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+
+-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs is free software; you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License as published by the
+-- Free Software Foundation; either version 2 of the License, or (at
+-- your option) any later version.
+
+-- VESTs is distributed in the hope that it will be useful, but WITHOUT
+-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+-- for more details.
+
+-- You should have received a copy of the GNU General Public License
+-- along with VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+-- not in book
+
+entity graphics_engine is
+end entity graphics_engine;
+
+-- end not in book
+
+
+architecture behavioral of graphics_engine is
+
+ type point is array (1 to 3) of real;
+ type transformation_matrix is array (1 to 3, 1 to 3) of real;
+
+ signal p, transformed_p : point;
+ signal a : transformation_matrix;
+ signal clock : bit;
+ -- . . .
+
+begin
+
+ transform_stage : for i in 1 to 3 generate
+ begin
+
+ cross_product_transform : process is
+ variable result1, result2, result3 : real := 0.0;
+ begin
+ wait until clock = '1';
+ transformed_p(i) <= result3;
+ result3 := result2;
+ result2 := result1;
+ result1 := a(i, 1) * p(1) + a(i, 2) * p(2) + a(i, 3) * p(3);
+ end process cross_product_transform;
+
+ end generate transform_stage;
+
+ -- . . . -- other stages in the pipeline, etc
+
+ -- not in book
+
+ clock_gen : clock <= '1' after 10 ns, '0' after 20 ns when clock = '0';
+
+ stimulus : process is
+ begin
+ a <= ( (1.0, 0.0, 0.0), (0.0, 1.0, 0.0), (0.0, 0.0, 1.0) );
+ p <= ( 10.0, 10.0, 10.0 );
+ wait until clock = '0';
+ p <= ( 20.0, 20.0, 20.0 );
+ wait until clock = '0';
+ p <= ( 30.0, 30.0, 30.0 );
+ wait until clock = '0';
+ p <= ( 40.0, 40.0, 40.0 );
+ wait until clock = '0';
+ p <= ( 50.0, 50.0, 50.0 );
+ wait until clock = '0';
+ p <= ( 60.0, 60.0, 60.0 );
+
+ wait;
+ end process stimulus;
+
+ -- end not in book
+
+end architecture behavioral;