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/* $Id: s_logic.c,v 1.5 2001/03/12 00:48:42 gareth Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 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.
*/
#include "glheader.h"
#include "context.h"
#include "macros.h"
#include "s_alphabuf.h"
#include "s_context.h"
#include "s_logic.h"
#include "s_pb.h"
#include "s_span.h"
/*
* Apply logic op to array of CI pixels.
*/
static void index_logicop( GLcontext *ctx, GLuint n,
GLuint index[], const GLuint dest[],
const GLubyte mask[] )
{
GLuint i;
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] = ~0;
}
}
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:
_mesa_problem(ctx, "bad mode in index_logic()");
}
}
/*
* Apply the current logic operator to a span of CI pixels. This is only
* used if the device driver can't do logic ops.
*/
void
_mesa_logicop_ci_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
GLuint index[], const GLubyte mask[] )
{
GLuint dest[MAX_WIDTH];
/* Read dest values from frame buffer */
(*ctx->Driver.ReadCI32Span)( ctx, n, x, y, dest );
index_logicop( ctx, n, index, dest, mask );
}
/*
* Apply the current logic operator to an array of CI pixels. This is only
* used if the device driver can't do logic ops.
*/
void
_mesa_logicop_ci_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLuint index[], const GLubyte mask[] )
{
GLuint dest[PB_SIZE];
/* Read dest values from frame buffer */
(*ctx->Driver.ReadCI32Pixels)( ctx, n, x, y, dest, mask );
index_logicop( ctx, n, index, dest, mask );
}
/*
* Apply logic operator to rgba pixels.
* Input: ctx - the context
* n - number of pixels
* mask - pixel mask array
* In/Out: src - incoming pixels which will be modified
* Input: dest - frame buffer values
*
* Note: Since the R, G, B, and A channels are all treated the same we
* process them as 4-byte GLuints instead of four GLubytes.
*/
static void rgba_logicop( const GLcontext *ctx, GLuint n,
const GLubyte mask[],
GLuint src[], const GLuint dest[] )
{
GLuint i;
switch (ctx->Color.LogicOp) {
case GL_CLEAR:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = 0;
}
}
break;
case GL_SET:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~0;
}
}
break;
case GL_COPY:
/* do nothing */
break;
case GL_COPY_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~src[i];
}
}
break;
case GL_NOOP:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = dest[i];
}
}
break;
case GL_INVERT:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~dest[i];
}
}
break;
case GL_AND:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] &= dest[i];
}
}
break;
case GL_NAND:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~(src[i] & src[i]);
}
}
break;
case GL_OR:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i]|= dest[i];
}
}
break;
case GL_NOR:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~(src[i] | dest[i]);
}
}
break;
case GL_XOR:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] ^= dest[i];
}
}
break;
case GL_EQUIV:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~(src[i] ^ dest[i]);
}
}
break;
case GL_AND_REVERSE:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = src[i] & ~dest[i];
}
}
break;
case GL_AND_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~src[i] & dest[i];
}
}
break;
case GL_OR_REVERSE:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = src[i] | ~dest[i];
}
}
break;
case GL_OR_INVERTED:
for (i=0;i<n;i++) {
if (mask[i]) {
src[i] = ~src[i] | dest[i];
}
}
break;
default:
/* should never happen */
_mesa_problem(ctx, "Bad function in rgba_logicop");
}
}
/*
* Apply the current logic operator to a span of RGBA pixels.
* This is only used if the device driver can't do logic ops.
*/
void
_mesa_logicop_rgba_span( GLcontext *ctx,
GLuint n, GLint x, GLint y,
GLchan rgba[][4], const GLubyte mask[] )
{
GLchan dest[MAX_WIDTH][4];
_mesa_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
rgba_logicop( ctx, n, mask, (GLuint *) rgba, (const GLuint *) dest );
}
/*
* Apply the current logic operator to an array of RGBA pixels.
* This is only used if the device driver can't do logic ops.
*/
void
_mesa_logicop_rgba_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLchan rgba[][4], const GLubyte mask[] )
{
GLchan dest[PB_SIZE][4];
(*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask );
if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
_mesa_read_alpha_pixels( ctx, n, x, y, dest, mask );
}
rgba_logicop( ctx, n, mask, (GLuint *) rgba, (const GLuint *) dest );
}
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