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Kelsidavis-WoWee/tools/editor/terrain_editor.cpp
Kelsi a91233a6ec feat(editor): erosion brush, NPC load, auto-save 
- Erode brush mode: simulates water erosion by moving height downhill
  based on slope, creating natural drainage patterns and gullies
- NPC JSON loader: File > Load NPCs parses saved creatures.json back
  into the spawn list (round-trip save/load now works)
- Auto-save: every 5 minutes when unsaved changes exist, exports the
  full zone (ADT + WDT + creatures) to the output directory
- Sculpt mode now has 6 brush types: Raise/Lower/Smooth/Flatten/Level/Erode
2026-05-05 04:44:54 -07:00

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#include "terrain_editor.hpp"
#include "core/logger.hpp"
#include <algorithm>
#include <cmath>
#include <numeric>
#include <random>
namespace wowee {
namespace editor {
TerrainEditor::TerrainEditor() = default;
pipeline::ADTTerrain TerrainEditor::createBlankTerrain(int tileX, int tileY, float baseHeight,
Biome biome) {
pipeline::ADTTerrain terrain;
terrain.loaded = true;
terrain.version = 18;
terrain.coord = {tileX, tileY};
const auto& biomeTextures = getBiomeTextures(biome);
// Integer grid noise — guarantees shared edge vertices get identical heights
auto gridNoise = [](int gx, int gy) -> float {
uint32_t h = static_cast<uint32_t>(gx * 374761393 + gy * 668265263);
h = (h ^ (h >> 13)) * 1274126177;
h = h ^ (h >> 16);
return (static_cast<float>(h & 0xFFFF) / 65535.0f - 0.5f) * 3.0f;
};
for (int cy = 0; cy < 16; cy++) {
for (int cx = 0; cx < 16; cx++) {
auto& chunk = terrain.chunks[cy * 16 + cx];
chunk.flags = 0;
chunk.indexX = cx;
chunk.indexY = cy;
chunk.holes = 0;
chunk.position[0] = (32.0f - tileX) * TILE_SIZE - cx * CHUNK_SIZE;
chunk.position[1] = (32.0f - tileY) * TILE_SIZE - cy * CHUNK_SIZE;
chunk.position[2] = baseHeight;
chunk.heightMap.loaded = true;
for (int i = 0; i < 145; i++) {
int row = i / 17;
int col = i % 17;
if (col <= 8) {
// Outer vertex — shared at chunk edges
int globalRow = cy * 8 + row;
int globalCol = cx * 8 + col;
chunk.heightMap.heights[i] = gridNoise(globalRow, globalCol);
} else {
// Inner vertex (quad center) — not shared, offset grid
int innerCol = col - 9;
int globalRow = cy * 16 + row * 2 + 1;
int globalCol = cx * 16 + innerCol * 2 + 1;
chunk.heightMap.heights[i] = gridNoise(globalRow, globalCol);
}
}
// Normals pointing up (will be recalculated by renderer)
for (int i = 0; i < 145; i++) {
chunk.normals[i * 3 + 0] = 0;
chunk.normals[i * 3 + 1] = 0;
chunk.normals[i * 3 + 2] = 127;
}
// Base texture layer
pipeline::TextureLayer layer{};
layer.textureId = 0;
layer.flags = 0;
layer.offsetMCAL = 0;
layer.effectId = 0;
chunk.layers.push_back(layer);
}
}
// Biome textures
terrain.textures.push_back(biomeTextures.base);
terrain.textures.push_back(biomeTextures.secondary);
terrain.textures.push_back(biomeTextures.accent);
terrain.textures.push_back(biomeTextures.detail);
return terrain;
}
glm::vec3 TerrainEditor::chunkVertexWorldPos(int chunkIdx, int vertIdx) const {
const auto& chunk = terrain_->chunks[chunkIdx];
int tileX = terrain_->coord.x;
int tileY = terrain_->coord.y;
int cx = chunkIdx % 16;
int cy = chunkIdx / 16;
float tileNW_renderX = (32.0f - static_cast<float>(tileY)) * TILE_SIZE;
float tileNW_renderY = (32.0f - static_cast<float>(tileX)) * TILE_SIZE;
float chunkBaseX = tileNW_renderX - static_cast<float>(cy) * CHUNK_SIZE;
float chunkBaseY = tileNW_renderY - static_cast<float>(cx) * CHUNK_SIZE;
float chunkBaseZ = chunk.position[2];
int row = vertIdx / 17;
int col = vertIdx % 17;
float offsetX = static_cast<float>(col);
float offsetY = static_cast<float>(row);
if (col > 8) {
offsetY += 0.5f;
offsetX -= 8.5f;
}
float unitSize = CHUNK_SIZE / 8.0f;
float x = chunkBaseX - offsetY * unitSize;
float y = chunkBaseY - offsetX * unitSize;
float z = chunkBaseZ + chunk.heightMap.heights[vertIdx];
return glm::vec3(x, y, z);
}
float TerrainEditor::getVertexHeight(int chunkIdx, int vertIdx) const {
return terrain_->chunks[chunkIdx].heightMap.heights[vertIdx];
}
void TerrainEditor::setVertexHeight(int chunkIdx, int vertIdx, float height) {
terrain_->chunks[chunkIdx].heightMap.heights[vertIdx] = height;
}
bool TerrainEditor::raycastTerrain(const rendering::Ray& ray, glm::vec3& hitPos) const {
if (!terrain_) return false;
float bestT = 1e30f;
bool hit = false;
for (int chunkIdx = 0; chunkIdx < 256; chunkIdx++) {
const auto& chunk = terrain_->chunks[chunkIdx];
if (!chunk.hasHeightMap()) continue;
// Quick AABB check using actual vertex extent
glm::vec3 corner0 = chunkVertexWorldPos(chunkIdx, 0);
glm::vec3 corner1 = chunkVertexWorldPos(chunkIdx, 144);
glm::vec3 minB = glm::min(corner0, corner1);
glm::vec3 maxB = glm::max(corner0, corner1);
// Expand Z by actual height range in chunk
float minH = chunk.heightMap.heights[0], maxH = minH;
for (int h = 1; h < 145; h++) {
minH = std::min(minH, chunk.heightMap.heights[h]);
maxH = std::max(maxH, chunk.heightMap.heights[h]);
}
minB.z = chunk.position[2] + minH - 10.0f;
maxB.z = chunk.position[2] + maxH + 10.0f;
// Simple AABB-ray test
float tmin = -1e30f, tmax = 1e30f;
for (int i = 0; i < 3; i++) {
if (std::abs(ray.direction[i]) < 1e-8f) {
if (ray.origin[i] < minB[i] || ray.origin[i] > maxB[i]) { tmin = 1e30f; break; }
} else {
float t1 = (minB[i] - ray.origin[i]) / ray.direction[i];
float t2 = (maxB[i] - ray.origin[i]) / ray.direction[i];
if (t1 > t2) std::swap(t1, t2);
tmin = std::max(tmin, t1);
tmax = std::min(tmax, t2);
}
}
if (tmin > tmax || tmax < 0) continue;
// Triangle intersection for each quad
for (int qy = 0; qy < 8; qy++) {
for (int qx = 0; qx < 8; qx++) {
int center = 9 + qy * 17 + qx;
int tl = center - 9;
int tr = center - 8;
int bl = center + 8;
int br = center + 9;
int tris[4][3] = {{center, tl, tr}, {center, tr, br}, {center, br, bl}, {center, bl, tl}};
for (auto& tri : tris) {
glm::vec3 v0 = chunkVertexWorldPos(chunkIdx, tri[0]);
glm::vec3 v1 = chunkVertexWorldPos(chunkIdx, tri[1]);
glm::vec3 v2 = chunkVertexWorldPos(chunkIdx, tri[2]);
// Moller-Trumbore intersection
glm::vec3 e1 = v1 - v0;
glm::vec3 e2 = v2 - v0;
glm::vec3 h = glm::cross(ray.direction, e2);
float a = glm::dot(e1, h);
if (std::abs(a) < 1e-8f) continue;
float f = 1.0f / a;
glm::vec3 s = ray.origin - v0;
float u = f * glm::dot(s, h);
if (u < 0.0f || u > 1.0f) continue;
glm::vec3 q = glm::cross(s, e1);
float v = f * glm::dot(ray.direction, q);
if (v < 0.0f || u + v > 1.0f) continue;
float t = f * glm::dot(e2, q);
if (t > 0.001f && t < bestT) {
bestT = t;
hitPos = ray.origin + ray.direction * t;
hit = true;
}
}
}
}
}
return hit;
}
std::vector<int> TerrainEditor::getAffectedChunks(const glm::vec3& center, float radius) const {
std::vector<int> result;
for (int i = 0; i < 256; i++) {
if (!terrain_->chunks[i].hasHeightMap()) continue;
// Check if any vertex in chunk is within radius
glm::vec3 c0 = chunkVertexWorldPos(i, 0);
glm::vec3 c1 = chunkVertexWorldPos(i, 144);
glm::vec3 chunkCenter = (c0 + c1) * 0.5f;
float chunkRadius = glm::length(c1 - c0) * 0.5f;
if (glm::length(glm::vec2(chunkCenter.x - center.x, chunkCenter.y - center.y)) < radius + chunkRadius)
result.push_back(i);
}
return result;
}
void TerrainEditor::beginStroke() {
if (!terrain_ || strokeActive_) return;
strokeActive_ = true;
auto affected = getAffectedChunks(brush_.getPosition(), brush_.settings().radius);
// Capture all chunks that could be affected during the entire stroke
std::vector<int> allChunks(256);
std::iota(allChunks.begin(), allChunks.end(), 0);
std::vector<int> valid;
for (int i : allChunks) {
if (terrain_->chunks[i].hasHeightMap()) valid.push_back(i);
}
history_.beginEdit(*terrain_, valid);
}
void TerrainEditor::endStroke() {
if (!strokeActive_) return;
strokeActive_ = false;
history_.endEdit(*terrain_);
}
void TerrainEditor::applyBrush(float deltaTime) {
if (!terrain_ || !brush_.isActive()) return;
switch (brush_.settings().mode) {
case BrushMode::Raise: applyRaise(deltaTime); break;
case BrushMode::Lower: applyRaise(deltaTime); break;
case BrushMode::Smooth: applySmooth(deltaTime); break;
case BrushMode::Flatten:
case BrushMode::Level: applyFlatten(deltaTime); break;
case BrushMode::Erode: applyErode(deltaTime); break;
}
}
void TerrainEditor::applyRaise(float dt) {
float amount = brush_.settings().strength * dt;
if (brush_.settings().mode == BrushMode::Lower) amount = -amount;
auto affected = getAffectedChunks(brush_.getPosition(), brush_.settings().radius);
for (int chunkIdx : affected) {
bool modified = false;
for (int v = 0; v < 145; v++) {
glm::vec3 pos = chunkVertexWorldPos(chunkIdx, v);
float dist = glm::length(glm::vec2(pos.x - brush_.getPosition().x,
pos.y - brush_.getPosition().y));
float influence = brush_.getInfluence(dist);
if (influence > 0.0f) {
float h = getVertexHeight(chunkIdx, v);
setVertexHeight(chunkIdx, v, h + amount * influence);
modified = true;
}
}
if (modified) {
stitchEdges(chunkIdx);
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), chunkIdx) == dirtyChunks_.end())
dirtyChunks_.push_back(chunkIdx);
dirty_ = true;
}
}
}
void TerrainEditor::applySmooth(float dt) {
float factor = std::min(1.0f, brush_.settings().strength * dt * 0.5f);
auto affected = getAffectedChunks(brush_.getPosition(), brush_.settings().radius);
// Build a snapshot of all heights so we read from consistent state
std::array<std::array<float, 145>, 256> snapshot;
for (int ci : affected)
for (int v = 0; v < 145; v++)
snapshot[ci][v] = getVertexHeight(ci, v);
// Helper: get height of vertex at global outer grid position,
// looking across chunk boundaries
auto getGlobalOuterHeight = [&](int chunkIdx, int row, int col) -> float {
int cx = chunkIdx % 16;
int cy = chunkIdx / 16;
// If within chunk bounds, return directly
if (row >= 0 && row <= 8 && col >= 0 && col <= 8) {
int vi = row * 17 + col;
return snapshot[chunkIdx][vi];
}
// Cross into adjacent chunk
int ncx = cx, ncy = cy;
int nr = row, nc = col;
if (row < 0) { ncy = cy - 1; nr = 8; }
if (row > 8) { ncy = cy + 1; nr = 0; }
if (col < 0) { ncx = cx - 1; nc = 8; }
if (col > 8) { ncx = cx + 1; nc = 0; }
if (ncx < 0 || ncx > 15 || ncy < 0 || ncy > 15)
return snapshot[chunkIdx][std::clamp(row, 0, 8) * 17 + std::clamp(col, 0, 8)];
int nci = ncy * 16 + ncx;
if (!terrain_->chunks[nci].hasHeightMap())
return snapshot[chunkIdx][std::clamp(row, 0, 8) * 17 + std::clamp(col, 0, 8)];
int vi = nr * 17 + nc;
return snapshot[nci][vi];
};
for (int chunkIdx : affected) {
bool modified = false;
for (int v = 0; v < 145; v++) {
glm::vec3 pos = chunkVertexWorldPos(chunkIdx, v);
float dist = glm::length(glm::vec2(pos.x - brush_.getPosition().x,
pos.y - brush_.getPosition().y));
float influence = brush_.getInfluence(dist);
if (influence <= 0.0f) continue;
int row = v / 17;
int col = v % 17;
float sum = 0.0f;
int count = 0;
if (col <= 8) {
// Outer vertex — sample 4 neighbors, crossing chunk borders
int dirs[][2] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};
for (auto& d : dirs) {
sum += getGlobalOuterHeight(chunkIdx, row + d[0], col + d[1]);
count++;
}
} else {
// Inner vertex — use same-chunk neighbors only
int neighbors[] = {v - 17, v + 17, v - 1, v + 1};
for (int n : neighbors) {
if (n >= 0 && n < 145) {
sum += snapshot[chunkIdx][n];
count++;
}
}
}
if (count > 0) {
float avg = sum / static_cast<float>(count);
float h = snapshot[chunkIdx][v];
float newH = h + (avg - h) * factor * influence;
if (newH != h) {
setVertexHeight(chunkIdx, v, newH);
modified = true;
}
}
}
if (modified) {
stitchEdges(chunkIdx);
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), chunkIdx) == dirtyChunks_.end())
dirtyChunks_.push_back(chunkIdx);
dirty_ = true;
}
}
}
void TerrainEditor::stitchEdges(int chunkIdx) {
int cx = chunkIdx % 16;
int cy = chunkIdx / 16;
auto pushDirty = [&](int idx) {
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), idx) == dirtyChunks_.end())
dirtyChunks_.push_back(idx);
};
if (cx < 15) {
int n = cy * 16 + cx + 1;
if (terrain_->chunks[n].hasHeightMap()) {
for (int r = 0; r <= 8; r++)
setVertexHeight(n, r * 17, getVertexHeight(chunkIdx, r * 17 + 8));
pushDirty(n);
}
}
if (cx > 0) {
int n = cy * 16 + cx - 1;
if (terrain_->chunks[n].hasHeightMap()) {
for (int r = 0; r <= 8; r++)
setVertexHeight(n, r * 17 + 8, getVertexHeight(chunkIdx, r * 17));
pushDirty(n);
}
}
if (cy < 15) {
int n = (cy + 1) * 16 + cx;
if (terrain_->chunks[n].hasHeightMap()) {
for (int c = 0; c <= 8; c++)
setVertexHeight(n, c, getVertexHeight(chunkIdx, 8 * 17 + c));
pushDirty(n);
}
}
if (cy > 0) {
int n = (cy - 1) * 16 + cx;
if (terrain_->chunks[n].hasHeightMap()) {
for (int c = 0; c <= 8; c++)
setVertexHeight(n, 8 * 17 + c, getVertexHeight(chunkIdx, c));
pushDirty(n);
}
}
}
void TerrainEditor::applyFlatten(float dt) {
float factor = std::min(1.0f, brush_.settings().strength * dt * 0.3f);
float targetH = brush_.settings().flattenHeight;
auto affected = getAffectedChunks(brush_.getPosition(), brush_.settings().radius);
for (int chunkIdx : affected) {
bool modified = false;
for (int v = 0; v < 145; v++) {
glm::vec3 pos = chunkVertexWorldPos(chunkIdx, v);
float dist = glm::length(glm::vec2(pos.x - brush_.getPosition().x,
pos.y - brush_.getPosition().y));
float influence = brush_.getInfluence(dist);
if (influence <= 0.0f) continue;
float h = getVertexHeight(chunkIdx, v);
// targetH is absolute world Z; heights are relative to chunk base
float relTarget = targetH - terrain_->chunks[chunkIdx].position[2];
float newH = h + (relTarget - h) * factor * influence;
if (newH != h) {
setVertexHeight(chunkIdx, v, newH);
modified = true;
}
}
if (modified) {
stitchEdges(chunkIdx);
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), chunkIdx) == dirtyChunks_.end())
dirtyChunks_.push_back(chunkIdx);
dirty_ = true;
}
}
}
std::vector<int> TerrainEditor::consumeDirtyChunks() {
std::vector<int> result;
result.swap(dirtyChunks_);
return result;
}
pipeline::TerrainMesh TerrainEditor::regenerateMesh() const {
if (!terrain_) return {};
return pipeline::TerrainMeshGenerator::generate(*terrain_);
}
pipeline::ChunkMesh TerrainEditor::regenerateChunkMesh(int chunkIndex) const {
if (!terrain_) return {};
auto mesh = pipeline::TerrainMeshGenerator::generate(*terrain_);
return mesh.chunks[chunkIndex];
}
void TerrainEditor::undo() {
if (!terrain_) return;
history_.undo(*terrain_);
for (int idx : history_.lastAffectedChunks()) {
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), idx) == dirtyChunks_.end())
dirtyChunks_.push_back(idx);
}
}
void TerrainEditor::recalcNormals(const std::vector<int>& chunkIndices) {
if (!terrain_) return;
float unitSize = CHUNK_SIZE / 8.0f;
for (int ci : chunkIndices) {
auto& chunk = terrain_->chunks[ci];
if (!chunk.hasHeightMap()) continue;
for (int i = 0; i < 145; i++) {
int row = i / 17;
int col = i % 17;
// Get heights of neighbors
float hC = chunk.heightMap.heights[i];
float hL = hC, hR = hC, hU = hC, hD = hC;
if (col <= 8) {
// Outer vertex
int li = row * 17 + std::max(0, col - 1);
int ri = row * 17 + std::min(8, col + 1);
int ui = std::max(0, row - 1) * 17 + col;
int di = std::min(8, row + 1) * 17 + col;
hL = chunk.heightMap.heights[li];
hR = chunk.heightMap.heights[ri];
hU = chunk.heightMap.heights[ui];
hD = chunk.heightMap.heights[di];
} else {
// Inner vertex — use adjacent outer verts
int innerCol = col - 9;
int tl = row * 17 + innerCol;
int tr = row * 17 + innerCol + 1;
int bl = (row + 1) * 17 + innerCol;
int br = (row + 1) * 17 + innerCol + 1;
if (tl >= 0 && tl < 145) hU = chunk.heightMap.heights[tl];
if (tr >= 0 && tr < 145) hR = chunk.heightMap.heights[tr];
if (bl >= 0 && bl < 145) hD = chunk.heightMap.heights[bl];
if (br >= 0 && br < 145) hL = chunk.heightMap.heights[br];
}
// Compute normal from height differences
float dx = (hL - hR) / (2.0f * unitSize);
float dy = (hU - hD) / (2.0f * unitSize);
float len = std::sqrt(dx * dx + dy * dy + 1.0f);
glm::vec3 n(dx / len, dy / len, 1.0f / len);
chunk.normals[i * 3 + 0] = static_cast<int8_t>(n.x * 127.0f);
chunk.normals[i * 3 + 1] = static_cast<int8_t>(n.y * 127.0f);
chunk.normals[i * 3 + 2] = static_cast<int8_t>(n.z * 127.0f);
}
}
}
void TerrainEditor::redo() {
if (!terrain_) return;
history_.redo(*terrain_);
for (int idx : history_.lastAffectedChunks()) {
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), idx) == dirtyChunks_.end())
dirtyChunks_.push_back(idx);
}
}
void TerrainEditor::setWaterLevel(const glm::vec3& center, float radius,
float waterHeight, uint16_t liquidType) {
if (!terrain_) return;
auto affected = getAffectedChunks(center, radius);
for (int chunkIdx : affected) {
auto& water = terrain_->waterData[chunkIdx];
if (water.layers.empty()) {
pipeline::ADTTerrain::WaterLayer wl;
wl.liquidType = liquidType;
wl.flags = 0;
wl.minHeight = waterHeight;
wl.maxHeight = waterHeight;
wl.x = 0;
wl.y = 0;
wl.width = 9;
wl.height = 9;
wl.heights.assign(81, waterHeight);
wl.mask.assign(8, 0xFF);
water.layers.push_back(wl);
} else {
auto& wl = water.layers[0];
wl.minHeight = waterHeight;
wl.maxHeight = waterHeight;
wl.liquidType = liquidType;
std::fill(wl.heights.begin(), wl.heights.end(), waterHeight);
}
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), chunkIdx) == dirtyChunks_.end())
dirtyChunks_.push_back(chunkIdx);
dirty_ = true;
}
}
void TerrainEditor::removeWater(const glm::vec3& center, float radius) {
if (!terrain_) return;
auto affected = getAffectedChunks(center, radius);
for (int chunkIdx : affected) {
terrain_->waterData[chunkIdx].layers.clear();
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), chunkIdx) == dirtyChunks_.end())
dirtyChunks_.push_back(chunkIdx);
dirty_ = true;
}
}
void TerrainEditor::applyErode(float dt) {
float factor = std::min(1.0f, brush_.settings().strength * dt * 0.3f);
auto affected = getAffectedChunks(brush_.getPosition(), brush_.settings().radius);
for (int chunkIdx : affected) {
bool modified = false;
auto& chunk = terrain_->chunks[chunkIdx];
for (int v = 0; v < 145; v++) {
glm::vec3 pos = chunkVertexWorldPos(chunkIdx, v);
float dist = glm::length(glm::vec2(pos.x - brush_.getPosition().x,
pos.y - brush_.getPosition().y));
float influence = brush_.getInfluence(dist);
if (influence <= 0.0f) continue;
float h = chunk.heightMap.heights[v];
int row = v / 17, col = v % 17;
// Find lowest neighbor (same chunk)
float lowestH = h;
if (col <= 8) {
int neighbors[] = {v - 17, v + 17, v - 1, v + 1};
for (int n : neighbors) {
if (n >= 0 && n < 145)
lowestH = std::min(lowestH, chunk.heightMap.heights[n]);
}
}
// Move height toward lowest neighbor (erosion)
float slope = h - lowestH;
if (slope > 0.1f) {
float erosion = slope * factor * influence * 0.3f;
chunk.heightMap.heights[v] -= erosion;
modified = true;
}
}
if (modified) {
stitchEdges(chunkIdx);
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), chunkIdx) == dirtyChunks_.end())
dirtyChunks_.push_back(chunkIdx);
dirty_ = true;
}
}
}
void TerrainEditor::applyNoise(float frequency, float amplitude, int octaves, uint32_t seed) {
if (!terrain_) return;
// Simple value noise with octaves
auto hash2d = [](int x, int y, uint32_t s) -> float {
uint32_t h = static_cast<uint32_t>(x * 374761393 + y * 668265263 + s * 1274126177);
h = (h ^ (h >> 13)) * 1274126177;
h = h ^ (h >> 16);
return static_cast<float>(h & 0xFFFF) / 65535.0f * 2.0f - 1.0f;
};
auto smoothNoise = [&](float fx, float fy, uint32_t s) -> float {
int ix = static_cast<int>(std::floor(fx));
int iy = static_cast<int>(std::floor(fy));
float fracX = fx - ix;
float fracY = fy - iy;
// Smoothstep
fracX = fracX * fracX * (3.0f - 2.0f * fracX);
fracY = fracY * fracY * (3.0f - 2.0f * fracY);
float v00 = hash2d(ix, iy, s);
float v10 = hash2d(ix + 1, iy, s);
float v01 = hash2d(ix, iy + 1, s);
float v11 = hash2d(ix + 1, iy + 1, s);
float i0 = v00 + (v10 - v00) * fracX;
float i1 = v01 + (v11 - v01) * fracX;
return i0 + (i1 - i0) * fracY;
};
for (int ci = 0; ci < 256; ci++) {
auto& chunk = terrain_->chunks[ci];
if (!chunk.hasHeightMap()) continue;
int cx = ci % 16, cy = ci / 16;
for (int v = 0; v < 145; v++) {
glm::vec3 wpos = chunkVertexWorldPos(ci, v);
float total = 0.0f;
float amp = amplitude;
float freq = frequency;
for (int o = 0; o < octaves; o++) {
total += smoothNoise(wpos.x * freq, wpos.y * freq, seed + o * 97) * amp;
freq *= 2.0f;
amp *= 0.5f;
}
chunk.heightMap.heights[v] += total;
}
dirtyChunks_.push_back(ci);
}
dirty_ = true;
}
void TerrainEditor::punchHole(const glm::vec3& center, float radius) {
if (!terrain_) return;
auto affected = getAffectedChunks(center, radius);
for (int ci : affected) {
auto& chunk = terrain_->chunks[ci];
// Each chunk has 8x8 quads, holes use a 4x4 bitmask (each bit covers 2x2 quads)
for (int hy = 0; hy < 4; hy++) {
for (int hx = 0; hx < 4; hx++) {
// Center of this 2x2 quad group
int cx = ci % 16, cy = ci / 16;
float tileNW_X = (32.0f - static_cast<float>(terrain_->coord.y)) * TILE_SIZE;
float tileNW_Y = (32.0f - static_cast<float>(terrain_->coord.x)) * TILE_SIZE;
float qx = tileNW_X - cy * CHUNK_SIZE - (hy * 2 + 1) * CHUNK_SIZE / 8.0f;
float qy = tileNW_Y - cx * CHUNK_SIZE - (hx * 2 + 1) * CHUNK_SIZE / 8.0f;
float dist = std::sqrt((qx - center.x) * (qx - center.x) +
(qy - center.y) * (qy - center.y));
if (dist < radius) {
int bit = 1 << (hy * 4 + hx);
chunk.holes |= static_cast<uint16_t>(bit);
}
}
}
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), ci) == dirtyChunks_.end())
dirtyChunks_.push_back(ci);
dirty_ = true;
}
}
void TerrainEditor::fillHole(const glm::vec3& center, float radius) {
if (!terrain_) return;
auto affected = getAffectedChunks(center, radius);
for (int ci : affected) {
auto& chunk = terrain_->chunks[ci];
for (int hy = 0; hy < 4; hy++) {
for (int hx = 0; hx < 4; hx++) {
int cx = ci % 16, cy = ci / 16;
float tileNW_X = (32.0f - static_cast<float>(terrain_->coord.y)) * TILE_SIZE;
float tileNW_Y = (32.0f - static_cast<float>(terrain_->coord.x)) * TILE_SIZE;
float qx = tileNW_X - cy * CHUNK_SIZE - (hy * 2 + 1) * CHUNK_SIZE / 8.0f;
float qy = tileNW_Y - cx * CHUNK_SIZE - (hx * 2 + 1) * CHUNK_SIZE / 8.0f;
float dist = std::sqrt((qx - center.x) * (qx - center.x) +
(qy - center.y) * (qy - center.y));
if (dist < radius) {
int bit = 1 << (hy * 4 + hx);
chunk.holes &= ~static_cast<uint16_t>(bit);
}
}
}
if (std::find(dirtyChunks_.begin(), dirtyChunks_.end(), ci) == dirtyChunks_.end())
dirtyChunks_.push_back(ci);
dirty_ = true;
}
}
} // namespace editor
} // namespace wowee
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