Moved the software rasterizer to a new directory.

1 files changed, 1 insertions, 1601 deletions

diff --git a/src/mesa/main/depth.c b/src/mesa/main/depth.c
index a5d9c34..9689b79 100644
--- a/src/mesa/main/depth.c
+++ b/src/mesa/main/depth.c
@@ -1,4 +1,4 @@
-/* $Id: depth.c,v 1.21 2000/10/30 13:32:00 keithw Exp $ */
+/* $Id: depth.c,v 1.22 2000/10/31 18:09:44 keithw Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -34,7 +34,6 @@
 #include "depth.h"
 #include "macros.h"
 #include "mem.h"
-#include "pb.h"
 #include "types.h"
 #endif
 
@@ -125,1602 +124,3 @@ _mesa_DepthMask( GLboolean flag )
 }
 
 
-
-/**********************************************************************/
-/*****                           Misc                             *****/
-/**********************************************************************/
-
-/*
- * Return address of depth buffer value for given window coord.
- */
-GLvoid *
-_mesa_zbuffer_address(GLcontext *ctx, GLint x, GLint y)
-{
-   if (ctx->Visual.DepthBits <= 16)
-      return (GLushort *) ctx->DrawBuffer->DepthBuffer + ctx->DrawBuffer->Width * y + x;
-   else
-      return (GLuint *) ctx->DrawBuffer->DepthBuffer + ctx->DrawBuffer->Width * y + x;
-}
-
-
-#define Z_ADDRESS16( CTX, X, Y )				\
-            ( ((GLushort *) (CTX)->DrawBuffer->DepthBuffer)	\
-              + (CTX)->DrawBuffer->Width * (Y) + (X) )
-
-#define Z_ADDRESS32( CTX, X, Y )				\
-            ( ((GLuint *) (CTX)->DrawBuffer->DepthBuffer)	\
-              + (CTX)->DrawBuffer->Width * (Y) + (X) )
-
-
-
-/**********************************************************************/
-/*****                   Depth Testing Functions                  *****/
-/**********************************************************************/
-
-
-/*
- * Do depth test for an array of fragments.  This is used both for
- * software and hardware Z buffers.
- * Input:  zbuffer - array of z values in the zbuffer
- *         z - array of fragment z values
- * Return:  number of fragments which pass the test.
- */
-static GLuint
-depth_test_span16( GLcontext *ctx, GLuint n, GLint x, GLint y,
-                   GLushort zbuffer[], const GLdepth z[], GLubyte mask[] )
-{
-   GLuint passed = 0;
-
-   /* switch cases ordered from most frequent to less frequent */
-   switch (ctx->Depth.Func) {
-      case GL_LESS:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] < zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] < zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_LEQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] <= zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] <= zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GEQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] >= zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] >= zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GREATER:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] > zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] > zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_NOTEQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] != zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] != zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_EQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] == zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] == zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_ALWAYS:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  zbuffer[i] = z[i];
-		  passed++;
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer or mask */
-	    passed = n;
-	 }
-	 break;
-      case GL_NEVER:
-         BZERO(mask, n * sizeof(GLubyte));
-	 break;
-      default:
-         gl_problem(ctx, "Bad depth func in depth_test_span16");
-   }
-
-   return passed;
-}
-
-
-static GLuint
-depth_test_span32( GLcontext *ctx, GLuint n, GLint x, GLint y,
-                   GLuint zbuffer[], const GLdepth z[], GLubyte mask[] )
-{
-   GLuint passed = 0;
-
-   /* switch cases ordered from most frequent to less frequent */
-   switch (ctx->Depth.Func) {
-      case GL_LESS:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] < zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] < zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_LEQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] <= zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] <= zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GEQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] >= zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] >= zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GREATER:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] > zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] > zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_NOTEQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] != zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] != zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_EQUAL:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] == zbuffer[i]) {
-		     zbuffer[i] = z[i];
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  if (z[i] == zbuffer[i]) {
-		     /* pass */
-		     passed++;
-		  }
-		  else {
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_ALWAYS:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0;i<n;i++) {
-	       if (mask[i]) {
-		  zbuffer[i] = z[i];
-		  passed++;
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer or mask */
-	    passed = n;
-	 }
-	 break;
-      case GL_NEVER:
-         BZERO(mask, n * sizeof(GLubyte));
-	 break;
-      default:
-         gl_problem(ctx, "Bad depth func in depth_test_span32");
-   }
-
-   return passed;
-}
-
-
-
-/*
- * Apply depth test to span of fragments.  Hardware or software z buffer.
- */
-GLuint
-_mesa_depth_test_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
-                       const GLdepth z[], GLubyte mask[] )
-{
-   if (ctx->Driver.ReadDepthSpan) {
-      /* hardware-based depth buffer */
-      GLdepth zbuffer[MAX_WIDTH];
-      GLuint passed;
-      (*ctx->Driver.ReadDepthSpan)(ctx, n, x, y, zbuffer);
-      passed = depth_test_span32(ctx, n, x, y, zbuffer, z, mask);
-      assert(ctx->Driver.WriteDepthSpan);
-      (*ctx->Driver.WriteDepthSpan)(ctx, n, x, y, zbuffer, mask);
-      return passed;
-   }
-   else {
-      /* software depth buffer */
-      if (ctx->Visual.DepthBits <= 16) {
-         GLushort *zptr = (GLushort *) Z_ADDRESS16(ctx, x, y);
-         GLuint passed = depth_test_span16(ctx, n, x, y, zptr, z, mask);
-         return passed;
-      }
-      else {
-         GLuint *zptr = (GLuint *) Z_ADDRESS32(ctx, x, y);
-         GLuint passed = depth_test_span32(ctx, n, x, y, zptr, z, mask);
-         return passed;
-      }
-   }
-}
-
-
-
-
-/*
- * Do depth testing for an array of fragments using software Z buffer.
- */
-static void
-software_depth_test_pixels16( GLcontext *ctx, GLuint n,
-                              const GLint x[], const GLint y[],
-                              const GLdepth z[], GLubyte mask[] )
-{
-   /* switch cases ordered from most frequent to less frequent */
-   switch (ctx->Depth.Func) {
-      case GL_LESS:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] < *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] < *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_LEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] <= *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] <= *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] >= *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] >= *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GREATER:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] > *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] > *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_NOTEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] != *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] != *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_EQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] == *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  if (z[i] == *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_ALWAYS:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLushort *zptr = Z_ADDRESS16(ctx,x[i],y[i]);
-		  *zptr = z[i];
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer or mask */
-	 }
-	 break;
-      case GL_NEVER:
-	 /* depth test never passes */
-         BZERO(mask, n * sizeof(GLubyte));
-	 break;
-      default:
-         gl_problem(ctx, "Bad depth func in software_depth_test_pixels");
-   }
-}
-
-
-
-/*
- * Do depth testing for an array of fragments using software Z buffer.
- */
-static void
-software_depth_test_pixels32( GLcontext *ctx, GLuint n,
-                              const GLint x[], const GLint y[],
-                              const GLdepth z[], GLubyte mask[] )
-{
-   /* switch cases ordered from most frequent to less frequent */
-   switch (ctx->Depth.Func) {
-      case GL_LESS:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] < *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] < *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_LEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] <= *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] <= *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] >= *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] >= *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GREATER:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] > *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] > *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_NOTEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] != *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] != *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_EQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] == *zptr) {
-		     /* pass */
-		     *zptr = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  if (z[i] == *zptr) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_ALWAYS:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  GLuint *zptr = Z_ADDRESS32(ctx,x[i],y[i]);
-		  *zptr = z[i];
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer or mask */
-	 }
-	 break;
-      case GL_NEVER:
-	 /* depth test never passes */
-         BZERO(mask, n * sizeof(GLubyte));
-	 break;
-      default:
-         gl_problem(ctx, "Bad depth func in software_depth_test_pixels");
-   }
-}
-
-
-
-/*
- * Do depth testing for an array of pixels using hardware Z buffer.
- * Input/output:  zbuffer - array of depth values from Z buffer
- * Input:  z - array of fragment z values.
- */
-static void
-hardware_depth_test_pixels( GLcontext *ctx, GLuint n, GLdepth zbuffer[],
-                            const GLdepth z[], GLubyte mask[] )
-{
-   /* switch cases ordered from most frequent to less frequent */
-   switch (ctx->Depth.Func) {
-      case GL_LESS:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] < zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] < zbuffer[i]) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_LEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] <= zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] <= zbuffer[i]) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] >= zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] >= zbuffer[i]) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_GREATER:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] > zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] > zbuffer[i]) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_NOTEQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] != zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] != zbuffer[i]) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_EQUAL:
-         if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] == zbuffer[i]) {
-		     /* pass */
-		     zbuffer[i] = z[i];
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  if (z[i] == zbuffer[i]) {
-		     /* pass */
-		  }
-		  else {
-		     /* fail */
-		     mask[i] = 0;
-		  }
-	       }
-	    }
-	 }
-	 break;
-      case GL_ALWAYS:
-	 if (ctx->Depth.Mask) {
-	    /* Update Z buffer */
-            GLuint i;
-	    for (i=0; i<n; i++) {
-	       if (mask[i]) {
-		  zbuffer[i] = z[i];
-	       }
-	    }
-	 }
-	 else {
-	    /* Don't update Z buffer or mask */
-	 }
-	 break;
-      case GL_NEVER:
-	 /* depth test never passes */
-         BZERO(mask, n * sizeof(GLubyte));
-	 break;
-      default:
-         gl_problem(ctx, "Bad depth func in hardware_depth_test_pixels");
-   }
-}
-
-
-
-void
-_mesa_depth_test_pixels( GLcontext *ctx,
-                         GLuint n, const GLint x[], const GLint y[],
-                         const GLdepth z[], GLubyte mask[] )
-{
-   if (ctx->Driver.ReadDepthPixels) {
-      /* read depth values from hardware Z buffer */
-      GLdepth zbuffer[PB_SIZE];
-      (*ctx->Driver.ReadDepthPixels)(ctx, n, x, y, zbuffer);
-
-      hardware_depth_test_pixels( ctx, n, zbuffer, z, mask );
-
-      /* update hardware Z buffer with new values */
-      assert(ctx->Driver.WriteDepthPixels);
-      (*ctx->Driver.WriteDepthPixels)(ctx, n, x, y, zbuffer, mask );
-   }
-   else {
-      /* software depth testing */
-      if (ctx->Visual.DepthBits <= 16)
-         software_depth_test_pixels16(ctx, n, x, y, z, mask);
-      else
-         software_depth_test_pixels32(ctx, n, x, y, z, mask);
-   }
-}
-
-
-
-
-
-/**********************************************************************/
-/*****                      Read Depth Buffer                     *****/
-/**********************************************************************/
-
-
-/*
- * Read a span of depth values from the depth buffer.
- * This function does clipping before calling the device driver function.
- */
-void
-_mesa_read_depth_span( GLcontext *ctx,
-                       GLint n, GLint x, GLint y, GLdepth depth[] )
-{
-   if (y < 0 || y >= ctx->DrawBuffer->Height ||
-       x + (GLint) n <= 0 || x >= ctx->DrawBuffer->Width) {
-      /* span is completely outside framebuffer */
-      GLint i;
-      for (i = 0; i < n; i++)
-         depth[i] = 0;
-      return;
-   }
-
-   if (x < 0) {
-      GLint dx = -x;
-      GLint i;
-      for (i = 0; i < dx; i++)
-         depth[i] = 0;
-      x = 0;
-      n -= dx;
-      depth += dx;
-   }
-   if (x + n > ctx->DrawBuffer->Width) {
-      GLint dx = x + n - ctx->DrawBuffer->Width;
-      GLint i;
-      for (i = 0; i < dx; i++)
-         depth[n - i - 1] = 0;
-      n -= dx;
-   }
-   if (n <= 0) {
-      return;
-   }
-
-   if (ctx->DrawBuffer->DepthBuffer) {
-      /* read from software depth buffer */
-      if (ctx->Visual.DepthBits <= 16) {
-         const GLushort *zptr = Z_ADDRESS16( ctx, x, y );
-         GLuint i;
-         for (i = 0; i < n; i++) {
-            depth[i] = zptr[i];
-         }
-      }
-      else {
-         const GLuint *zptr = Z_ADDRESS32( ctx, x, y );
-         GLuint i;
-         for (i = 0; i < n; i++) {
-            depth[i] = zptr[i];
-         }
-      }
-   }
-   else if (ctx->Driver.ReadDepthSpan) {
-      /* read from hardware depth buffer */
-      (*ctx->Driver.ReadDepthSpan)( ctx, n, x, y, depth );
-   }
-   else {
-      /* no depth buffer */
-      BZERO(depth, n * sizeof(GLfloat));
-   }
-
-}
-
-
-
-
-/*
- * Return a span of depth values from the depth buffer as floats in [0,1].
- * This is used for both hardware and software depth buffers.
- * Input:  n - how many pixels
- *         x,y - location of first pixel
- * Output:  depth - the array of depth values
- */
-void
-_mesa_read_depth_span_float( GLcontext *ctx,
-                             GLint n, GLint x, GLint y, GLfloat depth[] )
-{
-   const GLfloat scale = 1.0F / ctx->Visual.DepthMaxF;
-
-   if (y < 0 || y >= ctx->DrawBuffer->Height ||
-       x + (GLint) n <= 0 || x >= ctx->DrawBuffer->Width) {
-      /* span is completely outside framebuffer */
-      GLint i;
-      for (i = 0; i < n; i++)
-         depth[i] = 0.0F;
-      return;
-   }
-
-   if (x < 0) {
-      GLint dx = -x;
-      GLint i;
-      for (i = 0; i < dx; i++)
-         depth[i] = 0.0F;
-      n -= dx;
-      x = 0;
-   }
-   if (x + n > ctx->DrawBuffer->Width) {
-      GLint dx = x + n - ctx->DrawBuffer->Width;
-      GLint i;
-      for (i = 0; i < dx; i++)
-         depth[n - i - 1] = 0.0F;
-      n -= dx;
-   }
-   if (n <= 0) {
-      return;
-   }
-
-   if (ctx->DrawBuffer->DepthBuffer) {
-      /* read from software depth buffer */
-      if (ctx->Visual.DepthBits <= 16) {
-         const GLushort *zptr = Z_ADDRESS16( ctx, x, y );
-         GLuint i;
-         for (i = 0; i < n; i++) {
-            depth[i] = (GLfloat) zptr[i] * scale;
-         }
-      }
-      else {
-         const GLuint *zptr = Z_ADDRESS32( ctx, x, y );
-         GLuint i;
-         for (i = 0; i < n; i++) {
-            depth[i] = (GLfloat) zptr[i] * scale;
-         }
-      }
-   }
-   else if (ctx->Driver.ReadDepthSpan) {
-      /* read from hardware depth buffer */
-      GLdepth d[MAX_WIDTH];
-      GLuint i;
-      assert(n <= MAX_WIDTH);
-      (*ctx->Driver.ReadDepthSpan)( ctx, n, x, y, d );
-      for (i = 0; i < n; i++) {
-	 depth[i] = d[i] * scale;
-      }
-   }
-   else {
-      /* no depth buffer */
-      BZERO(depth, n * sizeof(GLfloat));
-   }
-}
-
-
-
-/**********************************************************************/
-/*****                Allocate and Clear Depth Buffer             *****/
-/**********************************************************************/
-
-
-
-/*
- * Allocate a new depth buffer.  If there's already a depth buffer allocated
- * it will be free()'d.  The new depth buffer will be uniniitalized.
- * This function is only called through Driver.alloc_depth_buffer.
- */
-void
-_mesa_alloc_depth_buffer( GLcontext *ctx )
-{
-   /* deallocate current depth buffer if present */
-   if (ctx->DrawBuffer->UseSoftwareDepthBuffer) {
-      GLint bytesPerValue;
-
-      if (ctx->DrawBuffer->DepthBuffer) {
-         FREE(ctx->DrawBuffer->DepthBuffer);
-         ctx->DrawBuffer->DepthBuffer = NULL;
-      }
-
-      /* allocate new depth buffer, but don't initialize it */
-      if (ctx->Visual.DepthBits <= 16)
-         bytesPerValue = sizeof(GLushort);
-      else
-         bytesPerValue = sizeof(GLuint);
-
-      ctx->DrawBuffer->DepthBuffer = MALLOC( ctx->DrawBuffer->Width
-                                             * ctx->DrawBuffer->Height
-                                             * bytesPerValue );
-
-      if (!ctx->DrawBuffer->DepthBuffer) {
-         /* out of memory */
-         ctx->Depth.Test = GL_FALSE;
-         ctx->NewState |= _NEW_DEPTH;
-         gl_error( ctx, GL_OUT_OF_MEMORY, "Couldn't allocate depth buffer" );
-      }
-   }
-}
-
-
-
-
-/*
- * Clear the depth buffer.  If the depth buffer doesn't exist yet we'll
- * allocate it now.
- * This function is only called through Driver.clear_depth_buffer.
- */
-void
-_mesa_clear_depth_buffer( GLcontext *ctx )
-{
-   if (ctx->Visual.DepthBits == 0
-       || !ctx->DrawBuffer->DepthBuffer
-       || !ctx->Depth.Mask) {
-      /* no depth buffer, or writing to it is disabled */
-      return;
-   }
-
-   /* The loops in this function have been written so the IRIX 5.3
-    * C compiler can unroll them.  Hopefully other compilers can too!
-    */
-
-   if (ctx->Scissor.Enabled) {
-      /* only clear scissor region */
-      if (ctx->Visual.DepthBits <= 16) {
-         const GLushort clearValue = (GLushort) (ctx->Depth.Clear * ctx->Visual.DepthMax);
-         const GLint rows = ctx->DrawBuffer->Ymax - ctx->DrawBuffer->Ymin;
-         const GLint width = ctx->DrawBuffer->Width;
-         GLushort *dRow = (GLushort *) ctx->DrawBuffer->DepthBuffer
-            + ctx->DrawBuffer->Ymin * width + ctx->DrawBuffer->Xmin;
-         GLint i, j;
-         for (i = 0; i < rows; i++) {
-            for (j = 0; j < width; j++) {
-               dRow[j] = clearValue;
-            }
-            dRow += width;
-         }
-      }
-      else {
-         const GLuint clearValue = (GLuint) (ctx->Depth.Clear * ctx->Visual.DepthMax);
-         const GLint rows = ctx->DrawBuffer->Ymax - ctx->DrawBuffer->Ymin;
-         const GLint width = ctx->DrawBuffer->Width;
-         GLuint *dRow = (GLuint *) ctx->DrawBuffer->DepthBuffer
-            + ctx->DrawBuffer->Ymin * width + ctx->DrawBuffer->Xmin;
-         GLint i, j;
-         for (i = 0; i < rows; i++) {
-            for (j = 0; j < width; j++) {
-               dRow[j] = clearValue;
-            }
-            dRow += width;
-         }
-      }
-   }
-   else {
-      /* clear whole buffer */
-      if (ctx->Visual.DepthBits <= 16) {
-         const GLushort clearValue = (GLushort) (ctx->Depth.Clear * ctx->Visual.DepthMax);
-         if ((clearValue & 0xff) == (clearValue >> 8)) {
-            if (clearValue == 0) {
-               BZERO(ctx->DrawBuffer->DepthBuffer,
-                     2*ctx->DrawBuffer->Width*ctx->DrawBuffer->Height);
-            }
-            else {
-               /* lower and upper bytes of clear_value are same, use MEMSET */
-               MEMSET( ctx->DrawBuffer->DepthBuffer, clearValue & 0xff,
-                       2 * ctx->DrawBuffer->Width * ctx->DrawBuffer->Height);
-            }
-         }
-         else {
-            GLushort *d = (GLushort *) ctx->DrawBuffer->DepthBuffer;
-            GLint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
-            while (n >= 16) {
-               d[0] = clearValue;    d[1] = clearValue;
-               d[2] = clearValue;    d[3] = clearValue;
-               d[4] = clearValue;    d[5] = clearValue;
-               d[6] = clearValue;    d[7] = clearValue;
-               d[8] = clearValue;    d[9] = clearValue;
-               d[10] = clearValue;   d[11] = clearValue;
-               d[12] = clearValue;   d[13] = clearValue;
-               d[14] = clearValue;   d[15] = clearValue;
-               d += 16;
-               n -= 16;
-            }
-            while (n > 0) {
-               *d++ = clearValue;
-               n--;
-            }
-         }
-      }
-      else {
-         /* >16 bit depth buffer */
-         const GLuint clearValue = (GLuint) (ctx->Depth.Clear * ctx->Visual.DepthMax);
-         if (clearValue == 0) {
-            BZERO(ctx->DrawBuffer->DepthBuffer,
-                ctx->DrawBuffer->Width*ctx->DrawBuffer->Height*sizeof(GLuint));
-         }
-         else {
-            GLint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
-            GLuint *d = (GLuint *) ctx->DrawBuffer->DepthBuffer;
-            while (n >= 16) {
-               d[0] = clearValue;    d[1] = clearValue;
-               d[2] = clearValue;    d[3] = clearValue;
-               d[4] = clearValue;    d[5] = clearValue;
-               d[6] = clearValue;    d[7] = clearValue;
-               d[8] = clearValue;    d[9] = clearValue;
-               d[10] = clearValue;   d[11] = clearValue;
-               d[12] = clearValue;   d[13] = clearValue;
-               d[14] = clearValue;   d[15] = clearValue;
-               d += 16;
-               n -= 16;
-            }
-            while (n > 0) {
-               *d++ = clearValue;
-               n--;
-            }
-         }
-      }
-   }
-}