Initial import.

1 files changed, 191 insertions, 0 deletions

diff --git a/src/mesa/swrast/s_masking.c b/src/mesa/swrast/s_masking.c
new file mode 100644
index 0000000..3badb86
--- /dev/null
+++ b/src/mesa/swrast/s_masking.c
@@ -0,0 +1,191 @@
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  4.1
+ *
+ * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * Implement the effect of glColorMask and glIndexMask in software.
+ */
+
+
+#include "glheader.h"
+#include "enums.h"
+#include "macros.h"
+
+#include "s_alphabuf.h"
+#include "s_context.h"
+#include "s_masking.h"
+#include "s_span.h"
+
+
+
+void
+_swrast_mask_rgba_span( GLcontext *ctx, const struct sw_span *span,
+                     GLchan rgba[][4] )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GLchan dest[MAX_WIDTH][4];
+#if CHAN_BITS == 8
+   GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
+   GLuint dstMask = ~srcMask;
+   GLuint *rgba32 = (GLuint *) rgba;
+   GLuint *dest32 = (GLuint *) dest;
+#else
+   const GLboolean rMask = ctx->Color.ColorMask[RCOMP];
+   const GLboolean gMask = ctx->Color.ColorMask[GCOMP];
+   const GLboolean bMask = ctx->Color.ColorMask[BCOMP];
+   const GLboolean aMask = ctx->Color.ColorMask[ACOMP];
+#endif
+   const GLuint n = span->end;
+   GLuint i;
+
+   ASSERT(n < MAX_WIDTH);
+   ASSERT(span->arrayMask & SPAN_RGBA);
+
+   if (span->arrayMask & SPAN_XY) {
+      (*swrast->Driver.ReadRGBAPixels)(ctx, n, span->array->x, span->array->y,
+                                       dest, span->array->mask);
+      if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
+         _swrast_read_alpha_pixels(ctx, n, span->array->x, span->array->y,
+                                 dest, span->array->mask);
+      }
+   }
+   else {
+      _swrast_read_rgba_span(ctx, ctx->DrawBuffer, n, span->x, span->y, dest);
+   }
+
+#if CHAN_BITS == 8
+   for (i = 0; i < n; i++) {
+      rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
+   }
+#else
+   for (i = 0; i < n; i++) {
+      if (!rMask)  rgba[i][RCOMP] = dest[i][RCOMP];
+      if (!gMask)  rgba[i][GCOMP] = dest[i][GCOMP];
+      if (!bMask)  rgba[i][BCOMP] = dest[i][BCOMP];
+      if (!aMask)  rgba[i][ACOMP] = dest[i][ACOMP];
+   }
+#endif
+}
+
+
+
+
+/*
+ * Apply glColorMask to a span of RGBA pixels.
+ */
+void
+_swrast_mask_rgba_array( GLcontext *ctx,
+                       GLuint n, GLint x, GLint y, GLchan rgba[][4] )
+{
+   GLchan dest[MAX_WIDTH][4];
+   GLuint i;
+
+#if CHAN_BITS == 8
+
+   GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
+   GLuint dstMask = ~srcMask;
+   GLuint *rgba32 = (GLuint *) rgba;
+   GLuint *dest32 = (GLuint *) dest;
+
+   _swrast_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
+   for (i = 0; i < n; i++) {
+      rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
+   }
+
+#else
+
+   const GLint rMask = ctx->Color.ColorMask[RCOMP];
+   const GLint gMask = ctx->Color.ColorMask[GCOMP];
+   const GLint bMask = ctx->Color.ColorMask[BCOMP];
+   const GLint aMask = ctx->Color.ColorMask[ACOMP];
+
+   _swrast_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
+   for (i = 0; i < n; i++) {
+      if (!rMask)  rgba[i][RCOMP] = dest[i][RCOMP];
+      if (!gMask)  rgba[i][GCOMP] = dest[i][GCOMP];
+      if (!bMask)  rgba[i][BCOMP] = dest[i][BCOMP];
+      if (!aMask)  rgba[i][ACOMP] = dest[i][ACOMP];
+   }
+
+#endif
+}
+
+
+
+void
+_swrast_mask_index_span( GLcontext *ctx, const struct sw_span *span,
+                       GLuint index[] )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   const GLuint msrc = ctx->Color.IndexMask;
+   const GLuint mdest = ~msrc;
+   GLuint fbindexes[MAX_WIDTH];
+   GLuint i;
+
+   ASSERT(span->arrayMask & SPAN_INDEX);
+   ASSERT(span->end < MAX_WIDTH);
+
+   if (span->arrayMask & SPAN_XY) {
+
+      (*swrast->Driver.ReadCI32Pixels)(ctx, span->end, span->array->x,
+                                       span->array->y, fbindexes,
+                                       span->array->mask);
+
+      for (i = 0; i < span->end; i++) {
+         index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
+      }
+   }
+   else {
+      _swrast_read_index_span(ctx, ctx->DrawBuffer, span->end, span->x, span->y,
+                            fbindexes );
+
+      for (i = 0; i < span->end; i++) {
+         index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
+      }
+   }
+}
+
+
+
+/*
+ * Apply glIndexMask to a span of CI pixels.
+ */
+void
+_swrast_mask_index_array( GLcontext *ctx,
+                        GLuint n, GLint x, GLint y, GLuint index[] )
+{
+   GLuint i;
+   GLuint fbindexes[MAX_WIDTH];
+   GLuint msrc, mdest;
+
+   _swrast_read_index_span( ctx, ctx->DrawBuffer, n, x, y, fbindexes );
+
+   msrc = ctx->Color.IndexMask;
+   mdest = ~msrc;
+
+   for (i=0;i<n;i++) {
+      index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
+   }
+}