ctrl: write some broken sdl and imgui code

CMakeLists.txt

@@ -6,7 +6,7 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 ## Create binaries in the root of the build directory
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
-set(CMAKE_VERBOSE_MAKEFILE ON)
+set(CMAKE_VERBOSE_MAKEFILE ON CACHE BOOL "ON")
 
 add_subdirectory(external)
 add_subdirectory(src)

src/CMakeLists.txt

@@ -6,6 +6,7 @@ target_compile_options(logc INTERFACE "-ffile-prefix-map=${CMAKE_SOURCE_DIR}=."
 
 find_package(Threads)
 
+
 add_library(dp_common dp_common.c)
 target_compile_features(dp_common PRIVATE c_std_11)
 target_compile_options(dp_common PUBLIC "-Wall" "-Wextra")
@@ -15,10 +16,16 @@ target_link_libraries(dp_common
     PUBLIC Threads::Threads
 )
 
+find_package(SDL2 REQUIRED)
+
 add_executable(doompanning doompanning.cc)
 target_compile_features(doompanning PRIVATE cxx_std_17)
+#target_compile_options(doompanning PRIVATE ${IMGUI_CFLAGS})
+#target_include_directories(doompanning PRIVATE ${IMGUI_INCLUDE_DIRS})
 target_link_libraries(doompanning
     PRIVATE dp_common
+    #PRIVATE ${IMGUI_LIBRARIES}
+    PRIVATE SDL2::SDL2-static
     )
 
 add_executable(doomsim doomsim.cc)

src/doompanning.cc

@@ -1,14 +1,36 @@
 #include <cstdlib>
 #include <nng/nng.h>
-#include <sys/types.h>
+
-#include <unistd.h>
+//#include <imgui.h>
+//#include <backends/imgui_impl_sdl.h>
+#include <SDL.h>
+
 #include "dp_common.h"
 #include "log.h"
 
+void dp_sdl_fatal(const char *const msg)
+{
+    log_fatal("%s: %s", SDL_GetError());
+    abort();
+}
+
 static const size_t NumDooms = 3;
 
-int doom_controller_loop(nng_socket pubSock, nng_socket subSock)
+int doom_controller_loop(nng_socket pubSock, nng_socket subSock, SDL_Window *window, SDL_Renderer *renderer)
 {
+    bool done = false;
+
+    while (!done)
+    {
+        SDL_Event event;
+        while (SDL_PollEvent(&event))
+        {
+            if (event.type == SDL_QUIT)
+                done = true;
+            if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
+                done = true;
+        }
+    }
 
     return 0;
 }
@@ -25,7 +47,29 @@ int main(int argc, char *argv[])
     auto pubSock = make_ctrl_pub(CtrlUrl);
     auto subSock = make_ctrl_sub(DoomUrl);
 
-    int ret = doom_controller_loop(pubSock, subSock);
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER))
+        dp_sdl_fatal("SDL_Init");
+
+#ifdef SDL_HINT_IME_SHOW_UI
+    SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
+#endif
+
+    const auto windowFlags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI;
+    auto window = SDL_CreateWindow("doompanning", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, windowFlags);
+    if (!window)
+        dp_sdl_fatal("SDL_CreateWindow");
+
+    auto renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED);
+
+    if (!renderer)
+        dp_sdl_fatal("SDL_CreateRenderer");
+
+    //IMGUI_CHECKVERSION();
+    //ImGui::CreateContext();
+    //ImGui::StyleColorsDark();
+    //ImGui_ImplSDL2_InitForSDLRenderer(window);
+
+    int ret = doom_controller_loop(pubSock, subSock, window, renderer);
 
     nng_close(pubSock);
     nng_close(subSock);

src/doomsim.cc

@@ -102,14 +102,14 @@ DEF_DOOM_STATE_FUNC(do_doom_running)
 {
     assert(ctx->state == DP_DS_Running);
 
-    // Read and handle input messages
+    // Non-blocking receive of incoming messages.
+    // Check if we should quit.
+    // Handle incoming input.
 
     // Let doom render a new frame
 
     // Publish the frame
 
-    // Check if we should quit
-
     return 0;
 }