Moved the software rasterizer to a new directory.

1 files changed, 1 insertions, 1267 deletions

diff --git a/src/mesa/main/stencil.c b/src/mesa/main/stencil.c
index 2dcecced56..93a8303492 100644
--- a/src/mesa/main/stencil.c
+++ b/src/mesa/main/stencil.c
@@ -1,4 +1,4 @@
-/* $Id: stencil.c,v 1.21 2000/10/30 13:32:01 keithw Exp $ */
+/* $Id: stencil.c,v 1.22 2000/10/31 18:09:45 keithw Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -33,7 +33,6 @@
 #include "depth.h"
 #include "macros.h"
 #include "mem.h"
-#include "pb.h"
 #include "stencil.h"
 #include "types.h"
 #include "enable.h"
@@ -181,1268 +180,3 @@ _mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
    }
 }
 
-
-
-/* Stencil Logic:
-
-IF stencil test fails THEN
-   Apply fail-op to stencil value   
-   Don't write the pixel (RGBA,Z)
-ELSE
-   IF doing depth test && depth test fails THEN
-      Apply zfail-op to stencil value   
-      Write RGBA and Z to appropriate buffers
-   ELSE
-      Apply zpass-op to stencil value
-ENDIF
-
-*/
-
-
-
-
-/*
- * Return the address of a stencil buffer value given the window coords:
- */
-#define STENCIL_ADDRESS(X,Y)  \
-       (ctx->DrawBuffer->Stencil + ctx->DrawBuffer->Width * (Y) + (X))
-
-
-
-/*
- * Apply the given stencil operator to the array of stencil values.
- * Don't touch stencil[i] if mask[i] is zero.
- * Input:  n - size of stencil array
- *         oper - the stencil buffer operator
- *         stencil - array of stencil values
- *         mask - array [n] of flag:  1=apply operator, 0=don't apply operator
- * Output:  stencil - modified values
- */
-static void apply_stencil_op( const GLcontext *ctx, GLenum oper,
-                              GLuint n, GLstencil stencil[],
-                              const GLubyte mask[] )
-{
-   const GLstencil ref = ctx->Stencil.Ref;
-   const GLstencil wrtmask = ctx->Stencil.WriteMask;
-   const GLstencil invmask = (GLstencil) (~ctx->Stencil.WriteMask);
-   GLuint i;
-
-   switch (oper) {
-      case GL_KEEP:
-         /* do nothing */
-         break;
-      case GL_ZERO:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  stencil[i] = 0;
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  stencil[i] = (GLstencil) (stencil[i] & invmask);
-	       }
-	    }
-	 }
-	 break;
-      case GL_REPLACE:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  stencil[i] = ref;
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  GLstencil s = stencil[i];
-		  stencil[i] = (GLstencil) ((invmask & s ) | (wrtmask & ref));
-	       }
-	    }
-	 }
-	 break;
-      case GL_INCR:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  GLstencil s = stencil[i];
-		  if (s < STENCIL_MAX) {
-		     stencil[i] = (GLstencil) (s+1);
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  /* VERIFY logic of adding 1 to a write-masked value */
-		  GLstencil s = stencil[i];
-		  if (s < STENCIL_MAX) {
-		     stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s+1)));
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_DECR:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  GLstencil s = stencil[i];
-		  if (s>0) {
-		     stencil[i] = (GLstencil) (s-1);
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  /* VERIFY logic of subtracting 1 to a write-masked value */
-		  GLstencil s = stencil[i];
-		  if (s>0) {
-		     stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s-1)));
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_INCR_WRAP_EXT:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  stencil[i]++;
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil s = stencil[i];
-                  stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s+1)));
-	       }
-	    }
-	 }
-	 break;
-      case GL_DECR_WRAP_EXT:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  stencil[i]--;
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil s = stencil[i];
-                  stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s-1)));
-	       }
-	    }
-	 }
-	 break;
-      case GL_INVERT:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  GLstencil s = stencil[i];
-		  stencil[i] = (GLstencil) ~s;
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  GLstencil s = stencil[i];
-		  stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & ~s));
-	       }
-	    }
-	 }
-	 break;
-      default:
-         gl_problem(ctx, "Bad stencil op in apply_stencil_op");
-   }
-}
-
-
-
-
-/*
- * Apply stencil test to an array of stencil values (before depth buffering).
- * Input:  n - number of pixels in the array
- *         stencil - array of [n] stencil values
- *         mask - array [n] of flag:  0=skip the pixel, 1=stencil the pixel
- * Output:  mask - pixels which fail the stencil test will have their
- *                 mask flag set to 0.
- *          stencil - updated stencil values (where the test passed)
- * Return:  GL_FALSE = all pixels failed, GL_TRUE = zero or more pixels passed.
- */
-static GLboolean
-do_stencil_test( GLcontext *ctx, GLuint n, GLstencil stencil[],
-                 GLubyte mask[] )
-{
-   GLubyte fail[PB_SIZE];
-   GLboolean allfail = GL_FALSE;
-   GLuint i;
-   GLstencil r, s;
-
-   ASSERT(n <= PB_SIZE);
-
-   /*
-    * Perform stencil test.  The results of this operation are stored
-    * in the fail[] array:
-    *   IF fail[i] is non-zero THEN
-    *       the stencil fail operator is to be applied
-    *   ELSE
-    *       the stencil fail operator is not to be applied
-    *   ENDIF
-    */
-   switch (ctx->Stencil.Function) {
-      case GL_NEVER:
-         /* always fail */
-         for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       mask[i] = 0;
-	       fail[i] = 1;
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 allfail = GL_TRUE;
-	 break;
-      case GL_LESS:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       s = (GLstencil) (stencil[i] & ctx->Stencil.ValueMask);
-	       if (r < s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_LEQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       s = (GLstencil) (stencil[i] & ctx->Stencil.ValueMask);
-	       if (r <= s) {
-		  /* pass */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_GREATER:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       s = (GLstencil) (stencil[i] & ctx->Stencil.ValueMask);
-	       if (r > s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_GEQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       s = (GLstencil) (stencil[i] & ctx->Stencil.ValueMask);
-	       if (r >= s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_EQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       s = (GLstencil) (stencil[i] & ctx->Stencil.ValueMask);
-	       if (r == s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_NOTEQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       s = (GLstencil) (stencil[i] & ctx->Stencil.ValueMask);
-	       if (r != s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_ALWAYS:
-	 /* always pass */
-	 for (i=0;i<n;i++) {
-	    fail[i] = 0;
-	 }
-	 break;
-      default:
-         gl_problem(ctx, "Bad stencil func in gl_stencil_span");
-         return 0;
-   }
-
-   if (ctx->Stencil.FailFunc != GL_KEEP) {
-      apply_stencil_op( ctx, ctx->Stencil.FailFunc, n, stencil, fail );
-   }
-
-   return !allfail;
-}
-
-
-
-
-/*
- * Apply stencil and depth testing to an array of pixels.
- * Hardware or software stencil buffer acceptable.
- * Input:  n - number of pixels in the span
- *         z - array [n] of z values
- *         stencil - array [n] of stencil values
- *         mask - array [n] of flags  (1=test this pixel, 0=skip the pixel)
- * Output:  stencil - modified stencil values
- *          mask - array [n] of flags (1=stencil and depth test passed)
- * Return: GL_TRUE - all fragments failed the testing
- *         GL_FALSE - one or more fragments passed the testing
- * 
- */
-static GLboolean
-stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
-                        const GLdepth z[], GLstencil stencil[],
-                        GLubyte mask[] )
-{
-   ASSERT(ctx->Stencil.Enabled);
-   ASSERT(n <= PB_SIZE);
-
-   /*
-    * Apply the stencil test to the fragments.
-    * failMask[i] is 1 if the stencil test failed.
-    */
-   if (do_stencil_test( ctx, n, stencil, mask ) == GL_FALSE) {
-      /* all fragments failed the stencil test, we're done. */
-      return GL_FALSE;
-   }
-
-
-   /*
-    * Some fragments passed the stencil test, apply depth test to them
-    * and apply Zpass and Zfail stencil ops.
-    */
-   if (ctx->Depth.Test==GL_FALSE) {
-      /*
-       * No depth buffer, just apply zpass stencil function to active pixels.
-       */
-      apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, mask );
-   }
-   else {
-      /*
-       * Perform depth buffering, then apply zpass or zfail stencil function.
-       */
-      GLubyte passmask[MAX_WIDTH], failmask[MAX_WIDTH], oldmask[MAX_WIDTH];
-      GLuint i;
-
-      /* save the current mask bits */
-      MEMCPY(oldmask, mask, n * sizeof(GLubyte));
-
-      /* apply the depth test */
-      _mesa_depth_test_span(ctx, n, x, y, z, mask);
-
-      /* Set the stencil pass/fail flags according to result of depth testing.
-       * if oldmask[i] == 0 then
-       *    Don't touch the stencil value
-       * else if oldmask[i] and newmask[i] then
-       *    Depth test passed
-       * else
-       *    assert(oldmask[i] && !newmask[i])
-       *    Depth test failed
-       * endif
-       */
-      for (i=0;i<n;i++) {
-         ASSERT(mask[i] == 0 || mask[i] == 1);
-         passmask[i] = oldmask[i] & mask[i];
-         failmask[i] = oldmask[i] & (mask[i] ^ 1);
-      }
-
-      /* apply the pass and fail operations */
-      if (ctx->Stencil.ZFailFunc != GL_KEEP) {
-         apply_stencil_op( ctx, ctx->Stencil.ZFailFunc, n, stencil, failmask );
-      }
-      if (ctx->Stencil.ZPassFunc != GL_KEEP) {
-         apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, passmask );
-      }
-   }
-
-   return GL_TRUE;  /* one or more fragments passed both tests */
-}
-
-
-
-/*
- * Apply stencil and depth testing to the span of pixels.
- * Both software and hardware stencil buffers are acceptable.
- * Input:  n - number of pixels in the span
- *         x, y - location of leftmost pixel in span
- *         z - array [n] of z values
- *         mask - array [n] of flags  (1=test this pixel, 0=skip the pixel)
- * Output:  mask - array [n] of flags (1=stencil and depth test passed)
- * Return: GL_TRUE - all fragments failed the testing
- *         GL_FALSE - one or more fragments passed the testing
- * 
- */
-GLboolean
-_mesa_stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
-                              const GLdepth z[], GLubyte mask[] )
-{
-   GLstencil stencilRow[MAX_WIDTH];
-   GLstencil *stencil;
-   GLboolean result;
-
-   ASSERT(ctx->Stencil.Enabled);
-   ASSERT(n <= MAX_WIDTH);
-
-   /* Get initial stencil values */
-   if (ctx->Driver.WriteStencilSpan) {
-      ASSERT(ctx->Driver.ReadStencilSpan);
-      /* Get stencil values from the hardware stencil buffer */
-      (*ctx->Driver.ReadStencilSpan)(ctx, n, x, y, stencilRow);
-      stencil = stencilRow;
-   }
-   else {
-      /* software stencil buffer */
-      stencil = STENCIL_ADDRESS(x, y);
-   }
-
-   /* do all the stencil/depth testing/updating */
-   result = stencil_and_ztest_span( ctx, n, x, y, z, stencil, mask );
-
-   if (ctx->Driver.WriteStencilSpan) {
-      /* Write updated stencil values into hardware stencil buffer */
-      (ctx->Driver.WriteStencilSpan)(ctx, n, x, y, stencil, mask );
-   }
-
-   return result;
-}
-
-
-
-
-/*
- * Apply the given stencil operator for each pixel in the array whose
- * mask flag is set.  This is for software stencil buffers only.
- * Input:  n - number of pixels in the span
- *         x, y - array of [n] pixels
- *         operator - the stencil buffer operator
- *         mask - array [n] of flag:  1=apply operator, 0=don't apply operator
- */
-static void
-apply_stencil_op_to_pixels( const GLcontext *ctx,
-                            GLuint n, const GLint x[], const GLint y[],
-                            GLenum oper, const GLubyte mask[] )
-{
-   const GLstencil ref = ctx->Stencil.Ref;
-   const GLstencil wrtmask = ctx->Stencil.WriteMask;
-   const GLstencil invmask = (GLstencil) (~ctx->Stencil.WriteMask);
-   GLuint i;
-
-   ASSERT(!ctx->Driver.WriteStencilSpan);  /* software stencil buffer only! */
-
-   switch (oper) {
-      case GL_KEEP:
-         /* do nothing */
-         break;
-      case GL_ZERO:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = 0;
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-		  *sptr = (GLstencil) (invmask & *sptr);
-	       }
-	    }
-	 }
-	 break;
-      case GL_REPLACE:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = ref;
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-		  *sptr = (GLstencil) ((invmask & *sptr ) | (wrtmask & ref));
-	       }
-	    }
-	 }
-	 break;
-      case GL_INCR:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-		  if (*sptr < STENCIL_MAX) {
-		     *sptr = (GLstencil) (*sptr + 1);
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-		  if (*sptr < STENCIL_MAX) {
-		     *sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr+1)));
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_DECR:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-		  if (*sptr>0) {
-		     *sptr = (GLstencil) (*sptr - 1);
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-		  if (*sptr>0) {
-		     *sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr-1)));
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_INCR_WRAP_EXT:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = (GLstencil) (*sptr + 1);
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr+1)));
-	       }
-	    }
-	 }
-	 break;
-      case GL_DECR_WRAP_EXT:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = (GLstencil) (*sptr - 1);
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr-1)));
-	       }
-	    }
-	 }
-	 break;
-      case GL_INVERT:
-	 if (invmask==0) {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = (GLstencil) (~*sptr);
-	       }
-	    }
-	 }
-	 else {
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-                  GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
-                  *sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & ~*sptr));
-	       }
-	    }
-	 }
-	 break;
-      default:
-         gl_problem(ctx, "Bad stencilop in apply_stencil_op_to_pixels");
-   }
-}
-
-
-
-/*
- * Apply stencil test to an array of pixels before depth buffering.
- * Used for software stencil buffer only.
- * Input:  n - number of pixels in the span
- *         x, y - array of [n] pixels to stencil
- *         mask - array [n] of flag:  0=skip the pixel, 1=stencil the pixel
- * Output:  mask - pixels which fail the stencil test will have their
- *                 mask flag set to 0.
- * Return:  0 = all pixels failed, 1 = zero or more pixels passed.
- */
-static GLboolean
-stencil_test_pixels( GLcontext *ctx, GLuint n,
-                     const GLint x[], const GLint y[], GLubyte mask[] )
-{
-   GLubyte fail[PB_SIZE];
-   GLstencil r, s;
-   GLuint i;
-   GLboolean allfail = GL_FALSE;
-
-   ASSERT(!ctx->Driver.WriteStencilSpan);  /* software stencil buffer only! */
-
-   /*
-    * Perform stencil test.  The results of this operation are stored
-    * in the fail[] array:
-    *   IF fail[i] is non-zero THEN
-    *       the stencil fail operator is to be applied
-    *   ELSE
-    *       the stencil fail operator is not to be applied
-    *   ENDIF
-    */
-
-   switch (ctx->Stencil.Function) {
-      case GL_NEVER:
-         /* always fail */
-         for (i=0;i<n;i++) {
-	    if (mask[i]) {
-	       mask[i] = 0;
-	       fail[i] = 1;
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 allfail = GL_TRUE;
-	 break;
-      case GL_LESS:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-               GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
-	       s = (GLstencil) (*sptr & ctx->Stencil.ValueMask);
-	       if (r < s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_LEQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-               GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
-	       s = (GLstencil) (*sptr & ctx->Stencil.ValueMask);
-	       if (r <= s) {
-		  /* pass */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_GREATER:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-               GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
-	       s = (GLstencil) (*sptr & ctx->Stencil.ValueMask);
-	       if (r > s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_GEQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-               GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
-	       s = (GLstencil) (*sptr & ctx->Stencil.ValueMask);
-	       if (r >= s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_EQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-               GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
-	       s = (GLstencil) (*sptr & ctx->Stencil.ValueMask);
-	       if (r == s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_NOTEQUAL:
-	 r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask);
-	 for (i=0;i<n;i++) {
-	    if (mask[i]) {
-               GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
-	       s = (GLstencil) (*sptr & ctx->Stencil.ValueMask);
-	       if (r != s) {
-		  /* passed */
-		  fail[i] = 0;
-	       }
-	       else {
-		  fail[i] = 1;
-		  mask[i] = 0;
-	       }
-	    }
-	    else {
-	       fail[i] = 0;
-	    }
-	 }
-	 break;
-      case GL_ALWAYS:
-	 /* always pass */
-	 for (i=0;i<n;i++) {
-	    fail[i] = 0;
-	 }
-	 break;
-      default:
-         gl_problem(ctx, "Bad stencil func in gl_stencil_pixels");
-         return 0;
-   }
-
-   if (ctx->Stencil.FailFunc != GL_KEEP) {
-      apply_stencil_op_to_pixels( ctx, n, x, y, ctx->Stencil.FailFunc, fail );
-   }
-
-   return !allfail;
-}
-
-
-
-
-/*
- * Apply stencil and depth testing to an array of pixels.
- * This is used both for software and hardware stencil buffers.
- *
- * The comments in this function are a bit sparse but the code is
- * almost identical to stencil_and_ztest_span(), which is well
- * commented.
- * 
- * Input:  n - number of pixels in the array
- *         x, y - array of [n] pixel positions
- *         z - array [n] of z values
- *         mask - array [n] of flags  (1=test this pixel, 0=skip the pixel)
- * Output: mask - array [n] of flags (1=stencil and depth test passed)
- * Return: GL_TRUE - all fragments failed the testing
- *         GL_FALSE - one or more fragments passed the testing
- */
-GLboolean
-_mesa_stencil_and_ztest_pixels( GLcontext *ctx,
-                                GLuint n, const GLint x[], const GLint y[],
-                                const GLdepth z[], GLubyte mask[] )
-{
-   ASSERT(ctx->Stencil.Enabled);
-   ASSERT(n <= PB_SIZE);
-
-   if (ctx->Driver.WriteStencilPixels) {
-      /*** Hardware stencil buffer ***/
-      GLstencil stencil[PB_SIZE];
-      GLubyte mask[PB_SIZE];
-
-      ASSERT(ctx->Driver.ReadStencilPixels);
-      (*ctx->Driver.ReadStencilPixels)(ctx, n, x, y, stencil);
-
-
-      if (do_stencil_test( ctx, n, stencil, mask ) == GL_FALSE) {
-         /* all fragments failed the stencil test, we're done. */
-         return GL_FALSE;
-      }
-
-      if (ctx->Depth.Test == GL_FALSE) {
-         apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, mask );
-      }
-      else {
-         GLubyte passmask[PB_SIZE], failmask[PB_SIZE], oldmask[PB_SIZE];
-         GLuint i;
-
-         MEMCPY(oldmask, mask, n * sizeof(GLubyte));
-
-         _mesa_depth_test_pixels(ctx, n, x, y, z, mask);
-
-         for (i=0;i<n;i++) {
-            ASSERT(mask[i] == 0 || mask[i] == 1);
-            passmask[i] = oldmask[i] & mask[i];
-            failmask[i] = oldmask[i] & (mask[i] ^ 1);
-         }
-
-         if (ctx->Stencil.ZFailFunc != GL_KEEP) {
-            apply_stencil_op( ctx, ctx->Stencil.ZFailFunc, n, stencil, failmask );
-         }
-         if (ctx->Stencil.ZPassFunc != GL_KEEP) {
-            apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, passmask );
-         }
-      }
-
-      /* Write updated stencil values into hardware stencil buffer */
-      (ctx->Driver.WriteStencilPixels)(ctx, n, x, y, stencil, mask );
-
-      return GL_TRUE;
-
-   }
-   else {
-      /*** Software stencil buffer ***/
-
-      if (stencil_test_pixels(ctx, n, x, y, mask) == GL_FALSE) {
-         /* all fragments failed the stencil test, we're done. */
-         return GL_FALSE;
-      }
-
-
-      if (ctx->Depth.Test==GL_FALSE) {
-         apply_stencil_op_to_pixels( ctx, n, x, y, ctx->Stencil.ZPassFunc, mask );
-      }
-      else {
-         GLubyte passmask[PB_SIZE], failmask[PB_SIZE], oldmask[PB_SIZE];
-         GLuint i;
-
-         MEMCPY(oldmask, mask, n * sizeof(GLubyte));
-
-         _mesa_depth_test_pixels(ctx, n, x, y, z, mask);
-
-         for (i=0;i<n;i++) {
-            ASSERT(mask[i] == 0 || mask[i] == 1);
-            passmask[i] = oldmask[i] & mask[i];
-            failmask[i] = oldmask[i] & (mask[i] ^ 1);
-         }
-
-         if (ctx->Stencil.ZFailFunc != GL_KEEP) {
-            apply_stencil_op_to_pixels( ctx, n, x, y,
-                                        ctx->Stencil.ZFailFunc, failmask );
-         }
-         if (ctx->Stencil.ZPassFunc != GL_KEEP) {
-            apply_stencil_op_to_pixels( ctx, n, x, y,
-                                        ctx->Stencil.ZPassFunc, passmask );
-         }
-      }
-
-      return GL_TRUE;  /* one or more fragments passed both tests */
-   }
-}
-
-
-
-/*
- * Return a span of stencil values from the stencil buffer.
- * Used for glRead/CopyPixels
- * Input:  n - how many pixels
- *         x,y - location of first pixel
- * Output:  stencil - the array of stencil values
- */
-void
-_mesa_read_stencil_span( GLcontext *ctx,
-                         GLint n, GLint x, GLint y, GLstencil stencil[] )
-{
-   if (y < 0 || y >= ctx->DrawBuffer->Height ||
-       x + n <= 0 || x >= ctx->DrawBuffer->Width) {
-      /* span is completely outside framebuffer */
-      return; /* undefined values OK */
-   }
-
-   if (x < 0) {
-      GLint dx = -x;
-      x = 0;
-      n -= dx;
-      stencil += dx;
-   }
-   if (x + n > ctx->DrawBuffer->Width) {
-      GLint dx = x + n - ctx->DrawBuffer->Width;
-      n -= dx;
-   }
-   if (n <= 0) {
-      return;
-   }
-
-
-   ASSERT(n >= 0);
-   if (ctx->Driver.ReadStencilSpan) {
-      (*ctx->Driver.ReadStencilSpan)( ctx, (GLuint) n, x, y, stencil );
-   }
-   else if (ctx->DrawBuffer->Stencil) {
-      const GLstencil *s = STENCIL_ADDRESS( x, y );
-#if STENCIL_BITS == 8
-      MEMCPY( stencil, s, n * sizeof(GLstencil) );
-#else
-      GLuint i;
-      for (i=0;i<n;i++)
-         stencil[i] = s[i];
-#endif
-   }
-}
-
-
-
-/*
- * Write a span of stencil values to the stencil buffer.
- * Used for glDraw/CopyPixels
- * Input:  n - how many pixels
- *         x, y - location of first pixel
- *         stencil - the array of stencil values
- */
-void
-_mesa_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
-                          const GLstencil stencil[] )
-{
-   if (y < 0 || y >= ctx->DrawBuffer->Height ||
-       x + n <= 0 || x >= ctx->DrawBuffer->Width) {
-      /* span is completely outside framebuffer */
-      return; /* undefined values OK */
-   }
-
-   if (x < 0) {
-      GLint dx = -x;
-      x = 0;
-      n -= dx;
-      stencil += dx;
-   }
-   if (x + n > ctx->DrawBuffer->Width) {
-      GLint dx = x + n - ctx->DrawBuffer->Width;
-      n -= dx;
-   }
-   if (n <= 0) {
-      return;
-   }
-
-   if (ctx->Driver.WriteStencilSpan) {
-      (*ctx->Driver.WriteStencilSpan)( ctx, n, x, y, stencil, NULL );
-   }
-   else if (ctx->DrawBuffer->Stencil) {
-      GLstencil *s = STENCIL_ADDRESS( x, y );
-#if STENCIL_BITS == 8
-      MEMCPY( s, stencil, n * sizeof(GLstencil) );
-#else
-      GLuint i;
-      for (i=0;i<n;i++)
-         s[i] = stencil[i];
-#endif
-   }
-}
-
-
-
-/*
- * Allocate a new stencil buffer.  If there's an old one it will be
- * deallocated first.  The new stencil buffer will be uninitialized.
- */
-void
-_mesa_alloc_stencil_buffer( GLcontext *ctx )
-{
-   GLuint buffersize = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
-
-   /* deallocate current stencil buffer if present */
-   if (ctx->DrawBuffer->Stencil) {
-      FREE(ctx->DrawBuffer->Stencil);
-      ctx->DrawBuffer->Stencil = NULL;
-   }
-
-   /* allocate new stencil buffer */
-   ctx->DrawBuffer->Stencil = (GLstencil *) MALLOC(buffersize * sizeof(GLstencil));
-   if (!ctx->DrawBuffer->Stencil) {
-      /* out of memory */
-      _mesa_set_enable( ctx, GL_STENCIL_TEST, GL_FALSE );
-      gl_error( ctx, GL_OUT_OF_MEMORY, "_mesa_alloc_stencil_buffer" );
-   }
-}
-
-
-
-/*
- * Clear the software (malloc'd) stencil buffer.
- */
-static void
-clear_software_stencil_buffer( GLcontext *ctx )
-{
-   if (ctx->Visual.StencilBits==0 || !ctx->DrawBuffer->Stencil) {
-      /* no stencil buffer */
-      return;
-   }
-
-   if (ctx->Scissor.Enabled) {
-      /* clear scissor region only */
-      const GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin;
-      if (ctx->Stencil.WriteMask != STENCIL_MAX) {
-         /* must apply mask to the clear */
-         GLint y;
-         for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) {
-            const GLstencil mask = ctx->Stencil.WriteMask;
-            const GLstencil invMask = ~mask;
-            const GLstencil clearVal = (ctx->Stencil.Clear & mask);
-            GLstencil *stencil = STENCIL_ADDRESS( ctx->DrawBuffer->Xmin, y );
-            GLint i;
-            for (i = 0; i < width; i++) {
-               stencil[i] = (stencil[i] & invMask) | clearVal;
-            }
-         }
-      }
-      else {
-         /* no masking */
-         GLint y;
-         for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) {
-            GLstencil *stencil = STENCIL_ADDRESS( ctx->DrawBuffer->Xmin, y );
-#if STENCIL_BITS==8
-            MEMSET( stencil, ctx->Stencil.Clear, width * sizeof(GLstencil) );
-#else
-            GLint i;
-            for (i = 0; i < width; i++)
-               stencil[x] = ctx->Stencil.Clear;
-#endif
-         }
-      }
-   }
-   else {
-      /* clear whole stencil buffer */
-      if (ctx->Stencil.WriteMask != STENCIL_MAX) {
-         /* must apply mask to the clear */
-         const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
-         GLstencil *stencil = ctx->DrawBuffer->Stencil;
-         const GLstencil mask = ctx->Stencil.WriteMask;
-         const GLstencil invMask = ~mask;
-         const GLstencil clearVal = (ctx->Stencil.Clear & mask);
-         GLuint i;
-         for (i = 0; i < n; i++) {
-            stencil[i] = (stencil[i] & invMask) | clearVal;
-         }
-      }
-      else {
-         /* clear whole buffer without masking */
-         const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
-         GLstencil *stencil = ctx->DrawBuffer->Stencil;
-
-#if STENCIL_BITS==8
-         MEMSET(stencil, ctx->Stencil.Clear, n * sizeof(GLstencil) );
-#else
-         GLuint i;
-         for (i = 0; i < n; i++) {
-            stencil[i] = ctx->Stencil.Clear;
-         }
-#endif
-      }
-   }
-}
-
-
-
-/*
- * Clear the hardware (in graphics card) stencil buffer.
- * This is done with the Driver.WriteStencilSpan() and Driver.ReadStencilSpan()
- * functions.
- * Actually, if there is a hardware stencil buffer it really should have
- * been cleared in Driver.Clear()!  However, if the hardware does not
- * support scissored clears or masked clears (i.e. glStencilMask) then
- * we have to use the span-based functions.
- */
-static void
-clear_hardware_stencil_buffer( GLcontext *ctx )
-{
-   ASSERT(ctx->Driver.WriteStencilSpan);
-   ASSERT(ctx->Driver.ReadStencilSpan);
-
-   if (ctx->Scissor.Enabled) {
-      /* clear scissor region only */
-      const GLint x = ctx->DrawBuffer->Xmin;
-      const GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin;
-      if (ctx->Stencil.WriteMask != STENCIL_MAX) {
-         /* must apply mask to the clear */
-         GLint y;
-         for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) {
-            const GLstencil mask = ctx->Stencil.WriteMask;
-            const GLstencil invMask = ~mask;
-            const GLstencil clearVal = (ctx->Stencil.Clear & mask);
-            GLstencil stencil[MAX_WIDTH];
-            GLint i;
-            (*ctx->Driver.ReadStencilSpan)(ctx, x, y, width, stencil);
-            for (i = 0; i < width; i++) {
-               stencil[i] = (stencil[i] & invMask) | clearVal;
-            }
-            (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL);
-         }
-      }
-      else {
-         /* no masking */
-         GLstencil stencil[MAX_WIDTH];
-         GLint y, i;
-         for (i = 0; i < width; i++) {
-            stencil[i] = ctx->Stencil.Clear;
-         }
-         for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) {
-            (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL);
-         }
-      }
-   }
-   else {
-      /* clear whole stencil buffer */
-      if (ctx->Stencil.WriteMask != STENCIL_MAX) {
-         /* must apply mask to the clear */
-         const GLstencil mask = ctx->Stencil.WriteMask;
-         const GLstencil invMask = ~mask;
-         const GLstencil clearVal = (ctx->Stencil.Clear & mask);
-         const GLint width = ctx->DrawBuffer->Width;
-         const GLint height = ctx->DrawBuffer->Height;
-         const GLint x = ctx->DrawBuffer->Xmin;
-         GLint y;
-         for (y = 0; y < height; y++) {
-            GLstencil stencil[MAX_WIDTH];
-            GLuint i;
-            (*ctx->Driver.ReadStencilSpan)(ctx, x, y, width, stencil);
-            for (i = 0; i < width; i++) {
-               stencil[i] = (stencil[i] & invMask) | clearVal;
-            }
-            (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL);
-         }
-      }
-      else {
-         /* clear whole buffer without masking */
-         const GLint width = ctx->DrawBuffer->Width;
-         const GLint height = ctx->DrawBuffer->Width;
-         const GLint x = ctx->DrawBuffer->Xmin;
-         GLstencil stencil[MAX_WIDTH];
-         GLint y, i;
-         for (i = 0; i < width; i++) {
-            stencil[i] = ctx->Stencil.Clear;
-         }
-         for (y = 0; y < height; y++) {
-            (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL);
-         }
-      }
-   }
-}
-
-
-
-/*
- * Clear the stencil buffer.
- */
-void
-_mesa_clear_stencil_buffer( GLcontext *ctx )
-{
-   if (ctx->Driver.WriteStencilSpan) {
-      ASSERT(ctx->Driver.ReadStencilSpan);
-      clear_hardware_stencil_buffer(ctx);
-   }
-   else {
-      clear_software_stencil_buffer(ctx);
-   }
-}
-