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-rw-r--r--Stars45/Water.cpp293
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diff --git a/Stars45/Water.cpp b/Stars45/Water.cpp
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--- a/Stars45/Water.cpp
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@@ -1,293 +0,0 @@
-/* Starshatter: The Open Source Project
- Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
- Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
- Copyright (c) 1997-2006, Destroyer Studios LLC.
-
- AUTHOR: John DiCamillo
-
-
- OVERVIEW
- ========
- Water surface effect w/ reflection and caustics
-*/
-
-#include "Water.h"
-#include "Random.h"
-
-// +--------------------------------------------------------------------+
-
-struct WATER_REFRACT
-{
- // Vrefract = (V + refract * N) * norm
- float refract;
- float refractNorm;
- DWORD diffuse;
-};
-
-struct WATER_SURFACE
-{
- float height;
- Vec3 normal;
-};
-
-// +--------------------------------------------------------------------+
-
-#if defined(_X86) && !defined(_WIN64)
-inline int f2i(float flt)
-{
- volatile int n;
-
- __asm
- {
- fld flt
- fistp n
- }
-
- return n;
-}
-#else
-inline int f2i(float flt)
-{
- return (int) flt;
-}
-#endif
-
-
-// +--------------------------------------------------------------------+
-
-static WATER_REFRACT RefractionTable[512];
-static bool refractInit = false;
-
-static const int WAVE_SIZE = 256;
-static const DWORD WAVE_MASK = 0xff;
-
-// +--------------------------------------------------------------------+
-
-Water::Water()
-: size(0), depth(0), scaleTex(1), avgHeight(0),
-nVertices(0), surface(0), waves(0)
-{
-}
-
-Water::~Water()
-{
- delete [] surface;
- delete [] waves;
-}
-
-// +--------------------------------------------------------------------+
-
-void
-Water::Init(int n, float s, float d)
-{
- size = s;
- depth = d;
- scaleTex = 1/size;
-
- // Calculate number of vertices
- nVertices = n;
-
- // Create refraction table
- if (!refractInit) {
- WATER_REFRACT* refract = &RefractionTable[256];
-
- for (UINT u = 0; u < 256; u++) {
- float fCos0 = (float) u / (float) 256.0f;
- float f0 = acosf(fCos0);
- float fSin0 = sinf(f0);
-
- float fSin1 = fSin0 / 1.333f; // water
- float f1 = asinf(fSin1);
- float fCos1 = cosf(f1);
-
- refract[u].refract = fSin0 / fSin1 * fCos1 - fCos0;
- refract[u].refractNorm = - fSin1 / fSin0;
- refract[u].diffuse = ((((0xff - u)*(0xff - u)*(0xff - u)) << 8) & 0xff000000);
-
- RefractionTable[u] = RefractionTable[256];
- }
-
- refractInit = true;
- }
-
- // Create maps
- if (surface)
- delete [] surface;
-
- surface = new WATER_SURFACE[n*n];
- ZeroMemory(surface, n*n * sizeof(WATER_SURFACE));
-
- if (waves)
- delete [] waves;
-
- waves = new float[WAVE_SIZE*4];
-
- double f = 1.0 / (double) WAVE_SIZE;
- for (int i = 0; i < WAVE_SIZE; i++) {
- double s0 = sin(2*PI*i*f);
- double s1 = sin(4*PI*i*f);
- double s2 = sin(6*PI*i*f);
- double s3 = sin(8*PI*i*f);
-
- waves[0*WAVE_SIZE + i] = (float) (1.8 * s0*s0 - 0.9);
- waves[1*WAVE_SIZE + i] = (float) (1.6 * s1*s1 - 0.8);
- waves[2*WAVE_SIZE + i] = (float) (0.4 * s2);
- waves[3*WAVE_SIZE + i] = (float) (0.8 * s3*s3 - 0.4);
- }
-
- for (int i = 0; i < 4; i++) {
- offsets[i] = (float) Random(0, WAVE_SIZE);
- }
-
- offsets[4] = 12.45f;
- offsets[5] = 14.23f;
- offsets[6] = 16.72f;
- offsets[7] = 20.31f;
-}
-
-// +--------------------------------------------------------------------+
-
-void
-Water::CalcWaves(double seconds)
-{
- int i, n[4];
- UINT SIZE = nVertices;
- UINT STEP = WAVE_SIZE / (SIZE-1);
- UINT STEP2 = STEP/2;
- UINT AREA = SIZE * SIZE;
- UINT x, y;
-
- for (i = 0; i < 4; i++) {
- n[i] = (int) offsets[i];
- }
-
- WATER_SURFACE* pSurf = surface;
-
- // compute heights
- for (y = 0; y < SIZE; y++) {
- for (x = 0; x < SIZE; x++) {
- float h = 0;
- h += waves[ ((n[0] + x*STEP
- - y*STEP2) & WAVE_MASK) + 0*WAVE_SIZE ];
- h += waves[ ((n[1] + x*STEP2
- + y*STEP) & WAVE_MASK) + 1*WAVE_SIZE ];
- h += waves[ ((n[2] + x*STEP) & WAVE_MASK) + 2*WAVE_SIZE ];
- h += waves[ ((n[3] + y*STEP) & WAVE_MASK) + 3*WAVE_SIZE ];
-
- pSurf->height = h * depth;
- pSurf++;
- }
- }
-
- // compute normals
- UINT uXN, uX0, uXP;
- UINT uYN, uY0, uYP;
-
- uYP = AREA - SIZE;
- uY0 = 0;
- uYN = SIZE;
-
- for (y = 0; y < SIZE; y++) {
- uXP = SIZE - 1;
- uX0 = 0;
- uXN = 1;
-
- for (x = 0; x < SIZE; x++) {
- Vec3 vecN;
- float f;
-
- f = surface[uXN + uYN].height - surface[uXP + uYP].height; vecN.x = vecN.z = f;
- f = surface[uX0 + uYN].height - surface[uX0 + uYP].height; vecN.z += f;
- f = surface[uXP + uYN].height - surface[uXN + uYP].height; vecN.x -= f; vecN.z += f;
- f = surface[uXN + uY0].height - surface[uXP + uY0].height; vecN.x += f;
-
- vecN.y = -15.0f * depth;
- vecN.Normalize();
-
- surface[uX0 + uY0].normal = vecN * -1.0f;
-
- uXP = uX0;
- uX0 = uXN;
- uXN = (uXN + 1) % SIZE;
- }
-
- uYP = uY0;
- uY0 = uYN;
- uYN = (uYN + SIZE) % AREA;
- }
-
- // update offsets
- for (i = 0; i < 4; i++) {
- offsets[i] += (float) (offsets[i+4] * seconds);
-
- if (offsets[i] > WAVE_SIZE)
- offsets[i] -= WAVE_SIZE;
- }
-
-}
-
-// +--------------------------------------------------------------------+
-
-void
-Water::UpdateSurface(Vec3& eyePos, VertexSet* vset)
-{
- UINT SIZE = nVertices;
- UINT AREA = SIZE * SIZE;
- UINT x, y;
-
- WATER_SURFACE* pSurf = surface;
- Vec3* pLoc = vset->loc;
- Vec3* pNorm = vset->nrm;
- DWORD* pDiff = vset->diffuse;
- float* pTu = vset->tu;
- float* pTv = vset->tv;
-
- float fInc = 1.0f / (float) (SIZE-1);
- float fx = 0.0f;
- float fz = 0.0f;
-
- for (y = 0; y < SIZE; y++) {
- for (x = 0; x < SIZE; x++) {
- // update vertex height and normal
- pLoc->y += pSurf->height;
- *pNorm = pSurf->normal;
-
- /*
- // Update texture coords and diffuse based upon refraction
- Vec3 vec = eyePos - *pLoc;
- vec.Normalize();
-
- WATER_REFRACT *pRefract;
- pRefract = RefractionTable + 256 + f2i(vec.dot(*pNorm) * 255.0f);
-
- *pDiff = pRefract->diffuse;
-
- // compute apparent displacement
- Vec3 vecD = (pSurf->normal * pRefract->refract + vec) * pRefract->refractNorm;
- Vec3 vecP = *pLoc;
- vecP.y -= depth;
-
- // perturb texture coords
- float fB = vecD * vecP * 2.0f;
- float fD = fB * fB - depth;
- float fScale = (-fB + sqrtf(fD)) * 0.5f;
-
- *pTu = vecD.x * fScale + fx;
- *pTv = vecD.z * fScale + fz;
- */
-
- fx += fInc;
- pSurf++;
- pLoc++;
- pNorm++;
- pDiff++;
- pTu++;
- pTv++;
- }
-
- fx = 0.0f;
- fz += fInc;
- }
-}
-
-
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