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/* DrawList.h
Copyright (c) 2014 by Michael Zahniser
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include "../Point.h"
#include "SpriteShader.h"
#include <cstdint>
#include <vector>
class Body;
class Sprite;
class Swizzle;
// Class for storing a list of textures to blit to the screen. This allows the
// work of calculating the transformation matrices to be done in a separate
// thread from the graphics thread. However, the SpriteShader class is also
// available for drawing individual sprites in contexts where putting them into
// a DrawList first does not make sense.
class DrawList {
public:
// Clear the list, also setting the global time step for animation.
void Clear(int step = 0, double zoom = 1.);
void SetCenter(const Point ¢er, const Point ¢erVelocity = Point());
// Add an object based on the Body class.
bool Add(const Body &body, double cloak = 0.);
// Add an object at the given position (rather than its own).
bool Add(const Body &body, Point position, double cloak = 0.);
// Add an object that should not be drawn with motion blur.
bool AddUnblurred(const Body &body);
// Add an object using a specific swizzle (rather than its own).
bool AddSwizzled(const Body &body, const Swizzle *swizzle, double cloak = 0.);
// Draw all the items in this list.
void Draw() const;
private:
// Determine if the given object should be drawn at all.
bool Cull(const Body &body, const Point &position, const Point &blur) const;
void Push(const Body &body, Point pos, Point blur, double cloak, const Swizzle *swizzle);
private:
int step = 0;
double zoom = 1.;
bool isHighDPI = false;
std::vector<SpriteShader::Item> items;
Point center;
Point centerVelocity;
};
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