diff options
| -rw-r--r-- | src/gallium/auxiliary/draw/draw_pipe_wide_line.c | 61 |
1 files changed, 34 insertions, 27 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pipe_wide_line.c b/src/gallium/auxiliary/draw/draw_pipe_wide_line.c index ab167065815..d7ac95b7405 100644 --- a/src/gallium/auxiliary/draw/draw_pipe_wide_line.c +++ b/src/gallium/auxiliary/draw/draw_pipe_wide_line.c @@ -77,8 +77,11 @@ static void wideline_line( struct draw_stage *stage, const float dx = fabsf(pos0[0] - pos2[0]); const float dy = fabsf(pos0[1] - pos2[1]); + const boolean gl_rasterization_rules = + stage->draw->rasterizer->gl_rasterization_rules; + /* small tweak to meet GL specification */ - const float bias = 0.125f; + const float bias = gl_rasterization_rules ? 0.125f : 0.0f; /* * Draw wide line as a quad (two tris) by "stretching" the line along @@ -92,19 +95,21 @@ static void wideline_line( struct draw_stage *stage, 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; - pos1[0] -= 0.5f; - pos2[0] -= 0.5f; - pos3[0] -= 0.5f; - } - else { - /* right to left line */ - pos0[0] += 0.5f; - pos1[0] += 0.5f; - pos2[0] += 0.5f; - pos3[0] += 0.5f; + if (gl_rasterization_rules) { + if (pos0[0] < pos2[0]) { + /* left to right line */ + pos0[0] -= 0.5f; + pos1[0] -= 0.5f; + pos2[0] -= 0.5f; + pos3[0] -= 0.5f; + } + else { + /* right to left line */ + pos0[0] += 0.5f; + pos1[0] += 0.5f; + pos2[0] += 0.5f; + pos3[0] += 0.5f; + } } } else { @@ -113,19 +118,21 @@ static void wideline_line( struct draw_stage *stage, 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; - pos1[1] -= 0.5f; - pos2[1] -= 0.5f; - pos3[1] -= 0.5f; - } - else { - /* bottom to top line */ - pos0[1] += 0.5f; - pos1[1] += 0.5f; - pos2[1] += 0.5f; - pos3[1] += 0.5f; + if (gl_rasterization_rules) { + if (pos0[1] < pos2[1]) { + /* top to bottom line */ + pos0[1] -= 0.5f; + pos1[1] -= 0.5f; + pos2[1] -= 0.5f; + pos3[1] -= 0.5f; + } + else { + /* bottom to top line */ + pos0[1] += 0.5f; + pos1[1] += 0.5f; + pos2[1] += 0.5f; + pos3[1] += 0.5f; + } } } |