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#include "rail.h"
#include "game/gamestate.h"
#include "network.h"
#include <game/network/network.impl.h> // IWYU pragma: keep
#include <gfx/gl/sceneShader.h>
#include <gfx/gl/vertexArrayObject.h>
#include <gfx/models/texture.h>
template class NetworkOf<RailLink, RailLinkStraight, RailLinkCurve>;
constexpr auto RAIL_CROSSSECTION_VERTICES {5U};
constexpr Size3D RAIL_HEIGHT {0, 0, 50.F};
RailLinks::RailLinks() : NetworkOf<RailLink, RailLinkStraight, RailLinkCurve> {"rails.jpg"} { }
void
RailLinks::tick(TickDuration)
{
}
namespace {
constexpr const std::array<RelativePosition3D, RAIL_CROSSSECTION_VERTICES> RAIL_CROSS_SECTION {{
{-1330.F, 0.F, 0},
{-608.F, 0.F, RAIL_HEIGHT.z},
{0, 0.F, RAIL_HEIGHT.z / 2},
{608.F, 0.F, RAIL_HEIGHT.z},
{1330.F, 0.F, 0},
}};
constexpr const std::array<float, RAIL_CROSSSECTION_VERTICES> RAIL_TEXTURE_POS {
0.15F,
.34F,
.5F,
.66F,
0.85F,
};
template<std::floating_point T> constexpr T SLEEPERS_PER_TEXTURE {5};
template<std::floating_point T> constexpr T TEXTURE_LENGTH {2'000};
template<std::floating_point T> constexpr T SLEEPER_LENGTH {T {1} / SLEEPERS_PER_TEXTURE<T>};
template<std::floating_point T>
constexpr auto
roundSleepers(const T length)
{
return round_frac(length / TEXTURE_LENGTH<T>, SLEEPER_LENGTH<T>);
}
}
RailLinkStraight::RailLinkStraight(NetworkLinkHolder<RailLinkStraight> & instances, const Node::Ptr & nodeA,
const Node::Ptr & nodeB) : RailLinkStraight(instances, nodeA, nodeB, nodeB->pos - nodeA->pos)
{
}
RailLinkStraight::RailLinkStraight(NetworkLinkHolder<RailLinkStraight> & instances, Node::Ptr nodeA, Node::Ptr nodeB,
const RelativePosition3D & diff) :
Link({.node = std::move(nodeA), .dir = vector_yaw(diff)}, {.node = std::move(nodeB), .dir = vector_yaw(-diff)},
glm::length(diff)),
instance {instances.vertices.acquire(
ends[0].node->pos, ends[1].node->pos, flat_orientation(diff), roundSleepers(length))}
{
}
RailLinkCurve::RailLinkCurve(NetworkLinkHolder<RailLinkCurve> & instances, const Node::Ptr & nodeA,
const Node::Ptr & nodeB, GlobalPosition2D centre) :
RailLinkCurve(instances, nodeA, nodeB, centre || nodeA->pos.z, ::distance<2>(nodeA->pos.xy(), centre),
{centre, nodeA->pos, nodeB->pos})
{
}
RailLinkCurve::RailLinkCurve(NetworkLinkHolder<RailLinkCurve> & instances, const Node::Ptr & nodeA,
const Node::Ptr & nodeB, GlobalPosition3D centre, RelativeDistance radius, const Arc arc) :
Link({.node = nodeA, .dir = normalize(arc.first + half_pi)},
{.node = nodeB, .dir = normalize(arc.second - half_pi)},
glm::length(RelativePosition2D {radius * arc.length(), difference(nodeA->pos, nodeB->pos).z})),
LinkCurve {centre, radius, arc}, instance {instances.vertices.acquire(ends[0].node->pos, ends[1].node->pos, centre,
roundSleepers(length), half_pi - arc.first, half_pi - arc.second, radius)}
{
}
RelativePosition3D
RailLink::vehiclePositionOffset() const
{
return RAIL_HEIGHT;
}
template<> NetworkLinkHolder<RailLinkStraight>::NetworkLinkHolder()
{
VertexArrayObject {vao}
.addAttribs<RailLinkStraight::Vertex, &RailLinkStraight::Vertex::a, &RailLinkStraight::Vertex::b,
&RailLinkStraight::Vertex::rotation, &RailLinkStraight::Vertex::textureRepeats>(
vertices.bufferName());
}
template<> NetworkLinkHolder<RailLinkCurve>::NetworkLinkHolder()
{
VertexArrayObject {vao}
.addAttribs<RailLinkCurve::Vertex, &RailLinkCurve::Vertex::a, &RailLinkCurve::Vertex::b,
&RailLinkCurve::Vertex::c, &RailLinkCurve::Vertex::textureRepeats, &RailLinkCurve::Vertex::aangle,
&RailLinkCurve::Vertex::bangle, &RailLinkCurve::Vertex::radius>(vertices.bufferName());
}
namespace {
template<typename LinkType>
void
renderType(const NetworkLinkHolder<LinkType> & networkLinks, auto & shader)
{
if (auto count = networkLinks.vertices.size()) {
shader.use(RAIL_CROSS_SECTION, RAIL_TEXTURE_POS);
glBindVertexArray(networkLinks.vao);
glDrawArrays(GL_POINTS, 0, static_cast<GLsizei>(count));
}
};
}
void
RailLinks::render(const SceneShader & shader, const Frustum &) const
{
if (anyLinks()) {
texture->bind();
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(-1, 0);
renderType<RailLinkStraight>(*this, shader.networkStraight);
renderType<RailLinkCurve>(*this, shader.networkCurve);
glDisable(GL_POLYGON_OFFSET_FILL);
glBindVertexArray(0);
}
}
const Surface *
RailLinks::getBaseSurface() const
{
return gameState->assets.at("terrain.surface.gravel").dynamicCast<const Surface>().get();
}
RelativeDistance
RailLinks::getBaseWidth() const
{
static constexpr auto BASE_WIDTH = 5'700;
return BASE_WIDTH;
}
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