From 2b897106001b03f98963ef9d31afe8f5f83b0d3d Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sat, 8 Aug 2020 18:05:58 +0900
Subject: [PATCH] graphicsdriver/metal: Refactoring

---
 internal/graphicsdriver/metal/graphics.go | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/internal/graphicsdriver/metal/graphics.go b/internal/graphicsdriver/metal/graphics.go
index 4923313ae..d85464bba 100644
--- a/internal/graphicsdriver/metal/graphics.go
+++ b/internal/graphicsdriver/metal/graphics.go
@@ -116,11 +116,12 @@ inline float2 AdjustTexelByAddress<ADDRESS_REPEAT>(float2 p, float4 source_regio
 template<uint8_t filter, uint8_t address>
 struct ColorFromTexel;
 
+constexpr sampler texture_sampler{filter::nearest};
+
 template<>
 struct ColorFromTexel<FILTER_NEAREST, ADDRESS_UNSAFE> {
   inline float4 Do(VertexOut v, texture2d<float> texture, constant float2& source_size, float scale, constant float4& source_region) {
     float2 p = v.tex;
-    constexpr sampler texture_sampler(filter::nearest);
     return texture.sample(texture_sampler, p);
   }
 };
@@ -133,7 +134,6 @@ struct ColorFromTexel<FILTER_NEAREST, address> {
         source_region[1] <= p.y &&
         p.x < source_region[2] &&
         p.y < source_region[3]) {
-      constexpr sampler texture_sampler(filter::nearest);
       return texture.sample(texture_sampler, p);
     }
     return 0.0;
@@ -143,7 +143,6 @@ struct ColorFromTexel<FILTER_NEAREST, address> {
 template<>
 struct ColorFromTexel<FILTER_LINEAR, ADDRESS_UNSAFE> {
   inline float4 Do(VertexOut v, texture2d<float> texture, constant float2& source_size, float scale, constant float4& source_region) {
-    constexpr sampler texture_sampler(filter::nearest);
     const float2 texel_size = 1 / source_size;
 
     // Shift 1/512 [texel] to avoid the tie-breaking issue.
@@ -164,7 +163,6 @@ struct ColorFromTexel<FILTER_LINEAR, ADDRESS_UNSAFE> {
 template<uint8_t address>
 struct ColorFromTexel<FILTER_LINEAR, address> {
   inline float4 Do(VertexOut v, texture2d<float> texture, constant float2& source_size, float scale, constant float4& source_region) {
-    constexpr sampler texture_sampler(filter::nearest);
     const float2 texel_size = 1 / source_size;
 
     // Shift 1/512 [texel] to avoid the tie-breaking issue.
@@ -204,7 +202,6 @@ struct ColorFromTexel<FILTER_LINEAR, address> {
 template<uint8_t address>
 struct ColorFromTexel<FILTER_SCREEN, address> {
   inline float4 Do(VertexOut v, texture2d<float> texture, constant float2& source_size, float scale, constant float4& source_region) {
-    constexpr sampler texture_sampler(filter::nearest);
     const float2 texel_size = 1 / source_size;
 
     float2 p0 = v.tex - texel_size / 2.0 / scale + (texel_size / 512.0);