void CGrassDrawer::DrawBillboard(const int x, const int y, const float dist, VA_TYPE_TN* va_tn)
{
UnsyncedRNG rng; // need our own, cause this function may run threaded
rng.Seed(y * mapDims.mapx / grassSquareSize + x);
const float rdist = 1.0f + rng.RandFloat() * 0.5f;
float alpha = 1.0f - linearstep(maxGrassDist, maxGrassDist + 127.f, dist + 128.f);
alpha = std::min(alpha, linearstep(maxDetailedDist, maxDetailedDist + 128.f * rdist, dist));
for (int a = 0; a < numTurfs; a++) {
const STurfParams p = GetTurfParams(rng, x, y);
float3 pos(p.x, CGround::GetHeightReal(p.x, p.y, false), p.y);
pos.y -= CGround::GetSlope(p.x, p.y, false) * 30.0f;
va_tn[a * 4 + 0] = { pos, 0.0f, 1.0f, float3(-partTurfSize, -partTurfSize, alpha) };
va_tn[a * 4 + 1] = { pos, 1.0f / 16.0f, 1.0f, float3( partTurfSize, -partTurfSize, alpha) };
va_tn[a * 4 + 2] = { pos, 1.0f / 16.0f, 0.0f, float3( partTurfSize, partTurfSize, alpha) };
va_tn[a * 4 + 3] = { pos, 0.0f, 0.0f, float3(-partTurfSize, partTurfSize, alpha) };
}
}
void CGrassDrawer::DrawBillboard(const int x, const int y, const float dist, VA_TYPE_TN* va_tn)
{
GrassRNG trng; // need our own, this function may run threaded
trng.Seed(y * mapDims.mapx / grassSquareSize + x);
const float rDist = 1.0f + trng.NextFloat() * 0.5f;
const float gStep = linearstep(maxGrassDist, maxGrassDist + 127.0f, dist + 128.0f);
const float dStep = linearstep(maxDetailedDist, maxDetailedDist + 128.0f * rDist, dist);
const float alpha = std::min(1.0f - gStep, dStep);
for (int a = 0; a < numTurfs; a++) {
const float3& p = GetTurfParams(trng, x, y);
const float3 pos(p.x, CGround::GetHeightReal(p.x, p.y, false) - CGround::GetSlope(p.x, p.y, false) * 30.0f, p.y);
va_tn[a * 4 + 0] = { pos, 0.0f, 1.0f, float3(-partTurfSize, -partTurfSize, alpha) };
va_tn[a * 4 + 1] = { pos, 1.0f / 16.0f, 1.0f, float3( partTurfSize, -partTurfSize, alpha) };
va_tn[a * 4 + 2] = { pos, 1.0f / 16.0f, 0.0f, float3( partTurfSize, partTurfSize, alpha) };
va_tn[a * 4 + 3] = { pos, 0.0f, 0.0f, float3(-partTurfSize, partTurfSize, alpha) };
}
}
void CGrassDrawer::DrawNear(const std::vector<InviewNearGrass>& inviewGrass)
{
for (const InviewNearGrass& g: inviewGrass) {
rng.Seed(g.y * mapDims.mapx / grassSquareSize + g.x);
// const float distSq = GetCamDistOfGrassBlock(g.x, g.y, true);
const float rdist = 1.0f + rng.RandFloat() * 0.5f;
const float alpha = linearstep(maxDetailedDist, maxDetailedDist + 128.f * rdist, g.dist);
for (int a = 0; a < numTurfs; a++) {
const STurfParams& p = GetTurfParams(rng, g.x, g.y);
float3 pos(p.x, CGround::GetHeightReal(p.x, p.y, false), p.y);
pos.y -= CGround::GetSlope(p.x, p.y, false) * 30.0f;
pos.y -= 2.0f * mapInfo->grass.bladeHeight * alpha;
glPushMatrix();
glTranslatef3(pos);
glRotatef(p.rotation, 0.0f, 1.0f, 0.0f);
glCallList(grassDL);
glPopMatrix();
}
}
}
