fill out some of the doom implementation

src/dp_doom/CMakeLists.txt

@@ -214,8 +214,8 @@ elseif(BACKEND STREQUAL "SDL2")
 elseif(BACKEND STREQUAL "nng")
 	target_sources(dp_doom PRIVATE
 		"linuxdoom-1.10/ib_sound/sdl.c"
-		"linuxdoom-1.10/ib_system/nng.c"
-		"linuxdoom-1.10/ib_video/nng.c"
+		"linuxdoom-1.10/ib_system/ib_system_nng.c"
+		"linuxdoom-1.10/ib_video/ib_video_nng.c"
 	)
 
 	find_package(SDL2 REQUIRED)

src/dp_doom/linuxdoom-1.10/ib_system/ib_system_nng.c

@@ -20,7 +20,7 @@ int  IB_GetTime (void)
 //
 void IB_Init (void)
 {
-    SDL_Init(0);
+    SDL_Init(SDL_INIT_TIMER);
 }
 
 

src/dp_doom/linuxdoom-1.10/ib_video/ib_video_nng.c

@@ -22,7 +22,9 @@
 //
 //-----------------------------------------------------------------------------
 
+#include <signal.h>
 #include <stddef.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -36,6 +38,12 @@
 
 #include "../ib_video.h"
 
+#define BYTES_PER_PIXEL 3
+
+//uint8_t frameBuffer[SCREENWIDTH * SCREENHEIGHT * BYTES_PER_PIXEL];
+static uint8_t *g_frameBuffer;
+static size_t g_pitch;
+
 //
 // IB_StartTic
 //
@@ -45,6 +53,8 @@ void IB_StartTic (void)
 
 void IB_GetFramebuffer(unsigned char **pixels, size_t *pitch)
 {
+    *pixels = g_frameBuffer;
+    *pitch = g_pitch;
 }
 
 void IB_FinishUpdate (void)
@@ -53,16 +63,34 @@ void IB_FinishUpdate (void)
 
 void IB_GetColor(unsigned char *bytes, unsigned char red, unsigned char green, unsigned char blue)
 {
+    bytes[0] = red;
+    bytes[1] = green;
+    bytes[2] = blue;
+}
+
+static void I_Quit_Wrapper(int dummy)
+{
+    (void)dummy;
+
+    I_Quit();
 }
 
 void IB_InitGraphics(const char *title, size_t screen_width, size_t screen_height, size_t *bytes_per_pixel)
 {
+    (void) title;
+    g_frameBuffer = malloc(screen_width * screen_height * BYTES_PER_PIXEL);
+    g_pitch = screen_width * BYTES_PER_PIXEL;
+    *bytes_per_pixel = BYTES_PER_PIXEL;
+
+    signal(SIGINT, I_Quit_Wrapper);
 }
 
 void IB_ShutdownGraphics(void)
 {
+    free(g_frameBuffer);
 }
 
 void IB_GrabMouse(boolean grab)
 {
+    (void) grab;
 }