Add example of using cl_khr_gl_sharing to do gl buffer sharing.

Signed-off-by: Chuanbo Weng <chuanbo.weng@intel.com>
Reviewed-by: Yang Rong <rong.r.yang@intel.com>

2 files changed, 165 insertions, 30 deletions

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 850b3d90..a9e35c24 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -1,44 +1,64 @@
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}
                     ${CMAKE_CURRENT_SOURCE_DIR}/../utests
                     ${CMAKE_CURRENT_SOURCE_DIR}/../include
-                    ${X11_INCLUDE_DIR})
+                    ${X11_INCLUDE_DIR}
+                    ${OPENGL_INCLUDE_DIRS}
+                    ${EGL_INCLUDE_DIRS})
+
+set (ocl_example_helper_sources
+  ../utests/utest_error.c
+  ../utests/utest_assert.cpp
+  ../utests/utest_file_map.cpp
+  ../utests/utest_helper.cpp)
+
+IF(OPENGL_FOUND AND EGL_FOUND AND X11_FOUND)
+  ADD_DEFINITIONS(-DHAS_GL_EGL_X11)
+ENDIF(OPENGL_FOUND AND EGL_FOUND AND X11_FOUND)
+
+SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-deprecated-declarations")
+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-deprecated-declarations" )
+
+ADD_LIBRARY(ocl_example_helper SHARED ${ocl_example_helper_sources})
+
+TARGET_LINK_LIBRARIES(ocl_example_helper cl m ${X11_LIBRARIES} ${OPENGL_LIBRARIES} ${EGL_LIBRARIES})
 
 IF(LIBVA_BUF_SH_DEP OR V4L2_BUF_SH_DEP)
-EXECUTE_PROCESS(COMMAND ls "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva" OUTPUT_VARIABLE LS_RESULT)
-IF ("LS_RESULT" STREQUAL "")
-EXECUTE_PROCESS(COMMAND git submodule init WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/..)
-EXECUTE_PROCESS(COMMAND git submodule update WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/..)
-EXECUTE_PROCESS(COMMAND git checkout master WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva)
-ENDIF ("LS_RESULT" STREQUAL "")
+  EXECUTE_PROCESS(COMMAND ls "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva" OUTPUT_VARIABLE LS_RESULT)
+  IF ("LS_RESULT" STREQUAL "")
+    EXECUTE_PROCESS(COMMAND git submodule init WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/..)
+    EXECUTE_PROCESS(COMMAND git submodule update WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/..)
+    EXECUTE_PROCESS(COMMAND git checkout master WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva)
+  ENDIF ("LS_RESULT" STREQUAL "")
 
-INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva/va
-                    ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva/test/common)
+  INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva/va
+                      ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/libva/test/common)
 
-link_directories (${LIBVA_LIBDIR}
-                  ${LIBVA-X11_LIBDIR})
+  link_directories (${LIBVA_LIBDIR}
+                    ${LIBVA-X11_LIBDIR})
 
-set (va_ocl_basic_sources
-  ../utests/utest_error.c
-  ../utests/utest_assert.cpp
-  ../utests/utest_file_map.cpp
-  ../utests/utest_helper.cpp
-  ./thirdparty/libva/test/common/va_display.c
-  ./thirdparty/libva/test/common/va_display_x11.c)
+  set (va_display_sources
+    ./thirdparty/libva/test/common/va_display.c
+    ./thirdparty/libva/test/common/va_display_x11.c)
 
-ADD_DEFINITIONS(-DHAVE_VA_X11)
+  ADD_DEFINITIONS(-DHAVE_VA_X11)
 
-ADD_LIBRARY(va_ocl_basic SHARED ${va_ocl_basic_sources})
+  ADD_LIBRARY(va_display SHARED ${va_display_sources})
 
-TARGET_LINK_LIBRARIES(va_ocl_basic cl m va va-x11 ${X11_X11_LIB})
+  TARGET_LINK_LIBRARIES(va_display cl m va va-x11 ${X11_LIBRARIES})
 
-IF(LIBVA_BUF_SH_DEP)
-ADD_DEFINITIONS(-DINPUT_NV12_DEFAULT="${CMAKE_CURRENT_SOURCE_DIR}/libva_buffer_sharing/256_128.nv12")
-ADD_EXECUTABLE(example-libva_buffer_sharing ./libva_buffer_sharing/libva_buffer_sharing.cpp)
-TARGET_LINK_LIBRARIES(example-libva_buffer_sharing va_ocl_basic)
-ENDIF(LIBVA_BUF_SH_DEP)
+  IF(LIBVA_BUF_SH_DEP)
+    ADD_DEFINITIONS(-DINPUT_NV12_DEFAULT="${CMAKE_CURRENT_SOURCE_DIR}/libva_buffer_sharing/256_128.nv12")
+    ADD_EXECUTABLE(example-libva_buffer_sharing ./libva_buffer_sharing/libva_buffer_sharing.cpp)
+    TARGET_LINK_LIBRARIES(example-libva_buffer_sharing ocl_example_helper va_display)
+  ENDIF(LIBVA_BUF_SH_DEP)
 
-IF(V4L2_BUF_SH_DEP)
-ADD_EXECUTABLE(example-v4l2_buffer_sharing ./v4l2_buffer_sharing/v4l2_buffer_sharing.cpp)
-TARGET_LINK_LIBRARIES(example-v4l2_buffer_sharing va_ocl_basic)
-ENDIF(V4L2_BUF_SH_DEP)
+  IF(V4L2_BUF_SH_DEP)
+    ADD_EXECUTABLE(example-v4l2_buffer_sharing ./v4l2_buffer_sharing/v4l2_buffer_sharing.cpp)
+    TARGET_LINK_LIBRARIES(example-v4l2_buffer_sharing ocl_example_helper va_display)
+  ENDIF(V4L2_BUF_SH_DEP)
 ENDIF(LIBVA_BUF_SH_DEP OR V4L2_BUF_SH_DEP)
+
+IF(OPENGL_FOUND AND EGL_FOUND AND X11_FOUND)
+  ADD_EXECUTABLE(example-gl_buffer_sharing ./gl_buffer_sharing/gl_buffer_sharing.cpp)
+  TARGET_LINK_LIBRARIES(example-gl_buffer_sharing ocl_example_helper ${OPENGL_LIBRARIES} ${EGL_LIBRARIES})
+ENDIF(OPENGL_FOUND AND EGL_FOUND AND X11_FOUND)
diff --git a/examples/gl_buffer_sharing/gl_buffer_sharing.cpp b/examples/gl_buffer_sharing/gl_buffer_sharing.cpp
new file mode 100644
index 00000000..2d7e10d4
--- /dev/null
+++ b/examples/gl_buffer_sharing/gl_buffer_sharing.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "utest_helper.hpp"
+#include <stdio.h>
+
+static cl_int cl_status;
+
+const size_t w = EGL_WINDOW_WIDTH;
+const size_t h = EGL_WINDOW_HEIGHT;
+static GLuint tex;
+
+static void draw(){
+  XEvent event;
+
+  float vertices[8] = {-1, 1, 1, 1, 1, -1, -1, -1};
+  float tex_coords[8] = {0, 0, 1, 0, 1, 1, 0, 1};
+  uint32_t color0 = 0x0000ff00;
+
+  for (;;)
+  {
+    XNextEvent(xDisplay, &event);
+
+    if (event.type == Expose)
+    {
+      glClearColor(0.0, 1.0, 0.0, 1.0);
+      glClear(GL_COLOR_BUFFER_BIT);
+
+      OCL_SET_ARG(0, sizeof(cl_mem), &buf[0]);
+      OCL_SET_ARG(1, sizeof(color0), &color0);
+      globals[0] = w;
+      globals[1] = h;
+      locals[0] = 16;
+      locals[1] = 16;
+      glFinish();
+      OCL_ENQUEUE_ACQUIRE_GL_OBJECTS(0);
+      OCL_NDRANGE(2);
+      OCL_ENQUEUE_RELEASE_GL_OBJECTS(0);
+      OCL_FINISH();
+
+      glBindTexture(GL_TEXTURE_2D, tex);
+      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_MAG_FILTER, GL_NEAREST);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glEnable(GL_TEXTURE_2D);
+      glDisable(GL_BLEND);
+      glVertexPointer(2, GL_FLOAT, sizeof(float) * 2, vertices);
+      glEnableClientState(GL_VERTEX_ARRAY);
+      glClientActiveTexture(GL_TEXTURE0);
+      glTexCoordPointer(2, GL_FLOAT, sizeof(float) * 2, tex_coords);
+      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+      glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+      glFinish();
+      eglSwapBuffers(eglDisplay, eglSurface);
+    }
+    if (event.type == KeyPress)
+      break;
+  }
+}
+
+
+static void initialize_ocl_gl(){
+
+  //ocl initialization: basic & create kernel & check extension
+  printf("\n***********************OpenCL info: ***********************\n");
+  if ((cl_status = cl_test_init("runtime_fill_gl_image.cl", "runtime_fill_gl_image", SOURCE)) != 0){
+    fprintf(stderr, "cl_test_init error\n");
+    exit(1);
+  }
+
+  if (eglContext == EGL_NO_CONTEXT) {
+    fprintf(stderr, "There is no valid egl context! Exit!\n");
+    exit(1);
+  }
+
+  XMapWindow(xDisplay, xWindow);
+
+  // Setup kernel and images
+  glGenTextures(1, &tex);
+  glBindTexture(GL_TEXTURE_2D, tex);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, NULL);
+
+  //Create cl image from miplevel 0
+  OCL_CREATE_GL_IMAGE(buf[0], 0, GL_TEXTURE_2D, 0, tex);
+}
+
+int main(int argc, char *argv[])
+{
+  initialize_ocl_gl();
+
+  draw();
+
+  //destroy resource of cl & gl
+  cl_test_destroy();
+
+  printf("\nExample run successfully!\n");
+}