first commit

assets/shaders/terrain.vert

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+#version 450 core
+out gl_PerVertex { vec4 gl_Position; };
+
+layout(std140, binding=0) uniform PerFrame { mat4 uView; mat4 uProj; vec4 uLightDir; };
+layout(std140, binding=1) uniform PerObject { mat4 uModel; };
+
+layout(location=0) in vec3 aPos;  // XY from grid, Z ignored
+layout(location=2) in vec2 aUV;   // 0..1 across the grid
+
+layout(location=0) out VS_OUT {
+  vec3 wPos;
+  vec2 uv;
+} v;
+
+// ---- tiny fBm noise (tile-free, cheap) ----
+float hash(vec2 p){ return fract(sin(dot(p, vec2(127.1,311.7))) * 43758.5453); }
+float noise(vec2 p){
+  vec2 i=floor(p), f=fract(p);
+  float a = hash(i + vec2(0,0));
+  float b = hash(i + vec2(1,0));
+  float c = hash(i + vec2(0,1));
+  float d = hash(i + vec2(1,1));
+  vec2 u = f*f*(3.0-2.0*f);
+  return mix(mix(a,b,u.x), mix(c,d,u.x), u.y);
+}
+float fbm(vec2 p){
+  float a=0.5, s=0.0;
+  for(int i=0;i<5;i++){ s += a*noise(p); p = p*2.02 + 17.0; a*=0.5; }
+  return s;
+}
+
+// tunables
+uniform float uHeightScale = 3.0;     // world Z amplitude
+uniform float uFreq        = 2.0;     // base frequency (cycles over 0..1 uv)
+
+void main(){
+  float h = fbm(aUV * uFreq) * uHeightScale;  // Z-up displacement
+  vec3 p  = vec3(aPos.xy, h);
+  vec4 w  = uModel * vec4(p,1.0);
+
+  v.wPos = w.xyz;
+  v.uv   = aUV;
+
+  gl_Position = uProj * uView * w;
+}