bugfix in gridUVTessellator, artifacts in tutorial08 are gone now

Author: cbenthin

kernels/common/subdiv/tessellation.h

@@ -149,11 +149,12 @@ namespace embree
     {
       mic_i u_i ( step );
 
-      const mic_m m_u = u_i < grid_u_segments;
       const mic_m m_v = v_i < grid_v_segments;
 
       for (unsigned int x=0;x<grid_u_res;x+=16, u_i += 16)
       {
+        const mic_m m_u = u_i < grid_u_segments;
+
 	const mic_f u = select(m_u, mic_f(u_i) * inv_grid_u_segments, 1.0f);
 	const mic_f v = select(m_v, mic_f(v_i) * inv_grid_v_segments, 1.0f);
 	ustore16f(&u_array[index + x],u);
@@ -176,11 +177,11 @@ namespace embree
     {
       avxi u_i ( step );
 
-      const avxb m_u = u_i < grid_u_segments;
       const avxb m_v = v_i < grid_v_segments;
 
       for (unsigned int x=0;x<grid_u_res;x+=8, u_i += 8)
       {
+        const avxb m_u = u_i < grid_u_segments;
 	const avxf u = select(m_u, avxf(u_i) * inv_grid_u_segments, 1.0f);
 	const avxf v = select(m_v, avxf(v_i) * inv_grid_v_segments, 1.0f);
 	storeu8f(&u_array[index + x],u); // FIXME: store not always 8 bytes aligned !!

tutorials/tutorial08/tutorial08_device.cpp

@@ -228,7 +228,7 @@ Vec3fa renderPixelStandard(float x, float y, const Vec3fa& vx, const Vec3fa& vy,
     shadow.time = 0;
 
     /* trace shadow ray */
-     rtcOccluded(g_scene,shadow);
+    rtcOccluded(g_scene,shadow);
 
     /* add light contribution */
     if (shadow.geomID == RTC_INVALID_GEOMETRY_ID)