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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 2008 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
// SDL emulation of VGA 640x480x4 planar video mode,
// for Hexen startup loading screen.
//
//-----------------------------------------------------------------------------
#include "SDL.h"
#include "string.h"
#include "doomtype.h"
#include "i_timer.h"
// Palette fade-in takes two seconds
#define FADE_TIME 2000
#define HR_SCREENWIDTH 640
#define HR_SCREENHEIGHT 480
static SDL_Surface *hr_surface = NULL;
static char *window_title = "";
boolean I_SetVideoModeHR(void)
{
Uint32 flags;
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
return false;
}
SDL_WM_SetCaption(window_title, NULL);
flags = SDL_SWSURFACE | SDL_HWPALETTE | SDL_DOUBLEBUF;
hr_surface = SDL_SetVideoMode(HR_SCREENWIDTH, HR_SCREENHEIGHT, 8, flags);
if (hr_surface == NULL)
{
SDL_QuitSubSystem(SDL_INIT_VIDEO);
return false;
}
return true;
}
void I_SetWindowTitleHR(char *title)
{
window_title = title;
}
void I_UnsetVideoModeHR(void)
{
if (hr_surface != NULL)
{
SDL_QuitSubSystem(SDL_INIT_VIDEO);
hr_surface = NULL;
}
}
void I_ClearScreenHR(void)
{
SDL_Rect area = { 0, 0, HR_SCREENWIDTH, HR_SCREENHEIGHT };
SDL_FillRect(hr_surface, &area, 0);
}
void I_SlamBlockHR(int x, int y, int w, int h, const byte *src)
{
const byte *srcptrs[4];
byte srcbits[4];
byte *dest;
int x1, y1;
int i;
int bit;
// Set up source pointers to read from source buffer - each 4-bit
// pixel has its bits split into four sub-buffers
for (i=0; i<4; ++i)
{
srcptrs[i] = src + (i * w * h / 8);
}
if (SDL_LockSurface(hr_surface) < 0)
{
return;
}
// Draw each pixel
bit = 0;
for (y1=y; y1<y+h; ++y1)
{
dest = ((byte *) hr_surface->pixels) + y1 * hr_surface->pitch + x;
for (x1=x; x1<x+w; ++x1)
{
// Get the bits for this pixel
// For each bit, find the byte containing it, shift down
// and mask out the specific bit wanted.
for (i=0; i<4; ++i)
{
srcbits[i] = (srcptrs[i][bit / 8] >> (7 - (bit % 8))) & 0x1;
}
// Reassemble the pixel value
*dest = (srcbits[0] << 0)
| (srcbits[1] << 1)
| (srcbits[2] << 2)
| (srcbits[3] << 3);
// Next pixel!
++dest;
++bit;
}
}
SDL_UnlockSurface(hr_surface);
// Update the region we drew.
//SDL_UpdateRect(hr_surface, x, y, w, h);
SDL_Flip(hr_surface);
}
void I_SlamHR(const byte *buffer)
{
I_SlamBlockHR(0, 0, HR_SCREENWIDTH, HR_SCREENHEIGHT, buffer);
}
void I_InitPaletteHR(void)
{
// ...
}
void I_SetPaletteHR(const byte *palette)
{
SDL_Color sdlpal[16];
int i;
for (i=0; i<16; ++i)
{
sdlpal[i].r = palette[i * 3 + 0] * 4;
sdlpal[i].g = palette[i * 3 + 1] * 4;
sdlpal[i].b = palette[i * 3 + 2] * 4;
}
SDL_SetColors(hr_surface, sdlpal, 0, 16);
}
void I_FadeToPaletteHR(const byte *palette)
{
byte tmppal[16 * 3];
int starttime;
int elapsed;
int i;
starttime = I_GetTimeMS();
for (;;)
{
elapsed = I_GetTimeMS() - starttime;
if (elapsed >= FADE_TIME)
{
break;
}
// Generate the fake palette
for (i=0; i<16 * 3; ++i)
{
tmppal[i] = (palette[i] * elapsed) / FADE_TIME;
}
I_SetPaletteHR(tmppal);
SDL_Flip(hr_surface);
// Sleep a bit
I_Sleep(10);
}
// Set the final palette
I_SetPaletteHR(palette);
}
void I_BlackPaletteHR(void)
{
byte blackpal[16 * 3];
memset(blackpal, 0, sizeof(blackpal));
I_SetPaletteHR(blackpal);
}
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