mesa: rename src/mesa/shader/ to src/mesa/program/

1 files changed, 0 insertions, 638 deletions

diff --git a/src/mesa/shader/prog_noise.c b/src/mesa/shader/prog_noise.c
deleted file mode 100644
index 1713ddb5f34..00000000000
--- a/src/mesa/shader/prog_noise.c
+++ /dev/null
@@ -1,638 +0,0 @@
-/*
- * Mesa 3-D graphics library
- * Version:  6.5
- *
- * Copyright (C) 2006  Brian Paul   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, sublicense,
- * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL 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.
- */
-
-/*
- * SimplexNoise1234
- * Copyright (c) 2003-2005, Stefan Gustavson
- *
- * Contact: [email protected]
- */
-
-/**
- * \file
- * \brief C implementation of Perlin Simplex Noise over 1, 2, 3 and 4 dims.
- * \author Stefan Gustavson ([email protected])
- *
- *
- * This implementation is "Simplex Noise" as presented by
- * Ken Perlin at a relatively obscure and not often cited course
- * session "Real-Time Shading" at Siggraph 2001 (before real
- * time shading actually took on), under the title "hardware noise".
- * The 3D function is numerically equivalent to his Java reference
- * code available in the PDF course notes, although I re-implemented
- * it from scratch to get more readable code. The 1D, 2D and 4D cases
- * were implemented from scratch by me from Ken Perlin's text.
- *
- * This file has no dependencies on any other file, not even its own
- * header file. The header file is made for use by external code only.
- */
-
-
-#include "main/imports.h"
-#include "prog_noise.h"
-
-#define FASTFLOOR(x) ( ((x)>0) ? ((int)x) : (((int)x)-1) )
-
-/*
- * ---------------------------------------------------------------------
- * Static data
- */
-
-/**
- * Permutation table. This is just a random jumble of all numbers 0-255,
- * repeated twice to avoid wrapping the index at 255 for each lookup.
- * This needs to be exactly the same for all instances on all platforms,
- * so it's easiest to just keep it as static explicit data.
- * This also removes the need for any initialisation of this class.
- *
- * Note that making this an int[] instead of a char[] might make the
- * code run faster on platforms with a high penalty for unaligned single
- * byte addressing. Intel x86 is generally single-byte-friendly, but
- * some other CPUs are faster with 4-aligned reads.
- * However, a char[] is smaller, which avoids cache trashing, and that
- * is probably the most important aspect on most architectures.
- * This array is accessed a *lot* by the noise functions.
- * A vector-valued noise over 3D accesses it 96 times, and a
- * float-valued 4D noise 64 times. We want this to fit in the cache!
- */
-unsigned char perm[512] = { 151, 160, 137, 91, 90, 15,
-   131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142, 8,
-      99, 37, 240, 21, 10, 23,
-   190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35,
-      11, 32, 57, 177, 33,
-   88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71,
-      134, 139, 48, 27, 166,
-   77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41,
-      55, 46, 245, 40, 244,
-   102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89,
-      18, 169, 200, 196,
-   135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217,
-      226, 250, 124, 123,
-   5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58,
-      17, 182, 189, 28, 42,
-   223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155,
-      167, 43, 172, 9,
-   129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104,
-      218, 246, 97, 228,
-   251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235,
-      249, 14, 239, 107,
-   49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45,
-      127, 4, 150, 254,
-   138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66,
-      215, 61, 156, 180,
-   151, 160, 137, 91, 90, 15,
-   131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142, 8,
-      99, 37, 240, 21, 10, 23,
-   190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35,
-      11, 32, 57, 177, 33,
-   88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71,
-      134, 139, 48, 27, 166,
-   77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41,
-      55, 46, 245, 40, 244,
-   102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89,
-      18, 169, 200, 196,
-   135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217,
-      226, 250, 124, 123,
-   5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58,
-      17, 182, 189, 28, 42,
-   223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155,
-      167, 43, 172, 9,
-   129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104,
-      218, 246, 97, 228,
-   251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235,
-      249, 14, 239, 107,
-   49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45,
-      127, 4, 150, 254,
-   138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66,
-      215, 61, 156, 180
-};
-
-/*
- * ---------------------------------------------------------------------
- */
-
-/*
- * Helper functions to compute gradients-dot-residualvectors (1D to 4D)
- * Note that these generate gradients of more than unit length. To make
- * a close match with the value range of classic Perlin noise, the final
- * noise values need to be rescaled to fit nicely within [-1,1].
- * (The simplex noise functions as such also have different scaling.)
- * Note also that these noise functions are the most practical and useful
- * signed version of Perlin noise. To return values according to the
- * RenderMan specification from the SL noise() and pnoise() functions,
- * the noise values need to be scaled and offset to [0,1], like this:
- * float SLnoise = (SimplexNoise1234::noise(x,y,z) + 1.0) * 0.5;
- */
-
-static float
-grad1(int hash, float x)
-{
-   int h = hash & 15;
-   float grad = 1.0f + (h & 7); /* Gradient value 1.0, 2.0, ..., 8.0 */
-   if (h & 8)
-      grad = -grad;             /* Set a random sign for the gradient */
-   return (grad * x);           /* Multiply the gradient with the distance */
-}
-
-static float
-grad2(int hash, float x, float y)
-{
-   int h = hash & 7;            /* Convert low 3 bits of hash code */
-   float u = h < 4 ? x : y;     /* into 8 simple gradient directions, */
-   float v = h < 4 ? y : x;     /* and compute the dot product with (x,y). */
-   return ((h & 1) ? -u : u) + ((h & 2) ? -2.0f * v : 2.0f * v);
-}
-
-static float
-grad3(int hash, float x, float y, float z)
-{
-   int h = hash & 15;           /* Convert low 4 bits of hash code into 12 simple */
-   float u = h < 8 ? x : y;     /* gradient directions, and compute dot product. */
-   float v = h < 4 ? y : h == 12 || h == 14 ? x : z;    /* Fix repeats at h = 12 to 15 */
-   return ((h & 1) ? -u : u) + ((h & 2) ? -v : v);
-}
-
-static float
-grad4(int hash, float x, float y, float z, float t)
-{
-   int h = hash & 31;           /* Convert low 5 bits of hash code into 32 simple */
-   float u = h < 24 ? x : y;    /* gradient directions, and compute dot product. */
-   float v = h < 16 ? y : z;
-   float w = h < 8 ? z : t;
-   return ((h & 1) ? -u : u) + ((h & 2) ? -v : v) + ((h & 4) ? -w : w);
-}
-
-/**
- * A lookup table to traverse the simplex around a given point in 4D.
- * Details can be found where this table is used, in the 4D noise method.
- * TODO: This should not be required, backport it from Bill's GLSL code!
- */
-static unsigned char simplex[64][4] = {
-   {0, 1, 2, 3}, {0, 1, 3, 2}, {0, 0, 0, 0}, {0, 2, 3, 1},
-   {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {1, 2, 3, 0},
-   {0, 2, 1, 3}, {0, 0, 0, 0}, {0, 3, 1, 2}, {0, 3, 2, 1},
-   {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {1, 3, 2, 0},
-   {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0},
-   {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0},
-   {1, 2, 0, 3}, {0, 0, 0, 0}, {1, 3, 0, 2}, {0, 0, 0, 0},
-   {0, 0, 0, 0}, {0, 0, 0, 0}, {2, 3, 0, 1}, {2, 3, 1, 0},
-   {1, 0, 2, 3}, {1, 0, 3, 2}, {0, 0, 0, 0}, {0, 0, 0, 0},
-   {0, 0, 0, 0}, {2, 0, 3, 1}, {0, 0, 0, 0}, {2, 1, 3, 0},
-   {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0},
-   {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0},
-   {2, 0, 1, 3}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0},
-   {3, 0, 1, 2}, {3, 0, 2, 1}, {0, 0, 0, 0}, {3, 1, 2, 0},
-   {2, 1, 0, 3}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0},
-   {3, 1, 0, 2}, {0, 0, 0, 0}, {3, 2, 0, 1}, {3, 2, 1, 0}
-};
-
-
-/** 1D simplex noise */
-GLfloat
-_mesa_noise1(GLfloat x)
-{
-   int i0 = FASTFLOOR(x);
-   int i1 = i0 + 1;
-   float x0 = x - i0;
-   float x1 = x0 - 1.0f;
-   float t1 = 1.0f - x1 * x1;
-   float n0, n1;
-
-   float t0 = 1.0f - x0 * x0;
-/*  if(t0 < 0.0f) t0 = 0.0f; // this never happens for the 1D case */
-   t0 *= t0;
-   n0 = t0 * t0 * grad1(perm[i0 & 0xff], x0);
-
-/*  if(t1 < 0.0f) t1 = 0.0f; // this never happens for the 1D case */
-   t1 *= t1;
-   n1 = t1 * t1 * grad1(perm[i1 & 0xff], x1);
-   /* The maximum value of this noise is 8*(3/4)^4 = 2.53125 */
-   /* A factor of 0.395 would scale to fit exactly within [-1,1], but */
-   /* we want to match PRMan's 1D noise, so we scale it down some more. */
-   return 0.25f * (n0 + n1);
-}
-
-
-/** 2D simplex noise */
-GLfloat
-_mesa_noise2(GLfloat x, GLfloat y)
-{
-#define F2 0.366025403f         /* F2 = 0.5*(sqrt(3.0)-1.0) */
-#define G2 0.211324865f         /* G2 = (3.0-Math.sqrt(3.0))/6.0 */
-
-   float n0, n1, n2;            /* Noise contributions from the three corners */
-
-   /* Skew the input space to determine which simplex cell we're in */
-   float s = (x + y) * F2;      /* Hairy factor for 2D */
-   float xs = x + s;
-   float ys = y + s;
-   int i = FASTFLOOR(xs);
-   int j = FASTFLOOR(ys);
-
-   float t = (float) (i + j) * G2;
-   float X0 = i - t;            /* Unskew the cell origin back to (x,y) space */
-   float Y0 = j - t;
-   float x0 = x - X0;           /* The x,y distances from the cell origin */
-   float y0 = y - Y0;
-
-   float x1, y1, x2, y2;
-   int ii, jj;
-   float t0, t1, t2;
-
-   /* For the 2D case, the simplex shape is an equilateral triangle. */
-   /* Determine which simplex we are in. */
-   int i1, j1;                  /* Offsets for second (middle) corner of simplex in (i,j) coords */
-   if (x0 > y0) {
-      i1 = 1;
-      j1 = 0;
-   }                            /* lower triangle, XY order: (0,0)->(1,0)->(1,1) */
-   else {
-      i1 = 0;
-      j1 = 1;
-   }                            /* upper triangle, YX order: (0,0)->(0,1)->(1,1) */
-
-   /* A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and */
-   /* a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where */
-   /* c = (3-sqrt(3))/6 */
-
-   x1 = x0 - i1 + G2;           /* Offsets for middle corner in (x,y) unskewed coords */
-   y1 = y0 - j1 + G2;
-   x2 = x0 - 1.0f + 2.0f * G2;  /* Offsets for last corner in (x,y) unskewed coords */
-   y2 = y0 - 1.0f + 2.0f * G2;
-
-   /* Wrap the integer indices at 256, to avoid indexing perm[] out of bounds */
-   ii = i % 256;
-   jj = j % 256;
-
-   /* Calculate the contribution from the three corners */
-   t0 = 0.5f - x0 * x0 - y0 * y0;
-   if (t0 < 0.0f)
-      n0 = 0.0f;
-   else {
-      t0 *= t0;
-      n0 = t0 * t0 * grad2(perm[ii + perm[jj]], x0, y0);
-   }
-
-   t1 = 0.5f - x1 * x1 - y1 * y1;
-   if (t1 < 0.0f)
-      n1 = 0.0f;
-   else {
-      t1 *= t1;
-      n1 = t1 * t1 * grad2(perm[ii + i1 + perm[jj + j1]], x1, y1);
-   }
-
-   t2 = 0.5f - x2 * x2 - y2 * y2;
-   if (t2 < 0.0f)
-      n2 = 0.0f;
-   else {
-      t2 *= t2;
-      n2 = t2 * t2 * grad2(perm[ii + 1 + perm[jj + 1]], x2, y2);
-   }
-
-   /* Add contributions from each corner to get the final noise value. */
-   /* The result is scaled to return values in the interval [-1,1]. */
-   return 40.0f * (n0 + n1 + n2);       /* TODO: The scale factor is preliminary! */
-}
-
-
-/** 3D simplex noise */
-GLfloat
-_mesa_noise3(GLfloat x, GLfloat y, GLfloat z)
-{
-/* Simple skewing factors for the 3D case */
-#define F3 0.333333333f
-#define G3 0.166666667f
-
-   float n0, n1, n2, n3;        /* Noise contributions from the four corners */
-
-   /* Skew the input space to determine which simplex cell we're in */
-   float s = (x + y + z) * F3;  /* Very nice and simple skew factor for 3D */
-   float xs = x + s;
-   float ys = y + s;
-   float zs = z + s;
-   int i = FASTFLOOR(xs);
-   int j = FASTFLOOR(ys);
-   int k = FASTFLOOR(zs);
-
-   float t = (float) (i + j + k) * G3;
-   float X0 = i - t;            /* Unskew the cell origin back to (x,y,z) space */
-   float Y0 = j - t;
-   float Z0 = k - t;
-   float x0 = x - X0;           /* The x,y,z distances from the cell origin */
-   float y0 = y - Y0;
-   float z0 = z - Z0;
-
-   float x1, y1, z1, x2, y2, z2, x3, y3, z3;
-   int ii, jj, kk;
-   float t0, t1, t2, t3;
-
-   /* For the 3D case, the simplex shape is a slightly irregular tetrahedron. */
-   /* Determine which simplex we are in. */
-   int i1, j1, k1;              /* Offsets for second corner of simplex in (i,j,k) coords */
-   int i2, j2, k2;              /* Offsets for third corner of simplex in (i,j,k) coords */
-
-/* This code would benefit from a backport from the GLSL version! */
-   if (x0 >= y0) {
-      if (y0 >= z0) {
-         i1 = 1;
-         j1 = 0;
-         k1 = 0;
-         i2 = 1;
-         j2 = 1;
-         k2 = 0;
-      }                         /* X Y Z order */
-      else if (x0 >= z0) {
-         i1 = 1;
-         j1 = 0;
-         k1 = 0;
-         i2 = 1;
-         j2 = 0;
-         k2 = 1;
-      }                         /* X Z Y order */
-      else {
-         i1 = 0;
-         j1 = 0;
-         k1 = 1;
-         i2 = 1;
-         j2 = 0;
-         k2 = 1;
-      }                         /* Z X Y order */
-   }
-   else {                       /* x0<y0 */
-      if (y0 < z0) {
-         i1 = 0;
-         j1 = 0;
-         k1 = 1;
-         i2 = 0;
-         j2 = 1;
-         k2 = 1;
-      }                         /* Z Y X order */
-      else if (x0 < z0) {
-         i1 = 0;
-         j1 = 1;
-         k1 = 0;
-         i2 = 0;
-         j2 = 1;
-         k2 = 1;
-      }                         /* Y Z X order */
-      else {
-         i1 = 0;
-         j1 = 1;
-         k1 = 0;
-         i2 = 1;
-         j2 = 1;
-         k2 = 0;
-      }                         /* Y X Z order */
-   }
-
-   /* A step of (1,0,0) in (i,j,k) means a step of (1-c,-c,-c) in
-    * (x,y,z), a step of (0,1,0) in (i,j,k) means a step of
-    * (-c,1-c,-c) in (x,y,z), and a step of (0,0,1) in (i,j,k) means a
-    * step of (-c,-c,1-c) in (x,y,z), where c = 1/6.
-    */
-
-   x1 = x0 - i1 + G3;         /* Offsets for second corner in (x,y,z) coords */
-   y1 = y0 - j1 + G3;
-   z1 = z0 - k1 + G3;
-   x2 = x0 - i2 + 2.0f * G3;  /* Offsets for third corner in (x,y,z) coords */
-   y2 = y0 - j2 + 2.0f * G3;
-   z2 = z0 - k2 + 2.0f * G3;
-   x3 = x0 - 1.0f + 3.0f * G3;/* Offsets for last corner in (x,y,z) coords */
-   y3 = y0 - 1.0f + 3.0f * G3;
-   z3 = z0 - 1.0f + 3.0f * G3;
-
-   /* Wrap the integer indices at 256 to avoid indexing perm[] out of bounds */
-   ii = i % 256;
-   jj = j % 256;
-   kk = k % 256;
-
-   /* Calculate the contribution from the four corners */
-   t0 = 0.6f - x0 * x0 - y0 * y0 - z0 * z0;
-   if (t0 < 0.0f)
-      n0 = 0.0f;
-   else {
-      t0 *= t0;
-      n0 = t0 * t0 * grad3(perm[ii + perm[jj + perm[kk]]], x0, y0, z0);
-   }
-
-   t1 = 0.6f - x1 * x1 - y1 * y1 - z1 * z1;
-   if (t1 < 0.0f)
-      n1 = 0.0f;
-   else {
-      t1 *= t1;
-      n1 =
-         t1 * t1 * grad3(perm[ii + i1 + perm[jj + j1 + perm[kk + k1]]], x1,
-                         y1, z1);
-   }
-
-   t2 = 0.6f - x2 * x2 - y2 * y2 - z2 * z2;
-   if (t2 < 0.0f)
-      n2 = 0.0f;
-   else {
-      t2 *= t2;
-      n2 =
-         t2 * t2 * grad3(perm[ii + i2 + perm[jj + j2 + perm[kk + k2]]], x2,
-                         y2, z2);
-   }
-
-   t3 = 0.6f - x3 * x3 - y3 * y3 - z3 * z3;
-   if (t3 < 0.0f)
-      n3 = 0.0f;
-   else {
-      t3 *= t3;
-      n3 =
-         t3 * t3 * grad3(perm[ii + 1 + perm[jj + 1 + perm[kk + 1]]], x3, y3,
-                         z3);
-   }
-
-   /* Add contributions from each corner to get the final noise value.
-    * The result is scaled to stay just inside [-1,1]
-    */
-   return 32.0f * (n0 + n1 + n2 + n3);  /* TODO: The scale factor is preliminary! */
-}
-
-
-/** 4D simplex noise */
-GLfloat
-_mesa_noise4(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
-{
-   /* The skewing and unskewing factors are hairy again for the 4D case */
-#define F4 0.309016994f         /* F4 = (Math.sqrt(5.0)-1.0)/4.0 */
-#define G4 0.138196601f         /* G4 = (5.0-Math.sqrt(5.0))/20.0 */
-
-   float n0, n1, n2, n3, n4;    /* Noise contributions from the five corners */
-
-   /* Skew the (x,y,z,w) space to determine which cell of 24 simplices we're in */
-   float s = (x + y + z + w) * F4;      /* Factor for 4D skewing */
-   float xs = x + s;
-   float ys = y + s;
-   float zs = z + s;
-   float ws = w + s;
-   int i = FASTFLOOR(xs);
-   int j = FASTFLOOR(ys);
-   int k = FASTFLOOR(zs);
-   int l = FASTFLOOR(ws);
-
-   float t = (i + j + k + l) * G4;      /* Factor for 4D unskewing */
-   float X0 = i - t;            /* Unskew the cell origin back to (x,y,z,w) space */
-   float Y0 = j - t;
-   float Z0 = k - t;
-   float W0 = l - t;
-
-   float x0 = x - X0;           /* The x,y,z,w distances from the cell origin */
-   float y0 = y - Y0;
-   float z0 = z - Z0;
-   float w0 = w - W0;
-
-   /* For the 4D case, the simplex is a 4D shape I won't even try to describe.
-    * To find out which of the 24 possible simplices we're in, we need to
-    * determine the magnitude ordering of x0, y0, z0 and w0.
-    * The method below is a good way of finding the ordering of x,y,z,w and
-    * then find the correct traversal order for the simplex we're in.
-    * First, six pair-wise comparisons are performed between each possible pair
-    * of the four coordinates, and the results are used to add up binary bits
-    * for an integer index.
-    */
-   int c1 = (x0 > y0) ? 32 : 0;
-   int c2 = (x0 > z0) ? 16 : 0;
-   int c3 = (y0 > z0) ? 8 : 0;
-   int c4 = (x0 > w0) ? 4 : 0;
-   int c5 = (y0 > w0) ? 2 : 0;
-   int c6 = (z0 > w0) ? 1 : 0;
-   int c = c1 + c2 + c3 + c4 + c5 + c6;
-
-   int i1, j1, k1, l1;  /* The integer offsets for the second simplex corner */
-   int i2, j2, k2, l2;  /* The integer offsets for the third simplex corner */
-   int i3, j3, k3, l3;  /* The integer offsets for the fourth simplex corner */
-
-   float x1, y1, z1, w1, x2, y2, z2, w2, x3, y3, z3, w3, x4, y4, z4, w4;
-   int ii, jj, kk, ll;
-   float t0, t1, t2, t3, t4;
-
-   /*
-    * simplex[c] is a 4-vector with the numbers 0, 1, 2 and 3 in some
-    * order.  Many values of c will never occur, since e.g. x>y>z>w
-    * makes x<z, y<w and x<w impossible. Only the 24 indices which
-    * have non-zero entries make any sense.  We use a thresholding to
-    * set the coordinates in turn from the largest magnitude.  The
-    * number 3 in the "simplex" array is at the position of the
-    * largest coordinate.
-    */
-   i1 = simplex[c][0] >= 3 ? 1 : 0;
-   j1 = simplex[c][1] >= 3 ? 1 : 0;
-   k1 = simplex[c][2] >= 3 ? 1 : 0;
-   l1 = simplex[c][3] >= 3 ? 1 : 0;
-   /* The number 2 in the "simplex" array is at the second largest coordinate. */
-   i2 = simplex[c][0] >= 2 ? 1 : 0;
-   j2 = simplex[c][1] >= 2 ? 1 : 0;
-   k2 = simplex[c][2] >= 2 ? 1 : 0;
-   l2 = simplex[c][3] >= 2 ? 1 : 0;
-   /* The number 1 in the "simplex" array is at the second smallest coordinate. */
-   i3 = simplex[c][0] >= 1 ? 1 : 0;
-   j3 = simplex[c][1] >= 1 ? 1 : 0;
-   k3 = simplex[c][2] >= 1 ? 1 : 0;
-   l3 = simplex[c][3] >= 1 ? 1 : 0;
-   /* The fifth corner has all coordinate offsets = 1, so no need to look that up. */
-
-   x1 = x0 - i1 + G4;           /* Offsets for second corner in (x,y,z,w) coords */
-   y1 = y0 - j1 + G4;
-   z1 = z0 - k1 + G4;
-   w1 = w0 - l1 + G4;
-   x2 = x0 - i2 + 2.0f * G4;    /* Offsets for third corner in (x,y,z,w) coords */
-   y2 = y0 - j2 + 2.0f * G4;
-   z2 = z0 - k2 + 2.0f * G4;
-   w2 = w0 - l2 + 2.0f * G4;
-   x3 = x0 - i3 + 3.0f * G4;    /* Offsets for fourth corner in (x,y,z,w) coords */
-   y3 = y0 - j3 + 3.0f * G4;
-   z3 = z0 - k3 + 3.0f * G4;
-   w3 = w0 - l3 + 3.0f * G4;
-   x4 = x0 - 1.0f + 4.0f * G4;  /* Offsets for last corner in (x,y,z,w) coords */
-   y4 = y0 - 1.0f + 4.0f * G4;
-   z4 = z0 - 1.0f + 4.0f * G4;
-   w4 = w0 - 1.0f + 4.0f * G4;
-
-   /* Wrap the integer indices at 256, to avoid indexing perm[] out of bounds */
-   ii = i % 256;
-   jj = j % 256;
-   kk = k % 256;
-   ll = l % 256;
-
-   /* Calculate the contribution from the five corners */
-   t0 = 0.6f - x0 * x0 - y0 * y0 - z0 * z0 - w0 * w0;
-   if (t0 < 0.0f)
-      n0 = 0.0f;
-   else {
-      t0 *= t0;
-      n0 =
-         t0 * t0 * grad4(perm[ii + perm[jj + perm[kk + perm[ll]]]], x0, y0,
-                         z0, w0);
-   }
-
-   t1 = 0.6f - x1 * x1 - y1 * y1 - z1 * z1 - w1 * w1;
-   if (t1 < 0.0f)
-      n1 = 0.0f;
-   else {
-      t1 *= t1;
-      n1 =
-         t1 * t1 *
-         grad4(perm[ii + i1 + perm[jj + j1 + perm[kk + k1 + perm[ll + l1]]]],
-               x1, y1, z1, w1);
-   }
-
-   t2 = 0.6f - x2 * x2 - y2 * y2 - z2 * z2 - w2 * w2;
-   if (t2 < 0.0f)
-      n2 = 0.0f;
-   else {
-      t2 *= t2;
-      n2 =
-         t2 * t2 *
-         grad4(perm[ii + i2 + perm[jj + j2 + perm[kk + k2 + perm[ll + l2]]]],
-               x2, y2, z2, w2);
-   }
-
-   t3 = 0.6f - x3 * x3 - y3 * y3 - z3 * z3 - w3 * w3;
-   if (t3 < 0.0f)
-      n3 = 0.0f;
-   else {
-      t3 *= t3;
-      n3 =
-         t3 * t3 *
-         grad4(perm[ii + i3 + perm[jj + j3 + perm[kk + k3 + perm[ll + l3]]]],
-               x3, y3, z3, w3);
-   }
-
-   t4 = 0.6f - x4 * x4 - y4 * y4 - z4 * z4 - w4 * w4;
-   if (t4 < 0.0f)
-      n4 = 0.0f;
-   else {
-      t4 *= t4;
-      n4 =
-         t4 * t4 *
-         grad4(perm[ii + 1 + perm[jj + 1 + perm[kk + 1 + perm[ll + 1]]]], x4,
-               y4, z4, w4);
-   }
-
-   /* Sum up and scale the result to cover the range [-1,1] */
-   return 27.0f * (n0 + n1 + n2 + n3 + n4);     /* TODO: The scale factor is preliminary! */
-}