adjustment to coverage sample positions

1 files changed, 33 insertions, 32 deletions

diff --git a/src/mesa/swrast/s_aatriangle.c b/src/mesa/swrast/s_aatriangle.c
index df2182a0f0a..b64424e39a1 100644
--- a/src/mesa/swrast/s_aatriangle.c
+++ b/src/mesa/swrast/s_aatriangle.c
@@ -1,4 +1,4 @@
-/* $Id: s_aatriangle.c,v 1.10 2001/03/19 02:25:36 keithw Exp $ */
+/* $Id: s_aatriangle.c,v 1.11 2001/03/28 21:37:24 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -138,25 +138,26 @@ static GLfloat
 compute_coveragef(const GLfloat v0[3], const GLfloat v1[3],
                   const GLfloat v2[3], GLint winx, GLint winy)
 {
+#define B 0.125
    static const GLfloat samples[16][2] = {
       /* start with the four corners */
-      { 0.00, 0.00 },
-      { 0.75, 0.00 },
-      { 0.00, 0.75 },
-      { 0.75, 0.75 },
+      { 0.00+B, 0.00+B },
+      { 0.75+B, 0.00+B },
+      { 0.00+B, 0.75+B },
+      { 0.75+B, 0.75+B },
       /* continue with interior samples */
-      { 0.25, 0.00 },
-      { 0.50, 0.00 },
-      { 0.00, 0.25 },
-      { 0.25, 0.25 },
-      { 0.50, 0.25 },
-      { 0.75, 0.25 },
-      { 0.00, 0.50 },
-      { 0.25, 0.50 },
-      { 0.50, 0.50 },
-      { 0.75, 0.50 },
-      { 0.25, 0.75 },
-      { 0.50, 0.75 }
+      { 0.25+B, 0.00+B },
+      { 0.50+B, 0.00+B },
+      { 0.00+B, 0.25+B },
+      { 0.25+B, 0.25+B },
+      { 0.50+B, 0.25+B },
+      { 0.75+B, 0.25+B },
+      { 0.00+B, 0.50+B },
+      { 0.25+B, 0.50+B },
+      { 0.50+B, 0.50+B },
+      { 0.75+B, 0.50+B },
+      { 0.25+B, 0.75+B },
+      { 0.50+B, 0.75+B }
    };
    const GLfloat x = (GLfloat) winx;
    const GLfloat y = (GLfloat) winy;
@@ -226,23 +227,23 @@ compute_coveragei(const GLfloat v0[3], const GLfloat v1[3],
     */
    static const GLfloat samples[15][2] = {
       /* start with the four corners */
-      { 0.00, 0.00 },
-      { 0.75, 0.00 },
-      { 0.00, 0.75 },
-      { 0.75, 0.75 },
+      { 0.00+B, 0.00+B },
+      { 0.75+B, 0.00+B },
+      { 0.00+B, 0.75+B },
+      { 0.75+B, 0.75+B },
       /* continue with interior samples */
-      { 0.25, 0.00 },
-      { 0.50, 0.00 },
-      { 0.00, 0.25 },
-      { 0.25, 0.25 },
-      { 0.50, 0.25 },
-      { 0.75, 0.25 },
-      { 0.00, 0.50 },
-      { 0.25, 0.50 },
+      { 0.25+B, 0.00+B },
+      { 0.50+B, 0.00+B },
+      { 0.00+B, 0.25+B },
+      { 0.25+B, 0.25+B },
+      { 0.50+B, 0.25+B },
+      { 0.75+B, 0.25+B },
+      { 0.00+B, 0.50+B },
+      { 0.25+B, 0.50+B },
       /*{ 0.50, 0.50 },*/
-      { 0.75, 0.50 },
-      { 0.25, 0.75 },
-      { 0.50, 0.75 }
+      { 0.75+B, 0.50+B },
+      { 0.25+B, 0.75+B },
+      { 0.50+B, 0.75+B }
    };
    const GLfloat x = (GLfloat) winx;
    const GLfloat y = (GLfloat) winy;