mirror of
https://github.com/hajimehoshi/ebiten.git
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83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
/*
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Copyright 2014 Hajime Hoshi
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ebiten
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// A Rect represents a rectangle.
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type Rect struct {
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X int
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Y int
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Width int
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Height int
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}
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// A TexturePart represents a part of a texture.
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type TexturePart struct {
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LocationX int
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LocationY int
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Source Rect
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}
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// A Drawer is the interface that draws itself.
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type Drawer interface {
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Draw(parts []TexturePart, geo GeometryMatrix, color ColorMatrix)
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}
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// DrawWhole draws the whole texture.
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func DrawWhole(drawer Drawer, width, height int, geo GeometryMatrix, color ColorMatrix) {
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parts := []TexturePart{
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{0, 0, Rect{0, 0, width, height}},
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}
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drawer.Draw(parts, geo, color)
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}
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// A Context is the interface that means a context of rendering.
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type GraphicsContext interface {
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Clear()
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Fill(r, g, b uint8)
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Texture(id TextureID) Drawer
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RenderTarget(id RenderTargetID) Drawer
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ResetOffscreen()
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SetOffscreen(id RenderTargetID)
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}
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// Filter represents the type of filter to be used when a texture or a render
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// target is maginified or minified.
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type Filter int
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const (
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FilterNearest Filter = iota
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FilterLinear
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)
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// TextureID represents an ID of a texture.
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type TextureID int
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// IsNil returns true if the texture is nil.
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func (i TextureID) IsNil() bool {
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return i == 0
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}
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// RenderTargetID represents an ID of a render target.
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// A render target is essentially same as a texture, but it is assumed that the
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// all alpha of a render target is maximum.
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type RenderTargetID int
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// IsNil returns true if the render target is nil.
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func (i RenderTargetID) IsNil() bool {
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return i == 0
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}
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