Gradient support Part 1

TODO:
 - Finish scatter
 - QML (maybe left until data set is sorted, though)

Change-Id: I87a8117cb29f147080e0662c55b1098cb2e71689
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/datavisualization/engine/shaders/colorOnY.frag b/src/datavisualization/engine/shaders/colorOnY.frag
index 80e54a61..caea959b 100644
--- a/src/datavisualization/engine/shaders/colorOnY.frag
+++ b/src/datavisualization/engine/shaders/colorOnY.frag
@@ -1,9 +1,11 @@
 #version 120
 
 uniform highp vec3 lightPosition_wrld;
-uniform highp vec3 color_mdl;
 uniform highp float lightStrength;
 uniform highp float ambientStrength;
+uniform sampler2D textureSampler;
+uniform highp float gradMin;
+uniform highp float gradHeight;
 
 varying highp vec3 position_wrld;
 varying highp vec3 normal_cmr;
@@ -12,8 +14,8 @@ varying highp vec3 lightDirection_cmr;
 varying highp vec2 coords_mdl;
 
 void main() {
-    highp float heightMod = (coords_mdl.y * 0.3) + 0.7; // Add 30% black to the bottom
-    highp vec3 materialDiffuseColor = heightMod * color_mdl;
+    highp vec2 gradientUV = vec2(0.0, gradMin + ((coords_mdl.y + 1.0) * gradHeight));
+    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);