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/* $Id: s_logic.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.
*/
#include "glheader.h"
#include "context.h"
#include "imports.h"
#include "macros.h"
#include "s_alphabuf.h"
#include "s_context.h"
#include "s_logic.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, const struct sw_span *span,
GLuint index[] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLuint dest[MAX_WIDTH];
ASSERT(span->end < MAX_WIDTH);
/* Read dest values from frame buffer */
if (span->arrayMask & SPAN_XY) {
(*swrast->Driver.ReadCI32Pixels)( ctx, span->end,
span->array->x, span->array->y,
dest, span->array->mask );
}
else {
(*swrast->Driver.ReadCI32Span)( ctx, span->end, span->x, span->y, dest );
}
index_logicop( ctx, span->end, index, dest, span->array->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_ui( 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] & dest[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");
}
}
/*
* As above, but operate on GLchan values
* Note: need to pass n = numPixels * 4.
*/
static void
rgba_logicop_chan( const GLcontext *ctx, GLuint n, const GLubyte mask[],
GLchan srcPtr[], const GLchan destPtr[] )
{
#if CHAN_TYPE == GL_FLOAT
GLuint *src = (GLuint *) srcPtr;
const GLuint *dest = (const GLuint *) destPtr;
GLuint i;
ASSERT(sizeof(GLfloat) == sizeof(GLuint));
#else
GLchan *src = srcPtr;
const GLchan *dest = destPtr;
GLuint i;
#endif
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] & dest[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.
* We can handle horizontal runs of pixels (spans) or arrays of x/y
* pixel coordinates.
*/
void
_mesa_logicop_rgba_span( GLcontext *ctx, const struct sw_span *span,
GLchan rgba[][4] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLchan dest[MAX_WIDTH][4];
ASSERT(span->end < MAX_WIDTH);
ASSERT(span->arrayMask & SPAN_RGBA);
if (span->arrayMask & SPAN_XY) {
(*swrast->Driver.ReadRGBAPixels)(ctx, span->end,
span->array->x, span->array->y,
dest, span->array->mask);
if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
_mesa_read_alpha_pixels(ctx, span->end,
span->array->x, span->array->y,
dest, span->array->mask);
}
}
else {
_mesa_read_rgba_span(ctx, ctx->DrawBuffer, span->end,
span->x, span->y, dest);
}
if (sizeof(GLchan) * 4 == sizeof(GLuint)) {
rgba_logicop_ui(ctx, span->end, span->array->mask,
(GLuint *) rgba, (const GLuint *) dest);
}
else {
rgba_logicop_chan(ctx, 4 * span->end, span->array->mask,
(GLchan *) rgba, (const GLchan *) dest);
}
}