added stencil buffer functions

src/mesa/main/dd.h

@@ -1,4 +1,4 @@
-/* $Id: dd.h,v 1.6 1999/11/25 17:36:48 brianp Exp $ */
+/* $Id: dd.h,v 1.7 1999/12/10 16:14:40 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -390,6 +390,7 @@ struct dd_function_table {
 
    /***
     *** For supporting hardware Z buffers:
+    *** Either ALL or NONE of these functions must be implemented!
     ***/
 
    void (*AllocDepthBuffer)( GLcontext *ctx );
@@ -420,6 +421,43 @@ struct dd_function_table {
     */
 
 
+   /***
+    *** For supporting hardware stencil buffers:
+    *** Either ALL or NONE of these functions must be implemented!
+    ***/
+
+   void (*WriteStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+                             const GLstencil stencil[],
+                             const GLubyte mask[] );
+   /* Write a horizontal span of stencil values into the stencil buffer.
+    * If mask is NULL, write all stencil values.
+    * Else, only write stencil[i] if mask[i] is non-zero.
+    */
+
+
+   void (*ReadStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+                            GLstencil stencil[] );
+   /* Read a horizontal span of stencil values from the stencil buffer.
+    */
+
+
+   void (*WriteStencilPixels)( GLcontext *ctx, GLuint n,
+                               const GLint x[], const GLint y[],
+                               const GLstencil stencil[],
+                               const GLubyte mask[] );
+   /* Write an array of stencil values into the stencil buffer.
+    * If mask is NULL, write all stencil values.
+    * Else, only write stencil[i] if mask[i] is non-zero.
+    */
+
+   void (*ReadStencilPixels)( GLcontext *ctx, GLuint n,
+                              const GLint x[], const GLint y[],
+                              GLstencil stencil[] );
+   /* Read an array of stencil values from the stencil buffer.
+    */
+  
+
+
    /***
     *** Accelerated point, line, polygon, glDrawPixels and glBitmap functions:
     ***/