space-game001/Game.cpp

#include "Game.h"
#include "AnimatedModel.h"
#include "BoneAnimatedModel.h"
#include "Utils.h"
#include "OpenGlExtensions.h"
#include <iostream>
#include "TextureManager.h"
#include "TextModel.h"

namespace ZL
{
    const char* CONST_ZIP_FILE = "";

Game::Game() 
    : window(nullptr)
    , glContext(nullptr)
    , newTickCount(0)
    , lastTickCount(0)
{
}

Game::~Game() {
    if (glContext) {
        SDL_GL_DeleteContext(glContext);
    }
    if (window) {
        SDL_DestroyWindow(window);
    }
    SDL_Quit();
}

void Game::setup() {   
    glContext = SDL_GL_CreateContext(ZL::Environment::window);

    ZL::BindOpenGlFunctions();
    ZL::CheckGlError();

    // Initialize renderer

#ifdef EMSCRIPTEN
    renderer.shaderManager.AddShaderFromFiles("default", "./shaders/default.vertex", "./shaders/default_web.fragment", CONST_ZIP_FILE);
    renderer.shaderManager.AddShaderFromFiles("defaultColor", "./shaders/defaultColor.vertex", "./shaders/defaultColor_web.fragment", CONST_ZIP_FILE);
#else
    renderer.shaderManager.AddShaderFromFiles("default", "./shaders/default.vertex", "./shaders/default_desktop.fragment", CONST_ZIP_FILE);
    renderer.shaderManager.AddShaderFromFiles("defaultColor", "./shaders/defaultColor.vertex", "./shaders/defaultColor_desktop.fragment", CONST_ZIP_FILE);
#endif

    //Load texture
    spaceshipTexture = std::make_unique<Texture>(CreateTextureDataFromPng("./resources/sship001x.png"));
    spaceshipBase = LoadFromTextFile02("./resources/spaceship004.txt");
    spaceshipBase.RotateByMatrix(QuatToMatrix(QuatFromRotateAroundY(M_PI / 2.0)));
    spaceship.AssignFrom(spaceshipBase);
    spaceship.RefreshVBO();


    renderer.InitOpenGL();
    
}

void Game::drawScene() {
    static const std::string defaultShaderName = "default";
    static const std::string vPositionName = "vPosition";
    static const std::string vTexCoordName = "vTexCoord";
    static const std::string textureUniformName = "Texture";

    glClearColor(0.0f, 0.5f, 1.0f, 1.0f);
    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

    glViewport(0, 0, Environment::width, Environment::height);

    CheckGlError();

    renderer.shaderManager.PushShader(defaultShaderName);
    renderer.RenderUniform1i(textureUniformName, 0);
    renderer.EnableVertexAttribArray(vPositionName);
    renderer.EnableVertexAttribArray(vTexCoordName);

    renderer.PushPerspectiveProjectionMatrix(1.0 / 1.5,
        static_cast<float>(Environment::width) / static_cast<float>(Environment::height),
        1, 1000);
    renderer.PushMatrix();

    renderer.LoadIdentity();
    renderer.TranslateMatrix({ 0,0, -1.0f*Environment::zoom });
    renderer.RotateMatrix(QuatFromRotateAroundX(M_PI/6.0));
    //renderer.RotateMatrix(QuatFromRotateAroundX(Environment::cameraAlpha));

    glBindTexture(GL_TEXTURE_2D, spaceshipTexture->getTexID());
    renderer.DrawVertexRenderStruct(spaceship);

    renderer.PopMatrix();
    renderer.PopProjectionMatrix();
    renderer.DisableVertexAttribArray(vPositionName);
    renderer.DisableVertexAttribArray(vTexCoordName);

    renderer.shaderManager.PopShader();

    CheckGlError();
}

void Game::processTickCount() {

    if (lastTickCount == 0) {
        lastTickCount = SDL_GetTicks64();
        return;
    }
    
    newTickCount = SDL_GetTicks64();
    if (newTickCount - lastTickCount > CONST_TIMER_INTERVAL) {
        size_t delta = (newTickCount - lastTickCount > CONST_MAX_TIME_INTERVAL) ? 
            CONST_MAX_TIME_INTERVAL : newTickCount - lastTickCount;
        
        //gameObjects.updateScene(delta);

        Environment::cameraAlpha = Environment::cameraAlpha + delta * M_PI / 10000.f;
        
        lastTickCount = newTickCount;
    }
}

void Game::render() {
    SDL_GL_MakeCurrent(ZL::Environment::window, glContext);
    ZL::CheckGlError();

    glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    drawScene();
    processTickCount();

    SDL_GL_SwapWindow(ZL::Environment::window);
}

void Game::update() {
    SDL_Event event;
    while (SDL_PollEvent(&event)) {
        if (event.type == SDL_QUIT) {
            Environment::exitGameLoop = true;
            
        }
        else if (event.type == SDL_MOUSEWHEEL) {
            static const float zoomstep = 2.0f;
            if (event.wheel.y > 0) {
                Environment::zoom -= zoomstep;
            }
            else if (event.wheel.y < 0) {
                Environment::zoom += zoomstep;
            }
            if (Environment::zoom < zoomstep) {
                Environment::zoom = zoomstep;
            }
            /*if (Environment::zoom > 4) {
                Environment::zoom = 4;
            }*/

            //this->modelMeshRender.data.Scale(0.5);
            //this->modelMeshRender.RefreshVBO();
        }

        
    }
    render();
}

}  // namespace ZL