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Optimize trigonometry out of MapblockMeshGenerator::drawLiquidTop

This commit is contained in:
numzero 2023-03-02 20:18:59 +03:00 committed by sfan5
parent b8ddde0a96
commit c29d897854
1 changed files with 16 additions and 3 deletions
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19
src/client/content_mapblock.cpp
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@ -770,15 +770,28 @@ void MapblockMeshGenerator::drawLiquidTop()
// Positive if liquid moves towards +X
f32 dx = (corner_levels[0][0] + corner_levels[1][0]) -
(corner_levels[0][1] + corner_levels[1][1]);
f32 tcoord_angle = atan2(dz, dx) * core::RADTODEG;
v2f tcoord_center(0.5, 0.5);
v2f tcoord_translate(blockpos_nodes.Z + p.Z, blockpos_nodes.X + p.X);
tcoord_translate.rotateBy(tcoord_angle);
v2f dir = v2f(dx, dz).normalize();
if (dir == v2f{0.0f, 0.0f}) // if corners are symmetrical
dir = v2f{1.0f, 0.0f};
// Rotate tcoord_translate around the origin. The X axis turns to dir.
tcoord_translate.set(
dir.X * tcoord_translate.X - dir.Y * tcoord_translate.Y,
dir.Y * tcoord_translate.X + dir.X * tcoord_translate.Y);
tcoord_translate.X -= floor(tcoord_translate.X);
tcoord_translate.Y -= floor(tcoord_translate.Y);
for (video::S3DVertex &vertex : vertices) {
vertex.TCoords.rotateBy(tcoord_angle, tcoord_center);
// Rotate vertex.TCoords around tcoord_center. The X axis turns to dir.
vertex.TCoords -= tcoord_center;
vertex.TCoords.set(
dir.X * vertex.TCoords.X - dir.Y * vertex.TCoords.Y,
dir.Y * vertex.TCoords.X + dir.X * vertex.TCoords.Y);
vertex.TCoords += tcoord_center;
vertex.TCoords += tcoord_translate;
}