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fix precision problem in depth clearing (bug 4395)

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This commit is contained in:
Brian Paul 2005-09-08 13:55:34 +00:00
parent 3f27b6ffeb
commit 5eb129de76
1 changed files with 10 additions and 4 deletions
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14
src/mesa/swrast/s_depth.c
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@ -1,6 +1,6 @@
/*
* Mesa 3-D graphics library
* Version: 6.3
* Version: 6.5
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
*
@ -1273,13 +1273,11 @@ _swrast_read_depth_span_float( GLcontext *ctx, struct gl_renderbuffer *rb,
/**
* Clear the depth buffer.
* XXX this is no longer a swrast function!!!
*/
void
_swrast_clear_depth_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
{
const GLuint clearValue
= (GLuint) (ctx->Depth.Clear * ctx->DrawBuffer->_DepthMaxF);
GLuint clearValue;
GLint x, y, width, height;
if (!rb || !ctx->Depth.Mask) {
@ -1287,6 +1285,14 @@ _swrast_clear_depth_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
return;
}
/* compute integer clearing value */
if (ctx->Depth.Clear == 1.0) {
clearValue = ctx->DrawBuffer->_DepthMax;
}
else {
clearValue = (GLuint) (ctx->Depth.Clear * ctx->DrawBuffer->_DepthMaxF);
}
assert(rb->_BaseFormat == GL_DEPTH_COMPONENT);
/* compute region to clear */