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main.cpp
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main.cpp
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#include <algorithm>
#include <fstream>
#include <iostream>
#include <cmath>
#include <vector>
#include <new>
#include <exception>
using namespace std;
#include "GL/glew.h"
#include "GL/freeglut.h"
#include "AntTweakBar.h"
#include "vec4.h"
#include "mat4.h"
#include "Program.h"
#ifdef _WIN32
#include <windows.h>
#include <time.h>
#else
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#endif
//#define _BENCH
#define BUFFER_OFFSET(i) ((char *)NULL + (i))
enum {
// textures
TEXTURE_IRRADIANCE = 0,
TEXTURE_INSCATTER,
TEXTURE_TRANSMITTANCE,
TEXTURE_SKY,
TEXTURE_NOISE,
TEXTURE_SPECTRUM12,
TEXTURE_SPECTRUM34,
TEXTURE_SLOPE_VARIANCE,
TEXTURE_FFT_PING,
TEXTURE_FFT_PONG,
TEXTURE_BUTTERFLY,
TEXTURE_GAUSSZ,
TEXTURE_COUNT,
// buffers
BUFFER_GRID_INDEX = 0,
BUFFER_GRID_VERTEX,
BUFFER_COUNT,
// renderenderbuffers
RENDERBUFFER_DEPTH = 0,
RENDERBUFFER_COUNT,
// framebuffers
FRAMEBUFFER_FFT0 = 0,
FRAMEBUFFER_FFT1,
FRAMEBUFFER_SKY,
FRAMEBUFFER_VARIANCES,
FRAMEBUFFER_GAUSS,
FRAMEBUFFER_COUNT,
// programs
PROGRAM_RENDER = 0,
PROGRAM_SKY,
PROGRAM_SKYMAP,
PROGRAM_CLOUDS,
PROGRAM_SHOW_SPECTRUM,
PROGRAM_INIT,
PROGRAM_VARIANCES,
PROGRAM_FFTX,
PROGRAM_FFTY,
PROGRAM_WHITECAP_PRECOMPUTE,
PROGRAM_COUNT
};
GLuint renderbuffers[RENDERBUFFER_COUNT];
GLuint framebuffers[FRAMEBUFFER_COUNT];
GLuint textures[TEXTURE_COUNT];
GLuint buffers[BUFFER_COUNT];
Program* programs[PROGRAM_COUNT];
namespace {
// Window Variables
namespace window {
const int width = 600+220;
const int height = 600;
} // namespace window
// TW
namespace tw
{
TwBar* bar = NULL;
}
// camera
namespace camera
{
float z = 3.5f;
float velx = 0.0f;
float vely = 0.0f;
float velz = 0.00f;
float x = 0.0f;
float y = 0.0f;
float theta = 27.0f;
float phi = -625.f;
float fovy = 90.0f;
float vel = 2.0f;
}
// app speed
GLdouble appSpeed = 0.0f;
// Various
unsigned int skyTexSize = 256;
bool cloudLayer = false;
float octaves = 10.0;
float lacunarity = 2.2;
float gain = 0.7;
float norm = 0.5;
float clamp1 = -0.15;
float clamp2 = 0.2;
float cloudColor[4] = { 1.0, 1.0, 1.0, 1.0 };
vec4f vboParams;
int vboSize = 0;
int vboVertices = 0;
float sunTheta = 0.6*M_PI / 2.0 - 0.05;
float sunPhi = 0.0;
float gridSize = 4.0f;
// render ing options
float seaColor[4] = {11.0 / 255.0, 121.0 / 255.0, 49.0 / 255.0, 140 / 255.0};
float hdrExposure = 1.05;
bool grid = false;
bool animate = true;
bool seaContrib = true;
bool sunContrib = true;
bool skyContrib = true;
bool foamContrib = true;
bool manualFilter = false;
bool show_spectrum = false;
float show_spectrum_zoom = 1.0;
bool show_spectrum_linear = false;
bool normals = false;
bool choppy = true;
float choppy_factor0 = 2.3f; // Control Choppiness
float choppy_factor1 = 2.1f; // Control Choppiness
float choppy_factor2 = 1.3f; // Control Choppiness
float choppy_factor3 = 0.9f; // Control Choppiness
// WAVES SPECTRUM
const int N_SLOPE_VARIANCE = 4; // size of the 3d texture containing precomputed filtered slope variances
float GRID1_SIZE = 893.0; // size in meters (i.e. in spatial domain) of the first grid
float GRID2_SIZE = 101.0; // size in meters (i.e. in spatial domain) of the second grid
float GRID3_SIZE = 21.0; //51 // size in meters (i.e. in spatial domain) of the third grid
float GRID4_SIZE = 11.0; // size in meters (i.e. in spatial domain) of the fourth grid
float WIND = 12.0; // wind speed in meters per second (at 10m above surface)
float OMEGA = 2.0f; // sea state (inverse wave age)
bool propagate = true; // wave propagation?
float A = 2.0; // wave amplitude factor (should be one)
const float cm = 0.23; // Eq 59
const float km = 370.0; // Eq 59
float speed = 1.0f;
bool loadStats=false;
// FFT WAVES
const int PASSES = 8; // number of passes needed for the FFT 6 -> 64, 7 -> 128, 8 -> 256, etc
const int FFT_SIZE = 1 << PASSES; // size of the textures storing the waves in frequency and spatial domains
float *spectrum12 = NULL;
float *spectrum34 = NULL;
// Foam
float jacobian_scale = 0.2f;
#ifdef _BENCH
std::ofstream gnuplot("perf.dat", std::ofstream::out);
#endif //_BENCH
} // namespace
float sqr(float x)
{
return x * x;
}
float omega(float k)
{
return sqrt(9.81 * k * (1.0 + sqr(k / km))); // Eq 24
}
// 1/kx and 1/ky in meters
float spectrum(float kx, float ky, bool omnispectrum = false)
{
float U10 = WIND;
float Omega = OMEGA;
// phase speed
float k = sqrt(kx * kx + ky * ky);
float c = omega(k) / k;
// spectral peak
float kp = 9.81 * sqr(Omega / U10); // after Eq 3
float cp = omega(kp) / kp;
// friction velocity
float z0 = 3.7e-5 * sqr(U10) / 9.81 * pow(U10 / cp, 0.9f); // Eq 66
float u_star = 0.41 * U10 / log(10.0 / z0); // Eq 60
float Lpm = exp(- 5.0 / 4.0 * sqr(kp / k)); // after Eq 3
float gamma = Omega < 1.0 ? 1.7 : 1.7 + 6.0 * log(Omega); // after Eq 3 // log10 or log??
float sigma = 0.08 * (1.0 + 4.0 / pow(Omega, 3.0f)); // after Eq 3
float Gamma = exp(-1.0 / (2.0 * sqr(sigma)) * sqr(sqrt(k / kp) - 1.0));
float Jp = pow(gamma, Gamma); // Eq 3
float Fp = Lpm * Jp * exp(- Omega / sqrt(10.0) * (sqrt(k / kp) - 1.0)); // Eq 32
float alphap = 0.006 * sqrt(Omega); // Eq 34
float Bl = 0.5 * alphap * cp / c * Fp; // Eq 31
float alpham = 0.01 * (u_star < cm ? 1.0 + log(u_star / cm) : 1.0 + 3.0 * log(u_star / cm)); // Eq 44
float Fm = exp(-0.25 * sqr(k / km - 1.0)); // Eq 41
float Bh = 0.5 * alpham * cm / c * Fm; // Eq 40
Bh *= Lpm;
if (omnispectrum)
{
return A * (Bl + Bh) / (k * sqr(k)); // Eq 30
}
float a0 = log(2.0) / 4.0;
float ap = 4.0;
float am = 0.13 * u_star / cm; // Eq 59
float Delta = tanh(a0 + ap * pow(c / cp, 2.5f) + am * pow(cm / c, 2.5f)); // Eq 57
float phi = atan2(ky, kx);
if (propagate)
{
if (kx < 0.0)
{
return 0.0;
}
else
{
Bl *= 2.0;
Bh *= 2.0;
}
}
// remove waves perpendicular to wind dir
float tweak = sqrt(std::max(kx/sqrt(kx*kx+ky*ky),0.0f));
tweak = 1.0f;
return A * (Bl + Bh) * (1.0 + Delta * cos(2.0 * phi)) / (2.0 * M_PI * sqr(sqr(k))) * tweak; // Eq 67
}
void drawQuad()
{
glBegin(GL_TRIANGLE_STRIP);
glVertex4f(-1.0, -1.0, 0.0, 0.0);
glVertex4f(+1.0, -1.0, 1.0, 0.0);
glVertex4f(-1.0, +1.0, 0.0, 1.0);
glVertex4f(+1.0, +1.0, 1.0, 1.0);
glEnd();
}
// ----------------------------------------------------------------------------
// CLOUDS
// ----------------------------------------------------------------------------
void drawClouds(const vec4f &sun, const mat4f &mat)
{
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glUseProgram(programs[PROGRAM_CLOUDS]->program);
glUniformMatrix4fv(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "worldToScreen"), 1, true, mat.coefficients());
glUniform3f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "worldCamera"), 0.0, 0.0, camera::z);
glUniform3f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "worldSunDir"), sun.x, sun.y, sun.z);
glUniform1f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "hdrExposure"), hdrExposure);
glUniform1f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "octaves"), octaves);
glUniform1f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "lacunarity"), lacunarity);
glUniform1f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "gain"), gain);
glUniform1f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "norm"), norm);
glUniform1f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "clamp1"), clamp1);
glUniform1f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "clamp2"), clamp2);
glUniform4f(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "cloudsColor"), cloudColor[0], cloudColor[1], cloudColor[2], cloudColor[3]);
glBegin(GL_TRIANGLE_STRIP);
glVertex3f(-1e6, -1e6, 500.0);
glVertex3f(1e6, -1e6, 500.0);
glVertex3f(-1e6, 1e6, 500.0);
glVertex3f(1e6, 1e6, 500.0);
glEnd();
glDisable(GL_BLEND);
}
// ----------------------------------------------------------------------------
// PROGRAM RELOAD
// ----------------------------------------------------------------------------
void loadPrograms(bool all)
{
char* files[2];
char options[512];
files[0] = "atmosphere.glsl";
files[1] = "ocean.glsl";
sprintf(options, "#define %sSEA_CONTRIB\n#define %sSUN_CONTRIB\n#define %sSKY_CONTRIB\n#define %sCLOUDS\n#define %sHARDWARE_ANISTROPIC_FILTERING\n#define %sFOAM_CONTRIB\n",
seaContrib ? "" : "NO_", sunContrib ? "" : "NO_", skyContrib ? "" : "NO_", cloudLayer ? "" : "NO_", manualFilter ? "NO_" : "", foamContrib ? "" : "NO_");
if (programs[PROGRAM_RENDER] != NULL)
{
delete programs[PROGRAM_RENDER];
programs[PROGRAM_RENDER] = NULL;
}
programs[PROGRAM_RENDER] = new Program(2, files, options);
glUseProgram(programs[PROGRAM_RENDER]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "skyIrradianceSampler"), TEXTURE_IRRADIANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "inscatterSampler"), TEXTURE_INSCATTER);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "transmittanceSampler"), TEXTURE_TRANSMITTANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "skySampler"), TEXTURE_SKY);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "spectrum_1_2_Sampler"), TEXTURE_SPECTRUM12);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "spectrum_3_4_Sampler"), TEXTURE_SPECTRUM34);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "slopeVarianceSampler"), TEXTURE_SLOPE_VARIANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_RENDER]->program, "foamDistribution"), TEXTURE_GAUSSZ);
if (!all)
{
return;
}
files[0] = "atmosphere.glsl";
files[1] = "sky.glsl";
if (programs[PROGRAM_SKY] != NULL)
{
delete programs[PROGRAM_SKY];
programs[PROGRAM_SKY] = NULL;
}
programs[PROGRAM_SKY] = new Program(2, files, options);
glUseProgram(programs[PROGRAM_SKY]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKY]->program, "IrradianceSampler"), TEXTURE_IRRADIANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKY]->program, "inscatterSampler"), TEXTURE_INSCATTER);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKY]->program, "transmittanceSampler"), TEXTURE_TRANSMITTANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKY]->program, "skySampler"), TEXTURE_SKY);
files[0] = "atmosphere.glsl";
files[1] = "skymap.glsl";
if (programs[PROGRAM_SKYMAP] != NULL)
{
delete programs[PROGRAM_SKYMAP];
programs[PROGRAM_SKYMAP] = NULL;
}
programs[PROGRAM_SKYMAP] = new Program(2, files, options);
glUseProgram(programs[PROGRAM_SKYMAP]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKYMAP]->program, "skyIrradianceSampler"), TEXTURE_IRRADIANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKYMAP]->program, "inscatterSampler"), TEXTURE_INSCATTER);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKYMAP]->program, "transmittanceSampler"), TEXTURE_TRANSMITTANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SKYMAP]->program, "noiseSampler"), TEXTURE_NOISE);
if (programs[PROGRAM_CLOUDS] == NULL)
{
files[0] = "atmosphere.glsl";
files[1] = "clouds.glsl";
programs[PROGRAM_CLOUDS] = new Program(2, files);
glUseProgram(programs[PROGRAM_CLOUDS]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "skyIrradianceSampler"), TEXTURE_IRRADIANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "inscatterSampler"), TEXTURE_INSCATTER);
glUniform1i(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "transmittanceSampler"), TEXTURE_TRANSMITTANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_CLOUDS]->program, "noiseSampler"), TEXTURE_NOISE);
}
files[0] = "spectrum.glsl";
if (programs[PROGRAM_SHOW_SPECTRUM] != NULL)
{
delete programs[PROGRAM_SHOW_SPECTRUM];
programs[PROGRAM_SHOW_SPECTRUM] = NULL;
}
programs[PROGRAM_SHOW_SPECTRUM] = new Program(1, files);
glUseProgram(programs[PROGRAM_SHOW_SPECTRUM]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SHOW_SPECTRUM]->program, "spectrum_1_2_Sampler"), TEXTURE_SPECTRUM12);
glUniform1i(glGetUniformLocation(programs[PROGRAM_SHOW_SPECTRUM]->program, "spectrum_3_4_Sampler"), TEXTURE_SPECTRUM34);
files[0] = "init.glsl";
if (programs[PROGRAM_INIT] != NULL)
{
delete programs[PROGRAM_INIT];
programs[PROGRAM_INIT] = NULL;
}
programs[PROGRAM_INIT] = new Program(1, files);
glUseProgram(programs[PROGRAM_INIT]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_INIT]->program, "spectrum_1_2_Sampler"), TEXTURE_SPECTRUM12);
glUniform1i(glGetUniformLocation(programs[PROGRAM_INIT]->program, "spectrum_3_4_Sampler"), TEXTURE_SPECTRUM34);
files[0] = "variances.glsl";
if (programs[PROGRAM_VARIANCES] != NULL)
{
delete programs[PROGRAM_VARIANCES];
programs[PROGRAM_VARIANCES] = NULL;
}
programs[PROGRAM_VARIANCES] = new Program(1, files);
glUseProgram(programs[PROGRAM_VARIANCES]->program);
glUniform1f(glGetUniformLocation(programs[PROGRAM_VARIANCES]->program, "N_SLOPE_VARIANCE"), N_SLOPE_VARIANCE);
glUniform1i(glGetUniformLocation(programs[PROGRAM_VARIANCES]->program, "spectrum_1_2_Sampler"), TEXTURE_SPECTRUM12);
glUniform1i(glGetUniformLocation(programs[PROGRAM_VARIANCES]->program, "spectrum_3_4_Sampler"), TEXTURE_SPECTRUM34);
glUniform1i(glGetUniformLocation(programs[PROGRAM_VARIANCES]->program, "FFT_SIZE"), FFT_SIZE);
files[0] = "fftx.glsl";
if (programs[PROGRAM_FFTX] != NULL)
{
delete programs[PROGRAM_FFTX];
programs[PROGRAM_FFTX] = NULL;
}
programs[PROGRAM_FFTX] = new Program(1, files);
glProgramParameteriEXT(programs[PROGRAM_FFTX]->program, GL_GEOMETRY_VERTICES_OUT_EXT, 24);
glLinkProgram(programs[PROGRAM_FFTX]->program);
glUseProgram(programs[PROGRAM_FFTX]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTX]->program, "butterflySampler"), TEXTURE_BUTTERFLY);
files[0] = "ffty.glsl";
if (programs[PROGRAM_FFTY] != NULL)
{
delete programs[PROGRAM_FFTY];
programs[PROGRAM_FFTY] = NULL;
}
programs[PROGRAM_FFTY] = new Program(1, files);
glProgramParameteriEXT(programs[PROGRAM_FFTY]->program, GL_GEOMETRY_VERTICES_OUT_EXT, 24);
glLinkProgram(programs[PROGRAM_FFTY]->program);
glUseProgram(programs[PROGRAM_FFTY]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTY]->program, "butterflySampler"), TEXTURE_BUTTERFLY);
files[0] = "whitecap_precompute.glsl";
if (programs[PROGRAM_WHITECAP_PRECOMPUTE] != NULL)
{
delete programs[PROGRAM_WHITECAP_PRECOMPUTE];
programs[PROGRAM_WHITECAP_PRECOMPUTE] = NULL;
}
programs[PROGRAM_WHITECAP_PRECOMPUTE] = new Program(1, files);
// Back to default pipeline
glUseProgram(0);
}
// ----------------------------------------------------------------------------
// MESH GENERATION
// ----------------------------------------------------------------------------
float frandom(long *seed);
void generateMesh()
{
if (vboSize != 0)
{
glDeleteBuffers(1, &buffers[BUFFER_GRID_VERTEX]);
glDeleteBuffers(1, &buffers[BUFFER_GRID_INDEX]);
}
glGenBuffers(1, &buffers[BUFFER_GRID_VERTEX]); // Hope there's a good memory manager ...
glBindBuffer(GL_ARRAY_BUFFER, buffers[BUFFER_GRID_VERTEX]);
float horizon = tan(camera::theta / 180.0 * M_PI);
float s = min(1.1f, 0.5f + horizon * 0.5f);
float vmargin = 0.1;
float hmargin = 0.1;
// vboParams = vec4f(window::width, window::height, gridSize, camera::theta);
vec4f *data = new vec4f[int(ceil(window::height * (s + vmargin) / gridSize) + 5) * int(ceil(window::width * (1.0 + 2.0 * hmargin) / gridSize) + 5)];
// long seed = 1234;
int n = 0;
int nx = 0;
for (float j = window::height * s - 0.1/* - gridSize*/; j > -window::height * vmargin - gridSize; j -= gridSize)
{
nx = 0;
for (float i = -window::width * hmargin; i < window::width * (1.0 + hmargin) + gridSize; i += gridSize)
{
data[n++] = vec4f(-1.0 + 2.0 * i / window::width, -1.0 + 2.0 * j / window::height, 0.0, 1.0);
nx++;
}
}
vboVertices = n;
glBufferData(GL_ARRAY_BUFFER, n * 16, data, GL_STATIC_DRAW);
delete[] data;
glGenBuffers(1, &buffers[BUFFER_GRID_INDEX]);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[BUFFER_GRID_INDEX]);
vboSize = 0;
GLuint *indices = new GLuint[6 * int(ceil(window::height * (s + vmargin) / gridSize) + 4) * int(ceil(window::width * (1.0 + 2.0 * hmargin) / gridSize) + 4)];
int nj = 0;
for (float j = window::height * s - 0.1; j > -window::height * vmargin; j -= gridSize)
{
int ni = 0;
for (float i = -window::width * hmargin; i < window::width * (1.0 + hmargin); i += gridSize)
{
indices[vboSize++] = ni + (nj + 1) * nx;
indices[vboSize++] = (ni + 1) + (nj + 1) * nx;
indices[vboSize++] = (ni + 1) + nj * nx;
indices[vboSize++] = ni + nj * nx;
indices[vboSize++] = ni + (nj + 1) * nx;
indices[vboSize++] = (ni + 1) + nj * nx;
ni++;
}
nj++;
}
glBufferData(GL_ELEMENT_ARRAY_BUFFER, vboSize * 4, indices, GL_STATIC_DRAW);
delete[] indices;
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
// ----------------------------------------------------------------------------
// WAVES SPECTRUM GENERATION
// ----------------------------------------------------------------------------
long lrandom(long *seed)
{
*seed = (*seed * 1103515245 + 12345) & 0x7FFFFFFF;
return *seed;
}
float frandom(long *seed)
{
long r = lrandom(seed) >> (31 - 24);
return r / (float)(1 << 24);
}
inline float grandom(float mean, float stdDeviation, long *seed)
{
float x1, x2, w, y1;
static float y2;
static int use_last = 0;
if (use_last)
{
y1 = y2;
use_last = 0;
}
else
{
do
{
x1 = 2.0f * frandom(seed) - 1.0f;
x2 = 2.0f * frandom(seed) - 1.0f;
w = x1 * x1 + x2 * x2;
}
while (w >= 1.0f);
w = sqrt((-2.0f * log(w)) / w);
y1 = x1 * w;
y2 = x2 * w;
use_last = 1;
}
return mean + y1 * stdDeviation;
}
void getSpectrumSample(int i, int j, float lengthScale, float kMin, float *result)
{
static long seed = 1234;
float dk = 2.0 * M_PI / lengthScale;
float kx = i * dk;
float ky = j * dk;
if (abs(kx) < kMin && abs(ky) < kMin)
{
result[0] = 0.0;
result[1] = 0.0;
}
else
{
float S = spectrum(kx, ky);
float h = sqrt(S / 2.0) * dk;
float phi = frandom(&seed) * 2.0 * M_PI;
result[0] = h * cos(phi);
result[1] = h * sin(phi);
}
}
// generates the waves spectrum
void generateWavesSpectrum()
{
if (spectrum12 != NULL)
{
delete[] spectrum12;
delete[] spectrum34;
}
spectrum12 = new float[FFT_SIZE * FFT_SIZE * 4];
spectrum34 = new float[FFT_SIZE * FFT_SIZE * 4];
for (int y = 0; y < FFT_SIZE; ++y)
{
for (int x = 0; x < FFT_SIZE; ++x)
{
int offset = 4 * (x + y * FFT_SIZE);
int i = x >= FFT_SIZE / 2 ? x - FFT_SIZE : x;
int j = y >= FFT_SIZE / 2 ? y - FFT_SIZE : y;
getSpectrumSample(i, j, GRID1_SIZE, M_PI / GRID1_SIZE, spectrum12 + offset);
getSpectrumSample(i, j, GRID2_SIZE, M_PI * FFT_SIZE / GRID1_SIZE, spectrum12 + offset + 2);
getSpectrumSample(i, j, GRID3_SIZE, M_PI * FFT_SIZE / GRID2_SIZE, spectrum34 + offset);
getSpectrumSample(i, j, GRID4_SIZE, M_PI * FFT_SIZE / GRID3_SIZE, spectrum34 + offset + 2);
}
}
glActiveTexture(GL_TEXTURE0 + TEXTURE_SPECTRUM12);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, FFT_SIZE, FFT_SIZE, 0, GL_RGBA, GL_FLOAT, spectrum12);
glActiveTexture(GL_TEXTURE0 + TEXTURE_SPECTRUM34);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, FFT_SIZE, FFT_SIZE, 0, GL_RGBA, GL_FLOAT, spectrum34);
TwDefine(" HUD color='250 200 200' ");
}
float getSlopeVariance(float kx, float ky, float *spectrumSample)
{
float kSquare = kx * kx + ky * ky;
float real = spectrumSample[0];
float img = spectrumSample[1];
float hSquare = real * real + img * img;
return kSquare * hSquare * 2.0;
}
// precomputes filtered slope variances in a 3d texture, based on the wave spectrum
void TW_CALL computeSlopeVarianceTex(void *unused)
{
// slope variance due to all waves, by integrating over the full spectrum
float theoreticSlopeVariance = 0.0;
float k = 5e-3;
while (k < 1e3)
{
float nextK = k * 1.001;
theoreticSlopeVariance += k * k * spectrum(k, 0, true) * (nextK - k);
k = nextK;
}
// slope variance due to waves, by integrating over the spectrum part
// that is covered by the four nested grids. This can give a smaller result
// than the theoretic total slope variance, because the higher frequencies
// may not be covered by the four nested grid. Hence the difference between
// the two is added as a "delta" slope variance in the "variances" shader,
// to be sure not to lose the variance due to missing wave frequencies in
// the four nested grids
float totalSlopeVariance = 0.0;
for (int y = 0; y < FFT_SIZE; ++y)
{
for (int x = 0; x < FFT_SIZE; ++x)
{
int offset = 4 * (x + y * FFT_SIZE);
float i = 2.0 * M_PI * (x >= FFT_SIZE / 2 ? x - FFT_SIZE : x);
float j = 2.0 * M_PI * (y >= FFT_SIZE / 2 ? y - FFT_SIZE : y);
totalSlopeVariance += getSlopeVariance(i / GRID1_SIZE, j / GRID1_SIZE, spectrum12 + offset);
totalSlopeVariance += getSlopeVariance(i / GRID2_SIZE, j / GRID2_SIZE, spectrum12 + offset + 2);
totalSlopeVariance += getSlopeVariance(i / GRID3_SIZE, j / GRID3_SIZE, spectrum34 + offset);
totalSlopeVariance += getSlopeVariance(i / GRID4_SIZE, j / GRID4_SIZE, spectrum34 + offset + 2);
}
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffers[FRAMEBUFFER_VARIANCES]);
glViewport(0, 0, N_SLOPE_VARIANCE, N_SLOPE_VARIANCE);
glUseProgram(programs[PROGRAM_VARIANCES]->program);
glUniform4f(glGetUniformLocation(programs[PROGRAM_VARIANCES]->program, "GRID_SIZES"), GRID1_SIZE, GRID2_SIZE, GRID3_SIZE, GRID4_SIZE);
glUniform1f(glGetUniformLocation(programs[PROGRAM_VARIANCES]->program, "slopeVarianceDelta"), theoreticSlopeVariance - totalSlopeVariance);
for (int layer = 0; layer < N_SLOPE_VARIANCE; ++layer)
{
glFramebufferTexture3DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_3D,
textures[TEXTURE_SLOPE_VARIANCE],
0,
layer);
glUniform1f(glGetUniformLocation(programs[PROGRAM_VARIANCES]->program, "c"), layer);
drawQuad();
}
TwDefine(" HUD color='200 200 200' ");
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
// ----------------------------------------------------------------------------
// WAVES GENERATION AND ANIMATION (using FFT on GPU)
// ----------------------------------------------------------------------------
int bitReverse(int i, int N)
{
int j = i;
int M = N;
int Sum = 0;
int W = 1;
M = M / 2;
while (M != 0)
{
j = (i & M) > M - 1;
Sum += j * W;
W *= 2;
M = M / 2;
}
return Sum;
}
void computeWeight(int N, int k, float &Wr, float &Wi)
{
Wr = cosl(2.0 * M_PI * k / float(N));
Wi = sinl(2.0 * M_PI * k / float(N));
}
float *computeButterflyLookupTexture()
{
float *data = new float[FFT_SIZE * PASSES * 4];
for (int i = 0; i < PASSES; i++)
{
int nBlocks = (int) powf(2.0, float(PASSES - 1 - i));
int nHInputs = (int) powf(2.0, float(i));
for (int j = 0; j < nBlocks; j++)
{
for (int k = 0; k < nHInputs; k++)
{
int i1, i2, j1, j2;
if (i == 0)
{
i1 = j * nHInputs * 2 + k;
i2 = j * nHInputs * 2 + nHInputs + k;
j1 = bitReverse(i1, FFT_SIZE);
j2 = bitReverse(i2, FFT_SIZE);
}
else
{
i1 = j * nHInputs * 2 + k;
i2 = j * nHInputs * 2 + nHInputs + k;
j1 = i1;
j2 = i2;
}
float wr, wi;
computeWeight(FFT_SIZE, k * nBlocks, wr, wi);
int offset1 = 4 * (i1 + i * FFT_SIZE);
data[offset1 + 0] = (j1 + 0.5) / FFT_SIZE;
data[offset1 + 1] = (j2 + 0.5) / FFT_SIZE;
data[offset1 + 2] = wr;
data[offset1 + 3] = wi;
int offset2 = 4 * (i2 + i * FFT_SIZE);
data[offset2 + 0] = (j1 + 0.5) / FFT_SIZE;
data[offset2 + 1] = (j2 + 0.5) / FFT_SIZE;
data[offset2 + 2] = -wr;
data[offset2 + 3] = -wi;
}
}
}
return data;
}
void simulateFFTWaves(float t)
{
// init
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffers[FRAMEBUFFER_FFT0]);
for (int i = 0; i < 8; ++i)
{
glFramebufferTextureLayerEXT( GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT + i,
textures[TEXTURE_FFT_PING],
0,
i);
}
GLenum drawBuffers[8] =
{
GL_COLOR_ATTACHMENT0_EXT,
GL_COLOR_ATTACHMENT1_EXT,
GL_COLOR_ATTACHMENT2_EXT,
GL_COLOR_ATTACHMENT3_EXT,
GL_COLOR_ATTACHMENT4_EXT,
GL_COLOR_ATTACHMENT5_EXT,
GL_COLOR_ATTACHMENT6_EXT,
GL_COLOR_ATTACHMENT7_EXT
};
glDrawBuffers(choppy ? 8 : 3, drawBuffers);
glViewport(0, 0, FFT_SIZE, FFT_SIZE);
glUseProgram(programs[PROGRAM_INIT]->program);
glUniform1f(glGetUniformLocation(programs[PROGRAM_INIT]->program, "FFT_SIZE"),FFT_SIZE);
glUniform4f(glGetUniformLocation(programs[PROGRAM_INIT]->program, "INVERSE_GRID_SIZES"),
2.0 * M_PI * FFT_SIZE / GRID1_SIZE,
2.0 * M_PI * FFT_SIZE / GRID2_SIZE,
2.0 * M_PI * FFT_SIZE / GRID3_SIZE,
2.0 * M_PI * FFT_SIZE / GRID4_SIZE);
glUniform1f(glGetUniformLocation(programs[PROGRAM_INIT]->program, "t"), t);
drawQuad();
// fft passes
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffers[FRAMEBUFFER_FFT1]);
// glClearColor(1.0,0.0,0.0,0.0);
// glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(programs[PROGRAM_FFTX]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTX]->program, "nLayers"), choppy ? 8 : 3);
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTX]->program, "sLayer"), 0);
for (int i = 0; i < PASSES; ++i)
{
glUniform1f(glGetUniformLocation(programs[PROGRAM_FFTX]->program, "pass"), float(i + 0.5) / PASSES);
if (i%2 == 0)
{
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTX]->program, "imgSampler"), TEXTURE_FFT_PING);
glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
}
else
{
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTX]->program, "imgSampler"), TEXTURE_FFT_PONG);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
}
drawQuad();
}
glUseProgram(programs[PROGRAM_FFTY]->program);
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTY]->program, "nLayers"), choppy ? 8 : 3);
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTY]->program, "sLayer"), 0);
for (int i = PASSES; i < 2 * PASSES; ++i)
{
glUniform1f(glGetUniformLocation(programs[PROGRAM_FFTY]->program, "pass"), float(i - PASSES + 0.5) / PASSES);
if (i%2 == 0)
{
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTY]->program, "imgSampler"), TEXTURE_FFT_PING);
glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
}
else
{
glUniform1i(glGetUniformLocation(programs[PROGRAM_FFTY]->program, "imgSampler"), TEXTURE_FFT_PONG);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
}
drawQuad();
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
void TW_CALL getFloat(void *value, void *clientData)
{
*((float*) value) = *((float*) clientData);
}
void TW_CALL setFloat(const void *value, void *clientData)
{
*((float*) clientData) = *((float*) value);
generateWavesSpectrum();
loadStats=true;
}
void TW_CALL getInt(void *value, void *clientData)
{
*((int*) value) = *((int*) clientData);
}
void TW_CALL setInt(const void *value, void *clientData)
{
*((int*) clientData) = *((int*) value);
generateWavesSpectrum();
}
void TW_CALL getBool(void *value, void *clientData)
{
*((bool*) value) = *((bool*) clientData);
}
void TW_CALL setBool(const void *value, void *clientData)
{
*((bool*) clientData) = *((bool*) value);
loadPrograms(clientData == &cloudLayer);
}
void TW_CALL setPropagate(const void *value, void *clientData)
{
*((bool*) clientData) = *((bool*) value);
generateWavesSpectrum();
}
void TW_CALL setReload(const void *value, void *clientData)
{
if(loadStats) {
computeSlopeVarianceTex(NULL);
loadStats = false;
}
}
// ----------------------------------------------------------------------------
// scale a perspective frustum uniformly by a factor of l
void scaleFrustum(float l, float fovy, float aspect, float zNear, float zFar, const mat4f& view, mat4f& scaledView, mat4f& scaledProj)
{
// compute backward translation
float back = l / sin(fovy*M_PI/360.0);
// compute new projection attributes
float near2 = zNear - l + back;
float far2 = zFar + l + back;
scaledProj = mat4f::perspectiveProjection(fovy, aspect, near2, far2);
mat4f translate = mat4f( 1.0f, 0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, -back,
0.0f, 0.0f, 0.0f, 1.0f );
scaledView = translate * view; // row major transform
// cout << "near/far : "<< near2 << " " << far2 << endl;
}
void save(int id)
{
char buf[256];
sprintf(buf, "data/scene%d.dat", id);
std::ofstream out;
out.open(buf);
out << cloudLayer << std::endl;
out << octaves << std::endl;
out << lacunarity << std::endl;
out << gain << std::endl;
out << norm << std::endl;
out << clamp1 << std::endl;
out << clamp2 << std::endl;
out << cloudColor[0] << std::endl;
out << cloudColor[1] << std::endl;
out << cloudColor[2] << std::endl;
out << cloudColor[3] << std::endl;
out << sunTheta << std::endl;
out << sunPhi << std::endl;
out << camera::z << std::endl;
out << camera::theta << std::endl;
out << camera::phi << std::endl;
out << gridSize << std::endl;
out << seaColor[0] << std::endl;
out << seaColor[1] << std::endl;
out << seaColor[2] << std::endl;
out << seaColor[3] << std::endl;
out << hdrExposure << std::endl;
out << grid << std::endl;
out << animate << std::endl;
out << seaContrib << std::endl;
out << sunContrib << std::endl;
out << skyContrib << std::endl;
out << foamContrib << std::endl;
out << manualFilter << std::endl;
out << choppy << std::endl;
out << GRID1_SIZE << std::endl;
out << GRID2_SIZE << std::endl;
out << GRID3_SIZE << std::endl;
out << GRID4_SIZE << std::endl;
out << WIND << std::endl;
out << OMEGA << std::endl;
out << propagate << std::endl;
out << A << std::endl;
out << choppy_factor0 << std::endl;
out << choppy_factor1 << std::endl;
out << choppy_factor2 << std::endl;
out << choppy_factor3 << std::endl;
out << jacobian_scale << std::endl;
out.close();
}
void load(int id)
{
char buf[256];
sprintf(buf, "data/scene%d.dat", id);
std::ifstream in;
in.open(buf);
in >> cloudLayer;
in >> octaves;
in >> lacunarity;
in >> gain;
in >> norm;
in >> clamp1;
in >> clamp2;
in >> cloudColor[0];
in >> cloudColor[1];
in >> cloudColor[2];
in >> cloudColor[3];
in >> sunTheta;
in >> sunPhi;
in >> camera::z;
in >> camera::theta;
in >> camera::phi;
in >> gridSize;
in >> seaColor[0];
in >> seaColor[1];
in >> seaColor[2];
in >> seaColor[3];
in >> hdrExposure;
in >> grid;