From 9ea4c68e59a070c89914ab2c2b266a2bd41d1066 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Fri, 4 Apr 2014 23:36:51 +0200
Subject: Add sdl_renderer:draw_lines/2

---
 c_src/esdl2.h        |  1 +
 c_src/sdl_renderer.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/esdl2.erl        |  4 ++++
 src/sdl_renderer.erl |  5 +++++
 4 files changed, 52 insertions(+)

diff --git a/c_src/esdl2.h b/c_src/esdl2.h
index 8899602..74e6115 100644
--- a/c_src/esdl2.h
+++ b/c_src/esdl2.h
@@ -174,6 +174,7 @@
 	F(render_copy, 4) \
 	F(render_copy_ex, 7) \
 	F(render_draw_line, 5) \
+	F(render_draw_lines, 2) \
 	F(render_present, 1) \
 	F(render_set_logical_size, 3) \
 	F(set_render_draw_color, 5) \
diff --git a/c_src/sdl_renderer.c b/c_src/sdl_renderer.c
index 2d6c319..7229d21 100644
--- a/c_src/sdl_renderer.c
+++ b/c_src/sdl_renderer.c
@@ -387,6 +387,48 @@ NIF_FUNCTION(render_draw_line)
 		NIF_RES_GET(Renderer, renderer_res), x1, y1, x2, y2);
 }
 
+// render_draw_lines
+
+NIF_CALL_HANDLER(thread_render_draw_lines)
+{
+	int ret;
+
+	ret = SDL_RenderDrawLines(args[0], args[1], (long)args[2]);
+
+	enif_free(args[1]);
+
+	if (ret)
+		return sdl_error_tuple(env);
+
+	return atom_ok;
+}
+
+NIF_FUNCTION(render_draw_lines)
+{
+	void* renderer_res;
+	unsigned int len;
+	SDL_Point* points;
+	ERL_NIF_TERM list, head;
+	int i = 0;
+
+	BADARG_IF(!enif_get_resource(env, argv[0], res_Renderer, &renderer_res));
+	BADARG_IF(!enif_get_list_length(env, argv[1], &len));
+	BADARG_IF(len < 2);
+
+	points = (SDL_Point*)enif_alloc(len * sizeof(SDL_Point));
+
+	list = argv[1];
+	while (enif_get_list_cell(env, list, &head, &list)) {
+		if (!map_to_point(env, head, &(points[i++]))) {
+			enif_free(points);
+			return enif_make_badarg(env);
+		}
+	}
+
+	return nif_thread_call(env, thread_render_draw_lines, 3,
+		NIF_RES_GET(Renderer, renderer_res), points, len);
+}
+
 // render_present
 
 NIF_CAST_HANDLER(thread_render_present)
diff --git a/src/esdl2.erl b/src/esdl2.erl
index 6f38c3b..0a1b421 100644
--- a/src/esdl2.erl
+++ b/src/esdl2.erl
@@ -62,6 +62,7 @@
 -export([render_copy/4]).
 -export([render_copy_ex/7]).
 -export([render_draw_line/5]).
+-export([render_draw_lines/2]).
 -export([render_present/1]).
 -export([render_set_logical_size/3]).
 -export([set_render_draw_color/5]).
@@ -237,6 +238,9 @@ render_copy_ex(_, _, _, _, _, _, _) ->
 render_draw_line(_, _, _, _, _) ->
 	erlang:nif_error({not_loaded, ?MODULE}).
 
+render_draw_lines(_, _) ->
+	erlang:nif_error({not_loaded, ?MODULE}).
+
 render_present(_) ->
 	erlang:nif_error({not_loaded, ?MODULE}).
 
diff --git a/src/sdl_renderer.erl b/src/sdl_renderer.erl
index 624b296..45aa159 100644
--- a/src/sdl_renderer.erl
+++ b/src/sdl_renderer.erl
@@ -25,6 +25,7 @@
 -export([copy/7]).
 -export([draw_line/3]).
 -export([draw_line/5]).
+-export([draw_lines/2]).
 -export([present/1]).
 -export([set_draw_color/5]).
 -export([set_logical_size/3]).
@@ -81,6 +82,10 @@ draw_line(Renderer, X1, Y1, X2, Y2) ->
 	esdl2:render_draw_line(Renderer, X1, Y1, X2, Y2),
 	receive {'_nif_thread_ret_', Ret} -> Ret end.
 
+draw_lines(Renderer, Points) ->
+	esdl2:render_draw_lines(Renderer, Points),
+	receive {'_nif_thread_ret_', Ret} -> Ret end.
+
 present(Renderer) ->
 	esdl2:render_present(Renderer).
 
-- 
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