void strafe_right() {
camera_x += fsin(camera_yrot+(90*piover180)) * 0.1f;
camera_z += fcos(camera_yrot+(90*piover180)) * 0.1f;
walkbiasangle-= 10;
walkbiasangle%=360;
walkbias=fsin(walkbiasangle * piover180)*0.25f;
}
/* draw_object just draws a single object at a fixed position, although
this can easily be modified to allow for more objects.
bmp = bitmap to draw to. obj = sprite for the object.
angle, cx, cy define the camera position.
*/
void draw_object (BITMAP *bmp, BITMAP *obj, fixed angle, fixed cx, fixed cy, MODE_7_PARAMS params)
{
int width, height;
int screen_y, screen_x;
// The object in this case is at a fixed position of (160, 100).
// Calculate the position relative to the camera.
fixed obj_x = itofix(160) - cx;
fixed obj_y = itofix(100) - cy;
// use a rotation transformation to rotate the object by the camera
// angle
fixed space_x = fmul (obj_x, fcos (angle)) + fmul (obj_y, fsin (angle));
fixed space_y = -fmul (obj_x, fsin (angle)) + fmul (obj_y, fcos (angle));
// calculate the screen coordinates that go with these space coordinates
// by dividing everything by space_x (the distance)
screen_x = bmp->w/2 + fixtoi (fmul (fdiv (params.scale_x, space_x), space_y));
screen_y = fixtoi (fdiv (fmul (params.space_z, params.scale_y), space_x)) - params.horizon;
// the size of the object has to be scaled according to the distance
height = fixtoi (obj->h * fdiv(params.obj_scale_y, space_x));
width = fixtoi (obj->w * fdiv(params.obj_scale_x, space_x));
// draw the object
stretch_sprite (bmp, obj, screen_x - width / 2, screen_y - height, width, height);
}
matrix_t * fime_ship_update(const float seconds)
{
static float ax;
static float ay;
matrix_t tmp;
float x,y,z;
vtx_t oldpos = *(vtx_t *)mtx[3];
MtxIdentity(tmp);
x = fsin(ax += 0.015f) * 1.5;
y = (fsin(ay += 0.008f) + 1) * -0.5;
z = 0; //mtx[3][2] + 0.00;
angle.z = (x - oldpos.x) * 40;
angle.x = (y - oldpos.y) * -20;
/* angle.z = angle.z < 0 ? -3.1 : 3.1; */
MtxIdentity(mtx);
MtxRotateZ(mtx, angle.z);
MtxRotateX(mtx, angle.x);
MtxRotateY(mtx, angle.y);
mtx[3][0] = x;
mtx[3][1] = y;
mtx[3][2] = z;
return &mtx;
}
void _inplace_glify(GLfloat* v)
{
hmatrix xmat;
hvector rvec;
real32 deg = -90.0f;
real32 deg2 = -90.0f;
hmatMakeRotAboutZ(&xmat, fcos(DEG_TO_RAD(deg)), fsin(DEG_TO_RAD(deg)));
hmatMultiplyHVecByHMat(&rvec, (hvector*)v, &xmat);
if (v[3] != 0.0f)
{
v[0] /= v[3];
v[1] /= v[3];
v[2] /= v[3];
}
memcpy(v, &rvec, 3*sizeof(real32));
hmatMakeRotAboutX(&xmat, fcos(DEG_TO_RAD(deg2)), fsin(DEG_TO_RAD(deg2)));
hmatMultiplyHVecByHMat(&rvec, (hvector*)v, &xmat);
if (v[3] != 0.0f)
{
v[0] /= v[3];
v[1] /= v[3];
v[2] /= v[3];
}
memcpy(v, &rvec, 3*sizeof(real32));
}
/*[0,pi/4)に簡約*/
uint32_t fsin(uint32_t f){
if(fcmp(f,0) == 0)
return fneg(fsin(f - (1 << 31)));
if(fcmp(f,0x40c90fda) == 2)
return fsin(fadd(f,0xc0c90fda));
if(fcmp(f,MYPI) == 0){
if(fcmp(f,MYPI2) == 0){
if(fcmp(f,MYPI4) == 0)
return kernel_sin(f);
else
return kernel_cos(fadd(MYPI2,fneg(f)));
}else{
if(fcmp(f,fadd(MYPI4,MYPI2)) == 0)
kernel_cos(fadd(f,fneg(MYPI2)));
else
kernel_sin(fadd(MYPI,fneg(f)));
}
}else{
f = fadd(f,fneg(MYPI));
if(fcmp(f,MYPI2) == 0){
if(fcmp(f,MYPI4) == 0)
return fneg(kernel_sin(f));
else
return fneg(kernel_cos(fadd(MYPI2,fneg(f))));
}else{
if(fcmp(f,fadd(MYPI4,MYPI2)) == 0)
fneg(kernel_cos(fadd(f,fneg(MYPI2))));
else
fneg(kernel_sin(fadd(MYPI,fneg(f))));
}
}
}
/*-----------------------------------------------------------------------------
Name : btgConvertAVert
Description : spherically unprojects a vert
Inputs : out - target output vector
x, y - 2D position
Outputs : out is modified
Return :
----------------------------------------------------------------------------*/
void btgConvertAVert(math::Vec3f* out, real64 x, real64 y)
{
real32 xFrac, yFrac;
real32 theta, phi;
real32 sinTheta, cosTheta;
real32 sinPhi, cosPhi;
real32 pageWidth, pageHeight;
real32 radius;
pageWidth = (real32)btgHead->pageWidth;
pageHeight = (real32)btgHead->pageHeight;
x = ((real64)pageWidth - 1.0) - x;
xFrac = (real32)x / pageWidth;
yFrac = (real32)y / pageHeight;
theta = 2.0f * M_PI_F * xFrac;
phi = 1.0f * M_PI_F * yFrac;
theta += math::degToRad(btgThetaOffset) + math::degToRad(90.0f);
phi += math::degToRad(btgPhiOffset);
sinTheta = fsin(theta);
cosTheta = fcos(theta);
sinPhi = fsin(phi);
cosPhi = fcos(phi);
radius = 1.0;
out->x = radius * cosTheta * sinPhi;
out->y = radius * sinTheta * sinPhi;
out->z = radius * cosPhi;
}
/*-----------------------------------------------------------------------------
Name : btgConvertAVert
Description : spherically unprojects a vert
Inputs : out - target output vector
x, y - 2D position
Outputs : out is modified
Return :
----------------------------------------------------------------------------*/
void btgConvertAVert(vector* out, real32 x, real32 y)
{
real32 xFrac, yFrac;
real32 theta, phi;
real32 sinTheta, cosTheta;
real32 sinPhi, cosPhi;
real32 pageWidth, pageHeight;
real32 radius;
pageWidth = (real32)btgHead->pageWidth;
pageHeight = (real32)btgHead->pageHeight;
x = ((real32)pageWidth - 1.0) - x;
xFrac = (real32)x / pageWidth;
yFrac = (real32)y / pageHeight;
theta = 2.0f * M_PI_F * xFrac;
phi = 1.0f * M_PI_F * yFrac;
theta += DEG_TO_RAD(btgThetaOffset) + DEG_TO_RAD(90.0f);
phi += DEG_TO_RAD(btgPhiOffset);
sinTheta = fsin(theta);
cosTheta = fcos(theta);
sinPhi = fsin(phi);
cosPhi = fcos(phi);
radius = CAMERA_CLIP_FAR - 500.0f;
out->x = radius * cosTheta * sinPhi;
out->y = radius * sinTheta * sinPhi;
out->z = radius * cosPhi;
}
void walk_backward() {
camera_x += (fsin(camera_yrot)*rad_to_deg) * 0.002f;
camera_z -= (fcos(camera_yrot)*rad_to_deg) * 0.002f;
walkbiasangle-= 10;
walkbiasangle%=360;
walkbias=fsin(walkbiasangle * piover180)*0.25f;
}
void
flat_face(float ir, float or, float wd)
{
int i;
float w;
/* draw each face (top & bottom ) * */
if (poo)
printf("Face : %f..%f wid=%f\n", ir, or, wd);
if (wd == 0.0)
return;
for (w = wd / 2; w > -wd; w -= wd) {
if (w > 0.0)
glNormal3f(0.0, 0.0, 1.0);
else
glNormal3f(0.0, 0.0, -1.0);
if (ir == 0.0) {
/* draw as t-fan */
glBegin(GL_TRIANGLE_FAN);
glVertex3f(0.0, 0.0, w); /* center */
glVertex3f(or, 0.0, w);
for (i = 1; i < circle_subdiv; i++) {
glVertex3f(fcos(2.0 * M_PI * i / circle_subdiv) * or,
fsin(2.0 * M_PI * i / circle_subdiv) * or,
w);
}
glVertex3f(or, 0.0, w);
glEnd();
} else {
/* draw as tmesh */
glBegin(GL_TRIANGLE_STRIP);
glVertex3f(or, 0.0, w);
glVertex3f(ir, 0.0, w);
for (i = 1; i < circle_subdiv; i++) {
glVertex3f(fcos(2.0 * M_PI * i / circle_subdiv) * or,
fsin(2.0 * M_PI * i / circle_subdiv) * or,
w);
glVertex3f(fcos(2.0 * M_PI * i / circle_subdiv) * ir,
fsin(2.0 * M_PI * i / circle_subdiv) * ir,
w);
}
glVertex3f(or, 0.0, w);
glVertex3f(ir, 0.0, w);
glEnd();
}
}
}
void mode_7 (BITMAP *bmp, BITMAP *tile, fixed angle, fixed cx, fixed cy, MODE_7_PARAMS params)
{
// current screen position
int screen_x, screen_y;
// the distance and horizontal scale of the line we are drawing
fixed distance, horizontal_scale;
// masks to make sure we don't read pixels outside the tile
int mask_x = (tile->w - 1);
int mask_y = (tile->h -1);
// step for points in space between two pixels on a horizontal line
fixed line_dx, line_dy;
// current space position
fixed space_x, space_y;
for (screen_y = 0; screen_y < bmp->h; screen_y++)
{
// first calculate the distance of the line we are drawing
distance = fdiv (fmul (params.space_z, params.scale_y),
itofix (screen_y + params.horizon));
// then calculate the horizontal scale, or the distance between
// space points on this horizontal line
horizontal_scale = fdiv (distance, params.scale_x);
// calculate the dx and dy of points in space when we step
// through all points on this line
line_dx = fmul (-fsin(angle), horizontal_scale);
line_dy = fmul (fcos(angle), horizontal_scale);
// calculate the starting position
space_x = cx + fmul (distance, fcos(angle)) - bmp->w/2 * line_dx;
space_y = cy + fmul (distance, fsin(angle)) - bmp->w/2 * line_dy;
// go through all points in this screen line
for (screen_x = 0; screen_x < bmp->w; screen_x++)
{
// get a pixel from the tile and put it on the screen
putpixel (bmp, screen_x, screen_y,
getpixel (tile,
fixtoi (space_x) & mask_x,
fixtoi (space_y) & mask_y ));
// advance to the next position in space
space_x += line_dx;
space_y += line_dy;
}
}
}
void matrix4::perspective(float fovy, float aspect, float zNear, float zFar, bool infinite)
{
double radians = fovy / 2 * (3.14159265358979323846) / 180;
double cotangent = fcos(radians) / fsin(radians);
float deltaZ = zFar - zNear;
m[0] = (float)(cotangent / aspect);
m[1] = 0.0f;
m[2] = 0.0f;
m[3] = 0.0f;
m[4] = 0.0f;
m[5] = (float)cotangent;
m[6] = 0.0f;
m[7] = 0.0f;
m[8] = 0.0f;
m[9] = 0.0f;
m[10] = -(zFar + zNear) / deltaZ;
m[11] = -1.0f;
m[12] = 0.0f;
m[13] = 0.0f;
m[14] = -2 * zNear * zFar / deltaZ;
m[15] = 0.0f;
if (infinite)
{
m[10] = -1.0f;
m[14] = -2.0f;
}
}
void main()
{
init_sincos_library();
printf("sine: %f\n",fsin(M_PI));
printf("cosine: %f\n",fcos(M_PI));
close_sincos_library();
}
static void
update_IrPoints( irInfo* irs)
{
int cnt;
Point rpos;
float rrot;
float distanceToObstacle = ROB_RADIUS + IR_THRESHOLD_DIST;
updateActualPosition( &rpos, &rrot, DONT_CONSIDER_DIRECTION);
for ( cnt = 0; cnt < irs->numberOfActivatedIrs; cnt++) {
float angle = rrot + irs->angle[cnt];
Ir_Obstacle_Points.points[cnt].x =
rpos.x + (fcos( angle) * distanceToObstacle);
Ir_Obstacle_Points.points[cnt].y =
rpos.y + (fsin( angle) * distanceToObstacle);
}
if ( irs->numberOfActivatedIrs > 0)
setStartTime( IR_TIMER);
Ir_Obstacle_Points.no_of_points = irs->numberOfActivatedIrs;
}
int fcos( short alpha)
{ // cos(a ) == sin (a+90)
int i;
i = fsin( alpha + 90);
return i;
} // fcos
static int grproc_xadvance( INSTANCE * my, int * params )
{
int angle = params[0] ;
LOCINT32( mod_grproc, my, COORDX ) += fixtoi( fmul( fcos( angle ), itofix( params[1] ) ) ) ;
LOCINT32( mod_grproc, my, COORDY ) -= fixtoi( fmul( fsin( angle ), itofix( params[1] ) ) ) ;
return 1 ;
}
// create a globe with constant radius and color
void miniglobe::create_globe(float radius,const float color[3])
{
int i,j;
const int alpha_steps=4*STRIPES;
const int beta_steps=STRIPES;
float u,v;
float alpha,beta;
float nx,ny,nz;
STRIP->setcol(color[0],color[1],color[2]);
for (j=-beta_steps; j<beta_steps; j++)
{
STRIP->beginstrip();
for (i=alpha_steps; i>=0; i--)
{
u=(float)i/alpha_steps;
v=(float)j/beta_steps;
alpha=u*2*PI;
beta=v*PI/2;
nx=fcos(alpha)*fcos(beta);
nz=-fsin(alpha)*fcos(beta);
ny=fsin(beta);
STRIP->setnrm(nx,ny,nz);
STRIP->settex(u,0.5f-v/2);
STRIP->addvtx(nx*radius,ny*radius,nz*radius);
v=(float)(j+1)/beta_steps;
beta=v*PI/2;
nx=fcos(alpha)*fcos(beta);
nz=-fsin(alpha)*fcos(beta);
ny=fsin(beta);
STRIP->setnrm(nx,ny,nz);
STRIP->settex(u,0.5f-v/2);
STRIP->addvtx(nx*radius,ny*radius,nz*radius);
}
}
}
int main(int argc, char **argv) {
int done, i;
float theta, dt;
float colors[3*10] = {
0.0f, 0.5f, 1.0f,
0.0f, 1.0f, 0.0f,
1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.0f,
0.5f, 0.0f, 0.5f,
0.5f, 0.5f, 0.5f,
0.73f, 0.8f, 0.25f,
0.25f, 0.8f, 0.73f,
1.0f, 1.0f, 0.0f
};
// Init PVR
pvr_init_defaults();
// Setup the context
plx_cxt_init();
plx_cxt_texture(NULL);
plx_cxt_culling(PLX_CULL_NONE);
// Until the user hits start...
dt = 2*M_PI/160.0f;
for (done = 0, theta = 0.0f; !done; ) {
// Check for start
MAPLE_FOREACH_BEGIN(MAPLE_FUNC_CONTROLLER, cont_state_t, st)
if (st->buttons & CONT_START)
done = 1;
MAPLE_FOREACH_END()
// Setup the frame
pvr_wait_ready();
pvr_scene_begin();
pvr_list_begin(PVR_LIST_OP_POLY);
// Submit the context
plx_cxt_send(PVR_LIST_OP_POLY);
// Draw a sinus bar at our current position and several positions
// back. Each bar will get its own Z value (descending).
for (i=0; i<10; i++) {
drawbar(240.0f + fsin(theta - dt*i*6) * 120.0f, 100.0f - i,
colors[i*3+0], colors[i*3+1], colors[i*3+2]);
}
pvr_scene_finish();
// Move our counters
theta += dt;
while (theta >= 2*M_PI)
theta -= 2*M_PI;
}
return 0;
}
// readjust the settings, call this when slide dimension is changed
void PictureFlowState::reposition() {
angle = 70 * IANGLE_MAX / 360; // approx. 70 degrees tilted
offsetX = slideWidth / 2 * (PFREAL_ONE - fcos(angle));
offsetY = slideWidth / 2 * fsin(angle);
offsetX += slideWidth * PFREAL_ONE;
offsetY += slideWidth * PFREAL_ONE / 4;
spacing = 40;
}
ComputeSHShader()
{
std::ifstream fsin("../examples/shaders/computesh.comp", std::ios::in);
const std::string &fs = std::string((std::istreambuf_iterator<char>(fsin)), std::istreambuf_iterator<char>());
Program = ProgramShaderLoading::LoadProgram(
GL_COMPUTE_SHADER, fs.c_str());
AssignSamplerNames(Program, "DATA", "probe");
GLuint SHblock = glGetProgramResourceIndex(Program, GL_SHADER_STORAGE_BLOCK, "SH");
glShaderStorageBlockBinding(Program, SHblock, 0);
}
void sphere(float s, float t, float *x, float *y, float *z, float *nx, float *ny, float *nz)
{
float r;
float RGV;
*y = sin((t-0.5)*PI) * (maxy-miny)/2.0 + (maxy+miny)/2 + 0.5;
r = cos((t-0.5)*PI);
*x = r * sin(s*2*PI) * (maxx-minx)/2.0 + (maxx+minx)/2 + 0.5;
*z = r * cos(s*2*PI) * (maxz-minz)/2.0 + (maxz+minz)/2 + 0.5;
*nx = fsin(3.0 * 2.0 * PI * s) * 127.0 + 127.0;
*ny = fsin(3.0 * 2.0 * PI * t) * 127.0 + 127.0;
RGV = (*nx/255.0) * (*nx/255.0) + (*ny/255.0) * (*ny/255.0);
if (RGV < 0.25)
*nz = 255.0 - (*nx/255.0) * (*nx/255.0) - (*ny/255.0) * (*ny/255.0);
else
*nz = 0;
}
static date_type local_dst_end_day(year_type year)
{
if (year >= year_type(2007)) {
//first sunday in november
fkday fsin(Sunday, gregorian::Nov);
return fsin.get_date(year);
} else {
//last sunday in october
lkday lsio(Sunday, gregorian::Oct);
return lsio.get_date(year);
}
}
void alienrocket::update(){
if(fired){
// rocket moves towards destination:
if((fixtoi(x) > 0) && (fixtoi(x) < 800) && (fixtoi(y) < 600) && (fixtoi(y) > 0)){
x += speed * fcos (angle);
y += speed * fsin (angle);
}else{ fired = false; }
//angle = (angle + angle_stepsize) & 0xFFFFFF;
//if we hit the player
if (abs (x - targetX) + abs (y - targetY) < itofix(50)){ hit = true; fired = false; }
}
}
int main(void) {
GHandle gh;
uint16_t i;
gfxInit();
{
GWindowInit wi;
gwinClearInit(&wi);
wi.show = TRUE;
wi.x = wi.y = 0;
wi.width = gdispGetWidth();
wi.height = gdispGetHeight();
gh = gwinGraphCreate(&g, &wi);
}
gwinGraphSetOrigin(gh, gwinGetWidth(gh)/2, gwinGetHeight(gh)/2);
gwinGraphSetStyle(gh, &GraphStyle1);
gwinGraphDrawAxis(gh);
for(i = 0; i < gwinGetWidth(gh); i++)
gwinGraphDrawPoint(gh, i-gwinGetWidth(gh)/2, 80*fsin(2*i/5)); //sin(2*0.2*M_PI*i/180));
gwinGraphStartSet(gh);
GraphStyle1.point.color = uGreen;
gwinGraphSetStyle(gh, &GraphStyle1);
for(i = 0; i < gwinGetWidth(gh)*5; i++)
gwinGraphDrawPoint(gh, i/5-gwinGetWidth(gh)/2, 95*fsin(2*i/5)); //sin(2*0.2*M_PI*i/180));
gwinGraphStartSet(gh);
gwinGraphSetStyle(gh, &GraphStyle2);
gwinGraphDrawPoints(gh, data, sizeof(data)/sizeof(data[0]));
while(TRUE) {
gfxSleepMilliseconds(100);
}
}
Tonemap()
{
std::ifstream vsin("../examples/shaders/screenquad.vert", std::ios::in);
const std::string &vs = std::string((std::istreambuf_iterator<char>(vsin)), std::istreambuf_iterator<char>());
std::ifstream fsin("../examples/shaders/tonemap.frag", std::ios::in);
const std::string &fs = std::string((std::istreambuf_iterator<char>(fsin)), std::istreambuf_iterator<char>());
Program = ProgramShaderLoading::LoadProgram(
GL_VERTEX_SHADER, vs.c_str(),
GL_FRAGMENT_SHADER, fs.c_str());
AssignSamplerNames(Program, "tex");
}
IBLShader()
{
std::ifstream vsin("../examples/shaders/screenquad.vert", std::ios::in);
const std::string &vs = std::string((std::istreambuf_iterator<char>(vsin)), std::istreambuf_iterator<char>());
std::ifstream fsin("../examples/shaders/ibl.frag", std::ios::in);
const std::string &fs = std::string((std::istreambuf_iterator<char>(fsin)), std::istreambuf_iterator<char>());
Program = ProgramShaderLoading::LoadProgram(
GL_VERTEX_SHADER, vs.c_str(),
GL_FRAGMENT_SHADER, fs.c_str());
AssignSamplerNames(Program, "VIEWDATA", "IBLDATA", "ntex", "ctex", "dtex", "probe", "dfg");
}
ImportanceSamplingForSpecularCubemap()
{
std::ifstream vsin("../examples/shaders/screenquad.vert", std::ios::in);
const std::string &vs = std::string((std::istreambuf_iterator<char>(vsin)), std::istreambuf_iterator<char>());
std::ifstream fsin("../examples/shaders/importance_sampling_specular.frag", std::ios::in);
const std::string &fs = std::string((std::istreambuf_iterator<char>(fsin)), std::istreambuf_iterator<char>());
Program = ProgramShaderLoading::LoadProgram(
GL_VERTEX_SHADER, vs.c_str(),
GL_FRAGMENT_SHADER, fs.c_str());
AssignSamplerNames(Program, "Matrix", "tex", "samples");
}
Skybox()
{
std::ifstream vsin("../examples/shaders/skybox.vert", std::ios::in);
const std::string &vs = std::string((std::istreambuf_iterator<char>(vsin)), std::istreambuf_iterator<char>());
std::ifstream fsin("../examples/shaders/skybox.frag", std::ios::in);
const std::string &fs = std::string((std::istreambuf_iterator<char>(fsin)), std::istreambuf_iterator<char>());
Program = ProgramShaderLoading::LoadProgram(
GL_VERTEX_SHADER, vs.c_str(),
GL_FRAGMENT_SHADER, fs.c_str());
AssignSamplerNames(Program, "Matrixes", "skytexture");
}
// T and Q defines the light source as polar coordinates where
// T is the elevation angle ranging from 0 to Pi/2 (90 degrees) and
// Q is the rotation angle ranging from 0 to Pi*2 (360 degrees).
// h is an intensity value specifying how much bumping should be done. 0 <= h <= 1
void
set_bump_direction (float T, float Q, float h)
{
unsigned char Q2 = (unsigned char) ((Q / (2 * 3.1415927))* 255);
unsigned char h2 = (unsigned char) (h * 255);
unsigned char k1 = 255 - h2;
unsigned char k2 = (unsigned char) (h2 * fsin(T));
unsigned char k3 = (unsigned char) (h2 * fcos(T));
/* The bump direction is encoded as an offset colour. */
glKosOffsetColor4ub (k2, k3, Q2, k1);
}
ObjectShader()
{
std::ifstream vsin("../examples/shaders/object.vert", std::ios::in);
const std::string &vs = std::string((std::istreambuf_iterator<char>(vsin)), std::istreambuf_iterator<char>());
std::ifstream fsin("../examples/shaders/object_gbuffer.frag", std::ios::in);
const std::string &fs = std::string((std::istreambuf_iterator<char>(fsin)), std::istreambuf_iterator<char>());
Program = ProgramShaderLoading::LoadProgram(
GL_VERTEX_SHADER, vs.c_str(),
GL_FRAGMENT_SHADER, fs.c_str());
AssignSamplerNames(Program, "ViewMatrices", "ObjectData", "tex");
}
// readjust the settings, call this when slide dimension is changed
void PictureFlowState::reposition()
{
// angle = 70 * IANGLE_MAX / 360; // approx. 70 degrees tilted
angle = rawAngle * IANGLE_MAX / 360;
offsetX = slideWidth/2 * (PFREAL_ONE-fcos(angle));
offsetY = slideWidth/2 * fsin(angle);
offsetX += slideWidth * PFREAL_ONE;
offsetY += slideWidth * PFREAL_ONE / 3;
if(rawAngle < 45)
offsetX += offsetX/4;
if(angle>0)
spacing = slideWidth * 0.35;
else
spacing = slideWidth*spacingRatio + slideWidth*(spacingRatio?0.10:0.2);
}