From b7b6ce38395876589b1bcc3f08fd9a9cb9ef2545 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Sat, 18 Jan 2020 11:10:05 +0100
Subject: [PATCH] Add mouse (horizontal)

---
 main.c             | 21 ++++++++++++++++++++-
 platform_pokitto.h |  6 ++++++
 platform_sdl.h     | 25 ++++++++++++++++++++-----
 settings.h         |  6 ++++++
 4 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/main.c b/main.c
index 301b346..b168b68 100755
--- a/main.c
+++ b/main.c
@@ -60,6 +60,14 @@
 */
 int8_t SFG_keyPressed(uint8_t key);
 
+/**
+  Optinal function for mouse/analog controls, gets mouse x and y offset in
+  pixels from the game screen center (to achieve classic FPS mouse controls the
+  platform should center the mouse at the end). If the platform isn't using a
+  mouse, this function should simply return [0,0] offets at each call.
+*/
+void SFG_getMouseOffset(int16_t *x, int16_t *y);
+
 /**
   Returns time in ms sice program start.
 */
@@ -1745,7 +1753,6 @@ void SFG_gameStep()
   int8_t shearing = 0;
 
 #if SFG_PREVIEW_MODE == 0
-
   if (
     SFG_keyIsDown(SFG_KEY_B) &&
     !SFG_keyIsDown(SFG_KEY_C) &&
@@ -1915,6 +1922,18 @@ void SFG_gameStep()
         SFG_playerRotateWeapon(1);
     }
 
+    int16_t mouseX, mouseY;
+
+    SFG_getMouseOffset(&mouseX,&mouseY);
+
+    if (mouseX != 0 || mouseY != 0)
+    {
+      SFG_player.camera.direction += 
+        (mouseX * SFG_MOUSE_SENSITIVITY_HORIZONTAL) / 128;
+
+      recomputeDirection = 1;
+    }
+
     if (recomputeDirection)
       SFG_recompurePLayerDirection();
 
diff --git a/platform_pokitto.h b/platform_pokitto.h
index 666d150..3b90074 100644
--- a/platform_pokitto.h
+++ b/platform_pokitto.h
@@ -76,6 +76,12 @@ int8_t SFG_keyPressed(uint8_t key)
   }
 }
 
+void SFG_getMouseOffset(int16_t *x, int16_t *y)
+{
+  *x = 0;
+  *y = 0;
+}
+
 int main()
 {
   pokitto.begin(); 
diff --git a/platform_sdl.h b/platform_sdl.h
index 384372d..de34521 100644
--- a/platform_sdl.h
+++ b/platform_sdl.h
@@ -37,6 +37,11 @@ const uint8_t *sdlKeyboardState;
 
 uint16_t screen[SFG_SCREEN_RESOLUTION_X * SFG_SCREEN_RESOLUTION_Y]; // RGB565 format
 
+SDL_Window *window;
+SDL_Renderer *renderer;
+SDL_Texture *texture;
+SDL_Surface *screenSurface;
+
 void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
 {
   screen[y * SFG_SCREEN_RESOLUTION_X + x] = paletteRGB565[colorIndex];
@@ -54,6 +59,19 @@ void SFG_sleepMs(uint16_t timeMs)
 #endif
 }
 
+void SFG_getMouseOffset(int16_t *x, int16_t *y)
+{
+  int mX, mY;
+
+  SDL_GetMouseState(&mX,&mY);
+
+  *x = mX - SFG_SCREEN_RESOLUTION_X / 2;
+  *y = mY - SFG_SCREEN_RESOLUTION_Y / 2;
+
+  SDL_WarpMouseInWindow(window,
+    SFG_SCREEN_RESOLUTION_X / 2, SFG_SCREEN_RESOLUTION_Y / 2);
+}
+
 int8_t SFG_keyPressed(uint8_t key)
 {
   switch (key)
@@ -117,11 +135,6 @@ int8_t SFG_keyPressed(uint8_t key)
   }
 }
 
-SDL_Window *window;
-SDL_Renderer *renderer;
-SDL_Texture *texture;
-SDL_Surface *screenSurface;
-
 #ifdef __EMSCRIPTEN__
 void mainLoopIteration()
 {
@@ -204,6 +217,8 @@ int main(int argc, char *argv[])
 
   sdlKeyboardState = SDL_GetKeyboardState(NULL);
 
+  SDL_ShowCursor(0);
+
   SFG_init();
 
   int running = 1;
diff --git a/settings.h b/settings.h
index b100c28..54a2201 100644
--- a/settings.h
+++ b/settings.h
@@ -27,6 +27,12 @@
 */
 #define SFG_FPS 60
 
+/**
+  On platforms with mouse this sets its horizontal sensitivity. 128 means 1
+  RCL_Unit per mouse pixel travelled.
+*/
+#define SFG_MOUSE_SENSITIVITY_HORIZONTAL 32
+
 /**
   Width of the screen in pixels. Set this to ACTUAL resolution. If you want the
   game to run at smaller resolution (with bigger pixels), do his using