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- /* $Id: masking.c,v 3.1 1998/02/08 20:19:41 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.0
- * Copyright (C) 1995-1998 Brian Paul
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
- /*
- * $Log: masking.c,v $
- * Revision 3.1 1998/02/08 20:19:41 brianp
- * ColorMask is now GLubyte[4] instead of GLuint
- *
- * Revision 3.0 1998/01/31 20:58:46 brianp
- * initial rev
- *
- */
-
-
- /*
- * Implement the effect of glColorMask and glIndexMask in software.
- */
-
-
- #ifdef PC_HEADER
- #include "all.h"
- #else
- #include <string.h>
- #include "alphabuf.h"
- #include "context.h"
- #include "macros.h"
- #include "masking.h"
- #include "pb.h"
- #include "span.h"
- #include "types.h"
- #endif
-
-
-
- void gl_IndexMask( GLcontext *ctx, GLuint mask )
- {
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glIndexMask" );
- return;
- }
- ctx->Color.IndexMask = mask;
- ctx->NewState |= NEW_RASTER_OPS;
- }
-
-
-
- void gl_ColorMask( GLcontext *ctx, GLboolean red, GLboolean green,
- GLboolean blue, GLboolean alpha )
- {
- if (INSIDE_BEGIN_END(ctx)) {
- gl_error( ctx, GL_INVALID_OPERATION, "glColorMask" );
- return;
- }
- ctx->Color.ColorMask[RCOMP] = red ? 0xff : 0x0;
- ctx->Color.ColorMask[GCOMP] = green ? 0xff : 0x0;
- ctx->Color.ColorMask[BCOMP] = blue ? 0xff : 0x0;
- ctx->Color.ColorMask[ACOMP] = alpha ? 0xff : 0x0;
-
- ctx->NewState |= NEW_RASTER_OPS;
- }
-
-
-
-
- /*
- * Apply glColorMask to a span of RGBA pixels.
- */
- void gl_mask_rgba_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y, GLubyte rgba[][4] )
- {
- GLubyte dest[MAX_WIDTH][4];
- GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
- GLuint dstMask = ~srcMask;
- GLuint *rgba32 = (GLuint *) rgba;
- GLuint *dest32 = (GLuint *) dest;
- GLuint i;
-
- gl_read_rgba_span( ctx, n, x, y, dest );
-
- for (i=0; i<n; i++) {
- rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
- }
- }
-
-
-
- /*
- * Apply glColorMask to an array of RGBA pixels.
- */
- void gl_mask_rgba_pixels( GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- GLubyte rgba[][4], const GLubyte mask[] )
- {
- GLubyte dest[PB_SIZE][4];
- GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
- GLuint dstMask = ~srcMask;
- GLuint *rgba32 = (GLuint *) rgba;
- GLuint *dest32 = (GLuint *) dest;
- GLuint i;
-
- (*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask );
-
- for (i=0; i<n; i++) {
- rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
- }
- }
-
-
-
- /*
- * Apply glIndexMask to a span of CI pixels.
- */
- void gl_mask_index_span( GLcontext *ctx,
- GLuint n, GLint x, GLint y, GLuint index[] )
- {
- GLuint i;
- GLuint fbindexes[MAX_WIDTH];
- GLuint msrc, mdest;
-
- gl_read_index_span( ctx, n, x, y, fbindexes );
-
- msrc = ctx->Color.IndexMask;
- mdest = ~msrc;
-
- for (i=0;i<n;i++) {
- index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
- }
- }
-
-
-
- /*
- * Apply glIndexMask to an array of CI pixels.
- */
- void gl_mask_index_pixels( GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- GLuint index[], const GLubyte mask[] )
- {
- GLuint i;
- GLuint fbindexes[PB_SIZE];
- GLuint msrc, mdest;
-
- (*ctx->Driver.ReadCI32Pixels)( ctx, n, x, y, fbindexes, mask );
-
- msrc = ctx->Color.IndexMask;
- mdest = ~msrc;
-
- for (i=0;i<n;i++) {
- index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
- }
- }
-
-