feat: map generation using perlin noise

1 files changed, 43 insertions, 3 deletions

diff --git a/main.c b/main.c
index 412e969..1f265e7 100644
--- a/main.c
+++ b/main.c
@@ -17,8 +17,13 @@
  */
 
 #include "raylib.h"
+#include <math.h>
 #include <stddef.h>
 
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#define CLAMP(val, min, max) MIN(max, MAX(min, val))
+
 int main(void) {
   const int screenWidth = 800;
   const int screenHeight = 450;
@@ -363,8 +368,22 @@ int main(void) {
     LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_thin_fall.obj"),
     LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_thin.obj"),
   };
-
+  
+#define MAP_SIZE 64
   Vector3 position = {0};
+  Image map = GenImagePerlinNoise(MAP_SIZE, MAP_SIZE, 0, 0, 1.f);
+  Texture2D map_texture = LoadTextureFromImage(map);
+
+  for (size_t i = 0; i < MAP_SIZE * MAP_SIZE; i++) {
+    Color c = GetImageColor(map, i % MAP_SIZE, i / MAP_SIZE);
+    ImageDrawPixel(&map, i % MAP_SIZE, i / MAP_SIZE, (Color) {
+      .r = MAX(0, c.r - 64) / 32,
+      .g = MAX(0, c.r - 64) / 32,
+      .b = MAX(0, c.r - 64) / 32,
+      .a = 255
+        });
+  }
+  Color *map_data = LoadImageColors(map);
 
   // SetTargetFPS(60);
   while (!WindowShouldClose()) {
@@ -373,12 +392,33 @@ int main(void) {
     BeginDrawing();
     ClearBackground(RAYWHITE);
     BeginMode3D(camera);
-    for (size_t i = 0; i < sizeof(models) / sizeof(models[0]); ++i) {
-      DrawModel(models[i], (Vector3){2.f * (i / 19) - 19.f , 0.f, 2.f * (i % 19) - 19.f }, 1.0f, WHITE);
+    for (int i = 0; i < MAP_SIZE * MAP_SIZE; i++) {
+      int x = i % MAP_SIZE, y = i / MAP_SIZE;
+      DrawModel(models[128], 
+          (Vector3){
+          .x = MAP_SIZE * (x / (float) MAP_SIZE - 0.5f), 
+          .y = map_data[i].r - 8, //- (map_gradient_magnitude_data[i].g < 2),
+          .z = MAP_SIZE * (y / (float) MAP_SIZE - 0.5f)
+          } , 1.f, WHITE);
+      int gradients[4][2] = {{0,-1},{-1,0},{0,1},{1,0}};
+      for (int gradient_i = 0; gradient_i < 4; gradient_i++) {
+        int dx = CLAMP(x + gradients[gradient_i][0], 0, MAP_SIZE - 1);
+        int dy = CLAMP(y + gradients[gradient_i][1], 0, MAP_SIZE - 1);
+        for (int height = map_data[i].r; height < map_data[dy * MAP_SIZE + dx].r; height++) {
+          DrawModelEx(models[76],
+              (Vector3){
+              .x = MAP_SIZE * (x / (float) MAP_SIZE - 0.5f), 
+              .y = height - 8,
+              .z = MAP_SIZE * (y / (float) MAP_SIZE - 0.5f)
+              },
+              (Vector3) {0, 1, 0}, gradient_i * 90.f, (Vector3) {1,1,1}, WHITE);
+        }
+      }
     }
     DrawGrid(20, 10.0f);
     EndMode3D();
     DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
+    DrawTexture(map_texture, 0, 0, WHITE);
     EndDrawing();
   }