From ac3ec5096a760daabb1f2be7400bd9723e5058a5 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 28 Sep 2005 02:27:22 +0000
Subject: added _mesa_scale_and_bias_depth()

---
 src/mesa/main/pixel.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/mesa/main/pixel.c')

diff --git a/src/mesa/main/pixel.c b/src/mesa/main/pixel.c
index e8912c7002..1f7bfc8bb8 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.
-- 
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