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

   1 //
   2 // VIDEO.CPP: SDL/local hardware specific video routines
   3 //
   4 // by James L. Hammons
   5 // (C) 2010 Underground Software
   6 //
   7 // JLH = James L. Hammons <jlhamm@acm.org>
   8 //
   9 // Who  When        What
  10 // ---  ----------  -------------------------------------------------------------
  11 // JLH  01/16/2010  Created this log ;-)
  12 //
  13
  14 #include "video.h"
  15
  16 //#include "gui.h"                                                              // For "finished"
  17 #include "log.h"
  18 #include "tom.h"
  19 #include "sdlemu_opengl.h"
  20 #include "settings.h"
  21
  22 // External global variables
  23
  24 //shouldn't these exist here??? Prolly.
  25 //And now, they do! :-)
  26 SDL_Surface * surface, * mainSurface;
  27 SDL_Joystick * joystick1;
  28 Uint32 mainSurfaceFlags;
  29 //int16 * backbuffer;
  30 uint32 * backbuffer;
  31
  32 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
  33         #define RMASK 0xFF000000
  34         #define GMASK 0x00FF0000
  35         #define BMASK 0x0000FF00
  36         #define AMASK 0x000000FF
  37 #else
  38         #define RMASK 0x000000FF
  39         #define GMASK 0x0000FF00
  40         #define BMASK 0x00FF0000
  41         #define AMASK 0xFF000000
  42 #endif
  43
  44
  45 // One of the reasons why OpenGL is slower then normal SDL rendering, is because
  46 // the data is being pumped into the buffer every frame with a overflow as result.
  47 // So, we going tot render every 1 frame instead of every 0 frame.
  48
  49 // [Shamus] This isn't the case. OpenGL is slower because 60 frames a second is a
  50 //          lot of data to pump through the system. In any case, frameskip is probably
  51 //          a good idea for now, since most systems are probably too slow to run at
  52 //          60 FPS. But doing so will have some nasty side effects in some games.
  53 //          You have been warned!
  54
  55 int frame_ticker = 0;
  56
  57 //
  58 // Create SDL/OpenGL surfaces
  59 //
  60 bool VideoInit(void)
  61 {
  62         // Get proper info about the platform we're running on...
  63         const SDL_VideoInfo * info = SDL_GetVideoInfo();
  64
  65         if (!info)
  66         {
  67                 WriteLog("VJ: SDL is unable to get the video info: %s\n", SDL_GetError());
  68                 return false;
  69         }
  70
  71         if (vjs.useOpenGL)
  72         {
  73                 // Initializing SDL attributes with OpenGL
  74                 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
  75                 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
  76                 mainSurfaceFlags = SDL_OPENGL;
  77         }
  78         else
  79         {
  80                 if (info->hw_available)
  81                         mainSurfaceFlags = SDL_HWSURFACE | SDL_HWPALETTE | SDL_DOUBLEBUF;
  82
  83                 if (info->blit_hw)
  84                         mainSurfaceFlags |= SDL_HWACCEL;
  85         }
  86
  87         if (vjs.fullscreen)
  88                 mainSurfaceFlags |= SDL_FULLSCREEN;
  89
  90 /*      if (!vjs.useOpenGL)
  91 //              mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH, VIRTUAL_SCREEN_HEIGHT_NTSC, 16, mainSurfaceFlags);
  92                 mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH,
  93                         (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
  94                         16, mainSurfaceFlags);
  95         else
  96                 // When OpenGL is used, we're going to use a standard resolution of 640x480.
  97                 // This way we have good scaling functionality and when the screen is resized
  98                 // because of the NTSC <-> PAL resize, we only have to re-create the texture
  99                 // instead of initializing the entire OpenGL texture en screens.
 100                 mainSurface = SDL_SetVideoMode(640, 480, 16, mainSurfaceFlags);//*/
 101 //24BPP
 102         if (!vjs.useOpenGL)
 103 //              mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH, VIRTUAL_SCREEN_HEIGHT_NTSC, 16, mainSurfaceFlags);
 104                 mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH,
 105                         (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
 106                         32, mainSurfaceFlags);
 107         else
 108                 // When OpenGL is used, we're going to use a standard resolution of 640x480.
 109                 // This way we have good scaling functionality and when the screen is resized
 110                 // because of the NTSC <-> PAL resize, we only have to re-create the texture
 111                 // instead of initializing the entire OpenGL texture en screens.
 112                 mainSurface = SDL_SetVideoMode(640, 480, 32, mainSurfaceFlags);//*/
 113
 114         if (mainSurface == NULL)
 115         {
 116                 WriteLog("VJ: SDL is unable to set the video mode: %s\n", SDL_GetError());
 117                 return false;
 118         }
 119
 120         SDL_WM_SetCaption("Virtual Jaguar", "Virtual Jaguar");
 121
 122         // Create the primary SDL display (16 BPP, 5/5/5 RGB format)
 123 /*      surface = SDL_CreateRGBSurface(SDL_SWSURFACE, VIRTUAL_SCREEN_WIDTH,
 124                 (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
 125                 16, 0x7C00, 0x03E0, 0x001F, 0);//*/
 126
 127         uint32 vsWidth = (vjs.renderType == RT_TV ? 1280 : VIRTUAL_SCREEN_WIDTH),
 128                 vsHeight = (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL);
 129
 130 //      if (vjs.renderType == RT_TV)
 131 //              vsWidth = 1280;
 132 //24BPP
 133 //      surface = SDL_CreateRGBSurface(SDL_SWSURFACE, VIRTUAL_SCREEN_WIDTH,
 134         surface = SDL_CreateRGBSurface(SDL_SWSURFACE, vsWidth, vsHeight, 32, RMASK, GMASK, BMASK, AMASK);
 135
 136         if (surface == NULL)
 137         {
 138                 WriteLog("VJ: Could not create primary SDL surface: %s\n", SDL_GetError());
 139                 return false;
 140         }
 141
 142         if (vjs.useOpenGL)
 143                 // Let us setup OpenGL and our rendering texture. We give the src (surface) and the
 144                 // dst (mainSurface) display as well as the automatic bpp selection as options so that
 145                 // our texture is automatically created :)
 146                 sdlemu_init_opengl(surface, mainSurface, 1 /*method*/,
 147                         vjs.glFilter /*texture type (linear, nearest)*/,
 148                         0 /* Automatic bpp selection based upon src */);
 149
 150         // Initialize Joystick support under SDL
 151
 152         if (vjs.useJoystick)
 153         {
 154                 if (SDL_NumJoysticks() <= 0)
 155                 {
 156                         vjs.useJoystick = false;
 157                         printf("VJ: No joystick(s) or joypad(s) detected on your system. Using keyboard...\n");
 158                 }
 159                 else
 160                 {
 161                         if ((joystick1 = SDL_JoystickOpen(vjs.joyport)) == 0)
 162                         {
 163                                 vjs.useJoystick = false;
 164                                 printf("VJ: Unable to open a Joystick on port: %d\n", (int)vjs.joyport);
 165                         }
 166                         else
 167                                 printf("VJ: Using: %s\n", SDL_JoystickName(vjs.joyport));
 168                 }
 169         }
 170
 171         // Set up the backbuffer
 172         // To be safe, this should be 1280 * 625 * 2...
 173         backbuffer = (uint32 *)malloc(1280 * 625 * sizeof(uint32));
 174         memset(backbuffer, 0x44, VIRTUAL_SCREEN_WIDTH *
 175                 (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL)
 176                 * sizeof(uint32));
 177
 178         return true;
 179 }
 180
 181 //
 182 // Free various SDL components
 183 //
 184 void VideoDone(void)
 185 {
 186         if (vjs.useOpenGL)
 187                 sdlemu_close_opengl();
 188
 189         SDL_JoystickClose(joystick1);
 190         SDL_FreeSurface(surface);
 191         free(backbuffer);
 192 }
 193
 194 //
 195 // Render the backbuffer to the primary screen surface
 196 //
 197 void RenderBackbuffer(void)
 198 {
 199         // Handle frameskip *before* we do any heavy lifting here...
 200
 201         if (frame_ticker > 0)
 202         {
 203                 frame_ticker--;
 204                 return;
 205         }
 206
 207         frame_ticker = vjs.frameSkip;                           // Reset frame_ticker
 208
 209         if (SDL_MUSTLOCK(surface))
 210                 while (SDL_LockSurface(surface) < 0)
 211                         SDL_Delay(10);
 212
 213 //      memcpy(surface->pixels, backbuffer, tom_getVideoModeWidth() * tom_getVideoModeHeight() * 2);
 214 // This memcpy is expensive--do some profiling to see what the impact is!
 215         if (vjs.renderType == RT_NORMAL)
 216                 memcpy(surface->pixels, backbuffer, TOMGetVideoModeWidth() * TOMGetVideoModeHeight() * 4);
 217         else if (vjs.renderType == RT_TV)
 218                 memcpy(surface->pixels, backbuffer, 1280 * TOMGetVideoModeHeight() * 4);
 219
 220         if (SDL_MUSTLOCK(surface))
 221                 SDL_UnlockSurface(surface);
 222
 223         if (vjs.useOpenGL)
 224                 // One of the reasons why OpenGL is slower then normal SDL rendering, is because
 225                 // the data is being pumped into the buffer every frame with a overflow as result.
 226                 // So, we going to render every 1 fps instead of every 0 fps.
 227                 // [Shamus] This is isn't why it's slower--see top of file for explanation... ;-)
 228 //The problem lies in this function...
 229                 sdlemu_draw_texture(mainSurface, surface, 1/*1=GL_QUADS*/);
 230         else
 231         {
 232                 SDL_Rect rect = { 0, 0, surface->w, surface->h };
 233                 SDL_BlitSurface(surface, &rect, mainSurface, &rect);
 234                 SDL_Flip(mainSurface);
 235     }
 236 }
 237
 238 //
 239 // Resize the main SDL screen & backbuffer
 240 //
 241 void ResizeScreen(uint32 width, uint32 height)
 242 {
 243         SDL_FreeSurface(surface);
 244         surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32, RMASK, GMASK, BMASK, AMASK);
 245
 246         if (surface == NULL)
 247         {
 248                 WriteLog("Video: Could not create primary SDL surface: %s", SDL_GetError());
 249 //This is just crappy. We shouldn't exit this way--it leaves all kinds of memory leaks
 250 //as well as screwing up SDL... !!! FIX !!!
 251 //              exit(1);
 252                 // OK, this is cleaner. We can't continue if there is no surface created!
 253 #warning "!!! FIX !!! (finished = true)"
 254 //              finished = true;
 255         }
 256
 257         if (vjs.useOpenGL)
 258         {
 259                 // Recreate the texture because of the NTSC <-> PAL screen resize.
 260 //Not sure why this is here...
 261 //Is it because of the resized surface up above?
 262                 sdlemu_create_texture(surface, mainSurface, vjs.glFilter, 0);
 263         }
 264         else
 265         {
 266                 mainSurface = SDL_SetVideoMode(width, height, 32, mainSurfaceFlags);
 267
 268                 if (mainSurface == NULL)
 269                 {
 270                         WriteLog("Video: SDL is unable to set the video mode: %s\n", SDL_GetError());
 271 // Don't exit because we can't resize!
 272 //                      exit(1);
 273                 }
 274         }
 275
 276         char window_title[64];
 277
 278         sprintf(window_title, "Virtual Jaguar (%i x %i)", (int)width, (int)height);
 279         SDL_WM_SetCaption((vjs.useOpenGL ? "Virtual Jaguar (OpenGL)" : window_title), "Virtual Jaguar");
 280 }
 281
 282 //
 283 // Return the screen's width in pixels
 284 //
 285 uint32 GetSDLScreenWidthInPixels(void)
 286 {
 287         return surface->pitch / 4;                                              // Pitch / 4 since we're in 32BPP mode
 288 }
 289
 290 //
 291 // Fullscreen <-> window switching
 292 //
 293 void ToggleFullscreen(void)
 294 {
 295         // Set our internal variable, then toggle the SDL flag
 296         vjs.fullscreen = !vjs.fullscreen;
 297         mainSurfaceFlags ^= SDL_FULLSCREEN;
 298 //      mainSurfaceFlags = (vjs.fullscreen ? mainSurfaceFlags | SDL_FULLSCREEN :
 299 //              mainSurfaceFlags & ~SDL_FULLSCREEN);
 300
 301 //      mainSurfaceFlags &= ~SDL_FULLSCREEN;
 302
 303 //      if (vjs.fullscreen)
 304 //              mainSurfaceFlags |= SDL_FULLSCREEN;
 305
 306         if (vjs.useOpenGL)
 307         {
 308                 // When OpenGL is used, we're going to use a standard resolution of 640x480.
 309                 // This way we have good scaling functionality and when the screen is resized
 310                 // because of the NTSC <-> PAL resize, we only have to re-create the texture
 311                 // instead of initializing the entire OpenGL texture en screens.
 312                 mainSurface = SDL_SetVideoMode(640, 480, 32, mainSurfaceFlags);
 313
 314                 // Reset viewport, etc.
 315                 glViewport(0, 0, mainSurface->w, mainSurface->h);
 316                 glMatrixMode(GL_PROJECTION);
 317                 glPushMatrix();
 318                 glLoadIdentity();
 319                 glOrtho(0.0, (GLdouble)mainSurface->w, (GLdouble)mainSurface->h, 0.0, 0.0, 1.0);
 320                 glMatrixMode(GL_MODELVIEW);
 321                 glPushMatrix();
 322                 glLoadIdentity();
 323         }
 324         else
 325                 mainSurface = SDL_SetVideoMode(VIRTUAL_SCREEN_WIDTH,
 326                         (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL),
 327                         32, mainSurfaceFlags);
 328
 329         if (mainSurface == NULL)
 330         {
 331                 WriteLog("Video: SDL was unable to switch the video to %s: %s\n", (vjs.fullscreen ? "fullscreen" : "windowed"), SDL_GetError());
 332 // Shouldn't exit because we can't switch! BAD!!!
 333 //              exit(1);
 334                 return;
 335         }
 336
 337         SDL_WM_SetCaption((vjs.useOpenGL ? "Virtual Jaguar (OpenGL)" : "Virtual Jaguar"), "Virtual Jaguar");
 338
 339         return;
 340 }