From 126a6d513d387ce3da31d559ce833706fafa0a4a Mon Sep 17 00:00:00 2001
From: Dan Lipsa <dan.lipsa@kitware.com>
Date: Wed, 7 Dec 2016 09:32:22 -0500
Subject: [PATCH] ENH: Add GenerateMipmap support to vtkGeometryRepresentation

---
 Rendering/OpenGL2/vtkOpenGLTexture.cxx |  1 +
 Rendering/OpenGL2/vtkTextureObject.cxx | 34 +++++++++++++++++++++++++---------
 2 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/Rendering/OpenGL2/vtkOpenGLTexture.cxx b/Rendering/OpenGL2/vtkOpenGLTexture.cxx
index b8fa8aa..60dc860 100644
--- a/Rendering/OpenGL2/vtkOpenGLTexture.cxx
+++ b/Rendering/OpenGL2/vtkOpenGLTexture.cxx
@@ -258,6 +258,7 @@ void vtkOpenGLTexture::Load(vtkRenderer *ren)
       }
       else
       {
+        this->TextureObject->SetGenerateMipmap(true);
         this->TextureObject->Create2DFromRaw(
           xsize, ysize, bytesPerPixel, VTK_UNSIGNED_CHAR, resultData);
       }
diff --git a/Rendering/OpenGL2/vtkTextureObject.cxx b/Rendering/OpenGL2/vtkTextureObject.cxx
index 83a5ba1..f1532e9 100644
--- a/Rendering/OpenGL2/vtkTextureObject.cxx
+++ b/Rendering/OpenGL2/vtkTextureObject.cxx
@@ -1581,19 +1581,35 @@ bool vtkTextureObject::Create2DFromRaw(unsigned int width, unsigned int height,
   this->CreateTexture();
   this->Bind();
 
+  if (this->GenerateMipmap)
+  {
+    //this->SetMaxLevel(log2(std::max(this->Width, this->Height)));
+    //this->SetMinificationFilter(NearestMipmapNearest);
+
+    glTexParameteri(this->Target, GL_TEXTURE_MIN_FILTER,
+                    this->GetMinificationFilterMode(NearestMipmapNearest));
+    glTexParameteri(this->Target, GL_TEXTURE_BASE_LEVEL, 0);
+    glTexParameteri(this->Target, GL_TEXTURE_MAX_LEVEL, log2(std::max(this->Width, this->Height)));
+  }
+
+
   // Source texture data from the PBO.
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 
   glTexImage2D(
-        this->Target,
-        0,
-        this->InternalFormat,
-        static_cast<GLsizei>(this->Width),
-        static_cast<GLsizei>(this->Height),
-        0,
-        this->Format,
-        this->Type,
-        static_cast<const GLvoid *>(data));
+    this->Target,
+    0,
+    this->InternalFormat,
+    static_cast<GLsizei>(this->Width),
+    static_cast<GLsizei>(this->Height),
+    0,
+    this->Format,
+    this->Type,
+    static_cast<const GLvoid *>(data));
+  if (this->GenerateMipmap)
+  {
+    glGenerateMipmap(this->Target);
+  }
 
   vtkOpenGLCheckErrorMacro("failed at glTexImage2D");
 
-- 
2.9.3