first checkpoint commit of Klaus's new span code (struct sw_span)

1 files changed, 58 insertions, 3 deletions

diff --git a/src/mesa/swrast/s_stencil.c b/src/mesa/swrast/s_stencil.c
index 1a80cc1b43..488ccc0559 100644
--- a/src/mesa/swrast/s_stencil.c
+++ b/src/mesa/swrast/s_stencil.c
@@ -1,4 +1,4 @@
-/* $Id: s_stencil.c,v 1.12 2001/05/17 20:18:45 brianp Exp $ */
+/* $Id: s_stencil.c,v 1.13 2001/12/17 04:54:35 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -457,7 +457,7 @@ stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
       MEMCPY(oldmask, mask, n * sizeof(GLubyte));
 
       /* apply the depth test */
-      _mesa_depth_test_span(ctx, n, x, y, z, mask);
+      _old_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
@@ -502,7 +502,7 @@ stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
  *
  */
 GLboolean
-_mesa_stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
+_old_stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
                               const GLdepth z[], GLubyte mask[] )
 {
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
@@ -536,6 +536,61 @@ _mesa_stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
    return result;
 }
 
+/*
+ * 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, struct sw_span *span)
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+
+   GLstencil stencilRow[MAX_WIDTH];
+   GLstencil *stencil;
+   GLboolean result;
+   
+   ASSERT(ctx->Stencil.Enabled);
+   ASSERT(span->end <= MAX_WIDTH);
+   ASSERT(span->filledMask == GL_TRUE);
+   ASSERT(span->filledDepth == GL_TRUE);
+   SW_SPAN_SET_FLAG(span->testedDepth);
+   
+   
+   /* Get initial stencil values */
+   if (swrast->Driver.WriteStencilSpan) {
+      ASSERT(swrast->Driver.ReadStencilSpan);
+      /* Get stencil values from the hardware stencil buffer */
+      (*swrast->Driver.ReadStencilSpan)(ctx, span->end, span->x, span->y, stencilRow);
+      stencil = stencilRow;
+   }
+   else {
+      /* software stencil buffer */
+      stencil = STENCIL_ADDRESS(span->x, span->y);
+   }
+   
+   /* do all the stencil/depth testing/updating */
+   result = stencil_and_ztest_span( ctx, span->end, span->x, span->y,
+				    span->depth, stencil, span->mask );
+   
+   if (swrast->Driver.WriteStencilSpan) {
+      /* Write updated stencil values into hardware stencil buffer */
+      (swrast->Driver.WriteStencilSpan)(ctx, span->end, span->x,
+					span->y, stencil, span->mask );
+   }
+   
+   span->write_all = GL_FALSE;
+   
+   return result;
+}
+