mesa: added _mesa_scale_and_bias_depth_uint()

2 files changed, 18 insertions, 0 deletions

diff --git a/src/mesa/main/pixel.c b/src/mesa/main/pixel.c
index eb4fd6e7c9..0e9915dd38 100644
--- a/src/mesa/main/pixel.c
+++ b/src/mesa/main/pixel.c
@@ -1341,6 +1341,21 @@ _mesa_scale_and_bias_depth(const GLcontext *ctx, GLuint n,
 }
 
 
+void
+_mesa_scale_and_bias_depth_uint(const GLcontext *ctx, GLuint n,
+                                GLuint depthValues[])
+{
+   const GLdouble max = (double) 0xffffffff;
+   const GLdouble scale = ctx->Pixel.DepthScale;
+   const GLdouble bias = ctx->Pixel.DepthBias * max;
+   GLuint i;
+   for (i = 0; i < n; i++) {
+      GLdouble d = (GLdouble) depthValues[i] * scale + bias;
+      d = CLAMP(d, 0.0, max);
+      depthValues[i] = (GLuint) d;
+   }
+}
+
 
 /**********************************************************************/
 /*****                    State Management                        *****/
diff --git a/src/mesa/main/pixel.h b/src/mesa/main/pixel.h
index 09155cfd70..3ba5b6689a 100644
--- a/src/mesa/main/pixel.h
+++ b/src/mesa/main/pixel.h
@@ -116,6 +116,9 @@ extern void
 _mesa_scale_and_bias_depth(const GLcontext *ctx, GLuint n,
                            GLfloat depthValues[]);
 
+extern void
+_mesa_scale_and_bias_depth_uint(const GLcontext *ctx, GLuint n,
+                                GLuint depthValues[]);
 
 extern void 
 _mesa_update_pixel( GLcontext *ctx, GLuint newstate );