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#include "terrain.h"
#include "game/geoData.h"
#include "gfx/models/texture.h"
#include <algorithm>
#include <array>
#include <cache.h>
#include <cstddef>
#include <filesystem>
#include <gfx/gl/sceneShader.h>
#include <gfx/image.h>
#include <gfx/models/mesh.h>
#include <gfx/models/vertex.hpp>
#include <glm/glm.hpp>
#include <iterator>
#include <location.hpp>
#include <maths.h>
#include <utility>
#include <vector>
Terrain::Terrain(std::shared_ptr<GeoData> gd) :
geoData {std::move(gd)}, grass {Texture::cachedTexture.get("grass.png")}, water {Texture::cachedTexture.get(
"water.png")}
{
generateMeshes();
}
void
Terrain::generateMeshes()
{
std::vector<unsigned int> indices;
const auto isize = geoData->getSize() - glm::uvec2 {1, 1};
indices.reserve(static_cast<std::size_t>(isize.x * isize.y) * 6);
const auto limit = geoData->getLimit();
// Indices
constexpr std::array<glm::ivec2, 6> indices_offsets {{
{0, 0},
{1, 0},
{1, 1},
{0, 0},
{1, 1},
{0, 1},
}};
for (auto y = limit.first.y; y < limit.second.y; y += 1) {
for (auto x = limit.first.x; x < limit.second.x; x += 1) {
std::transform(indices_offsets.begin(), indices_offsets.end(), std::back_inserter(indices),
[this, x, y](const auto off) {
return geoData->at(x + off.x, y + off.y);
});
}
}
const auto nodes = geoData->getNodes();
const auto scale = geoData->getScale();
std::vector<Vertex> vertices;
vertices.reserve(nodes.size());
// Positions
for (auto y = limit.first.y; y <= limit.second.y; y += 1) {
for (auto x = limit.first.x; x <= limit.second.x; x += 1) {
const glm::vec2 xy {x, y};
vertices.emplace_back((xy * scale) ^ nodes[geoData->at(x, y)].height, xy, ::up);
}
}
// Normals
const glm::uvec2 size = geoData->getSize();
for (auto y = limit.first.y + 1; y < limit.second.y; y += 1) {
for (auto x = limit.first.x + 1; x < limit.second.x; x += 1) {
const auto n {geoData->at(x, y)};
const auto a = vertices[n - 1].pos;
const auto b = vertices[n - size.x].pos;
const auto c = vertices[n + 1].pos;
const auto d = vertices[n + size.x].pos;
vertices[n].normal = -glm::normalize(glm::cross(b - d, a - c));
}
}
meshes.create<Mesh>(vertices, indices);
}
void
Terrain::tick(TickDuration dur)
{
waveCycle += dur.count();
}
void
Terrain::render(const SceneShader & shader) const
{
shader.setModel(Location {}, SceneShader::Program::LandMass);
grass->bind();
meshes.apply(&Mesh::Draw);
shader.setModel(Location {}, SceneShader::Program::Water);
shader.setUniform("waves", {waveCycle, 0, 0});
water->bind();
meshes.apply(&Mesh::Draw);
}
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