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#include "game.hpp"
#include <yage/sprite.hpp>
#include <stdexcept>
#include <iostream>
Game::Game()
{}
Game::~Game()
{
SDL_DestroyWindow(window_);
SDL_Quit();
}
void Game::initSystems()
{
if(SDL_Init(SDL_INIT_VIDEO))
throw std::runtime_error("SDL_Init failed");
initShaders();
}
void Game::initShaders()
{
program_.compileShaders("res/shaders/color_shading.vert", "res/shaders/color_shading.frag");
program_.addAttribute("vertex_position");
program_.addAttribute("vertex_color");
program_.addAttribute("vertex_uv");
program_.linkShaders();
}
void Game::processInput()
{
SDL_Event event;
while(SDL_PollEvent(&event))
{
switch(event.type)
{
case SDL_QUIT:
game_state_ = GameState::EXIT;
}
}
}
void Game::gameLoop()
{
while(game_state_ != GameState::EXIT)
{
processInput();
drawGame();
time_ += 0.05;
// std::cout<<calculateFps()<<'\n';
}
}
void Game::drawGame()
{
glClearDepth(1.0);
// clears buffer with clear color
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
program_.use();
glActiveTexture(GL_TEXTURE0);
GLint texture_location = program_.getUniformLocation("texture_sampler");
glUniform1i(texture_location, 0);
GLint time_location = program_.getUniformLocation("time");
glUniform1f(time_location, time_);
for(auto sprite : sprites_)
sprite->draw();
glBindTexture(GL_TEXTURE_2D, 0);
program_.unuse();
// swap buffer and draw everything to the screen
SDL_GL_SwapWindow(window_);
}
void Game::run()
{
initSystems();
sprites_.push_back(std::make_shared<Sprite>());
sprites_.back()->init(-1.f, -1.f, 1.f, 1.f, "res/platformer_png/Player/p1_stand.png");
sprites_.push_back(std::make_shared<Sprite>());
sprites_.back()->init(0.f, -1.f, 1.f, 1.f, "res/platformer_png/Player/p1_jump.png");
sprites_.push_back(std::make_shared<Sprite>());
sprites_.back()->init(0.f, 0.f, 1.f, 1.f, "res/platformer_png/Player/p1_hurt.png");
sprites_.push_back(std::make_shared<Sprite>());
sprites_.back()->init(-1.f, 0.f, 1.f, 1.f, "res/platformer_png/Player/p1_duck.png");
gameLoop();
}
float Game::calculateFps()
{
static const int NUM_SAMPLES = 100;
static float frame_times[NUM_SAMPLES];
static float prev_ticks = SDL_GetTicks();
static unsigned current_frame = 0;
float current_ticks = SDL_GetTicks();
frame_times[current_frame%NUM_SAMPLES] = current_ticks-prev_ticks;
prev_ticks = current_ticks;
int count = NUM_SAMPLES;
if(current_frame<NUM_SAMPLES)
count = current_frame;
float frame_time_average = 0;
for(int i = 0; i < count; ++i)
frame_time_average += frame_times[i];
frame_time_average /= count;
float fps = 60.f;
if(frame_time_average>0)
fps = 1000.f/frame_time_average;
++current_frame;
return fps;
}
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