From 274263806ecd80d6d87ea8d771eacd72128734cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Mon, 7 Apr 2014 17:16:58 +0200
Subject: Add sdl_renderer:set_viewport/{2,5}

---
 c_src/esdl2.h        |  1 +
 c_src/sdl_renderer.c | 27 +++++++++++++++++++++++++++
 src/esdl2.erl        |  4 ++++
 src/sdl_renderer.erl | 12 ++++++++++--
 4 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/c_src/esdl2.h b/c_src/esdl2.h
index 021d5bb..e335ae3 100644
--- a/c_src/esdl2.h
+++ b/c_src/esdl2.h
@@ -189,6 +189,7 @@
 	F(render_set_clip_rect, 5) \
 	F(render_set_logical_size, 3) \
 	F(render_set_scale, 3) \
+	F(render_set_viewport, 5) \
 	F(set_render_draw_color, 5) \
 	/* sdl_surface */ \
 	F(img_load, 1) \
diff --git a/c_src/sdl_renderer.c b/c_src/sdl_renderer.c
index 85432c2..c7354c7 100644
--- a/c_src/sdl_renderer.c
+++ b/c_src/sdl_renderer.c
@@ -848,6 +848,33 @@ NIF_FUNCTION(render_set_scale)
 		NIF_RES_GET(Renderer, renderer_res), scaleXPtr, scaleYPtr);
 }
 
+// render_set_viewport
+
+NIF_CALL_HANDLER(thread_render_set_viewport)
+{
+	SDL_Rect rect = {(long)args[1], (long)args[2], (long)args[3], (long)args[4]};
+
+	if (SDL_RenderSetViewport(args[0], &rect))
+		return sdl_error_tuple(env);
+
+	return atom_ok;
+}
+
+NIF_FUNCTION(render_set_viewport)
+{
+	void* renderer_res;
+	int x, y, w, h;
+
+	BADARG_IF(!enif_get_resource(env, argv[0], res_Renderer, &renderer_res));
+	BADARG_IF(!enif_get_int(env, argv[1], &x));
+	BADARG_IF(!enif_get_int(env, argv[2], &y));
+	BADARG_IF(!enif_get_int(env, argv[3], &w));
+	BADARG_IF(!enif_get_int(env, argv[4], &h));
+
+	return nif_thread_call(env, thread_render_set_viewport, 5,
+		NIF_RES_GET(Renderer, renderer_res), x, y, w, h);
+}
+
 // set_render_draw_color
 
 NIF_CALL_HANDLER(thread_set_render_draw_color)
diff --git a/src/esdl2.erl b/src/esdl2.erl
index e3815c6..61ca09c 100644
--- a/src/esdl2.erl
+++ b/src/esdl2.erl
@@ -77,6 +77,7 @@
 -export([render_set_clip_rect/5]).
 -export([render_set_logical_size/3]).
 -export([render_set_scale/3]).
+-export([render_set_viewport/5]).
 -export([set_render_draw_color/5]).
 
 %% sdl_surface
@@ -295,6 +296,9 @@ render_set_logical_size(_, _, _) ->
 render_set_scale(_, _, _) ->
 	erlang:nif_error({not_loaded, ?MODULE}).
 
+render_set_viewport(_, _, _, _, _) ->
+	erlang:nif_error({not_loaded, ?MODULE}).
+
 set_render_draw_color(_, _, _, _, _) ->
 	erlang:nif_error({not_loaded, ?MODULE}).
 
diff --git a/src/sdl_renderer.erl b/src/sdl_renderer.erl
index fbe2518..12ca9bf 100644
--- a/src/sdl_renderer.erl
+++ b/src/sdl_renderer.erl
@@ -45,6 +45,8 @@
 -export([set_draw_color/5]).
 -export([set_logical_size/3]).
 -export([set_scale/3]).
+-export([set_viewport/2]).
+-export([set_viewport/5]).
 
 clear(Renderer) ->
 	esdl2:render_clear(Renderer),
@@ -155,8 +157,7 @@ present(Renderer) ->
 	esdl2:render_present(Renderer).
 
 set_clip_rect(Renderer, #{x:=X, y:=Y, w:=W, h:=H}) ->
-	esdl2:render_set_clip_rect(Renderer, X, Y, W, H),
-	receive {'_nif_thread_ret_', Ret} -> Ret end.
+	set_clip_rect(Renderer, X, Y, W, H).
 
 set_clip_rect(Renderer, X, Y, W, H) ->
 	esdl2:render_set_clip_rect(Renderer, X, Y, W, H),
@@ -173,3 +174,10 @@ set_logical_size(Renderer, W, H) ->
 set_scale(Renderer, ScaleX, ScaleY) ->
 	esdl2:render_set_scale(Renderer, ScaleX, ScaleY),
 	receive {'_nif_thread_ret_', Ret} -> Ret end.
+
+set_viewport(Renderer, #{x:=X, y:=Y, w:=W, h:=H}) ->
+	set_viewport(Renderer, X, Y, W, H).
+
+set_viewport(Renderer, X, Y, W, H) ->
+	esdl2:render_set_viewport(Renderer, X, Y, W, H),
+	receive {'_nif_thread_ret_', Ret} -> Ret end.
-- 
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