double AirDensity(double altitude) {
if (altitude>44330) {
altitude=44330;
}
if (altitude<-200) { // min altitude
TESTBENCH_DO_ONLY(10,StartupStore(_T(".... INVALID ALTITUDE in AirDensity: %f%s"),altitude,NEWLINE));
altitude=-200;
}
double rho = pow((44330.8-altitude)/42266.5,1.0/0.234969);
BUGSTOP_LKASSERT(rho>0);
if (rho<=0) rho=1; // we always give some pressure for the boys
return rho;
}
TerrainRenderer(const RECT& rc) : _dirty(true), _ready(), sbuf(), hBuf(), colorBuf() {
#if (WINDOWSPC>0) && TESTBENCH
StartupStore(_T(".... Init TerrainRenderer area (%ld,%ld) (%ld,%ld)\n"), rc.left, rc.top, rc.right, rc.bottom);
#endif
static bool error = false;
// This will not disable terrain! So we shall get calling here again, but no problem.
if (rc.right < 1 || rc.bottom < 1) {
if(!error) {
// log error only once
StartupStore(_T(". CRITICAL PROBLEM, cannot render terrain. rcright=%d rcbottom=%d%s"),rc.right,rc.bottom,NEWLINE);
}
error = true;
LKASSERT(0); // THIS WILL NOT POP UP A DIALOG ERROR!
return;
}
error = false;
extern unsigned int TerrainQuantization();
dtquant = TerrainQuantization();
LKASSERT(dtquant>=1);
#ifdef USE_TERRAIN_BLUR
blursize = max((unsigned int) 0, (dtquant - 1) / 2); // always 0
oversampling = max(1, (blursize + 1) / 2 + 1); // always 1
if (blursize == 0) {
oversampling = 1; // no point in oversampling, just let stretchblt do the scaling
}
#endif
/*
dtq ovs blur res_x res_y sx sy terrain_loads pixels
1 1 0 320 240 320 240 76800 76800
2 1 0 160 120 160 120 19200 19200
3 2 1 213 160 107 80 8560 34080
4 2 1 160 120 80 60 4800 19200
5 3 2 192 144 64 48 3072 27648
*/
const int res_x = iround((rc.right - rc.left) * oversampling / dtquant);
const int res_y = iround((rc.bottom - rc.top) * oversampling / dtquant);
sbuf = new (std::nothrow) CSTScreenBuffer(res_x, res_y);
if(!sbuf) {
OutOfMemory(_T(__FILE__), __LINE__);
ToggleMultimapTerrain();
return;
}
ixs = sbuf->GetCorrectedWidth() / oversampling;
iys = sbuf->GetHeight() / oversampling;
TESTBENCH_DO_ONLY(5,StartupStore(_T("... Terrain quant=%d ixs=%d iys=%d TOTAL=%d\n"),dtquant,ixs,iys,ixs*iys));
hBuf = (unsigned short*) malloc(sizeof (unsigned short)*ixs * iys);
if (!hBuf) {
StartupStore(_T("------ TerrainRenderer: malloc(%u) failed!%s"), (unsigned)(sizeof(unsigned short)*ixs*iys), NEWLINE);
OutOfMemory(_T(__FILE__), __LINE__);
//
// We *must* disable terrain at this point.
//
ToggleMultimapTerrain();
return;
}
#if TESTBENCH
else {
StartupStore(_T(". TerrainRenderer: malloc(%u) ok"), (unsigned)(sizeof(unsigned short)*ixs*iys));
}
#endif
colorBuf = (BGRColor*) malloc(256 * 128 * sizeof (BGRColor));
if (colorBuf == NULL) {
OutOfMemory(_T(__FILE__), __LINE__);
ToggleMultimapTerrain();
return;
}
// Reset this, so ColorTable will reload colors
lastColorRamp = NULL;
// this is validating terrain construction
_ready = true;
}