ModuleRender.cpp

#include "Globals.h"
#include "Application.h"
#include "ModuleWindow.h"
#include "ModuleRender.h"
#include <math.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_SetRenderDrawColor(renderer, 0, 0, 0, 0);
	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, double angle, int pivot_x, int pivot_y )
{
	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;

	SDL_Point* p = NULL;
	SDL_Point pivot;

	if(pivot_x != INT_MAX && pivot_y != INT_MAX)
	{
		pivot.x = pivot_x;
		pivot.y = pivot_y;
		p = &pivot;
	}

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

	return ret;
}

bool ModuleRender::DrawQuad(const SDL_Rect& rect, Uint8 r, Uint8 g, Uint8 b, Uint8 a, bool filled, bool use_camera)
{
	bool ret = true;

	SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
	SDL_SetRenderDrawColor(renderer, r, g, b, a);

	SDL_Rect rec(rect);
	if(use_camera)
	{
		rec.x = (int)(camera.x + rect.x * SCREEN_SIZE);
		rec.y = (int)(camera.y + rect.y * SCREEN_SIZE);
		rec.w *= SCREEN_SIZE;
		rec.h *= SCREEN_SIZE;
	}

	int result = (filled) ? SDL_RenderFillRect(renderer, &rec) : SDL_RenderDrawRect(renderer, &rec);
	
	if(result != 0)
	{
		LOG("Cannot draw quad to screen. SDL_RenderFillRect error: %s", SDL_GetError());
		ret = false;
	}

	return ret;
}

bool ModuleRender::DrawLine(int x1, int y1, int x2, int y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a, bool use_camera)
{
	bool ret = true;

	SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
	SDL_SetRenderDrawColor(renderer, r, g, b, a);

	int result = -1;

	if(use_camera)
		result = SDL_RenderDrawLine(renderer, camera.x + x1 * SCREEN_SIZE, camera.y + y1 * SCREEN_SIZE, camera.x + x2 * SCREEN_SIZE, camera.y + y2 * SCREEN_SIZE);
	else
		result = SDL_RenderDrawLine(renderer, x1 * SCREEN_SIZE, y1 * SCREEN_SIZE, x2 * SCREEN_SIZE, y2 * SCREEN_SIZE);

	if(result != 0)
	{
		LOG("Cannot draw quad to screen. SDL_RenderFillRect error: %s", SDL_GetError());
		ret = false;
	}

	return ret;
}

bool ModuleRender::DrawCircle(int x, int y, int radius, Uint8 r, Uint8 g, Uint8 b, Uint8 a, bool use_camera)
{
	bool ret = true;

	SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
	SDL_SetRenderDrawColor(renderer, r, g, b, a);

	int result = -1;
	SDL_Point points[360];

	float factor = (float) M_PI / 180.0f;

	for(uint i = 0; i < 360; ++i)
	{
		points[i].x = (int) (x + radius * cos( i * factor));
		points[i].y = (int) (y + radius * sin( i * factor));
	}

	result = SDL_RenderDrawPoints(renderer, points, 360);

	if(result != 0)
	{
		LOG("Cannot draw quad to screen. SDL_RenderFillRect error: %s", SDL_GetError());
		ret = false;
	}

	return ret;
}