utils.c

来自「mesa-6.5-minigui源码」· C语言 代码 · 共 696 行 · 第 1/2 页

 *
 * \todo
 * Now that the old \c driCheckDriDdxDrmVersions function is gone, this
 * function and \c driCheckDriDdxDrmVersions2 should be renamed.
 */
GLboolean
driCheckDriDdxDrmVersions3(const char * driver_name,
			   const __DRIversion * driActual,
			   const __DRIversion * driExpected,
			   const __DRIversion * ddxActual,
			   const __DRIutilversion2 * ddxExpected,
			   const __DRIversion * drmActual,
			   const __DRIversion * drmExpected)
{
   static const char format[] = "%s DRI driver expected %s version %d.%d.x "
       "but got version %d.%d.%d";
   static const char format2[] = "%s DRI driver expected %s version %d-%d.%d.x "
       "but got version %d.%d.%d";


   /* Check the DRI version */
   if ( (driActual->major != driExpected->major)
	|| (driActual->minor < driExpected->minor) ) {
      __driUtilMessage(format, driver_name, "DRI",
		       driExpected->major, driExpected->minor,
		       driActual->major, driActual->minor, driActual->patch);
      return GL_FALSE;
   }

   /* Check that the DDX driver version is compatible */
   if ( (ddxActual->major < ddxExpected->major_min)
	|| (ddxActual->major > ddxExpected->major_max)
	|| (ddxActual->minor < ddxExpected->minor) ) {
      __driUtilMessage(format2, driver_name, "DDX",
		       ddxExpected->major_min, ddxExpected->major_max, ddxExpected->minor,
		       ddxActual->major, ddxActual->minor, ddxActual->patch);
      return GL_FALSE;
   }
   
   /* Check that the DRM driver version is compatible */
   if ( (drmActual->major != drmExpected->major)
	|| (drmActual->minor < drmExpected->minor) ) {
      __driUtilMessage(format, driver_name, "DRM",
		       drmExpected->major, drmExpected->minor,
		       drmActual->major, drmActual->minor, drmActual->patch);
      return GL_FALSE;
   }

   return GL_TRUE;
}

GLboolean
driCheckDriDdxDrmVersions2(const char * driver_name,
			   const __DRIversion * driActual,
			   const __DRIversion * driExpected,
			   const __DRIversion * ddxActual,
			   const __DRIversion * ddxExpected,
			   const __DRIversion * drmActual,
			   const __DRIversion * drmExpected)
{
   __DRIutilversion2 ddx_expected;
   ddx_expected.major_min = ddxExpected->major;
   ddx_expected.major_max = ddxExpected->major;
   ddx_expected.minor = ddxExpected->minor;
   ddx_expected.patch = ddxExpected->patch;
   return driCheckDriDdxDrmVersions3(driver_name, driActual,
				driExpected, ddxActual, & ddx_expected,
				drmActual, drmExpected);
}



GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
				    GLint *x, GLint *y,
				    GLsizei *width, GLsizei *height )
{
   /* left clipping */
   if (*x < buffer->_Xmin) {
      *width -= (buffer->_Xmin - *x);
      *x = buffer->_Xmin;
   }

   /* right clipping */
   if (*x + *width > buffer->_Xmax)
      *width -= (*x + *width - buffer->_Xmax - 1);

   if (*width <= 0)
      return GL_FALSE;

   /* bottom clipping */
   if (*y < buffer->_Ymin) {
      *height -= (buffer->_Ymin - *y);
      *y = buffer->_Ymin;
   }

   /* top clipping */
   if (*y + *height > buffer->_Ymax)
      *height -= (*y + *height - buffer->_Ymax - 1);

   if (*height <= 0)
      return GL_FALSE;

   return GL_TRUE;
}



/**
 * Creates a set of \c __GLcontextModes that a driver will expose.
 * 
 * A set of \c __GLcontextModes will be created based on the supplied
 * parameters.  The number of modes processed will be 2 *
 * \c num_depth_stencil_bits * \c num_db_modes.
 * 
 * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
 * \c db_modes, and \c visType into each \c __GLcontextModes element.
 * However, the meanings of \c fb_format and \c fb_type require further
 * explanation.  The \c fb_format specifies which color components are in
 * each pixel and what the default order is.  For example, \c GL_RGB specifies
 * that red, green, blue are available and red is in the "most significant"
 * position and blue is in the "least significant".  The \c fb_type specifies
 * the bit sizes of each component and the actual ordering.  For example, if
 * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
 * are the blue value, bits [10:5] are the green value, and bits [4:0] are
 * the red value.
 * 
 * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
 * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
 * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
 * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
 * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
 * still uses 32-bits.
 *
 * If in doubt, look at the tables used in the function.
 * 
 * \param ptr_to_modes  Pointer to a pointer to a linked list of
 *                      \c __GLcontextModes.  Upon completion, a pointer to
 *                      the next element to be process will be stored here.
 *                      If the function fails and returns \c GL_FALSE, this
 *                      value will be unmodified, but some elements in the
 *                      linked list may be modified.
 * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
 *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
 * \param fb_type       Type of the pixels in the framebuffer.  Currently only
 *                      \c GL_UNSIGNED_SHORT_5_6_5, 
 *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
 *                      \c GL_UNSIGNED_INT_8_8_8_8, and
 *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
 * \param depth_bits    Array of depth buffer sizes to be exposed.
 * \param stencil_bits  Array of stencil buffer sizes to be exposed.
 * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
 *                      \c stencil_bits.
 * \param db_modes      Array of buffer swap modes.  If an element has a
 *                      value of \c GLX_NONE, then it represents a
 *                      single-buffered mode.  Other valid values are
 *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
 *                      \c GLX_SWAP_UNDEFINED_OML.  See the
 *                      GLX_OML_swap_method extension spec for more details.
 * \param num_db_modes  Number of entries in \c db_modes.
 * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
 *                      \c GLX_DIRECT_COLOR.
 * 
 * \returns
 * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
 * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
 * \c fb_type).
 * 
 * \todo
 * There is currently no way to support packed RGB modes (i.e., modes with
 * exactly 3 bytes per pixel) or floating-point modes.  This could probably
 * be done by creating some new, private enums with clever names likes
 * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32, 
 * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
 */
GLboolean
driFillInModes( __GLcontextModes ** ptr_to_modes,
		GLenum fb_format, GLenum fb_type,
		const u_int8_t * depth_bits, const u_int8_t * stencil_bits,
		unsigned num_depth_stencil_bits,
		const GLenum * db_modes, unsigned num_db_modes,
		int visType )
{
   static const u_int8_t bits_table[3][4] = {
     /* R  G  B  A */
      { 5, 6, 5, 0 }, /* Any GL_UNSIGNED_SHORT_5_6_5 */
      { 8, 8, 8, 0 }, /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
      { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
   };

   /* The following arrays are all indexed by the fb_type masked with 0x07.
    * Given the four supported fb_type values, this results in valid array
    * indices of 3, 4, 5, and 7.
    */
   static const u_int32_t masks_table_rgb[8][4] = {
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
      { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000 }, /* 8_8_8_8     */
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000 }  /* 8_8_8_8_REV */
   };

   static const u_int32_t masks_table_rgba[8][4] = {
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5       */
      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV   */
      { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF }, /* 8_8_8_8     */
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 }, /* 8_8_8_8_REV */
   };

   static const u_int32_t masks_table_bgr[8][4] = {
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
      { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000 }, /* 8_8_8_8     */
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000 }, /* 8_8_8_8_REV */
   };

   static const u_int32_t masks_table_bgra[8][4] = {
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5       */
      { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV   */
      { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF }, /* 8_8_8_8     */
      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
      { 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000 }, /* 8_8_8_8_REV */
   };

   static const u_int8_t bytes_per_pixel[8] = {
      0, 0, 0, 2, 2, 4, 0, 4
   };

   const u_int8_t  * bits;
   const u_int32_t * masks;
   const int index = fb_type & 0x07;
   __GLcontextModes * modes = *ptr_to_modes;
   unsigned i;
   unsigned j;
   unsigned k;


   if ( bytes_per_pixel[ index ] == 0 ) {
      fprintf( stderr, "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.\n",
	       __FUNCTION__, __LINE__, fb_type );
      return GL_FALSE;
   }


   /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
    * the _REV versions.
    *
    * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
    */

   switch ( fb_format ) {
      case GL_RGB:
         bits = (bytes_per_pixel[ index ] == 2)
	     ? bits_table[0] : bits_table[1];
         masks = masks_table_rgb[ index ];
         break;

      case GL_RGBA:
         bits = (bytes_per_pixel[ index ] == 2)
	     ? bits_table[0] : bits_table[2];
         masks = masks_table_rgba[ index ];
         break;

      case GL_BGR:
         bits = (bytes_per_pixel[ index ] == 2)
	     ? bits_table[0] : bits_table[1];
         masks = masks_table_bgr[ index ];
         break;

      case GL_BGRA:
         bits = (bytes_per_pixel[ index ] == 2)
	     ? bits_table[0] : bits_table[2];
         masks = masks_table_bgra[ index ];
         break;

      default:
         fprintf( stderr, "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.\n",
	       __FUNCTION__, __LINE__, fb_format );
         return GL_FALSE;
   }


    for ( k = 0 ; k < num_depth_stencil_bits ; k++ ) {
	for ( i = 0 ; i < num_db_modes ; i++ ) {
	    for ( j = 0 ; j < 2 ; j++ ) {

		modes->redBits   = bits[0];
		modes->greenBits = bits[1];
		modes->blueBits  = bits[2];
		modes->alphaBits = bits[3];
		modes->redMask   = masks[0];
		modes->greenMask = masks[1];
		modes->blueMask  = masks[2];
		modes->alphaMask = masks[3];
		modes->rgbBits   = modes->redBits + modes->greenBits
		    + modes->blueBits + modes->alphaBits;

		modes->accumRedBits   = 16 * j;
		modes->accumGreenBits = 16 * j;
		modes->accumBlueBits  = 16 * j;
		modes->accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;
		modes->visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;

		modes->stencilBits = stencil_bits[k];
		modes->depthBits = depth_bits[k];

		modes->visualType = visType;
		modes->renderType = GLX_RGBA_BIT;
		modes->drawableType = GLX_WINDOW_BIT;
		modes->rgbMode = GL_TRUE;

		if ( db_modes[i] == GLX_NONE ) {
		    modes->doubleBufferMode = GL_FALSE;
		}
		else {
		    modes->doubleBufferMode = GL_TRUE;
		    modes->swapMethod = db_modes[i];
		}

		modes->haveAccumBuffer = ((modes->accumRedBits +
					   modes->accumGreenBits +
					   modes->accumBlueBits +
					   modes->accumAlphaBits) > 0);
		modes->haveDepthBuffer = (modes->depthBits > 0);
		modes->haveStencilBuffer = (modes->stencilBits > 0);

		modes = modes->next;
	    }
	}
    }

    *ptr_to_modes = modes;
    return GL_TRUE;
}