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gallium: tweak coords for wide lines

This commit is contained in:
Brian Paul 2008-02-29 11:37:12 -07:00
parent 0b47eb4808
commit 2a121e8e22
1 changed files with 12 additions and 9 deletions
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21
src/gallium/auxiliary/draw/draw_wide_line.c
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@ -86,7 +86,10 @@ static void wideline_line( struct draw_stage *stage,
const float dx = FABSF(pos0[0] - pos2[0]);
const float dy = FABSF(pos0[1] - pos2[1]);
/* small tweak to meet GL specification */
const float bias = 0.125f;
/*
* Draw wide line as a quad (two tris) by "stretching" the line along
* X or Y.
@ -95,10 +98,10 @@ static void wideline_line( struct draw_stage *stage,
if (dx > dy) {
/* x-major line */
pos0[1] = pos0[1] - half_width - 0.25f;
pos1[1] = pos1[1] + half_width - 0.25f;
pos2[1] = pos2[1] - half_width - 0.25f;
pos3[1] = pos3[1] + half_width - 0.25f;
pos0[1] = pos0[1] - half_width - bias;
pos1[1] = pos1[1] + half_width - bias;
pos2[1] = pos2[1] - half_width - bias;
pos3[1] = pos3[1] + half_width - bias;
if (pos0[0] < pos2[0]) {
/* left to right line */
pos0[0] -= 0.5f;
@ -116,10 +119,10 @@ static void wideline_line( struct draw_stage *stage,
}
else {
/* y-major line */
pos0[0] = pos0[0] - half_width + 0.25f;
pos1[0] = pos1[0] + half_width + 0.25f;
pos2[0] = pos2[0] - half_width + 0.25f;
pos3[0] = pos3[0] + half_width + 0.25f;
pos0[0] = pos0[0] - half_width + bias;
pos1[0] = pos1[0] + half_width + bias;
pos2[0] = pos2[0] - half_width + bias;
pos3[0] = pos3[0] + half_width + bias;
if (pos0[1] < pos2[1]) {
/* top to bottom line */
pos0[1] -= 0.5f;