nuclear@1: #include "level.h"
nuclear@1: 
nuclear@1: #include "opt.h"
nuclear@1: 
nuclear@1: Level::Level()
nuclear@1: {
nuclear@1: 	terrain = 0;
nuclear@4: 	world_size = Vector3(1, 1, 1);
nuclear@1: }
nuclear@1: 
nuclear@1: Level::~Level()
nuclear@1: {
nuclear@1: 	delete terrain;
nuclear@1: }
nuclear@1: 
nuclear@3: static float terrain_func(float x, float y, float z)
nuclear@3: {
nuclear@3: 	float nx = (x * 2.0 - 1.0) * 0.9;
nuclear@3: 	float ny = (y * 2.0 - 1.0) * 0.9;
nuclear@3: 	float valley = nx * nx + ny * ny;
nuclear@3: 
nuclear@3: 	float s = opt.gen_noise_scale;
nuclear@4: 	float noise = 0.2 * fbm2(x * s, y * s, 4) * (valley + 0.25);
nuclear@3: 	float grad = 0.75 - z + noise + valley * 0.4;
nuclear@3: 
nuclear@3: 	return grad;
nuclear@3: }
nuclear@3: 
nuclear@1: void Level::generate()
nuclear@1: {
nuclear@1: 	delete terrain;
nuclear@1: 
nuclear@1: 	int xsz = opt.world_size[0];
nuclear@1: 	int ysz = opt.world_size[1];
nuclear@1: 	int zsz = opt.world_size[2];
nuclear@1: 
nuclear@1: 	terrain = new Volume(xsz, ysz, zsz);
nuclear@1: 
nuclear@1: 	for(int i=0; i<xsz; i++) {
nuclear@1: 		for(int j=0; j<ysz; j++) {
nuclear@3: 			float x = (float)i / (float)xsz;
nuclear@3: 			float y = (float)j / (float)ysz;
nuclear@3: 			//float peak = 0.4 * noise2(x, y) * 0.5 + 0.5;
nuclear@1: 
nuclear@1: 			for(int k=0; k<zsz; k++) {
nuclear@1: 				Vector4 voxel(1, 1, 1, 1);
nuclear@1: 				float z = (float)k / (float)zsz;
nuclear@1: 
nuclear@3: 				float alpha = terrain_func(x, y, z);
nuclear@3: 
nuclear@1: 				if(z < 0.1) {
nuclear@1: 					// lava
nuclear@1: 					static const Vector4 col1(0.96, 0.3, 0.1, 1);
nuclear@1: 					static const Vector4 col2(0.96, 0.75, 0.1, 1);
nuclear@3: 					float t = noise3(x, y, z) * 0.5 + 0.5;
nuclear@1: 					voxel = lerp(col1, col2, t);
nuclear@3: 				} else if(z < 0.8) {
nuclear@3: 					if(alpha < 0.56) {
nuclear@3: 						// grass
nuclear@4: 						voxel = Vector4(0.49, 0.72, 0.48);
nuclear@3: 					} else {
nuclear@3: 						// mud
nuclear@3: 						voxel = Vector4(0.57, 0.43, 0.29, 1);
nuclear@3: 					}
nuclear@1: 				}	// else snow (default)
nuclear@1: 
nuclear@3: 				voxel.w = alpha;
nuclear@1: 				terrain->set_voxel(i, j, k, voxel);
nuclear@1: 			}
nuclear@1: 		}
nuclear@1: 	}
nuclear@4: 
nuclear@4: 	// generate some blobs
nuclear@4: 	for(int i=0; i<opt.gen_num_blobs; i++) {
nuclear@4: 		Blob b;
nuclear@5: 		b.pos = Vector3(frand(1.0) - 0.5, 2.0, frand(1.0) - 0.5) * 2.0;
nuclear@5: 		printf("blob[%d]: %f %f %f\n", i, b.pos.x, b.pos.y, b.pos.z);
nuclear@4: 		b.velocity = Vector3(0, 0, 0);
nuclear@4: 		blobs.push_back(b);
nuclear@4: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: bool Level::load(const char *fname)
nuclear@1: {
nuclear@1: 	return false;
nuclear@1: }
nuclear@1: 
nuclear@1: bool Level::save(const char *fname) const
nuclear@1: {
nuclear@1: 	return false;
nuclear@1: }
nuclear@4: 
nuclear@4: #define CLAMP(x, a, b)	((x) < (a) ? (a) : ((x) > (b) ? (b) : (x)))
nuclear@4: 
nuclear@4: const Vector4 &Level::get_voxel(const Vector3 &pos) const
nuclear@4: {
nuclear@4: 	Vector3 p = pos / world_size + Vector3(0.5, 0.5, 0.5);
nuclear@4: 
nuclear@4: 	int xsz = terrain->get_size(0);
nuclear@4: 	int ysz = terrain->get_size(1);
nuclear@4: 	int zsz = terrain->get_size(2);
nuclear@4: 
nuclear@4: 	int i = (int)(p.x * xsz);
nuclear@4: 	int j = (int)(p.y * ysz);
nuclear@4: 	int k = (int)(p.z * zsz);
nuclear@4: 
nuclear@4: 	return terrain->get_voxel(CLAMP(i, 0, xsz - 1), CLAMP(j, 0, ysz - 1), CLAMP(k, 0, zsz - 1));
nuclear@4: }
nuclear@4: 
nuclear@4: Vector3 Level::calc_normal(const Vector3 &pos) const
nuclear@4: {
nuclear@4: 	int xsz = terrain->get_size(0);
nuclear@4: 	int ysz = terrain->get_size(1);
nuclear@4: 	int zsz = terrain->get_size(2);
nuclear@4: 
nuclear@4: 	float dx = world_size.x / (float)xsz;
nuclear@4: 	float dy = world_size.y / (float)ysz;
nuclear@4: 	float dz = world_size.z / (float)zsz;
nuclear@4: 
nuclear@4: 	float dfdx = get_voxel(pos + Vector3(dx, 0, 0)).w - get_voxel(pos - Vector3(dx, 0, 0)).w;
nuclear@4: 	float dfdy = get_voxel(pos + Vector3(0, dy, 0)).w - get_voxel(pos - Vector3(0, dy, 0)).w;
nuclear@4: 	float dfdz = get_voxel(pos + Vector3(0, 0, dz)).w - get_voxel(pos - Vector3(0, 0, dz)).w;
nuclear@4: 
nuclear@4: 	return Vector3(dfdx, dfdy, dfdz);
nuclear@4: }
nuclear@4: 
nuclear@4: bool Level::collision(const Vector3 &pos0, const Vector3 &pos1, Vector3 *outpos, Vector3 *outnorm) const
nuclear@4: {
nuclear@4: 	Vector4 vox0 = get_voxel(pos0);
nuclear@4: 	Vector4 vox1 = get_voxel(pos1);
nuclear@4: 
nuclear@4: 	if(vox0.w < 0.5 && vox1.w >= 0.5) {
nuclear@4: 		*outpos = lerp(pos0, pos1, 0.5);	// TODO
nuclear@4: 		*outnorm = calc_normal(*outpos);
nuclear@4: 		return true;
nuclear@4: 	}
nuclear@4: 	return false;
nuclear@4: }