mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package graphics
|
|
|
|
import (
|
|
"errors"
|
|
"github.com/hajimehoshi/ebiten/internal"
|
|
"github.com/hajimehoshi/ebiten/internal/opengl"
|
|
"image"
|
|
"image/draw"
|
|
)
|
|
|
|
func adjustImageForTexture(img image.Image) *image.RGBA {
|
|
width, height := img.Bounds().Size().X, img.Bounds().Size().Y
|
|
adjustedImageBounds := image.Rectangle{
|
|
image.ZP,
|
|
image.Point{
|
|
internal.NextPowerOf2Int(width),
|
|
internal.NextPowerOf2Int(height),
|
|
},
|
|
}
|
|
if adjustedImage, ok := img.(*image.RGBA); ok && img.Bounds() == adjustedImageBounds {
|
|
return adjustedImage
|
|
}
|
|
|
|
adjustedImage := image.NewRGBA(adjustedImageBounds)
|
|
dstBounds := image.Rectangle{
|
|
image.ZP,
|
|
img.Bounds().Size(),
|
|
}
|
|
draw.Draw(adjustedImage, dstBounds, img, image.ZP, draw.Src)
|
|
return adjustedImage
|
|
}
|
|
|
|
type Texture struct {
|
|
native opengl.Texture
|
|
width int
|
|
height int
|
|
}
|
|
|
|
func (t *Texture) Size() (width, height int) {
|
|
return t.width, t.height
|
|
}
|
|
|
|
func NewTexture(c *opengl.Context, width, height int, filter opengl.Filter) (*Texture, error) {
|
|
w := internal.NextPowerOf2Int(width)
|
|
h := internal.NextPowerOf2Int(height)
|
|
if w < 4 {
|
|
return nil, errors.New("width must be equal or more than 4.")
|
|
}
|
|
if h < 4 {
|
|
return nil, errors.New("height must be equal or more than 4.")
|
|
}
|
|
native, err := c.NewTexture(w, h, nil, filter)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &Texture{native, width, height}, nil
|
|
}
|
|
|
|
func NewTextureFromImage(c *opengl.Context, img image.Image, filter opengl.Filter) (*Texture, error) {
|
|
origSize := img.Bounds().Size()
|
|
if origSize.X < 4 {
|
|
return nil, errors.New("width must be equal or more than 4.")
|
|
}
|
|
if origSize.Y < 4 {
|
|
return nil, errors.New("height must be equal or more than 4.")
|
|
}
|
|
adjustedImage := adjustImageForTexture(img)
|
|
size := adjustedImage.Bounds().Size()
|
|
native, err := c.NewTexture(size.X, size.Y, adjustedImage.Pix, filter)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &Texture{native, origSize.X, origSize.Y}, nil
|
|
}
|
|
|
|
func (t *Texture) Dispose(c *opengl.Context) {
|
|
c.DeleteTexture(t.native)
|
|
}
|
|
|
|
func (t *Texture) ReplacePixels(c *opengl.Context, p []uint8) error {
|
|
c.BindTexture(t.native)
|
|
c.TexSubImage2D(p, t.width, t.height)
|
|
return nil
|
|
}
|