Fixed ES2 gradient problem

Task-number: QTRD-2453

+ changed gradient texture to a power-of-two size to avoid gradient errors on Android

Change-Id: I67b1c87d3143073ceb2523017e3968d16d0cd503
Change-Id: I67b1c87d3143073ceb2523017e3968d16d0cd503
Reviewed-by: Mika Salmela <mika.salmela@digia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/datavisualization/engine/shaders/surface_ES2.frag b/src/datavisualization/engine/shaders/surface_ES2.frag
index a9aec528..7f40ba4d 100644
--- a/src/datavisualization/engine/shaders/surface_ES2.frag
+++ b/src/datavisualization/engine/shaders/surface_ES2.frag
@@ -11,7 +11,7 @@ uniform highp float lightStrength;
 uniform highp float ambientStrength;
 
 void main() {
-    highp vec2 gradientUV = vec2(0.5, (coords_mdl.y + 1.0) / 2.0);
+    highp vec2 gradientUV = vec2(0.0, (coords_mdl.y + 1.001) / 2.0); // ~1000 pixel texture, we need a margin for 1/1000 rounding error
     highp vec3 materialDiffuseColor = texture2D(textureSampler, gradientUV).xyz;
     highp vec3 materialAmbientColor = vec3(ambientStrength, ambientStrength, ambientStrength) * materialDiffuseColor;
     highp vec3 materialSpecularColor = vec3(1.0, 1.0, 1.0);