vtk_glew.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtk_glew_h
#define vtk_glew_h

/* Use the glew library configured for VTK.  */
#define VTK_MODULE_USE_EXTERNAL_vtkglew 0

#define GLEW_NO_GLU
#define VTK_OPENGL_ES_VERSION 30

/* Mobile device support. */
#define VTK_MODULE_vtkglew_GLES3 0

#ifdef __APPLE__
#define GLES_SILENCE_DEPRECATION
#include "TargetConditionals.h"
#endif

#define VTK_GLEW_SHARED 1
#if !VTK_GLEW_SHARED && !defined(GLEW_STATIC)
#define GLEW_STATIC
#endif

#if VTK_MODULE_vtkglew_GLES3
#include <GLES3/gl3.h>
#elif TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
#include <OpenGLES/ES3/gl.h>
#elif VTK_MODULE_USE_EXTERNAL_vtkglew
#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
#endif

/* some fixes for both ES 2 and 3 */
#ifdef GL_ES_VERSION_3_0
#define GL_BACK_LEFT GL_BACK
#define GL_BACK_RIGHT GL_BACK
#define GL_FRONT_LEFT GL_FRONT
#define GL_FRONT_RIGHT GL_FRONT

/* 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]));                   \
  }
#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
#endif

#endif