95 lines
3 KiB
Text
95 lines
3 KiB
Text
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module;
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#include <cassert>
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#include <string>
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#include <utility>
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#include <vector>
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export module core.drawing.tile_set;
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import core.render_server;
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import wrappers.sdl;
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export namespace core
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{
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using TileSetID = unsigned int;
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using TileID = unsigned int;
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struct TileDefinition
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{
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sdl::FRect atlas_src_rect;
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};
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class TileSet
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{
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// Texture ID of tileset atlas texture
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TextureID texture_id_;
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// Size of each tile in pixels
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// TODO: Do we need this?
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// int tile_size_;
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// Tile definitions: Maps tile ID to a struct describing the tile, e.g. the texture source boundaries,
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// collision data, etc.
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std::vector<TileDefinition> tile_definitions_;
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public:
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TileSet() = delete;
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explicit TileSet(
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const TextureID texture_id,
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std::vector<TileDefinition> tile_definitions
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)
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: texture_id_{texture_id},
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tile_definitions_{std::move(tile_definitions)}
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{}
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static TileSet create_from_texture(
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RenderServer& render_server,
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const std::string& filename,
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const int tile_size,
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const std::vector<sdl::Point>& tile_atlas_coords
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)
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{
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const TextureID texture_id = render_server.load_texture(filename);
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const sdl::Texture& texture = render_server.get_texture(texture_id);
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assert(tile_size > 0);
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// TODO: These probably shouldn't be asserts...
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assert(texture.get_width() % tile_size == 0);
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assert(texture.get_height() % tile_size == 0);
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std::vector<TileDefinition> tile_definitions;
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// TODO: Should we automatically create tile 0 (no tile) instead of listing it in tile_atlas_coords?
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for (const auto& [x, y] : tile_atlas_coords) {
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const TileDefinition tile{
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{
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static_cast<float>(x * tile_size),
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static_cast<float>(y * tile_size),
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static_cast<float>(tile_size),
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static_cast<float>(tile_size),
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}
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};
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// TODO: These probably shouldn't be asserts...
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assert(tile.atlas_src_rect.x + tile.atlas_src_rect.w <= texture.get_width());
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assert(tile.atlas_src_rect.y + tile.atlas_src_rect.h <= texture.get_height());
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tile_definitions.push_back(tile);
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}
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return TileSet(texture_id, tile_definitions);
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}
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constexpr TextureID get_texture_id() const
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{
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return texture_id_;
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}
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constexpr const TileDefinition& get_tile_definition(const TileID tile_id) const
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{
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return tile_definitions_.at(tile_id);
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}
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};
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}
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