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/* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgatexcnv.c,v 1.1 2000/09/24 13:51:08 alanh Exp $ */
/*
* GLX Hardware Device Driver for Matrox Millenium G200
* Copyright (C) 1999 Wittawat Yamwong
*
* 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
* WITTAWAT YAMWONG, OR ANY OTHER CONTRIBUTORS 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.
*
*
* original by Wittawat Yamwong <Wittawat.Yamwong@stud.uni-hannover.de>
* 9/20/99 rewrite by John Carmack <johnc@idsoftware.com>
*/
#include <stdlib.h>
#include <stdio.h>
#include <GL/gl.h>
#include "mm.h"
#include "mgacontext.h"
#include "mgatex.h"
/*
* mgaConvertTexture
* Converts a mesa format texture to the apropriate hardware format
* Note that sometimes width may be larger than the texture, like 64x1
* for an 8x8 texture. This happens when we have to crutch the pitch
* limits of the mga by uploading a block of texels as a single line.
*/
void mgaConvertTexture( GLuint *destPtr, int texelBytes,
struct gl_texture_image *image,
int x, int y, int width, int height )
{
register int i, j;
GLubyte *src;
int stride;
if (0)
fprintf(stderr, "texture image %p\n", image->Data);
if (image->Data == 0)
return;
/* FIXME: g400 luminance_alpha internal format */
switch (texelBytes) {
case 1:
switch (image->Format) {
case GL_COLOR_INDEX:
case GL_INTENSITY:
case GL_LUMINANCE:
case GL_ALPHA:
src = (GLubyte *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 2 ; j ; j-- ) {
*destPtr++ = src[0] | ( src[1] << 8 ) | ( src[2] << 16 ) | ( src[3] << 24 );
src += 4;
}
src += stride;
}
break;
default:
goto format_error;
}
break;
case 2:
switch (image->Format) {
case GL_RGB:
src = (GLubyte *)image->Data + ( y * image->Width + x ) * 3;
stride = (image->Width - width) * 3;
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR565(src[0],src[1],src[2]) |
( MGAPACKCOLOR565(src[3],src[4],src[5]) << 16 );
src += 6;
}
src += stride;
}
break;
case GL_RGBA:
src = (GLubyte *)image->Data + ( y * image->Width + x ) * 4;
stride = (image->Width - width) * 4;
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(src[0],src[1],src[2],src[3]) |
( MGAPACKCOLOR4444(src[4],src[5],src[6],src[7]) << 16 );
src += 8;
}
src += stride;
}
break;
case GL_LUMINANCE:
src = (GLubyte *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
/* FIXME: should probably use 555 texture to get true grey */
*destPtr++ = MGAPACKCOLOR565(src[0],src[0],src[0]) |
( MGAPACKCOLOR565(src[1],src[1],src[1]) << 16 );
src += 2;
}
src += stride;
}
break;
case GL_INTENSITY:
src = (GLubyte *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(src[0],src[0],src[0],src[0]) |
( MGAPACKCOLOR4444(src[1],src[1],src[1],src[1]) << 16 );
src += 2;
}
src += stride;
}
break;
case GL_ALPHA:
src = (GLubyte *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(255,255,255,src[0]) |
( MGAPACKCOLOR4444(255,255,255,src[1]) << 16 );
src += 2;
}
src += stride;
}
break;
case GL_LUMINANCE_ALPHA:
src = (GLubyte *)image->Data + ( y * image->Width + x ) * 2;
stride = (image->Width - width) * 2;
for ( i = height ; i ; i-- ) {
for ( j = width >> 1 ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR4444(src[0],src[0],src[0],src[1]) |
( MGAPACKCOLOR4444(src[2],src[2],src[2],src[3]) << 16 );
src += 4;
}
src += stride;
}
break;
default:
goto format_error;
}
break;
case 4:
switch (image->Format) {
case GL_RGB:
src = (GLubyte *)image->Data + ( y * image->Width + x ) * 3;
stride = (image->Width - width) * 3;
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[1],src[2], 255);
src += 3;
}
src += stride;
}
break;
case GL_RGBA:
src = (GLubyte *)image->Data + ( y * image->Width + x ) * 4;
stride = (image->Width - width) * 4;
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[1],src[2],src[3]);
src += 4;
}
src += stride;
}
break;
case GL_LUMINANCE:
src = (GLubyte *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[0],src[0], 255);
src += 1;
}
src += stride;
}
break;
case GL_INTENSITY:
src = (GLubyte *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[0],src[0],src[0]);
src += 1;
}
src += stride;
}
break;
case GL_ALPHA:
src = (GLubyte *)image->Data + ( y * image->Width + x );
stride = (image->Width - width);
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(255,255,255,src[0]);
src += 1;
}
src += stride;
}
break;
case GL_LUMINANCE_ALPHA:
src = (GLubyte *)image->Data + ( y * image->Width + x ) * 2;
stride = (image->Width - width) * 2;
for ( i = height ; i ; i-- ) {
for ( j = width ; j ; j-- ) {
*destPtr++ = MGAPACKCOLOR8888(src[0],src[0],
src[0],src[1]);
src += 2;
}
src += stride;
}
break;
default:
goto format_error;
}
break;
default:
goto format_error;
}
return;
format_error:
fprintf(stderr, "Unsupported texelBytes %i, image->Format %i\n",
(int)texelBytes, (int)image->Format );
}
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