src/gallium/drivers/llvmpipe/lp_tile_soa.py

   1 #!/usr/bin/env python
   2
   3 '''
   4 /**************************************************************************
   5  *
   6  * Copyright 2009 VMware, Inc.
   7  * All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sub license, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice (including the
  18  * next paragraph) shall be included in all copies or substantial portions
  19  * of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  24  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  25  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  26  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  27  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28  *
  29  **************************************************************************/
  30
  31 /**
  32  * @file
  33  * Pixel format accessor functions.
  34  *
  35  * @author Jose Fonseca <jfonseca@vmware.com>
  36  */
  37 '''
  38
  39
  40 import sys
  41 import os.path
  42
  43 sys.path.insert(0, os.path.join(os.path.dirname(sys.argv[0]), '../../auxiliary/util'))
  44
  45 from u_format_access import *
  46
  47
  48 def generate_format_read(format, dst_type, dst_native_type, dst_suffix):
  49     '''Generate the function to read pixels from a particular format'''
  50
  51     name = short_name(format)
  52
  53     src_native_type = native_type(format)
  54
  55     print 'static void'
  56     print 'lp_tile_%s_read_%s(%s *dst, const uint8_t *src, unsigned src_stride, unsigned x0, unsigned y0, unsigned w, unsigned h)' % (name, dst_suffix, dst_native_type)
  57     print '{'
  58     print '   unsigned x, y;'
  59     print '   const uint8_t *src_row = src + y0*src_stride;'
  60     print '   for (y = 0; y < h; ++y) {'
  61     print '      const %s *src_pixel = (const %s *)(src_row + x0*%u);' % (src_native_type, src_native_type, format.stride())
  62     print '      for (x = 0; x < w; ++x) {'
  63
  64     names = ['']*4
  65     if format.colorspace == 'rgb':
  66         for i in range(4):
  67             swizzle = format.out_swizzle[i]
  68             if swizzle < 4:
  69                 names[swizzle] += 'rgba'[i]
  70     elif format.colorspace == 'zs':
  71         swizzle = format.out_swizzle[0]
  72         if swizzle < 4:
  73             names[swizzle] = 'z'
  74         else:
  75             assert False
  76     else:
  77         assert False
  78
  79     if format.layout == ARITH:
  80         print '         %s pixel = *src_pixel++;' % src_native_type
  81         shift = 0;
  82         for i in range(4):
  83             src_type = format.in_types[i]
  84             width = src_type.size
  85             if names[i]:
  86                 value = 'pixel'
  87                 mask = (1 << width) - 1
  88                 if shift:
  89                     value = '(%s >> %u)' % (value, shift)
  90                 if shift + width < format.block_size():
  91                     value = '(%s & 0x%x)' % (value, mask)
  92                 value = conversion_expr(src_type, dst_type, dst_native_type, value)
  93                 print '         %s %s = %s;' % (dst_native_type, names[i], value)
  94             shift += width
  95     elif format.layout == ARRAY:
  96         for i in range(4):
  97             src_type = format.in_types[i]
  98             if names[i]:
  99                 value = '(*src_pixel++)'
 100                 value = conversion_expr(src_type, dst_type, dst_native_type, value)
 101                 print '         %s %s = %s;' % (dst_native_type, names[i], value)
 102     else:
 103         assert False
 104
 105     for i in range(4):
 106         if format.colorspace == 'rgb':
 107             swizzle = format.out_swizzle[i]
 108             if swizzle < 4:
 109                 value = names[swizzle]
 110             elif swizzle == SWIZZLE_0:
 111                 value = '0'
 112             elif swizzle == SWIZZLE_1:
 113                 value = '1'
 114             else:
 115                 assert False
 116         elif format.colorspace == 'zs':
 117             if i < 3:
 118                 value = 'z'
 119             else:
 120                 value = '1'
 121         else:
 122             assert False
 123         print '         TILE_PIXEL(dst, x, y, %u) = %s; /* %s */' % (i, value, 'rgba'[i])
 124
 125     print '      }'
 126     print '      src_row += src_stride;'
 127     print '   }'
 128     print '}'
 129     print
 130
 131
 132 def compute_inverse_swizzle(format):
 133     '''Return an array[4] of inverse swizzle terms'''
 134     inv_swizzle = [None]*4
 135     if format.colorspace == 'rgb':
 136         for i in range(4):
 137             swizzle = format.out_swizzle[i]
 138             if swizzle < 4:
 139                 inv_swizzle[swizzle] = i
 140     elif format.colorspace == 'zs':
 141         swizzle = format.out_swizzle[0]
 142         if swizzle < 4:
 143             inv_swizzle[swizzle] = 0
 144     return inv_swizzle
 145
 146
 147 def pack_rgba(format, src_type, r, g, b, a):
 148     """Return an expression for packing r, g, b, a into a pixel of the
 149     given format.  Ex: '(b << 24) | (g << 16) | (r << 8) | (a << 0)'
 150     """
 151     assert format.colorspace == 'rgb'
 152     inv_swizzle = compute_inverse_swizzle(format)
 153     shift = 0
 154     expr = None
 155     for i in range(4):
 156                 # choose r, g, b, or a depending on the inverse swizzle term
 157         if inv_swizzle[i] == 0:
 158             value = r
 159         elif inv_swizzle[i] == 1:
 160             value = g
 161         elif inv_swizzle[i] == 2:
 162             value = b
 163         elif inv_swizzle[i] == 3:
 164             value = a
 165         else:
 166             value = None
 167
 168         if value:
 169             dst_type = format.in_types[i]
 170             dst_native_type = native_type(format)
 171             value = conversion_expr(src_type, dst_type, dst_native_type, value)
 172             term = "((%s) << %d)" % (value, shift)
 173             if expr:
 174                 expr = expr + " | " + term
 175             else:
 176                 expr = term
 177
 178         width = format.in_types[i].size
 179         shift = shift + width
 180     return expr
 181
 182
 183 def emit_unrolled_write_code(format, src_type):
 184     '''Emit code for writing a block based on unrolled loops.
 185     This is considerably faster than the TILE_PIXEL-based code below.
 186     '''
 187     dst_native_type = native_type(format)
 188     print '   const unsigned dstpix_stride = dst_stride / %d;' % format.stride()
 189     print '   %s *dstpix = (%s *) dst;' % (dst_native_type, dst_native_type)
 190     print '   unsigned int qx, qy, i;'
 191     print
 192     print '   for (qy = 0; qy < h; qy += TILE_VECTOR_HEIGHT) {'
 193     print '      const unsigned py = y0 + qy;'
 194     print '      for (qx = 0; qx < w; qx += TILE_VECTOR_WIDTH) {'
 195     print '         const unsigned px = x0 + qx;'
 196     print '         const uint8_t *r = src + 0 * TILE_C_STRIDE;'
 197     print '         const uint8_t *g = src + 1 * TILE_C_STRIDE;'
 198     print '         const uint8_t *b = src + 2 * TILE_C_STRIDE;'
 199     print '         const uint8_t *a = src + 3 * TILE_C_STRIDE;'
 200     print '         (void) r; (void) g; (void) b; (void) a; /* silence warnings */'
 201     print '         for (i = 0; i < TILE_C_STRIDE; i += 2) {'
 202     print '            const uint32_t pixel0 = %s;' % pack_rgba(format, src_type, "r[i+0]", "g[i+0]", "b[i+0]", "a[i+0]")
 203     print '            const uint32_t pixel1 = %s;' % pack_rgba(format, src_type, "r[i+1]", "g[i+1]", "b[i+1]", "a[i+1]")
 204     print '            const unsigned offset = (py + tile_y_offset[i]) * dstpix_stride + (px + tile_x_offset[i]);'
 205     print '            dstpix[offset + 0] = pixel0;'
 206     print '            dstpix[offset + 1] = pixel1;'
 207     print '         }'
 208     print '         src += TILE_X_STRIDE;'
 209     print '      }'
 210     print '   }'
 211
 212
 213 def emit_tile_pixel_write_code(format, src_type):
 214     '''Emit code for writing a block based on the TILE_PIXEL macro.'''
 215     dst_native_type = native_type(format)
 216
 217     inv_swizzle = compute_inverse_swizzle(format)
 218
 219     print '   unsigned x, y;'
 220     print '   uint8_t *dst_row = dst + y0*dst_stride;'
 221     print '   for (y = 0; y < h; ++y) {'
 222     print '      %s *dst_pixel = (%s *)(dst_row + x0*%u);' % (dst_native_type, dst_native_type, format.stride())
 223     print '      for (x = 0; x < w; ++x) {'
 224
 225     if format.layout == ARITH:
 226         print '         %s pixel = 0;' % dst_native_type
 227         shift = 0;
 228         for i in range(4):
 229             dst_type = format.in_types[i]
 230             width = dst_type.size
 231             if inv_swizzle[i] is not None:
 232                 value = 'TILE_PIXEL(src, x, y, %u)' % inv_swizzle[i]
 233                 value = conversion_expr(src_type, dst_type, dst_native_type, value)
 234                 if shift:
 235                     value = '(%s << %u)' % (value, shift)
 236                 print '         pixel |= %s;' % value
 237             shift += width
 238         print '         *dst_pixel++ = pixel;'
 239     elif format.layout == ARRAY:
 240         for i in range(4):
 241             dst_type = format.in_types[i]
 242             if inv_swizzle[i] is not None:
 243                 value = 'TILE_PIXEL(src, x, y, %u)' % inv_swizzle[i]
 244                 value = conversion_expr(src_type, dst_type, dst_native_type, value)
 245                 print '         *dst_pixel++ = %s;' % value
 246     else:
 247         assert False
 248
 249     print '      }'
 250     print '      dst_row += dst_stride;'
 251     print '   }'
 252
 253
 254 def generate_format_write(format, src_type, src_native_type, src_suffix):
 255     '''Generate the function to write pixels to a particular format'''
 256
 257     name = short_name(format)
 258
 259     print 'static void'
 260     print 'lp_tile_%s_write_%s(const %s *src, uint8_t *dst, unsigned dst_stride, unsigned x0, unsigned y0, unsigned w, unsigned h)' % (name, src_suffix, src_native_type)
 261     print '{'
 262     if format.layout == ARITH and format.colorspace == 'rgb':
 263         emit_unrolled_write_code(format, src_type)
 264     else:
 265         emit_tile_pixel_write_code(format, src_type)
 266     print '}'
 267     print
 268
 269
 270 def generate_read(formats, dst_type, dst_native_type, dst_suffix):
 271     '''Generate the dispatch function to read pixels from any format'''
 272
 273     for format in formats:
 274         if is_format_supported(format):
 275             generate_format_read(format, dst_type, dst_native_type, dst_suffix)
 276
 277     print 'void'
 278     print 'lp_tile_read_%s(enum pipe_format format, %s *dst, const void *src, unsigned src_stride, unsigned x, unsigned y, unsigned w, unsigned h)' % (dst_suffix, dst_native_type)
 279     print '{'
 280     print '   void (*func)(%s *dst, const uint8_t *src, unsigned src_stride, unsigned x0, unsigned y0, unsigned w, unsigned h);' % dst_native_type
 281     print '   switch(format) {'
 282     for format in formats:
 283         if is_format_supported(format):
 284             print '   case %s:' % format.name
 285             print '      func = &lp_tile_%s_read_%s;' % (short_name(format), dst_suffix)
 286             print '      break;'
 287     print '   default:'
 288     print '      debug_printf("unsupported format\\n");'
 289     print '      return;'
 290     print '   }'
 291     print '   func(dst, (const uint8_t *)src, src_stride, x, y, w, h);'
 292     print '}'
 293     print
 294
 295
 296 def generate_write(formats, src_type, src_native_type, src_suffix):
 297     '''Generate the dispatch function to write pixels to any format'''
 298
 299     for format in formats:
 300         if is_format_supported(format):
 301             generate_format_write(format, src_type, src_native_type, src_suffix)
 302
 303     print 'void'
 304     print 'lp_tile_write_%s(enum pipe_format format, const %s *src, void *dst, unsigned dst_stride, unsigned x, unsigned y, unsigned w, unsigned h)' % (src_suffix, src_native_type)
 305
 306     print '{'
 307     print '   void (*func)(const %s *src, uint8_t *dst, unsigned dst_stride, unsigned x0, unsigned y0, unsigned w, unsigned h);' % src_native_type
 308     print '   switch(format) {'
 309     for format in formats:
 310         if is_format_supported(format):
 311             print '   case %s:' % format.name
 312             print '      func = &lp_tile_%s_write_%s;' % (short_name(format), src_suffix)
 313             print '      break;'
 314     print '   default:'
 315     print '      debug_printf("unsupported format\\n");'
 316     print '      return;'
 317     print '   }'
 318     print '   func(src, (uint8_t *)dst, dst_stride, x, y, w, h);'
 319     print '}'
 320     print
 321
 322
 323 def main():
 324     formats = []
 325     for arg in sys.argv[1:]:
 326         formats.extend(parse(arg))
 327
 328     print '/* This file is autogenerated by lp_tile_soa.py from u_format.csv. Do not edit directly. */'
 329     print
 330     # This will print the copyright message on the top of this file
 331     print __doc__.strip()
 332     print
 333     print '#include "pipe/p_compiler.h"'
 334     print '#include "util/u_format.h"'
 335     print '#include "util/u_math.h"'
 336     print '#include "lp_tile_soa.h"'
 337     print
 338     print 'const unsigned char'
 339     print 'tile_offset[TILE_VECTOR_HEIGHT][TILE_VECTOR_WIDTH] = {'
 340     print '   {  0,  1,  4,  5},'
 341     print '   {  2,  3,  6,  7},'
 342     print '   {  8,  9, 12, 13},'
 343     print '   { 10, 11, 14, 15}'
 344     print '};'
 345     print
 346     print '/* Note: these lookup tables could be replaced with some'
 347     print ' * bit-twiddling code, but this is a little faster.'
 348     print ' */'
 349     print 'static unsigned tile_x_offset[TILE_VECTOR_WIDTH * TILE_VECTOR_HEIGHT] = {'
 350     print '   0, 1, 0, 1, 2, 3, 2, 3,'
 351     print '   0, 1, 0, 1, 2, 3, 2, 3'
 352     print '};'
 353     print
 354     print 'static unsigned tile_y_offset[TILE_VECTOR_WIDTH * TILE_VECTOR_HEIGHT] = {'
 355     print '   0, 0, 1, 1, 0, 0, 1, 1,'
 356     print '   2, 2, 3, 3, 2, 2, 3, 3'
 357     print '};'
 358     print
 359
 360     generate_clamp()
 361
 362     type = Type(UNSIGNED, True, 8)
 363     native_type = 'uint8_t'
 364     suffix = '4ub'
 365
 366     generate_read(formats, type, native_type, suffix)
 367     generate_write(formats, type, native_type, suffix)
 368
 369
 370 if __name__ == '__main__':
 371     main()