[glutils,nostalgia,studio] Fix Xcode build errors

src/nostalgia/core/opengl/gfx.cpp

@@ -154,7 +154,14 @@ static void initBackgroundBufferObjects(Context *ctx, glutils::BufferSet *bg) no
 			const auto i = bgVertexRow(x, y);
 			auto vbo = &bg->vertices[i * static_cast<std::size_t>(BgVertexVboLength)];
 			auto ebo = &bg->elements[i * static_cast<std::size_t>(BgVertexEboLength)];
-			setTileBufferObject(ctx, i * BgVertexVboRows, static_cast<float>(x), static_cast<float>(y), 0, vbo, ebo);
+			setTileBufferObject(
+				ctx,
+				static_cast<unsigned>(i * BgVertexVboRows),
+				static_cast<float>(x),
+				static_cast<float>(y),
+				0,
+				vbo,
+				ebo);
 		}
 	}
 }
@@ -437,7 +444,7 @@ void setBgStatus(Context *ctx, unsigned bg, bool status) noexcept {
 }
 
 
-void clearTileLayer(Context *ctx, unsigned bgIdx) noexcept {
+void glearTileLayer(Context *ctx, unsigned bgIdx) noexcept {
 	auto &gctx = static_cast<GlContext&>(*ctx);
 	auto &bg = gctx.cbbs[static_cast<std::size_t>(bgIdx)];
 	initBackgroundBufferObjects(&gctx, &bg);
@@ -526,9 +533,13 @@ void setTile(Context *ctx, unsigned bgIdx, int column, int row, uint8_t tile) no
 	auto vbo = &bg.vertices[i * renderer::BgVertexVboLength];
 	auto ebo = &bg.elements[i * renderer::BgVertexEboLength];
 	renderer::setTileBufferObject(
-			ctx, i * renderer::BgVertexVboRows,
-			static_cast<float>(x), static_cast<float>(y),
-			tile, vbo, ebo);
+			ctx,
+			static_cast<unsigned>(i * renderer::BgVertexVboRows),
+			static_cast<float>(x),
+			static_cast<float>(y),
+			tile,
+			vbo,
+			ebo);
 	bg.updated = true;
 }