Shamusworld >> Repos - virtualjaguar/blob - src/video.cpp

   1 //
   2 // VIDEO.CPP: SDL/local hardware specific video routines
   3 //
   4 // by James L. Hammons
   5 //
   6
   7 #include "video.h"
   8
   9 #include "gui.h"                                                                // For "finished"
  10 #include "log.h"
  11 #include "tom.h"
  12 #include "sdlemu_opengl.h"
  13 #include "settings.h"
  14
  15 // External global variables
  16
  17 //shouldn't these exist here??? Prolly.
  18 //And now, they do! :-)
  19 SDL_Surface * surface, * mainSurface;
  20 SDL_Joystick * joystick;
  21 Uint32 mainSurfaceFlags;
  22 //int16 * backbuffer;
  23 uint32 * backbuffer;
  24
  25 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
  26         #define RMASK 0xFF000000
  27         #define GMASK 0x00FF0000
  28         #define BMASK 0x0000FF00
  29         #define AMASK 0x000000FF
  30 #else
  31         #define RMASK 0x000000FF
  32         #define GMASK 0x0000FF00
  33         #define BMASK 0x00FF0000
  34         #define AMASK 0xFF000000
  35 #endif
  36
  37
  38 // One of the reasons why OpenGL is slower then normal SDL rendering, is because
  39 // the data is being pumped into the buffer every frame with a overflow as result.
  40 // So, we going tot render every 1 frame instead of every 0 frame.
  41
  42 // [Shamus] This isn't the case. OpenGL is slower because 60 frames a second is a
  43 //          lot of data to pump through the system. In any case, frameskip is probably
  44 //          a good idea for now, since most systems are probably too slow to run at
  45 //          60 FPS. But doing so will have some nasty side effects in some games.
  46 //          You have been warned!
  47
  48 int frame_ticker = 0;
  49
  50 //
  51 // Create SDL/OpenGL surfaces
  52 //
  53 bool VideoInit(void)
  54 {
  55         // Get proper info about the platform we're running on...
  56         const SDL_VideoInfo * info = SDL_GetVideoInfo();
  57
  58         if (!info)
  59         {
  60                 WriteLog("VJ: SDL is unable to get the video info: %s\n", SDL_GetError());
  61                 return false;
  62         }
  63
  64         if (vjs.useOpenGL)
  65         {
  66                 // Initializing SDL attributes with OpenGL
  67                 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
  68                 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
  69                 mainSurfaceFlags = SDL_OPENGL;
  70         }
  71         else
  72         {
  73                 if (info->hw_available)
  74                         mainSurfaceFlags = SDL_HWSURFACE | SDL_HWPALETTE | SDL_DOUBLEBUF;
  75
  76                 if (info->blit_hw)
  77                         mainSurfaceFlags |= SDL_HWACCEL;
  78         }
  79
  80         if (vjs.fullscreen)
  81                 mainSurfaceFlags |= SDL_FULLSCREEN;
  82
  83 /*      if (!vjs.useOpenGL)
  84 //              mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH, VIRTUAL_SCREEN_HEIGHT_NTSC, 16, mainSurfaceFlags);
  85                 mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH,
  86                         (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
  87                         16, mainSurfaceFlags);
  88         else
  89                 // When OpenGL is used, we're going to use a standard resolution of 640x480.
  90                 // This way we have good scaling functionality and when the screen is resized
  91                 // because of the NTSC <-> PAL resize, we only have to re-create the texture
  92                 // instead of initializing the entire OpenGL texture en screens.
  93                 mainSurface = SDL_SetVideoMode(640, 480, 16, mainSurfaceFlags);//*/
  94 //24BPP
  95         if (!vjs.useOpenGL)
  96 //              mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH, VIRTUAL_SCREEN_HEIGHT_NTSC, 16, mainSurfaceFlags);
  97                 mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH,
  98                         (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
  99                         32, mainSurfaceFlags);
 100         else
 101                 // When OpenGL is used, we're going to use a standard resolution of 640x480.
 102                 // This way we have good scaling functionality and when the screen is resized
 103                 // because of the NTSC <-> PAL resize, we only have to re-create the texture
 104                 // instead of initializing the entire OpenGL texture en screens.
 105                 mainSurface = SDL_SetVideoMode(640, 480, 32, mainSurfaceFlags);//*/
 106
 107         if (mainSurface == NULL)
 108         {
 109                 WriteLog("VJ: SDL is unable to set the video mode: %s\n", SDL_GetError());
 110                 return false;
 111         }
 112
 113         SDL_WM_SetCaption("Virtual Jaguar", "Virtual Jaguar");
 114
 115         // Create the primary SDL display (16 BPP, 5/5/5 RGB format)
 116 /*      surface = SDL_CreateRGBSurface(SDL_SWSURFACE, VIRTUAL_SCREEN_WIDTH,
 117                 (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
 118                 16, 0x7C00, 0x03E0, 0x001F, 0);//*/
 119
 120         uint32 vsWidth = (vjs.renderType == RT_TV ? 1280 : VIRTUAL_SCREEN_WIDTH),
 121                 vsHeight = (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL);
 122
 123 //      if (vjs.renderType == RT_TV)
 124 //              vsWidth = 1280;
 125 //24BPP
 126 //      surface = SDL_CreateRGBSurface(SDL_SWSURFACE, VIRTUAL_SCREEN_WIDTH,
 127         surface = SDL_CreateRGBSurface(SDL_SWSURFACE, vsWidth, vsHeight, 32, RMASK, GMASK, BMASK, AMASK);
 128
 129         if (surface == NULL)
 130         {
 131                 WriteLog("VJ: Could not create primary SDL surface: %s\n", SDL_GetError());
 132                 return false;
 133         }
 134
 135         if (vjs.useOpenGL)
 136                 // Let us setup OpenGL and our rendering texture. We give the src (surface) and the
 137                 // dst (mainSurface) display as well as the automatic bpp selection as options so that
 138                 // our texture is automatically created :)
 139                 sdlemu_init_opengl(surface, mainSurface, 1 /*method*/,
 140                         vjs.glFilter /*texture type (linear, nearest)*/,
 141                         0 /* Automatic bpp selection based upon src */);
 142
 143         // Initialize Joystick support under SDL
 144
 145         if (vjs.useJoystick)
 146         {
 147                 if (SDL_NumJoysticks() <= 0)
 148                 {
 149                         vjs.useJoystick = false;
 150                         printf("VJ: No joystick(s) or joypad(s) detected on your system. Using keyboard...\n");
 151                 }
 152                 else
 153                 {
 154                         if ((joystick = SDL_JoystickOpen(vjs.joyport)) == 0)
 155                         {
 156                                 vjs.useJoystick = false;
 157                                 printf("VJ: Unable to open a Joystick on port: %d\n", (int)vjs.joyport);
 158                         }
 159                         else
 160                                 printf("VJ: Using: %s\n", SDL_JoystickName(vjs.joyport));
 161                 }
 162         }
 163
 164         // Set up the backbuffer
 165         // To be safe, this should be 1280 * 625 * 2...
 166         backbuffer = (uint32 *)malloc(1280 * 625 * sizeof(uint32));
 167         memset(backbuffer, 0x44, VIRTUAL_SCREEN_WIDTH *
 168                 (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL)
 169                 * sizeof(uint32));
 170
 171         return true;
 172 }
 173
 174 //
 175 // Free various SDL components
 176 //
 177 void VideoDone(void)
 178 {
 179         if (vjs.useOpenGL)
 180                 sdlemu_close_opengl();
 181
 182         SDL_JoystickClose(joystick);
 183         SDL_FreeSurface(surface);
 184         free(backbuffer);
 185 }
 186
 187 //
 188 // Render the backbuffer to the primary screen surface
 189 //
 190 void RenderBackbuffer(void)
 191 {
 192         // Handle frameskip *before* we do any heavy lifting here...
 193
 194         if (frame_ticker > 0)
 195         {
 196                 frame_ticker--;
 197                 return;
 198         }
 199
 200         frame_ticker = vjs.frameSkip;                           // Reset frame_ticker
 201
 202         if (SDL_MUSTLOCK(surface))
 203                 while (SDL_LockSurface(surface) < 0)
 204                         SDL_Delay(10);
 205
 206 //      memcpy(surface->pixels, backbuffer, tom_getVideoModeWidth() * tom_getVideoModeHeight() * 2);
 207 // This memcpy is expensive--do some profiling to see what the impact is!
 208         if (vjs.renderType == RT_NORMAL)
 209                 memcpy(surface->pixels, backbuffer, TOMGetVideoModeWidth() * TOMGetVideoModeHeight() * 4);
 210         else if (vjs.renderType == RT_TV)
 211                 memcpy(surface->pixels, backbuffer, 1280 * TOMGetVideoModeHeight() * 4);
 212
 213         if (SDL_MUSTLOCK(surface))
 214                 SDL_UnlockSurface(surface);
 215
 216         if (vjs.useOpenGL)
 217                 // One of the reasons why OpenGL is slower then normal SDL rendering, is because
 218                 // the data is being pumped into the buffer every frame with a overflow as result.
 219                 // So, we going to render every 1 fps instead of every 0 fps.
 220                 // [Shamus] This is isn't why it's slower--see top of file for explanation... ;-)
 221 //The problem lies in this function...
 222                 sdlemu_draw_texture(mainSurface, surface, 1/*1=GL_QUADS*/);
 223         else
 224         {
 225                 SDL_Rect rect = { 0, 0, surface->w, surface->h };
 226                 SDL_BlitSurface(surface, &rect, mainSurface, &rect);
 227                 SDL_Flip(mainSurface);
 228     }
 229 }
 230
 231 //
 232 // Resize the main SDL screen & backbuffer
 233 //
 234 void ResizeScreen(uint32 width, uint32 height)
 235 {
 236         SDL_FreeSurface(surface);
 237         surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32, RMASK, GMASK, BMASK, AMASK);
 238
 239         if (surface == NULL)
 240         {
 241                 WriteLog("Video: Could not create primary SDL surface: %s", SDL_GetError());
 242 //This is just crappy. We shouldn't exit this way--it leaves all kinds of memory leaks
 243 //as well as screwing up SDL... !!! FIX !!!
 244 //              exit(1);
 245                 // OK, this is cleaner. We can't continue if there is no surface created!
 246                 finished = true;
 247         }
 248
 249         if (vjs.useOpenGL)
 250         {
 251                 // Recreate the texture because of the NTSC <-> PAL screen resize.
 252 //Not sure why this is here...
 253 //Is it because of the resized surface up above?
 254                 sdlemu_create_texture(surface, mainSurface, vjs.glFilter, 0);
 255         }
 256         else
 257         {
 258                 mainSurface = SDL_SetVideoMode(width, height, 32, mainSurfaceFlags);
 259
 260                 if (mainSurface == NULL)
 261                 {
 262                         WriteLog("Video: SDL is unable to set the video mode: %s\n", SDL_GetError());
 263 // Don't exit because we can't resize!
 264 //                      exit(1);
 265                 }
 266         }
 267
 268         char window_title[64];
 269
 270         sprintf(window_title, "Virtual Jaguar (%i x %i)", (int)width, (int)height);
 271         SDL_WM_SetCaption((vjs.useOpenGL ? "Virtual Jaguar (OpenGL)" : window_title), "Virtual Jaguar");
 272 }
 273
 274 //
 275 // Return the screen's width in pixels
 276 //
 277 uint32 GetSDLScreenWidthInPixels(void)
 278 {
 279         return surface->pitch / 4;                                              // Pitch / 4 since we're in 32BPP mode
 280 }
 281
 282 //
 283 // Fullscreen <-> window switching
 284 //
 285 void ToggleFullscreen(void)
 286 {
 287         // Set our internal variable, then toggle the SDL flag
 288         vjs.fullscreen = !vjs.fullscreen;
 289         mainSurfaceFlags ^= SDL_FULLSCREEN;
 290 //      mainSurfaceFlags = (vjs.fullscreen ? mainSurfaceFlags | SDL_FULLSCREEN :
 291 //              mainSurfaceFlags & ~SDL_FULLSCREEN);
 292
 293 //      mainSurfaceFlags &= ~SDL_FULLSCREEN;
 294
 295 //      if (vjs.fullscreen)
 296 //              mainSurfaceFlags |= SDL_FULLSCREEN;
 297
 298         if (vjs.useOpenGL)
 299         {
 300                 // When OpenGL is used, we're going to use a standard resolution of 640x480.
 301                 // This way we have good scaling functionality and when the screen is resized
 302                 // because of the NTSC <-> PAL resize, we only have to re-create the texture
 303                 // instead of initializing the entire OpenGL texture en screens.
 304                 mainSurface = SDL_SetVideoMode(640, 480, 32, mainSurfaceFlags);
 305
 306                 // Reset viewport, etc.
 307                 glViewport(0, 0, mainSurface->w, mainSurface->h);
 308                 glMatrixMode(GL_PROJECTION);
 309                 glPushMatrix();
 310                 glLoadIdentity();
 311                 glOrtho(0.0, (GLdouble)mainSurface->w, (GLdouble)mainSurface->h, 0.0, 0.0, 1.0);
 312                 glMatrixMode(GL_MODELVIEW);
 313                 glPushMatrix();
 314                 glLoadIdentity();
 315         }
 316         else
 317                 mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH,
 318                         (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
 319                         32, mainSurfaceFlags);
 320
 321         if (mainSurface == NULL)
 322         {
 323                 WriteLog("Video: SDL was unable to switch the video to %s: %s\n", (vjs.fullscreen ? "fullscreen" : "windowed"), SDL_GetError());
 324 // Shouldn't exit because we can't switch! BAD!!!
 325 //              exit(1);
 326                 return;
 327         }
 328
 329         SDL_WM_SetCaption((vjs.useOpenGL ? "Virtual Jaguar (OpenGL)" : "Virtual Jaguar"), "Virtual Jaguar");
 330
 331         return;
 332 }