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/* $Id: s_masking.c,v 1.1 2003-02-28 11:49:42 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  4.1
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 *
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 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 */
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/*
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 * Implement the effect of glColorMask and glIndexMask in software.
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 */
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#include "glheader.h"
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#include "enums.h"
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#include "macros.h"
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#include "s_alphabuf.h"
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#include "s_context.h"
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#include "s_masking.h"
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#include "s_span.h"
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void
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_mesa_mask_rgba_span( GLcontext *ctx, const struct sw_span *span,
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                     GLchan rgba[][4] )
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{
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   SWcontext *swrast = SWRAST_CONTEXT(ctx);
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   GLchan dest[MAX_WIDTH][4];
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#if CHAN_BITS == 8
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   GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
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   GLuint dstMask = ~srcMask;
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   GLuint *rgba32 = (GLuint *) rgba;
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   GLuint *dest32 = (GLuint *) dest;
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#else
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   const GLboolean rMask = ctx->Color.ColorMask[RCOMP];
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   const GLboolean gMask = ctx->Color.ColorMask[GCOMP];
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   const GLboolean bMask = ctx->Color.ColorMask[BCOMP];
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   const GLboolean aMask = ctx->Color.ColorMask[ACOMP];
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#endif
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   const GLuint n = span->end;
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   GLuint i;
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   ASSERT(n < MAX_WIDTH);
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   ASSERT(span->arrayMask & SPAN_RGBA);
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   if (span->arrayMask & SPAN_XY) {
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      (*swrast->Driver.ReadRGBAPixels)(ctx, n, span->array->x, span->array->y,
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                                       dest, span->array->mask);
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      if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
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         _mesa_read_alpha_pixels(ctx, n, span->array->x, span->array->y,
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                                 dest, span->array->mask);
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      }
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   }
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   else {
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      _mesa_read_rgba_span(ctx, ctx->DrawBuffer, n, span->x, span->y, dest);
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   }
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#if CHAN_BITS == 8
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   for (i = 0; i < n; i++) {
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      rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
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   }
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#else
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   for (i = 0; i < n; i++) {
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      if (!rMask)  rgba[i][RCOMP] = dest[i][RCOMP];
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      if (!gMask)  rgba[i][GCOMP] = dest[i][GCOMP];
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      if (!bMask)  rgba[i][BCOMP] = dest[i][BCOMP];
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      if (!aMask)  rgba[i][ACOMP] = dest[i][ACOMP];
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   }
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#endif
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}
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/*
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 * Apply glColorMask to a span of RGBA pixels.
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 */
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void
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_mesa_mask_rgba_array( GLcontext *ctx,
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                       GLuint n, GLint x, GLint y, GLchan rgba[][4] )
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{
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   GLchan dest[MAX_WIDTH][4];
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   GLuint i;
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#if CHAN_BITS == 8
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   GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
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   GLuint dstMask = ~srcMask;
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   GLuint *rgba32 = (GLuint *) rgba;
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   GLuint *dest32 = (GLuint *) dest;
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   _mesa_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
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   for (i = 0; i < n; i++) {
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      rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
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   }
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#else
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   const GLint rMask = ctx->Color.ColorMask[RCOMP];
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   const GLint gMask = ctx->Color.ColorMask[GCOMP];
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   const GLint bMask = ctx->Color.ColorMask[BCOMP];
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   const GLint aMask = ctx->Color.ColorMask[ACOMP];
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   _mesa_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
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   for (i = 0; i < n; i++) {
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      if (!rMask)  rgba[i][RCOMP] = dest[i][RCOMP];
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      if (!gMask)  rgba[i][GCOMP] = dest[i][GCOMP];
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      if (!bMask)  rgba[i][BCOMP] = dest[i][BCOMP];
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      if (!aMask)  rgba[i][ACOMP] = dest[i][ACOMP];
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   }
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#endif
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}
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void
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_mesa_mask_index_span( GLcontext *ctx, const struct sw_span *span,
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                       GLuint index[] )
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{
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   SWcontext *swrast = SWRAST_CONTEXT(ctx);
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   const GLuint msrc = ctx->Color.IndexMask;
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   const GLuint mdest = ~msrc;
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   GLuint fbindexes[MAX_WIDTH];
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   GLuint i;
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   ASSERT(span->arrayMask & SPAN_INDEX);
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   ASSERT(span->end < MAX_WIDTH);
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   if (span->arrayMask & SPAN_XY) {
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      (*swrast->Driver.ReadCI32Pixels)(ctx, span->end, span->array->x,
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                                       span->array->y, fbindexes,
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                                       span->array->mask);
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      for (i = 0; i < span->end; i++) {
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         index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
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      }
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   }
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   else {
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      _mesa_read_index_span(ctx, ctx->DrawBuffer, span->end, span->x, span->y,
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                            fbindexes );
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      for (i = 0; i < span->end; i++) {
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         index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
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      }
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   }
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}
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/*
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 * Apply glIndexMask to a span of CI pixels.
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 */
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void
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_mesa_mask_index_array( GLcontext *ctx,
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                        GLuint n, GLint x, GLint y, GLuint index[] )
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{
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   GLuint i;
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   GLuint fbindexes[MAX_WIDTH];
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   GLuint msrc, mdest;
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   _mesa_read_index_span( ctx, ctx->DrawBuffer, n, x, y, fbindexes );
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   msrc = ctx->Color.IndexMask;
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   mdest = ~msrc;
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   for (i=0;i<n;i++) {
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      index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
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   }
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}