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