void CPatchRData::BuildIndices()
{
PROFILE3("build indices");
CTerrain* terrain = m_Patch->m_Parent;
ssize_t px = m_Patch->m_X * PATCH_SIZE;
ssize_t pz = m_Patch->m_Z * PATCH_SIZE;
// must have allocated some vertices before trying to build corresponding indices
ENSURE(m_VBBase);
// number of vertices in each direction in each patch
ssize_t vsize=PATCH_SIZE+1;
std::vector<unsigned short> indices;
indices.reserve(PATCH_SIZE * PATCH_SIZE * 4);
// release existing splats
m_Splats.clear();
// build grid of textures on this patch
std::vector<CTerrainTextureEntry*> textures;
CTerrainTextureEntry* texgrid[PATCH_SIZE][PATCH_SIZE];
for (ssize_t j=0;j<PATCH_SIZE;j++) {
for (ssize_t i=0;i<PATCH_SIZE;i++) {
CTerrainTextureEntry* tex=m_Patch->m_MiniPatches[j][i].GetTextureEntry();
texgrid[j][i]=tex;
if (std::find(textures.begin(),textures.end(),tex)==textures.end()) {
textures.push_back(tex);
}
}
}
// now build base splats from interior textures
m_Splats.resize(textures.size());
// build indices for base splats
size_t base=m_VBBase->m_Index;
ENSURE(base + vsize*vsize < 65536); // mustn't overflow u16 indexes
for (size_t i=0;i<m_Splats.size();i++) {
CTerrainTextureEntry* tex=textures[i];
SSplat& splat=m_Splats[i];
splat.m_Texture=tex;
splat.m_IndexStart=indices.size();
for (ssize_t j = 0; j < PATCH_SIZE; j++)
{
for (ssize_t i = 0; i < PATCH_SIZE; i++)
{
if (texgrid[j][i] == tex)
{
bool dir = terrain->GetTriangulationDir(px+i, pz+j);
if (dir)
{
indices.push_back(u16(((j+0)*vsize+(i+0))+base));
indices.push_back(u16(((j+0)*vsize+(i+1))+base));
indices.push_back(u16(((j+1)*vsize+(i+0))+base));
indices.push_back(u16(((j+0)*vsize+(i+1))+base));
indices.push_back(u16(((j+1)*vsize+(i+1))+base));
indices.push_back(u16(((j+1)*vsize+(i+0))+base));
}
else
{
indices.push_back(u16(((j+0)*vsize+(i+0))+base));
indices.push_back(u16(((j+0)*vsize+(i+1))+base));
indices.push_back(u16(((j+1)*vsize+(i+1))+base));
indices.push_back(u16(((j+1)*vsize+(i+1))+base));
indices.push_back(u16(((j+1)*vsize+(i+0))+base));
indices.push_back(u16(((j+0)*vsize+(i+0))+base));
}
}
}
}
splat.m_IndexCount=indices.size()-splat.m_IndexStart;
}
// Release existing vertex buffer chunk
if (m_VBBaseIndices)
{
g_VBMan.Release(m_VBBaseIndices);
m_VBBaseIndices = 0;
}
ENSURE(indices.size());
// Construct vertex buffer
m_VBBaseIndices = g_VBMan.Allocate(sizeof(u16), indices.size(), GL_STATIC_DRAW, GL_ELEMENT_ARRAY_BUFFER);
m_VBBaseIndices->m_Owner->UpdateChunkVertices(m_VBBaseIndices, &indices[0]);
}
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);
}
}