/
systems.go
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/
systems.go
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// This file is part of Xtownrider.
//
// Copyright © 2020 The Xtownrider Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package libxtownrider
import (
"github.com/veandco/go-sdl2/sdl"
)
// RenderSystem is an ECS system that renders SpriteComponents.
func RenderSystem(entities []Entity, renderer *sdl.Renderer) {
renderer.Clear()
for _, entity := range entities {
if entity.SpriteComponent != nil {
renderer.Copy(entity.SpriteComponent.Texture, nil, &sdl.Rect{X: entity.TransformComponent.X, Y: entity.TransformComponent.Y,
W: entity.SpriteComponent.W, H: entity.SpriteComponent.H})
}
}
renderer.Present()
}
// FreeSystem deallocated and destroys everything.
func FreeSystem(entities []Entity) {
Log(LogTypeDebug, "Freeing...")
for _, entity := range entities {
if entity.SpriteComponent != nil && entity.SpriteComponent.Texture != nil {
entity.SpriteComponent.Texture.Destroy()
}
}
}