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/* $Id: svgamesa16.c,v 1.4 2000/01/25 00:03:02 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
* Copyright (C) 1995-2000 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.
*/
/*
* SVGA driver for Mesa.
* Original author: Brian Paul
* Additional authors: Slawomir Szczyrba <steev@hot.pl> (Mesa 3.2)
*/
#ifdef SVGA
#include "svgapix.h"
#include "svgamesa16.h"
static void __svga_drawpixel16(int x, int y, unsigned long c)
{
unsigned long offset;
GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
y = SVGAInfo->height-y-1;
offset = y * SVGAInfo->width + x;
shortBuffer[offset]=c;
}
static unsigned long __svga_getpixel16(int x, int y)
{
unsigned long offset;
GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
y = SVGAInfo->height-y-1;
offset = y * SVGAInfo->width + x;
return shortBuffer[offset];
}
void __set_color16( GLcontext *ctx,
GLubyte red, GLubyte green,
GLubyte blue, GLubyte alpha )
{
SVGAMesa->hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
/* SVGAMesa->hicolor=(red)<<11 | (green)<<5 | (blue); */
}
void __clear_color16( GLcontext *ctx,
GLubyte red, GLubyte green,
GLubyte blue, GLubyte alpha )
{
SVGAMesa->clear_hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
/* SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
}
GLbitfield __clear16( GLcontext *ctx, GLbitfield mask, GLboolean all,
GLint x, GLint y, GLint width, GLint height )
{
int i,j;
if (mask & DD_FRONT_LEFT_BIT) {
if (all) {
GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
for (i=0;i<SVGABuffer.BufferSize / 2;i++)
shortBuffer[i]=SVGAMesa->clear_hicolor;
}
else {
GLubyte *tmp = SVGABuffer.DrawBuffer;
SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
for (i=x;i<width;i++)
for (j=y;j<height;j++)
__svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
SVGABuffer.DrawBuffer = tmp;
}
}
if (mask & DD_BACK_LEFT_BIT) {
if (all) {
GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
for (i=0;i<SVGABuffer.BufferSize / 2;i++)
shortBuffer[i]=SVGAMesa->clear_hicolor;
}
else {
GLubyte *tmp = SVGABuffer.DrawBuffer;
SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
for (i=x;i<width;i++)
for (j=y;j<height;j++)
__svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
SVGABuffer.DrawBuffer = tmp;
}
}
return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
}
void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
const GLubyte rgba[][4], const GLubyte mask[] )
{
int i;
if (mask) {
/* draw some pixels */
for (i=0; i<n; i++, x++) {
if (mask[i]) {
__svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
(rgba[i][GCOMP]>>2)<<5 | \
(rgba[i][BCOMP]>>3));
}
}
}
else {
/* draw all pixels */
for (i=0; i<n; i++, x++) {
__svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
(rgba[i][GCOMP]>>2)<<5 | \
(rgba[i][BCOMP]>>3));
}
}
}
void __write_mono_rgba_span16( const GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLubyte mask[])
{
int i;
for (i=0; i<n; i++, x++) {
if (mask[i]) {
__svga_drawpixel16( x, y, SVGAMesa->hicolor);
}
}
}
void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
GLubyte rgba[][4] )
{
int i,pix;
for (i=0; i<n; i++, x++) {
pix = __svga_getpixel16( x, y );
rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
rgba[i][BCOMP] = ((pix )<<3) & 0xff;
}
}
void __write_rgba_pixels16( const GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
const GLubyte rgba[][4], const GLubyte mask[] )
{
int i;
for (i=0; i<n; i++) {
if (mask[i]) {
__svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
(rgba[i][GCOMP]>>2)<<5 | \
(rgba[i][BCOMP]>>3));
}
}
}
void __write_mono_rgba_pixels16( const GLcontext *ctx,
GLuint n,
const GLint x[], const GLint y[],
const GLubyte mask[] )
{
int i;
/* use current rgb color */
for (i=0; i<n; i++) {
if (mask[i]) {
__svga_drawpixel16( x[i], y[i], SVGAMesa->hicolor );
}
}
}
void __read_rgba_pixels16( const GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLubyte rgba[][4], const GLubyte mask[] )
{
int i,pix;
for (i=0; i<n; i++,x++) {
pix = __svga_getpixel16( x[i], y[i] );
rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
rgba[i][BCOMP] = ((pix )<<3) & 0xff;
}
}
#endif
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