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fix float->int Z calculation in _mesa_span_default_z()

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This commit is contained in:
Brian Paul 2002-11-09 21:28:41 +00:00
parent e307931314
commit ad8cd6111e
1 changed files with 5 additions and 5 deletions
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10
src/mesa/swrast/s_span.c
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@ -1,8 +1,8 @@
/* $Id: s_span.c,v 1.51 2002/10/30 19:49:30 brianp Exp $ */
/* $Id: s_span.c,v 1.52 2002/11/09 21:28:41 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
* Version: 5.0
*
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
*
@ -60,9 +60,9 @@ void
_mesa_span_default_z( GLcontext *ctx, struct sw_span *span )
{
if (ctx->Visual.depthBits <= 16)
span->z = FloatToFixed(ctx->Current.RasterPos[2] * ctx->DepthMax);
span->z = FloatToFixed(ctx->Current.RasterPos[2] * ctx->DepthMax + 0.5F);
else
span->z = (GLint) (ctx->Current.RasterPos[2] * ctx->DepthMax);
span->z = (GLint) (ctx->Current.RasterPos[2] * ctx->DepthMax + 0.5F);
span->zStep = 0;
span->interpMask |= SPAN_Z;
}
@ -267,7 +267,7 @@ _mesa_span_interpolate_z( const GLcontext *ctx, struct sw_span *span )
if (ctx->Visual.depthBits <= 16) {
GLfixed zval = span->z;
GLdepth *z = span->array->z;
for (i = 0; i < n; i++) {
for (i = 0; i < n; i++) {
z[i] = FixedToInt(zval);
zval += span->zStep;
}