From 0fa4a8542bf9eda8bd9c28da199b3e90e04279b9 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Tue, 22 Nov 2022 03:19:29 +0100
Subject: wip

---
 src/anim-atlas.cpp    | 19 ++++++++++++++++++-
 src/anim-atlas.hpp    |  6 ++++++
 src/camera-offset.cpp |  2 +-
 3 files changed, 25 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/anim-atlas.cpp b/src/anim-atlas.cpp
index b566d19f..345ca63e 100644
--- a/src/anim-atlas.cpp
+++ b/src/anim-atlas.cpp
@@ -2,6 +2,7 @@
 #include "compat/assert.hpp"
 #include "shaders/tile.hpp"
 #include "tile-defs.hpp"
+#include <Corrade/Containers/BitArrayView.h>
 #include <Magnum/Math/Color.h>
 #include <Magnum/GL/TextureFormat.h>
 
@@ -31,7 +32,7 @@ decltype(anim_atlas::_group_indices) anim_atlas::make_group_indices(const anim_d
 
 anim_atlas::anim_atlas() noexcept = default;
 anim_atlas::anim_atlas(StringView name, const ImageView2D& image, anim_def info) noexcept :
-    _name{name},
+    _name{name}, _bitmask{make_bit_array(image)},
     _info{std::move(info)}, _group_indices{make_group_indices(_info)}
 {
     _tex.setWrapping(GL::SamplerWrapping::ClampToEdge)
@@ -99,4 +100,20 @@ auto anim_atlas::frame_quad(const Vector3& center, rotation r, std::size_t i) co
     }};
 }
 
+BitArray anim_atlas::make_bit_array(const ImageView2D& tex)
+{
+    fm_assert(tex.pixelSize() == 4);
+    const auto size = (std::size_t)tex.size().product();
+    BitArray array{NoInit, size};
+    const char* __restrict data = tex.data().data();
+    for (std::size_t i = 0; i < size; i++)
+        array.set(i, data[i * 4 + 3] != 0);
+    return array;
+}
+
+BitArrayView anim_atlas::bitmask() const
+{
+    return _bitmask;
+}
+
 } // namespace floormat
diff --git a/src/anim-atlas.hpp b/src/anim-atlas.hpp
index e3e7243d..ce0e6176 100644
--- a/src/anim-atlas.hpp
+++ b/src/anim-atlas.hpp
@@ -3,6 +3,8 @@
 #include "scenery.hpp"
 #include "anim.hpp"
 #include <array>
+#include <Corrade/Containers/BitArray.h>
+#include <Corrade/Containers/BitArrayView.h>
 #include <Corrade/Containers/String.h>
 #include <Magnum/Math/Vector2.h>
 #include <Magnum/ImageView.h>
@@ -31,11 +33,14 @@ struct anim_atlas final
     texcoords texcoords_for_frame(rotation r, std::size_t frame) const noexcept;
     quad frame_quad(const Vector3& center, rotation r, std::size_t frame) const noexcept;
 
+    BitArrayView bitmask() const;
+
     fm_DECLARE_DELETED_COPY_ASSIGNMENT(anim_atlas);
 
 private:
     GL::Texture2D _tex;
     String _name;
+    BitArray _bitmask;
     anim_def _info;
     std::array<std::uint8_t, (std::size_t)rotation_COUNT> _group_indices = {
         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
@@ -43,6 +48,7 @@ private:
 
     static decltype(_group_indices) make_group_indices(const anim_def& anim) noexcept;
     static std::uint8_t rotation_to_index(const anim_def& a, rotation r) noexcept;
+    static BitArray make_bit_array(const ImageView2D& tex);
 };
 
 } // namespace floormat
diff --git a/src/camera-offset.cpp b/src/camera-offset.cpp
index b132cdab..335a9b65 100644
--- a/src/camera-offset.cpp
+++ b/src/camera-offset.cpp
@@ -11,7 +11,7 @@ with_shifted_camera_offset::with_shifted_camera_offset(tile_shader& shader, shor
     _offset{shader.camera_offset()}
 {
     constexpr auto chunk_size = TILE_MAX_DIM20d*dTILE_SIZE;
-    const auto offset = _offset +  tile_shader::project(Vector3d(x, y, 0) * chunk_size);
+    const auto offset = _offset + tile_shader::project(Vector3d(x, y, 0) * chunk_size);
     _shader.set_camera_offset(offset);
 }
 
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