From b3d54ff1603da38c900b3b01c9b3f2522ad07127 Mon Sep 17 00:00:00 2001
From: oxmox <oxmox@noreply.localhost>
Date: Thu, 23 Feb 2023 21:57:17 +0100
Subject: [PATCH] add doomlib which includes doomdef.h to fill out
 dp_doom_event_t structures

Those dp_doom_event_t structs are doom even_t structs...
---
 src/CMakeLists.txt |   2 +-
 src/doomlib.cc     | 140 +++++++++++++++++++++++++++++++++++++++++++++
 src/doomlib.hpp    |  10 ++++
 3 files changed, 151 insertions(+), 1 deletion(-)
 create mode 100644 src/doomlib.cc
 create mode 100644 src/doomlib.hpp

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e8349f4..6739d89 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -27,7 +27,7 @@ target_link_libraries(dp_common
 )
 target_include_directories(dp_common INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
 
-add_executable(doompanning doompanning.cc)
+add_executable(doompanning doompanning.cc doomlib.cc)
 target_compile_features(doompanning PRIVATE cxx_std_17)
 target_link_libraries(doompanning
     PRIVATE dp_common
diff --git a/src/doomlib.cc b/src/doomlib.cc
new file mode 100644
index 0000000..7f9db24
--- /dev/null
+++ b/src/doomlib.cc
@@ -0,0 +1,140 @@
+#include "doomlib.hpp"
+#include "dp_doom/linuxdoom-1.10/doomdef.h"
+
+// Taken from ib_video_sdl.c
+static int xlatekey(SDL_Keycode keysym)
+{
+    int rc;
+
+    switch(rc = keysym)
+    {
+      case SDLK_LEFT:	rc = KEY_LEFTARROW;	break;
+      case SDLK_RIGHT:	rc = KEY_RIGHTARROW;	break;
+      case SDLK_DOWN:	rc = KEY_DOWNARROW;	break;
+      case SDLK_UP:	rc = KEY_UPARROW;	break;
+      case SDLK_ESCAPE:	rc = KEY_ESCAPE;	break;
+      case SDLK_RETURN:	rc = KEY_ENTER;		break;
+      case SDLK_TAB:	rc = KEY_TAB;		break;
+      case SDLK_F1:	rc = KEY_F1;		break;
+      case SDLK_F2:	rc = KEY_F2;		break;
+      case SDLK_F3:	rc = KEY_F3;		break;
+      case SDLK_F4:	rc = KEY_F4;		break;
+      case SDLK_F5:	rc = KEY_F5;		break;
+      case SDLK_F6:	rc = KEY_F6;		break;
+      case SDLK_F7:	rc = KEY_F7;		break;
+      case SDLK_F8:	rc = KEY_F8;		break;
+      case SDLK_F9:	rc = KEY_F9;		break;
+      case SDLK_F10:	rc = KEY_F10;		break;
+      case SDLK_F11:	rc = KEY_F11;		break;
+      case SDLK_F12:	rc = KEY_F12;		break;
+
+      case SDLK_BACKSPACE:
+      case SDLK_DELETE:	rc = KEY_BACKSPACE;	break;
+
+      case SDLK_PAUSE:	rc = KEY_PAUSE;		break;
+
+      case SDLK_KP_EQUALS:
+      case SDLK_EQUALS:	rc = KEY_EQUALS;	break;
+
+      case SDLK_KP_MINUS:
+      case SDLK_MINUS:	rc = KEY_MINUS;		break;
+
+      case SDLK_LSHIFT:
+      case SDLK_RSHIFT:
+	rc = KEY_RSHIFT;
+	break;
+
+      case SDLK_LCTRL:
+      case SDLK_RCTRL:
+	rc = KEY_RCTRL;
+	break;
+
+      case SDLK_LALT:
+      case SDLK_RALT:
+#if SDL_MAJOR_VERSION >= 2
+      case SDLK_LGUI:
+      case SDLK_RGUI:
+#else
+      case SDLK_LMETA:
+      case SDLK_RMETA:
+#endif
+	rc = KEY_RALT;
+	break;
+
+      default:
+	if (rc >= SDLK_SPACE && rc <= SDLK_BACKQUOTE)
+	    rc = rc - SDLK_SPACE + ' ';
+	else if (rc >= 'A' && rc <= 'Z')
+	    rc = rc - 'A' + 'a';
+	break;
+    }
+
+    return rc;
+}
+
+// Similar to IB_StartTic from ib_video_sdl.c
+std::optional<dp_doom_event_t> doomevent_from_sdlevent(const SDL_Event &sdl_event)
+{
+    dp_doom_event_t event;
+    static int button_state;
+
+    switch (sdl_event.type)
+    {
+    case SDL_KEYDOWN:
+        event.type = DP_ev_keydown;
+        event.data1 = xlatekey(sdl_event.key.keysym.sym);
+        return event;
+
+    case SDL_KEYUP:
+        event.type = DP_ev_keyup;
+        event.data1 = xlatekey(sdl_event.key.keysym.sym);
+        return event;
+
+    case SDL_MOUSEBUTTONDOWN:
+        switch (sdl_event.button.button)
+        {
+        case SDL_BUTTON_LEFT:
+            button_state |= 1;
+            break;
+        case SDL_BUTTON_MIDDLE:
+            button_state |= 2;
+            break;
+        case SDL_BUTTON_RIGHT:
+            button_state |= 4;
+            break;
+        }
+        event.type = DP_ev_mouse;
+        event.data1 = button_state;
+        event.data2 = event.data3 = 0;
+        return event;
+
+    case SDL_MOUSEBUTTONUP:
+        switch (sdl_event.button.button)
+        {
+        case SDL_BUTTON_LEFT:
+            button_state &= ~1;
+            break;
+        case SDL_BUTTON_MIDDLE:
+            button_state &= ~2;
+            break;
+        case SDL_BUTTON_RIGHT:
+            button_state &= ~4;
+            break;
+        }
+        event.type = DP_ev_mouse;
+        event.data1 = button_state;
+        event.data2 = event.data3 = 0;
+        return event;
+
+    case SDL_MOUSEMOTION:
+        event.type = DP_ev_mouse;
+        event.data1 = button_state;
+        event.data2 = sdl_event.motion.xrel * (1 << 5);
+        event.data3 = -sdl_event.motion.yrel * (1 << 5);
+
+        if (event.data2 || event.data3)
+            return event;
+    }
+
+    return {};
+}
diff --git a/src/doomlib.hpp b/src/doomlib.hpp
new file mode 100644
index 0000000..53a81c2
--- /dev/null
+++ b/src/doomlib.hpp
@@ -0,0 +1,10 @@
+#ifndef SRC_DOOMLIB_HPP
+#define SRC_DOOMLIB_HPP
+
+#include <optional>
+#include <SDL.h>
+#include "dp_common.h"
+
+std::optional<dp_doom_event_t> doomevent_from_sdlevent(const SDL_Event &sdl_event);
+
+#endif // SRC_DOOMLIB_HPP