Added partial joystick support for my crappy knock off that swaps things

shaders/post.frag

@@ -70,7 +70,7 @@ void main() {
 
   const mat3 sobely = mat3(-1.0, 0.0, 1.0, -2.0, 0.0, 2.0, -1.0, 0.0, 1.0);
 
-  int time = int(fract(time_padded.x/25.0) * 30.0)/10;
+  int time = int(fract(time_padded.x/1000.0) * 3.0);
   switch(time) {
     case 0:
       out_color = texture(screen, uv);

shaders/ray.frag

@@ -21,8 +21,8 @@ const float EPS_DIST = 1e-6;
 
 float sdf(vec3 point){
   float t = 1.0 + 5.0*abs(sin(time_padded.x));
-  vec3 s1_local = mod(point, vec3(t)) - vec3(t/2.0);
-  float s1 = length(s1_local) - 0.3;
+  vec3 s1_local = point; //mod(point, vec3(t)) - vec3(t/2.0);
+  float s1 = length(s1_local) - t;
   return s1;
 }
 

src/camera.cpp

@@ -1,4 +1,14 @@
 #include "camera.h"
+#include <SDL3/SDL_gamepad.h>
+#include <iostream>
+
+
+/*
+  I bought a very cheap ps4 knockoff controller and for some reason
+  AXIS_RIGHTX and AXIS_RIGHTY are swapped with the triggers?
+  this should be defined as 0 for a working one
+ */ 
+#define WEIRD_JOYSTICK_BEHAVIOR 1
 
 vec3 Camera::dir() const {
   return normalize(vec3(
@@ -50,6 +60,73 @@ void Camera::on_key(SDL_Scancode scancode, bool pressed) {
   }
 }
 
+
+#ifndef WEIRD_JOYSTICK_BEHAVIOR
+#define WEIRD_JOYSTICK_BEHAVIOR 0
+#endif
+static float normalize_stick(SDL_Gamepad* gamepad, SDL_GamepadAxis axis) {
+  if(axis == SDL_GAMEPAD_AXIS_COUNT || axis == SDL_GAMEPAD_AXIS_INVALID)
+    return 0.0f;
+
+
+  float d = static_cast<float>(SDL_GetGamepadAxis(gamepad, axis));
+
+  bool reported_trigger = (axis == SDL_GAMEPAD_AXIS_LEFT_TRIGGER || axis == SDL_GAMEPAD_AXIS_RIGHT_TRIGGER);
+  bool really_trigger = (WEIRD_JOYSTICK_BEHAVIOR)? (axis == SDL_GAMEPAD_AXIS_RIGHTX || axis == SDL_GAMEPAD_AXIS_RIGHTY) : reported_trigger;
+
+  float min = (reported_trigger)? 0 : SDL_JOYSTICK_AXIS_MIN;
+  float max = SDL_JOYSTICK_AXIS_MAX;
+  float n = (d - min) / (max - min);
+
+  return really_trigger? n : ((n - 0.5) * 2.0);
+}
+
+void Camera::on_gamepad(SDL_Gamepad* gamepad) {
+  if (!gamepad) return;
+
+  float lx = normalize_stick(gamepad, SDL_GAMEPAD_AXIS_LEFTX);
+  float ly = normalize_stick(gamepad, SDL_GAMEPAD_AXIS_LEFTY);
+  float ry = normalize_stick(gamepad, (WEIRD_JOYSTICK_BEHAVIOR)? SDL_GAMEPAD_AXIS_RIGHT_TRIGGER : SDL_GAMEPAD_AXIS_RIGHTY);
+  float rx = normalize_stick(gamepad, (WEIRD_JOYSTICK_BEHAVIOR)? SDL_GAMEPAD_AXIS_LEFT_TRIGGER : SDL_GAMEPAD_AXIS_RIGHTX);
+  static uint8_t frame = 0;
+  if(frame++ == 64) {
+    std::cout << "lx: " << lx << " ly: " << ly << " rx: " << rx << " ry: " << ry << std::endl;
+  }
+
+  //float lt = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_LEFT_TRIGGER)  / 32767.0f;
+  //float rt = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_RIGHT_TRIGGER) / 32767.0f;
+
+  const float dead = 0.1f;
+  if (abs(lx) < dead) lx = 0.0f;
+  if (abs(ly) < dead) ly = 0.0f;
+  if (abs(rx) < dead) rx = 0.0f;
+  if (abs(ry) < dead) ry = 0.0f;
+  // if (lt < dead) lt = 0.0f;
+  // if (rt < dead) rt = 0.0f;
+
+  
+  // look — right stick only
+  yaw   += rx * look_speed;
+  pitch -= ry * look_speed;
+  pitch  = clamp(pitch, -89.0f, 89.0f);
+  
+
+  vec3 d     = dir();
+  vec3 right = normalize(cross(d, up));
+  float speed = move_speed * (shifted ? 4.0f : 1.0f);
+
+  // move — left stick
+  pos += d     * (-ly * speed);
+  pos += right * ( lx * speed);
+
+  // up/down — triggers
+  //pos += up * (rt - lt) * speed;
+
+  target = pos + d;
+
+  shifted = SDL_GetGamepadButton(gamepad, SDL_GAMEPAD_BUTTON_LEFT_SHOULDER);
+}
+
 void Camera::on_mouse_motion(float dx, float dy) {
   yaw   += dx * look_speed * 0.1f;
   pitch -= dy * look_speed * 0.1f;
@@ -68,4 +145,4 @@ CameraUBO Camera::ubo(float aspect) const {
     .time      = vec4((float)SDL_GetTicks() / 1000.0f, 0.0, 0.0, 0.0),
     .cam_pos   = vec4(pos, 1.0),
   };
-}
+}

src/camera.h

@@ -28,6 +28,7 @@ struct Camera {
   void update();
   void on_key(SDL_Scancode scancode, bool pressed);
   void on_mouse_motion(float dx, float dy);
+  void on_gamepad(SDL_Gamepad* gamepad);
   CameraUBO ubo(float aspect) const;
 
 private:

src/main.cpp

@@ -1,15 +1,42 @@
+#include <SDL3/SDL_events.h>
+#include <SDL3/SDL_gamepad.h>
 #include <SDL3/SDL_init.h>
 #include <SDL3/SDL_scancode.h>
 #define SDL_MAIN_USE_CALLBACKS
 #include <SDL3/SDL_main.h>
 #include <SDL3/SDL.h>
 
+#include <iostream>
+
 #include "camera.h"
 #include "renderer.h"
 
 static Camera   camera;
 static Renderer renderer;
 
+static SDL_Gamepad* GetGamepad() {
+  int count = 0;
+  SDL_JoystickID* jids = SDL_GetGamepads(&count);
+
+  SDL_Gamepad* gamepad = nullptr;
+  for(int i = 0; i < count; i++) {
+    SDL_Gamepad* candidate_gamepad = SDL_OpenGamepad(jids[i]);
+
+    if(!gamepad) {
+      gamepad = candidate_gamepad;
+    }
+  }
+
+  if(!gamepad) {
+    std::cerr << "No Gamepad :(" << std::endl;
+  } else {    
+    std::cerr << "Selected: " << SDL_GetGamepadName(gamepad) << std::endl;
+  }
+
+  SDL_free(jids);
+  return gamepad;  
+}
+
 SDL_AppResult SDL_AppInit(void** appstate, int argc, char** argv) {
   (void)appstate;
   (void)argc;
@@ -17,14 +44,21 @@ SDL_AppResult SDL_AppInit(void** appstate, int argc, char** argv) {
   SDL_Window* win = SDL_CreateWindow("Kale", 960, 540, SDL_WINDOW_RESIZABLE);
   SDL_SetWindowRelativeMouseMode(win, true);
 
+  SDL_InitSubSystem(SDL_INIT_GAMEPAD);
+
+  SDL_SetGamepadEventsEnabled(true);
+
   if (!renderer.init(win))
     return SDL_APP_FAILURE;
 
+  renderer.gamepad = GetGamepad();
+
   return SDL_APP_CONTINUE;
 }
 
 SDL_AppResult SDL_AppIterate(void* appstate) {
   (void)appstate;
+  camera.on_gamepad(renderer.gamepad);
   camera.update();
 
   uint32_t sw_w = renderer.render_w;
@@ -42,7 +76,16 @@ SDL_AppResult SDL_AppEvent(void* appstate, SDL_Event* event) {
     case SDL_EVENT_WINDOW_CLOSE_REQUESTED:
     case SDL_EVENT_QUIT:
       return SDL_APP_SUCCESS;
-
+    case SDL_EVENT_GAMEPAD_ADDED:
+      if(!renderer.gamepad)
+        renderer.gamepad = SDL_OpenGamepad(event->gdevice.which);
+    break;
+    case SDL_EVENT_GAMEPAD_REMOVED:
+      if (renderer.gamepad && SDL_GetGamepadID(renderer.gamepad) == event->gdevice.which) {
+        SDL_CloseGamepad(renderer.gamepad);
+        renderer.gamepad = nullptr;
+      }
+    break;
     case SDL_EVENT_KEY_DOWN:
     case SDL_EVENT_KEY_UP:
       if(event->key.scancode == SDL_SCANCODE_ESCAPE)

src/renderer.cpp

@@ -1,5 +1,6 @@
 #include "renderer.h"
 #include "gpu.h"
+#include <SDL3/SDL_gamepad.h>
 #include <iostream>
 #define TINYOBJLOADER_IMPLEMENTATION
 #include "tiny_obj_loader.h"
@@ -42,6 +43,7 @@ void Renderer::destroy() {
   if (render_sampler) SDL_ReleaseGPUSampler(dev, render_sampler);
   if (vert_buff)      SDL_ReleaseGPUBuffer(dev, vert_buff);
   if (depth_tex)      SDL_ReleaseGPUTexture(dev, depth_tex);
+  if (gamepad)        SDL_CloseGamepad(gamepad);
   scene.destroy(dev);
   ray.destroy(dev);
   post.destroy(dev);

src/renderer.h

@@ -3,10 +3,12 @@
 #include "pipelines.h"
 #include <SDL3/SDL_gpu.h>
 #include <SDL3/SDL_video.h>
+#include <SDL3/SDL_gamepad.h>
 
 struct Renderer {
   SDL_GPUDevice* dev = nullptr;
   SDL_Window*    win = nullptr;
+  SDL_Gamepad*   gamepad = nullptr;
 
   ScenePipeline scene;
   RayPipeline  ray;