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authorsfan5 <sfan5@live.de>2020-04-25 12:39:17 +0200
committerGitHub <noreply@github.com>2020-04-25 12:39:17 +0200
commit73180a73da9b290e2da8629799696cd8c4eab268 (patch)
treee9f89b3967adfa37b5d1a5e9f533d011b4ded2a0 /src
parent49ed0ca00a9a79b5db0bd6cc4589d56d7f1b3d45 (diff)
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mapblock_mesh: Optimize a few things (#9713)
Diffstat (limited to 'src')
-rw-r--r--src/client/mapblock_mesh.cpp91
1 files changed, 44 insertions, 47 deletions
diff --git a/src/client/mapblock_mesh.cpp b/src/client/mapblock_mesh.cpp
index a5bee6b88..0a1619b3f 100644
--- a/src/client/mapblock_mesh.cpp
+++ b/src/client/mapblock_mesh.cpp
@@ -225,7 +225,7 @@ static u16 getSmoothLightCombined(const v3s16 &p,
return f.light_propagates;
};
- std::array<bool, 4> obstructed = {{ 1, 1, 1, 1 }};
+ bool obstructed[4] = { true, true, true, true };
add_node(0);
bool opaque1 = !add_node(1);
bool opaque2 = !add_node(2);
@@ -372,6 +372,32 @@ void final_color_blend(video::SColor *result,
Mesh generation helpers
*/
+// This table is moved outside getNodeVertexDirs to avoid the compiler using
+// a mutex to initialize this table at runtime right in the hot path.
+// For details search the internet for "cxa_guard_acquire".
+static const v3s16 vertex_dirs_table[] = {
+ // ( 1, 0, 0)
+ v3s16( 1,-1, 1), v3s16( 1,-1,-1),
+ v3s16( 1, 1,-1), v3s16( 1, 1, 1),
+ // ( 0, 1, 0)
+ v3s16( 1, 1,-1), v3s16(-1, 1,-1),
+ v3s16(-1, 1, 1), v3s16( 1, 1, 1),
+ // ( 0, 0, 1)
+ v3s16(-1,-1, 1), v3s16( 1,-1, 1),
+ v3s16( 1, 1, 1), v3s16(-1, 1, 1),
+ // invalid
+ v3s16(), v3s16(), v3s16(), v3s16(),
+ // ( 0, 0,-1)
+ v3s16( 1,-1,-1), v3s16(-1,-1,-1),
+ v3s16(-1, 1,-1), v3s16( 1, 1,-1),
+ // ( 0,-1, 0)
+ v3s16( 1,-1, 1), v3s16(-1,-1, 1),
+ v3s16(-1,-1,-1), v3s16( 1,-1,-1),
+ // (-1, 0, 0)
+ v3s16(-1,-1,-1), v3s16(-1,-1, 1),
+ v3s16(-1, 1, 1), v3s16(-1, 1,-1)
+};
+
/*
vertex_dirs: v3s16[4]
*/
@@ -384,44 +410,16 @@ static void getNodeVertexDirs(const v3s16 &dir, v3s16 *vertex_dirs)
2: top-left
3: top-right
*/
- if (dir == v3s16(0, 0, 1)) {
- // If looking towards z+, this is the face that is behind
- // the center point, facing towards z+.
- vertex_dirs[0] = v3s16(-1,-1, 1);
- vertex_dirs[1] = v3s16( 1,-1, 1);
- vertex_dirs[2] = v3s16( 1, 1, 1);
- vertex_dirs[3] = v3s16(-1, 1, 1);
- } else if (dir == v3s16(0, 0, -1)) {
- // faces towards Z-
- vertex_dirs[0] = v3s16( 1,-1,-1);
- vertex_dirs[1] = v3s16(-1,-1,-1);
- vertex_dirs[2] = v3s16(-1, 1,-1);
- vertex_dirs[3] = v3s16( 1, 1,-1);
- } else if (dir == v3s16(1, 0, 0)) {
- // faces towards X+
- vertex_dirs[0] = v3s16( 1,-1, 1);
- vertex_dirs[1] = v3s16( 1,-1,-1);
- vertex_dirs[2] = v3s16( 1, 1,-1);
- vertex_dirs[3] = v3s16( 1, 1, 1);
- } else if (dir == v3s16(-1, 0, 0)) {
- // faces towards X-
- vertex_dirs[0] = v3s16(-1,-1,-1);
- vertex_dirs[1] = v3s16(-1,-1, 1);
- vertex_dirs[2] = v3s16(-1, 1, 1);
- vertex_dirs[3] = v3s16(-1, 1,-1);
- } else if (dir == v3s16(0, 1, 0)) {
- // faces towards Y+ (assume Z- as "down" in texture)
- vertex_dirs[0] = v3s16( 1, 1,-1);
- vertex_dirs[1] = v3s16(-1, 1,-1);
- vertex_dirs[2] = v3s16(-1, 1, 1);
- vertex_dirs[3] = v3s16( 1, 1, 1);
- } else if (dir == v3s16(0, -1, 0)) {
- // faces towards Y- (assume Z+ as "down" in texture)
- vertex_dirs[0] = v3s16( 1,-1, 1);
- vertex_dirs[1] = v3s16(-1,-1, 1);
- vertex_dirs[2] = v3s16(-1,-1,-1);
- vertex_dirs[3] = v3s16( 1,-1,-1);
- }
+
+ // Direction must be (1,0,0), (-1,0,0), (0,1,0), (0,-1,0),
+ // (0,0,1), (0,0,-1)
+ assert(dir.X * dir.X + dir.Y * dir.Y + dir.Z * dir.Z == 1);
+
+ // Convert direction to single integer for table lookup
+ u8 idx = (dir.X + 2 * dir.Y + 3 * dir.Z) & 7;
+ idx = (idx - 1) * 4;
+
+ memcpy(vertex_dirs, &vertex_dirs_table[idx], 4 * sizeof(v3s16));
}
static void getNodeTextureCoords(v3f base, const v3f &scale, const v3s16 &dir, float *u, float *v)
@@ -892,6 +890,8 @@ static void updateFastFaceRow(
u16 lights[4] = {0, 0, 0, 0};
u8 waving;
TileSpec tile;
+
+ // Get info of first tile
getTileInfo(data, p, face_dir,
makes_face, p_corrected, face_dir_corrected,
lights, waving, tile);
@@ -902,8 +902,6 @@ static void updateFastFaceRow(
// If tiling can be done, this is set to false in the next step
bool next_is_different = true;
- v3s16 p_next;
-
bool next_makes_face = false;
v3s16 next_p_corrected;
v3s16 next_face_dir_corrected;
@@ -912,9 +910,9 @@ static void updateFastFaceRow(
// If at last position, there is nothing to compare to and
// the face must be drawn anyway
if (j != MAP_BLOCKSIZE - 1) {
- p_next = p + translate_dir;
+ p += translate_dir;
- getTileInfo(data, p_next, face_dir,
+ getTileInfo(data, p, face_dir,
next_makes_face, next_p_corrected,
next_face_dir_corrected, next_lights,
waving,
@@ -923,7 +921,7 @@ static void updateFastFaceRow(
if (next_makes_face == makes_face
&& next_p_corrected == p_corrected + translate_dir
&& next_face_dir_corrected == face_dir_corrected
- && memcmp(next_lights, lights, ARRLEN(lights) * sizeof(u16)) == 0
+ && memcmp(next_lights, lights, sizeof(lights)) == 0
// Don't apply fast faces to waving water.
&& (waving != 3 || !waving_liquids)
&& next_tile.isTileable(tile)) {
@@ -961,10 +959,9 @@ static void updateFastFaceRow(
makes_face = next_makes_face;
p_corrected = next_p_corrected;
face_dir_corrected = next_face_dir_corrected;
- std::memcpy(lights, next_lights, ARRLEN(lights) * sizeof(u16));
+ memcpy(lights, next_lights, sizeof(lights));
if (next_is_different)
- tile = next_tile;
- p = p_next;
+ tile = std::move(next_tile); // faster than copy
}
}