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  1. /*
  2.  * Copyright © 2006 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Keith Packard <keithp@keithp.com>
  25.  *    Eric Anholt <eric@anholt.net>
  26.  *
  27.  */
  28.  
  29. /*
  30.  * Inputs (note all sub-register addresses are bytes, not float indices)
  31.  *
  32.  * Note that the vertices will have been reordered:
  33.  *
  34.  * V0 is topmost (leftmost among topmost) (upper left)
  35.  * V1 is next clockwise (lower right)
  36.  * V2 is remaining (lower left)
  37.  *
  38.  *  V0 ...................... XX
  39.  *  |                          .
  40.  *  |                          .
  41.  *  |                          .
  42.  *  V2------------------------V1
  43.  *
  44.  *  G0      thread state -- just pass along
  45.  *
  46.  *  G1 and G2 are fixed by SF spec
  47.  *
  48.  *  G1.0    reserved
  49.  *  G1.4    Provoking vertex
  50.  *  G1.8    Determinant
  51.  *  G1.12   X1 - X0
  52.  *  G1.16   X2 - X0
  53.  *  G1.20   Y1 - Y0
  54.  *  G1.24   Y2 - Y0
  55.  *  G1.30   reserved
  56.  *
  57.  *  G2.0    Z0
  58.  *  G2.4    1/W0
  59.  *  G2.8    Z1
  60.  *  G2.12   1/W1
  61.  *  G2.16   Z2
  62.  *  G2.20   1/W2
  63.  *  G2.24   reserved
  64.  *  G2.30   reserved
  65.  *
  66.  *  G3 is V0 Vertex Attribute Data from URB (upper left)
  67.  *
  68.  *  G3.0    u0
  69.  *  G3.4    v0
  70.  *
  71.  *  G4 is V1 Vertex Attribute Data from URB (lower right)
  72.  *
  73.  *  G4.0    u1
  74.  *  G4.4    v1
  75.  *
  76.  *  G5 is V2 Vertex Attribute Data from URB (lower left)
  77.  *
  78.  */
  79.  
  80. /* Compute inverses of the input deltas */
  81. send (4) 0 g6<1>F g1.12<4,4,1>F math inv mlen 1 rlen 1 { align1 };
  82.  
  83. /* texture location at V0 */
  84. mov (4) m3<1>F g3<4,4,1>F { align1 };
  85.  
  86. /* compute V1 - V2 (motion in X) for texture coordinates */
  87. add (4) g7<1>F g4<4,4,1>F -g5<4,4,1>F { align1 };
  88.  
  89. /* multiply by 1/dx */
  90. mul (4) m1<1>F g7<4,4,1>F g6.0<0,1,0>F { align1 };
  91.  
  92. /* Compute V2 - V0 (motion in Y) for texture coordinates */
  93. add (4) g7<1>F g5<4,4,1>F -g3<4,4,1>F { align1 };
  94.  
  95. /* multiply by 1/dy */
  96. mul (4) m2<1>F g7<4,4,1>F g6.8<0,1,0>F {align1 };
  97.  
  98. /* and we're done */
  99. send (8) 0 null g0<8,8,1>F urb 0 transpose used complete mlen 4 rlen 0 { align1 EOT };
  100. nop;
  101. nop;
  102. nop;
  103. nop;
  104. nop;
  105. nop;
  106. nop;
  107. nop;
  108.