*embed resource in exeHEADmaster

1 files changed, 18 insertions, 16 deletions

diff --git a/src/core/device.c b/src/core/device.c
index 5ff39ef..b810c04 100644
--- a/src/core/device.c
+++ b/src/core/device.c
@@ -500,7 +500,23 @@ static struct {
 extern ClippedBuffer clip_buffer; /*clipping result*/
 
 static bool is_back_face(Vec4* c0, Vec4* c1, Vec4*c2) {
+#define OPENGL_BACKFACE_CULLING  0
 	/*cull in ndc*/
+#if OPENGL_BACKFACE_CULLING
+	/*opengl backface culling algrithm*/
+	float w0 = max(1 / c0->w, 0), w1 = 1 / c1->w, w2 = 1 / c2->w;
+	Vec2 a = { c0->x * w0, c0->y * w0 };
+	Vec2 b = { c1->x * w1, c1->y * w1 };
+	Vec2 c = { c2->x * w2, c2->y * w2 };
+	float signed_area = 0;
+	signed_area += a.x * b.y - a.y * b.x;
+	signed_area += b.x * c.y - b.y * c.x;
+	signed_area += c.x * a.y - c.y * a.x;
+	if (signed_area <= 0) {
+		return TRUE;
+	}
+	return FALSE;
+#else 
 	float w0 = 1 / c0->w, w1 = 1 / c1->w, w2 = 1 / c2->w;
 	bool all_front = w0 > 0 && w1 > 0 && w2 > 0;
 	if (all_front)
@@ -511,25 +527,11 @@ static bool is_back_face(Vec4* c0, Vec4* c1, Vec4*c2) {
 		ac.x = c2->x * w2 - c0->x * w0;
 		ac.y = c2->y * w2 - c0->y * w0;
 		if (ab.x * ac.y - ab.y * ac.x <= 0) {
-			return TRUE; 
+			return TRUE;
 		}
 	}
 	return FALSE;
-	/*OpenGL algrithm*/
-	/*
-	float w0 = max(1 / c0->w, 0), w1 = 1 / c1->w, w2 = 1 / c2->w;
-	Vec2 a = { c0->x * w0, c0->y * w0 };
-	Vec2 b = { c1->x * w1, c1->y * w1 };
-	Vec2 c = { c2->x * w2, c2->y * w2 };
-	float signed_area = 0;
-	signed_area += a.x * b.y - a.y * b.x;
-	signed_area += b.x * c.y - b.y * c.x;
-	signed_area += c.x * a.y - c.y * a.x;
-	if (signed_area <= 0) {
-		return TRUE;
-	}
-	return FALSE;
-	*/
+#endif
 }
 
 static void render_prims_triangle(uint varying_flag) {