From 2fb5108bbeb92c900e8ceed65fe426f5bb78be65 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sun, 26 Jul 2020 00:03:52 +0900
Subject: [PATCH] shader: Rename viewportSize to textureDstSize

Updates #1239
---
 examples/shader/default.go    |  4 +---
 examples/shader/default_go.go |  2 +-
 shader.go                     | 10 +++++-----
 3 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/examples/shader/default.go b/examples/shader/default.go
index 3ecd38dbe..6c2625e86 100644
--- a/examples/shader/default.go
+++ b/examples/shader/default.go
@@ -19,10 +19,8 @@ package main
 var Time float
 var Cursor vec2
 
-// viewportSize is a predefined function.
-
 func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
-	pos := position.xy/viewportSize() + Cursor/viewportSize()/4
+	pos := position.xy/textureDstSize() + Cursor/textureDstSize()/4
 	clr := 0.0
 	clr += sin(pos.x*cos(Time/15)*80) + cos(pos.y*cos(Time/15)*10)
 	clr += sin(pos.y*sin(Time/10)*40) + cos(pos.x*sin(Time/25)*40)
diff --git a/examples/shader/default_go.go b/examples/shader/default_go.go
index 4317b3c54..97b7dda0a 100644
--- a/examples/shader/default_go.go
+++ b/examples/shader/default_go.go
@@ -3,4 +3,4 @@
 
 package main
 
-var default_go = []byte("// Copyright 2020 The Ebiten Authors\n//\n// Licensed under the Apache License, Version 2.0 (the \"License\");\n// you may not use this file except in compliance with the License.\n// You may obtain a copy of the License at\n//\n//     http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing, software\n// distributed under the License is distributed on an \"AS IS\" BASIS,\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n// See the License for the specific language governing permissions and\n// limitations under the License.\n\n// +build ignore\n\npackage main\n\nvar Time float\nvar Cursor vec2\n\n// viewportSize is a predefined function.\n\nfunc Fragment(position vec4, texCoord vec2, color vec4) vec4 {\n\tpos := position.xy/viewportSize() + Cursor/viewportSize()/4\n\tclr := 0.0\n\tclr += sin(pos.x*cos(Time/15)*80) + cos(pos.y*cos(Time/15)*10)\n\tclr += sin(pos.y*sin(Time/10)*40) + cos(pos.x*sin(Time/25)*40)\n\tclr += sin(pos.x*sin(Time/5)*10) + sin(pos.y*sin(Time/35)*80)\n\tclr *= sin(Time/10) * 0.5\n\treturn vec4(clr, clr*0.5, sin(clr+Time/3)*0.75, 1)\n}\n")
+var default_go = []byte("// Copyright 2020 The Ebiten Authors\n//\n// Licensed under the Apache License, Version 2.0 (the \"License\");\n// you may not use this file except in compliance with the License.\n// You may obtain a copy of the License at\n//\n//     http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing, software\n// distributed under the License is distributed on an \"AS IS\" BASIS,\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n// See the License for the specific language governing permissions and\n// limitations under the License.\n\n// +build ignore\n\npackage main\n\nvar Time float\nvar Cursor vec2\n\nfunc Fragment(position vec4, texCoord vec2, color vec4) vec4 {\n\tpos := position.xy/textureDstSize() + Cursor/textureDstSize()/4\n\tclr := 0.0\n\tclr += sin(pos.x*cos(Time/15)*80) + cos(pos.y*cos(Time/15)*10)\n\tclr += sin(pos.y*sin(Time/10)*40) + cos(pos.x*sin(Time/25)*40)\n\tclr += sin(pos.x*sin(Time/5)*10) + sin(pos.y*sin(Time/35)*80)\n\tclr *= sin(Time/10) * 0.5\n\treturn vec4(clr, clr*0.5, sin(clr+Time/3)*0.75, 1)\n}\n")
diff --git a/shader.go b/shader.go
index 627b424d8..57de4554b 100644
--- a/shader.go
+++ b/shader.go
@@ -29,16 +29,16 @@ var shaderSuffix string
 
 func init() {
 	shaderSuffix = `
-var __viewportSize vec2
+var __textureDstSize vec2
 
-func viewportSize() vec2 {
-	return __viewportSize
+func textureDstSize() vec2 {
+	return __textureDstSize
 }
 
 func __vertex(position vec2, texCoord vec2, color vec4) (vec4, vec2, vec4) {
 	return mat4(
-		2/viewportSize().x, 0, 0, 0,
-		0, 2/viewportSize().y, 0, 0,
+		2/textureDstSize().x, 0, 0, 0,
+		0, 2/textureDstSize().y, 0, 0,
 		0, 0, 1, 0,
 		-1, -1, 0, 1,
 	) * vec4(position, 0, 1), texCoord, color