ModuleRender.cpp

#include "Globals.h"
#include "Application.h"
#include "ModuleRender.h"

ModuleRender::ModuleRender(Application* app, bool start_enabled) : Module(app, start_enabled)
{
	renderer = NULL;
	camera.x = camera.y = 0;
	camera.w = SCREEN_WIDTH;
	camera.h = SCREEN_HEIGHT;
}

// Destructor
ModuleRender::~ModuleRender()
{}

// Called before render is available
bool ModuleRender::Init()
{
	LOG("Creating Renderer context");
	bool ret = true;
	Uint32 flags = 0;

	if(VSYNC == true)
	{
		flags |= SDL_RENDERER_PRESENTVSYNC;
	}

	renderer = SDL_CreateRenderer(App->window->window, -1, flags);
	
	if(renderer == NULL)
	{
		LOG("Renderer could not be created! SDL_Error: %s\n", SDL_GetError());
		ret = false;
	}

	return ret;
}

// PreUpdate: clear buffer
update_status ModuleRender::PreUpdate()
{
	SDL_RenderClear(renderer);
	return UPDATE_CONTINUE;
}

// Update: debug camera
update_status ModuleRender::Update()
{
	int speed = 3;

	if(App->input->GetKey(SDL_SCANCODE_UP) == KEY_REPEAT)
		App->renderer->camera.y += speed;

	if(App->input->GetKey(SDL_SCANCODE_DOWN) == KEY_REPEAT)
		App->renderer->camera.y -= speed;

	if(App->input->GetKey(SDL_SCANCODE_LEFT) == KEY_REPEAT)
		App->renderer->camera.x += speed;

	if(App->input->GetKey(SDL_SCANCODE_RIGHT) == KEY_REPEAT)
		App->renderer->camera.x -= speed;

	return UPDATE_CONTINUE;
}

// PostUpdate present buffer to screen
update_status ModuleRender::PostUpdate()
{
	SDL_RenderPresent(renderer);
	return UPDATE_CONTINUE;
}

// Called before quitting
bool ModuleRender::CleanUp()
{
	LOG("Destroying renderer");

	//Destroy window
	if(renderer != NULL)
	{
		SDL_DestroyRenderer(renderer);
	}

	return true;
}

// Blit to screen
bool ModuleRender::Blit(SDL_Texture* texture, int x, int y, SDL_Rect* section, float speed)
{
	bool ret = true;
	SDL_Rect rect;
	rect.x = (int) (camera.x * speed) + x * SCREEN_SIZE;
	rect.y = (int) (camera.y * speed) + y * SCREEN_SIZE;

	if(section != NULL)
	{
		rect.w = section->w;
		rect.h = section->h;
	}
	else
	{
		SDL_QueryTexture(texture, NULL, NULL, &rect.w, &rect.h);
	}

	rect.w *= SCREEN_SIZE;
	rect.h *= SCREEN_SIZE;

	if(SDL_RenderCopy(renderer, texture, section, &rect) != 0)
	{
		LOG("Cannot blit to screen. SDL_RenderCopy error: %s", SDL_GetError());
		ret = false;
	}

	return ret;
}