path: root/src/gallium/auxiliary/translate/translate_generic.c

/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/

 /*
  * Authors:
  *   Keith Whitwell <keith@tungstengraphics.com>
  */

#include "pipe/p_util.h"
#include "pipe/p_state.h"
#include "translate.h"


#define DRAW_DBG 0

typedef void (*fetch_func)(const void *ptr, float *attrib);
typedef void (*emit_func)(const float *attrib, void *ptr);



struct translate_generic {
   struct translate translate;

   struct {
      fetch_func fetch;
      unsigned buffer;
      unsigned input_offset;

      emit_func emit;
      unsigned output_offset;
      
      char *input_ptr;
      unsigned input_stride;

   } attrib[PIPE_MAX_ATTRIBS];

   unsigned nr_attrib;
};


static struct translate_generic *translate_generic( struct translate *translate )
{
   return (struct translate_generic *)translate;
}

/**
 * Fetch a float[4] vertex attribute from memory, doing format/type
 * conversion as needed.
 *
 * This is probably needed/dupliocated elsewhere, eg format
 * conversion, texture sampling etc.
 */
#define ATTRIB( NAME, SZ, TYPE, FROM, TO )		\
static void						\
fetch_##NAME(const void *ptr, float *attrib)		\
{							\
   const float defaults[4] = { 0,0,0,1 };	\
   int i;						\
							\
   for (i = 0; i < SZ; i++) {				\
      attrib[i] = FROM(i);				\
   }							\
							\
   for (; i < 4; i++) {					\
      attrib[i] = defaults[i];				\
   }							\
}							\
							\
static void						\
emit_##NAME(const float *attrib, void *ptr)		\
{  \
   unsigned i;						\
   TYPE *out = (TYPE *)ptr;				\
							\
   for (i = 0; i < SZ; i++) {				\
      out[i] = TO(attrib[i]);				\
   }							\
}


#define FROM_64_FLOAT(i)   ((float) ((double *) ptr)[i])
#define FROM_32_FLOAT(i)   (((float *) ptr)[i])

#define FROM_8_USCALED(i)  ((float) ((unsigned char *) ptr)[i])
#define FROM_16_USCALED(i) ((float) ((unsigned short *) ptr)[i])
#define FROM_32_USCALED(i) ((float) ((unsigned int *) ptr)[i])

#define FROM_8_SSCALED(i)  ((float) ((char *) ptr)[i])
#define FROM_16_SSCALED(i) ((float) ((short *) ptr)[i])
#define FROM_32_SSCALED(i) ((float) ((int *) ptr)[i])

#define FROM_8_UNORM(i)    ((float) ((unsigned char *) ptr)[i] / 255.0f)
#define FROM_16_UNORM(i)   ((float) ((unsigned short *) ptr)[i] / 65535.0f)
#define FROM_32_UNORM(i)   ((float) ((unsigned int *) ptr)[i] / 4294967295.0f)

#define FROM_8_SNORM(i)    ((float) ((char *) ptr)[i] / 127.0f)
#define FROM_16_SNORM(i)   ((float) ((short *) ptr)[i] / 32767.0f)
#define FROM_32_SNORM(i)   ((float) ((int *) ptr)[i] / 2147483647.0f)

#define TO_64_FLOAT(f)   ((double) f)
#define TO_32_FLOAT(f)   (f)

#define TO_8_USCALED(f)  ((unsigned char) f)
#define TO_16_USCALED(f) ((unsigned short) f)
#define TO_32_USCALED(f) ((unsigned int) f)

#define TO_8_SSCALED(f)  ((char) f)
#define TO_16_SSCALED(f) ((short) f)
#define TO_32_SSCALED(f) ((int) f)

#define TO_8_UNORM(f)    ((unsigned char) (f * 255.0f))
#define TO_16_UNORM(f)   ((unsigned short) (f * 65535.0f))
#define TO_32_UNORM(f)   ((unsigned int) (f * 4294967295.0f))

#define TO_8_SNORM(f)    ((char) (f * 127.0f))
#define TO_16_SNORM(f)   ((short) (f * 32767.0f))
#define TO_32_SNORM(f)   ((int) (f * 2147483647.0f))



ATTRIB( R64G64B64A64_FLOAT,   4, double, FROM_64_FLOAT, TO_64_FLOAT )
ATTRIB( R64G64B64_FLOAT,      3, double, FROM_64_FLOAT, TO_64_FLOAT )
ATTRIB( R64G64_FLOAT,         2, double, FROM_64_FLOAT, TO_64_FLOAT )
ATTRIB( R64_FLOAT,            1, double, FROM_64_FLOAT, TO_64_FLOAT )

ATTRIB( R32G32B32A32_FLOAT,   4, float, FROM_32_FLOAT, TO_32_FLOAT )
ATTRIB( R32G32B32_FLOAT,      3, float, FROM_32_FLOAT, TO_32_FLOAT )
ATTRIB( R32G32_FLOAT,         2, float, FROM_32_FLOAT, TO_32_FLOAT )
ATTRIB( R32_FLOAT,            1, float, FROM_32_FLOAT, TO_32_FLOAT )

ATTRIB( R32G32B32A32_USCALED, 4, unsigned, FROM_32_USCALED, TO_32_USCALED )
ATTRIB( R32G32B32_USCALED,    3, unsigned, FROM_32_USCALED, TO_32_USCALED )
ATTRIB( R32G32_USCALED,       2, unsigned, FROM_32_USCALED, TO_32_USCALED )
ATTRIB( R32_USCALED,          1, unsigned, FROM_32_USCALED, TO_32_USCALED )

ATTRIB( R32G32B32A32_SSCALED, 4, int, FROM_32_SSCALED, TO_32_SSCALED )
ATTRIB( R32G32B32_SSCALED,    3, int, FROM_32_SSCALED, TO_32_SSCALED )
ATTRIB( R32G32_SSCALED,       2, int, FROM_32_SSCALED, TO_32_SSCALED )
ATTRIB( R32_SSCALED,          1, int, FROM_32_SSCALED, TO_32_SSCALED )

ATTRIB( R32G32B32A32_UNORM, 4, unsigned, FROM_32_UNORM, TO_32_UNORM )
ATTRIB( R32G32B32_UNORM,    3, unsigned, FROM_32_UNORM, TO_32_UNORM )
ATTRIB( R32G32_UNORM,       2, unsigned, FROM_32_UNORM, TO_32_UNORM )
ATTRIB( R32_UNORM,          1, unsigned, FROM_32_UNORM, TO_32_UNORM )

ATTRIB( R32G32B32A32_SNORM, 4, int, FROM_32_SNORM, TO_32_SNORM )
ATTRIB( R32G32B32_SNORM,    3, int, FROM_32_SNORM, TO_32_SNORM )
ATTRIB( R32G32_SNORM,       2, int, FROM_32_SNORM, TO_32_SNORM )
ATTRIB( R32_SNORM,          1, int, FROM_32_SNORM, TO_32_SNORM )

ATTRIB( R16G16B16A16_USCALED, 4, ushort, FROM_16_USCALED, TO_16_USCALED )
ATTRIB( R16G16B16_USCALED,    3, ushort, FROM_16_USCALED, TO_16_USCALED )
ATTRIB( R16G16_USCALED,       2, ushort, FROM_16_USCALED, TO_16_USCALED )
ATTRIB( R16_USCALED,          1, ushort, FROM_16_USCALED, TO_16_USCALED )

ATTRIB( R16G16B16A16_SSCALED, 4, short, FROM_16_SSCALED, TO_16_SSCALED )
ATTRIB( R16G16B16_SSCALED,    3, short, FROM_16_SSCALED, TO_16_SSCALED )
ATTRIB( R16G16_SSCALED,       2, short, FROM_16_SSCALED, TO_16_SSCALED )
ATTRIB( R16_SSCALED,          1, short, FROM_16_SSCALED, TO_16_SSCALED )

ATTRIB( R16G16B16A16_UNORM, 4, ushort, FROM_16_UNORM, TO_16_UNORM )
ATTRIB( R16G16B16_UNORM,    3, ushort, FROM_16_UNORM, TO_16_UNORM )
ATTRIB( R16G16_UNORM,       2, ushort, FROM_16_UNORM, TO_16_UNORM )
ATTRIB( R16_UNORM,          1, ushort, FROM_16_UNORM, TO_16_UNORM )

ATTRIB( R16G16B16A16_SNORM, 4, short, FROM_16_SNORM, TO_16_SNORM )
ATTRIB( R16G16B16_SNORM,    3, short, FROM_16_SNORM, TO_16_SNORM )
ATTRIB( R16G16_SNORM,       2, short, FROM_16_SNORM, TO_16_SNORM )
ATTRIB( R16_SNORM,          1, short, FROM_16_SNORM, TO_16_SNORM )

ATTRIB( R8G8B8A8_USCALED,   4, ubyte, FROM_8_USCALED, TO_8_USCALED )
ATTRIB( R8G8B8_USCALED,     3, ubyte, FROM_8_USCALED, TO_8_USCALED )
ATTRIB( R8G8_USCALED,       2, ubyte, FROM_8_USCALED, TO_8_USCALED )
ATTRIB( R8_USCALED,         1, ubyte, FROM_8_USCALED, TO_8_USCALED )

ATTRIB( R8G8B8A8_SSCALED,  4, char, FROM_8_SSCALED, TO_8_SSCALED )
ATTRIB( R8G8B8_SSCALED,    3, char, FROM_8_SSCALED, TO_8_SSCALED )
ATTRIB( R8G8_SSCALED,      2, char, FROM_8_SSCALED, TO_8_SSCALED )
ATTRIB( R8_SSCALED,        1, char, FROM_8_SSCALED, TO_8_SSCALED )

ATTRIB( R8G8B8A8_UNORM,  4, ubyte, FROM_8_UNORM, TO_8_UNORM )
ATTRIB( R8G8B8_UNORM,    3, ubyte, FROM_8_UNORM, TO_8_UNORM )
ATTRIB( R8G8_UNORM,      2, ubyte, FROM_8_UNORM, TO_8_UNORM )
ATTRIB( R8_UNORM,        1, ubyte, FROM_8_UNORM, TO_8_UNORM )

ATTRIB( R8G8B8A8_SNORM,  4, char, FROM_8_SNORM, TO_8_SNORM )
ATTRIB( R8G8B8_SNORM,    3, char, FROM_8_SNORM, TO_8_SNORM )
ATTRIB( R8G8_SNORM,      2, char, FROM_8_SNORM, TO_8_SNORM )
ATTRIB( R8_SNORM,        1, char, FROM_8_SNORM, TO_8_SNORM )

ATTRIB( A8R8G8B8_UNORM,       4, ubyte, FROM_8_UNORM, TO_8_UNORM )
//ATTRIB( R8G8B8A8_UNORM,       4, ubyte, FROM_8_UNORM, TO_8_UNORM )



static void
fetch_B8G8R8A8_UNORM(const void *ptr, float *attrib)
{
   attrib[2] = FROM_8_UNORM(0);
   attrib[1] = FROM_8_UNORM(1);
   attrib[0] = FROM_8_UNORM(2);
   attrib[3] = FROM_8_UNORM(3);
}

static void
emit_B8G8R8A8_UNORM( const float *attrib, void *ptr)
{
   ubyte *out = (ubyte *)ptr;
   out[2] = TO_8_UNORM(attrib[0]);
   out[1] = TO_8_UNORM(attrib[1]);
   out[0] = TO_8_UNORM(attrib[2]);
   out[3] = TO_8_UNORM(attrib[3]);
}

static void 
fetch_NULL( const void *ptr, float *attrib )
{
   attrib[0] = 0;
   attrib[1] = 0;
   attrib[2] = 0;
   attrib[3] = 1;
}

static void 
emit_NULL( const float *attrib, void *ptr )
{
   /* do nothing is the only sensible option */
}

static fetch_func get_fetch_func( enum pipe_format format )
{
   switch (format) {
   case PIPE_FORMAT_R64_FLOAT:
      return fetch_R64_FLOAT;
   case PIPE_FORMAT_R64G64_FLOAT:
      return fetch_R64G64_FLOAT;
   case PIPE_FORMAT_R64G64B64_FLOAT:
      return fetch_R64G64B64_FLOAT;
   case PIPE_FORMAT_R64G64B64A64_FLOAT:
      return fetch_R64G64B64A64_FLOAT;

   case PIPE_FORMAT_R32_FLOAT:
      return fetch_R32_FLOAT;
   case PIPE_FORMAT_R32G32_FLOAT:
      return fetch_R32G32_FLOAT;
   case PIPE_FORMAT_R32G32B32_FLOAT:
      return fetch_R32G32B32_FLOAT;
   case PIPE_FORMAT_R32G32B32A32_FLOAT:
      return fetch_R32G32B32A32_FLOAT;

   case PIPE_FORMAT_R32_UNORM:
      return fetch_R32_UNORM;
   case PIPE_FORMAT_R32G32_UNORM:
      return fetch_R32G32_UNORM;
   case PIPE_FORMAT_R32G32B32_UNORM:
      return fetch_R32G32B32_UNORM;
   case PIPE_FORMAT_R32G32B32A32_UNORM:
      return fetch_R32G32B32A32_UNORM;

   case PIPE_FORMAT_R32_USCALED:
      return fetch_R32_USCALED;
   case PIPE_FORMAT_R32G32_USCALED:
      return fetch_R32G32_USCALED;
   case PIPE_FORMAT_R32G32B32_USCALED:
      return fetch_R32G32B32_USCALED;
   case PIPE_FORMAT_R32G32B32A32_USCALED:
      return fetch_R32G32B32A32_USCALED;

   case PIPE_FORMAT_R32_SNORM:
      return fetch_R32_SNORM;
   case PIPE_FORMAT_R32G32_SNORM:
      return fetch_R32G32_SNORM;
   case PIPE_FORMAT_R32G32B32_SNORM:
      return fetch_R32G32B32_SNORM;
   case PIPE_FORMAT_R32G32B32A32_SNORM:
      return fetch_R32G32B32A32_SNORM;

   case PIPE_FORMAT_R32_SSCALED:
      return fetch_R32_SSCALED;
   case PIPE_FORMAT_R32G32_SSCALED:
      return fetch_R32G32_SSCALED;
   case PIPE_FORMAT_R32G32B32_SSCALED:
      return fetch_R32G32B32_SSCALED;
   case PIPE_FORMAT_R32G32B32A32_SSCALED:
      return fetch_R32G32B32A32_SSCALED;

   case PIPE_FORMAT_R16_UNORM:
      return fetch_R16_UNORM;
   case PIPE_FORMAT_R16G16_UNORM:
      return fetch_R16G16_UNORM;
   case PIPE_FORMAT_R16G16B16_UNORM:
      return fetch_R16G16B16_UNORM;
   case PIPE_FORMAT_R16G16B16A16_UNORM:
      return fetch_R16G16B16A16_UNORM;

   case PIPE_FORMAT_R16_USCALED:
      return fetch_R16_USCALED;
   case PIPE_FORMAT_R16G16_USCALED:
      return fetch_R16G16_USCALED;
   case PIPE_FORMAT_R16G16B16_USCALED:
      return fetch_R16G16B16_USCALED;
   case PIPE_FORMAT_R16G16B16A16_USCALED:
      return fetch_R16G16B16A16_USCALED;

   case PIPE_FORMAT_R16_SNORM:
      return fetch_R16_SNORM;
   case PIPE_FORMAT_R16G16_SNORM:
      return fetch_R16G16_SNORM;
   case PIPE_FORMAT_R16G16B16_SNORM:
      return fetch_R16G16B16_SNORM;
   case PIPE_FORMAT_R16G16B16A16_SNORM:
      return fetch_R16G16B16A16_SNORM;

   case PIPE_FORMAT_R16_SSCALED:
      return fetch_R16_SSCALED;
   case PIPE_FORMAT_R16G16_SSCALED:
      return fetch_R16G16_SSCALED;
   case PIPE_FORMAT_R16G16B16_SSCALED:
      return fetch_R16G16B16_SSCALED;
   case PIPE_FORMAT_R16G16B16A16_SSCALED:
      return fetch_R16G16B16A16_SSCALED;

   case PIPE_FORMAT_R8_UNORM:
      return fetch_R8_UNORM;
   case PIPE_FORMAT_R8G8_UNORM:
      return fetch_R8G8_UNORM;
   case PIPE_FORMAT_R8G8B8_UNORM:
      return fetch_R8G8B8_UNORM;
   case PIPE_FORMAT_R8G8B8A8_UNORM:
      return fetch_R8G8B8A8_UNORM;

   case PIPE_FORMAT_R8_USCALED:
      return fetch_R8_USCALED;
   case PIPE_FORMAT_R8G8_USCALED:
      return fetch_R8G8_USCALED;
   case PIPE_FORMAT_R8G8B8_USCALED:
      return fetch_R8G8B8_USCALED;
   case PIPE_FORMAT_R8G8B8A8_USCALED:
      return fetch_R8G8B8A8_USCALED;

   case PIPE_FORMAT_R8_SNORM:
      return fetch_R8_SNORM;
   case PIPE_FORMAT_R8G8_SNORM:
      return fetch_R8G8_SNORM;
   case PIPE_FORMAT_R8G8B8_SNORM:
      return fetch_R8G8B8_SNORM;
   case PIPE_FORMAT_R8G8B8A8_SNORM:
      return fetch_R8G8B8A8_SNORM;

   case PIPE_FORMAT_R8_SSCALED:
      return fetch_R8_SSCALED;
   case PIPE_FORMAT_R8G8_SSCALED:
      return fetch_R8G8_SSCALED;
   case PIPE_FORMAT_R8G8B8_SSCALED:
      return fetch_R8G8B8_SSCALED;
   case PIPE_FORMAT_R8G8B8A8_SSCALED:
      return fetch_R8G8B8A8_SSCALED;

   case PIPE_FORMAT_A8R8G8B8_UNORM:
      return fetch_A8R8G8B8_UNORM;

   case PIPE_FORMAT_B8G8R8A8_UNORM:
      return fetch_B8G8R8A8_UNORM;

   default:
      assert(0); 
      return fetch_NULL;
   }
}




static emit_func get_emit_func( enum pipe_format format )
{
   switch (format) {
   case PIPE_FORMAT_R64_FLOAT:
      return emit_R64_FLOAT;
   case PIPE_FORMAT_R64G64_FLOAT:
      return emit_R64G64_FLOAT;
   case PIPE_FORMAT_R64G64B64_FLOAT:
      return emit_R64G64B64_FLOAT;
   case PIPE_FORMAT_R64G64B64A64_FLOAT:
      return emit_R64G64B64A64_FLOAT;

   case PIPE_FORMAT_R32_FLOAT:
      return emit_R32_FLOAT;
   case PIPE_FORMAT_R32G32_FLOAT:
      return emit_R32G32_FLOAT;
   case PIPE_FORMAT_R32G32B32_FLOAT:
      return emit_R32G32B32_FLOAT;
   case PIPE_FORMAT_R32G32B32A32_FLOAT:
      return emit_R32G32B32A32_FLOAT;

   case PIPE_FORMAT_R32_UNORM:
      return emit_R32_UNORM;
   case PIPE_FORMAT_R32G32_UNORM:
      return emit_R32G32_UNORM;
   case PIPE_FORMAT_R32G32B32_UNORM:
      return emit_R32G32B32_UNORM;
   case PIPE_FORMAT_R32G32B32A32_UNORM:
      return emit_R32G32B32A32_UNORM;

   case PIPE_FORMAT_R32_USCALED:
      return emit_R32_USCALED;
   case PIPE_FORMAT_R32G32_USCALED:
      return emit_R32G32_USCALED;
   case PIPE_FORMAT_R32G32B32_USCALED:
      return emit_R32G32B32_USCALED;
   case PIPE_FORMAT_R32G32B32A32_USCALED:
      return emit_R32G32B32A32_USCALED;

   case PIPE_FORMAT_R32_SNORM:
      return emit_R32_SNORM;
   case PIPE_FORMAT_R32G32_SNORM:
      return emit_R32G32_SNORM;
   case PIPE_FORMAT_R32G32B32_SNORM:
      return emit_R32G32B32_SNORM;
   case PIPE_FORMAT_R32G32B32A32_SNORM:
      return emit_R32G32B32A32_SNORM;

   case PIPE_FORMAT_R32_SSCALED:
      return emit_R32_SSCALED;
   case PIPE_FORMAT_R32G32_SSCALED:
      return emit_R32G32_SSCALED;
   case PIPE_FORMAT_R32G32B32_SSCALED:
      return emit_R32G32B32_SSCALED;
   case PIPE_FORMAT_R32G32B32A32_SSCALED:
      return emit_R32G32B32A32_SSCALED;

   case PIPE_FORMAT_R16_UNORM:
      return emit_R16_UNORM;
   case PIPE_FORMAT_R16G16_UNORM:
      return emit_R16G16_UNORM;
   case PIPE_FORMAT_R16G16B16_UNORM:
      return emit_R16G16B16_UNORM;
   case PIPE_FORMAT_R16G16B16A16_UNORM:
      return emit_R16G16B16A16_UNORM;

   case PIPE_FORMAT_R16_USCALED:
      return emit_R16_USCALED;
   case PIPE_FORMAT_R16G16_USCALED:
      return emit_R16G16_USCALED;
   case PIPE_FORMAT_R16G16B16_USCALED:
      return emit_R16G16B16_USCALED;
   case PIPE_FORMAT_R16G16B16A16_USCALED:
      return emit_R16G16B16A16_USCALED;

   case PIPE_FORMAT_R16_SNORM:
      return emit_R16_SNORM;
   case PIPE_FORMAT_R16G16_SNORM:
      return emit_R16G16_SNORM;
   case PIPE_FORMAT_R16G16B16_SNORM:
      return emit_R16G16B16_SNORM;
   case PIPE_FORMAT_R16G16B16A16_SNORM:
      return emit_R16G16B16A16_SNORM;

   case PIPE_FORMAT_R16_SSCALED:
      return emit_R16_SSCALED;
   case PIPE_FORMAT_R16G16_SSCALED:
      return emit_R16G16_SSCALED;
   case PIPE_FORMAT_R16G16B16_SSCALED:
      return emit_R16G16B16_SSCALED;
   case PIPE_FORMAT_R16G16B16A16_SSCALED:
      return emit_R16G16B16A16_SSCALED;

   case PIPE_FORMAT_R8_UNORM:
      return emit_R8_UNORM;
   case PIPE_FORMAT_R8G8_UNORM:
      return emit_R8G8_UNORM;
   case PIPE_FORMAT_R8G8B8_UNORM:
      return emit_R8G8B8_UNORM;
   case PIPE_FORMAT_R8G8B8A8_UNORM:
      return emit_R8G8B8A8_UNORM;

   case PIPE_FORMAT_R8_USCALED:
      return emit_R8_USCALED;
   case PIPE_FORMAT_R8G8_USCALED:
      return emit_R8G8_USCALED;
   case PIPE_FORMAT_R8G8B8_USCALED:
      return emit_R8G8B8_USCALED;
   case PIPE_FORMAT_R8G8B8A8_USCALED:
      return emit_R8G8B8A8_USCALED;

   case PIPE_FORMAT_R8_SNORM:
      return emit_R8_SNORM;
   case PIPE_FORMAT_R8G8_SNORM:
      return emit_R8G8_SNORM;
   case PIPE_FORMAT_R8G8B8_SNORM:
      return emit_R8G8B8_SNORM;
   case PIPE_FORMAT_R8G8B8A8_SNORM:
      return emit_R8G8B8A8_SNORM;

   case PIPE_FORMAT_R8_SSCALED:
      return emit_R8_SSCALED;
   case PIPE_FORMAT_R8G8_SSCALED:
      return emit_R8G8_SSCALED;
   case PIPE_FORMAT_R8G8B8_SSCALED:
      return emit_R8G8B8_SSCALED;
   case PIPE_FORMAT_R8G8B8A8_SSCALED:
      return emit_R8G8B8A8_SSCALED;

   case PIPE_FORMAT_A8R8G8B8_UNORM:
      return emit_A8R8G8B8_UNORM;

   case PIPE_FORMAT_B8G8R8A8_UNORM:
      return emit_B8G8R8A8_UNORM;

   default:
      assert(0); 
      return emit_NULL;
   }
}



/**
 * Fetch vertex attributes for 'count' vertices.
 */
static void generic_run_elts( struct translate *translate,
			      const unsigned *elts,
			      unsigned count,
			      void *output_buffer )
{
   struct translate_generic *tg = translate_generic(translate);
   char *vert = output_buffer;
   unsigned nr_attrs = tg->nr_attrib;
   unsigned attr;
   unsigned i;

   /* loop over vertex attributes (vertex shader inputs)
    */
   for (i = 0; i < count; i++) {
      unsigned elt = *elts++;

      for (attr = 0; attr < nr_attrs; attr++) {
	 float data[4];

	 const char *src = (tg->attrib[attr].input_ptr + 
			    tg->attrib[attr].input_stride * elt);

	 char *dst = (vert + 
		      tg->attrib[attr].output_offset);

	 tg->attrib[attr].fetch( src, data );
	 tg->attrib[attr].emit( data, dst );
      }
      
      vert += tg->translate.key.output_stride;
   }
}



static void generic_run( struct translate *translate,
			 unsigned start,
			 unsigned count,
			 void *output_buffer )
{
   struct translate_generic *tg = translate_generic(translate);
   char *vert = output_buffer;
   unsigned nr_attrs = tg->nr_attrib;
   unsigned attr;
   unsigned i;

   /* loop over vertex attributes (vertex shader inputs)
    */
   for (i = 0; i < count; i++) {
      unsigned elt = start + i;

      for (attr = 0; attr < nr_attrs; attr++) {
	 float data[4];

	 const char *src = (tg->attrib[attr].input_ptr + 
			    tg->attrib[attr].input_stride * elt);

	 char *dst = (vert + 
		      tg->attrib[attr].output_offset);

	 tg->attrib[attr].fetch( src, data );
	 tg->attrib[attr].emit( data, dst );
      }
      
      vert += tg->translate.key.output_stride;
   }
}


			       
static void generic_set_buffer( struct translate *translate,
				unsigned buf,
				const void *ptr,
				unsigned stride )
{
   struct translate_generic *tg = translate_generic(translate);
   unsigned i;

   for (i = 0; i < tg->nr_attrib; i++) {
      if (tg->attrib[i].buffer == buf) {
	 tg->attrib[i].input_ptr = ((char *)ptr +
				    tg->attrib[i].input_offset);
	 tg->attrib[i].input_stride = stride;
      }
   }
}


static void generic_release( struct translate *translate )
{
   /* Refcount?
    */
   FREE(translate);
}

struct translate *translate_generic_create( const struct translate_key *key )
{
   struct translate_generic *tg = CALLOC_STRUCT(translate_generic);
   unsigned i;

   if (tg == NULL)
      return NULL;

   tg->translate.key = *key;
   tg->translate.release = generic_release;
   tg->translate.set_buffer = generic_set_buffer;
   tg->translate.run_elts = generic_run_elts;
   tg->translate.run = generic_run;

   for (i = 0; i < key->nr_elements; i++) {

      tg->attrib[i].fetch = get_fetch_func(key->element[i].input_format);
      tg->attrib[i].buffer = key->element[i].input_buffer;
      tg->attrib[i].input_offset = key->element[i].input_offset;

      tg->attrib[i].emit = get_emit_func(key->element[i].output_format);
      tg->attrib[i].output_offset = key->element[i].output_offset;

   }

   tg->nr_attrib = key->nr_elements;


   return &tg->translate;
}