Merge pull request 'Flappy bird' (#3) from robin_rottstaedt/paradiso:main into main

Reviewed-on: #3

Pull request needs revised naming for the example but seems good to go and inlined. Thanks

examples/CMakeLists.txt

@@ -1,2 +1,3 @@
 add_subdirectory(simple)
-add_subdirectory(pong)
+add_subdirectory(pong)
+add_subdirectory(flappy_bird)

examples/flappy_bird/CMakeLists.txt

@@ -0,0 +1,11 @@
+file(GLOB_RECURSE flappy_bird_src "*.cpp")
+file(GLOB_RECURSE flappy_bird_lib "lib/*.hpp" "lib/*.h")
+file(GLOB_RECURSE flappy_bird_assets "assets/*")
+
+add_executable(flappy_bird ${flappy_bird_src} ${flappy_bird_lib})
+target_link_libraries(flappy_bird paradiso_core)
+
+add_custom_command(TARGET flappy_bird POST_BUILD
+                   COMMAND ${CMAKE_COMMAND} -E copy_directory
+                       ${CMAKE_CURRENT_SOURCE_DIR}/assets/ $<TARGET_FILE_DIR:flappy_bird>/assets)
+                

examples/flappy_bird/flappy_bird.cpp

@@ -0,0 +1,310 @@
+/**
+ * paradiso - Paradigmen der Softwareentwicklung
+ *
+ * (c) Copyright 2023 Hartmut Seichter
+ *
+ */
+
+#include <paradiso/bitmap.hpp>
+#include <paradiso/context.hpp>
+#include <paradiso/geometry.hpp>
+#include <paradiso/renderer.hpp>
+#include <paradiso/shader.hpp>
+#include <paradiso/sprite.hpp>
+#include <paradiso/vector.hpp>
+#include <paradiso/window.hpp>
+
+#include <chrono>
+#include <iomanip>
+#include <iostream>
+#include <unordered_map>
+
+#include "lib/image_loader.hpp"
+
+const int frame_rate = 60;
+
+struct Background {
+    paradiso::Sprite backgroundLeft;
+    paradiso::Sprite backgroundRight;
+    paradiso::Sprite grassLeft;
+    paradiso::Sprite grassRight;
+
+    paradiso::Sprite* scrolling[2] = {&backgroundLeft, &backgroundRight};
+
+    Background() {
+        auto backgroundImage =
+            image_loader::load(std::string("background-day.png"));
+        backgroundLeft = paradiso::Sprite{
+            .bitmap = backgroundImage,
+            .pivot = paradiso::Vector2<float>::make(0.0f, 0.0f),
+            .scale = paradiso::Vector2<float>::make(1.01f, 1.0f)};
+        backgroundRight = paradiso::Sprite{
+            .bitmap = backgroundImage,
+            .pivot = paradiso::Vector2<float>::make(2.0f, 0.0f),
+            .scale = paradiso::Vector2<float>::make(1.01f, 1.0f)};
+
+        auto grassImage = image_loader::load(std::string("base.png"));
+        grassLeft = paradiso::Sprite{
+            .bitmap = grassImage,
+            .pivot = paradiso::Vector2<float>::make(0.0f, -1.0f),
+            .scale = paradiso::Vector2<float>::make(1.0f, 0.33333f)};
+        grassRight = paradiso::Sprite{
+            .bitmap = grassImage,
+            .pivot = paradiso::Vector2<float>::make(2.0f, -1.0f),
+            .scale = paradiso::Vector2<float>::make(1.0f, 0.33333f)};
+    }
+
+    void draw(const paradiso::Shader& shader) {
+        for (auto sprite : scrolling) {
+            if (sprite->pivot.x() <= -2.0f) {
+                sprite->pivot.x() += 4.0f;
+            }
+            sprite->pivot.x() -= 0.001f;
+            shader.set_uniform("pivot", sprite->pivot);
+            shader.set_uniform("scale", sprite->scale);
+            shader.set_uniform("rotation", sprite->rotation);
+            renderer.draw(*sprite, shader);
+        }
+    }
+
+    paradiso::Renderer renderer{};
+};
+
+struct Grass {
+    paradiso::Sprite grassLeft;
+    paradiso::Sprite grassRight;
+
+    paradiso::Sprite* scrolling[2] = {&grassLeft, &grassRight};
+
+    Grass() {
+        auto grassImage = image_loader::load(std::string("base.png"));
+        grassLeft = paradiso::Sprite{
+            .bitmap = grassImage,
+            .pivot = paradiso::Vector2<float>::make(0.0f, -0.9f),
+            .scale = paradiso::Vector2<float>::make(1.0f, 0.33333f)};
+        grassRight = paradiso::Sprite{
+            .bitmap = grassImage,
+            .pivot = paradiso::Vector2<float>::make(2.0f, -0.9f),
+            .scale = paradiso::Vector2<float>::make(1.0f, 0.33333f)};
+    }
+
+    void draw(const paradiso::Shader& shader) {
+        for (auto sprite : scrolling) {
+            if (sprite->pivot.x() <= -2.0f) {
+                sprite->pivot.x() += 4.0f;
+            }
+            sprite->pivot.x() -= 0.035f;
+            shader.set_uniform("pivot", sprite->pivot);
+            shader.set_uniform("scale", sprite->scale);
+            shader.set_uniform("rotation", sprite->rotation);
+            renderer.draw(*sprite, shader);
+        }
+    }
+
+    paradiso::Renderer renderer{};
+};
+
+struct FlappyBird {
+
+    paradiso::Renderer renderer1{};
+    paradiso::Renderer renderer2{};
+    paradiso::Renderer renderer3{};
+
+    std::array<paradiso::Sprite, 3> birds;
+    unsigned int flap = 0;
+    unsigned int flapSpeed = 15;  // How many ticks per flap
+    unsigned int flapCounter = 0; // How many ticks since last flap
+
+    float velocity = 0.0f;
+    const float max_velocity = 0.05f;
+
+    const float gravity = -0.004f;
+    const float move_up_velocity = 0.0055f;
+
+    bool move_up = false;
+    bool paused = true;
+
+    const float max_pos = 0.95f;
+    const float min_pos = -0.5f;
+
+    float pos = 0.0f;
+
+    float rotation = 0.0f;
+
+    FlappyBird() {
+        float scaleh = 0.07f;
+        float scalew = scaleh * 1.416666666666667f;
+
+        birds = {
+            paradiso::Sprite{
+                .bitmap =
+                    image_loader::load(std::string("yellowbird-downflap.png")),
+                .pivot = paradiso::Vector2<float>::make(0.0f, 0.0f),
+                .scale = paradiso::Vector2<float>::make(scalew, scaleh)},
+            paradiso::Sprite{
+                .bitmap =
+                    image_loader::load(std::string("yellowbird-midflap.png")),
+                .pivot = paradiso::Vector2<float>::make(0.0f, 0.0f),
+                .scale = paradiso::Vector2<float>::make(scalew, scaleh)},
+            paradiso::Sprite{
+                .bitmap =
+                    image_loader::load(std::string("yellowbird-upflap.png")),
+                .pivot = paradiso::Vector2<float>::make(0.0f, 0.0f),
+                .scale = paradiso::Vector2<float>::make(scalew, scaleh)}};
+    }
+
+    void draw(const paradiso::Shader& shader) {
+        // Update flap state
+        if (flapCounter < flapSpeed) {
+            flapCounter++;
+        } else {
+            flapCounter = 0;
+            flap = (flap + 1) % birds.size();
+        }
+
+        auto bird = birds[flap];
+        bird.pivot.y() = pos;
+        bird.rotation = rotation;
+        shader.set_uniform("pivot", bird.pivot);
+        shader.set_uniform("scale", bird.scale);
+        shader.set_uniform("rotation", bird.rotation);
+
+        switch (flap) {
+        case 0:
+            renderer1.draw(bird, shader);
+            break;
+        case 1:
+            renderer2.draw(bird, shader);
+            break;
+        case 2:
+            renderer3.draw(bird, shader);
+            break;
+        }
+    }
+
+    void update() {
+        // Stop game
+        if (paused)
+            return;
+
+        // Apply gravity
+        velocity += gravity;
+
+        if (move_up)
+            velocity += move_up_velocity - gravity;
+
+        // Cap velocity
+        if (velocity > max_velocity)
+            velocity = max_velocity;
+        if (velocity < -max_velocity)
+            velocity = -max_velocity;
+
+        // Cap position
+        pos += velocity;
+        if (pos < min_pos) {
+            pos = min_pos;
+            velocity = 0.0f;
+        }
+        if (pos > max_pos) {
+            pos = max_pos;
+            velocity = 0.0f;
+        }
+
+        // Update rotation
+        rotation = velocity * 15.0f;
+    }
+
+    // keyboard handler
+    void on_keyboard(const paradiso::Window::KeyboardInputStack& input) {
+        if (input.size()) {
+            paused = false;
+            bool pressed_up = input.top().key == ' ' || input.top().key == 'W';
+
+            if (input.top().action == 1 && pressed_up) {
+                move_up = true;
+            } else if (input.top().action == 0 && pressed_up) {
+                move_up = false;
+            }
+        }
+    }
+};
+
+auto main() -> int {
+
+    // Ausgabefenster ... sieht aus als wäre es auf dem Stack
+    auto window = paradiso::Window();
+
+    auto size = paradiso::Size{.width = 500, .height = 700};
+
+    /*
+    window.set_resizecallback([](auto& w) -> void {
+        w.set_size(paradiso::Size{.width = 405, .height = 720});
+    });
+
+*/
+    window
+        .set_size(size)                                    // ... Grösse
+        .set_position(paradiso::Point{.x = 100, .y = 100}) // ... Position
+        .set_title("PardiSO.FlappyBird")                   // ... Titel
+        .set_visible(true); // ... und jetzt anzeigen!
+
+    // der Fenster Kontext
+    auto ctx = paradiso::Context{};
+
+    // ein Shader (Schattierungsprogramm)
+    auto shader = paradiso::Shader{};
+
+    // wir nutzen einen vorgefertigten shader
+    shader.load_preset(paradiso::Shader::Preset::Sprite);
+
+    // ein viewport stellt die Sicht der Kamera dar, d.h. bei quadratischen
+    // Pixeln sollte hier auch eine dementsprechende Grösse eingestellt
+    // werden
+    ctx.set_viewport(paradiso::Rectangle{
+        .position = paradiso::Point{.x = 0, .y = 0}, .size = size});
+
+    // nothing beats a classic look
+    ctx.set_clearcolor(paradiso::RGBA::from_rgb(0x00, 0x00, 0x00));
+
+    // Load
+    auto background = Background{};
+    auto grass = Grass{};
+
+    auto flappyBird = FlappyBird{};
+
+    // timer
+
+    // das update führt den hier mitgegebnen Ausdruck innerhalb der internen
+    // Updates des Fensters auf. Es wird hier auch explizit ein bool gefordert
+    // damit das update auch zu jederzeit unterbrochen werden kann
+    while (window.update([&](paradiso::Window& w) -> bool {
+        ctx.set_viewport(paradiso::Rectangle{
+            .position = paradiso::Point{.x = 0, .y = 0}, .size = size});
+
+        ctx.clear();
+        auto t1 = std::chrono::high_resolution_clock::now();
+
+        // Keyboard and state change
+        flappyBird.on_keyboard(w.keyboard_input());
+        flappyBird.update();
+
+        // Draw
+        background.draw(shader);
+        grass.draw(shader);
+        flappyBird.draw(shader);
+
+        // wait for frame rate
+        auto t2 = std::chrono::high_resolution_clock::now();
+        auto duration =
+            std::chrono::duration_cast<std::chrono::microseconds>(t2 - t1);
+        auto wait = std::chrono::microseconds(1000000 / frame_rate) - duration;
+        std::this_thread::sleep_for(wait);
+
+        // Quit
+        return !(w.keyboard_input().size() &&
+                 w.keyboard_input().top().key == 'Q');
+    })) {
+    };
+
+    return 0;
+}

examples/flappy_bird/image_loader.cpp

@@ -0,0 +1,72 @@
+#include <paradiso/rgba.hpp>
+#include <paradiso/sprite.hpp>
+
+#include <fstream>
+#include <iostream>
+#include <optional>
+#include <unordered_map>
+
+// STB image loading
+#define STB_IMAGE_IMPLEMENTATION
+#include "lib/stb_image.h"
+
+#include "lib/image_loader.hpp"
+
+std::unordered_map<std::string, paradiso::Bitmap> image_loader::image_cache =
+    std::unordered_map<std::string, paradiso::Bitmap>();
+
+paradiso::Bitmap image_loader::load(const std::string& filename) {
+    if (image_cache.find(filename) == image_cache.end()) {
+        std::string path = ASSET_PATH + filename;
+        std::cout << "Loading " << path << std::endl;
+        auto data = readBMP(path);
+        image_cache[filename] = data;
+    }
+    return image_cache[filename];
+}
+
+paradiso::Bitmap image_loader::readBMP(std::string& filename) {
+    // Load with stb_image
+    stbi_set_flip_vertically_on_load(true); // flip y axis for OpenGL
+    int width, height, channels;
+    unsigned char* image =
+        stbi_load(filename.c_str(), &width, &height, &channels, 4);
+    int size = width * height;
+
+    if (!image)
+        throw std::runtime_error("Error loading image");
+
+    // Convert to Vector of RGBA
+    std::vector<paradiso::RGBA> rgba = std::vector<paradiso::RGBA>(size);
+    for (int i = 0; i < size; i++) {
+        // get rgba values
+        int pos = i * 4;
+        int r = image[pos + 0];
+        int g = image[pos + 1];
+        int b = image[pos + 2];
+        int a = image[pos + 3];
+
+        // bug in from_rgba. it expects bgra, not rgba
+        auto val = paradiso::RGBA::from_rgba(b, g, r, a);
+        rgba[i] = val;
+    }
+
+    // rotate image by 90 degrees CW
+    std::vector<paradiso::RGBA> rotated = std::vector<paradiso::RGBA>(size);
+    for (int x = 0; x < width; x++) {
+        for (int y = 0; y < height; y++) {
+
+            int pos = y * width + x;
+            int pos_rotated = x * height + (height - y - 1);
+            rotated[pos_rotated] = rgba[pos];
+        }
+    }
+
+    // free image
+    stbi_image_free(image);
+
+    return paradiso::Bitmap::from_data(
+        paradiso::Size{static_cast<unsigned int>(height),
+                       static_cast<unsigned int>(width)},
+        rotated);
+}

examples/flappy_bird/lib/image_loader.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <paradiso/bitmap.hpp>
+
+#include <optional>
+#include <string>
+#include <unordered_map>
+
+class image_loader {
+  public:
+    /**
+     * @brief loads an Image from a file
+     * @param[in] filename path to file
+     * @return bitmap from file
+     */
+    static paradiso::Bitmap load(const std::string& filename);
+
+  private:
+    static inline const std::string ASSET_PATH = "assets/";
+
+    static std::unordered_map<std::string, paradiso::Bitmap> image_cache;
+
+    static paradiso::Bitmap readBMP(std::string& filename);
+};

src/lib/include/paradiso/bitmap.hpp

@@ -54,6 +54,17 @@ struct Bitmap final {
         return {.size = size, .data = {values...}};
     }
 
+    /**
+     * @brief creates a bitmap from RGBA Values
+     * @param[in] size extent of bitmap
+     * @param[in] data vector of RGBA values
+     * @return bitmap with data from this call
+     */
+    static constexpr Bitmap from_data(Size size, std::vector<RGBA> data) noexcept {
+        assert(data.size() == size.height * size.width);
+        return {.size = size, .data = data};
+    }
+
     /**
      * @brief fills a bitmap uniformly
      * @param[in] color RGBA value of a color
@@ -87,10 +98,7 @@ struct Bitmap final {
         return data[y * size.width + x];
     }
 
-    constexpr void force_change() noexcept
-    {
-        change_count++;
-    } 
+    constexpr void force_change() noexcept { change_count++; }
 
     Size size{.width = 0, .height = 0}; //!< extent of bitmap
     std::vector<RGBA> data{};           //!< data storage