From 97dff96ca248ef3e15f77a91a076e067d9cc809d Mon Sep 17 00:00:00 2001
From: Thomas Friedel <tomee6@gmail.com>
Date: Fri, 22 Feb 2019 15:49:53 +0100
Subject: [PATCH] removed unused shader variables

---
 backend/gogl/gogl.go    | 10 ----------
 backend/gogl/shaders.go | 10 ++--------
 2 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/backend/gogl/gogl.go b/backend/gogl/gogl.go
index 188c635..ba45027 100644
--- a/backend/gogl/gogl.go
+++ b/backend/gogl/gogl.go
@@ -328,18 +328,13 @@ func (b *GoGLBackend) useShader(style *backendbase.FillStyle) (vertexLoc uint32)
 		gl.UseProgram(b.rgr.ID)
 		from := mat(style.FillMatrix).mul(rg.from)
 		to := mat(style.FillMatrix).mul(rg.to)
-		dir := to.sub(from)
-		length := dir.len()
-		dir = dir.scale(1 / length)
 		gl.Uniform2f(b.rgr.CanvasSize, float32(b.fw), float32(b.fh))
 		inv := mat(style.FillMatrix).invert().f32()
 		gl.UniformMatrix3fv(b.rgr.Invmat, 1, false, &inv[0])
 		gl.Uniform2f(b.rgr.From, float32(from[0]), float32(from[1]))
 		gl.Uniform2f(b.rgr.To, float32(to[0]), float32(to[1]))
-		gl.Uniform2f(b.rgr.Dir, float32(dir[0]), float32(dir[1]))
 		gl.Uniform1f(b.rgr.RadFrom, float32(rg.radFrom))
 		gl.Uniform1f(b.rgr.RadTo, float32(rg.radTo))
-		gl.Uniform1f(b.rgr.Len, float32(length))
 		gl.Uniform1i(b.rgr.Gradient, 0)
 		gl.Uniform1f(b.rgr.GlobalAlpha, float32(style.Color.A)/255)
 		return b.rgr.Vertex
@@ -395,18 +390,13 @@ func (b *GoGLBackend) useAlphaShader(style *backendbase.FillStyle, alphaTexSlot
 		gl.UseProgram(b.rgar.ID)
 		from := mat(style.FillMatrix).mul(rg.from)
 		to := mat(style.FillMatrix).mul(rg.to)
-		dir := to.sub(from)
-		length := dir.len()
-		dir = dir.scale(1 / length)
 		gl.Uniform2f(b.rgar.CanvasSize, float32(b.fw), float32(b.fh))
 		inv := mat(style.FillMatrix).invert().f32()
 		gl.UniformMatrix3fv(b.rgar.Invmat, 1, false, &inv[0])
 		gl.Uniform2f(b.rgar.From, float32(from[0]), float32(from[1]))
 		gl.Uniform2f(b.rgar.To, float32(to[0]), float32(to[1]))
-		gl.Uniform2f(b.rgar.Dir, float32(dir[0]), float32(dir[1]))
 		gl.Uniform1f(b.rgar.RadFrom, float32(rg.radFrom))
 		gl.Uniform1f(b.rgar.RadTo, float32(rg.radTo))
-		gl.Uniform1f(b.rgar.Len, float32(length))
 		gl.Uniform1i(b.rgar.Gradient, 0)
 		gl.Uniform1i(b.rgar.AlphaTex, alphaTexSlot)
 		gl.Uniform1f(b.rgar.GlobalAlpha, float32(style.Color.A)/255)
diff --git a/backend/gogl/shaders.go b/backend/gogl/shaders.go
index 9656ca3..c42057e 100755
--- a/backend/gogl/shaders.go
+++ b/backend/gogl/shaders.go
@@ -92,9 +92,8 @@ precision mediump float;
 varying vec2 v_cp;
 uniform mat3 invmat;
 uniform sampler2D gradient;
-uniform vec2 from, to, dir;
+uniform vec2 from, to;
 uniform float radFrom, radTo;
-uniform float len;
 uniform float globalAlpha;
 bool isNaN(float v) {
   return v < 0.0 || 0.0 < v || v == 0.0 ? false : true;
@@ -222,9 +221,8 @@ varying vec2 v_cp;
 varying vec2 v_atc;
 uniform mat3 invmat;
 uniform sampler2D gradient;
-uniform vec2 from, to, dir;
+uniform vec2 from, to;
 uniform float radFrom, radTo;
-uniform float len;
 uniform sampler2D alphaTex;
 uniform float globalAlpha;
 bool isNaN(float v) {
@@ -409,10 +407,8 @@ type radialGradientShader struct {
 	Gradient    int32
 	From        int32
 	To          int32
-	Dir         int32
 	RadFrom     int32
 	RadTo       int32
-	Len         int32
 	GlobalAlpha int32
 }
 
@@ -459,10 +455,8 @@ type radialGradientAlphaShader struct {
 	Gradient      int32
 	From          int32
 	To            int32
-	Dir           int32
 	RadFrom       int32
 	RadTo         int32
-	Len           int32
 	AlphaTex      int32
 	GlobalAlpha   int32
 }