Updated to support GLES 2.0 on iOS and Android

CMakeLists.txt

@@ -99,12 +99,13 @@ set(CMAKE_SUPPRESS_REGENERATION TRUE)
 # Check for dependencies
 find_package(OpenMP)
 find_package(OpenGL)
+find_package(OpenGLES)
 find_package(OpenCL)
 find_package(CUDA)
 find_package(GLUT)
 find_package(PTex)
 
-if (NOT APPLE)
+if (NOT APPLE AND NOT ANDROID)
     find_package(GLEW REQUIRED)
 endif()
 
@@ -157,6 +158,12 @@ else()
         "shared module in your cmake installation.")
 endif()
 
+if(OPENGLES_FOUND)
+    add_definitions(
+        -DOPENSUBDIV_HAS_OPENGLES
+    )
+endif()
+
 if(OPENCL_FOUND)
     add_definitions(
         -DOPENSUBDIV_HAS_OPENCL
@@ -340,7 +347,9 @@ endmacro()
 
 add_subdirectory(opensubdiv)
 
-add_subdirectory(regression)
+if(NOT ANDROID AND NOT IOS) # XXXdyu
+    add_subdirectory(regression)
+endif()
 
 add_subdirectory(examples)
 

cmake/FindOpenGLES.cmake

@@ -0,0 +1,95 @@
+#
+#     Copyright (C) Pixar. All rights reserved.
+#
+#     This license governs use of the accompanying software. If you
+#     use the software, you accept this license. If you do not accept
+#     the license, do not use the software.
+#
+#     1. Definitions
+#     The terms "reproduce," "reproduction," "derivative works," and
+#     "distribution" have the same meaning here as under U.S.
+#     copyright law.  A "contribution" is the original software, or
+#     any additions or changes to the software.
+#     A "contributor" is any person or entity that distributes its
+#     contribution under this license.
+#     "Licensed patents" are a contributor's patent claims that read
+#     directly on its contribution.
+#
+#     2. Grant of Rights
+#     (A) Copyright Grant- Subject to the terms of this license,
+#     including the license conditions and limitations in section 3,
+#     each contributor grants you a non-exclusive, worldwide,
+#     royalty-free copyright license to reproduce its contribution,
+#     prepare derivative works of its contribution, and distribute
+#     its contribution or any derivative works that you create.
+#     (B) Patent Grant- Subject to the terms of this license,
+#     including the license conditions and limitations in section 3,
+#     each contributor grants you a non-exclusive, worldwide,
+#     royalty-free license under its licensed patents to make, have
+#     made, use, sell, offer for sale, import, and/or otherwise
+#     dispose of its contribution in the software or derivative works
+#     of the contribution in the software.
+#
+#     3. Conditions and Limitations
+#     (A) No Trademark License- This license does not grant you
+#     rights to use any contributor's name, logo, or trademarks.
+#     (B) If you bring a patent claim against any contributor over
+#     patents that you claim are infringed by the software, your
+#     patent license from such contributor to the software ends
+#     automatically.
+#     (C) If you distribute any portion of the software, you must
+#     retain all copyright, patent, trademark, and attribution
+#     notices that are present in the software.
+#     (D) If you distribute any portion of the software in source
+#     code form, you may do so only under this license by including a
+#     complete copy of this license with your distribution. If you
+#     distribute any portion of the software in compiled or object
+#     code form, you may only do so under a license that complies
+#     with this license.
+#     (E) The software is licensed "as-is." You bear the risk of
+#     using it. The contributors give no express warranties,
+#     guarantees or conditions. You may have additional consumer
+#     rights under your local laws which this license cannot change.
+#     To the extent permitted under your local laws, the contributors
+#     exclude the implied warranties of merchantability, fitness for
+#     a particular purpose and non-infringement.
+#
+
+# - Try to find OpenGLES
+# Once done this will define
+#  
+#  OPENGLES_FOUND        - system has OpenGLES
+#  OPENGLES_INCLUDE_DIR  - the GL include directory
+#  OPENGLES_LIBRARIES    - Link these to use OpenGLES
+
+if(ANDROID)
+    FIND_PATH(
+            OPENGLES_INCLUDE_DIR GLES2/gl2.h 
+            ${ANDROID_STANDALONE_TOOLCHAIN}/usr/include
+    )
+
+    FIND_LIBRARY(
+            OPENGLES_LIBRARIES NAMES  GLESv2
+            PATHS ${ANDROID_STANDALONE_TOOLCHAIN}/usr/lib
+    )
+
+elseif(IOS)
+    FIND_LIBRARY(
+            OPENGLES_FRAMEWORKS OpenGLES
+    )
+    if(OPENGLES_FRAMEWORKS)
+        set( OPENGLES_LIBRARIES "-framework OpenGLES" )
+    endif()
+
+endif()
+
+SET( OPENGLES_FOUND "NO" )
+IF(OPENGLES_LIBRARIES)
+    SET( OPENGLES_FOUND "YES" )
+ENDIF(OPENGLES_LIBRARIES)
+
+MARK_AS_ADVANCED(
+  OPENGLES_INCLUDE_DIR
+  OPENGLES_LIBRARIES
+)
+

opensubdiv/CMakeLists.txt

@@ -55,7 +55,9 @@
 #     a particular purpose and non-infringement.
 #
 
-add_subdirectory(tools/stringify)
+if(NOT ANDROID AND NOT IOS) # XXXdyu
+    add_subdirectory(tools/stringify)
+endif()
 
 add_subdirectory(hbr)
 

opensubdiv/osd/Android.mk

@@ -0,0 +1,79 @@
+#
+#     Copyright (C) Pixar. All rights reserved.
+#
+#     This license governs use of the accompanying software. If you
+#     use the software, you accept this license. If you do not accept
+#     the license, do not use the software.
+#
+#     1. Definitions
+#     The terms "reproduce," "reproduction," "derivative works," and
+#     "distribution" have the same meaning here as under U.S.
+#     copyright law.  A "contribution" is the original software, or
+#     any additions or changes to the software.
+#     A "contributor" is any person or entity that distributes its
+#     contribution under this license.
+#     "Licensed patents" are a contributor's patent claims that read
+#     directly on its contribution.
+#
+#     2. Grant of Rights
+#     (A) Copyright Grant- Subject to the terms of this license,
+#     including the license conditions and limitations in section 3,
+#     each contributor grants you a non-exclusive, worldwide,
+#     royalty-free copyright license to reproduce its contribution,
+#     prepare derivative works of its contribution, and distribute
+#     its contribution or any derivative works that you create.
+#     (B) Patent Grant- Subject to the terms of this license,
+#     including the license conditions and limitations in section 3,
+#     each contributor grants you a non-exclusive, worldwide,
+#     royalty-free license under its licensed patents to make, have
+#     made, use, sell, offer for sale, import, and/or otherwise
+#     dispose of its contribution in the software or derivative works
+#     of the contribution in the software.
+#
+#     3. Conditions and Limitations
+#     (A) No Trademark License- This license does not grant you
+#     rights to use any contributor's name, logo, or trademarks.
+#     (B) If you bring a patent claim against any contributor over
+#     patents that you claim are infringed by the software, your
+#     patent license from such contributor to the software ends
+#     automatically.
+#     (C) If you distribute any portion of the software, you must
+#     retain all copyright, patent, trademark, and attribution
+#     notices that are present in the software.
+#     (D) If you distribute any portion of the software in source
+#     code form, you may do so only under this license by including a
+#     complete copy of this license with your distribution. If you
+#     distribute any portion of the software in compiled or object
+#     code form, you may only do so under a license that complies
+#     with this license.
+#     (E) The software is licensed "as-is." You bear the risk of
+#     using it. The contributors give no express warranties,
+#     guarantees or conditions. You may have additional consumer
+#     rights under your local laws which this license cannot change.
+#     To the extent permitted under your local laws, the contributors
+#     exclude the implied warranties of merchantability, fitness for
+#     a particular purpose and non-infringement.
+#
+#
+
+# This file is used by the Android NDK to allow OpenSubdiv libraries
+# to be imported by client modules.
+
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE = OpenSubdivOsdCPU
+LOCAL_SRC_FILES = libs/armeabi-v7a/libosdCPU.so
+LOCAL_EXPORT_C_INCLUDES = $(LOCAL_PATH)/include
+
+include $(PREBUILT_SHARED_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE = OpenSubdivOsdGPU
+LOCAL_SRC_FILES = libs/armeabi-v7a/libosdGPU.so
+LOCAL_EXPORT_C_INCLUDES = $(LOCAL_PATH)/include
+
+include $(PREBUILT_SHARED_LIBRARY)
+

opensubdiv/osd/CMakeLists.txt

@@ -58,12 +58,21 @@
 
 #-------------------------------------------------------------------------------
 include_directories(
-    ${OPENGL_INCLUDE_DIR}
-    ${GLEW_INCLUDE_DIR}
     ${DXSDK_INCLUDE_DIR}
     ${PROJECT_SOURCE_DIR}/opensubdiv
 )
 
+if( OPENGL_FOUND )
+    include_directories(
+        ${OPENGL_INCLUDE_DIR}
+        ${GLEW_INCLUDE_DIR}
+    )
+elseif( OPENGLES_FOUND )
+    include_directories(
+        ${OPENGLES_INCLUDE_DIR}
+    )
+endif()
+
 #-------------------------------------------------------------------------------
 # source & headers
 set(CPU_SOURCE_FILES
@@ -94,6 +103,7 @@ set(PRIVATE_HEADER_FILES
 set(PUBLIC_HEADER_FILES
     computeContext.h
     computeController.h
+    cpuComputeContext.h
     cpuComputeController.h
     cpuDispatcher.h
     cpuVertexBuffer.h
@@ -104,6 +114,7 @@ set(PUBLIC_HEADER_FILES
     drawContext.h
     drawRegistry.h
     vertex.h
+    vertexDescriptor.h
 )
 
 #-------------------------------------------------------------------------------
@@ -168,7 +179,7 @@ endif()
 
 #-------------------------------------------------------------------------------
 # GL code & dependencies
-if( OPENGL_FOUND )
+if( OPENGL_FOUND OR OPENGLES_FOUND )
     list(APPEND GPU_SOURCE_FILES
         cpuGLVertexBuffer.cpp
         glDrawContext.cpp
@@ -182,17 +193,20 @@ if( OPENGL_FOUND )
         glVertexBuffer.h
         glMesh.h
     )
-    list(APPEND KERNEL_FILES
-        glslPatchCommon.glsl
-        glslPatchRegular.glsl
-        glslPatchBoundary.glsl
-        glslPatchCorner.glsl
-        glslPatchGregory.glsl
-        glslPatchBoundaryGregory.glsl
-        glslPatchTransition.glsl
-    )
+    if ( OPENGL_FOUND )
+        list(APPEND KERNEL_FILES
+            glslPatchCommon.glsl
+            glslPatchRegular.glsl
+            glslPatchBoundary.glsl
+            glslPatchCorner.glsl
+            glslPatchGregory.glsl
+            glslPatchBoundaryGregory.glsl
+            glslPatchTransition.glsl
+        )
+    endif()
     list(APPEND PLATFORM_LIBRARIES
         ${OPENGL_LIBRARY}
+        ${OPENGLES_LIBRARIES}
     )
 endif()
 
@@ -415,7 +429,7 @@ target_link_libraries(osd_static_gpu
 
 
 
-if (NOT WIN32)
+if (NOT WIN32 AND NOT IOS)
     _add_possibly_cuda_library(osd_dynamic_cpu SHARED
         ${CPU_SOURCE_FILES}
         ${PRIVATE_HEADER_FILES}
@@ -449,4 +463,10 @@ install( FILES ${PUBLIC_HEADER_FILES}
          DESTINATION include/osd
          PERMISSIONS OWNER_READ GROUP_READ WORLD_READ )
 
+if (ANDROID)
+    install( FILES Android.mk 
+             DESTINATION ${LIBRARY_OUTPUT_PATH_ROOT}
+             PERMISSIONS OWNER_READ GROUP_READ WORLD_READ )
+endif()
+
 #-------------------------------------------------------------------------------

opensubdiv/osd/clGLVertexBuffer.cpp

@@ -57,10 +57,10 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
-#else
+#if defined(__APPLE__)
     #include <OpenGL/gl3.h>
+#else
+    #include <GL/glew.h>
 #endif
 
 #include "../osd/clGLVertexBuffer.h"

opensubdiv/osd/clKernelBundle.cpp

@@ -60,7 +60,7 @@
 #elif defined(__APPLE__)
     #include <OpenGL/OpenGL.h>
 #else
-    #include <GL/glx.h>
+    #include <GL/gl.h>
 #endif
 
 #include "../osd/clKernelBundle.h"

opensubdiv/osd/cpuGLVertexBuffer.cpp

@@ -55,6 +55,22 @@
 //     a particular purpose and non-infringement.
 //
 
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/glew.h>
+#endif
+
 #include "../osd/cpuGLVertexBuffer.h"
 
 #include <string.h>
@@ -141,9 +157,11 @@ OsdCpuGLVertexBuffer::map() {
     glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &prev);
 
     _cpuBuffer = new float[size];
+#if defined(GL_VERSION_2_1)
     glBindBuffer(GL_ARRAY_BUFFER, _vbo);
     glGetBufferSubData(GL_ARRAY_BUFFER, 0, size * sizeof(float), _cpuBuffer);
     glBindBuffer(GL_ARRAY_BUFFER, prev);
+#endif
 }
 
 void

opensubdiv/osd/cpuGLVertexBuffer.h

@@ -60,10 +60,20 @@
 
 #include "../version.h"
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
 #else
-    #include <OpenGL/gl3.h>
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/gl.h>
 #endif
 
 namespace OpenSubdiv {

opensubdiv/osd/cudaGLVertexBuffer.cpp

@@ -55,10 +55,10 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
-#else
+#if defined(__APPLE__)
     #include <OpenGL/gl3.h>
+#else
+    #include <GL/glew.h>
 #endif
 
 #include <cuda_runtime.h>

opensubdiv/osd/glDrawContext.cpp

@@ -49,10 +49,20 @@
 //     (E) The software is licensed "as-is." You bear the risk of
 //     using it. The contributors give no express warranties,
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
 #else
-    #include <OpenGL/gl3.h>
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/glew.h>
 #endif
 
 #include "../far/dispatcher.h"
@@ -72,20 +82,13 @@ OsdGLDrawContext::OsdGLDrawContext() :
 
 OsdGLDrawContext::~OsdGLDrawContext()
 {
-    if (patchIndexBuffer)
-        glDeleteBuffers(1, &patchIndexBuffer);
-    if (vertexTextureBuffer)
-        glDeleteTextures(1, &vertexTextureBuffer);
-    if (vertexValenceTextureBuffer)
-        glDeleteTextures(1, &vertexValenceTextureBuffer);
-    if (quadOffsetTextureBuffer)
-        glDeleteTextures(1, &quadOffsetTextureBuffer);
-    if (patchLevelTextureBuffer)
-        glDeleteTextures(1, &patchLevelTextureBuffer);
-    if (ptexCoordinateTextureBuffer)
-        glDeleteTextures(1, &ptexCoordinateTextureBuffer);
-    if (fvarDataTextureBuffer)
-        glDeleteTextures(1, &fvarDataTextureBuffer);
+    glDeleteBuffers(1, &patchIndexBuffer);
+    glDeleteTextures(1, &vertexTextureBuffer);
+    glDeleteTextures(1, &vertexValenceTextureBuffer);
+    glDeleteTextures(1, &quadOffsetTextureBuffer);
+    glDeleteTextures(1, &patchLevelTextureBuffer);
+    glDeleteTextures(1, &ptexCoordinateTextureBuffer);
+    glDeleteTextures(1, &fvarDataTextureBuffer);
 }
 
 bool
@@ -120,6 +123,34 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
         glBufferData(GL_ELEMENT_ARRAY_BUFFER,
                      numIndices * sizeof(unsigned int), &(indices[0]), GL_STATIC_DRAW);
 
+#if defined(GL_ES_VERSION_2_0)
+        // OpenGLES 2 supports only triangle topologies for filled
+        // primitives i.e. not QUADS or PATCHES or LINES_ADJACENCY
+        // For the convenience of clients build build a triangles
+        // index buffer by splitting quads.
+        int numQuads = indices.size() / 4;
+        int numTrisIndices = numQuads * 6;
+
+        std::vector<short> trisIndices;
+        trisIndices.reserve(numTrisIndices);
+        for (int i=0; i<numQuads; ++i) {
+            const int * quad = &indices[i*4];
+            trisIndices.push_back(short(quad[0]));
+            trisIndices.push_back(short(quad[1]));
+            trisIndices.push_back(short(quad[2]));
+
+            trisIndices.push_back(short(quad[2]));
+            trisIndices.push_back(short(quad[3]));
+            trisIndices.push_back(short(quad[0]));
+        }
+
+        // Allocate and fill triangles index buffer.
+        glGenBuffers(1, &patchTrianglesIndexBuffer);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, patchTrianglesIndexBuffer);
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER,
+                     numTrisIndices * sizeof(short), &(trisIndices[0]), GL_STATIC_DRAW);
+#endif
+
         OsdPatchArray array;
         array.desc.type = kNonPatch;
         array.patchSize = loop ? 3 : 4;
@@ -130,6 +161,7 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
 
         // Allocate ptex coordinate buffer if requested (for non-adaptive)
         if (requirePtexCoordinates) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
             GLuint ptexCoordinateBuffer = 0;
             glGenTextures(1, &ptexCoordinateTextureBuffer);
             glGenBuffers(1, &ptexCoordinateBuffer);
@@ -145,10 +177,12 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
             glTexBuffer(GL_TEXTURE_BUFFER, GL_RG32I, ptexCoordinateBuffer);
             glDeleteBuffers(1, &ptexCoordinateBuffer);
             glBindTexture(GL_TEXTURE_BUFFER, 0);
+#endif
         }
 
         // Allocate fvar data buffer if requested (for non-adaptive)
         if (requireFVarData) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
             GLuint fvarDataBuffer = 0;
             glGenTextures(1, &fvarDataTextureBuffer);
             glGenBuffers(1, &fvarDataBuffer);
@@ -163,6 +197,7 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
             glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, fvarDataBuffer);
             glDeleteBuffers(1, &fvarDataBuffer);
             glBindTexture(GL_TEXTURE_BUFFER, 0);
+#endif
         }
 
         return true;
@@ -210,30 +245,36 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
     glBufferData(GL_ELEMENT_ARRAY_BUFFER,
         totalPatchIndices * sizeof(unsigned int), NULL, GL_STATIC_DRAW);
 
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
     GLuint patchLevelBuffer = 0;
     glGenBuffers(1, &patchLevelBuffer);
     glBindBuffer(GL_TEXTURE_BUFFER, patchLevelBuffer);
     glBufferData(GL_TEXTURE_BUFFER,
         totalPatchLevels * sizeof(unsigned char), NULL, GL_STATIC_DRAW);
+#endif
 
     // Allocate ptex coordinate buffer if requested
     GLuint ptexCoordinateBuffer = 0;
     if (requirePtexCoordinates) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
         glGenTextures(1, &ptexCoordinateTextureBuffer);
         glGenBuffers(1, &ptexCoordinateBuffer);
         glBindBuffer(GL_ARRAY_BUFFER, ptexCoordinateBuffer);
         glBufferData(GL_ARRAY_BUFFER,
             totalPatchLevels * sizeof(int) * 2, NULL, GL_STATIC_DRAW);
+#endif
     }
 
     // Allocate fvar data buffer if requested
     GLuint fvarDataBuffer = 0;
     if (requireFVarData) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
         glGenTextures(1, &fvarDataTextureBuffer);
         glGenBuffers(1, &fvarDataBuffer);
         glBindBuffer(GL_UNIFORM_BUFFER, fvarDataBuffer);
         glBufferData(GL_UNIFORM_BUFFER,
             totalPatchLevels * sizeof(float) * farMesh->GetTotalFVarWidth()*4, NULL, GL_STATIC_DRAW);
+#endif
     }
 
     int indexBase = 0;
@@ -305,6 +346,7 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
         }
     }
 
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
     // finalize level texture buffer
     glGenTextures(1, &patchLevelTextureBuffer);
     glBindTexture(GL_TEXTURE_BUFFER, patchLevelTextureBuffer);
@@ -325,15 +367,19 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
         glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, fvarDataBuffer);
         glDeleteBuffers(1, &fvarDataBuffer);
     }
+#endif
 
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
     glBindBuffer(GL_TEXTURE_BUFFER, 0);
+#endif
 
     // allocate and initialize additional buffer data
     FarPatchTables::VertexValenceTable const &
         valenceTable = patchTables->GetVertexValenceTable();
 
     if (not valenceTable.empty()) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
         GLuint buffer = 0;
         glGenBuffers(1, &buffer);
         glBindBuffer(GL_TEXTURE_BUFFER, buffer);
@@ -351,12 +397,14 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
         glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, vbo);
 
         glBindBuffer(GL_TEXTURE_BUFFER, 0);
+#endif
     }
 
     FarPatchTables::QuadOffsetTable const &
         quadOffsetTable = patchTables->GetQuadOffsetTable();
 
     if (not quadOffsetTable.empty()) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
         GLuint buffer = 0;
         glGenBuffers(1, &buffer);
         glBindBuffer(GL_TEXTURE_BUFFER, buffer);
@@ -370,6 +418,7 @@ OsdGLDrawContext::allocate(FarMesh<OsdVertex> *farMesh,
         glDeleteBuffers(1, &buffer);
 
         glBindBuffer(GL_TEXTURE_BUFFER, 0);
+#endif
     }
 
     return true;
@@ -423,13 +472,16 @@ OsdGLDrawContext::_AppendPatchArray(
         }
     }
 
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
     glBufferSubData(GL_TEXTURE_BUFFER,
                     array.levelBase * sizeof(unsigned char),
                     levels.size() * sizeof(unsigned char),
                     &levels[0]);
     *levelBase += (int)levels.size();
+#endif
 
     if (ptexCoordinateTextureBuffer) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
         assert(ptexTable.size()/2 == levels.size());
 
         // populate ptex coordinates
@@ -437,9 +489,11 @@ OsdGLDrawContext::_AppendPatchArray(
                         array.levelBase * sizeof(int) * 2,
                         (int)ptexTable.size() * sizeof(int),
                         &ptexTable[0]);
+#endif
     }
 
     if (fvarDataTextureBuffer) {
+#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
         assert(fvarTable.size()/(fvarDataWidth*4) == levels.size());
 
         // populate fvar data
@@ -447,6 +501,7 @@ OsdGLDrawContext::_AppendPatchArray(
                         array.levelBase * sizeof(float) * fvarDataWidth*4,
                         (int)fvarTable.size() * sizeof(float),
                         &fvarTable[0]);
+#endif
     }
 }
 

opensubdiv/osd/glDrawContext.h

@@ -51,13 +51,20 @@
 #ifndef OSD_GL_DRAW_CONTEXT_H
 #define OSD_GL_DRAW_CONTEXT_H
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/gl.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../version.h"
@@ -97,6 +104,11 @@ public:
     }
 
     GLuint patchIndexBuffer;
+
+#if defined(GL_ES_VERSION_2_0)
+    GLuint patchTrianglesIndexBuffer;
+#endif
+
     GLuint ptexCoordinateTextureBuffer;
     GLuint fvarDataTextureBuffer;
 

opensubdiv/osd/glDrawRegistry.cpp

@@ -49,10 +49,20 @@
 //     (E) The software is licensed "as-is." You bear the risk of
 //     using it. The contributors give no express warranties,
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
 #else
-    #include <OpenGL/gl3.h>
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/glew.h>
 #endif
 
 #include "../osd/glDrawRegistry.h"
@@ -68,6 +78,7 @@ OsdGLDrawConfig::~OsdGLDrawConfig()
     glDeleteProgram(program);
 }
 
+#if defined(GL_ARB_tessellation_shader) || defined(GL_VERSION_4_0)
 static const char *commonShaderSource =
 #include "glslPatchCommon.inc"
 ;
@@ -89,6 +100,7 @@ static const char *boundaryGregoryShaderSource =
 static const char *transitionShaderSource =
 #include "glslPatchTransition.inc"
 ;
+#endif
 
 OsdGLDrawRegistryBase::~OsdGLDrawRegistryBase() {}
 
@@ -97,6 +109,7 @@ OsdGLDrawRegistryBase::_CreateDrawSourceConfig(OsdPatchDescriptor const & desc)
 {
     OsdGLDrawSourceConfig * sconfig = _NewDrawSourceConfig();
 
+#if defined(GL_ARB_tessellation_shader) || defined(GL_VERSION_4_0)
     sconfig->commonShader.source = commonShaderSource;
     {
         std::ostringstream ss;
@@ -228,6 +241,7 @@ OsdGLDrawRegistryBase::_CreateDrawSourceConfig(OsdPatchDescriptor const & desc)
         sconfig = NULL;
         break;
     }
+#endif
 
     return sconfig;
 }
@@ -307,10 +321,14 @@ OsdGLDrawRegistryBase::_CreateDrawConfig(
                 sconfig->commonShader, sconfig->tessEvalShader);
 #endif
 
-    GLuint geometryShader =
+    GLuint geometryShader = 0;
+
+#if defined(GL_ARB_geometry_shader4) || defined(GL_VERSION_3_1)
+    geometryShader =
         sconfig->geometryShader.source.empty() ? 0 :
         _CompileShader(GL_GEOMETRY_SHADER,
                 sconfig->commonShader, sconfig->geometryShader);
+#endif
 
     GLuint fragmentShader =
         sconfig->fragmentShader.source.empty() ? 0 :

opensubdiv/osd/glDrawRegistry.h

@@ -52,13 +52,20 @@
 #ifndef OSD_GL_DRAW_REGISTRY_H
 #define OSD_GL_DRAW_REGISTRY_H
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/gl.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../version.h"

opensubdiv/osd/glPtexTexture.cpp

@@ -55,10 +55,10 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
-#else
+#if defined(__APPLE__)
     #include <OpenGL/gl3.h>
+#else
+    #include <GL/glew.h>
 #endif
 
 #include "../osd/glPtexTexture.h"

opensubdiv/osd/glPtexTexture.h

@@ -57,13 +57,20 @@
 #ifndef OSD_GL_PTEX_TEXTURE_H
 #define OSD_GL_PTEX_TEXTURE_H
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/gl.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../version.h"

opensubdiv/osd/glVertexBuffer.cpp

@@ -55,10 +55,20 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
 #else
-    #include <OpenGL/gl3.h>
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/glew.h>
 #endif
 
 #include "../osd/glVertexBuffer.h"
@@ -85,7 +95,7 @@ OsdGLVertexBuffer::Create(int numElements, int numVertices) {
         new OsdGLVertexBuffer(numElements, numVertices);
     if (instance->allocate()) return instance;
     delete instance;
-    return NULL;
+    return 0;
 }
 
 void

opensubdiv/osd/glVertexBuffer.h

@@ -57,13 +57,20 @@
 #ifndef OSD_GL_VERTEX_BUFFER_H
 #define OSD_GL_VERTEX_BUFFER_H
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/gl.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../version.h"

opensubdiv/osd/glslComputeContext.cpp

@@ -55,13 +55,20 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/glew.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../osd/debug.h"

opensubdiv/osd/glslComputeContext.h

@@ -57,10 +57,20 @@
 #ifndef OSD_GLSL_COMPUTE_CONTEXT_H
 #define OSD_GLSL_COMPUTE_CONTEXT_H
 
-#if not defined(__APPLE__)
-    #include <GL/gl.h>
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
 #else
-    #include <OpenGL/gl3.h>
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/gl.h>
 #endif
 
 #include "../version.h"

opensubdiv/osd/glslComputeController.cpp

@@ -55,13 +55,20 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/glew.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../osd/glslComputeController.h"

opensubdiv/osd/glslDispatcher.cpp

@@ -55,10 +55,20 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
 #else
-    #include <OpenGL/gl3.h>
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/glew.h>
 #endif
 
 #include "../osd/glslComputeContext.h"

opensubdiv/osd/glslKernelBundle.cpp

@@ -55,10 +55,10 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
-#else
+#if defined(__APPLE__)
     #include <OpenGL/gl3.h>
+#else
+    #include <GL/glew.h>
 #endif
 
 #include <stdio.h>

opensubdiv/osd/glslKernelBundle.h

@@ -58,13 +58,20 @@
 #ifndef OSD_GLSL_COMPUTE_KERNEL_BUNDLE_H
 #define OSD_GLSL_COMPUTE_KERNEL_BUNDLE_H
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/gl.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../version.h"

opensubdiv/osd/glslTransformFeedbackComputeContext.cpp

@@ -55,13 +55,20 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/glew.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../osd/glslTransformFeedbackComputeContext.h"

opensubdiv/osd/glslTransformFeedbackComputeContext.h

@@ -58,10 +58,20 @@
 #ifndef OSD_GLSL_TRANSFORM_FEEDBACK_COMPUTE_CONTEXT_H
 #define OSD_GLSL_TRANSFORM_FEEDBACK_COMPUTE_CONTEXT_H
 
-#if not defined(__APPLE__)
-    #include <GL/gl.h>
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
 #else
-    #include <OpenGL/gl3.h>
+    #if defined(_WIN32)
+        #include <windows.h>
+    #endif
+    #include <GL/gl.h>
 #endif
 
 #include "../version.h"

opensubdiv/osd/glslTransformFeedbackComputeController.cpp

@@ -55,10 +55,10 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
-#else
+#if defined(__APPLE__)
     #include <OpenGL/gl3.h>
+#else
+    #include <GL/glew.h>
 #endif
 
 #include "../osd/glslTransformFeedbackComputeController.h"

opensubdiv/osd/glslTransformFeedbackDispatcher.cpp

@@ -55,10 +55,10 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
-#else
+#if defined(__APPLE__)
     #include <OpenGL/gl3.h>
+#else
+    #include <GL/glew.h>
 #endif
 
 #include "../osd/glslTransformFeedbackDispatcher.h"

opensubdiv/osd/glslTransformFeedbackKernelBundle.cpp

@@ -55,10 +55,10 @@
 //     a particular purpose and non-infringement.
 //
 
-#if not defined(__APPLE__)
-    #include <GL/glew.h>
-#else
+#if defined(__APPLE__)
     #include <OpenGL/gl3.h>
+#else
+    #include <GL/glew.h>
 #endif
 
 #include <stdio.h>

opensubdiv/osd/glslTransformFeedbackKernelBundle.h

@@ -57,13 +57,20 @@
 #ifndef OSD_GLSL_TRANSFORM_FEEDBACK_KERNEL_BUNDLE_H
 #define OSD_GLSL_TRANSFORM_FEEDBACK_KERNEL_BUNDLE_H
 
-#if not defined(__APPLE__)
+#if defined(__APPLE__)
+    #include "TargetConditionals.h"
+    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
+        #include <OpenGLES/ES2/gl.h>
+    #else
+        #include <OpenGL/gl3.h>
+    #endif
+#elif defined(ANDROID)
+    #include <GLES2/gl2.h>
+#else
     #if defined(_WIN32)
         #include <windows.h>
     #endif
     #include <GL/gl.h>
-#else
-    #include <OpenGL/gl3.h>
 #endif
 
 #include "../version.h"

opensubdiv/osd/vertexDescriptor.h

@@ -58,6 +58,7 @@
 #define OSD_CPU_VERTEX_DESCRIPTOR_H
 
 #include "../version.h"
+
 namespace OpenSubdiv {
 namespace OPENSUBDIV_VERSION {