1 files changed, 49 insertions, 0 deletions
diff --git a/chunk.cpp b/chunk.cpp
new file mode 100644
index 00000000..87cbe0cf
--- /dev/null
+++ b/chunk.cpp
@@ -0,0 +1,49 @@
+#include "chunk.hpp"
+
+namespace Magnum::Examples {
+
+chunk_sampler_array::chunk_sampler_array()
+{
+    samplers.reserve(MAX_SAMPLERS);
+}
+
+void chunk_sampler_array::ensure_sampler(std::size_t tile_id, const shared_sampler& x)
+{
+    CORRADE_INTERNAL_ASSERT(tile_id < TILE_COUNT);
+    if (std::size_t id = sampler_map[tile_id]; id != 0)
+    {
+        const shared_sampler& old_sampler = samplers[id];
+        if (x == old_sampler)
+            return;
+    }
+    CORRADE_INTERNAL_ASSERT(samplers.size() < MAX_SAMPLERS);
+    const auto id = (std::uint8_t)samplers.size();
+    samplers.push_back(x);
+    sampler_map[tile_id] = id;
+}
+
+void chunk_sampler_array::clear()
+{
+    Magnum::GL::AbstractTexture::unbindImages(0, samplers.size());
+    samplers.clear();
+    sampler_map = {};
+}
+
+void chunk_sampler_array::bind()
+{
+    Magnum::GL::AbstractTexture::unbindImages(0, MAX_SAMPLERS);
+    for (std::size_t i = 0; i < samplers.size(); i++)
+        samplers[i]->texture().bind((int)i + 1);
+}
+
+std::shared_ptr<tile_atlas> chunk_sampler_array::operator[](std::size_t tile_id) const
+{
+    CORRADE_INTERNAL_ASSERT(tile_id < TILE_COUNT);
+    std::size_t sampler_id = sampler_map[tile_id] - 1;
+    CORRADE_INTERNAL_ASSERT(sampler_id < samplers.size());
+    const auto& sampler = samplers[sampler_id];
+    CORRADE_INTERNAL_ASSERT(sampler != nullptr);
+    return sampler;
+}
+
+} // namespace Magnum::Examples