From 1f462998702b77abf176821e95957a65ecced12c Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sat, 16 Feb 2019 15:14:48 +0900
Subject: [PATCH] graphicsdriver/opengl: Bug fix: source_size can be optimized
 out with nearest filter

---
 internal/graphicsdriver/opengl/program.go | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/internal/graphicsdriver/opengl/program.go b/internal/graphicsdriver/opengl/program.go
index 09c4c1ead..c091959e6 100644
--- a/internal/graphicsdriver/opengl/program.go
+++ b/internal/graphicsdriver/opengl/program.go
@@ -323,10 +323,15 @@ func (d *Driver) useProgram(mode graphics.CompositeMode, colorM *affine.ColorM,
 	sw := graphics.InternalImageSize(srcW)
 	sh := graphics.InternalImageSize(srcH)
 
-	if d.state.lastSourceWidth != sw || d.state.lastSourceHeight != sh {
-		d.context.uniformFloats(program, "source_size", []float32{float32(sw), float32(sh)})
-		d.state.lastSourceWidth = sw
-		d.state.lastSourceHeight = sh
+	if filter == graphics.FilterNearest {
+		d.state.lastSourceWidth = 0
+		d.state.lastSourceHeight = 0
+	} else {
+		if d.state.lastSourceWidth != sw || d.state.lastSourceHeight != sh {
+			d.context.uniformFloats(program, "source_size", []float32{float32(sw), float32(sh)})
+			d.state.lastSourceWidth = sw
+			d.state.lastSourceHeight = sh
+		}
 	}
 
 	if filter == graphics.FilterScreen {