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/* $Id: s_masking.c,v 1.1 2003-02-28 11:49:42 pj Exp $ */

/*

 * 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

_mesa_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) {

         _mesa_read_alpha_pixels(ctx, n, span->array->x, span->array->y,

                                 dest, span->array->mask);

      }

   }

   else {

      _mesa_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

_mesa_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;

   _mesa_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];

   _mesa_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

_mesa_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 {

      _mesa_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

_mesa_mask_index_array( GLcontext *ctx,

                        GLuint n, GLint x, GLint y, GLuint index[] )

{

   GLuint i;

   GLuint fbindexes[MAX_WIDTH];

   GLuint msrc, mdest;

   _mesa_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);

   }

}