Implemented void load_interface_textures

src/inc/texture.hpp

@@ -142,4 +142,79 @@ struct complete_texture
 
 	unsigned char* pixels;
 };
+
+// Load the interface textures into a std::map mapping the interface texture's
+// name to it's complete_texture*.
+
+std::map<std::string, complete_texture*> interface_textures;
+
+void load_interface_textures()
+{
+	for (int i = 0; i < all_gui.size(); i++)
+	{
+		// Load the texture.
+
+		std::string path = "../gui/" + all_gui[i] + ".png";
+
+		GLuint gui_texture;
+
+		glGenTextures(1, &gui_texture);
+
+		glBindTexture(GL_TEXTURE_2D, gui_texture);
+
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);	
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+		int gui_x_res;
+		int gui_y_res;
+
+		int gui_channels;
+
+		unsigned char* gui_data = stbi_load(path.c_str(), &gui_x_res, &gui_y_res, &gui_channels, 0);
+
+		if (!gui_data)
+		{
+			std::cout << "Could not load \"" << path << "\" using stbi_load." << std::endl;
+
+			exit(18);
+		}
+
+		if (gui_channels != 4 && gui_channels != 3)
+		{
+			std::cout << "Channel count of \"" << path << "\" (" << gui_channels << ") does not match any of the expected channel counts (3 or 4)." << std::endl;
+
+			exit(19); 
+		}
+
+		if (gui_channels == 4)
+		{
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, gui_x_res, gui_y_res, 0, GL_RGBA, GL_UNSIGNED_BYTE, gui_data);
+		}
+		else
+		{
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, gui_x_res, gui_y_res, 0, GL_RGB, GL_UNSIGNED_BYTE, gui_data);
+		}
+
+		glBindTexture(GL_TEXTURE_2D, 0);
+
+		// Generate a complete_texture* to store in interface_textures.
+
+		complete_texture* gui_complete = new complete_texture();
+
+		gui_complete->storage = gui_texture;
+
+		gui_complete->x_res = gui_x_res;
+		gui_complete->y_res = gui_y_res;
+
+		gui_complete->channels = gui_channels;
+
+		gui_complete->pixels = gui_data;
+
+		// Add the complete_texture entry to interface_textures.
+
+		interface_textures.emplace(all_gui[i], gui_complete);
+	}
 }