*misc

1 files changed, 12 insertions, 8 deletions

diff --git a/src/core/rasterizer.c b/src/core/rasterizer.c
index d6a9fc1..d926cb0 100644
--- a/src/core/rasterizer.c
+++ b/src/core/rasterizer.c
@@ -237,15 +237,15 @@ void ssrR_line(
 ) {
 	ssr_assert(CA && CB && program && uniforms);
 
-	Vec3 SA, SB;
-	vec4_dividew(CA, &SA); ssrU_viewport(&SA, &SA);
-	vec4_dividew(CB, &SB); ssrU_viewport(&SB, &SB);
+	Vec4 SA, SB;
+	vec4_dividewnoz(CA, &SA); ssrU_viewport(&SA, &SA);
+	vec4_dividewnoz(CB, &SB); ssrU_viewport(&SB, &SB);
 
 	FragmentShader frag_shader = program->fragmentshader;
 	
 	int x0 = SA.x, y0 = SA.y;
 	int x1 = SB.x, y1 = SB.y;
-	float wA = 1 / CA->w, wB = 1 / CB->w;
+	float wA = SA.w, wB = SB.w;
 	float zA = SA.z, zB = SB.z;
 	
 	bool steep = FALSE;
@@ -262,6 +262,8 @@ void ssrR_line(
 		swapf(zA, zB);
 	}
 
+	float inv_wA = 1 / wA, inv_wB = 1 / wB;
+
 	bool depth_test = ssr_isenable(ENABLE_DEPTHTEST);
 	bool blend = ssr_isenable(ENABLE_BLEND);
 	bool write_depth = ssr_isenable(ENABLE_WRITEDEPTH);
@@ -274,15 +276,15 @@ void ssrR_line(
 
 #define discardif(condition) if(condition) continue
 
-	float t, depth;
+	float t, z, w, depth;
 	Vec2 c;
 	int x, y, px, py;
 	for (x = x0; x <= x1; ++x) {
 		t = (x - x0) / (float)(x1 - x0);
 		y = y0 + (y1 - y0)*t;
 		/*caculate center*/
-		c.x = (1 - t) * wA;
-		c.y = t * wB;
+		c.x = (1 - t) * inv_wA;
+		c.y = t * inv_wB;
 		discardif(compare(c.x+c.y, 0));
 		c.x /= (c.x + c.y);
 		t = 1 - c.x;
@@ -295,7 +297,9 @@ void ssrR_line(
 			py = y; 
 		}
 		if (depth_test) {
-			ssrS_lerpnum(t, &zA, &zB, &depth);
+			ssrS_lerpnum(t, &zA, &zB, &z);
+			ssrS_lerpnum(t, &wA, &wB, &w);
+			depth = z / w;
 			pass_depth_test = ssr_testdepth(px, py, depth);
 		}
 		if (stencil_test) {