Subversion Repositories Games.Rick Dangerous

/*

 * src/sysvid.c

 *

 * Copyright (C) 1998-2002 BigOrno (bigorno@bigorno.net). All rights reserved.

 *

 * The use and distribution terms for this software are contained in the file

 * named README, which can be found in the root of this distribution. By

 * using this software in any fashion, you are agreeing to be bound by the

 * terms of this license.

 *

 * You must not remove this notice, or any other, from this software.

 */

#include <malloc.h> // malloc

#include <memory.h> // memset

#include <SDL.h>

#include "system.h"

#include "game.h"

#include "img.h"

#define SYSVID_WIDTH 640

#define SYSVID_HEIGHT 480

#define SYSVID_BPP 32

U8 *sysvid_fb; // frame buffer

U8 want_fullscreen = TRUE;

U8 want_filter = TRUE;

U8 redraw_screen = FALSE;

static SDL_Surface *screen;

// Initialise video

void sysvid_init (void)

{

   // create frame buffer

   sysvid_fb = malloc (320 * 200);

   if (sysvid_fb == NULL)

      sys_panic ("Fatal error: frame buffer allocation failed.\n");

   // SDL init

   if (SDL_Init (SDL_INIT_VIDEO | SDL_INIT_TIMER) < 0)

      sys_panic ("Fatal error: could not initialize SDL.\n");

   SDL_WM_SetCaption ("Rick Dangerous", "Rick Dangerous");

   SDL_ShowCursor (SDL_DISABLE);

   // check video modes

   if (SDL_ListModes (NULL, SDL_FULLSCREEN) == 0)

      sys_panic ("Fatal error: SDL can not find an appropriate video mode.\n");

   // set video mode

   screen = SDL_SetVideoMode (SYSVID_WIDTH, SYSVID_HEIGHT, SYSVID_BPP, (want_fullscreen ? SDL_FULLSCREEN : 0));

}

// Shutdown video

void sysvid_shutdown (void)

{

   // destroy frame buffer

   if (sysvid_fb)

      free (sysvid_fb);

   sysvid_fb = NULL;

   // SDL quit

   SDL_Quit ();

}

// Clear screen

void sysvid_clear (void)

{

   memset (sysvid_fb, 0, 320 * 200);

}

// Update screen

void sysvid_paint (rect_t *rects)

{

   static SDL_Rect area;

   static rect_t rect_screen = {0, 0, 320, 200, NULL};

   static int pixel_size = SYSVID_BPP / 8;

   static int zoom = SYSVID_WIDTH / 320;

   static U8 palette[16][3] =

   {

      {0x00, 0x00, 0x00},

      {0xd8, 0x00, 0x00},

      {0xb0, 0x6c, 0x68},

      {0xf8, 0x90, 0x68},

      {0x20, 0x24, 0x20},

      {0x00, 0x48, 0xb0},

      {0x00, 0x6c, 0xd8},

      {0x20, 0x48, 0x00},

      {0x48, 0x6c, 0x20},

      {0x48, 0x24, 0x00},

      {0x90, 0x48, 0x00},

      {0xd8, 0x6c, 0x00},

      {0x48, 0x48, 0x48},

      {0x68, 0x6c, 0x68},

      {0x90, 0x90, 0x90},

      {0xb0, 0xb4, 0xb0}

   };

   U16 x, y, xz, yz;

   U8 *p, *q, *p0, *q0;

   if (rects == NULL)

      return;

   if (redraw_screen)

   {

      redraw_screen = FALSE;

      screen = SDL_SetVideoMode (SYSVID_WIDTH, SYSVID_HEIGHT, SYSVID_BPP, (want_fullscreen ? SDL_FULLSCREEN : 0));

      sysvid_paint (&rect_screen);

   }

   while (rects)

   {

      p0 = sysvid_fb;

      p0 += rects->x + rects->y * 320;

      q0 = (U8 *)screen->pixels;

      q0 += (pixel_size * rects->x + pixel_size * (rects->y + 20) * 320 * zoom) * zoom;

      for (y = (rects->y + 20); y < (rects->y + 20) + rects->height; y++)

      {

         for (yz = 0; yz < zoom; yz++)

         {

            p = p0;

            q = q0;

            for (x = rects->x; x < rects->x + rects->width; x++)

            {

               for (xz = 0; xz < zoom; xz++)

               {

                  if (want_filter && (y + yz < 220))

                  {

                     *(q + 0) = (U8) ((  (U32) ((zoom - xz) * (U32) palette[*(   p   )][2]

                                                +    xz     * (U32) palette[*( p + 1 )][2])

                                       + (U32) ((zoom - yz) * (U32) palette[*(   p   )][2]

                                                +    yz     * (U32) palette[*(p + 320)][2]))

                                      / (zoom * zoom));

                     *(q + 1) = (U8) ((  (U32) ((zoom - xz) * (U32) palette[*(   p   )][1]

                                                +    xz     * (U32) palette[*( p + 1 )][1])

                                       + (U32) ((zoom - yz) * (U32) palette[*(   p   )][1]

                                                +    yz     * (U32) palette[*(p + 320)][1]))

                                      / (zoom * zoom));

                     *(q + 2) = (U8) ((  (U32) ((zoom - xz) * (U32) palette[*(   p   )][0]

                                                +    xz     * (U32) palette[*( p + 1 )][0])

                                       + (U32) ((zoom - yz) * (U32) palette[*(   p   )][0]

                                                +    yz     * (U32) palette[*(p + 320)][0]))

                                      / (zoom * zoom));

                     *(q + 3) = 0;

                  }

                  else

                  {

                     *(q + 0) = palette[*p][2];

                     *(q + 1) = palette[*p][1];

                     *(q + 2) = palette[*p][0];

                     *(q + 3) = 0;

                  }

                  q += pixel_size;

               }

               p++;

            }

            q0 += 320 * pixel_size * zoom;

         }

         p0 += 320;

      }

      area.x = rects->x * zoom;

      area.y = (rects->y + 20) * zoom;

      area.h = rects->height * zoom;

      area.w = rects->width * zoom;

      SDL_UpdateRects (screen, 1, &area);

      rects = rects->next;

   }

}