programming_tutorials/05_sdl_alapok/renderer.cpp

#include "renderer.h"

#include <cstdio>

void Renderer::present() {
	SDL_RenderPresent(_renderer);
}

void Renderer::set_draw_color(const Uint8 r, const Uint8 g, const Uint8 b, const Uint8 a) {
	SDL_SetRenderDrawColor(_renderer, r, g, b, a);
}

void Renderer::set_draw_color(const Color &color) {
	SDL_SetRenderDrawColor(_renderer, color.r, color.g, color.b, color.a);
}

void Renderer::clear() {
	SDL_RenderClear(_renderer);
}

void Renderer::draw_rect(const SDL_Rect &rect) {
	SDL_RenderFillRect(_renderer, &rect);
}
void Renderer::draw_rect(const Rect2 &rect) {
	SDL_Rect r = rect.as_rect();

	SDL_RenderFillRect(_renderer, &r);
}

void Renderer::draw_texture(const Texture &texture, const Rect2 &dst_rect) {
	SDL_Rect sr;

	sr.x = 0; 
	sr.y = 0;
	sr.w = texture.get_width();
	sr.h = texture.get_height();

	SDL_Rect dr = dst_rect.as_rect();

	SDL_RenderCopy(_renderer, texture.get_texture(), &sr, &dr);
}
void Renderer::draw_texture(const Texture &texture, const Rect2 &src_rect, const Rect2 &dst_rect) {
	SDL_Rect sr = src_rect.as_rect();
	SDL_Rect dr = dst_rect.as_rect();

	SDL_RenderCopy(_renderer, texture.get_texture(), &sr, &dr);
}
void Renderer::draw_texture(const Texture &texture, const Rect2 &src_rect, const Rect2 &dst_rect, const double angle, const float cx, const float cy, const SDL_RendererFlip flip) {
	SDL_Rect sr = src_rect.as_rect();
	SDL_FRect dr = dst_rect.as_frect();

	SDL_FPoint p;

	p.x = cx;
	p.y = cy;

	SDL_RenderCopyExF(_renderer, texture.get_texture(), &sr, &dr, angle, &p, flip);
}

int Renderer::get_dpi() const {
	float ddpi;
	float hdpi;
	float vdpi;

	if (SDL_GetDisplayDPI(_window_display_index, &ddpi, &hdpi, &vdpi)) {
		return ddpi;
	}

	//fallback
	return 1;
}

int Renderer::get_size_w() const {
	int w;
	int h;

	SDL_GetWindowSize(_window, &w, &h);

	return w;
}

int Renderer::get_size_h() const {
	int w;
	int h;

	SDL_GetWindowSize(_window, &w, &h);

	return h;
}

void Renderer::get_size(int *w, int *h) const {
	SDL_GetWindowSize(_window, w, h);
}

void Renderer::initialize() {
	if (SDL_Init(_flags) != 0) {
		printf("SDL_Init() hiba!\n");

		return;
	}

	if (SDL_CreateWindowAndRenderer(_initial_window_width, _initial_window_height, _window_flags, &_window, &_renderer) != 0) {
		printf("SDL_CreateWindowAndRenderer() hiba!\n");

		return;
	}

	_window_display_index = SDL_GetWindowDisplayIndex(_window);
}

void Renderer::destroy() {
	if (_window)
		SDL_DestroyWindow(_window);

	if (_renderer)
		SDL_DestroyRenderer(_renderer);

	_window = nullptr;
	_renderer = nullptr;
}

SDL_Window *Renderer::get_window() {
	return _window;
}

SDL_Renderer *Renderer::get_renderer() {
	return _renderer;
}

Renderer::Renderer() {
	if (_singleton) {
		printf("Renderer::Renderer(): _singleton is not null!\n");
	}

	_initial_window_width = 640;
	_initial_window_height = 480;

	_singleton = this;

	_flags = SDL_INIT_VIDEO | SDL_INIT_TIMER;
	_window_flags = SDL_WINDOW_SHOWN;

	initialize();
}

Renderer::Renderer(unsigned int flags, unsigned int window_flags, int initial_window_width, int initial_window_height) {
	if (_singleton) {
		printf("Renderer::Renderer(flags): _singleton is not null!\n");
	}

	_initial_window_width = initial_window_width;
	_initial_window_height = initial_window_height;

	_singleton = this;

	_flags = flags;
	_window_flags = window_flags;

	initialize();
}

Renderer::~Renderer() {
	if (_singleton != this) {
		printf("Renderer::~Renderer(): _singleton is not this!\n");
	}

	_singleton = nullptr;

	destroy();
}

Renderer *Renderer::get_singleton() {
	return _singleton;
}

Renderer *Renderer::_singleton = nullptr;