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/* $Id: logic.c,v 1.1 1996/09/13 01:38:16 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.0
* Copyright (C) 1995-1996 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: logic.c,v $
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
#include "context.h"
#include "dlist.h"
#include "logic.h"
#include "macros.h"
#include "pb.h"
#include "types.h"
void gl_LogicOp( GLcontext *ctx, GLenum opcode )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glLogicOp" );
return;
}
switch (opcode) {
case GL_CLEAR:
case GL_SET:
case GL_COPY:
case GL_COPY_INVERTED:
case GL_NOOP:
case GL_INVERT:
case GL_AND:
case GL_NAND:
case GL_OR:
case GL_NOR:
case GL_XOR:
case GL_EQUIV:
case GL_AND_REVERSE:
case GL_AND_INVERTED:
case GL_OR_REVERSE:
case GL_OR_INVERTED:
ctx->Color.LogicOp = opcode;
ctx->NewState |= NEW_RASTER_OPS;
return;
default:
gl_error( ctx, GL_INVALID_ENUM, "glLogicOp" );
return;
}
}
/*
* Apply the current logic operator to a span of pixels. This is only
* used if the device driver can't do logic ops.
*/
void gl_logic_span( GLcontext *ctx, GLuint n, GLint x, GLint y, GLuint index[],
GLubyte mask[] )
{
GLuint dest[MAX_WIDTH];
GLuint i;
/* Read dest values from frame buffer */
(*ctx->Driver.ReadIndexSpan)( ctx, n, x, y, dest );
switch (ctx->Color.LogicOp) {
case GL_CLEAR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = 0;
}
}
break;
case GL_SET:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = 1;
}
}
break;
case GL_COPY:
/* do nothing */
break;
case GL_COPY_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !index[i];
}
}
break;
case GL_NOOP:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = dest[i];
}
}
break;
case GL_INVERT:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !dest[i];
}
}
break;
case GL_AND:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] &= dest[i];
}
}
break;
case GL_NAND:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !(index[i] & dest[i]);
}
}
break;
case GL_OR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] |= dest[i];
}
}
break;
case GL_NOR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !(index[i] | dest[i]);
}
}
break;
case GL_XOR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] ^= dest[i];
}
}
break;
case GL_EQUIV:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !(index[i] ^ dest[i]);
}
}
break;
case GL_AND_REVERSE:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = index[i] & !dest[i];
}
}
break;
case GL_AND_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !index[i] & dest[i];
}
}
break;
case GL_OR_REVERSE:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = index[i] | !dest[i];
}
}
break;
case GL_OR_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !index[i] | dest[i];
}
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "gl_logic error" );
}
}
/*
* Apply the current logic operator to an array of pixels. This is only
* used if the device driver can't do logic ops.
*/
void gl_logic_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLuint index[], GLubyte mask[] )
{
GLuint dest[PB_SIZE];
GLuint i;
/* Read dest values from frame buffer */
(*ctx->Driver.ReadIndexPixels)( ctx, n, x, y, dest, mask );
switch (ctx->Color.LogicOp) {
case GL_CLEAR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = 0;
}
}
break;
case GL_SET:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = 1;
}
}
break;
case GL_COPY:
/* do nothing */
break;
case GL_COPY_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !index[i];
}
}
break;
case GL_NOOP:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = dest[i];
}
}
break;
case GL_INVERT:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !dest[i];
}
}
break;
case GL_AND:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] &= dest[i];
}
}
break;
case GL_NAND:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !(index[i] & dest[i]);
}
}
break;
case GL_OR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] |= dest[i];
}
}
break;
case GL_NOR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !(index[i] | dest[i]);
}
}
break;
case GL_XOR:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] ^= dest[i];
}
}
break;
case GL_EQUIV:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !(index[i] ^ dest[i]);
}
}
break;
case GL_AND_REVERSE:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = index[i] & !dest[i];
}
}
break;
case GL_AND_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !index[i] & dest[i];
}
}
break;
case GL_OR_REVERSE:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = index[i] | !dest[i];
}
}
break;
case GL_OR_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
index[i] = !index[i] | dest[i];
}
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "gl_logic_pixels error" );
}
}
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