src/gallium/drivers/cell/spu/spu_funcs.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
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  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  27
  28
  29 /**
  30  * SPU functions accessed by shaders.
  31  *
  32  * Authors: Brian Paul
  33  */
  34
  35
  36 #include <string.h>
  37 #include <libmisc.h>
  38 #include <cos8_v.h>
  39 #include <sin8_v.h>
  40
  41 #include "cell/common.h"
  42 #include "spu_main.h"
  43 #include "spu_funcs.h"
  44
  45
  46 #define M_PI 3.1415926
  47
  48
  49 static vector float
  50 spu_cos(vector float x)
  51 {
  52 #if 0
  53    static const float scale = 1.0 / (2.0 * M_PI);
  54    x = x * spu_splats(scale); /* normalize */
  55    return _cos8_v(x);
  56 #else
  57    /* just pass-through to avoid trashing caller's stack */
  58    return x;
  59 #endif
  60 }
  61
  62 static vector float
  63 spu_sin(vector float x)
  64 {
  65 #if 0
  66    static const float scale = 1.0 / (2.0 * M_PI);
  67    x = x * spu_splats(scale); /* normalize */
  68    return _sin8_v(x);   /* 8-bit accuracy enough?? */
  69 #else
  70    /* just pass-through to avoid trashing caller's stack */
  71    return x;
  72 #endif
  73 }
  74
  75
  76 static void
  77 add_func(struct cell_spu_function_info *spu_functions,
  78              const char *name, void *addr)
  79 {
  80    uint n = spu_functions->num;
  81    ASSERT(strlen(name) < 16);
  82    strcpy(spu_functions->names[n], name);
  83    spu_functions->addrs[n] = (uint) addr;
  84    spu_functions->num++;
  85 }
  86
  87
  88 /**
  89  * Return info about the SPU's function to the PPU / main memory.
  90  * The PPU needs to know the address of some SPU-side functions so
  91  * that we can generate shader code with function calls.
  92  */
  93 void
  94 return_function_info(void)
  95 {
  96    struct cell_spu_function_info funcs ALIGN16_ATTRIB;
  97    int tag = TAG_MISC;
  98
  99    ASSERT(sizeof(funcs) == 256); /* must be multiple of 16 bytes */
 100
 101    funcs.num = 0;
 102    add_func(&funcs, "spu_cos", &spu_cos);
 103    add_func(&funcs, "spu_sin", &spu_sin);
 104
 105    /* Send the function info back to the PPU / main memory */
 106    mfc_put((void *) &funcs,  /* src in local store */
 107            (unsigned int) spu.init.spu_functions, /* dst in main memory */
 108            sizeof(funcs),  /* bytes */
 109            tag,
 110            0, /* tid */
 111            0  /* rid */);
 112    wait_on_mask(1 << tag);
 113 }
 114
 115
 116