Assets loading refactor

src/assets/asset_loaders.cpp

@@ -0,0 +1,80 @@
+#include "asset_loaders.h"
+
+#include <iostream>
+#include "Assets.h"
+#include "../coders/png.h"
+#include "../graphics/Shader.h"
+#include "../graphics/Texture.h"
+#include "../graphics/ImageData.h"
+#include "../graphics/Atlas.h"
+#include "../graphics/Font.h"
+
+using std::string;
+using std::vector;
+using std::unique_ptr;
+using std::filesystem::path;
+
+namespace fs = std::filesystem;
+
+bool assetload::texture(Assets* assets, 
+                        const path& filename, 
+                        const string& name) {
+	Texture* texture = png::load_texture(filename.string());
+	if (texture == nullptr) {
+		std::cerr << "failed to load texture '" << name << "'" << std::endl;
+		return false;
+	}
+	assets->store(texture, name);
+	return true;
+}
+
+bool assetload::shader(Assets* assets, 
+                        const path& filename, 
+                        const string& name) {
+	Shader* shader = Shader::loadShader(filename.string() + ".glslv", 
+                                        filename.string() + ".glslf");
+	if (shader == nullptr) {
+		std::cerr << "failed to load shader '" << name << "'" << std::endl;
+		return false;
+	}
+	assets->store(shader, name);
+	return true;
+}
+
+bool assetload::atlas(Assets* assets, 
+                        const path& directory, 
+                        const string& name) {
+	AtlasBuilder builder;
+	for (const auto& entry : fs::directory_iterator(directory)) {
+		path file = entry.path();
+		if (file.extension() == ".png") {
+			string name = file.stem().string();
+			std::unique_ptr<ImageData> image (png::load_image(file.string()));
+			image->fixAlphaColor();
+			builder.add(name, image.release());
+		}
+	}
+	Atlas* atlas = builder.build(2);
+	assets->store(atlas, name);
+	return true;
+}
+
+bool assetload::font(Assets* assets, 
+                        const path& filename, 
+                        const string& name) {
+	vector<Texture*> pages;
+	for (size_t i = 0; i <= 4; i++) {
+        string name = filename.string() + "_" + std::to_string(i) + ".png";
+		Texture* texture = png::load_texture(name);
+		if (texture == nullptr) {
+			std::cerr << "failed to load bitmap font '" << name;
+            std::cerr << "' (missing page " << std::to_string(i) << ")";
+            std::cerr << std::endl;
+			return false;
+		}
+		pages.push_back(texture);
+	}
+	Font* font = new Font(pages, pages[0]->height / 16);
+	assets->store(font, name);
+	return true;
+}