add time based vector and DRM support

Kconfig

@@ -55,6 +55,14 @@ config TIME_BASED_VECTOR_LENGHT
 	  For example if set to 2 minutes the line will end where the plane be in 2 minutes,
 	  if direction and speed does not change.
 
+config VECTOR_FOLLOW_TRACK_RATE
+	bool "Time based vector follows change of track"
+	default 1
+	help
+	  Make Time based vector follows change of track of aircraft.
+	  This option will turn the vector from line into curve.
+	  This is of course be more computationaly expensive.
+
 comment "Receiver configuration"
 
 config FALLBACK_LAT
@@ -76,3 +84,70 @@ config METRIC
 	default y
 	help
 	  Show altitudes in meters instead of feet.
+
+comment "Platform dependent options"
+
+choice
+	prompt "Build target"
+	default BUILD_LINUX
+	help
+	  Select platform you want p-rad to be compiled for.
+
+config BUILD_LINUX
+	bool "Linux"
+
+config BUILD_PICO
+	bool "PI pico W"
+
+config BUILD_OTHER_UNIX
+	bool "Other Unix/Posix compatable system (NOT IMPLEMENTED)"
+endchoice
+
+
+
+if BUILD_LINUX
+
+
+choice 
+	prompt "SDL render target"
+	default SDL_TARGET_WINDOW
+	help
+	  Select where you want SDL3 to render to.
+
+config SDL_TARGET_WINDOW
+	bool "Full-Screen Window"
+	help 
+	  Render to Full-Screen Window using window system like X11 or wayland.
+
+config SDL_TARGET_KMSDRM
+	bool "Direct to DRM"
+	help
+	  Render directly to GPU using kmsdrm
+endchoice
+
+
+
+endif
+
+if BUILD_LINUX || BUILD_OTHER_UNIX
+
+config SDL_DRIVERS
+	string "Enabled SDL3 render drivers"
+	default "gpu,vulkan,opengl"
+	help
+	  Comma-speparated list of drivers,
+	  SDL will try each name, in the order listed, until one succeeds or all of them fail.
+	  leave empty and SDL will attempt to choose the best option for you,
+	  based on what is available on the your system.
+	  (I dont recommend leaving this option empty.)
+	  Available drivers can be listed by running this code:
+	  #include <SDL3/SDL.h>
+	  int main() {
+          	SDL_Init(SDL_INIT_VIDEO);
+		SDL_Log("Available renderer drivers:");
+		for (int i = 0; i < SDL_GetNumRenderDrivers(); i++) {
+    			SDL_Log("%d. %s", i + 1, SDL_GetRenderDriver(i));
+		}
+	  }
+
+endif

src/core/units.hpp

@@ -3,3 +3,7 @@ template<typename T>
 static inline T feet_to_meters(T ft) {
         return static_cast<T>(ft * 0.3048);
 }
+template<typename T>
+static inline T knot_to_km(T kn) {
+        return static_cast<T>(kn * 0.5399568);
+}

src/hal/draw.hpp

@@ -19,4 +19,5 @@ struct rect_t {
         void filled_rect(const rect_t* rect, const color_t color);
         void circle(const uint16_t x_center, const uint16_t y_center,const uint16_t radius, const color_t color);
         void rhombus(const uint16_t x_center, const uint16_t y_center,const uint16_t radius, const color_t color);
+        void line(const uint16_t x1,const uint16_t y1,const uint16_t x2,const uint16_t y2, const color_t color);
 }

src/hal/hal_linux.cpp

@@ -1,6 +1,8 @@
 #include "../core/const.hpp"
 #include <SDL3/SDL.h>
 #include <SDL3/SDL_events.h>
+#include <SDL3/SDL_hints.h>
+#include <SDL3/SDL_init.h>
 #include <SDL3/SDL_iostream.h>
 #include <SDL3/SDL_mouse.h>
 #include <SDL3/SDL_rect.h>
@@ -14,6 +16,8 @@
 #include <cstddef>
 #include <cstdint>
 
+#include "../core/color.h"
+#include "core/config.hpp"
 #include "draw.hpp"
 #include "hal/hal.hpp"
 #include <curl/curl.h>
@@ -22,7 +26,7 @@
 #include <nlohmann/json.hpp>
 #include <nlohmann/json_fwd.hpp>
 #include <tuple>
-#include "../core/color.h"
+
 struct sdl_session {
   SDL_Window *window;
   SDL_Renderer *renderer;
@@ -34,16 +38,53 @@ CURL *curl;
 
 namespace hal {
 int init() {
-  SDL_Init(SDL_INIT_VIDEO);
+#ifdef CONFIG_SDL_TARGET_KMSDRM
+  if (!SDL_SetHint(SDL_HINT_KMSDRM_DEVICE_INDEX, "-1")) {
+    SDL_Log("hint failed: %s", SDL_GetError());
+  }
+
+  if (!SDL_SetHint(SDL_HINT_KMSDRM_REQUIRE_DRM_MASTER, "1")) {
+    SDL_Log("hint failed: %s", SDL_GetError());
+  }
+  if (!SDL_SetHint(SDL_HINT_VIDEO_DRIVER, "kmsdrm")) {
+    SDL_Log("hint failed: %s", SDL_GetError());
+  }
+  if (!SDL_SetHint(SDL_HINT_RENDER_DRIVER, CONFIG_SDL_DRIVERS)) {
+    SDL_Log("hint failed: %s", SDL_GetError());
+  }
+#endif
+  if (!SDL_Init(SDL_INIT_VIDEO)) {
+    SDL_Log("init failed: %s", SDL_GetError());
+    return 1;
+  }
+  // DEBUG
+  std::clog << "active driver: " << SDL_GetCurrentVideoDriver() << "\n";
+
   mode = SDL_GetCurrentDisplayMode(SDL_GetPrimaryDisplay());
+  if (!mode) {
+    SDL_Log("failed to get display mode: %s", SDL_GetError());
+    return 1;
+  }
   main_sdl_session.window =
       SDL_CreateWindow(program_name, mode->w, mode->h, SDL_WINDOW_FULLSCREEN);
-  main_sdl_session.renderer =
+  if (!main_sdl_session.window) {
-      SDL_CreateRenderer(main_sdl_session.window, "gpu,vulcan");
+    SDL_Log("window failed: %s", SDL_GetError());
+    return 1;
+  }
+  main_sdl_session.renderer = SDL_CreateRenderer(main_sdl_session.window,
+#ifndef CONFIG_SDL_TARGET_KMSDRM
+                                                 CONFIG_SDL_DRIVERS
+#else
+                                                 NULL
+#endif
+  );
+  if (!main_sdl_session.renderer) {
+    SDL_Log("renderer failed: %s", SDL_GetError());
+    return 1;
+  }
 
   curl = curl_easy_init();
   return 0;
-
 }
 
 std::tuple<uint16_t, uint16_t> get_screen_size() { return {mode->w, mode->h}; }
@@ -56,6 +97,26 @@ void start_frame() {
 
 const Uint64 frame_delay_ns = 1000000000ULL / 1;
 void end_frame() {
+  SDL_Event event;
+  while (SDL_PollEvent(&event)) {
+    switch (event.type) {
+    // Handles Window close (the 'X' button), Alt+F4, or SIGINT (Ctrl+C)
+
+    // Handles keyboard key presses
+    case SDL_EVENT_KEY_DOWN:
+      // Check if the pressed key is 'Q'
+      if (event.key.key != SDLK_Q) {
+        break;
+      }
+
+    case SDL_EVENT_QUIT:
+      SDL_Quit();
+      std::exit(0);
+      break;
+    default:
+      break;
+    }
+  }
 
   SDL_RenderPresent(main_sdl_session.renderer);
 
@@ -83,11 +144,13 @@ void filled_rect(const rect_t *rect, const color_t color) {
   SDL_RenderFillRect(main_sdl_session.renderer, &frect);
 }
 
-void circle(const uint16_t x_center, const uint16_t y_center,const uint16_t radius, const color_t color) {
+void circle(const uint16_t x_center, const uint16_t y_center,
+            const uint16_t radius, const color_t color) {
   SDL_SetRenderDrawColor(main_sdl_session.renderer, color.r, color.g, color.b,
                          0xff);
 
-  // based on https://www.geeksforgeeks.org/dsa/mid-point-circle-drawing-algorithm/
+  // based on
+  // https://www.geeksforgeeks.org/dsa/mid-point-circle-drawing-algorithm/
   int x = radius, y = 0;
 
   // Printing the initial point on the axes
@@ -96,8 +159,7 @@ void circle(const uint16_t x_center, const uint16_t y_center,const uint16_t radi
 
   // When radius is zero only a single
   // point will be printed
-    if (radius > 0)
+  if (radius > 0) {
-    {
     SDL_RenderPoint(main_sdl_session.renderer, x + x_center, -y + y_center);
     SDL_RenderPoint(main_sdl_session.renderer, y + x_center, x + y_center);
     SDL_RenderPoint(main_sdl_session.renderer, -y + x_center, x + y_center);
@@ -106,18 +168,16 @@ void circle(const uint16_t x_center, const uint16_t y_center,const uint16_t radi
 
   // Initialising the value of P
   int P = 1 - radius;
-    while (x > y)
+  while (x > y) {
-    {
     y++;
 
     // Mid-point is inside or on the perimeter
     if (P <= 0)
-            P = P + 2*y + 1;
+      P = P + 2 * y + 1;
     // Mid-point is outside the perimeter
-        else
+    else {
-        {
       x--;
-            P = P + 2*y - 2*x + 1;
+      P = P + 2 * y - 2 * x + 1;
     }
 
     // All the perimeter points have already been printed
@@ -133,8 +193,7 @@ void circle(const uint16_t x_center, const uint16_t y_center,const uint16_t radi
 
     // If the generated point is on the line x = y then
     // the perimeter points have already been printed
-        if (x != y)
+    if (x != y) {
-        {
       SDL_RenderPoint(main_sdl_session.renderer, y + x_center, x + y_center);
       SDL_RenderPoint(main_sdl_session.renderer, -y + x_center, x + y_center);
       SDL_RenderPoint(main_sdl_session.renderer, y + x_center, -x + y_center);
@@ -143,12 +202,25 @@ void circle(const uint16_t x_center, const uint16_t y_center,const uint16_t radi
   }
 }
 
-void rhombus(const uint16_t x_center, const uint16_t y_center,const uint16_t radius, const color_t color) {
+void rhombus(const uint16_t x_center, const uint16_t y_center,
+             const uint16_t radius, const color_t color) {
   SDL_SetRenderDrawColor(main_sdl_session.renderer, color.r, color.g, color.b,
                          0xff);
-  const SDL_FPoint points[] = {{static_cast<float>(x_center+radius),static_cast<float>(y_center)},{static_cast<float>(x_center),static_cast<float>(y_center+radius)},{static_cast<float>(x_center-radius),static_cast<float>(y_center)},{static_cast<float>(x_center),static_cast<float>(y_center-radius)},{static_cast<float>(x_center+radius),static_cast<float>(y_center)}};
+  const SDL_FPoint points[] = {
+      {static_cast<float>(x_center + radius), static_cast<float>(y_center)},
+      {static_cast<float>(x_center), static_cast<float>(y_center + radius)},
+      {static_cast<float>(x_center - radius), static_cast<float>(y_center)},
+      {static_cast<float>(x_center), static_cast<float>(y_center - radius)},
+      {static_cast<float>(x_center + radius), static_cast<float>(y_center)}};
   SDL_RenderLines(main_sdl_session.renderer, points, ARRAY_LENGHT(points));
 }
+
+void line(const uint16_t x1, const uint16_t y1, const uint16_t x2,
+          const uint16_t y2, const color_t color) {
+  SDL_SetRenderDrawColor(main_sdl_session.renderer, color.r, color.g, color.b,
+                         0xff);
+  SDL_RenderLine(main_sdl_session.renderer, x1, y1, x2, y2);
+}
 } // namespace draw
 
 namespace net {

src/hal/hal_pico.cpp

@@ -52,6 +52,8 @@ void filled_rect(const rect_t *rect, const color_t color) {}
 void circle(const uint16_t x_center, const uint16_t y_center,const uint16_t radius, const color_t color) {
   
 }
+void rhombus(const uint16_t x_center, const uint16_t y_center, const uint16_t radius, const color_t color) {}
+void line(const uint16_t x1, const uint16_t y1, const uint16_t x2, const uint16_t y2, const color_t color) {}
 } // namespace draw
 
 namespace net {

src/main.cpp

@@ -8,8 +8,10 @@
 #include "nlohmann/json_fwd.hpp"
 #include <cstdint>
 #include <cstdlib>
+#include <cmath>
 #include <format>
 #include <iostream>
+#include <numbers>
 #include "core/global.hpp"
 #include "core/geo.hpp"
 #include "core/gfx.hpp"
@@ -106,6 +108,18 @@ int main() {
             std::clog << YELLOW"[WARNING]" RESET " aircraft with no alt data detected!\n";
             altitude = 0;
           }
+
+          // aircraft gorund speed in km/h
+          float speed;
+          // aircraft track in degreees
+          float track; 
+          try {
+            speed = knot_to_km(craft["gs"].get<float>());
+            track = craft["track"].get<float>();
+          } catch(...) {
+            std::clog << YELLOW"[WARNING]" RESET " aircraft with no ground speed or track data detected!\n";
+            speed = 0;
+          }
           draw::color_t color= get_altitude_color(altitude);
           try {
           const auto [x_offset,y_offset] = get_offset_from_station(craft["lat"].get<double>(), craft["lon"].get<double>());
@@ -119,7 +133,18 @@ int main() {
           #endif
           const uint16_t x_center = middle_x+((x_offset/1000)*pixels_per_km);
           const uint16_t y_center = middle_y+((y_offset/1000)*pixels_per_km);
-          draw::pixel(x_center, y_center, color);
+          // draw::pixel(x_center, y_center, color);
+
+          //speed in pixels per hour
+          const float speed_pph = speed* pixels_per_km;
+          // lenght of Time-Based Vector
+          const float vector_lenght  = (speed_pph/60) * CONFIG_TIME_BASED_VECTOR_LENGHT;
+
+          // track in radians
+          const float track_rad = std::fmod((track-90),365.0f) * (static_cast<float>(std::numbers::pi)/180.0f);
+
+
+          draw::line(x_center, y_center,x_center + (vector_lenght*std::cos(track_rad)), y_center + (vector_lenght*std::sin(track_rad)), color);
           draw::rhombus(x_center, y_center, 8/*TODO: remove magic*/,color); 
         } catch(...) {
           std::clog << YELLOW"[WARNING]" RESET " aircraft with no lat/lon data detected!\n";