Re-hide SDL2 details.

I know I'm backpedaling here, but I think it was a mistake to expose
SDL2 as much as I have here.  I think it's better for people just
getting started to not have to wonder what SDL means.  Making things
as usable as possible for beginners is an important goal, and
abstracting SDL2 + OpenGL things from the core game loop
implementation shouldn't require sacrificing that goal.

* chickadee.scm: Switch code with...
* chickadee/game-loop.scm: ...this! Which is copied straight from...
* chickadee/sdl.scm: ...this! Which is now deleted.
* Makefile.am (SOURCES): Add game-loop.scm, remove sdl.scm.
* examples/grid.scm: Update due to API breakage.
* examples/lines.scm: Ditto.
* examples/nine-patch.scm: Ditto.
* examples/sprite.scm: Ditto.
* examples/text.scm: Ditto.
* examples/tiled.scm: Ditto.
* doc/api.texi (Kernel): Update.

6 files changed, 17 insertions, 22 deletions

diff --git a/examples/grid.scm b/examples/grid.scm
index 6fab47a..0234746 100644
--- a/examples/grid.scm
+++ b/examples/grid.scm
@@ -7,7 +7,6 @@
              (chickadee render font)
              (chickadee render shapes)
              (chickadee render sprite)
-             (chickadee sdl)
              (sdl2 input keyboard))
 
 (define grid (make-grid))
@@ -82,4 +81,4 @@
                          (draw-filled-rect rect item-color)))
                    grid)))
 
-(run-game/sdl #:load load #:draw draw #:update update)
+(run-game #:load load #:draw draw #:update update)
diff --git a/examples/lines.scm b/examples/lines.scm
index f24ec25..b7a551a 100644
--- a/examples/lines.scm
+++ b/examples/lines.scm
@@ -3,8 +3,7 @@
              (chickadee)
              (chickadee math vector)
              (chickadee render color)
-             (chickadee render shapes)
-             (chickadee sdl))
+             (chickadee render shapes))
 
 (define lines
   (list-tabulate 48
@@ -26,4 +25,4 @@
                           #:thickness thickness)))
             lines))
 
-(run-game/sdl #:draw draw)
+(run-game #:draw draw)
diff --git a/examples/nine-patch.scm b/examples/nine-patch.scm
index d20ba06..ff5b9a8 100644
--- a/examples/nine-patch.scm
+++ b/examples/nine-patch.scm
@@ -3,8 +3,7 @@
              (chickadee math vector)
              (chickadee render font)
              (chickadee render sprite)
-             (chickadee render texture)
-             (chickadee sdl))
+             (chickadee render texture))
 
 (define image #f)
 
@@ -15,4 +14,4 @@
   (draw-nine-patch image (make-rect 192.0 192.0 256.0 96.0) #:margin 6)
   (draw-text "I am error." #v(200.0 266.0)))
 
-(run-game/sdl #:load load #:draw draw)
+(run-game #:load load #:draw draw)
diff --git a/examples/sprite.scm b/examples/sprite.scm
index ed968fb..0e8b4b3 100644
--- a/examples/sprite.scm
+++ b/examples/sprite.scm
@@ -1,8 +1,7 @@
 (use-modules (chickadee)
              (chickadee math vector)
              (chickadee render sprite)
-             (chickadee render texture)
-             (chickadee sdl))
+             (chickadee render texture))
 
 (define sprite #f)
 
@@ -12,4 +11,4 @@
 (define (draw alpha)
   (draw-sprite sprite #v(256.0 176.0)))
 
-(run-game/sdl #:load load #:draw draw)
+(run-game #:load load #:draw draw)
diff --git a/examples/text.scm b/examples/text.scm
index d181889..4758782 100644
--- a/examples/text.scm
+++ b/examples/text.scm
@@ -1,8 +1,8 @@
-(use-modules (chickadee math vector)
-             (chickadee render font)
-             (chickadee sdl))
+(use-modules (chickadee)
+             (chickadee math vector)
+             (chickadee render font))
 
 (define (draw alpha)
   (draw-text "Hello, world!" #v(260.0 240.0)))
 
-(run-game/sdl #:draw draw)
+(run-game #:draw draw)
diff --git a/examples/tiled.scm b/examples/tiled.scm
index 19332bb..5ff2b7f 100644
--- a/examples/tiled.scm
+++ b/examples/tiled.scm
@@ -2,7 +2,6 @@
              (chickadee math vector)
              (chickadee math rect)
              (chickadee render tiled)
-             (chickadee sdl)
              (ice-9 match))
 
 (define map #f)
@@ -24,9 +23,9 @@
     ('q (abort-game))
     (_ #t)))
 
-(run-game/sdl #:window-width 320
-              #:window-height 240
-              #:window-title "tile map demo"
-              #:load load
-              #:draw draw
-              #:key-press key-press)
+(run-game #:window-width 320
+          #:window-height 240
+          #:window-title "tile map demo"
+          #:load load
+          #:draw draw
+          #:key-press key-press)