Add integer scaling option (#2)

This patch adds option ‚3‘ integer scaling. dst_rect is an integral
multiple of src_rect. Should prevent scaling artifacts.

debian/control

@@ -12,8 +12,6 @@ Build-Depends: debhelper (>= 9),
                dh-autoreconf,
                dpkg-dev (>= 1.16.1~),
                libasound2-dev [linux-any],
-               libgl1-mesa-dev,
-               libpulse-dev,
                libudev-dev [linux-any],
                libdbus-1-dev [linux-any],
                libibus-1.0-dev[linux-any],
@@ -30,16 +28,16 @@ Build-Depends: debhelper (>= 9),
                libxxf86vm-dev
 Homepage: http://www.libsdl.org/
 
-Package: libsdl2
+Package: libsdl2-2.0-0
 Architecture: any
 Multi-Arch: same
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends},
          ${shlibs:Depends},
-         libudev0 [linux-any],
+         libudev0 | libudev1 [linux-any],
          libdbus-1-3 [linux-any]
-Conflicts: libsdl-1.3-0
-Replaces: libsdl-1.3-0
+Conflicts: libsdl-1.3-0, libsdl2
+Replaces: libsdl-1.3-0, libsdl2
 Description: Simple DirectMedia Layer
  SDL is a library that allows programs portable low level access to
  a video framebuffer, audio output, mouse, and keyboard.
@@ -51,9 +49,9 @@ Section: libdevel
 Architecture: any
 Multi-Arch: same
 Depends: ${misc:Depends},
-         libsdl2 (= ${binary:Version}),
+         libsdl2-2.0-0 (= ${binary:Version}),
          libc6-dev,
-         libgl1-mesa-dev
+         libx11-dev
 Conflicts: libsdl-1.3-dev
 Replaces: libsdl-1.3-dev
 Description: Simple DirectMedia Layer development files
@@ -68,7 +66,7 @@ Section: debug
 Architecture: any
 Multi-Arch: same
 Depends: ${misc:Depends},
-         libsdl2 (= ${binary:Version}),
+         libsdl2-2.0-0 (= ${binary:Version}),
 Description: Simple DirectMedia Layer debug files
  SDL is a library that allows programs portable low level access to a video
  framebuffer, audio output, mouse, and keyboard.

debian/libsdl2-dev.install

@@ -5,4 +5,5 @@ usr/lib/*/libSDL2.a
 usr/lib/*/libSDL2main.a
 usr/lib/*/libSDL2_test.a
 usr/lib/*/pkgconfig/sdl2.pc
+usr/lib/*/cmake/SDL2
 usr/share/aclocal/sdl2.m4

debian/rules

@@ -6,7 +6,10 @@ DEB_HOST_MULTIARCH ?= $(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 confflags = --disable-rpath --disable-video-directfb \
             --disable-nas --disable-esd --disable-arts \
             --disable-alsa-shared --disable-pulseaudio-shared \
-            --disable-x11-shared
+            --disable-x11-shared  --disable-video-opengl --enable-video-opengles \
+            --disable-esd --disable-pulseaudio \
+            --disable-input-tslib \
+            --host=armv6l-raspberry-linux-gnueabihf
 
 %:
 	dh $@ --parallel

include/SDL_hints.h

@@ -621,6 +621,33 @@ extern "C" {
  */
 #define SDL_HINT_NO_SIGNAL_HANDLERS   "SDL_NO_SIGNAL_HANDLERS"
 
+/**
+ *  \brief Tell dispmanx to stretch the SDL window to fill the display.
+ *
+ * This hint only applies to the rpi video driver.
+ *
+ * The variable can be set to the following values:
+ *   "0"       - Window resolution is desktop resolution.
+ *               This is the behaviour of SDL <= 2.0.4. (default)
+ *   "1"       - Requested video resolution will be scaled to desktop resolution.
+ *               Aspect ratio of requested video resolution will be respected.
+ *   "2"       - Requested video resolution will be scaled to desktop resolution.
+ *   "3"       - Requested video resolution will be scaled to desktop resolution.
+ *               Aspect ratio of requested video resolution will be respected.
+ *               If possible output resolution will be integral multiple of video
+ *               resolution.
+ */
+#define SDL_HINT_VIDEO_RPI_SCALE_MODE    "SDL_VIDEO_RPI_SCALE_MODE"
+
+/**
+ *  \brief Tell dispmanx to set a specific aspect ratio.
+ *
+ * This hint only applies to the rpi video driver.
+ *
+ * Must be set together with SDL_HINT_VIDEO_RPI_SCALE_MODE=1.
+ */
+#define SDL_HINT_VIDEO_RPI_RATIO    "SDL_VIDEO_RPI_RATIO"
+
 /**
  *  \brief Tell SDL not to generate window-close events for Alt+F4 on Windows.
  *

src/core/linux/SDL_evdev.c

@@ -712,9 +712,11 @@ SDL_EVDEV_translate_keycode(int keycode)
     if (keycode < SDL_arraysize(EVDEV_Keycodes)) {
         scancode = EVDEV_Keycodes[keycode];
     }
+    /*
     if (scancode == SDL_SCANCODE_UNKNOWN) {
         SDL_Log("The key you just pressed is not recognized by SDL. To help get this fixed, please report this to the SDL mailing list <sdl@libsdl.org> EVDEV KeyCode %d \n", keycode);
     }
+    */
     return scancode;
 }
 

src/joystick/linux/SDL_sysjoystick.c

@@ -492,7 +492,7 @@ ConfigJoystick(SDL_Joystick * joystick, int fd)
                 ++joystick->nbuttons;
             }
         }
-        for (i = 0; i < ABS_MAX; ++i) {
+        for (i = 0; i < ABS_MISC; ++i) {
             /* Skip hats */
             if (i == ABS_HAT0X) {
                 i = ABS_HAT3Y;
@@ -753,6 +753,10 @@ HandleInputEvents(SDL_Joystick * joystick)
                 }
                 break;
             case EV_ABS:
+                if (code >= ABS_MISC) {
+                    break;
+                }
+
                 switch (code) {
                 case ABS_HAT0X:
                 case ABS_HAT0Y:

src/video/raspberry/SDL_rpivideo.c

@@ -31,6 +31,7 @@
  */
 
 /* SDL internals */
+#include "SDL_hints.h"
 #include "../SDL_sysvideo.h"
 #include "SDL_version.h"
 #include "SDL_syswm.h"
@@ -214,6 +215,9 @@ RPI_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
 int
 RPI_CreateWindow(_THIS, SDL_Window * window)
 {
+    const char *hintScale = SDL_GetHint(SDL_HINT_VIDEO_RPI_SCALE_MODE);
+    const char *hintRatio = SDL_GetHint(SDL_HINT_VIDEO_RPI_RATIO);
+    char scalemode = '0';
     SDL_WindowData *wdata;
     SDL_VideoDisplay *display;
     SDL_DisplayData *displaydata;
@@ -235,23 +239,89 @@ RPI_CreateWindow(_THIS, SDL_Window * window)
     display = SDL_GetDisplayForWindow(window);
     displaydata = (SDL_DisplayData *) display->driverdata;
 
-    /* Windows have one size for now */
-    window->w = display->desktop_mode.w;
-    window->h = display->desktop_mode.h;
+    float srcAspect = 1; 
+    float dstAspect = 1;
+    int factor_x = 0;
+    int factor_y = 0;
 
-    /* OpenGL ES is the law here, buddy */
-    window->flags |= SDL_WINDOW_OPENGL;
+    if (hintScale != NULL)
+        scalemode = *hintScale;
 
     /* Create a dispman element and associate a window to it */
-    dst_rect.x = 0;
-    dst_rect.y = 0;
-    dst_rect.width = window->w;
-    dst_rect.height = window->h;
+    switch(scalemode) {
+        case '3':
+            /* Pixel perfect scaling mode. */
+            factor_x = (display->desktop_mode.w / window->w);
+            factor_y = (display->desktop_mode.h / window->h);
+            if ((factor_x != 0) && (factor_y != 0)) {
+                if (factor_x >= factor_y) {
+                    dst_rect.width = window->w * factor_y;
+                    dst_rect.height = window->h * factor_y;
+                }
+                else {
+                    dst_rect.width = window->w * factor_x;
+                    dst_rect.height = window->h * factor_x;
+                }
+                /* Center window. */
+                dst_rect.x = (display->desktop_mode.w - dst_rect.width) / 2;
+                dst_rect.y = (display->desktop_mode.h - dst_rect.height) / 2;
+                break;
+            }
+            /* If integer scale is not possible fallback to mode 1. */
+        case '1':
+            /* Fullscreen mode. */
+            /* Calculate source and destination aspect ratios. */
+            if (hintRatio != NULL) 
+                srcAspect = strtof(hintRatio, NULL);
+            else
+                srcAspect = (float)window->w / (float)window->h; 
+            /* only allow sensible aspect ratios */
+            if (srcAspect < 0.2f || srcAspect > 6.0f)
+                srcAspect = (float)window->w / (float)window->h;
+            dstAspect = (float)display->desktop_mode.w / (float)display->desktop_mode.h;
+            /* If source and destination aspect ratios are not equal correct destination width. */
+            if (srcAspect < dstAspect) {
+                dst_rect.width = (unsigned)(display->desktop_mode.h * srcAspect);
+                dst_rect.height = display->desktop_mode.h;
+            }
+            else if (srcAspect > dstAspect) {
+                dst_rect.width = display->desktop_mode.w;
+                dst_rect.height = (unsigned)((float)display->desktop_mode.w / srcAspect);
+            }
+            else {
+                dst_rect.width = display->desktop_mode.w;
+                dst_rect.height = display->desktop_mode.h;
+            }
+            /* Center window. */
+            dst_rect.x = (display->desktop_mode.w - dst_rect.width) / 2;
+            dst_rect.y = (display->desktop_mode.h - dst_rect.height) / 2;
+            break;
+        case '2':
+            /* Fullscreen streched mode. */
+            dst_rect.x = 0;
+            dst_rect.y = 0;
+            dst_rect.width = display->desktop_mode.w;
+            dst_rect.height = display->desktop_mode.h;
+            break;
+        default:
+            /* Default mode. */
+            window->w = display->desktop_mode.w;
+            window->h = display->desktop_mode.h;
+
+            dst_rect.x = 0;
+            dst_rect.y = 0;
+            dst_rect.width = window->w;
+            dst_rect.height = window->h;
+            break;
+    }
 
     src_rect.x = 0;
     src_rect.y = 0;
     src_rect.width = window->w << 16;
     src_rect.height = window->h << 16;
+    
+    /* OpenGL ES is the law here, buddy */
+    window->flags |= SDL_WINDOW_OPENGL;
 
     dispman_update = vc_dispmanx_update_start( 0 );
     wdata->dispman_window.element = vc_dispmanx_element_add ( dispman_update, displaydata->dispman_display, SDL_RPI_VIDEOLAYER /* layer */, &dst_rect, 0/*src*/, &src_rect, DISPMANX_PROTECTION_NONE, &dispman_alpha /*alpha*/, 0/*clamp*/, 0/*transform*/);