Add sdl_renderer:get_draw_blend_mode/1

Also changed a little the count_drivers/0 function to return
the result directly instead of {ok, Count}. Let it crash!

4 files changed, 54 insertions, 4 deletions

diff --git a/c_src/esdl2.h b/c_src/esdl2.h
index b4a5ad4..1f0ee3c 100644
--- a/c_src/esdl2.h
+++ b/c_src/esdl2.h
@@ -20,7 +20,9 @@
 // List of atoms used by this NIF.
 
 #define NIF_ATOMS(A) \
+	A(add) \
 	A(allow_high_dpi) \
+	A(blend) \
 	A(borderless) \
 	A(button) \
 	A(caps) \
@@ -63,6 +65,7 @@
 	A(mouse_wheel) \
 	A(moved) \
 	A(no_battery) \
+	A(none) \
 	A(num) \
 	A(on_battery) \
 	A(opengl) \
@@ -147,6 +150,7 @@
 	/* sdl_renderer */ \
 	F(create_renderer, 3) \
 	F(get_num_render_drivers, 0) \
+	F(get_render_draw_blend_mode, 1) \
 	F(render_clear, 1) \
 	F(render_copy, 4) \
 	F(render_present, 1) \
diff --git a/c_src/sdl_renderer.c b/c_src/sdl_renderer.c
index 023851f..5f90f14 100644
--- a/c_src/sdl_renderer.c
+++ b/c_src/sdl_renderer.c
@@ -27,6 +27,14 @@ void dtor_Renderer(ErlNifEnv* env, void* obj)
 
 NIF_LIST_TO_FLAGS_FUNCTION(list_to_renderer_flags, Uint32, RENDERER_FLAGS)
 
+#define BLEND_MODE_ENUM(E) \
+	E(none, SDL_BLENDMODE_NONE) \
+	E(blend, SDL_BLENDMODE_BLEND) \
+	E(add, SDL_BLENDMODE_ADD) \
+	E(mod, SDL_BLENDMODE_MOD)
+
+NIF_ENUM_TO_ATOM_FUNCTION(blend_mode_to_atom, SDL_BlendMode, BLEND_MODE_ENUM)
+
 int map_to_rect(ErlNifEnv* env, ERL_NIF_TERM map, SDL_Rect* rect)
 {
 	ERL_NIF_TERM x, y, w, h;
@@ -100,6 +108,31 @@ NIF_FUNCTION(get_num_render_drivers)
 	);
 }
 
+// get_render_draw_blend_mode
+
+NIF_CALL_HANDLER(thread_get_render_draw_blend_mode)
+{
+	SDL_BlendMode mode;
+
+	if (SDL_GetRenderDrawBlendMode(args[0], &mode))
+		return sdl_error_tuple(env);
+
+	return enif_make_tuple2(env,
+		atom_ok,
+		blend_mode_to_atom(mode)
+	);
+}
+
+NIF_FUNCTION(get_render_draw_blend_mode)
+{
+	void* renderer_res;
+
+	BADARG_IF(!enif_get_resource(env, argv[0], res_Renderer, &renderer_res));
+
+	return nif_thread_call(env, thread_get_render_draw_blend_mode, 1,
+		NIF_RES_GET(Renderer, renderer_res));
+}
+
 // render_clear
 
 NIF_CALL_HANDLER(thread_render_clear)
diff --git a/src/esdl2.erl b/src/esdl2.erl
index aa685ac..add7453 100644
--- a/src/esdl2.erl
+++ b/src/esdl2.erl
@@ -55,6 +55,7 @@
 %% sdl_renderer
 -export([create_renderer/3]).
 -export([get_num_render_drivers/0]).
+-export([get_render_draw_blend_mode/1]).
 -export([render_clear/1]).
 -export([render_copy/4]).
 -export([render_present/1]).
@@ -211,6 +212,9 @@ create_renderer(_, _, _) ->
 get_num_render_drivers() ->
 	erlang:nif_error({not_loaded, ?MODULE}).
 
+get_render_draw_blend_mode(_) ->
+	erlang:nif_error({not_loaded, ?MODULE}).
+
 render_clear(_) ->
 	erlang:nif_error({not_loaded, ?MODULE}).
 
diff --git a/src/sdl_renderer.erl b/src/sdl_renderer.erl
index 6abd626..18c368c 100644
--- a/src/sdl_renderer.erl
+++ b/src/sdl_renderer.erl
@@ -15,10 +15,11 @@
 -module(sdl_renderer).
 
 -export([create/3]).
+-export([count_drivers/0]).
+-export([get_draw_blend_mode/1]).
 -export([clear/1]).
 -export([copy/2]).
 -export([copy/4]).
--export([count_drivers/0]).
 -export([present/1]).
 -export([set_draw_color/5]).
 -export([set_logical_size/3]).
@@ -27,6 +28,17 @@ create(Window, Index, Flags) ->
 	esdl2:create_renderer(Window, Index, Flags),
 	receive {'_nif_thread_ret_', Ret} -> Ret end.
 
+count_drivers() ->
+	{ok, Count} = esdl2:get_num_render_drivers(),
+	Count.
+
+get_draw_blend_mode(Renderer) ->
+	esdl2:get_render_draw_blend_mode(Renderer),
+	receive {'_nif_thread_ret_', Ret} ->
+		{ok, Mode} = Ret,
+		Mode
+	end.
+
 clear(Renderer) ->
 	esdl2:render_clear(Renderer),
 	receive {'_nif_thread_ret_', Ret} -> Ret end.
@@ -39,9 +51,6 @@ copy(Renderer, Texture, SrcRect, DstRect) ->
 	esdl2:render_copy(Renderer, Texture, SrcRect, DstRect),
 	receive {'_nif_thread_ret_', Ret} -> Ret end.
 
-count_drivers() ->
-	esdl2:get_num_render_drivers().
-
 present(Renderer) ->
 	esdl2:render_present(Renderer).