added _mesa_scale_and_bias_depth()

2 files changed, 20 insertions, 2 deletions

diff --git a/src/mesa/main/pixel.c b/src/mesa/main/pixel.c
index e8912c70029..1f7bfc8bb8a 100644
--- a/src/mesa/main/pixel.c
+++ b/src/mesa/main/pixel.c
@@ -1838,6 +1838,19 @@ _mesa_map_stencil( const GLcontext *ctx, GLuint n, GLstencil stencil[] )
 }
 
 
+void
+_mesa_scale_and_bias_depth(const GLcontext *ctx, GLuint n,
+                           GLfloat depthValues[])
+{
+   const GLfloat scale = ctx->Pixel.DepthScale;
+   const GLfloat bias = ctx->Pixel.DepthBias;
+   GLuint i;
+   for (i = 0; i < n; i++) {
+      GLfloat d = depthValues[i] * scale + bias;
+      depthValues[i] = CLAMP(d, 0.0F, 1.0F);
+   }
+}
+
 
 /*
  * This function converts an array of GLchan colors to GLfloat colors.
diff --git a/src/mesa/main/pixel.h b/src/mesa/main/pixel.h
index 9eef0cff5af..161990024b9 100644
--- a/src/mesa/main/pixel.h
+++ b/src/mesa/main/pixel.h
@@ -5,9 +5,9 @@
 
 /*
  * Mesa 3-D graphics library
- * Version:  6.3
+ * Version:  6.5
  *
- * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -138,6 +138,11 @@ _mesa_map_stencil(const GLcontext *ctx, GLuint n, GLstencil index[]);
 
 
 extern void
+_mesa_scale_and_bias_depth(const GLcontext *ctx, GLuint n,
+                           GLfloat depthValues[]);
+
+
+extern void
 _mesa_chan_to_float_span(const GLcontext *ctx, GLuint n,
                          CONST GLchan rgba[][4], GLfloat rgbaf[][4]);