///////////////////////////////////////////////////////////////////
// Calculate The blurred normal map to get an idea of where water ought to go.
void WaterManager::RecomputeBlurredNormalMap()
{
// used to cache terrain normals since otherwise we'd recalculate them a lot (I'm blurring the "normal" map).
// this might be updated to actually cache in the terrain manager but that's not for now.
if (m_BlurredNormalMap == NULL)
m_BlurredNormalMap = new CVector3D[m_MapSize*m_MapSize];
CTerrain* terrain = g_Game->GetWorld()->GetTerrain();
// It's really slow to calculate normals so cache them first.
CVector3D* normals = new CVector3D[m_MapSize*m_MapSize];
// Not the edges, we won't care about them.
float ii = 8.0f, jj = 8.0f;
for (size_t j = 2; j < m_MapSize-2; ++j, jj += 4.0f)
for (size_t i = 2; i < m_MapSize-2; ++i, ii += 4.0f)
{
CVector3D norm;
terrain->CalcNormal(i,j,norm);
normals[j*m_MapSize + i] = norm;
}
// We could be way fancier (and faster) for our blur but we probably don't need the complexity.
// Two pass filter, nothing complicated here.
CVector3D blurValue;
ii = 8.0f; jj = 8.0f;
size_t idx = 2;
for (size_t j = 2; j < m_MapSize-2; ++j, jj += 4.0f)
for (size_t i = 2; i < m_MapSize-2; ++i, ii += 4.0f,++idx)
{
blurValue = normals[idx-2];
blurValue += normals[idx-1];
blurValue += normals[idx];
blurValue += normals[idx+1];
blurValue += normals[idx+2];
m_BlurredNormalMap[idx] = blurValue * 0.2f;
}
// y direction, probably slower because of cache misses but I don't see an easy way around that.
ii = 8.0f; jj = 8.0f;
for (size_t i = 2; i < m_MapSize-2; ++i, ii += 4.0f)
{
for (size_t j = 2; j < m_MapSize-2; ++j, jj += 4.0f)
{
blurValue = normals[(j-2)*m_MapSize + i];
blurValue += normals[(j-1)*m_MapSize + i];
blurValue += normals[j*m_MapSize + i];
blurValue += normals[(j+1)*m_MapSize + i];
blurValue += normals[(j+2)*m_MapSize + i];
m_BlurredNormalMap[j*m_MapSize + i] = blurValue * 0.2f;
}
}
delete[] normals;
}
void CPatchRData::AddBlend(std::vector<SBlendVertex>& blendVertices, std::vector<u16>& blendIndices,
u16 i, u16 j, u8 shape, CTerrainTextureEntry* texture)
{
CTerrain* terrain = m_Patch->m_Parent;
ssize_t gx = m_Patch->m_X * PATCH_SIZE + i;
ssize_t gz = m_Patch->m_Z * PATCH_SIZE + j;
// uses the current neighbour texture
BlendShape8 shape8;
for (size_t m = 0; m < 8; ++m)
shape8[m] = (shape & (1 << m)) ? 0 : 1;
// calculate the required alphamap and the required rotation of the alphamap from blendshape
unsigned int alphamapflags;
int alphamap = CAlphaMapCalculator::Calculate(shape8, alphamapflags);
// now actually render the blend tile (if we need one)
if (alphamap == -1)
return;
float u0 = texture->m_TerrainAlpha->second.m_AlphaMapCoords[alphamap].u0;
float u1 = texture->m_TerrainAlpha->second.m_AlphaMapCoords[alphamap].u1;
float v0 = texture->m_TerrainAlpha->second.m_AlphaMapCoords[alphamap].v0;
float v1 = texture->m_TerrainAlpha->second.m_AlphaMapCoords[alphamap].v1;
if (alphamapflags & BLENDMAP_FLIPU)
std::swap(u0, u1);
if (alphamapflags & BLENDMAP_FLIPV)
std::swap(v0, v1);
int base = 0;
if (alphamapflags & BLENDMAP_ROTATE90)
base = 1;
else if (alphamapflags & BLENDMAP_ROTATE180)
base = 2;
else if (alphamapflags & BLENDMAP_ROTATE270)
base = 3;
SBlendVertex vtx[4];
vtx[(base + 0) % 4].m_AlphaUVs[0] = u0;
vtx[(base + 0) % 4].m_AlphaUVs[1] = v0;
vtx[(base + 1) % 4].m_AlphaUVs[0] = u1;
vtx[(base + 1) % 4].m_AlphaUVs[1] = v0;
vtx[(base + 2) % 4].m_AlphaUVs[0] = u1;
vtx[(base + 2) % 4].m_AlphaUVs[1] = v1;
vtx[(base + 3) % 4].m_AlphaUVs[0] = u0;
vtx[(base + 3) % 4].m_AlphaUVs[1] = v1;
SBlendVertex dst;
const CLightEnv& lightEnv = g_Renderer.GetLightEnv();
CVector3D normal;
bool cpuLighting = (g_Renderer.GetRenderPath() == CRenderer::RP_FIXED);
size_t index = blendVertices.size();
terrain->CalcPosition(gx, gz, dst.m_Position);
terrain->CalcNormal(gx, gz, normal);
dst.m_Normal = normal;
dst.m_DiffuseColor = cpuLighting ? lightEnv.EvaluateTerrainDiffuseScaled(normal) : lightEnv.EvaluateTerrainDiffuseFactor(normal);
dst.m_AlphaUVs[0] = vtx[0].m_AlphaUVs[0];
dst.m_AlphaUVs[1] = vtx[0].m_AlphaUVs[1];
blendVertices.push_back(dst);
terrain->CalcPosition(gx + 1, gz, dst.m_Position);
terrain->CalcNormal(gx + 1, gz, normal);
dst.m_Normal = normal;
dst.m_DiffuseColor = cpuLighting ? lightEnv.EvaluateTerrainDiffuseScaled(normal) : lightEnv.EvaluateTerrainDiffuseFactor(normal);
dst.m_AlphaUVs[0] = vtx[1].m_AlphaUVs[0];
dst.m_AlphaUVs[1] = vtx[1].m_AlphaUVs[1];
blendVertices.push_back(dst);
terrain->CalcPosition(gx + 1, gz + 1, dst.m_Position);
terrain->CalcNormal(gx + 1, gz + 1, normal);
dst.m_Normal = normal;
dst.m_DiffuseColor = cpuLighting ? lightEnv.EvaluateTerrainDiffuseScaled(normal) : lightEnv.EvaluateTerrainDiffuseFactor(normal);
dst.m_AlphaUVs[0] = vtx[2].m_AlphaUVs[0];
dst.m_AlphaUVs[1] = vtx[2].m_AlphaUVs[1];
blendVertices.push_back(dst);
terrain->CalcPosition(gx, gz + 1, dst.m_Position);
terrain->CalcNormal(gx, gz + 1, normal);
dst.m_Normal = normal;
dst.m_DiffuseColor = cpuLighting ? lightEnv.EvaluateTerrainDiffuseScaled(normal) : lightEnv.EvaluateTerrainDiffuseFactor(normal);
dst.m_AlphaUVs[0] = vtx[3].m_AlphaUVs[0];
dst.m_AlphaUVs[1] = vtx[3].m_AlphaUVs[1];
blendVertices.push_back(dst);
bool dir = terrain->GetTriangulationDir(gx, gz);
if (dir)
{
blendIndices.push_back(index+0);
blendIndices.push_back(index+1);
blendIndices.push_back(index+3);
blendIndices.push_back(index+1);
blendIndices.push_back(index+2);
blendIndices.push_back(index+3);
}
else
{
blendIndices.push_back(index+0);
blendIndices.push_back(index+1);
blendIndices.push_back(index+2);
blendIndices.push_back(index+2);
blendIndices.push_back(index+3);
blendIndices.push_back(index+0);
}
}