Basic Chunk

1 files changed, 72 insertions, 0 deletions

diff --git a/src/World/Chunk.cpp b/src/World/Chunk.cpp
new file mode 100644
index 0000000..73aab3d
--- /dev/null
+++ b/src/World/Chunk.cpp
@@ -0,0 +1,72 @@
+#include "Chunk.hpp"
+#include "BlockSide.hpp"
+
+namespace MC {
+
+void Chunk::set(uint32_t x, uint32_t y, uint32_t z, BlockType type) {
+    m_blocks[x][y][z].type = type;
+}
+
+Mesh Chunk::mesh() {
+    std::vector<Vector<3>> positions{};
+    std::vector<Vector<2>> tex_coords{};
+    std::vector<uint32_t> 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 type = m_blocks[x][y][z].type;
+                if (type == BlockType::Air) {
+                    continue;
+                }
+
+                for (auto side: BlockSide::all()) {
+                    auto side_tex_coords = Chunk::face_tex_coords(type, side);
+                    auto side_positions = side.face();
+
+                    for (auto& position : side_positions) {
+                        position = position + Vector<3>{static_cast<float>(x), static_cast<float>(y), static_cast<float>(z)};
+                    }
+
+                    uint32_t s = positions.size();
+
+                    positions.insert(positions.end(), side_positions.begin(), side_positions.end());
+                    tex_coords.insert(tex_coords.end(), side_tex_coords.begin(), side_tex_coords.end());
+                    indices.insert(indices.end(), {s, s + 1, s + 3, s + 1, s + 2, s + 3});
+                }
+            }
+        }
+    }
+
+    return {positions, tex_coords, indices};
+}
+
+std::array<Vector<2>, 4> Chunk::face_tex_coords(BlockType type, BlockSide side) {
+    switch (type) {
+        case BlockType::Dirt:
+            return {{
+                {0.5f, 0.0f}, {1.0f, 0.0f}, {1.0f, 0.5f}, {0.5f, 0.5f},
+            }};
+        case BlockType::Grass:
+            switch (side) {
+                case BlockSide::Front:
+                case BlockSide::Back:
+                case BlockSide::Left:
+                case BlockSide::Right:
+                    return {{
+                        {0.5f, 1.0f}, {0.0f, 1.0f},  {0.0f, 0.5f}, {0.5f, 0.5f},
+                    }};
+                case BlockSide::Top:
+                    return {{
+                        {0.0f, 0.0f}, {0.5f, 0.0f}, {0.5f, 0.5f}, {0.0f, 0.5f},
+                    }};
+                case BlockSide::Bottom:
+                    return {{
+                        {0.5f, 0.0f}, {1.0f, 0.0f}, {1.0f, 0.5f}, {0.5f, 0.5f},
+                    }};
+            }
+        default:
+            return {};
+    }}
+
+}