vtk/0001-clean-up-some-old-opengl-es-stuff.patch

From 13956bf0d47391046e7bb08bb0b581d0850738a9 Mon Sep 17 00:00:00 2001
From: Ken Martin <ken.martin@kitware.com>
Date: Tue, 23 Jun 2020 14:31:15 -0400
Subject: [PATCH] clean up some old opengl es stuff

No longer have the version option so remove

Partially implement 1D textures as 2D
---
 Examples/Android/ReadMe.txt            |  6 +-
 Rendering/OpenGL2/CMakeLists.txt       |  6 +-
 Rendering/OpenGL2/vtkTextureObject.cxx | 95 +++++++++++++++++++++++++-
 ThirdParty/glew/vtk_glew.h.in          | 45 ++++++------
 4 files changed, 118 insertions(+), 34 deletions(-)

diff --git a/Examples/Android/ReadMe.txt b/Examples/Android/ReadMe.txt
index 7b43476bdd..9c6f5a102d 100644
--- a/Examples/Android/ReadMe.txt
+++ b/Examples/Android/ReadMe.txt
@@ -41,10 +41,6 @@ To build VTK and these examples follow the steps below.
 * Run cmake on vtkandroid with -DVTK_ANDROID_BUILD=ON, if you use the gui add a
 * boolean entry with that name prior to configuring and set it on.
 
-If you want OpenGL ES 3.0 support make sure to change the setting of
-OPENGL_ES_VERSION to 3.0. Volume Rendering requires ES 3.0. Make sure to turn on
-VTK_BUILD_EXAMPLES
-
 * configure and generate as usual
 
 * Once done run ninja or make as appropriate
@@ -60,4 +56,4 @@ cd into CMakeExternals/Build/vtk-android/Examples/Android/ExampleName/bin
 
 You should see some apk files in this directory.
 
-You can adb install -r ExampleName-debug.apk and then run the example on your device
\ No newline at end of file
+You can adb install -r ExampleName-debug.apk and then run the example on your device
diff --git a/Rendering/OpenGL2/CMakeLists.txt b/Rendering/OpenGL2/CMakeLists.txt
index da43adb85f..0ea0ee3200 100644
--- a/Rendering/OpenGL2/CMakeLists.txt
+++ b/Rendering/OpenGL2/CMakeLists.txt
@@ -3,6 +3,7 @@ set(classes
   vtkClearRGBPass
   vtkClearZPass
   vtkCompositePolyDataMapper2
+  vtkDataTransferHelper
   vtkDefaultPass
   vtkDepthImageProcessingPass
   vtkDepthOfFieldPass
@@ -93,11 +94,6 @@ set(classes
   vtkValuePass
   vtkVolumetricPass)
 
-if (NOT DEFINED OPENGL_ES_VERSION)
-  list(APPEND classes
-    vtkDataTransferHelper)
-endif()
-
 set(headers
   vtkCompositePolyDataMapper2Internal.h
   vtkOpenGL.h
   vtkStateStorage.h
diff --git a/Rendering/OpenGL2/vtkTextureObject.cxx b/Rendering/OpenGL2/vtkTextureObject.cxx
index 6afef26d97..b491c62e89 100644
--- a/Rendering/OpenGL2/vtkTextureObject.cxx
+++ b/Rendering/OpenGL2/vtkTextureObject.cxx
@@ -1030,6 +1030,99 @@ bool vtkTextureObject::CreateTextureBuffer(
 
 #else
 
+// Emulate 1D textures as 2D. Note that the any shader code will likely
+// have to be modified as well for this to work.
+
+//------------------------------------------------------------------------------
+bool vtkTextureObject::Create1D(
+  int numComps, vtkPixelBufferObject* pbo, bool shaderSupportsTextureInt)
+{
+  assert(this->Context);
+  assert(pbo->GetContext() == this->Context.GetPointer());
+
+  GLenum target = GL_TEXTURE_2D;
+
+  // Now, determine texture parameters using the information from the pbo.
+
+  // * internalFormat depends on number of components and the data type.
+  GLenum internalFormat =
+    this->GetInternalFormat(pbo->GetType(), numComps, shaderSupportsTextureInt);
+
+  // * format depends on the number of components.
+  GLenum format = this->GetFormat(pbo->GetType(), numComps, shaderSupportsTextureInt);
+
+  // * type if the data type in the pbo
+  GLenum type = this->GetDefaultDataType(pbo->GetType());
+
+  if (!internalFormat || !format || !type)
+  {
+    vtkErrorMacro("Failed to determine texture parameters.");
+    return false;
+  }
+
+  this->Target = target;
+  this->Context->ActivateTexture(this);
+  this->CreateTexture();
+  this->Bind();
+
+  pbo->Bind(vtkPixelBufferObject::UNPACKED_BUFFER);
+
+  // Source texture data from the PBO.
+  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+  glTexImage2D(target, 0, static_cast<GLint>(internalFormat),
+    static_cast<GLsizei>(pbo->GetSize() / static_cast<unsigned int>(numComps)), 1, 0, format, type,
+    BUFFER_OFFSET(0));
+  vtkOpenGLCheckErrorMacro("failed at glTexImage1D");
+  pbo->UnBind();
+  this->Deactivate();
+
+  this->Target = target;
+  this->Format = format;
+  this->Type = type;
+  this->Components = numComps;
+  this->Width = pbo->GetSize();
+  this->Height = 1;
+  this->Depth = 1;
+  this->NumberOfDimensions = 1;
+  return true;
+}
+
+//------------------------------------------------------------------------------
+bool vtkTextureObject::Create1DFromRaw(unsigned int width, int numComps, int dataType, void* data)
+{
+  assert(this->Context);
+
+  // Now determine the texture parameters using the arguments.
+  this->GetDataType(dataType);
+  this->GetInternalFormat(dataType, numComps, false);
+  this->GetFormat(dataType, numComps, false);
+
+  if (!this->InternalFormat || !this->Format || !this->Type)
+  {
+    vtkErrorMacro("Failed to determine texture parameters.");
+    return false;
+  }
+
+  GLenum target = GL_TEXTURE_2D;
+  this->Target = target;
+  this->Components = numComps;
+  this->Width = width;
+  this->Height = 1;
+  this->Depth = 1;
+  this->NumberOfDimensions = 1;
+  this->Context->ActivateTexture(this);
+  this->CreateTexture();
+  this->Bind();
+
+  glTexImage2D(this->Target, 0, this->InternalFormat, static_cast<GLsizei>(this->Width), 1, 0,
+    this->Format, this->Type, static_cast<const GLvoid*>(data));
+
+  vtkOpenGLCheckErrorMacro("failed at glTexImage1D");
+
+  this->Deactivate();
+  return true;
+}
+
 // Description:
 // Create a texture buffer basically a 1D texture that can be
 // very large for passing data into the fragment shader
@@ -1037,7 +1130,7 @@ bool vtkTextureObject::CreateTextureBuffer(
   unsigned int numValues, int numComps, int dataType, vtkOpenGLBufferObject* bo)
 {
   assert(this->Context);
-  vtkErrorMacro("TextureBuffers not supported in OPenGL ES");
+  vtkErrorMacro("TextureBuffers not supported in OpenGL ES");
   // TODO: implement 1D and Texture buffers using 2D textures
   return false;
 }
diff --git a/ThirdParty/glew/vtk_glew.h.in b/ThirdParty/glew/vtk_glew.h.in
index 6aa8c2ee9e..009f230b19 100644
--- a/ThirdParty/glew/vtk_glew.h.in
+++ b/ThirdParty/glew/vtk_glew.h.in
@@ -35,42 +35,41 @@
 #endif
 
 #if VTK_MODULE_vtkglew_GLES3
-#  include <GLES3/gl3.h>
+#include <GLES3/gl3.h>
 #elif TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
-#   include <OpenGLES/ES3/gl.h>
+#include <OpenGLES/ES3/gl.h>
 #elif VTK_MODULE_USE_EXTERNAL_vtkglew
-# include <GL/glew.h>
-# ifdef _WIN32
-#  include <GL/wglew.h>
-# endif
+#include <GL/glew.h>
+#ifdef _WIN32
+#include <GL/wglew.h>
+#endif
 #else
-# include <vtkglew/include/GL/glew.h>
-# ifdef _WIN32
-#  include <vtkglew/include/GL/wglew.h>
-# endif
+#include <vtkglew/include/GL/glew.h>
+#ifdef _WIN32
+#include <vtkglew/include/GL/wglew.h>
+#endif
 #endif
 
 /* some fixes for both ES 2 and 3 */
 #ifdef GL_ES_VERSION_3_0
-#  define glDrawBuffer(arg)
-#  define GL_BACK_LEFT 0
-#  define GL_BACK_RIGHT 0
-#  define GL_FRONT_LEFT 0
-#  define GL_FRONT_RIGHT 0
+#define glDrawBuffer(arg)
+#define GL_BACK_LEFT 0
+#define GL_BACK_RIGHT 0
+#define GL_FRONT_LEFT 0
+#define GL_FRONT_RIGHT 0
 
 /* this sends all the data each time as opposed to allowing a subset */
-#  define glMultiDrawElements(mode, counts, type, indicies, primcount) \
-      for (size_t eCount = 0; eCount < primcount; ++eCount) \
-        { \
-        glDrawElements(mode, *(counts + eCount), \
-          type, (GLvoid *)(indicies[eCount])); \
-        }
+#define glMultiDrawElements(mode, counts, type, indicies, primcount)                               \
+  for (size_t eCount = 0; eCount < primcount; ++eCount)                                            \
+  {                                                                                                \
+    glDrawElements(mode, *(counts + eCount), type, (GLvoid*)(indicies[eCount]));                   \
+  }
 #endif
 
 /*** deal with some GLES 3.0 specific issues ***/
 #ifdef GL_ES_VERSION_3_0
-#  define GLEW_ARB_vertex_array_object 1
-#  define GLEW_ARB_instanced_arrays 1
+#define GLEW_ARB_vertex_array_object 1
+#define GLEW_ARB_instanced_arrays 1
 #endif
 
 #endif
-- 
2.27.0