default clamp to edge instead of repeat when creating image textures (#2186)

Author: mfiess

examples/pxScene2d/src/pxContextGL.cpp

@@ -888,8 +888,8 @@ class pxTextureOffscreen : public pxTexture
       glBindTexture(GL_TEXTURE_2D, mTextureName);   TRACK_TEX_CALLS();
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, PX_TEXTURE_MIN_FILTER);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, PX_TEXTURE_MAG_FILTER);
-      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
-      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 
       glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,