dlls/x11drv/xvidmode.c

   1 /*
   2  * DirectDraw XVidMode interface
   3  *
   4  * Copyright 2001 TransGaming Technologies, Inc.
   5  */
   6
   7 #include "config.h"
   8 #include <string.h>
   9
  10 /* FIXME: ChangeDisplaySettings ought to be able to use this */
  11
  12 #ifdef HAVE_LIBXXF86VM
  13
  14 #include "ts_xlib.h"
  15 #include "ts_xf86vmode.h"
  16 #include "x11drv.h"
  17 #include "x11ddraw.h"
  18 #include "xvidmode.h"
  19
  20 #include "windef.h"
  21 #include "wingdi.h"
  22 #include "ddrawi.h"
  23 #include "debugtools.h"
  24
  25 DEFAULT_DEBUG_CHANNEL(x11drv);
  26
  27 static int xf86vm_event, xf86vm_error, xf86vm_major, xf86vm_minor;
  28
  29 LPDDHALMODEINFO xf86vm_modes;
  30 unsigned xf86vm_mode_count;
  31 XF86VidModeModeInfo** modes;
  32
  33 #define CONVERT_MODE(dotclock) \
  34   info->dwWidth      = mode->hdisplay; \
  35   info->dwHeight     = mode->vdisplay; \
  36   info->wRefreshRate = dotclock * 1000 / (mode->htotal * mode->vtotal); \
  37   TRACE(" width=%ld, height=%ld, refresh=%d\n", \
  38         info->dwWidth, info->dwHeight, info->wRefreshRate); \
  39   /* XVidMode cannot change display depths... */ \
  40   /* let's not bother with filling out these then... */ \
  41   info->lPitch         = 0; \
  42   info->dwBPP          = 0; \
  43   info->wFlags         = 0; \
  44   info->dwRBitMask     = 0; \
  45   info->dwGBitMask     = 0; \
  46   info->dwBBitMask     = 0; \
  47   info->dwAlphaBitMask = 0;
  48
  49 static void convert_modeinfo(XF86VidModeModeInfo *mode, LPDDHALMODEINFO info)
  50 {
  51   CONVERT_MODE(mode->dotclock)
  52 }
  53
  54 static void convert_modeline(int dotclock, XF86VidModeModeLine *mode, LPDDHALMODEINFO info)
  55 {
  56   CONVERT_MODE(dotclock)
  57 }
  58
  59 void X11DRV_XF86VM_Init(void)
  60 {
  61   int nmodes, i;
  62
  63   if (xf86vm_major) return; /* already initialized? */
  64
  65   /* see if XVidMode is available */
  66   if (!TSXF86VidModeQueryExtension(display, &xf86vm_event, &xf86vm_error)) return;
  67   if (!TSXF86VidModeQueryVersion(display, &xf86vm_major, &xf86vm_minor)) return;
  68
  69   /* if in desktop mode, don't use XVidMode */
  70   if (X11DRV_GetXRootWindow() != DefaultRootWindow(display)) return;
  71
  72   /* retrieve modes */
  73   if (!TSXF86VidModeGetAllModeLines(display, DefaultScreen(display), &nmodes,
  74                                     &modes))
  75     return;
  76
  77   TRACE("XVidMode modes: count=%d\n", nmodes);
  78
  79   xf86vm_mode_count = nmodes;
  80   xf86vm_modes = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DDHALMODEINFO) * nmodes);
  81
  82   /* convert modes to DDHALMODEINFO format */
  83   for (i=0; i<nmodes; i++)
  84     convert_modeinfo(modes[i], &xf86vm_modes[i]);
  85
  86   TRACE("Enabling XVidMode\n");
  87 }
  88
  89 void X11DRV_XF86VM_Cleanup(void)
  90 {
  91   if (modes) TSXFree(modes);
  92 }
  93
  94 int X11DRV_XF86VM_GetCurrentMode(void)
  95 {
  96   XF86VidModeModeLine line;
  97   int dotclock, i;
  98   DDHALMODEINFO cmode;
  99
 100   if (!xf86vm_modes) return 0; /* no XVidMode */
 101
 102   TRACE("Querying XVidMode current mode\n");
 103   TSXF86VidModeGetModeLine(display, DefaultScreen(display), &dotclock, &line);
 104   convert_modeline(dotclock, &line, &cmode);
 105   for (i=0; i<xf86vm_mode_count; i++)
 106     if (memcmp(&xf86vm_modes[i], &cmode, sizeof(cmode)) == 0) {
 107       TRACE("mode=%d\n", i);
 108       return i;
 109     }
 110   ERR("unknown mode, shouldn't happen\n");
 111   return 0; /* return first mode */
 112 }
 113
 114 void X11DRV_XF86VM_SetCurrentMode(int mode)
 115 {
 116   if (!xf86vm_modes) return; /* no XVidMode */
 117
 118   TSXF86VidModeSwitchToMode(display, DefaultScreen(display), modes[mode]);
 119   TSXF86VidModeSetViewPort(display, DefaultScreen(display), 0, 0);
 120   TSXSync(display, False);
 121 }
 122
 123 void X11DRV_XF86VM_SetExclusiveMode(int lock)
 124 {
 125   if (!xf86vm_modes) return; /* no XVidMode */
 126
 127   TSXF86VidModeLockModeSwitch(display, DefaultScreen(display), lock);
 128 }
 129
 130 /* actual DirectDraw HAL stuff */
 131
 132 static DWORD PASCAL X11DRV_XF86VM_SetMode(LPDDHAL_SETMODEDATA data)
 133 {
 134   X11DRV_XF86VM_SetCurrentMode(data->dwModeIndex);
 135   X11DRV_DDHAL_SwitchMode(data->dwModeIndex, NULL);
 136   data->ddRVal = DD_OK;
 137   return DDHAL_DRIVER_HANDLED;
 138 }
 139
 140 int X11DRV_XF86VM_CreateDriver(LPDDHALINFO info)
 141 {
 142   if (!xf86vm_mode_count) return 0; /* no XVidMode */
 143
 144   info->dwNumModes = xf86vm_mode_count;
 145   info->lpModeInfo = xf86vm_modes;
 146   X11DRV_DDHAL_SwitchMode(X11DRV_XF86VM_GetCurrentMode(), NULL);
 147   info->lpDDCallbacks->SetMode = X11DRV_XF86VM_SetMode;
 148   return TRUE;
 149 }
 150
 151
 152 /***** GAMMA CONTROL *****/
 153 /* (only available in XF86VidMode 2.x) */
 154
 155 #ifdef X_XF86VidModeSetGamma
 156
 157 static void GenerateRampFromGamma(WORD ramp[256], float gamma)
 158 {
 159   float r_gamma = 1/gamma;
 160   unsigned i;
 161   TRACE("gamma is %f\n", r_gamma);
 162   for (i=0; i<256; i++)
 163     ramp[i] = pow(i/255.0, r_gamma) * 65535.0;
 164 }
 165
 166 static BOOL ComputeGammaFromRamp(WORD ramp[256], float *gamma)
 167 {
 168   float r_x, r_y, r_lx, r_ly, r_d, r_v, r_e, g_avg, g_min, g_max;
 169   unsigned i, f, l, g_n, c;
 170   f = ramp[0];
 171   l = ramp[255];
 172   if (f >= l) {
 173     ERR("inverted or flat gamma ramp (%d->%d), rejected\n", f, l);
 174     return FALSE;
 175   }
 176   r_d = l - f;
 177   g_min = g_max = g_avg = 0.0;
 178   /* check gamma ramp entries to estimate the gamma */
 179   TRACE("analyzing gamma ramp (%d->%d)\n", f, l);
 180   for (i=1, g_n=0; i<255; i++) {
 181     if (ramp[i] < f || ramp[i] > l) {
 182       ERR("strange gamma ramp ([%d]=%d for %d->%d), rejected\n", i, ramp[i], f, l);
 183       return FALSE;
 184     }
 185     c = ramp[i] - f;
 186     if (!c) continue; /* avoid log(0) */
 187
 188     /* normalize entry values into 0..1 range */
 189     r_x = i/255.0; r_y = c / r_d;
 190     /* compute logarithms of values */
 191     r_lx = log(r_x); r_ly = log(r_y);
 192     /* compute gamma for this entry */
 193     r_v = r_ly / r_lx;
 194     /* compute differential (error estimate) for this entry */
 195     /* some games use table-based logarithms that magnifies the error by 128 */
 196     r_e = -r_lx * 128 / (c * r_lx * r_lx);
 197
 198     /* compute min & max while compensating for estimated error */
 199     if (!g_n || g_min > (r_v + r_e)) g_min = r_v + r_e;
 200     if (!g_n || g_max < (r_v - r_e)) g_max = r_v - r_e;
 201
 202     /* add to average */
 203     g_avg += r_v;
 204     g_n++;
 205     /* TRACE("[%d]=%d, gamma=%f, error=%f\n", i, ramp[i], r_v, r_e); */
 206   }
 207   if (!g_n) {
 208     ERR("no gamma data, shouldn't happen\n");
 209     return FALSE;
 210   }
 211   g_avg /= g_n;
 212   TRACE("low bias is %d, high is %d, gamma is %5.3f\n", f, 65535-l, g_avg);
 213   /* the bias could be because the app wanted something like a "red shift"
 214    * like when you're hit in Quake, but XVidMode doesn't support it,
 215    * so we have to reject a significant bias */
 216   if (f && f > (pow(1/255.0, g_avg) * 65536.0)) {
 217     ERR("low-biased gamma ramp (%d), rejected\n", f);
 218     return FALSE;
 219   }
 220   /* check that the gamma is reasonably uniform across the ramp */
 221   if (g_max - g_min > 0.1) {
 222     ERR("ramp not uniform (max=%f, min=%f, avg=%f), rejected\n", g_max, g_min, g_avg);
 223     return FALSE;
 224   }
 225   /* ok, now we're pretty sure we can set the desired gamma ramp,
 226    * so go for it */
 227   *gamma = 1/g_avg;
 228   return TRUE;
 229 }
 230
 231 #endif /* X_XF86VidModeSetGamma */
 232
 233 /* Hmm... should gamma control be available in desktop mode or not?
 234  * I'll assume that it should */
 235
 236 BOOL X11DRV_XF86VM_GetGammaRamp(LPDDGAMMARAMP ramp)
 237 {
 238 #ifdef X_XF86VidModeSetGamma
 239   XF86VidModeGamma gamma;
 240   Bool ret;
 241
 242   if (xf86vm_major < 2) return FALSE; /* no gamma control */
 243   wine_tsx11_lock();
 244   ret = XF86VidModeGetGamma(display, DefaultScreen(display), &gamma);
 245   wine_tsx11_unlock();
 246   if (ret) {
 247     GenerateRampFromGamma(ramp->red,   gamma.red);
 248     GenerateRampFromGamma(ramp->green, gamma.green);
 249     GenerateRampFromGamma(ramp->blue,  gamma.blue);
 250     return TRUE;
 251   }
 252 #endif /* X_XF86VidModeSetGamma */
 253   return FALSE;
 254 }
 255
 256 BOOL X11DRV_XF86VM_SetGammaRamp(LPDDGAMMARAMP ramp)
 257 {
 258 #ifdef X_XF86VidModeSetGamma
 259   XF86VidModeGamma gamma;
 260
 261   if (xf86vm_major < 2) return FALSE; /* no gamma control */
 262   if (ComputeGammaFromRamp(ramp->red,   &gamma.red) &&
 263       ComputeGammaFromRamp(ramp->green, &gamma.green) &&
 264       ComputeGammaFromRamp(ramp->blue,  &gamma.blue)) {
 265     Bool ret;
 266     wine_tsx11_lock();
 267     ret = XF86VidModeSetGamma(display, DefaultScreen(display), &gamma);
 268     wine_tsx11_unlock();
 269     return ret;
 270   }
 271 #endif /* X_XF86VidModeSetGamma */
 272   return FALSE;
 273 }
 274
 275 #endif /* HAVE_LIBXXF86VM */
 276
 277 /* FIXME: should move these somewhere appropriate, but probably not before
 278  * the stuff in graphics/x11drv/ has been moved to dlls/x11drv, so that
 279  * they can include xvidmode.h directly */
 280 BOOL X11DRV_GetDeviceGammaRamp(DC *dc, LPVOID ramp)
 281 {
 282 #ifdef HAVE_LIBXXF86VM
 283   return X11DRV_XF86VM_GetGammaRamp(ramp);
 284 #else
 285   return FALSE;
 286 #endif
 287 }
 288
 289 BOOL X11DRV_SetDeviceGammaRamp(DC *dc, LPVOID ramp)
 290 {
 291 #ifdef HAVE_LIBXXF86VM
 292   return X11DRV_XF86VM_SetGammaRamp(ramp);
 293 #else
 294   return FALSE;
 295 #endif
 296 }