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SDL_fb3dfx.c
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SDL_fb3dfx.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2010 Sam Lantinga
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.
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.
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
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_video.h"
#include "../SDL_blit.h"
#include "SDL_fb3dfx.h"
#include "3dfx_mmio.h"
/* Wait for vertical retrace */
static void
WaitVBL(_THIS)
{
/* find start of retrace */
tdfx_waitidle();
while ((tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == STATUS_RETRACE);
/* wait until we're past the start */
while ((tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == 0);
}
static void
WaitIdle(_THIS)
{
tdfx_waitidle();
}
/* Sets video mem colorkey and accelerated blit function */
static int
SetHWColorKey(_THIS, SDL_Surface * surface, Uint32 key)
{
return (0);
}
static int
FillHWRect(_THIS, SDL_Surface * dst, SDL_Rect * rect, Uint32 color)
{
int bpp;
char *dst_base;
Uint32 format;
int dstX, dstY;
/* Don't blit to the display surface when switched away */
if (switched_away) {
return -2; /* no hardware access */
}
if (dst == this->screen) {
SDL_mutexP(hw_lock);
}
/* Set the destination pixel format */
dst_base = (char *) ((char *) dst->pixels - mapped_mem);
bpp = dst->format->BitsPerPixel;
format = dst->pitch | ((bpp + ((bpp == 8) ? 0 : 8)) << 13);
/* Calculate source and destination base coordinates */
dstX = rect->x;
dstY = rect->y;
/* Execute the fill command */
tdfx_wait(6);
tdfx_out32(DSTBASE, (Uint32) dst_base);
tdfx_out32(DSTFORMAT, format);
tdfx_out32(COLORFORE, color);
tdfx_out32(COMMAND_2D, COMMAND_2D_FILLRECT);
tdfx_out32(DSTSIZE, rect->w | (rect->h << 16));
tdfx_out32(LAUNCH_2D, dstX | (dstY << 16));
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 bpp;
Uint32 src_format;
Uint32 dst_format;
char *src_base;
char *dst_base;
int srcX, srcY;
int dstX, dstY;
Uint32 blitop;
Uint32 use_colorkey;
/* Don't blit to the display surface when switched away */
if (switched_away) {
return -2; /* no hardware access */
}
if (dst == this->screen) {
SDL_mutexP(hw_lock);
}
/* Set the source and destination pixel format */
src_base = (char *) ((char *) src->pixels - mapped_mem);
bpp = src->format->BitsPerPixel;
src_format = src->pitch | ((bpp + ((bpp == 8) ? 0 : 8)) << 13);
dst_base = (char *) ((char *) dst->pixels - mapped_mem);
bpp = dst->format->BitsPerPixel;
dst_format = dst->pitch | ((bpp + ((bpp == 8) ? 0 : 8)) << 13);
srcX = srcrect->x;
srcY = srcrect->y;
dstX = dstrect->x;
dstY = dstrect->y;
/* Assemble the blit operation */
blitop = COMMAND_2D_BITBLT | (0xCC << 24);
if (srcX <= dstX) {
blitop |= BIT(14);
srcX += (dstrect->w - 1);
dstX += (dstrect->w - 1);
}
if (srcY <= dstY) {
blitop |= BIT(15);
srcY += (dstrect->h - 1);
dstY += (dstrect->h - 1);
}
/* Perform the blit! */
if ((src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
tdfx_wait(3);
tdfx_out32(SRCCOLORKEYMIN, src->format->colorkey);
tdfx_out32(SRCCOLORKEYMAX, src->format->colorkey);
tdfx_out32(ROP_2D, 0xAA00);
use_colorkey = 1;
} else {
use_colorkey = 0;
}
tdfx_wait(9);
tdfx_out32(SRCBASE, (Uint32) src_base);
tdfx_out32(SRCFORMAT, src_format);
tdfx_out32(DSTBASE, (Uint32) dst_base);
tdfx_out32(DSTFORMAT, src_format);
tdfx_out32(COMMAND_2D, blitop);
tdfx_out32(COMMANDEXTRA_2D, use_colorkey);
tdfx_out32(DSTSIZE, dstrect->w | (dstrect->h << 16));
tdfx_out32(DSTXY, dstX | (dstY << 16));
tdfx_out32(LAUNCH_2D, srcX | (srcY << 16));
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_3DfxAccel(_THIS, __u32 card)
{
/* We have hardware accelerated surface functions */
this->CheckHWBlit = CheckHWBlit;
wait_vbl = WaitVBL;
wait_idle = WaitIdle;
/* Reset the 3Dfx controller */
tdfx_out32(BRESERROR0, 0);
tdfx_out32(BRESERROR1, 0);
/* The 3Dfx has an accelerated color fill */
this->info.blit_fill = 1;
this->FillHWRect = FillHWRect;
/* The 3Dfx has accelerated normal and colorkey blits */
this->info.blit_hw = 1;
this->info.blit_hw_CC = 1;
this->SetHWColorKey = SetHWColorKey;
}
/* vi: set ts=4 sw=4 expandtab: */