diff --git a/renderer/src/gpu/renderer.rs b/renderer/src/gpu/renderer.rs
index b32d890e..1901c862 100644
--- a/renderer/src/gpu/renderer.rs
+++ b/renderer/src/gpu/renderer.rs
@@ -538,18 +538,16 @@ where
                 Some(ColorF::new(1.0, 1.0, 1.0, 1.0))
             };
 
-        let textures = vec![self.device.framebuffer_texture(&self.fill_framebuffer)];
-        let uniforms = vec![
-            (&self.mask_winding_tile_program.mask_texture_uniform, UniformData::TextureUnit(0)),
-        ];
-
         self.device.draw_elements(tile_count * 6, &RenderState {
             target: &RenderTarget::Framebuffer(&self.mask_framebuffer),
             program: &self.mask_winding_tile_program.program,
             vertex_array: &self.mask_winding_tile_vertex_array.vertex_array,
             primitive: Primitive::Triangles,
-            textures: &textures,
-            uniforms: &uniforms,
+            textures: &[self.device.framebuffer_texture(&self.fill_framebuffer)],
+            uniforms: &[
+                (&self.mask_winding_tile_program.mask_texture_uniform,
+                 UniformData::TextureUnit(0)),
+            ],
             viewport: self.mask_viewport(),
             options: RenderOptions {
                 // TODO(pcwalton): MIN blending for masks.
diff --git a/resources/shaders/gl3/mask_winding.vs.glsl b/resources/shaders/gl3/mask_winding.vs.glsl
index 788b2c73..2bd98862 100644
--- a/resources/shaders/gl3/mask_winding.vs.glsl
+++ b/resources/shaders/gl3/mask_winding.vs.glsl
@@ -24,6 +24,6 @@ out float vBackdrop;
 void main(){
     vMaskTexCoord = aMaskTexCoord;
     vBackdrop = float(aBackdrop);
-    gl_Position = vec4(mix(vec2(- 1.0, - 1.0), vec2(1.0, 1.0), aPosition), 0.0, 1.0);
+    gl_Position = vec4(mix(vec2(- 1.0, 1.0), vec2(1.0, - 1.0), aPosition), 0.0, 1.0);
 }
 
diff --git a/resources/shaders/metal/mask_winding.vs.metal b/resources/shaders/metal/mask_winding.vs.metal
index 418f997f..6cce4f2f 100644
--- a/resources/shaders/metal/mask_winding.vs.metal
+++ b/resources/shaders/metal/mask_winding.vs.metal
@@ -23,7 +23,7 @@ vertex main0_out main0(main0_in in [[stage_in]])
     main0_out out = {};
     out.vMaskTexCoord = in.aMaskTexCoord;
     out.vBackdrop = float(in.aBackdrop);
-    out.gl_Position = float4(mix(float2(-1.0), float2(1.0), in.aPosition), 0.0, 1.0);
+    out.gl_Position = float4(mix(float2(-1.0, 1.0), float2(1.0, -1.0), in.aPosition), 0.0, 1.0);
     return out;
 }
 
diff --git a/shaders/mask_winding.vs.glsl b/shaders/mask_winding.vs.glsl
index 495df8e1..c757cb1f 100644
--- a/shaders/mask_winding.vs.glsl
+++ b/shaders/mask_winding.vs.glsl
@@ -22,5 +22,5 @@ out float vBackdrop;
 void main() {
     vMaskTexCoord = aMaskTexCoord;
     vBackdrop = float(aBackdrop);
-    gl_Position = vec4(mix(vec2(-1.0, -1.0), vec2(1.0, 1.0), aPosition), 0.0, 1.0);
+    gl_Position = vec4(mix(vec2(-1.0, 1.0), vec2(1.0, -1.0), aPosition), 0.0, 1.0);
 }