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x/mobile: glimage transparent blend disabled on iOS or OS-X #13509

nobonobo opened this issue Dec 6, 2015 · 1 comment


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commented Dec 6, 2015

  • golang 1.5.2
  • OS-X 10.10 or iOS 9.1



iOS & OS-X default BLEND mode disabled.
patch for enable BLEND-mode

diff --git a/exp/gl/glutil/glimage.go b/exp/gl/glutil/glimage.go
index 497fd89..e8c6b5b 100644
--- a/exp/gl/glutil/glimage.go
+++ b/exp/gl/glutil/glimage.go
@@ -279,11 +279,12 @@ func (img *Image) Draw(sz size.Event, topLeft, topRight, bottomLeft geom.Point,
        glctx.BindBuffer(gl.ARRAY_BUFFER, glimage.quadXY)
        glctx.VertexAttribPointer(glimage.pos, 2, gl.FLOAT, false, 0, 0)

        glctx.BindBuffer(gl.ARRAY_BUFFER, glimage.quadUV)
        glctx.VertexAttribPointer(glimage.inUV, 2, gl.FLOAT, false, 0, 0)

+       glctx.Enable(gl.BLEND)
+       glctx.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
        glctx.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)


@nobonobo nobonobo changed the title x/mobile glimage transparent blend disabled on iOS or OS-X x/mobile: glimage transparent blend disabled on iOS or OS-X Dec 6, 2015


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commented Dec 7, 2015

I must was write these code in the application layer.

@nobonobo nobonobo closed this Dec 7, 2015

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