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/* $Id: svgamesa16.c,v 1.11.36.1 2006/11/02 12:02:17 alanh Exp $ */
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* Mesa 3-D graphics library
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* Copyright (C) 1995-2002 Brian Paul
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* SVGA driver for Mesa.
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* Original author: Brian Paul
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* Additional authors: Slawomir Szczyrba <steev@hot.pl> (Mesa 3.2)
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#include "svgamesa16.h"
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#include "swrast/swrast.h"
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static void __svga_drawpixel16(int x, int y, unsigned long c)
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GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
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y = SVGAInfo->height-y-1;
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offset = y * SVGAInfo->width + x;
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shortBuffer[offset]=c;
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static unsigned long __svga_getpixel16(int x, int y)
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GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
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y = SVGAInfo->height-y-1;
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offset = y * SVGAInfo->width + x;
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return shortBuffer[offset];
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void __clear_color16( GLcontext *ctx, const GLfloat color[4] )
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CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
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CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
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CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
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SVGAMesa->clear_hicolor = (col[0] >> 3) << 11 |
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/* SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
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void __clear16( GLcontext *ctx, GLbitfield mask )
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int x = ctx->DrawBuffer->_Xmin;
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int y = ctx->DrawBuffer->_Ymin;
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int width = ctx->DrawBuffer->_Xmax - x;
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int height = ctx->DrawBuffer->_Ymax - y;
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GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
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if (mask & DD_FRONT_LEFT_BIT) {
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GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
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for (i=0;i<SVGABuffer.BufferSize / 2;i++)
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shortBuffer[i]=SVGAMesa->clear_hicolor;
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GLubyte *tmp = SVGABuffer.DrawBuffer;
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SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
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for (j=y;j<height;j++)
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__svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
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SVGABuffer.DrawBuffer = tmp;
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mask &= ~DD_FRONT_LEFT_BIT;
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if (mask & DD_BACK_LEFT_BIT) {
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GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
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for (i=0;i<SVGABuffer.BufferSize / 2;i++)
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shortBuffer[i]=SVGAMesa->clear_hicolor;
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GLubyte *tmp = SVGABuffer.DrawBuffer;
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SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
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for (i=x;i<width;i++)
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for (j=y;j<height;j++)
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__svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
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SVGABuffer.DrawBuffer = tmp;
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mask &= ~DD_BACK_LEFT_BIT;
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_swrast_Clear( ctx, mask );
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void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
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const GLubyte rgba[][4], const GLubyte mask[] )
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/* draw some pixels */
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for (i=0; i<n; i++, x++) {
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__svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
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(rgba[i][GCOMP]>>2)<<5 | \
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(rgba[i][BCOMP]>>3));
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/* draw all pixels */
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for (i=0; i<n; i++, x++) {
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__svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
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(rgba[i][GCOMP]>>2)<<5 | \
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(rgba[i][BCOMP]>>3));
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void __write_mono_rgba_span16( const GLcontext *ctx,
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GLuint n, GLint x, GLint y,
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const GLchan color[4], const GLubyte mask[])
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GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
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for (i=0; i<n; i++, x++) {
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__svga_drawpixel16( x, y, hicolor);
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void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
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for (i=0; i<n; i++, x++) {
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pix = __svga_getpixel16( x, y );
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rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
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rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
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rgba[i][BCOMP] = ((pix )<<3) & 0xff;
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void __write_rgba_pixels16( const GLcontext *ctx,
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GLuint n, const GLint x[], const GLint y[],
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const GLubyte rgba[][4], const GLubyte mask[] )
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for (i=0; i<n; i++) {
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__svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
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(rgba[i][GCOMP]>>2)<<5 | \
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(rgba[i][BCOMP]>>3));
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void __write_mono_rgba_pixels16( const GLcontext *ctx,
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const GLint x[], const GLint y[],
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const GLchan color[4], const GLubyte mask[] )
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GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
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for (i=0; i<n; i++) {
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__svga_drawpixel16( x[i], y[i], hicolor );
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void __read_rgba_pixels16( const GLcontext *ctx,
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GLuint n, const GLint x[], const GLint y[],
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GLubyte rgba[][4], const GLubyte mask[] )
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for (i=0; i<n; i++,x++) {
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pix = __svga_getpixel16( x[i], y[i] );
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rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
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rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
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rgba[i][BCOMP] = ((pix )<<3) & 0xff;
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/* silence compiler warning */
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extern void _mesa_svga16_dummy_function(void);
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void _mesa_svga16_dummy_function(void)