Added player struct. Multiple chunks, and player interaction updates to support them.

README.md

@@ -1,7 +1,7 @@
 # voxelThing
 Jake's Raylib Minecraft Clone
 
-Implements a voxel chunk renderer. Chunks are stored as a 3D array of block struct elements which define block types and later other block data. The chunk is converted to a mesh such that only faces exposed to air blocks or the chunk boarders are rendered.
+Renders a voxel world in chunks.
 
 Code is rough and messy and not much is implemented yet.
 

include/blockTypes.h

@@ -1,6 +1,6 @@
 // blockTypes.h
 #ifndef BLOCK_TYPES_H
-#define BLOCKTYPES_H
+#define BLOCK_TYPES_H
 
 // Definitions for Block IDs (notes are texture atlas indicies)
 #define BLOCK_AIR 0        // No texture.

include/chunkIO.h

@@ -0,0 +1,11 @@
+// chunkIO.h
+#ifndef CHUNK_IO_H
+#define CHUNK_IO_H
+
+#include <stdbool.h>
+#include "chunkStructures.h"
+
+bool SaveChunk(const Chunk *chunk);
+bool LoadChunk(Chunk *chunk);
+
+#endif

include/chunkStructures.h

@@ -18,6 +18,9 @@ typedef struct {
     Block blocks[CHUNK_SIZE_X][CHUNK_SIZE_Y][CHUNK_SIZE_Z];
     Mesh mesh; // Owned by the chunk, valid only at runtime
     bool hasMesh; //
+    bool hasChanged; // Flag that determines if chunk needs to be saved on unload
+    int x;
+    int z;
 } Chunk;
 
 // 6 directions for checking neighbors: +/-X, +/-Y, +/-Z
@@ -36,10 +39,6 @@ int IsBlockFaceExposed(Chunk *chunk, int x, int y, int z, int dir);
 // Function that places a tree dumbly.
 void PlaceTreeAt(Chunk *chunk, int x, int y, int z) ;
 
-// Save chunk to disk.
+void InitChunk(Chunk *chunk, int chunkX, int chunkZ);
-bool SaveChunk(const Chunk *chunk, const char *filename);
-
-// Load chunk from disk.
-bool LoadChunk(Chunk *chunk, const char *filename);
 
 #endif

include/playerController.h

@@ -4,6 +4,7 @@
 
 #include "raylib.h"
 #include "chunkStructures.h"
+#include "world.h"
 
 typedef struct {
     Vector3 mapPosition;         // Player's world position (camera position)
@@ -19,14 +20,20 @@ void UpdatePlayer(Player *player);
 typedef struct {
     bool hit;
     Vector3 position;
+    int hitBlockX, hitBlockY, hitBlockZ;
     Vector3 normal;
     int blockID;
     float t;
+    int chunkX;
+    int chunkZ;
 } RaycastHit;
 
 RaycastHit RaycastChunk(const Chunk *chunk, Vector3 origin, Vector3 direction, float maxDistance);
 
-RaycastHit GetPlayerRaycastHit(Player *player, Chunk *chunk, float maxDistance);
+RaycastHit GetPlayerRaycastHit(Player *player, World *world, float maxDistance);
+
+// Osolete with multichunk worlds.
+//RaycastHit GetPlayerRaycastHit(Player *player, Chunk *chunk, float maxDistance);
 
 void UpdateFreeCamera(Camera3D *cam, float speed, float *yawOut, float *pitchOut);
 

include/world.h

@@ -0,0 +1,22 @@
+// world.h
+#ifndef WORLD_H
+#define WORLD_H
+
+#include "chunkStructures.h"
+
+#define WORLD_SIZE_X 16
+#define WORLD_SIZE_Z 16
+
+// World is currently a flat grid of chunks on the X-Z plane
+typedef struct {
+    Chunk *chunks[WORLD_SIZE_X][WORLD_SIZE_Z];
+} World;
+
+void InitWorld(World *world);
+void FreeWorld(World *world);
+void UpdateWorld(World *world);
+Chunk *GetChunk(World *world, int chunkX, int chunkZ);
+
+Chunk *GetChunkContainingBlock(World *world, int wx, int wz);
+
+#endif

source/chunkGenerator.c

@@ -5,7 +5,7 @@
 #include "chunkGenerator.h"
 #include "blockTypes.h"
 
-// Fill a chunk with normalish Minecraft style flatworld terrain. A few layers of stone on the bottom, a few layers of dirt, and a layer of grass on top.
+// Fill a chunk with normalish Minecraft style flatworld terrain. Some layers of stone on the bottom, a few layers of dirt, and a layer of grass on top.
 void GenerateFlatChunk(Chunk *chunk) {
     for (int x = 0; x < CHUNK_SIZE_X; x++) {
         for (int z = 0; z < CHUNK_SIZE_Z; z++) {

source/chunkIO.c

@@ -0,0 +1,30 @@
+// chunkIO.c
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include "chunkIO.h"
+
+bool SaveChunk(const Chunk *chunk) {
+    char filename[128];
+    snprintf(filename, sizeof(filename), "saves/chunk-%d-%d.dat", chunk->x, chunk->z);
+
+    FILE *file = fopen(filename, "wb");
+    if (!file) return false;
+
+    fwrite(chunk->blocks, sizeof(Block), CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z, file);
+    fclose(file);
+    return true;
+}
+
+bool LoadChunk(Chunk *chunk) {
+    char filename[128];
+    snprintf(filename, sizeof(filename), "saves/chunk-%d-%d.dat", chunk->x, chunk->z);
+
+    FILE *file = fopen(filename, "rb");
+    if (!file) return false;
+
+    fread(chunk->blocks, sizeof(Block), CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z, file);
+    fclose(file);
+    return true;
+}

source/chunkStructures.c

@@ -10,20 +10,18 @@
 #include <string.h>
 #include <stdio.h>
 
-bool SaveChunk(const Chunk *chunk, const char *filename) {
+void InitChunk(Chunk *chunk, int chunkX, int chunkZ) {
-    FILE *fp = fopen(filename, "wb");
+    chunk->mesh = (Mesh){ 0 };
-    if (!fp) return false;
+    chunk->x = chunkX;
-    size_t written = fwrite(chunk->blocks, sizeof(Block), CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z, fp);
+    chunk->z = chunkZ;
-    fclose(fp);
+    // Zero out block data
-    return written == CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z;
+    for (int x = 0; x < CHUNK_SIZE_X; x++) {
+        for (int y = 0; y < CHUNK_SIZE_Y; y++) {
+            for (int z = 0; z < CHUNK_SIZE_Z; z++) {
+                chunk->blocks[x][y][z] = (Block){ .type = 0 };
+            }
+        }
     }
-
-bool LoadChunk(Chunk *chunk, const char *filename) {
-    FILE *fp = fopen(filename, "rb");
-    if (!fp) return false;
-    size_t read = fread(chunk->blocks, sizeof(Block), CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z, fp);
-    fclose(fp);
-    return read == CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z;
 }
 
 // Places a tree at the position specified by x, y, z

source/playerController.c

@@ -3,8 +3,13 @@
 #include "raymath.h"
 #include "playerController.h"
 #include "blockTypes.h"
+#include "world.h"
 #include <math.h>
 
+inline int FloorDiv(int a, int b) {
+    return (a >= 0) ? (a / b) : ((a - b + 1) / b);
+}
+
 void UpdatePlayer(Player *player) {
     Vector2 mouseDelta = GetMouseDelta();
     player->playerOrientation.x += mouseDelta.x * -0.002f;
@@ -45,68 +50,69 @@ void UpdatePlayer(Player *player) {
     player->camera.target = Vector3Add(player->mapPosition, player->forward);
 }
 
-// An implementation of DDA (digital differential analyzer), steps through each voxel boundary along a ray cast from origin along direction to maxDistance
+RaycastHit GetPlayerRaycastHit(Player *player, World *world, float maxDistance) {
-RaycastHit RaycastChunk(const Chunk *chunk, Vector3 origin, Vector3 direction, float maxDistance) {
+    RaycastHit result = {0};
-    RaycastHit result = {0}; // Initialize result: no hit, zeroed values
+    Vector3 origin = Vector3Add(player->camera.position, Vector3Scale(player->forward, 0.001f));
+    Vector3 dir = Vector3Normalize(player->forward);
 
-    direction = Vector3Normalize(direction); // Ensure direction is a unit vector
-
-    // Nudge the origin slightly to avoid precision issues at block boundaries
-    origin = Vector3Add(origin, Vector3Scale(direction, 0.001f));
-
-    // Determine the next voxel boundary to cross along each axis
-    float nextX = (direction.x >= 0) ? ceilf(origin.x) : floorf(origin.x);
-    float nextY = (direction.y >= 0) ? ceilf(origin.y) : floorf(origin.y);
-    float nextZ = (direction.z >= 0) ? ceilf(origin.z) : floorf(origin.z);
-
-    // Get integer voxel coordinates for current position
     int x = (int)floorf(origin.x);
     int y = (int)floorf(origin.y);
     int z = (int)floorf(origin.z);
 
-    // Determine step direction: +1 or -1 along each axis
+    int stepX = (dir.x > 0) ? 1 : -1;
-    int stepX = (direction.x >= 0) ? 1 : -1;
+    int stepY = (dir.y > 0) ? 1 : -1;
-    int stepY = (direction.y >= 0) ? 1 : -1;
+    int stepZ = (dir.z > 0) ? 1 : -1;
-    int stepZ = (direction.z >= 0) ? 1 : -1;
 
-    // How far to travel along the ray to cross a voxel in each axis
+    float tMaxX = ((stepX > 0 ? (x + 1) : x) - origin.x) / dir.x;
-    float tDeltaX = (direction.x == 0) ? INFINITY : fabsf(1.0f / direction.x);
+    float tMaxY = ((stepY > 0 ? (y + 1) : y) - origin.y) / dir.y;
-    float tDeltaY = (direction.y == 0) ? INFINITY : fabsf(1.0f / direction.y);
+    float tMaxZ = ((stepZ > 0 ? (z + 1) : z) - origin.z) / dir.z;
-    float tDeltaZ = (direction.z == 0) ? INFINITY : fabsf(1.0f / direction.z);
 
-    // Distance from origin to the first voxel boundary (for each axis)
+    float tDeltaX = fabsf(1.0f / dir.x);
-    float tMaxX = (direction.x == 0) ? INFINITY : (nextX - origin.x) / direction.x;
+    float tDeltaY = fabsf(1.0f / dir.y);
-    float tMaxY = (direction.y == 0) ? INFINITY : (nextY - origin.y) / direction.y;
+    float tDeltaZ = fabsf(1.0f / dir.z);
-    float tMaxZ = (direction.z == 0) ? INFINITY : (nextZ - origin.z) / direction.z;
 
-    float t = 0.0f; // Total traveled distance along the ray
+    float t = 0.0f;
-    Vector3 lastNormal = {0}; // Which face was entered (used for highlighting/interactions)
+    Vector3 lastNormal = {0};
 
-    // Walk the ray through the voxel grid until we exceed maxDistance
+    for (int i = 0; i < (int)(maxDistance * 3); i++) {
-    while (t < maxDistance) {
+        int chunkX = FloorDiv(x, CHUNK_SIZE_X);
-        // Check if the current voxel is inside the chunk bounds
+        int chunkZ = FloorDiv(z, CHUNK_SIZE_Z);
-        if (x >= 0 && y >= 0 && z >= 0 &&
+        Chunk *chunk = GetChunk(world, chunkX, chunkZ);
-            x < CHUNK_SIZE_X && y < CHUNK_SIZE_Y && z < CHUNK_SIZE_Z) {
 
-            int blockID = chunk->blocks[x][y][z].type;
+        if (chunk) {
+            int localX = x - chunkX * CHUNK_SIZE_X;
+            int localY = y;
+            int localZ = z - chunkZ * CHUNK_SIZE_Z;
 
-        // If it's not air, we hit something!
+            if (localX >= 0 && localX < CHUNK_SIZE_X &&
-        if (blockID != BLOCK_AIR) {
+                localY >= 0 && localY < CHUNK_SIZE_Y &&
+                localZ >= 0 && localZ < CHUNK_SIZE_Z) {
+
+                Block block = chunk->blocks[localX][localY][localZ];
+            if (block.type != BLOCK_AIR) {
                 result.hit = true;
-            result.blockID = blockID;
+                result.hitBlockX = x;
-            result.position = (Vector3){x, y, z};
+                result.hitBlockY = y;
+                result.hitBlockZ = z;
                 result.normal = lastNormal;
+                result.chunkX = chunkX;
+                result.chunkZ = chunkZ;
                 result.t = t;
+
+                // For visual debugging
+                result.position = Vector3Add((Vector3){x, y, z}, Vector3Scale(lastNormal, 0.5f));
+
                 return result;
             }
                 }
+        }
 
-            // Move to the next voxel along the smallest tMax (i.e., the closest boundary)
+        // DDA step
         if (tMaxX < tMaxY && tMaxX < tMaxZ) {
             x += stepX;
             t = tMaxX;
             tMaxX += tDeltaX;
-                lastNormal = (Vector3){-stepX, 0, 0}; // Normal points opposite the ray step
+            lastNormal = (Vector3){-stepX, 0, 0};
         } else if (tMaxY < tMaxZ) {
             y += stepY;
             t = tMaxY;
@@ -118,35 +124,10 @@ RaycastHit RaycastChunk(const Chunk *chunk, Vector3 origin, Vector3 direction, f
             tMaxZ += tDeltaZ;
             lastNormal = (Vector3){0, 0, -stepZ};
         }
+
+        if (t > maxDistance) break;
     }
 
-    // If no block was hit, return default (no hit)
     return result;
 }
 
-
-RaycastHit GetPlayerRaycastHit(Player *player, Chunk *chunk, float maxDistance) {
-    Ray ray = {
-        .position = player->mapPosition,
-        .direction = Vector3Normalize(player->forward)
-    };
-    return RaycastChunk(chunk, ray.position, ray.direction, maxDistance);
-}
-
-void HandleBlockInteraction(Player *player, Chunk *chunk, RaycastHit hit, int blockSelection) {
-    if (hit.hit && IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) {
-        chunk->blocks[(int)hit.position.x][(int)hit.position.y][(int)hit.position.z].type = BLOCK_AIR;
-    }
-
-    if (hit.hit && IsMouseButtonPressed(MOUSE_RIGHT_BUTTON)) {
-        int px = (int)(hit.position.x + hit.normal.x);
-        int py = (int)(hit.position.y + hit.normal.y);
-        int pz = (int)(hit.position.z + hit.normal.z);
-
-        if (px >= 0 && px < CHUNK_SIZE_X &&
-            py >= 0 && py < CHUNK_SIZE_Y &&
-            pz >= 0 && pz < CHUNK_SIZE_Z) {
-            chunk->blocks[px][py][pz].type = blockSelection;
-            }
-    }
-}

source/voxelThing.c

@@ -9,24 +9,19 @@
 #include "blockTypes.h"
 #include "playerController.h"
 #include "chunkGenerator.h"
+#include "chunkIO.h"
+#include "world.h"
 
 int main(void) {
     // --- Screen setup ---
     SetConfigFlags(FLAG_WINDOW_RESIZABLE);
-    InitWindow(800, 600, "VoxelThing");
+    InitWindow(800, 600, "voxelThing");
     SetExitKey(-1);
     DisableCursor();
 
     // --- World generation ---
-    Chunk chunk;
+    World world;
-    if (!LoadChunk(&chunk, "saves/chunk_0_0_0.dat")) {
+    InitWorld(&world);
-        // There was no save, gotta generate a fresh chunk to play with.
-        printf("--- WORLDGEN--- No save, creating new chunk.\n");
-        GenerateFlatChunk(&chunk);
-        PlaceTreeAt(&chunk, 8, 64, 8);
-        SaveChunk(&chunk, "saves/chunk_0_0_0.dat");
-    }
-    Mesh chunkMesh = GenerateChunkMesh(&chunk);
 
     // --- Load textures and materials ---
     Texture2D atlas = LoadTexture("assets/TextureAtlas.png");
@@ -48,7 +43,7 @@ int main(void) {
 
     bool paused = false;
     RaycastHit hit;
-    int blockSelection = BLOCK_SAND;
+    int blockSelection = BLOCK_STONE;
 
     while (!WindowShouldClose()) {
         int screenWidth = GetScreenWidth();
@@ -78,12 +73,53 @@ int main(void) {
 
         if (!paused) {
             UpdatePlayer(&player);
-            hit = GetPlayerRaycastHit(&player, &chunk, 10.0f);
+            hit = GetPlayerRaycastHit(&player, &world, 10.0f);
-            HandleBlockInteraction(&player, &chunk, hit, blockSelection);
 
-            if (hit.hit && (IsMouseButtonPressed(MOUSE_LEFT_BUTTON) || IsMouseButtonPressed(MOUSE_RIGHT_BUTTON))) {
+
-                UnloadMesh(chunkMesh);
+            if (hit.hit) {
-                chunkMesh = GenerateChunkMesh(&chunk);
+                int bx = hit.hitBlockX;
+                int by = hit.hitBlockY;
+                int bz = hit.hitBlockZ;
+
+                int placeX = bx + (int)hit.normal.x;
+                int placeY = by + (int)hit.normal.y;
+                int placeZ = bz + (int)hit.normal.z;
+
+                // Handle removal
+                if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) {
+                    Chunk *targetChunk = GetChunkContainingBlock(&world, bx, bz);
+                    if (targetChunk) {
+                        int lx = bx - targetChunk->x * CHUNK_SIZE_X;
+                        int lz = bz - targetChunk->z * CHUNK_SIZE_Z;
+
+                        if (lx >= 0 && lx < CHUNK_SIZE_X && lz >= 0 && lz < CHUNK_SIZE_Z &&
+                            by >= 0 && by < CHUNK_SIZE_Y) {
+                            targetChunk->blocks[lx][by][lz].type = BLOCK_AIR;
+                        UnloadMesh(targetChunk->mesh);
+                        targetChunk->mesh = GenerateChunkMesh(targetChunk);
+                        // Mark chunk as changed.
+                        targetChunk->hasChanged = true;
+                            }
+                    }
+                }
+
+                // Handle placement
+                if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON)) {
+                    Chunk *targetChunk = GetChunkContainingBlock(&world, placeX, placeZ);
+                    if (targetChunk) {
+                        int lx = placeX - targetChunk->x * CHUNK_SIZE_X;
+                        int lz = placeZ - targetChunk->z * CHUNK_SIZE_Z;
+
+                        if (lx >= 0 && lx < CHUNK_SIZE_X && lz >= 0 && lz < CHUNK_SIZE_Z &&
+                            placeY >= 0 && placeY < CHUNK_SIZE_Y) {
+                            targetChunk->blocks[lx][placeY][lz].type = blockSelection;
+                        UnloadMesh(targetChunk->mesh);
+                        targetChunk->mesh = GenerateChunkMesh(targetChunk);
+                        // Mark chunk as changed.
+                        targetChunk->hasChanged = true;
+
+                            }
+                    }
                 }
             }
 
@@ -91,11 +127,21 @@ int main(void) {
             ClearBackground(RAYWHITE);
 
             BeginMode3D(player.camera);
-        DrawMesh(chunkMesh, mat, MatrixIdentity());
+            //DrawMesh(chunkMesh, mat, MatrixIdentity());
+            for (int x = 0; x < WORLD_SIZE_X; x++) {
+                for (int z = 0; z < WORLD_SIZE_Z; z++) {
+                    Chunk *chunk = world.chunks[x][z];
+                    if (chunk && chunk->mesh.vertexCount > 0) {
+                        DrawMesh(chunk->mesh, mat, MatrixTranslate(x * CHUNK_SIZE_X, 0, z * CHUNK_SIZE_Z));
+                    }
+                }
+            }
 
             if (hit.hit) {
-            DrawCubeWires(Vector3Add(hit.position, (Vector3){0.5f, 0.5f, 0.5f}), 1.02f, 1.02f, 1.02f, BLACK);
+                Vector3 mid = Vector3Add((Vector3){hit.hitBlockX, hit.hitBlockY, hit.hitBlockZ},
-            //DrawFaceHighlight(hit.position, hit.normal);
+                                         (Vector3){0.5f, 0.5f, 0.5f});
+                DrawCubeWires(mid, 1.02f, 1.02f, 1.02f, BLACK);
+                //DrawLine3D(mid, Vector3Add(mid, hit.normal), RED);  // Normal direction
             }
 
             EndMode3D();
@@ -107,6 +153,8 @@ int main(void) {
             // Debug info
             DrawText(TextFormat("Yaw: %.1f  Pitch: %.1f", player.playerOrientation.x * RAD2DEG, player.playerOrientation.y * RAD2DEG), 10, 10, 20, DARKGRAY);
 
+        }
+
         if (paused) {
             DrawRectangle(0, 0, screenWidth, screenHeight, Fade(DARKGRAY, 0.5f));
             DrawText("Paused", screenWidth / 2 - MeasureText("Paused", 40) / 2, screenHeight / 2 - 20, 40, RAYWHITE);
@@ -117,9 +165,8 @@ int main(void) {
     }
 
     // --- Cleanup ---
-    SaveChunk(&chunk, "saves/chunk_0_0_0.dat");
     UnloadTexture(atlas);
-    UnloadMesh(chunkMesh);
+    FreeWorld(&world);
     UnloadMaterial(mat);
     CloseWindow();
     return 0;

source/world.c

@@ -0,0 +1,60 @@
+// world.c
+#include <stdlib.h>
+#include "world.h"
+#include "chunkGenerator.h"
+#include "chunkRenderer.h"
+#include "chunkStructures.h"
+#include "chunkIO.h"
+#include <stdio.h>
+
+void InitWorld(World *world) {
+    for (int x = 0; x < WORLD_SIZE_X; x++) {
+        for (int z = 0; z < WORLD_SIZE_Z; z++) {
+            world->chunks[x][z] = malloc(sizeof(Chunk));
+            Chunk *chunk = world->chunks[x][z];
+            InitChunk(chunk, x, z);
+
+            if (!LoadChunk(chunk)) {
+                // Later
+                //GenerateChunkTerrain(chunk);
+                GenerateFlatChunk(chunk);
+                SaveChunk(chunk);
+            }
+
+            chunk->mesh = GenerateChunkMesh(chunk);
+        }
+    }
+}
+
+void FreeWorld(World *world) {
+    for (int x = 0; x < WORLD_SIZE_X; x++) {
+        for (int z = 0; z < WORLD_SIZE_Z; z++) {
+            Chunk *chunk = world->chunks[x][z];
+            if(chunk->hasChanged) SaveChunk(chunk);
+            if (chunk) {
+                UnloadMesh(chunk->mesh);
+                free(chunk);
+            }
+        }
+    }
+}
+
+Chunk *GetChunkContainingBlock(World *world, int wx, int wz) {
+    int chunkX = wx / CHUNK_SIZE_X;
+    int chunkZ = wz / CHUNK_SIZE_Z;
+    if (wx < 0) chunkX--;
+    if (wz < 0) chunkZ--;
+    return GetChunk(world, chunkX, chunkZ);
+}
+
+
+void UpdateWorld(World *world) {
+    // For now, stub function. Will handle streaming later.
+}
+
+Chunk *GetChunk(World *world, int chunkX, int chunkZ) {
+    if (chunkX >= 0 && chunkX < WORLD_SIZE_X && chunkZ >= 0 && chunkZ < WORLD_SIZE_Z) {
+        return world->chunks[chunkX][chunkZ];
+    }
+    return NULL;
+}