From b0a8886780d598f760c5bf156b3ec3cf13006d13 Mon Sep 17 00:00:00 2001
From: archibate <17721388340@163.com>
Date: Thu, 27 Feb 2020 22:03:30 +0800
Subject: [PATCH] initialize_opengl in materialize_layout

fix typo
---
 taichi/backends/codegen_opengl.cpp    |  6 ---
 taichi/platform/opengl/opengl_api.cpp | 66 +++++++++++++--------------
 taichi/platform/opengl/opengl_api.h   |  1 +
 taichi/program.cpp                    |  1 +
 4 files changed, 34 insertions(+), 40 deletions(-)

diff --git a/taichi/backends/codegen_opengl.cpp b/taichi/backends/codegen_opengl.cpp
index 03a9af7c93890..ae8579695edc6 100644
--- a/taichi/backends/codegen_opengl.cpp
+++ b/taichi/backends/codegen_opengl.cpp
@@ -507,12 +507,6 @@ FunctionType OpenglCodeGen::gen(void)
 
 FunctionType OpenglCodeGen::compile(Program &program, Kernel &kernel)
 {
-  static bool warned;
-  if (!warned) {
-    TI_WARN("OpenGL backend currently WIP, MAY NOT WORK");
-    warned = true;
-  }
-
   this->prog_ = &program;
   this->kernel_ = &kernel;
 
diff --git a/taichi/platform/opengl/opengl_api.cpp b/taichi/platform/opengl/opengl_api.cpp
index 68783c1cf3433..12f3f78a0407e 100644
--- a/taichi/platform/opengl/opengl_api.cpp
+++ b/taichi/platform/opengl/opengl_api.cpp
@@ -2,7 +2,6 @@
 
 #ifdef TI_WITH_OPENGL
 
-#define GLEW_STATIC
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #endif
@@ -205,43 +204,42 @@ struct GLSSBO
 
 void initialize_opengl()
 {
-    glfwInit();
-    // Compute Shader requires OpenGL 4.3+ (or OpenGL ES 3.1+)
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
-    // GLEW cannot load GL without a context
-    // And the best way to make context is by creating a window
-    // Then hide it immediately, LOL
-    GLFWwindow *window = glfwCreateWindow(1, 1, "Make GLEW Happy", nullptr, nullptr);
-    if (!window) {
-      const char *desc = nullptr;
-      GLint status = glfwGetError(&desc);
-      if (!desc) desc = "Unknown Error";
-      TI_ERROR("[glsl] cannot create GLFW window: error {}: {}", status, desc);
-    }
-    glfwHideWindow(window);
-    glfwMakeContextCurrent(window);
-    GLint status = glewInit();
-    if (status != GLEW_OK) {
-      TI_ERROR("[glsl] cannot initialize GLEW: {}", glewGetErrorString(status));
-    }
-    const char *gl_version = (const char *)glGetString(GL_VERSION);
-    if (!gl_version) {
-      TI_WARN("[glsl] cannot get OpenGL version");
-    } else {
-      TI_INFO("[glsl] OpenGL {}", gl_version);
-    }
+  static bool gl_inited = false;
+  if (gl_inited)
+    return;
+  TI_WARN("OpenGL backend currently WIP, MAY NOT WORK");
+  gl_inited = true;
+
+  glfwInit();
+  // Compute Shader requires OpenGL 4.3+ (or OpenGL ES 3.1+)
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  // GLEW cannot load GL without a context
+  // And the best way to make context is by creating a window
+  // Then hide it immediately, LOL
+  GLFWwindow *window = glfwCreateWindow(1, 1, "Make GLEW Happy", nullptr, nullptr);
+  if (!window) {
+    const char *desc = nullptr;
+    GLint status = glfwGetError(&desc);
+    if (!desc) desc = "Unknown Error";
+    TI_ERROR("[glsl] cannot create GLFW window: error {}: {}", status, desc);
+  }
+  glfwHideWindow(window);
+  glfwMakeContextCurrent(window);
+  GLint status = glewInit();
+  if (status != GLEW_OK) {
+    TI_ERROR("[glsl] cannot initialize GLEW: {}", glewGetErrorString(status));
+  }
+  const char *gl_version = (const char *)glGetString(GL_VERSION);
+  if (!gl_version) {
+    TI_WARN("[glsl] cannot get OpenGL version");
+  } else {
+    TI_INFO("[glsl] OpenGL {}", gl_version);
+  }
 }
 
 void launch_glsl_kernel(std::string source, std::vector<IOV> iov)
 {
-  static bool gl_inited = false;
-  if (!gl_inited) {
-    // TODO: move this to somewhere like main()
-    initialize_opengl();
-    gl_inited = true;
-  }
-
   GLShader shader(source);
   GLProgram program(shader);
   program.link();
diff --git a/taichi/platform/opengl/opengl_api.h b/taichi/platform/opengl/opengl_api.h
index 665589c556118..0eb23347fc3bb 100644
--- a/taichi/platform/opengl/opengl_api.h
+++ b/taichi/platform/opengl/opengl_api.h
@@ -12,6 +12,7 @@ TLANG_NAMESPACE_BEGIN
 
 namespace opengl {
 
+void initialize_opengl();
 bool is_opengl_api_available();
 void launch_glsl_kernel(std::string source, std::vector<IOV> iov);
 
diff --git a/taichi/program.cpp b/taichi/program.cpp
index a1966765c0875..f1dce2960855c 100644
--- a/taichi/program.cpp
+++ b/taichi/program.cpp
@@ -221,6 +221,7 @@ void Program::materialize_layout() {
     opengl::OpenglStructCompiler scomp;
     opengl_struct_compiled_ = scomp.run(*snode_root);
     TI_INFO("OpenGL root buffer size: {} B", opengl_struct_compiled_->root_size);
+    opengl::initialize_opengl();
   }
 }