From 7092dfee462d14061875ba175a7e81cbc6849d02 Mon Sep 17 00:00:00 2001
From: "Daniele Verducci (Slimpenguin)" <daniele.verducci@gmail.com>
Date: Fri, 6 Jan 2023 11:26:47 +0100
Subject: [PATCH] Multiple textures

---
 v2/raycaster.py | 58 +++++++++++++++++++++++++++++++++----------------
 1 file changed, 39 insertions(+), 19 deletions(-)

diff --git a/v2/raycaster.py b/v2/raycaster.py
index dc9eb0d..a0255cd 100755
--- a/v2/raycaster.py
+++ b/v2/raycaster.py
@@ -26,14 +26,14 @@ MAP = [
 	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 2, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 2, 0, 0, 1,
+	1, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 0, 0, 1,
 	1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1,
 	1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1,
 	1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1,
@@ -43,15 +43,27 @@ MAP = [
 MAP_SIZE = 16
 DOF = 2*MAP_SIZE	# Depth Of Field
 
-TEXTURE = [
-	1, 1, 1, 1, 1, 1, 1, 1,
-	1, 1, 0, 0, 0, 0, 0, 1,
-	1, 0, 1, 0, 0, 0, 0, 1,
-	1, 0, 0, 1, 0, 0, 0, 1,
-	1, 0, 0, 0, 1, 0, 0, 1,
-	1, 0, 0, 0, 0, 1, 0, 1,
-	1, 0, 0, 0, 0, 0, 1, 1,
-	1, 1, 1, 1, 1, 1, 1, 1,
+TEXTURES = [
+	[
+		0, 0, 0, 0, 0, 0, 0, 0,
+		0, 0, 1, 1, 1, 1, 1, 0,
+		0, 1, 0, 1, 1, 1, 1, 0,
+		0, 1, 1, 0, 1, 1, 1, 0,
+		0, 1, 1, 1, 0, 1, 1, 0,
+		0, 1, 1, 1, 1, 0, 1, 0,
+		0, 1, 1, 1, 1, 1, 0, 0,
+		0, 0, 0, 0, 0, 0, 0, 0,
+	],
+	[
+		1, 1, 1, 0, 0, 1, 1, 1,
+		1, 1, 0, 1, 1, 0, 1, 1,
+		1, 0, 1, 1, 1, 1, 0, 1,
+		0, 1, 1, 1, 1, 1, 1, 0,
+		0, 1, 1, 1, 1, 1, 1, 0,
+		1, 0, 1, 1, 1, 1, 0, 1,
+		1, 1, 0, 1, 1, 0, 1, 1,
+		1, 1, 1, 0, 0, 1, 1, 1,
+	],
 ]
 TEXTURE_SIZE = 8
 
@@ -178,7 +190,7 @@ class Main:
 			posX = i % MAP_SIZE * MAP_SCALE
 			posY = math.floor(i / MAP_SIZE) * MAP_SCALE
 			color = 0
-			if MAP[i] == 1:
+			if MAP[i] > 0:
 				color = 255
 			sdl2.ext.draw.fill(self.mapSurface, sdl2.ext.Color(color,color,color,255), (posX, posY, MAP_SCALE - 1, MAP_SCALE - 1))
 
@@ -194,6 +206,10 @@ class Main:
 			if rayAngle > math.pi * 2:
 				rayAngle = rayAngle - math.pi * 2
 
+			# Which map wall tiles have been hit by rayX and rayY
+			mapBlockHitX = 0
+			mapBlockHitY = 0
+
 			# Check horizontal lines
 			dof = 0 # Depth of field
 			if rayAngle == 0 or rayAngle == math.pi:
@@ -223,6 +239,7 @@ class Main:
 				mapArrayPosition = mapY * MAP_SIZE + mapX
 				if mapArrayPosition >= 0 and mapArrayPosition < MAP_SIZE*MAP_SIZE and MAP[mapArrayPosition] != 0:
 					dof = DOF	# Hit the wall: we are done, no need to do other checks
+					mapBlockHitY = MAP[mapArrayPosition]	# Save which map wall tile we reached
 				else:
 					# Didn't hit the wall: check successive horizontal line
 					rayX = rayX + xOffset
@@ -264,6 +281,7 @@ class Main:
 				mapArrayPosition = mapY * MAP_SIZE + mapX
 				if mapArrayPosition >= 0 and mapArrayPosition < MAP_SIZE*MAP_SIZE-1 and MAP[mapArrayPosition] != 0:
 					dof = DOF	# Hit the wall: we are done, no need to do other checks
+					mapBlockHitX = MAP[mapArrayPosition]	# Save which map wall tile we reached
 				else:
 					# Didn't hit the wall: check successive horizontal line
 					rayX = rayX + xOffset
@@ -297,13 +315,15 @@ class Main:
 				textureSegmentEnd = textureSegmentStart + textureSegmentLength
 				# Obtain texture value in the pixel representing the current segment and calculate shading
 				if vertDist > horizDist:
+					texIndex = mapBlockHitY - 1	# The texture covering the selected map tile (0 is no texture, 1 is texture at TEXTURES[0] etc)
 					texColumn = int(rayX / (MAP_SCALE / TEXTURE_SIZE) % TEXTURE_SIZE)
 					shading = 127
 				else:
+					texIndex = mapBlockHitX - 1	# The texture covering the selected map tile
 					texColumn = int(rayY / (MAP_SCALE / TEXTURE_SIZE) % TEXTURE_SIZE)
 					shading = 255
 
-				texel = TEXTURE[texColumn + textureColumnPixel * TEXTURE_SIZE]
+				texel = TEXTURES[texIndex][texColumn + textureColumnPixel * TEXTURE_SIZE]
 				# Calculate color resulting from texture pixel value + shading
 				color = sdl2.ext.Color(texel*shading,texel*shading,texel*shading,255)
 				# Clipping