void CGrassDrawer::ChangeDetail(int detail) {
// TODO: get rid of the magic constants
const int detail_lim = std::min(3, detail);
maxGrassDist = 800 + std::sqrt((float) detail) * 240;
maxDetailedDist = 146 + detail * 24;
detailedBlocks = int((maxDetailedDist + 128.f * 1.5f) / bMSsq) + 1;
numTurfs = 3 + int(detail_lim * 0.5f);
strawPerTurf = std::min(50 + int(std::sqrt((float)detail_lim) * 10), mapInfo->grass.maxStrawsPerTurf);
// recreate textures & XBOs
CreateGrassDispList(grassDL);
CreateFarTex();
// reset all cached blocks
for (GrassStruct& pGS: grass) {
ResetPos(pGS.posX, pGS.posZ);
}
}
CGrassDrawer::CGrassDrawer()
: grassOff(false)
, grassDL(0)
, grassBladeTex(0)
, farTex(0)
, grassMap(nullptr)
{
const int detail = configHandler->GetInt("GrassDetail");
// some ATI drivers crash with grass enabled, default to disabled
if ((detail == 0) || ((detail == 7) && globalRendering->haveATI)) {
grassOff = true;
return;
}
if (!GLEW_EXT_framebuffer_blit) {
grassOff = true;
return;
}
{
MapBitmapInfo grassbm;
unsigned char* grassdata = readMap->GetInfoMap("grass", &grassbm);
if (!grassdata) {
grassOff = true;
return;
}
if (grassbm.width != gs->mapx / grassSquareSize || grassbm.height != gs->mapy / grassSquareSize) {
char b[128];
SNPRINTF(b, sizeof(b), "grass-map has wrong size (%dx%d, should be %dx%d)\n",
grassbm.width, grassbm.height, gs->mapx / 4, gs->mapy / 4);
throw std::runtime_error(b);
}
const int grassMapSize = gs->mapx * gs->mapy / (grassSquareSize * grassSquareSize);
grassMap = new unsigned char[grassMapSize];
memcpy(grassMap, grassdata, grassMapSize);
readMap->FreeInfoMap("grass", grassdata);
}
ChangeDetail(detail);
blocksX = gs->mapx / grassSquareSize / grassBlockSize;
blocksY = gs->mapy / grassSquareSize / grassBlockSize;
rng.Seed(15);
grassDL = glGenLists(1);
CreateGrassDispList(grassDL);
{
CBitmap grassBladeTexBM;
if (!grassBladeTexBM.Load(mapInfo->grass.grassBladeTexName)) {
//! map didn't define a grasstex, so generate one
grassBladeTexBM.channels = 4;
grassBladeTexBM.Alloc(256,64);
for (int a = 0; a < 16; ++a) {
CreateGrassBladeTex(&grassBladeTexBM.mem[a * 16 * 4]);
}
}
glGenTextures(1, &grassBladeTex);
glBindTexture(GL_TEXTURE_2D, grassBladeTex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glBuildMipmaps(GL_TEXTURE_2D, GL_RGBA8, grassBladeTexBM.xsize, grassBladeTexBM.ysize, GL_RGBA, GL_UNSIGNED_BYTE, &grassBladeTexBM.mem[0]);
}
CreateFarTex();
LoadGrassShaders();
configHandler->NotifyOnChange(this);
}