#include "/Lib/Settings.glsl"
#include "/Lib/Utilities.glsl"
// MinecraftPT — Waving Plants
// Wind animation for grass, plants, leaves.

#ifndef WAVING_PLANTS_GLSL
#define WAVING_PLANTS_GLSL

void WavingPlants(inout vec4 worldPos, float lightLevel){
	float time = frameTimeCounter * 0.05 * WAVING_SPEED;

	// Wind direction
	vec2 wind = vec2(0.5, 0.3) * sin(time) + vec2(0.2);

	// Amplitude by plant type
	float amplitude = GRASS_AMPLITUDE;
	#ifdef IS_LEAVES
		amplitude = LEAVES_AMPLITUDE;
	#endif

	float dist = length(worldPos.xyz - gbufferModelViewInverse[3].xyz);
	float fade = 1.0 - saturate(dist / WAVING_RANGE);

	vec3 vertexPos = worldPos.xyz;

	// Vertex-based wave
	vec3 offset = vec3(wind * sin(vertexPos.x * 0.3 + vertexPos.z * 0.2 + time * 2.0), 0.0);
	offset *= vertexPos.y * amplitude * fade;

	// Random per-vertex jitter (height-based)
	float heightFactor = vertexPos.y;
	float noise = sin(vertexPos.x * 12.9898 + vertexPos.z * 78.233 + time) * 0.5 + 0.5;
	offset.x += noise * amplitude * 0.5 * heightFactor * fade;
	offset.z += noise * amplitude * 0.3 * heightFactor * fade;

	worldPos.xyz += offset;
}

#endif