void GenericSolver::buildInteractionMatrix(ReactiveSet& R) {
if(verbose) printf("Building interaction matrix for %i DF...\n", R.nDF());
ProgressBar pb = ProgressBar(R.nDF(),1,verbose);
#ifdef WITH_LAPACKE
the_ixn = mmat(R.nDF(),R.nDF());
#else
the_GF = gsl_matrix_alloc(R.nDF(),R.nDF());
#endif
R.startInteractionScan();
for(unsigned int DF=0; DF<R.nDF(); DF++) {
R.setInteractionDF(DF,1.0);
for(unsigned int phi=0; phi<R.nPhi; phi++) {
mvec v = R.getReactionTo(&R,phi);
assert(v.size() == R.nDF()/R.nPhi);
for(unsigned int i=0; i<v.size(); i++)
#ifdef WITH_LAPACKE
the_ixn(i*R.nPhi+phi, DF) = v[i];
#else
gsl_matrix_set(the_GF, i*R.nPhi+phi, DF, (i*R.nPhi+phi==DF) ? 1-v[i] : -v[i]);
#endif
}
pb.update(DF);
}
R.setInteractionDF(R.nDF(),0);
}
mmat PlaneSource::fieldAtComponents(vec3 p0) const {
vec3 v = p0 - p.o;
double a = v.dot(p.sn);
double aa = a*a;
double x0 = v.dot(p.dx)/p.wx;
double x1 = x0-0.5*p.wx;
double x2 = x0+0.5*p.wx;
double y0 = v.dot(p.dz)/p.wz;
double y1 = y0-0.5*p.wz;
double y2 = y0+0.5*p.wz;
// perpendicular component
double c11 = sqrt(aa+x1*x1+y1*y1);
double c12 = sqrt(aa+x1*x1+y2*y2);
double c21 = sqrt(aa+x2*x2+y1*y1);
double c22 = sqrt(aa+x2*x2+y2*y2);
double perp1 = -1.0/(8*M_PI)*log( (x1+c12)*(x2-c22)*(x1-c11)*(x2+c21) /
((x1-c12)*(x2+c22)*(x1+c11)*(x2-c21)) );
double perp2 = 1.0/(8*M_PI)*log( (y2+c12)*(y2-c22)*(y1-c11)*(y1+c21) /
((y2-c12)*(y2+c22)*(y1+c11)*(y1-c21)) );
// parallel component
double z11 = x1*y1/(a*c11);
double z12 = x1*y2/(a*c12);
double z21 = x2*y1/(a*c21);
double z22 = x2*y2/(a*c22);
double par = 1.0/(4*M_PI)*(atan(z22)-atan(z21)+atan(z11)-atan(z12));
// filter out NANs
if(!(perp1 == perp1)) perp1 = 0;
if(!(perp2 == perp2)) perp2 = 0;
if(!(par == par)) par = 0;
vec3 xsourced = p.sn*perp1 + p.dz*par/p.wz;
vec3 zsourced = -(p.sn*perp2 - p.dx*par/p.wx);
mmat f = mmat(3,2);
for(unsigned int i=0; i<3; i++) {
f(i,0) = xsourced[i];
f(i,1) = zsourced[i];
}
return f;
}
void Display::init()
{
glewInit();
world = new World( "" );
camera = new Camera();
// assign locations
positionLocation = 0;
shadowPositionLocation = 0;
normalLocation = 1;
colorLocation = 2;
//Everybody does this
glClearColor(0.6f, 0.8f, 1.0f, 1.0f);
glEnable(GL_DEPTH_TEST);
glClearDepth(1.0);
glDepthFunc(GL_LEQUAL);
glEnable(GL_CULL_FACE);
glFrontFace(GL_CCW);
initShaders();
//Get the uniform locations for our shaders, unfortunately they can not be set by us, we have
//to ask OpenGL for them
u_modelMatrixLocation = glGetUniformLocation(shaderProgram, "u_modelMatrix");
u_projMatrixLocation = glGetUniformLocation(shaderProgram, "u_projMatrix");
u_lightPositionLocation = glGetUniformLocation(shaderProgram, "u_lightPosition");
u_lightColorLocation = glGetUniformLocation(shaderProgram, "u_lightColor");
u_camPositionLocation = glGetUniformLocation(shaderProgram, "u_camPosition");
u_shadowMapLocation = glGetUniformLocation(shaderProgram, "u_shadowMap");
u_shadowBiasMatrixLocation = glGetUniformLocation(shaderProgram, "u_shadowProjMatrix");
u_resolutionLocation = glGetUniformLocation(raymarchShaderProgram, "u_resolution");
u_rayCamPositionLocation = glGetUniformLocation(raymarchShaderProgram, "u_camPosition");
u_distanceMapLocation = glGetUniformLocation(raymarchShaderProgram, "u_distanceMap");
u_cMinLocation = glGetUniformLocation(raymarchShaderProgram, "u_cMin");
u_cMaxLocation = glGetUniformLocation(raymarchShaderProgram, "u_cMax");
u_shadowModelMatrixLocation = glGetUniformLocation(shadowShaderProgram, "u_modelMatrix");
u_shadowProjMatrixLocation = glGetUniformLocation(shadowShaderProgram, "u_projMatrix");
lightCol = vec3( 1.0f, 1.0f, 1.0f );
lightPos = vec3( -5.0f, 10.0f, 3.0f );
camera->setViewport( 640, 480 );
vec3 cpos = camera->getPos();
mat4 cmat = camera->getMat4();
mat4 mmat( 1.0f );
glUseProgram(shaderProgram);
glUniformMatrix4fv(u_modelMatrixLocation, 1, GL_FALSE, &mmat[0][0]);
glUniformMatrix4fv(u_projMatrixLocation, 1, GL_FALSE, &cmat[0][0]);
glUniform3f(u_lightPositionLocation, lightPos.x, lightPos.y, lightPos.z );
glUniform3f(u_lightColorLocation, lightCol.x, lightCol.y, lightCol.z );
glUniform3f(u_camPositionLocation, cpos.x, cpos.y, cpos.z );
glUseProgram(raymarchShaderProgram);
glUniform2i(u_resolutionLocation, camera->getWidth(), camera->getHeight() );
glUniform3f(u_rayCamPositionLocation, cpos.x, cpos.y, cpos.z );
// The framebuffer
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
// Depth texture. Slower than a depth buffer, but you can sample it later in your shader
glGenTextures(1, &depthTexture);
glBindTexture(GL_TEXTURE_2D, depthTexture);
glTexImage2D(GL_TEXTURE_2D, 0,GL_DEPTH_COMPONENT16, SHADOW_MAP_SIZE, SHADOW_MAP_SIZE,
0,GL_DEPTH_COMPONENT, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthTexture, 0);
glDrawBuffer(GL_NONE); // No color buffer is drawn to.
// Always check that our framebuffer is ok
assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, 0);
// request 1 texture name from OpenGL
glGenTextures(1, &fluidTexture);
// tell OpenGL we're going to be setting up the texture name it gave us
glBindTexture(GL_TEXTURE_3D, fluidTexture);
// when this texture needs to be shrunk to fit on small polygons, use linear interpolation of the texels to determine the color
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// when this texture needs to be magnified to fit on a big polygon, use linear interpolation of the texels to determine the color
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// we want the texture to repeat over the S axis, so if we specify coordinates out of range we still get textured.
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP);
// same as above for T axis
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP);
// same as above for R axis
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP);
}