From 0fd679a1903d997b53fe20b86821a58c1a66262f Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Thu, 22 Nov 2007 09:31:16 -0700
Subject: Consolidate point size computation, clamping in get_size().

Also, apply user-defined clamp limits to point size even when not using
attentuation or program-computed size.
---
 src/mesa/swrast/s_points.c | 71 +++++++++++++++++++++++-----------------------
 1 file changed, 35 insertions(+), 36 deletions(-)

(limited to 'src/mesa/swrast')

diff --git a/src/mesa/swrast/s_points.c b/src/mesa/swrast/s_points.c
index ce73365a4e..dd664b980e 100644
--- a/src/mesa/swrast/s_points.c
+++ b/src/mesa/swrast/s_points.c
@@ -46,6 +46,38 @@
    } while(0)
 
 
+
+/**
+ * Get/compute the point size.
+ * The size may come from a vertex shader, or computed with attentuation
+ * or just the glPointSize value.
+ * Must also clamp to user-defined range and implmentation limits.
+ */
+static INLINE GLfloat
+get_size(const GLcontext *ctx, const SWvertex *vert, GLboolean smoothed)
+{
+   GLfloat size;
+
+   if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled) {
+      /* use vertex's point size */
+      size = vert->pointSize;
+   }
+   else {
+      /* use constant point size */
+      size = ctx->Point.Size;
+   }
+   /* always clamp to user-specified limits */
+   size = CLAMP(size, ctx->Point.MinSize, ctx->Point.MaxSize);
+   /* clamp to implementation limits */
+   if (smoothed)
+      size = CLAMP(size, ctx->Const.MinPointSizeAA, ctx->Const.MaxPointSizeAA);
+   else
+      size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize);
+
+   return size;
+}
+
+
 /**
  * Draw a point sprite
  */
@@ -68,18 +100,7 @@ sprite_point(GLcontext *ctx, const SWvertex *vert)
       span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
    span.zStep = 0;
 
-   /* compute size */
-   if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled) {
-      /* use vertex's point size */
-      /* first, clamp attenuated size to the user-specifed range */
-      size = CLAMP(vert->pointSize, ctx->Point.MinSize, ctx->Point.MaxSize);
-   }
-   else {
-      /* use constant point size */
-      size = ctx->Point.Size;
-   }
-   /* clamp to non-AA implementation limits */
-   size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize);
+   size = get_size(ctx, vert, GL_FALSE);
 
    /* span init */
    INIT_SPAN(span, GL_POINT);
@@ -237,18 +258,7 @@ smooth_point(GLcontext *ctx, const SWvertex *vert)
       span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
    span.zStep = 0;
 
-   /* compute size */
-   if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled) {
-      /* use vertex's point size */
-      /* first, clamp attenuated size to the user-specifed range */
-      size = CLAMP(vert->pointSize, ctx->Point.MinSize, ctx->Point.MaxSize);
-   }
-   else {
-      /* use constant point size */
-      size = ctx->Point.Size;
-   }
-   /* clamp to AA implementation limits */
-   size = CLAMP(size, ctx->Const.MinPointSizeAA, ctx->Const.MaxPointSizeAA);
+   size = get_size(ctx, vert, GL_TRUE);
 
    /* alpha attenuation / fade factor */
    if (ctx->Multisample.Enabled) {
@@ -371,18 +381,7 @@ large_point(GLcontext *ctx, const SWvertex *vert)
       span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
    span.zStep = 0;
 
-   /* compute size */
-   if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled) {
-      /* use vertex's point size */
-      /* first, clamp attenuated size to the user-specifed range */
-      size = CLAMP(vert->pointSize, ctx->Point.MinSize, ctx->Point.MaxSize);
-   }
-   else {
-      /* use constant point size */
-      size = ctx->Point.Size;
-   }
-   /* clamp to non-AA implementation limits */
-   size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize);
+   size = get_size(ctx, vert, GL_FALSE);
 
    /* span init */
    INIT_SPAN(span, GL_POINT);
-- 
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