Sorry , it is v1 not v5 ( for Pineview platform :
http://ark.intel.com/products/codename/32201/Pineview)
-Original Message-
From: Predut, Marius
Sent: Friday, May 29, 2015 2:51 PM
To: mesa-dev@lists.freedesktop.org
Cc: Predut, Marius
Subject: [Mesa-dev][PATCH v5] i915/aa: fixing anti-aliasing bug for thinnest
width lines
On PNV platform, for 1 pixel line thickness or less,
the general anti-aliasing algorithm gives up, and a garbage line is generated.
Setting a Line Width of 0.0 specifies the rasterization
of the thinnest (one-pixel-wide), non-antialiased lines.
Lines rendered with zero Line Width are rasterized using
Grid Intersection Quantization rules as specified by
bspec G45: Volume 2: 3D/Media,
7.3.13.1 Zero-Width (Cosmetic) Line Rasterization section.
This patch follow the same rules as patches fixing the
https://bugs.freedesktop.org/show_bug.cgi?id=28832
bug.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90367
Signed-off-by: Marius Predut marius.pre...@intel.com
---
src/mesa/drivers/dri/i915/i915_state.c | 15 +++
1 file changed, 15 insertions(+)
diff --git a/src/mesa/drivers/dri/i915/i915_state.c
b/src/mesa/drivers/dri/i915/i915_state.c
index 5f10b84..6cd342c 100644
--- a/src/mesa/drivers/dri/i915/i915_state.c
+++ b/src/mesa/drivers/dri/i915/i915_state.c
@@ -599,6 +599,21 @@ i915LineWidth(struct gl_context * ctx, GLfloat widthf)
width = (int) (widthf * 2);
width = CLAMP(width, 1, 0xf);
+
+ if (ctx-Line.Width 1.5 || widthf 1.5) {
+/* For 1 pixel line thickness or less, the general
+ * anti-aliasing algorithm gives up, and a garbage line is
+ * generated. Setting a Line Width of 0.0 specifies the
+ * rasterization of the thinnest (one-pixel-wide),
+ * non-antialiased lines.
+ *
+ * Lines rendered with zero Line Width are rasterized using
+ * Grid Intersection Quantization rules as specified by
+ * bspec G45: Volume 2: 3D/Media,
+ * 7.3.13.1 Zero-Width (Cosmetic) Line Rasterization section
+ */
+width = 0;
+ }
lis4 |= width S4_LINE_WIDTH_SHIFT;
if (lis4 != i915-state.Ctx[I915_CTXREG_LIS4]) {
--
1.9.1
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