mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
package opengl
|
|
|
|
import (
|
|
"github.com/go-gl/gl"
|
|
"github.com/hajimehoshi/ebiten/graphics"
|
|
"image"
|
|
)
|
|
|
|
type Texture struct {
|
|
native gl.Texture
|
|
width int
|
|
height int
|
|
}
|
|
|
|
func createNativeTexture(textureWidth, textureHeight int, pixels []uint8, filter graphics.Filter) gl.Texture {
|
|
nativeTexture := gl.GenTexture()
|
|
if nativeTexture < 0 {
|
|
panic("glGenTexture failed")
|
|
}
|
|
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
|
|
nativeTexture.Bind(gl.TEXTURE_2D)
|
|
defer gl.Texture(0).Bind(gl.TEXTURE_2D)
|
|
|
|
glFilter := 0
|
|
switch filter {
|
|
case graphics.FilterLinear:
|
|
glFilter = gl.LINEAR
|
|
case graphics.FilterNearest:
|
|
glFilter = gl.NEAREST
|
|
default:
|
|
panic("not reached")
|
|
}
|
|
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, glFilter)
|
|
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, glFilter)
|
|
|
|
ptr := interface{}(nil)
|
|
if pixels != nil {
|
|
ptr = pixels
|
|
}
|
|
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, textureWidth, textureHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, ptr)
|
|
|
|
return nativeTexture
|
|
}
|
|
|
|
func createTexture(width, height int, filter graphics.Filter) (*Texture, error) {
|
|
w := graphics.AdjustSizeForTexture(width)
|
|
h := graphics.AdjustSizeForTexture(height)
|
|
native := createNativeTexture(w, h, nil, filter)
|
|
return &Texture{native, width, height}, nil
|
|
}
|
|
|
|
func createTextureFromImage(img image.Image, filter graphics.Filter) (*Texture, error) {
|
|
adjustedImage := graphics.AdjustImageForTexture(img)
|
|
size := adjustedImage.Bounds().Size()
|
|
native := createNativeTexture(size.X, size.Y, adjustedImage.Pix, filter)
|
|
return &Texture{native, size.X, size.Y}, nil
|
|
}
|
|
|
|
func (t *Texture) dispose() {
|
|
t.native.Delete()
|
|
}
|