Add gles version of the viewer

KhronosGroup · Jan 12, 2023 · 6991cbf · 6991cbf
1 parent 2351bd8
commit 6991cbf
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Showing 12 changed files with 8,658 additions and 7,700 deletions.
diff --git a/examples/viewer/CMakeLists.txt b/examples/viewer/CMakeLists.txt
@@ -25,11 +25,39 @@ target_link_libraries(${PROJECT_NAME} PRIVATE
   anari
   anari_test_scenes
   stb_image
-  glad
+  glad_gl
 )
 
 install(TARGETS ${PROJECT_NAME}
   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
 )
+
+option(BUILD_GLES_VIEWER "Build GLES version of the viewer" OFF)
+if (BUILD_GLES_VIEWER)
+
+  add_executable(${PROJECT_NAME}_gles2
+    MainWindow.cpp
+    main.cpp
+    OrbitManipulator.cpp
+  )
+
+  target_compile_definitions(${PROJECT_NAME}_gles2 PRIVATE GLM_ENABLE_EXPERIMENTAL)
+  target_compile_definitions(${PROJECT_NAME}_gles2 PRIVATE USE_GLES2)
+
+  target_link_libraries(${PROJECT_NAME}_gles2 PRIVATE
+    imgui_glfw_gles2
+    anari
+    anari_test_scenes
+    stb_image
+    glad_gles2
+  )
+
+  install(TARGETS ${PROJECT_NAME}_gles2
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  )
+
+endif()
diff --git a/examples/viewer/MainWindow.cpp b/examples/viewer/MainWindow.cpp
@@ -160,6 +160,12 @@ MainWindow::MainWindow(const glm::uvec2 &windowSize)
   // Request a window that is IEC standard RGB color space capable
   glfwWindowHint(GLFW_SRGB_CAPABLE, GLFW_TRUE);
 
+#ifdef USE_GLES2
+  glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
+  glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+#endif
+
   // create GLFW window
   g_window = glfwCreateWindow(windowSize.x,
       windowSize.y,
@@ -176,10 +182,17 @@ MainWindow::MainWindow(const glm::uvec2 &windowSize)
   glfwMakeContextCurrent(g_window);
 
   // Setup for OpenGL graphics library rendering
-  if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
+#ifdef USE_GLES2
+  if (!gladLoadGLES2((GLADloadfunc)glfwGetProcAddress)) {
+    glfwTerminate();
+    throw std::runtime_error("Failed to load GLES!");
+  }
+#else
+  if (!gladLoadGL((GLADloadfunc)glfwGetProcAddress)) {
     glfwTerminate();
     throw std::runtime_error("Failed to load GL!");
   }
+#endif
 
   // Create a texture
   glGenTextures(1, &framebufferTexture);

diff --git a/examples/viewer/MainWindow.h b/examples/viewer/MainWindow.h
@@ -6,8 +6,13 @@
 #include "OrbitManipulator.h"
 #include "glm_box3.h"
 // glad header
-#include "glad/glad.h"
+#ifdef USE_GLES2
+#include "glad/gles2.h"
+#else
+#include "glad/gl.h"
+#endif
 // glfw header
+#define GLFW_INCLUDE_NONE
 #include "GLFW/glfw3.h"
 // ANARI headers
 #include "anari/anari_cpp.hpp"

diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
@@ -38,7 +38,7 @@ set(OpenGL_GL_PREFERENCE "LEGACY")
 find_package(OpenGL 4 REQUIRED)
 find_package(glfw3 REQUIRED)
 
-add_library(imgui_glfw OBJECT
+set(IMGUI_SOURCES
   ${imgui_src_LOCATION}/imgui.cpp
   ${imgui_src_LOCATION}/imgui_draw.cpp
   ${imgui_src_LOCATION}/imgui_demo.cpp
@@ -51,12 +51,30 @@ add_library(imgui_glfw OBJECT
   ${imgui_src_LOCATION}/misc/cpp/imgui_stdlib.cpp
 )
 
-target_link_libraries(imgui_glfw PUBLIC glfw OpenGL::GL glad)
-target_compile_definitions(imgui_glfw PUBLIC IMGUI_IMPL_OPENGL_LOADER_GLAD)
+add_library(imgui_glfw OBJECT
+  ${IMGUI_SOURCES}
+)
+
+target_link_libraries(imgui_glfw PUBLIC glfw OpenGL::GL glad_gl)
+target_compile_definitions(imgui_glfw PUBLIC IMGUI_IMPL_OPENGL_LOADER_GLAD2)
 
 target_include_directories(imgui_glfw
 PUBLIC
   ${imgui_src_LOCATION}
   ${imgui_src_LOCATION}/backends
   ${imgui_src_LOCATION}/misc/cpp
 )
+
+add_library(imgui_glfw_gles2 OBJECT
+  ${IMGUI_SOURCES}
+)
+
+target_link_libraries(imgui_glfw_gles2 PUBLIC glfw OpenGL::GL glad_gles2)
+target_compile_definitions(imgui_glfw_gles2 PUBLIC IMGUI_IMPL_OPENGL_LOADER_GLAD2 IMGUI_IMPL_OPENGL_ES3)
+
+target_include_directories(imgui_glfw_gles2
+PUBLIC
+  ${imgui_src_LOCATION}
+  ${imgui_src_LOCATION}/backends
+  ${imgui_src_LOCATION}/misc/cpp
+)
diff --git a/external/glad/CMakeLists.txt b/external/glad/CMakeLists.txt
@@ -1,5 +1,7 @@
 ## Copyright 2021 The Khronos Group
 ## SPDX-License-Identifier: Apache-2.0
 
-add_library(glad STATIC glad.c)
-target_include_directories(glad PUBLIC ${CMAKE_CURRENT_LIST_DIR})
+add_library(glad_gl STATIC src/gl.c)
+add_library(glad_gles2 STATIC src/gles2.c)
+target_include_directories(glad_gl PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include)
+target_include_directories(glad_gles2 PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include)