This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_fbriva.c
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SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
slouken@libsdl.org
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#include "SDL_config.h"
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#include "SDL_video.h"
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#include "../SDL_blit.h"
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#include "SDL_fbriva.h"
#include "riva_mmio.h"
#include "riva_regs.h"
static int FifoEmptyCount = 0;
static int FifoFreeCount = 0;
/* Wait for vertical retrace */
static void WaitVBL(_THIS)
{
volatile Uint8 *port = (Uint8 *)(mapped_io + PCIO_OFFSET + 0x3DA);
while ( (*port & 0x08) )
;
while ( !(*port & 0x08) )
;
}
static void NV3WaitIdle(_THIS)
{
RivaRop *Rop = (RivaRop *)(mapped_io + ROP_OFFSET);
while ( (Rop->FifoFree < FifoEmptyCount) ||
(*(mapped_io + PGRAPH_OFFSET + 0x000006B0) & 0x01) )
;
}
static void NV4WaitIdle(_THIS)
{
RivaRop *Rop = (RivaRop *)(mapped_io + ROP_OFFSET);
while ( (Rop->FifoFree < FifoEmptyCount) ||
(*(mapped_io + PGRAPH_OFFSET + 0x00000700) & 0x01) )
;
}
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#if 0 /* Not yet implemented? */
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/* Sets video mem colorkey and accelerated blit function */
static int SetHWColorKey(_THIS, SDL_Surface *surface, Uint32 key)
{
return(0);
}
/* Sets per surface hardware alpha value */
static int SetHWAlpha(_THIS, SDL_Surface *surface, Uint8 value)
{
return(0);
}
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#endif /* Not yet implemented */
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static int FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *rect, Uint32 color)
{
int dstX, dstY;
int dstW, dstH;
RivaBitmap *Bitmap = (RivaBitmap *)(mapped_io + BITMAP_OFFSET);
/* Don't blit to the display surface when switched away */
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if ( switched_away ) {
return -2; /* no hardware access */
}
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if ( dst == this->screen ) {
SDL_mutexP(hw_lock);
}
/* Set up the X/Y base coordinates */
dstW = rect->w;
dstH = rect->h;
FB_dst_to_xy(this, dst, &dstX, &dstY);
/* Adjust for the current rectangle */
dstX += rect->x;
dstY += rect->y;
RIVA_FIFO_FREE(Bitmap, 1);
Bitmap->Color1A = color;
RIVA_FIFO_FREE(Bitmap, 2);
Bitmap->UnclippedRectangle[0].TopLeft = (dstX << 16) | dstY;
Bitmap->UnclippedRectangle[0].WidthHeight = (dstW << 16) | dstH;
FB_AddBusySurface(dst);
if ( dst == this->screen ) {
SDL_mutexV(hw_lock);
}
return(0);
}
static int HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect)
{
SDL_VideoDevice *this = current_video;
int srcX, srcY;
int dstX, dstY;
int dstW, dstH;
RivaScreenBlt *Blt = (RivaScreenBlt *)(mapped_io + BLT_OFFSET);
/* FIXME: For now, only blit to display surface */
if ( dst->pitch != SDL_VideoSurface->pitch ) {
return(src->map->sw_blit(src, srcrect, dst, dstrect));
}
/* Don't blit to the display surface when switched away */
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if ( switched_away ) {
return -2; /* no hardware access */
}
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if ( dst == this->screen ) {
SDL_mutexP(hw_lock);
}
/* Calculate source and destination base coordinates (in pixels) */
dstW = dstrect->w;
dstH = dstrect->h;
FB_dst_to_xy(this, src, &srcX, &srcY);
FB_dst_to_xy(this, dst, &dstX, &dstY);
/* Adjust for the current blit rectangles */
srcX += srcrect->x;
srcY += srcrect->y;
dstX += dstrect->x;
dstY += dstrect->y;
RIVA_FIFO_FREE(Blt, 3);
Blt->TopLeftSrc = (srcY << 16) | srcX;
Blt->TopLeftDst = (dstY << 16) | dstX;
Blt->WidthHeight = (dstH << 16) | dstW;
FB_AddBusySurface(src);
FB_AddBusySurface(dst);
if ( dst == this->screen ) {
SDL_mutexV(hw_lock);
}
return(0);
}
static int CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst)
{
int accelerated;
/* Set initial acceleration on */
src->flags |= SDL_HWACCEL;
/* Set the surface attributes */
if ( (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
if ( ! this->info.blit_hw_A ) {
src->flags &= ~SDL_HWACCEL;
}
}
if ( (src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
if ( ! this->info.blit_hw_CC ) {
src->flags &= ~SDL_HWACCEL;
}
}
/* Check to see if final surface blit is accelerated */
accelerated = !!(src->flags & SDL_HWACCEL);
if ( accelerated ) {
src->map->hw_blit = HWAccelBlit;
}
return(accelerated);
}
void FB_RivaAccel(_THIS, __u32 card)
{
RivaRop *Rop = (RivaRop *)(mapped_io + ROP_OFFSET);
/* We have hardware accelerated surface functions */
this->CheckHWBlit = CheckHWBlit;
wait_vbl = WaitVBL;
switch (card) {
case FB_ACCEL_NV3:
wait_idle = NV3WaitIdle;
break;
case FB_ACCEL_NV4:
wait_idle = NV4WaitIdle;
break;
default:
/* Hmm... FIXME */
break;
}
FifoEmptyCount = Rop->FifoFree;
/* The Riva has an accelerated color fill */
this->info.blit_fill = 1;
this->FillHWRect = FillHWRect;
/* The Riva has accelerated normal and colorkey blits. */
this->info.blit_hw = 1;
#if 0 /* Not yet implemented? */
this->info.blit_hw_CC = 1;
this->SetHWColorKey = SetHWColorKey;
#endif
#if 0 /* Not yet implemented? */
/* The Riva has an accelerated alpha blit */
this->info.blit_hw_A = 1;
this->SetHWAlpha = SetHWAlpha;
#endif
}