330)
-    (love.graphics.print (.. "side: " side ", ray-length:" ray-length) 50 370)
-    (love.graphics.print (.. "step-x: " step-x ", step-y:" step-y) 50 400)
-    )
-  )
-
- :update (fn update [dt]
-      (when (love.keyboard.isDown "j") (rotate-player 0.1))
-      (when (love.keyboard.isDown "l") (rotate-player -0.1)))
-
- :keypressed (fn keypressed [key set-mode]
-      (when (= key "j") (rotate-player 0.05))
-      (when (= key "l") (rotate-player -0.05))
-      (when (= key "i") (move-player 1))
-      (when (= key "k") (move-player -1))
-      (when (= key "x") (love.event.quit)))}
diff --git a/ray-cast.fnl b/ray-cast.fnl
deleted file mode 100644
index 2b1ff9e..0000000
--- a/ray-cast.fnl
+++ /dev/null
@@ -1,61 +0,0 @@
-(local pi (math.pi))
-
-; Define map (0 is empty space, 1 is wall)
-(var map [[1 1 1 1 1]
-          [1 0 0 0 1]
-          [1 0 1 0 1]
-          [1 0 0 0 1]
-          [1 1 1 1 1]])
-
-; Map size
-(var map-width (length map))
-(var map-height (length (first map)))
-
-; Player position and direction
-(var player {:x 2.5 :y 2.5 :dir 0 :fov (/ pi 3)})
-
-; Screen size
-(var screen-width 640)
-(var screen-height 480)
-
-; Ray-casting function
-(fn cast-ray [ray-angle]
-  (local dx (math.cos ray-angle))
-  (local dy (math.sin ray-angle))
-  
-  (var distance 0)
-  (while true
-    (var ray-x (+ player.x (* dx distance)))
-    (var ray-y (+ player.y (* dy distance)))
-    
-    ; Check if ray hits a wall (1) on the map
-    (when (or (>= (math.floor ray-x) map-width)
-              (>= (math.floor ray-y) map-height)
-              (<= ray-x 0)
-              (<= ray-y 0)
-              (= (nth (nth map (math.floor ray-y)) (math.floor ray-x)) 1))
-      (return distance))
-    
-    ; Increment distance
-    (set distance (+ distance 0.01))))
-
-; Draw function for rendering
-(fn love.draw []
-  (love.graphics.clear)
-  
-  ; For each vertical slice of the screen
-  (for [i 0 (- screen-width 1)]
-    ; Calculate angle of ray relative to player direction
-    (local ray-angle (+ player.dir
-                        (- (* (/ i screen-width) player.fov) (/ player.fov 2))))
-    
-    ; Cast the ray to find distance to the nearest wall
-    (local distance (cast-ray ray-angle))
-    
-    ; Calculate height of the wall slice
-    (local wall-height (math.floor (/ screen-height distance)))
-    
-    ; Draw the wall slice (centered vertically)
-    (love.graphics.line i (/ (- screen-height wall-height) 2)
-                        i (/ (+ screen-height wall-height) 2))))
-
diff --git a/old-raycaster.fnl b/reference/chatgpt/old-raycaster.fnl
similarity index 100%
rename from old-raycaster.fnl
rename to reference/chatgpt/old-raycaster.fnl
diff --git a/reference/lodev/lodev_floor-casting-example.cpp b/reference/lodev/lodev_floor-casting-example.cpp
new file mode 100644
index 0000000..8957c65
--- /dev/null
+++ b/reference/lodev/lodev_floor-casting-example.cpp
@@ -0,0 +1,57 @@
+//FLOOR CASTING
+for(int y = 0; y < h; y++)
+{
+  // rayDir for leftmost ray (x = 0) and rightmost ray (x = w)
+  float rayDirX0 = dirX - planeX;
+  float rayDirY0 = dirY - planeY;
+  float rayDirX1 = dirX + planeX;
+  float rayDirY1 = dirY + planeY;
+
+  // Current y position compared to the center of the screen (the horizon)
+  int p = y - screenHeight / 2;
+
+  // Vertical position of the camera.
+  float posZ = 0.5 * screenHeight;
+
+  // Horizontal distance from the camera to the floor for the current row.
+  // 0.5 is the z position exactly in the middle between floor and ceiling.
+  float rowDistance = posZ / p;
+
+  // calculate the real world step vector we have to add for each x (parallel to camera plane)
+  // adding step by step avoids multiplications with a weight in the inner loop
+  float floorStepX = rowDistance * (rayDirX1 - rayDirX0) / screenWidth;
+  float floorStepY = rowDistance * (rayDirY1 - rayDirY0) / screenWidth;
+
+  // real world coordinates of the leftmost column. This will be updated as we step to the right.
+  float floorX = posX + rowDistance * rayDirX0;
+  float floorY = posY + rowDistance * rayDirY0;
+
+  for(int x = 0; x < screenWidth; ++x)
+  {
+    // the cell coord is simply got from the integer parts of floorX and floorY
+    int cellX = (int)(floorX);
+    int cellY = (int)(floorY);
+
+    // get the texture coordinate from the fractional part
+    int tx = (int)(texWidth * (floorX - cellX)) & (texWidth - 1);
+    int ty = (int)(texHeight * (floorY - cellY)) & (texHeight - 1);
+
+    floorX += floorStepX;
+    floorY += floorStepY;
+
+    // choose texture and draw the pixel
+    int floorTexture = 3;
+    int ceilingTexture = 6;
+    Uint32 color;
+
+    // floor
+    color = texture[floorTexture][texWidth * ty + tx];
+    color = (color >> 1) & 8355711; // make a bit darker
+    buffer[y][x] = color;
+
+    //ceiling (symmetrical, at screenHeight - y - 1 instead of y)
+    color = texture[ceilingTexture][texWidth * ty + tx];
+    color = (color >> 1) & 8355711; // make a bit darker
+    buffer[screenHeight - y - 1][x] = color;
+  }
+}
diff --git a/raycaster_flat.cpp b/reference/lodev/raycaster_flat.cpp
similarity index 100%
rename from raycaster_flat.cpp
rename to reference/lodev/raycaster_flat.cpp
diff --git a/raycaster_textured.cpp b/reference/lodev/raycaster_textured.cpp
similarity index 100%
rename from raycaster_textured.cpp
rename to reference/lodev/raycaster_textured.cpp
diff --git a/min-love2d-fennel-readme.org b/reference/love2d-fennel-project/min-love2d-fennel-readme.org
similarity index 100%
rename from min-love2d-fennel-readme.org
rename to reference/love2d-fennel-project/min-love2d-fennel-readme.org
diff --git a/sample-macros.fnl b/reference/love2d-fennel-project/sample-macros.fnl
similarity index 100%
rename from sample-macros.fnl
rename to reference/love2d-fennel-project/sample-macros.fnl
diff --git a/notes.md b/reference/notes.md
similarity index 100%
rename from notes.md
rename to reference/notes.md
diff --git a/textures/walls/bluestone.png b/textures/walls/bluestone.png
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