make pick shader work when bars scroll

Change-Id: I9a3e0e36b212ff49ad22ac0ff267d04476b4c307

2 files changed, 10 insertions, 2 deletions

diff --git a/chart2/opengl/pickingFragmentShader.glsl b/chart2/opengl/pickingFragmentShader.glsl
index 805789e731ed..e2fba0391442 100644
--- a/chart2/opengl/pickingFragmentShader.glsl
+++ b/chart2/opengl/pickingFragmentShader.glsl
@@ -6,11 +6,14 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
-
+uniform float minCoordX;
+varying vec3 positionWorldspace;
 varying vec4 fragmentColor;
 
 void main()
 {
+    if (positionWorldspace.x <= minCoordX)
+        discard;
     gl_FragColor = fragmentColor;
 }
 
diff --git a/chart2/opengl/pickingVertexShader.glsl b/chart2/opengl/pickingVertexShader.glsl
index f32e3fd38a91..df71ae170f01 100644
--- a/chart2/opengl/pickingVertexShader.glsl
+++ b/chart2/opengl/pickingVertexShader.glsl
@@ -9,11 +9,16 @@
 
 attribute vec3 vPosition;
 uniform mat4 MVP;
+uniform mat4 M;
 uniform vec4 vColor;
+uniform float minCoordX;
+uniform float maxCoordX;
 varying vec4 fragmentColor;
-
+varying vec3 positionWorldspace;
 void main()
 {
+    positionWorldspace = (M * vec4(vPosition,1)).xyz;
+	  positionWorldspace.x = clamp(positionWorldspace.x, minCoordX, maxCoordX);
     gl_Position =  MVP * vec4(vPosition, 1);
     fragmentColor = vColor;
 }