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-rw-r--r--game/water.cpp76
1 files changed, 61 insertions, 15 deletions
diff --git a/game/water.cpp b/game/water.cpp
index 1c0e9ca..3dc1916 100644
--- a/game/water.cpp
+++ b/game/water.cpp
@@ -12,34 +12,80 @@
#include <iterator>
#include <location.h>
#include <maths.h>
+#include <set>
#include <utility>
#include <vector>
+namespace glm {
+ bool
+ operator<(const GlobalPosition2D a, const GlobalPosition2D b)
+ {
+ return std::tie(a.x, a.y) < std::tie(b.x, b.y);
+ }
+}
+
Water::Water(std::shared_ptr<GeoData> tm) : geoData {std::move(tm)}, water {std::make_shared<Texture>("water.png")}
{
generateMeshes();
}
+static constexpr GlobalDistance MIN_HEIGHT = 1'000;
+static constexpr GlobalDistance TILE_SIZE = 8'192;
+static constexpr GlobalDistance BORDER = TILE_SIZE / 2;
+
void
Water::generateMeshes()
{
+ // Map out where a water square needs to exist to cover all terrain faces with a low vertex
+ std::set<GlobalPosition2D> waterPositions;
+ std::for_each(geoData->vertices_sbegin(), geoData->vertices_end(), [this, &waterPositions](const auto vh) {
+ if (geoData->point(vh).z < MIN_HEIGHT) {
+ std::for_each(geoData->vf_begin(vh), geoData->vf_end(vh),
+ [done = std::set<OpenMesh::FaceHandle>(), this, &waterPositions](const auto fh) mutable {
+ if (done.insert(fh).second) {
+ const auto getrange = [this, fh](glm::length_t axis) {
+ const auto mme = std::minmax_element(geoData->fv_begin(fh), geoData->fv_end(fh),
+ [this, axis](const auto vh1, const auto vh2) {
+ return geoData->point(vh1)[axis] < geoData->point(vh2)[axis];
+ });
+
+ return std::make_pair((geoData->point(*mme.first)[axis] - BORDER) / TILE_SIZE,
+ (geoData->point(*mme.second)[axis] + BORDER) / TILE_SIZE);
+ };
+ const auto xrange = getrange(0);
+ const auto yrange = getrange(1);
+ for (auto x = xrange.first; x < xrange.second; x++) {
+ for (auto y = yrange.first; y < yrange.second; y++) {
+ waterPositions.emplace(x, y);
+ }
+ }
+ }
+ });
+ }
+ });
+
std::vector<unsigned int> indices;
- indices.reserve(geoData->n_faces() * 3);
std::vector<Vertex> vertices;
- vertices.reserve(geoData->n_vertices());
- std::map<GeoData::VertexHandle, size_t> vertexIndex;
- std::transform(geoData->vertices_sbegin(), geoData->vertices_end(), std::back_inserter(vertices),
- [this, &vertexIndex](const GeoData::VertexHandle v) {
- vertexIndex.emplace(v, vertexIndex.size());
- const auto p = geoData->point(v);
- return Vertex {p, RelativePosition2D(p) / 10000.F, geoData->normal(v)};
- });
- std::for_each(
- geoData->faces_sbegin(), geoData->faces_end(), [this, &vertexIndex, &indices](const GeoData::FaceHandle f) {
- std::transform(geoData->fv_begin(f), geoData->fv_end(f), std::back_inserter(indices),
- [&vertexIndex](const GeoData::VertexHandle v) {
- return vertexIndex[v];
- });
+ std::map<GlobalPosition2D, size_t> vertexIndex;
+ std::for_each(waterPositions.begin(), waterPositions.end(),
+ [&indices, &vertices, &vertexIndex, extents = geoData->getExtents(), this](const GlobalPosition2D p) {
+ std::array<unsigned int, 4> currentIndices {};
+ auto out = currentIndices.begin();
+ for (auto x : {0, TILE_SIZE}) {
+ for (auto y : {0, TILE_SIZE}) {
+ const auto pos = (p * TILE_SIZE) + GlobalPosition2D {x, y};
+ const auto v = vertexIndex.emplace(pos, vertices.size());
+ if (v.second) {
+ const auto cpos = glm::clamp(pos, std::get<0>(extents).xy(), std::get<1>(extents).xy());
+ vertices.emplace_back(RelativePosition3D {geoData->positionAt(cpos)},
+ TextureRelCoord(pos / TILE_SIZE), up);
+ }
+ *out++ = static_cast<unsigned int>(v.first->second);
+ }
+ }
+ for (const auto i : {0U, 3U, 1U, 0U, 2U, 3U}) {
+ indices.push_back(currentIndices[i]);
+ }
});
meshes.create<Mesh>(vertices, indices);
}