Add a new function, driFillInModes, that is to be used by drivers to

create the set of support __GLcontextModes.  This should replace the
current driver-specific fill_in_modes functions.

1 files changed, 237 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/common/utils.c b/src/mesa/drivers/dri/common/utils.c
index 8574e06e75..e6823cfaee 100644
--- a/src/mesa/drivers/dri/common/utils.c
+++ b/src/mesa/drivers/dri/common/utils.c
@@ -1,5 +1,5 @@
 /*
- * (c) Copyright IBM Corporation 2002
+ * (C) Copyright IBM Corporation 2002, 2004
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -297,3 +297,239 @@ GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
 
    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 uint8_t * depth_bits, const uint8_t * stencil_bits,
+		unsigned num_depth_stencil_bits,
+		const GLenum * db_modes, unsigned num_db_modes,
+		int visType )
+{
+   static const uint8_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 uint32_t masks_table_rgb[8][4] = {
+      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+      { 0x000000F8, 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 uint32_t masks_table_rgba[8][4] = {
+      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+      { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+      { 0x000000F8, 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 uint32_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       */
+      { 0x000000F8, 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 uint32_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       */
+      { 0x000000F8, 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 uint8_t bytes_per_pixel[8] = {
+      0, 0, 0, 2, 2, 4, 0, 4
+   };
+
+   const uint8_t  * bits;
+   const uint32_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",
+	       __func__, __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",
+	       __func__, __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 = modes->next;
+	    }
+	}
+    }
+
+    *ptr_to_modes = modes;
+    return GL_TRUE;
+}