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gallium/draw: do not use trig to compute tangent

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We've already done the expensive part of computing this without
trigenometry, e.g computing the length. So let's finish it off.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19899>
This commit is contained in:
Erik Faye-Lund
2022-11-22 09:40:12 +01:00
committed by Marge Bot
parent 089e724259
commit a4690750b7
1 changed files with 3 additions and 4 deletions
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src/gallium/auxiliary/draw/draw_pipe_aaline.c
+3 -4
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@@ -420,13 +420,12 @@ aaline_line(struct draw_stage *stage, struct prim_header *header)
float *pos, *tex;
float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
float a = atan2f(dy, dx);
float c_a = cosf(a), s_a = sinf(a);
float half_length;
float length = sqrtf(dx * dx + dy * dy);
float c_a = dx / length, s_a = dy / length;
float half_length = 0.5 * length;
float t_l, t_w;
uint i;
half_length = 0.5f * sqrtf(dx * dx + dy * dy);
half_length = half_length + 0.5f;
t_w = half_width;