add rudimentary SDL1 controller backend

it's more to deal with the mouse not working I suppose

Makefile

@@ -62,7 +62,7 @@ RENDER_API ?= GL
 WINDOW_API ?= SDL2
 # Audio backends: SDL1, SDL2
 AUDIO_API ?= SDL2
-# Controller backends (can have multiple, space separated): SDL2
+# Controller backends (can have multiple, space separated): SDL2, SDL1
 CONTROLLER_API ?= SDL2
 
 # Misc settings for EXTERNAL_DATA

src/pc/controller/controller_entry_point.c

@@ -13,16 +13,15 @@
 
 static struct ControllerAPI *controller_implementations[] = {
     &controller_recorded_tas,
-    #ifdef CAPI_SDL2
+    #if defined(CAPI_SDL2) || defined(CAPI_SDL1)
     &controller_sdl,
     #endif
     &controller_keyboard,
 };
 
 s32 osContInit(UNUSED OSMesgQueue *mq, u8 *controllerBits, UNUSED OSContStatus *status) {
-    for (size_t i = 0; i < sizeof(controller_implementations) / sizeof(struct ControllerAPI *); i++) {
+    for (size_t i = 0; i < sizeof(controller_implementations) / sizeof(struct ControllerAPI *); i++)
         controller_implementations[i]->init();
-    }
     *controllerBits = 1;
     return 0;
 }

src/pc/controller/controller_sdl1.c

@@ -0,0 +1,285 @@
+#ifdef CAPI_SDL1
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <math.h>
+
+#include <SDL/SDL.h>
+
+// Analog camera movement by Pathétique (github.com/vrmiguel), y0shin and Mors
+// Contribute or communicate bugs at github.com/vrmiguel/sm64-analog-camera
+
+#include <ultra64.h>
+
+#include "controller_api.h"
+#include "controller_sdl.h"
+#include "../configfile.h"
+#include "../platform.h"
+#include "../fs/fs.h"
+
+#include "game/level_update.h"
+
+// mouse buttons are also in the controller namespace (why), just offset 0x100
+#define VK_OFS_SDL_MOUSE 0x0100
+#define VK_BASE_SDL_MOUSE (VK_BASE_SDL_GAMEPAD + VK_OFS_SDL_MOUSE)
+#define MAX_JOYBINDS 32
+#define MAX_MOUSEBUTTONS 8 // arbitrary
+#define MAX_JOYBUTTONS 32  // arbitrary; includes virtual keys for triggers
+#define AXIS_THRESHOLD (30 * 256)
+
+enum {
+    JOY_AXIS_LEFTX,
+    JOY_AXIS_LEFTY,
+    JOY_AXIS_RIGHTX,
+    JOY_AXIS_RIGHTY,
+    JOY_AXIS_LTRIG,
+    JOY_AXIS_RTRIG,
+    MAX_AXES,
+};
+
+int mouse_x;
+int mouse_y;
+
+#ifdef BETTERCAMERA
+extern u8 newcam_mouse;
+#endif
+
+static bool init_ok;
+static SDL_Joystick *sdl_joy;
+
+static u32 num_joy_binds = 0;
+static u32 num_mouse_binds = 0;
+static u32 joy_binds[MAX_JOYBINDS][2];
+static u32 mouse_binds[MAX_JOYBINDS][2];
+static int joy_axis_binds[MAX_AXES] = { 0, 1, 2, 3, 4, 5 };
+
+static bool joy_buttons[MAX_JOYBUTTONS] = { false };
+static u32 mouse_buttons = 0;
+static u32 last_mouse = VK_INVALID;
+static u32 last_joybutton = VK_INVALID;
+
+static int num_joy_axes = 0;
+static int num_joy_buttons = 0;
+static int num_joy_hats = 0;
+
+static inline void controller_add_binds(const u32 mask, const u32 *btns) {
+    for (u32 i = 0; i < MAX_BINDS; ++i) {
+        if (btns[i] >= VK_BASE_SDL_GAMEPAD && btns[i] <= VK_BASE_SDL_GAMEPAD + VK_SIZE) {
+            if (btns[i] >= VK_BASE_SDL_MOUSE && num_joy_binds < MAX_JOYBINDS) {
+                mouse_binds[num_mouse_binds][0] = btns[i] - VK_BASE_SDL_MOUSE;
+                mouse_binds[num_mouse_binds][1] = mask;
+                ++num_mouse_binds;
+            } else if (num_mouse_binds < MAX_JOYBINDS) {
+                joy_binds[num_joy_binds][0] = btns[i] - VK_BASE_SDL_GAMEPAD;
+                joy_binds[num_joy_binds][1] = mask;
+                ++num_joy_binds;
+            }
+        }
+    }
+}
+
+static void controller_sdl_bind(void) {
+    bzero(joy_binds, sizeof(joy_binds));
+    bzero(mouse_binds, sizeof(mouse_binds));
+    num_joy_binds = 0;
+    num_mouse_binds = 0;
+
+    controller_add_binds(A_BUTTON,     configKeyA);
+    controller_add_binds(B_BUTTON,     configKeyB);
+    controller_add_binds(Z_TRIG,       configKeyZ);
+    controller_add_binds(STICK_UP,     configKeyStickUp);
+    controller_add_binds(STICK_LEFT,   configKeyStickLeft);
+    controller_add_binds(STICK_DOWN,   configKeyStickDown);
+    controller_add_binds(STICK_RIGHT,  configKeyStickRight);
+    controller_add_binds(U_CBUTTONS,   configKeyCUp);
+    controller_add_binds(L_CBUTTONS,   configKeyCLeft);
+    controller_add_binds(D_CBUTTONS,   configKeyCDown);
+    controller_add_binds(R_CBUTTONS,   configKeyCRight);
+    controller_add_binds(L_TRIG,       configKeyL);
+    controller_add_binds(R_TRIG,       configKeyR);
+    controller_add_binds(START_BUTTON, configKeyStart);
+}
+
+static void controller_sdl_init(void) {
+    if (SDL_Init(SDL_INIT_JOYSTICK) != 0) {
+        fprintf(stderr, "SDL init error: %s\n", SDL_GetError());
+        return;
+    }
+
+    if (SDL_NumJoysticks() > 0)
+        sdl_joy = SDL_JoystickOpen(0);
+
+    if (sdl_joy) {
+        num_joy_axes = SDL_JoystickNumAxes(sdl_joy);
+        num_joy_buttons = SDL_JoystickNumButtons(sdl_joy);
+        num_joy_hats = SDL_JoystickNumHats(sdl_joy);
+
+        for (int i = 0; i < MAX_AXES; ++i)
+            if (i >= num_joy_axes)
+                joy_axis_binds[i] = -1;
+    }
+
+#ifdef BETTERCAMERA
+    if (newcam_mouse == 1)
+        SDL_WM_GrabInput(SDL_GRAB_ON);
+    SDL_GetRelativeMouseState(&mouse_x, &mouse_y);
+#endif
+
+    controller_sdl_bind();
+
+    init_ok = true;
+}
+
+static inline void update_button(const int i, const bool new) {
+    const bool pressed = !joy_buttons[i] && new;
+    joy_buttons[i] = new;
+    if (pressed) last_joybutton = i;
+}
+
+static inline int16_t get_axis(const int i) {
+    if (joy_axis_binds[i] >= 0)
+        return SDL_JoystickGetAxis(sdl_joy, i);
+    else
+        return 0;
+}
+
+static void controller_sdl_read(OSContPad *pad) {
+    if (!init_ok) return;
+
+#ifdef BETTERCAMERA
+    if (newcam_mouse == 1 && sCurrPlayMode != 2)
+        SDL_WM_GrabInput(SDL_GRAB_ON);
+    else
+        SDL_WM_GrabInput(SDL_GRAB_OFF);
+    
+    u32 mouse = SDL_GetRelativeMouseState(&mouse_x, &mouse_y);
+
+    for (u32 i = 0; i < num_mouse_binds; ++i)
+        if (mouse & SDL_BUTTON(mouse_binds[i][0]))
+            pad->button |= mouse_binds[i][1];
+
+    // remember buttons that changed from 0 to 1
+    last_mouse = (mouse_buttons ^ mouse) & mouse;
+    mouse_buttons = mouse;
+#endif
+
+    if (!sdl_joy) return;
+
+    SDL_JoystickUpdate();
+
+    int16_t leftx = get_axis(JOY_AXIS_LEFTX);
+    int16_t lefty = get_axis(JOY_AXIS_LEFTY);
+    int16_t rightx = get_axis(JOY_AXIS_RIGHTX);
+    int16_t righty = get_axis(JOY_AXIS_RIGHTY);
+
+    int16_t ltrig = get_axis(JOY_AXIS_LTRIG);
+    int16_t rtrig = get_axis(JOY_AXIS_RTRIG);
+
+#ifdef TARGET_WEB
+    // Firefox has a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1606562
+    // It sets down y to 32768.0f / 32767.0f, which is greater than the allowed 1.0f,
+    // which SDL then converts to a int16_t by multiplying by 32767.0f, which overflows into -32768.
+    // Maximum up will hence never become -32768 with the current version of SDL2,
+    // so this workaround should be safe in compliant browsers.
+    if (lefty == -32768) {
+        lefty = 32767;
+    }
+    if (righty == -32768) {
+        righty = 32767;
+    }
+#endif
+
+    for (int i = 0; i < num_joy_buttons; ++i) {
+        const bool new = SDL_JoystickGetButton(sdl_joy, i);
+        update_button(i, new);
+    }
+
+    update_button(VK_LTRIGGER - VK_BASE_SDL_GAMEPAD, ltrig > AXIS_THRESHOLD);
+    update_button(VK_RTRIGGER - VK_BASE_SDL_GAMEPAD, rtrig > AXIS_THRESHOLD);
+
+    u32 buttons_down = 0;
+    for (u32 i = 0; i < num_joy_binds; ++i)
+        if (joy_buttons[joy_binds[i][0]])
+            buttons_down |= joy_binds[i][1];
+
+    pad->button |= buttons_down;
+
+    const u32 xstick = buttons_down & STICK_XMASK;
+    const u32 ystick = buttons_down & STICK_YMASK;
+    if (xstick == STICK_LEFT)
+        pad->stick_x = -128;
+    else if (xstick == STICK_RIGHT)
+        pad->stick_x = 127;
+    if (ystick == STICK_DOWN)
+        pad->stick_y = -128;
+    else if (ystick == STICK_UP)
+        pad->stick_y = 127;
+
+    if (rightx < -0x4000) pad->button |= L_CBUTTONS;
+    if (rightx > 0x4000) pad->button |= R_CBUTTONS;
+    if (righty < -0x4000) pad->button |= U_CBUTTONS;
+    if (righty > 0x4000) pad->button |= D_CBUTTONS;
+
+    uint32_t magnitude_sq = (uint32_t)(leftx * leftx) + (uint32_t)(lefty * lefty);
+    uint32_t stickDeadzoneActual = configStickDeadzone * DEADZONE_STEP;
+    if (magnitude_sq > (uint32_t)(stickDeadzoneActual * stickDeadzoneActual)) {
+        pad->stick_x = leftx / 0x100;
+        int stick_y = -lefty / 0x100;
+        pad->stick_y = stick_y == 128 ? 127 : stick_y;
+    }
+
+    magnitude_sq = (uint32_t)(rightx * rightx) + (uint32_t)(righty * righty);
+    stickDeadzoneActual = configStickDeadzone * DEADZONE_STEP;
+    if (magnitude_sq > (uint32_t)(stickDeadzoneActual * stickDeadzoneActual)) {
+        pad->ext_stick_x = rightx / 0x100;
+        int stick_y = -righty / 0x100;
+        pad->ext_stick_y = stick_y == 128 ? 127 : stick_y;
+    }
+}
+
+static void controller_sdl_rumble_play(f32 strength, f32 length) { }
+
+static void controller_sdl_rumble_stop(void) { }
+
+static u32 controller_sdl_rawkey(void) {
+    if (last_joybutton != VK_INVALID) {
+        const u32 ret = last_joybutton;
+        last_joybutton = VK_INVALID;
+        return ret;
+    }
+
+    for (int i = 0; i < MAX_MOUSEBUTTONS; ++i) {
+        if (last_mouse & SDL_BUTTON(i)) {
+            const u32 ret = VK_OFS_SDL_MOUSE + i;
+            last_mouse = 0;
+            return ret;
+        }
+    }
+    return VK_INVALID;
+}
+
+static void controller_sdl_shutdown(void) {
+    if (SDL_WasInit(SDL_INIT_JOYSTICK)) {
+        if (sdl_joy) {
+            SDL_JoystickClose(sdl_joy);
+            sdl_joy = NULL;
+        }
+        SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
+    }
+
+    init_ok = false;
+}
+
+struct ControllerAPI controller_sdl = {
+    VK_BASE_SDL_GAMEPAD,
+    controller_sdl_init,
+    controller_sdl_read,
+    controller_sdl_rawkey,
+    controller_sdl_rumble_play,
+    controller_sdl_rumble_stop,
+    controller_sdl_bind,
+    controller_sdl_shutdown
+};
+
+#endif // CAPI_SDL1