Implement font rendering, add gold

Makefile

@@ -21,8 +21,8 @@ else
 	LINKER_FLAGS += -fsanitize=address,undefined -g -Og -rdynamic
 endif
 
-CXX_FLAGS += $(shell pkg-config sdl2 SDL2_image --cflags)
-LINKER_FLAGS += $(shell pkg-config sdl2 SDL2_image --libs)
+CXX_FLAGS += $(shell pkg-config sdl2 SDL2_image SDL2_ttf --cflags)
+LINKER_FLAGS += $(shell pkg-config sdl2 SDL2_image SDL2_ttf --libs)
 
 build/%.o: %.cpp $(wildcard *.hpp)
 	@mkdir -p `dirname $@`

src/Color.hpp

@@ -0,0 +1,28 @@
+#ifndef COLOR_HPP
+#define COLOR_HPP
+
+#include <cstdint>
+
+typedef SDL_Color Color;
+
+inline Color rgb(uint8_t red, uint8_t green, uint8_t blue)
+{
+	SDL_Color color;
+	color.r = red;
+	color.g = green;
+	color.b = blue;
+	color.a = 255;
+	return color;
+}
+
+inline Color rgba(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha)
+{
+	SDL_Color color;
+	color.r = red;
+	color.g = green;
+	color.b = blue;
+	color.a = alpha;
+	return color;
+}
+
+#endif

src/Game.cpp

@@ -1,8 +1,10 @@
 #include <thread>
 #include <functional>
+#include <string>
 #include "GameRenderer.hpp"
 #include "Player.hpp"
 #include "Game.hpp"
+#include "Color.hpp"
 
 using namespace std::literals::chrono_literals;
 
@@ -10,6 +12,9 @@ Game::Game() : renderer("Zombo Shooter", 800, 450), player(&renderer), map(&rend
 {
 	arrow_sprite = renderer.load_sprite("./assets/arrow.png", 22, 8);
 	zombo_sprite = renderer.load_sprite("./assets/zombo.png", 40, 40);
+	gold_sprite = renderer.load_sprite("./assets/gold.png", 30, 20);
+
+	font = renderer.load_font("./assets/Jersey20-Regular.ttf", 26);
 }
 
 void Game::update(std::stop_token stop_token)
@@ -53,7 +58,10 @@ void Game::update(std::stop_token stop_token)
 					std::erase(arrows, arrow);
 
 					zombo.hp--;
-					if (zombo.hp == 0) std::erase(zombos, zombo);
+					if (zombo.hp == 0) {
+						std::erase(zombos, zombo);
+						player.gold += 10;
+					}
 				}
 			}
 		}
@@ -76,7 +84,7 @@ void Game::draw()
 {
 	const std::lock_guard lock(game_mutex);
 
-	renderer.clear_screen(0x80, 0x40, 0xFF, 0xFF);
+	renderer.clear_screen(rgb(0x80, 0x40, 0xFF));
 
 	map.draw(player.x, player.y);
 
@@ -90,6 +98,12 @@ void Game::draw()
 
 	player.draw();
 
+	renderer.draw_sprite(*gold_sprite, renderer.screen_width - 50, 10);
+
+	int text_width = renderer.get_text_width(font, std::to_string(player.gold));
+	renderer.draw_text(font, std::to_string(player.gold), renderer.screen_width - gold_sprite->width - text_width - 28, 10, rgb(0, 0, 0));
+	renderer.draw_text(font, std::to_string(player.gold), renderer.screen_width - gold_sprite->width - text_width - 30, 8, rgb(255, 255, 255));
+
 	renderer.flush();
 }
 

src/Game.hpp

@@ -17,7 +17,8 @@ private:
 	Map map;
 	std::vector<Arrow> arrows;
 	std::vector<Zombo> zombos;
-	std::unique_ptr<Sprite> arrow_sprite, zombo_sprite;
+	std::unique_ptr<Sprite> arrow_sprite, zombo_sprite, gold_sprite;
+	Font *font;
 
 	std::mutex game_mutex;
 	unsigned int ticks = 0;

src/GameRenderer.cpp

@@ -1,4 +1,5 @@
-#include <SDL2/SDL_image.h>
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_ttf.h>
 #include <memory>
 #include <iostream>
 #include "Sprite.hpp"
@@ -12,6 +13,11 @@ GameRenderer::GameRenderer(const std::string &title, const int screen_width, con
 		exit(EXIT_FAILURE);
 	}
 
+	if (TTF_Init() < 0) {
+		std::cerr << "Unable to initialize SDL_ttf" << std::endl;
+		exit(EXIT_FAILURE);
+	}
+
 	SDL_SetHint(SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR, "0");
 
 	window = SDL_CreateWindow(
@@ -40,6 +46,26 @@ GameRenderer::~GameRenderer()
 	SDL_DestroyWindow(window);
 }
 
+Font *GameRenderer::load_font(const std::string &file, int font_size)
+{
+	return TTF_OpenFont(file.c_str(), font_size);
+}
+
+int GameRenderer::get_text_width(Font *font, const std::string &text) const
+{
+	SDL_Surface *surface = TTF_RenderText_Solid(font, text.c_str(), rgb(0, 0, 0));
+	return surface->w;
+}
+
+void GameRenderer::draw_text(Font *font, const std::string &text, int x, int y, Color color) const
+{
+	SDL_Surface *surface = TTF_RenderText_Solid(font, text.c_str(), color);
+	SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
+
+	SDL_Rect textRect = { .x = x, .y = y, .w = surface->w, .h = surface->h };
+	SDL_RenderCopy(renderer, texture, nullptr, &textRect);
+}
+
 std::unique_ptr<Sprite> GameRenderer::load_sprite(const std::string &file, const int width, const int height) const
 {
 	return std::make_unique<Sprite>(renderer, file, width, height);
@@ -63,9 +89,9 @@ void GameRenderer::draw_sprite_rotated(const Sprite &sprite, const int x, const
 	SDL_RenderCopyEx(renderer, sprite.texture, nullptr, &rect, angle, nullptr, SDL_FLIP_NONE);
 }
 
-void GameRenderer::clear_screen(const uint8_t r, const uint8_t g, const uint8_t b, const uint8_t a) const
+void GameRenderer::clear_screen(Color color) const
 {
-	SDL_SetRenderDrawColor(renderer, r, g, b, a);
+	SDL_SetRenderDrawColor(renderer, color.r, color.g, color.b, color.a);
 	SDL_RenderClear(renderer);
 }
 

src/GameRenderer.hpp

@@ -4,7 +4,11 @@
 #include <memory>
 #include <string>
 #include <SDL2/SDL.h>
+#include <SDL2/SDL_ttf.h>
 #include "Sprite.hpp"
+#include "Color.hpp"
+
+typedef TTF_Font Font;
 
 class GameRenderer
 {
@@ -22,7 +26,13 @@ public:
 
 	~GameRenderer();
 
-	std::unique_ptr<Sprite> load_sprite(const std::string &file, int width, int height) const;
+	[[nodiscard]] Font *load_font(const std::string &file, int font_size);
+
+	int get_text_width(Font *font, const std::string &text) const;
+
+	void draw_text(Font *font, const std::string &text, int x, int y, Color color) const;
+
+	[[nodiscard]] std::unique_ptr<Sprite> load_sprite(const std::string &file, int width, int height) const;
 
 	void draw_sprite(const Sprite &sprite, int x, int y) const;
 
@@ -30,7 +40,7 @@ public:
 
 	void draw_sprite_rotated(const Sprite &sprite, int x, int y, double angle) const;
 
-	void clear_screen(uint8_t r, uint8_t g, uint8_t b, uint8_t a) const;
+	void clear_screen(Color color) const;
 
 	void flush() const;
 

src/Player.hpp

@@ -21,6 +21,8 @@ public:
 
 	int shooting_cooldown = 0;
 
+	int gold = 0;
+
 	static constexpr double speed = 1.5;
 
 	Player(GameRenderer *renderer);