Separate transparent water mesh (not sorted, bad)

1 files changed, 68 insertions, 1 deletions

diff --git a/src/World/Generation/ChunkMeshing.hpp b/src/World/Generation/ChunkMeshing.hpp
index dd9446b..75023f5 100644
--- a/src/World/Generation/ChunkMeshing.hpp
+++ b/src/World/Generation/ChunkMeshing.hpp
@@ -9,6 +9,73 @@ struct ChunkNeighbors {
     Chunk *north, *east, *south, *west;
     Chunk *north_east, *south_east, *south_west, *north_west;
 };
-GFX::Mesh create_mesh_for_chunk(Chunk& chunk, const ChunkNeighbors& neighbors);
 
+struct ChunkMesh { GFX::Mesh land_mesh, water_mesh; };
+ChunkMesh mesh_chunk(Chunk& chunk, const ChunkNeighbors& neighbors);
+
+namespace Detail {
+
+template <typename Decisions>
+GFX::Mesh create_mesh(Chunk& chunk, const ChunkNeighbors& neighbors) {
+    std::vector<Vector<3, F32>> positions{};
+    std::vector<Vector<3, F32>> normals{};
+    std::vector<Vector<2, F32>> tex_coords{};
+    std::vector<F32> ambient_occlusion_values{};
+    std::vector<U32> indices{};
+
+    for (Int x = 0; x < Chunk::Width; x++) {
+        for (Int y = 0; y < Chunk::Height; y++) {
+            for (Int z = 0; z < Chunk::Width; z++) {
+                auto block = chunk.get(x, y, z);
+                if (Decisions::should_ignore_block(block))
+                    continue;
+
+                for (auto side: BlockSide::all()) {
+                    if (!Decisions::is_face_visible(chunk, neighbors, x, y, z, side))
+                        continue;
+
+                    auto side_positions = Decisions::face_positions(side, x, y, z);
+                    auto side_normals = Decisions::face_normals(side);
+                    auto side_tex_coords = Decisions::face_tex_coords(block.type, side);
+                    auto side_ao = Decisions::face_ao_values(chunk, neighbors, x, y, z, side);
+
+                    U32 s = positions.size();
+
+                    positions.insert(positions.end(), side_positions.begin(), side_positions.end());
+                    normals.insert(normals.end(), side_normals.begin(), side_normals.end());
+                    tex_coords.insert(tex_coords.end(), side_tex_coords.begin(), side_tex_coords.end());
+                    ambient_occlusion_values.insert(ambient_occlusion_values.end(), side_ao.begin(), side_ao.end());
+                    indices.insert(indices.end(), {s + 0, s + 1, s + 2, s + 2, s + 3, s + 0 });
+                }
+            }
+        }
+    }
+
+    return {
+        {positions, normals, tex_coords, ambient_occlusion_values},
+        indices,
+    };
+}
+
+class DefaultMeshDecisions {
+public:
+    static std::array<Vector<3, F32>, 4> face_positions(BlockSide side, U32 x, U32 y, U32 z);
+    static std::array<Vector<2, F32>, 4> face_tex_coords(BlockType type, BlockSide side);
+    static std::array<Vector<3, F32>, 4> face_normals(BlockSide side);
+    static std::array<F32, 4> face_ao_values(Chunk& chunk, const ChunkNeighbors& neighbors, U32 x, U32 y, U32 z, BlockSide side);
+
+    static Chunk::BlockData get_block_wrapping(const Chunk& chunk, const ChunkNeighbors& neighbors, Vector<3, I32> pos);
+    static Vector<3, I32> get_face_normal(BlockSide side);
+
+    static Bool is_face_visible(Chunk& chunk, const ChunkNeighbors& neighbors, U32 x, U32 y, U32 z, BlockSide side);
+    static Bool should_ignore_block(Chunk::BlockData block);
+};
+
+class WaterMeshDecisions final : public DefaultMeshDecisions {
+public:
+    static Bool is_face_visible(Chunk& chunk, const ChunkNeighbors& neighbors, U32 x, U32 y, U32 z, BlockSide side);
+    static Bool should_ignore_block(Chunk::BlockData block);
+};
+
+}
 }