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#include "water.h"
#include "game/geoData.h"
#include "gfx/models/texture.h"
#include <algorithm>
#include <cstddef>
#include <gfx/gl/sceneShader.h>
#include <gfx/gl/shadowMapper.h>
#include <gfx/image.h>
#include <gfx/models/mesh.h>
#include <gfx/models/vertex.h>
#include <glm/glm.hpp>
#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;
std::vector<Vertex> vertices;
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);
}
void
Water::tick(TickDuration dur)
{
waveCycle += dur.count();
}
void
Water::render(const SceneShader & shader) const
{
shader.water.use(waveCycle);
water->bind();
meshes.apply(&Mesh::Draw);
}
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