[nostalgia] Add implementation of single tile sprites on OpenGL

src/nostalgia/core/gfx.hpp

@@ -120,7 +120,7 @@ struct TileSheet {
 		}
 
 		[[nodiscard]]
-		auto idx(const geo::Point &pt) const noexcept {
+		constexpr auto idx(const geo::Point &pt) const noexcept {
 			return ptToIdx(pt, columns);
 		}
 
@@ -275,6 +275,7 @@ struct TileSheet {
 		 * @param pBpp bits per pixel, need for knowing how to count the pixels
 		 * @return a count of the pixels in this sheet
 		 */
+		[[nodiscard]]
 		constexpr auto pixelCnt(int8_t pBpp) const noexcept {
 			return pBpp == 4 ? pixels.size() * 2 : pixels.size();
 		}
@@ -287,13 +288,9 @@ struct TileSheet {
 	SubSheet subsheet{"Root", 1, 1, bpp};
 
 	constexpr TileSheet() noexcept = default;
-	inline TileSheet(const TileSheet &other) noexcept:
-		bpp(other.bpp),
-		defaultPalette(other.defaultPalette),
-		subsheet(other.subsheet) {
-	}
+	TileSheet(const TileSheet &other) noexcept = default;
 	inline TileSheet(TileSheet &&other) noexcept:
-		bpp(std::move(other.bpp)),
+		bpp(other.bpp),
 		defaultPalette(std::move(other.defaultPalette)),
 		subsheet(std::move(other.subsheet)) {
 	}
@@ -468,14 +465,24 @@ oxModelEnd()
 
 struct Sprite {
 	unsigned idx = 0;
-	unsigned x = 0;
-	unsigned y = 0;
+	int x = 0;
+	int y = 0;
 	unsigned tileIdx = 0;
 	unsigned spriteShape = 0;
 	unsigned spriteSize = 0;
 	unsigned flipX = 0;
 };
 
+oxModelBegin(Sprite)
+	oxModelField(idx)
+	oxModelField(x)
+	oxModelField(y)
+	oxModelField(tileIdx)
+	oxModelField(spriteShape)
+	oxModelField(spriteSize)
+	oxModelField(flipX)
+oxModelEnd()
+
 ox::Error initGfx(Context *ctx) noexcept;
 
 void addCustomDrawer(Context *ctx, Drawer *cd) noexcept;
@@ -526,7 +533,7 @@ void clearTileLayer(Context *ctx, unsigned bgIdx) noexcept;
 
 void hideSprite(Context *ctx, unsigned) noexcept;
 
-void setSprite(Context *ctx, unsigned idx, unsigned x, unsigned y, unsigned tileIdx,
+void setSprite(Context *ctx, unsigned idx, int x, int y, unsigned tileIdx,
                unsigned spriteShape = 0, unsigned spriteSize = 0, unsigned flipX = 0) noexcept;
 
 void setSprite(Context *ctx, const Sprite &s) noexcept;