47 lines
985 B
Go
47 lines
985 B
Go
package main
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import (
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"errors"
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"image"
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"image/draw"
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_ "image/png"
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"io"
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"github.com/go-gl/gl/v4.1-core/gl"
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)
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func newTexture(file io.Reader) (tex uint32, err error) {
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img, _, err := image.Decode(file)
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if err != nil {
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return 0, err
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}
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rgba := image.NewRGBA(img.Bounds())
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if rgba.Stride != rgba.Rect.Size().X*4 {
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return 0, errors.New("unsupported stride")
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}
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draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
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gl.GenTextures(1, &tex)
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gl.ActiveTexture(gl.TEXTURE0)
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gl.BindTexture(gl.TEXTURE_2D, tex)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
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gl.TexImage2D(
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gl.TEXTURE_2D,
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0,
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gl.RGBA,
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int32(rgba.Rect.Size().X),
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int32(rgba.Rect.Size().Y),
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0,
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gl.RGBA,
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gl.UNSIGNED_BYTE,
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gl.Ptr(rgba.Pix),
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)
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return
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}
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