stw_wgl_arbpixelformat.h File Reference

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Functions
WINGDIAPI BOOL APIENTRY	wglChoosePixelFormatARB (HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats)
WINGDIAPI BOOL APIENTRY	wglGetPixelFormatAttribfvARB (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, const int *piAttributes, FLOAT *pfValues)
WINGDIAPI BOOL APIENTRY	wglGetPixelFormatAttribivARB (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, const int *piAttributes, int *piValues)

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Function Documentation

WINGDIAPI BOOL APIENTRY wglChoosePixelFormatARB	(	HDC	hdc,
		const int *	piAttribIList,
		const FLOAT *	pfAttribFList,
		UINT	nMaxFormats,
		int *	piFormats,
		UINT *	nNumFormats
	)

Definition at line 383 of file stw_wgl_arbpixelformat.c.

References FALSE, FREE, pixelformat_score::index, MALLOC, pixelformat_get_extended_count(), points(), pixelformat_score::points, score_pixelformats(), and TRUE.

{
   uint count;
   struct pixelformat_score *scores;
   uint i;

   *nNumFormats = 0;

   /* Allocate and initialize pixelformat score table -- better matches
    * have higher scores. Start with a high score and take out penalty
    * points for a mismatch when the match does not have to be exact.
    * Set a score to 0 if there is a mismatch for an exact match criteria.
    */
   count = pixelformat_get_extended_count();
   scores = (struct pixelformat_score *) MALLOC( count * sizeof( struct pixelformat_score ) );
   if (scores == NULL)
      return FALSE;
   for (i = 0; i < count; i++) {
      scores[i].points = 0x7fffffff;
      scores[i].index = i;
   }

   /* Given the attribute list calculate a score for each pixelformat.
    */
   if (piAttribIList != NULL) {
      while (*piAttribIList != 0) {
         if (!score_pixelformats( scores, count, piAttribIList[0], piAttribIList[1] )) {
            FREE( scores );
            return FALSE;
         }
         piAttribIList += 2;
      }
   }
   if (pfAttribFList != NULL) {
      while (*pfAttribFList != 0) {
         if (!score_pixelformats( scores, count, (int) pfAttribFList[0], (int) pfAttribFList[1] )) {
            FREE( scores );
            return FALSE;
         }
         pfAttribFList += 2;
      }
   }

   /* Bubble-sort the resulting scores. Pixelformats with higher scores go first.
    * TODO: Find out if there are any patent issues with it.
    */
   if (count > 1) {
      uint n = count;
      boolean swapped;

      do {
         swapped = FALSE;
         for (i = 1; i < n; i++) {
            if (scores[i - 1].points < scores[i].points) {
               struct pixelformat_score score = scores[i - 1];

               scores[i - 1] = scores[i];
               scores[i] = score;
               swapped = TRUE;
            }
         }
         n--;
      }
      while (swapped);
   }

   /* Return a list of pixelformats that are the best match.
    * Reject pixelformats with non-positive scores.
    */
   for (i = 0; i < count; i++) {
      if (scores[i].points > 0) {
         if (*nNumFormats < nMaxFormats)
            piFormats[*nNumFormats] = scores[i].index + 1;
         (*nNumFormats)++;
      }
   }

   FREE( scores );
   return TRUE;
}

WINGDIAPI BOOL APIENTRY wglGetPixelFormatAttribfvARB	(	HDC	hdc,
		int	iPixelFormat,
		int	iLayerPlane,
		UINT	nAttributes,
		const int *	piAttributes,
		FLOAT *	pfValues
	)

Definition at line 471 of file stw_wgl_arbpixelformat.c.

References FALSE, FLOAT, query_attrib(), TRUE, and UINT.

{
   UINT i;

   (void) hdc;

   for (i = 0; i < nAttributes; i++) {
      int value;

      if (!query_attrib( iPixelFormat, iLayerPlane, piAttributes[i], &value ))
         return FALSE;
      pfValues[i] = (FLOAT) value;
   }

   return TRUE;
}

WINGDIAPI BOOL APIENTRY wglGetPixelFormatAttribivARB	(	HDC	hdc,
		int	iPixelFormat,
		int	iLayerPlane,
		UINT	nAttributes,
		const int *	piAttributes,
		int *	piValues
	)

Definition at line 495 of file stw_wgl_arbpixelformat.c.

References FALSE, query_attrib(), TRUE, and UINT.

{
   UINT i;

   (void) hdc;

   for (i = 0; i < nAttributes; i++) {
      if (!query_attrib( iPixelFormat, iLayerPlane, piAttributes[i], &piValues[i] ))
         return FALSE;
   }

   return TRUE;
}

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