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/**************************************************************************

 *

 * Copyright 2010 VMware, Inc.

 * 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 VMWARE 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.

 *

 **************************************************************************/

/**

 * @file

 * Pixel format accessor functions.

 *

 * @author Jose Fonseca 

 */

#include "u_math.h"

#include "u_memory.h"

#include "u_format.h"

#include "u_format_s3tc.h"

#include "u_surface.h"

#include "pipe/p_defines.h"

boolean

util_format_is_float(enum pipe_format format)

{

   const struct util_format_description *desc = util_format_description(format);

   unsigned i;

   assert(desc);

   if (!desc) {

      return FALSE;

   }

   i = util_format_get_first_non_void_channel(format);

   if (i == -1) {

      return FALSE;

   }

   return desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT ? TRUE : FALSE;

}

/** Test if the format contains RGB, but not alpha */

boolean

util_format_has_alpha(enum pipe_format format)

{

   const struct util_format_description *desc =

      util_format_description(format);

   return (desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||

           desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&

          desc->swizzle[3] != UTIL_FORMAT_SWIZZLE_1;

}

boolean

util_format_is_luminance(enum pipe_format format)

{

   const struct util_format_description *desc =

      util_format_description(format);

   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||

        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&

       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_1) {

      return TRUE;

   }

   return FALSE;

}

boolean

util_format_is_alpha(enum pipe_format format)

{

   const struct util_format_description *desc =

      util_format_description(format);

   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||

        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&

       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_0 &&

       desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0 &&

       desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0 &&

       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {

      return TRUE;

   }

   return FALSE;

}

boolean

util_format_is_pure_integer(enum pipe_format format)

{

   const struct util_format_description *desc = util_format_description(format);

   int i;

   /* Find the first non-void channel. */

   i = util_format_get_first_non_void_channel(format);

   if (i == -1)

      return FALSE;

   return desc->channel[i].pure_integer ? TRUE : FALSE;

}

boolean

util_format_is_pure_sint(enum pipe_format format)

{

   const struct util_format_description *desc = util_format_description(format);

   int i;

   i = util_format_get_first_non_void_channel(format);

   if (i == -1)

      return FALSE;

   return (desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;

}

boolean

util_format_is_pure_uint(enum pipe_format format)

{

   const struct util_format_description *desc = util_format_description(format);

   int i;

   i = util_format_get_first_non_void_channel(format);

   if (i == -1)

      return FALSE;

   return (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;

}

/**

 * Returns true if all non-void channels are normalized signed.

 */

boolean

util_format_is_snorm(enum pipe_format format)

{

   const struct util_format_description *desc = util_format_description(format);

   int i;

   if (desc->is_mixed)

      return FALSE;

   i = util_format_get_first_non_void_channel(format);

   if (i == -1)

      return FALSE;

   return desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED &&

          !desc->channel[i].pure_integer &&

          desc->channel[i].normalized;

}

boolean

util_format_is_luminance_alpha(enum pipe_format format)

{

   const struct util_format_description *desc =

      util_format_description(format);

   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||

        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&

       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_Y) {

      return TRUE;

   }

   return FALSE;

}

boolean

util_format_is_intensity(enum pipe_format format)

{

   const struct util_format_description *desc =

      util_format_description(format);

   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||

        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&

       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&

       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {

      return TRUE;

   }

   return FALSE;

}

boolean

util_format_is_subsampled_422(enum pipe_format format)

{

   const struct util_format_description *desc =

      util_format_description(format);

   return desc->layout == UTIL_FORMAT_LAYOUT_SUBSAMPLED &&

      desc->block.width == 2 &&

      desc->block.height == 1 &&

      desc->block.bits == 32;

}

boolean

util_format_is_supported(enum pipe_format format, unsigned bind)

{

   if (util_format_is_s3tc(format) && !util_format_s3tc_enabled) {

      return FALSE;

   }

#ifndef TEXTURE_FLOAT_ENABLED

   if ((bind & PIPE_BIND_RENDER_TARGET) &&

       format != PIPE_FORMAT_R9G9B9E5_FLOAT &&

       format != PIPE_FORMAT_R11G11B10_FLOAT &&

       util_format_is_float(format)) {

      return FALSE;

   }

#endif

   return TRUE;

}

/**

 * Calculates the MRD for the depth format. MRD is used in depth bias

 * for UNORM and unbound depth buffers. When the depth buffer is floating

 * point, the depth bias calculation does not use the MRD. However, the

 * default MRD will be 1.0 / ((1 << 24) - 1).

 */

double

util_get_depth_format_mrd(const struct util_format_description *desc)

{

   /*

    * Depth buffer formats without a depth component OR scenarios

    * without a bound depth buffer default to D24.

    */

   double mrd = 1.0 / ((1 << 24) - 1);

   unsigned depth_channel;

   assert(desc);

   /*

    * Some depth formats do not store the depth component in the first

    * channel, detect the format and adjust the depth channel. Get the

    * swizzled depth component channel.

    */

   depth_channel = desc->swizzle[0];

   if (desc->channel[depth_channel].type == UTIL_FORMAT_TYPE_UNSIGNED &&

       desc->channel[depth_channel].normalized) {

      int depth_bits;

      depth_bits = desc->channel[depth_channel].size;

      mrd = 1.0 / ((1ULL << depth_bits) - 1);

   }

   return mrd;

}

void

util_format_read_4f(enum pipe_format format,

                    float *dst, unsigned dst_stride,

                    const void *src, unsigned src_stride,

                    unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   const uint8_t *src_row;

   float *dst_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);

   dst_row = dst;

   format_desc->unpack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);

}

void

util_format_write_4f(enum pipe_format format,

                     const float *src, unsigned src_stride,

                     void *dst, unsigned dst_stride,

                     unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   uint8_t *dst_row;

   const float *src_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);

   src_row = src;

   format_desc->pack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);

}

void

util_format_read_4ub(enum pipe_format format, uint8_t *dst, unsigned dst_stride, const void *src, unsigned src_stride, unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   const uint8_t *src_row;

   uint8_t *dst_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);

   dst_row = dst;

   format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);

}

void

util_format_write_4ub(enum pipe_format format, const uint8_t *src, unsigned src_stride, void *dst, unsigned dst_stride, unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   uint8_t *dst_row;

   const uint8_t *src_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);

   src_row = src;

   format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);

}

void

util_format_read_4ui(enum pipe_format format,

                     unsigned *dst, unsigned dst_stride,

                     const void *src, unsigned src_stride,

                     unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   const uint8_t *src_row;

   uint32_t *dst_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);

   dst_row = dst;

   format_desc->unpack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);

}

void

util_format_write_4ui(enum pipe_format format,

                      const unsigned int *src, unsigned src_stride,

                      void *dst, unsigned dst_stride,

                      unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   uint8_t *dst_row;

   const uint32_t *src_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);

   src_row = src;

   format_desc->pack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);

}

void

util_format_read_4i(enum pipe_format format,

                    int *dst, unsigned dst_stride,

                    const void *src, unsigned src_stride,

                    unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   const uint8_t *src_row;

   int32_t *dst_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);

   dst_row = dst;

   format_desc->unpack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);

}

void

util_format_write_4i(enum pipe_format format,

                      const int *src, unsigned src_stride,

                      void *dst, unsigned dst_stride,

                      unsigned x, unsigned y, unsigned w, unsigned h)

{

   const struct util_format_description *format_desc;

   uint8_t *dst_row;

   const int32_t *src_row;

   format_desc = util_format_description(format);

   assert(x % format_desc->block.width == 0);

   assert(y % format_desc->block.height == 0);

   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);

   src_row = src;

   format_desc->pack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);

}

boolean

util_is_format_compatible(const struct util_format_description *src_desc,

                          const struct util_format_description *dst_desc)

{

   unsigned chan;

   if (src_desc->format == dst_desc->format) {

      return TRUE;

   }

   if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||

       dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {

      return FALSE;

   }

   if (src_desc->block.bits != dst_desc->block.bits ||

       src_desc->nr_channels != dst_desc->nr_channels ||

       src_desc->colorspace != dst_desc->colorspace) {

      return FALSE;

   }

   for (chan = 0; chan < 4; ++chan) {

      if (src_desc->channel[chan].size !=

          dst_desc->channel[chan].size) {

         return FALSE;

      }

   }

   for (chan = 0; chan < 4; ++chan) {

      enum util_format_swizzle swizzle = dst_desc->swizzle[chan];

      if (swizzle < 4) {

         if (src_desc->swizzle[chan] != swizzle) {

            return FALSE;

         }

         if ((src_desc->channel[swizzle].type !=

              dst_desc->channel[swizzle].type) ||

             (src_desc->channel[swizzle].normalized !=

              dst_desc->channel[swizzle].normalized)) {

            return FALSE;

         }

      }

   }

   return TRUE;

}

boolean

util_format_fits_8unorm(const struct util_format_description *format_desc)

{

   unsigned chan;

   /*

    * After linearized sRGB values require more than 8bits.

    */

   if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {

      return FALSE;

   }

   switch (format_desc->layout) {

   case UTIL_FORMAT_LAYOUT_S3TC:

      /*

       * These are straight forward.

       */

      return TRUE;

   case UTIL_FORMAT_LAYOUT_RGTC:

      if (format_desc->format == PIPE_FORMAT_RGTC1_SNORM ||

          format_desc->format == PIPE_FORMAT_RGTC2_SNORM ||

          format_desc->format == PIPE_FORMAT_LATC1_SNORM ||

          format_desc->format == PIPE_FORMAT_LATC2_SNORM)

         return FALSE;

      return TRUE;

   case UTIL_FORMAT_LAYOUT_BPTC:

      if (format_desc->format == PIPE_FORMAT_BPTC_RGBA_UNORM)

         return TRUE;

      return FALSE;

   case UTIL_FORMAT_LAYOUT_PLAIN:

      /*

       * For these we can find a generic rule.

       */

      for (chan = 0; chan < format_desc->nr_channels; ++chan) {

         switch (format_desc->channel[chan].type) {

         case UTIL_FORMAT_TYPE_VOID:

            break;

         case UTIL_FORMAT_TYPE_UNSIGNED:

            if (!format_desc->channel[chan].normalized ||

                format_desc->channel[chan].size > 8) {

               return FALSE;

            }

            break;

         default:

            return FALSE;

         }

      }

      return TRUE;

   default:

      /*

       * Handle all others on a case by case basis.

       */

      switch (format_desc->format) {

      case PIPE_FORMAT_R1_UNORM:

      case PIPE_FORMAT_UYVY:

      case PIPE_FORMAT_YUYV:

      case PIPE_FORMAT_R8G8_B8G8_UNORM:

      case PIPE_FORMAT_G8R8_G8B8_UNORM:

         return TRUE;

      default:

         return FALSE;

      }

   }

}

boolean

util_format_translate(enum pipe_format dst_format,

                      void *dst, unsigned dst_stride,

                      unsigned dst_x, unsigned dst_y,

                      enum pipe_format src_format,

                      const void *src, unsigned src_stride,

                      unsigned src_x, unsigned src_y,

                      unsigned width, unsigned height)

{

   const struct util_format_description *dst_format_desc;

   const struct util_format_description *src_format_desc;

   uint8_t *dst_row;

   const uint8_t *src_row;

   unsigned x_step, y_step;

   unsigned dst_step;

   unsigned src_step;

   dst_format_desc = util_format_description(dst_format);

   src_format_desc = util_format_description(src_format);

   if (util_is_format_compatible(src_format_desc, dst_format_desc)) {

      /*

       * Trivial case.

       */

      util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,

                     width, height, src, (int)src_stride,

                     src_x, src_y);

      return TRUE;

   }

   assert(dst_x % dst_format_desc->block.width == 0);

   assert(dst_y % dst_format_desc->block.height == 0);

   assert(src_x % src_format_desc->block.width == 0);

   assert(src_y % src_format_desc->block.height == 0);

   dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);

   src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);

   /*

    * This works because all pixel formats have pixel blocks with power of two

    * sizes.

    */

   y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);

   x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);

   assert(y_step % dst_format_desc->block.height == 0);

   assert(y_step % src_format_desc->block.height == 0);

   dst_step = y_step / dst_format_desc->block.height * dst_stride;

   src_step = y_step / src_format_desc->block.height * src_stride;

   /*

    * TODO: double formats will loose precision

    * TODO: Add a special case for formats that are mere swizzles of each other

    */

   if (src_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ||

       dst_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {

      float *tmp_z = NULL;

      uint8_t *tmp_s = NULL;

      assert(x_step == 1);

      assert(y_step == 1);

      if (src_format_desc->unpack_z_float &&

          dst_format_desc->pack_z_float) {

         tmp_z = MALLOC(width * sizeof *tmp_z);

      }

      if (src_format_desc->unpack_s_8uint &&

          dst_format_desc->pack_s_8uint) {

         tmp_s = MALLOC(width * sizeof *tmp_s);

      }

      while (height--) {

         if (tmp_z) {

            src_format_desc->unpack_z_float(tmp_z, 0, src_row, src_stride, width, 1);

            dst_format_desc->pack_z_float(dst_row, dst_stride, tmp_z, 0, width, 1);

         }

         if (tmp_s) {

            src_format_desc->unpack_s_8uint(tmp_s, 0, src_row, src_stride, width, 1);

            dst_format_desc->pack_s_8uint(dst_row, dst_stride, tmp_s, 0, width, 1);

         }

         dst_row += dst_step;

         src_row += src_step;

      }

      FREE(tmp_s);

      FREE(tmp_z);

      return TRUE;

   }

   if (util_format_fits_8unorm(src_format_desc) ||

       util_format_fits_8unorm(dst_format_desc)) {

      unsigned tmp_stride;

      uint8_t *tmp_row;

      if (!src_format_desc->unpack_rgba_8unorm ||

          !dst_format_desc->pack_rgba_8unorm) {

         return FALSE;

      }

      tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;

      tmp_row = MALLOC(y_step * tmp_stride);

      if (!tmp_row)

         return FALSE;

      while (height >= y_step) {

         src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);

         dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);

         dst_row += dst_step;

         src_row += src_step;

         height -= y_step;

      }

      if (height) {

         src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);

         dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);

      }

      FREE(tmp_row);

   }

   else {

      unsigned tmp_stride;

      float *tmp_row;

      if (!src_format_desc->unpack_rgba_float ||

          !dst_format_desc->pack_rgba_float) {

         return FALSE;

      }

      tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;

      tmp_row = MALLOC(y_step * tmp_stride);

      if (!tmp_row)

         return FALSE;

      while (height >= y_step) {

         src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);

         dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);

         dst_row += dst_step;

         src_row += src_step;

         height -= y_step;

      }

      if (height) {

         src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);

         dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);

      }

      FREE(tmp_row);

   }

   return TRUE;

}

void util_format_compose_swizzles(const unsigned char swz1[4],

                                  const unsigned char swz2[4],

                                  unsigned char dst[4])

{

   unsigned i;

   for (i = 0; i < 4; i++) {

      dst[i] = swz2[i] <= UTIL_FORMAT_SWIZZLE_W ?

               swz1[swz2[i]] : swz2[i];

   }

}

void util_format_apply_color_swizzle(union pipe_color_union *dst,

                                     const union pipe_color_union *src,

                                     const unsigned char swz[4],

                                     const boolean is_integer)

{

   unsigned c;

   if (is_integer) {

      for (c = 0; c < 4; ++c) {

         switch (swz[c]) {

         case PIPE_SWIZZLE_RED:   dst->ui[c] = src->ui[0]; break;

         case PIPE_SWIZZLE_GREEN: dst->ui[c] = src->ui[1]; break;

         case PIPE_SWIZZLE_BLUE:  dst->ui[c] = src->ui[2]; break;

         case PIPE_SWIZZLE_ALPHA: dst->ui[c] = src->ui[3]; break;

         default:

            dst->ui[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1 : 0;

            break;

         }

      }

   } else {

      for (c = 0; c < 4; ++c) {

         switch (swz[c]) {

         case PIPE_SWIZZLE_RED:   dst->f[c] = src->f[0]; break;

         case PIPE_SWIZZLE_GREEN: dst->f[c] = src->f[1]; break;

         case PIPE_SWIZZLE_BLUE:  dst->f[c] = src->f[2]; break;

         case PIPE_SWIZZLE_ALPHA: dst->f[c] = src->f[3]; break;

         default:

            dst->f[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1.0f : 0.0f;

            break;

         }

      }

   }

}

void util_format_swizzle_4f(float *dst, const float *src,

                            const unsigned char swz[4])

{

   unsigned i;

   for (i = 0; i < 4; i++) {

      if (swz[i] <= UTIL_FORMAT_SWIZZLE_W)

         dst[i] = src[swz[i]];

      else if (swz[i] == UTIL_FORMAT_SWIZZLE_0)

         dst[i] = 0;

      else if (swz[i] == UTIL_FORMAT_SWIZZLE_1)

         dst[i] = 1;

   }

}

void util_format_unswizzle_4f(float *dst, const float *src,

                              const unsigned char swz[4])

{

   unsigned i;

   for (i = 0; i < 4; i++) {

      switch (swz[i]) {

      case UTIL_FORMAT_SWIZZLE_X:

         dst[0] = src[i];

         break;

      case UTIL_FORMAT_SWIZZLE_Y:

         dst[1] = src[i];

         break;

      case UTIL_FORMAT_SWIZZLE_Z:

         dst[2] = src[i];

         break;

      case UTIL_FORMAT_SWIZZLE_W:

         dst[3] = src[i];

         break;

      }

   }

}