Shuffle stuff around

- Use the new and improved hierarchy I figured out when making Prospero chat
- Re-add NSIS scripts, again from Prospero
- Update most build and utility scripts with their most recent versions

1 files changed, 173 insertions, 0 deletions

diff --git a/src/game/shared/entity/collision.cc b/src/game/shared/entity/collision.cc
new file mode 100644
index 0000000..bc9209b
--- /dev/null
+++ b/src/game/shared/entity/collision.cc
@@ -0,0 +1,173 @@
+#include "shared/pch.hh"
+
+#include "shared/entity/collision.hh"
+
+#include "core/math/constexpr.hh"
+
+#include "shared/entity/gravity.hh"
+#include "shared/entity/grounded.hh"
+#include "shared/entity/transform.hh"
+#include "shared/entity/velocity.hh"
+
+#include "shared/world/dimension.hh"
+#include "shared/world/voxel_registry.hh"
+
+#include "shared/coord.hh"
+#include "shared/globals.hh"
+
+static int vgrid_collide(const world::Dimension* dimension, int d, entity::Collision& collision, entity::Transform& transform,
+    entity::Velocity& velocity, world::VoxelMaterial& touch_surface)
+{
+    const auto move = globals::fixed_frametime * velocity.value[d];
+    const auto move_sign = math::sign<int>(move);
+
+    const auto& ref_aabb = collision.aabb;
+    const auto current_aabb = ref_aabb.push(transform.local);
+
+    auto next_aabb = math::AABBf(current_aabb);
+    next_aabb.min[d] += move;
+    next_aabb.max[d] += move;
+
+    local_pos lpos_min;
+    lpos_min.x = static_cast<local_pos::value_type>(glm::floor(next_aabb.min.x));
+    lpos_min.y = static_cast<local_pos::value_type>(glm::floor(next_aabb.min.y));
+    lpos_min.z = static_cast<local_pos::value_type>(glm::floor(next_aabb.min.z));
+
+    local_pos lpos_max;
+    lpos_max.x = static_cast<local_pos::value_type>(glm::ceil(next_aabb.max.x));
+    lpos_max.y = static_cast<local_pos::value_type>(glm::ceil(next_aabb.max.y));
+    lpos_max.z = static_cast<local_pos::value_type>(glm::ceil(next_aabb.max.z));
+
+    // Other axes
+    const int u = (d + 1) % 3;
+    const int v = (d + 2) % 3;
+
+    local_pos::value_type ddir;
+    local_pos::value_type dmin;
+    local_pos::value_type dmax;
+
+    if(move < 0.0f) {
+        ddir = local_pos::value_type(+1);
+        dmin = lpos_min[d];
+        dmax = lpos_max[d];
+    }
+    else {
+        ddir = local_pos::value_type(-1);
+        dmin = lpos_max[d];
+        dmax = lpos_min[d];
+    }
+
+    world::VoxelTouch latch_touch = world::VTOUCH_NONE;
+    glm::fvec3 latch_values = glm::fvec3(0.0f, 0.0f, 0.0f);
+    world::VoxelMaterial latch_surface = world::VMAT_UNKNOWN;
+    math::AABBf latch_vbox;
+
+    for(auto i = dmin; i != dmax; i += ddir) {
+        for(auto j = lpos_min[u]; j < lpos_max[u]; ++j)
+            for(auto k = lpos_min[v]; k < lpos_max[v]; ++k) {
+                local_pos lpos;
+                lpos[d] = i;
+                lpos[u] = j;
+                lpos[v] = k;
+
+                auto vpos = coord::to_voxel(transform.chunk, lpos);
+                auto voxel = dimension->get_voxel(vpos);
+
+                if(voxel == nullptr) {
+                    // Don't collide with something
+                    // that we assume to be nothing
+                    continue;
+                }
+
+                math::AABBf vbox(voxel->get_collision().push(lpos));
+
+                if(!next_aabb.intersect(vbox)) {
+                    // No intersection between the voxel
+                    // and the entity's collision hull
+                    continue;
+                }
+
+                if(voxel->is_touch_type<world::VTOUCH_SOLID>()) {
+                    // Solid touch type makes a collision
+                    // response whenever it is encountered
+                    velocity.value[d] = 0.0f;
+                    touch_surface = voxel->get_surface_material();
+                    return move_sign;
+                }
+
+                // In case of other touch types, they
+                // are latched and the last ever touch
+                // type is then responded to
+                if(voxel->get_touch_type() != world::VTOUCH_NONE) {
+                    latch_touch = voxel->get_touch_type();
+                    latch_values = voxel->get_touch_values();
+                    latch_surface = voxel->get_surface_material();
+                    latch_vbox = vbox;
+                    continue;
+                }
+            }
+    }
+
+    if(latch_touch != world::VTOUCH_NONE) {
+        if(latch_touch == world::VTOUCH_BOUNCE) {
+            const auto move_distance = glm::abs(current_aabb.min[d] - next_aabb.min[d]);
+            const auto threshold = 2.0f * globals::fixed_frametime;
+
+            if(move_distance > threshold) {
+                velocity.value[d] *= -latch_values[d];
+            }
+            else {
+                velocity.value[d] = 0.0f;
+            }
+
+            touch_surface = latch_surface;
+
+            return move_sign;
+        }
+
+        if(latch_touch == world::VTOUCH_SINK) {
+            velocity.value[d] *= latch_values[d];
+            touch_surface = latch_surface;
+            return move_sign;
+        }
+    }
+
+    return 0;
+}
+
+void entity::Collision::fixed_update(world::Dimension* dimension)
+{
+    // FIXME: this isn't particularly accurate considering
+    // some voxels might be passable and some other voxels
+    // might apply some slowing factor; what I might do in the
+    // future is to add a specific value to the voxel registry
+    // entries that would specify the amount of force we apply
+    // to prevent player movement inside a specific voxel, plus
+    // we shouldn't treat all voxels as full cubes if we want
+    // to support slabs, stairs and non-full liquid voxels in the future
+
+    auto group = dimension->entities.group<entity::Collision>(entt::get<entity::Transform, entity::Velocity>);
+
+    for(auto [entity, collision, transform, velocity] : group.each()) {
+        auto surface = world::VMAT_UNKNOWN;
+        auto vertical_move = vgrid_collide(dimension, 1, collision, transform, velocity, surface);
+
+        if(dimension->entities.any_of<entity::Gravity>(entity)) {
+            if(vertical_move == math::sign<int>(dimension->get_gravity())) {
+                dimension->entities.emplace_or_replace<entity::Grounded>(entity, entity::Grounded { surface });
+            }
+            else {
+                dimension->entities.remove<entity::Grounded>(entity);
+            }
+        }
+        else {
+            // The entity cannot be grounded because the component
+            // setup of said entity should not let it comprehend the
+            // concept of resting on the ground (it flies around)
+            dimension->entities.remove<entity::Grounded>(entity);
+        }
+
+        vgrid_collide(dimension, 0, collision, transform, velocity, surface);
+        vgrid_collide(dimension, 2, collision, transform, velocity, surface);
+    }
+}