diff --git a/go.mod b/go.mod
index 7cc48a90..31681445 100644
--- a/go.mod
+++ b/go.mod
@@ -10,5 +10,5 @@ require (
 
 require (
 	gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2
-	gioui.org/shader v0.0.0-20210816161847-c12352edbd45
+	gioui.org/shader v0.0.0-20210820085839-484f7c0305de
 )
diff --git a/go.sum b/go.sum
index 595a0c55..26efce91 100644
--- a/go.sum
+++ b/go.sum
@@ -4,8 +4,8 @@ dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7
 gioui.org/cpu v0.0.0-20210808092351-bfe733dd3334/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
 gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 h1:AGDDxsJE1RpcXTAxPG2B4jrwVUJGFDjINIPi1jtO6pc=
 gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
-gioui.org/shader v0.0.0-20210816161847-c12352edbd45 h1:tWCgnOK33iYKNvQ4ctNHBknZ6r273Na82wcTOFc29ZM=
-gioui.org/shader v0.0.0-20210816161847-c12352edbd45/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
+gioui.org/shader v0.0.0-20210820085839-484f7c0305de h1:fkcZh0i9T0SzMlqiDm2GBVqXZsbX6bevHcJHfR0llcg=
+gioui.org/shader v0.0.0-20210820085839-484f7c0305de/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
diff --git a/gpu/compute.go b/gpu/compute.go
index cffc6353..33f9c7c8 100644
--- a/gpu/compute.go
+++ b/gpu/compute.go
@@ -893,9 +893,10 @@ restart:
 			m.cpuTex = cpu.NewImageRGBA(texSize, texSize)
 		}
 	}
-	// Transform to clip space: [-1, -1] - [1, 1].
-	g.materials.vert.uniforms.scale = [2]float32{2 / float32(texSize), 2 / float32(texSize)}
-	g.materials.vert.uniforms.pos = [2]float32{-1, -1}
+	// Transform to clip space: [-1, -1] - [1, 1] and flip Y-axis to cancel the implied transformation
+	// between framebuffer and texture space.
+	g.materials.vert.uniforms.scale = [2]float32{2 / float32(texSize), -2 / float32(texSize)}
+	g.materials.vert.uniforms.pos = [2]float32{-1, +1}
 	g.materials.vert.buf.Upload(byteslice.Struct(g.materials.vert.uniforms))
 	vertexData := byteslice.Slice(m.quads)
 	n := pow2Ceil(len(vertexData))
diff --git a/gpu/gpu.go b/gpu/gpu.go
index 318c1a1d..4bdf5347 100644
--- a/gpu/gpu.go
+++ b/gpu/gpu.go
@@ -135,7 +135,7 @@ type imageOp struct {
 
 // shaderModuleVersion is the exact version of gioui.org/shader expected by
 // this package. Shader programs are not backwards or forwards compatible.
-const shaderModuleVersion = "v0.0.0-20210816161847-c12352edbd45"
+const shaderModuleVersion = "v0.0.0-20210820085839-484f7c0305de"
 
 func decodeStrokeOp(data []byte) clip.StrokeStyle {
 	_ = data[4]