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/* GGI-Driver for MESA
*
* Copyright (C) 1997 Uwe Maurer
*
* 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.
* ---------------------------------------------------------------------
* This code was derived from the following source of information:
*
* svgamesa.c and ddsample.c by Brian Paul
*
*/
#include <ggi/mesa/ggimesa.h>
#include <ggi/mesa/ggimesa_int.h>
#define RMASK ((1<<R)-1)
#define GMASK ((1<<G)-1)
#define BMASK ((1<<B)-1)
#define RS (8-R)
#define GS (8-G)
#define BS (8-B)
/**********************************************************************/
/***** Write spans of pixels *****/
/**********************************************************************/
void GGIwrite_ci32_span(const GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLuint ci[],
const GLubyte mask[])
{
FB_TYPE *fb=LFB(FB_TYPE,x,FLIP(y));
if (mask)
{
while (n--) {
if (*mask++) *fb=*ci;
fb++;
ci++;
}
}
else
{
while (n--) *fb++ = *ci++;
}
}
void GGIwrite_ci8_span(const GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLubyte ci[],
const GLubyte mask[] )
{
FB_TYPE *fb=LFB(FB_TYPE,x,FLIP(y));
if (mask)
{
while (n--) {
if (*mask++) *fb=*ci;
fb++;
ci++;
}
}
else
{
while (n--) *fb++ = *ci++;
}
}
void GGIwrite_rgba_span(const GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLubyte rgba[][4],
const GLubyte mask[])
{
FB_TYPE *fb=LFB(FB_TYPE,x,FLIP(y));
if (mask)
{
while (n--) {
if (*mask++) {
*fb= ((rgba[0][RCOMP]>>RS) << (G+B)) |
((rgba[0][GCOMP]>>GS) << B) |
((rgba[0][BCOMP]>>BS));
}
fb++;
rgba++;
}
}
else
{
while (n--) {
*fb++= ((rgba[0][RCOMP]>>RS) << (G+B)) |
((rgba[0][GCOMP]>>GS) << B)|
((rgba[0][BCOMP]>>BS));
rgba++;
}
}
}
void GGIwrite_rgb_span( const GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLubyte rgba[][3],
const GLubyte mask[] )
{
FB_TYPE *fb=LFB(FB_TYPE,x,FLIP(y));
if (mask)
{
while (n--) {
if (*mask++) {
*fb= ((rgba[0][RCOMP]>>RS) << (G+B)) |
((rgba[0][GCOMP]>>GS) << B) |
((rgba[0][BCOMP]>>BS));
}
fb++;
rgba++;
}
}
else
{
while (n--) {
*fb++= ((rgba[0][RCOMP]>>RS) << (G+B)) |
((rgba[0][GCOMP]>>GS) << B) |
((rgba[0][BCOMP]>>BS));
rgba++;
}
}
}
void GGIwrite_mono_span( const GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLubyte mask[])
{
FB_TYPE *fb;
FB_TYPE color;
if (mask)
{
fb=LFB(FB_TYPE,x,FLIP(y));
color=(FB_TYPE) GGICTX->color;
while (n--)
{
if (*mask++) *fb=color;
fb++;
}
}
else
{
ggiDrawHLine(VIS,x,FLIP(y),n);
}
}
/**********************************************************************/
/***** Read spans of pixels *****/
/**********************************************************************/
void GGIread_ci32_span(const GLcontext *ctx,
GLuint n, GLint x, GLint y, GLuint ci[])
{
FB_TYPE *fb=LFB(FB_TYPE,x,FLIP(y));
while (n--)
*ci++=(GLuint)*fb++;
}
void GGIread_rgba_span(const GLcontext *ctx,
GLuint n, GLint x, GLint y,
GLubyte rgba[][4])
{
FB_TYPE *fb=LFB(FB_TYPE,x,FLIP(y));
FB_TYPE color;
while (n--)
{
color=*fb++;
rgba[0][RCOMP] = (GLubyte) (color>>(G+B))<<RS;
rgba[0][GCOMP] = (GLubyte) ((color>>B)& ((1<<G)-1))<<GS;
rgba[0][BCOMP] = (GLubyte) (color & ((1<<B)-1))<<BS;
rgba[0][ACOMP] =0;
rgba++;
}
}
/**********************************************************************/
/***** Write arrays of pixels *****/
/**********************************************************************/
void GGIwrite_ci32_pixels(const GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
const GLuint ci[], const GLubyte mask[] )
{
FB_TYPE *fb=LFB(FB_TYPE,0,0);
while (n--) {
if (*mask++) *(fb+ *x + FLIP(*y)*GGICTX->width)=*ci;
ci++;
x++;
y++;
}
}
void GGIwrite_mono_pixels(const GLcontext *ctx,
GLuint n,
const GLint x[], const GLint y[],
const GLubyte mask[] )
{
FB_TYPE *fb=LFB(FB_TYPE,0,0);
FB_TYPE color=(FB_TYPE) GGICTX->color;
while (n--) {
if (*mask++) *(fb+ *x + FLIP(*y)*GGICTX->width)=color;
x++;
y++;
}
}
void GGIwrite_rgba_pixels(const GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
const GLubyte rgba[][4],
const GLubyte mask[] )
{
FB_TYPE *fb=LFB(FB_TYPE,0,0);
FB_TYPE color;
while (n--) {
if (*mask++) {
color= ((rgba[0][RCOMP]>>RS) << (G+B)) |
((rgba[0][GCOMP]>>GS) << B) |
((rgba[0][BCOMP]>>BS));
*(fb+ *x + FLIP(*y)*GGICTX->width)=color;
}
x++;y++;
rgba++;
}
}
/**********************************************************************/
/***** Read arrays of pixels *****/
/**********************************************************************/
void GGIread_ci32_pixels(const GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLuint ci[], const GLubyte mask[])
{
FB_TYPE *fb=LFB(FB_TYPE,0,0);
while (n--) {
if (*mask++)
*ci=*(fb+ *x + FLIP(*y)*GGICTX->width);
ci++;
x++;
y++;
}
}
void GGIread_rgba_pixels(const GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLubyte rgba[][4],
const GLubyte mask[] )
{
FB_TYPE *fb=LFB(FB_TYPE,0,0);
FB_TYPE color;
while (n--)
{
if (*mask++)
{
color=*(fb+ *x + FLIP(*y)*GGICTX->width);
rgba[0][RCOMP] =(GLubyte)(color>>(G+B))<<RS;
rgba[0][GCOMP] =(GLubyte)((color>>B)& ((1<<G)-1))<<GS;
rgba[0][BCOMP] =(GLubyte) (color & ((1<<B)-1))<<BS;
rgba[0][ACOMP] =0;
}
x++; y++;
rgba++;
}
}
int GGIsetup_driver(GGIMesaContext ggictx,struct ggi_mesa_info *info)
{
GLcontext *ctx=ggictx->gl_ctx;
ctx->Driver.WriteRGBASpan = GGIwrite_rgba_span;
ctx->Driver.WriteRGBSpan = GGIwrite_rgb_span;
ctx->Driver.WriteMonoRGBASpan = GGIwrite_mono_span;
ctx->Driver.WriteRGBAPixels = GGIwrite_rgba_pixels;
ctx->Driver.WriteMonoRGBAPixels = GGIwrite_mono_pixels;
ctx->Driver.WriteCI32Span = GGIwrite_ci32_span;
ctx->Driver.WriteCI8Span = GGIwrite_ci8_span;
ctx->Driver.WriteMonoCISpan = GGIwrite_mono_span;
ctx->Driver.WriteCI32Pixels = GGIwrite_ci32_pixels;
ctx->Driver.WriteMonoCIPixels = GGIwrite_mono_pixels;
ctx->Driver.ReadCI32Span = GGIread_ci32_span;
ctx->Driver.ReadRGBASpan = GGIread_rgba_span;
ctx->Driver.ReadCI32Pixels = GGIread_ci32_pixels;
ctx->Driver.ReadRGBAPixels = GGIread_rgba_pixels;
info->red_bits=R;
info->green_bits=G;
info->blue_bits=B;
return 0;
}
static int GGIopen(ggi_visual_t vis,struct ggi_dlhandle *dlh,
const char *args,void *argptr, uint32 *dlret)
{
LIBGGI_MESAEXT(vis)->setup_driver=GGIsetup_driver;
*dlret = GGI_DL_OPDRAW;
return 0;
}
int DLOPENFUNC(int func, void **funcptr)
{
switch (func) {
case GGIFUNC_open:
*funcptr = GGIopen;
return 0;
case GGIFUNC_exit:
case GGIFUNC_close:
*funcptr = NULL;
return 0;
default:
*funcptr = NULL;
}
return GGI_ENOTFOUND;
}
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