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Examples: OpenGL2: Added (yet another) comment/instruction against using opengl2 with modern OpenGL. (#2297)

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This commit is contained in:
omar 2019-01-20 18:10:52 +01:00
parent 2c38b32db1
commit 259f3c78a2
2 changed files with 15 additions and 2 deletions
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8
examples/example_glfw_opengl2/main.cpp
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@ -129,8 +129,14 @@ int main(int, char**)
glViewport(0, 0, display_w, display_h); glViewport(0, 0, display_w, display_h);
glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w); glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound, but prefer using the GL3+ code.
// If you are using this code with non-legacy OpenGL header/contexts (which you should not, prefer using imgui_impl_opengl3.cpp!!),
// you may need to backup/reset/restore current shader using the commented lines below.
//GLint last_program;
//glGetIntegerv(GL_CURRENT_PROGRAM, &last_program);
//glUseProgram(0);
ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData()); ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
//glUseProgram(last_program);
glfwMakeContextCurrent(window); glfwMakeContextCurrent(window);
glfwSwapBuffers(window); glfwSwapBuffers(window);

9
examples/imgui_impl_opengl2.cpp
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@ -102,7 +102,14 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
glEnableClientState(GL_COLOR_ARRAY); glEnableClientState(GL_COLOR_ARRAY);
glEnable(GL_TEXTURE_2D); glEnable(GL_TEXTURE_2D);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
// If you are using this code with non-legacy OpenGL header/contexts (which you should not, prefer using imgui_impl_opengl3.cpp!!),
// you may need to backup/reset/restore current shader using the lines below. DO NOT MODIFY THIS FILE! Add the code in your calling function:
// GLint last_program;
// glGetIntegerv(GL_CURRENT_PROGRAM, &last_program);
// glUseProgram(0);
// ImGui_ImplOpenGL2_RenderDrawData(...);
// glUseProgram(last_program)
// Setup viewport, orthographic projection matrix // Setup viewport, orthographic projection matrix
// Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayMin is typically (0,0) for single viewport apps. // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayMin is typically (0,0) for single viewport apps.