| 274 | } |
| 275 | |
| 276 | bool IndexBuffer::GetTriangle(uint32_t i, uint32_t& v0, uint32_t& v1, uint32_t& v2) const |
| 277 | { |
| 278 | if (ValidPrimitiveType(IP_HAS_TRIANGLES)) |
| 279 | { |
| 280 | if (mData && i < mNumPrimitives) |
| 281 | { |
| 282 | if (mElementSize == sizeof(uint32_t)) |
| 283 | { |
| 284 | if (mPrimitiveType == IP_TRIMESH) |
| 285 | { |
| 286 | uint32_t const* index = 3 * static_cast<size_t>(i) + Get<uint32_t>(); |
| 287 | v0 = *index++; |
| 288 | v1 = *index++; |
| 289 | v2 = *index; |
| 290 | } |
| 291 | else if (mPrimitiveType == IP_TRISTRIP) |
| 292 | { |
| 293 | uint32_t const* index = static_cast<size_t>(i) + Get<uint32_t>(); |
| 294 | uint32_t offset = (i & 1); |
| 295 | v0 = index[0]; |
| 296 | v1 = index[1 + offset]; |
| 297 | v2 = index[2 - offset]; |
| 298 | } |
| 299 | else if (mPrimitiveType == IP_TRIMESH_ADJ) |
| 300 | { |
| 301 | uint32_t const* index = 6 * static_cast<size_t>(i) + Get<uint32_t>(); |
| 302 | v0 = index[0]; |
| 303 | v1 = index[2]; |
| 304 | v2 = index[4]; |
| 305 | } |
| 306 | else if (mPrimitiveType == IP_TRISTRIP_ADJ) |
| 307 | { |
| 308 | LogError("IP_TRISTRIP_ADJ not yet supported."); |
| 309 | } |
| 310 | } |
| 311 | else |
| 312 | { |
| 313 | if (mPrimitiveType == IP_TRIMESH) |
| 314 | { |
| 315 | uint16_t const* index = 3 * static_cast<size_t>(i) + Get<uint16_t>(); |
| 316 | v0 = static_cast<uint32_t>(*index++); |
| 317 | v1 = static_cast<uint32_t>(*index++); |
| 318 | v2 = static_cast<uint32_t>(*index); |
| 319 | } |
| 320 | else if (mPrimitiveType == IP_TRISTRIP) |
| 321 | { |
| 322 | uint16_t const* index = static_cast<size_t>(i) + Get<uint16_t>(); |
| 323 | int32_t offset = (i & 1); |
| 324 | v0 = static_cast<uint32_t>(index[0]); |
| 325 | v1 = static_cast<uint32_t>(index[1 + offset]); |
| 326 | v2 = static_cast<uint32_t>(index[2 - offset]); |
| 327 | } |
| 328 | else if (mPrimitiveType == IP_TRIMESH_ADJ) |
| 329 | { |
| 330 | uint16_t const* index = 6 * static_cast<size_t>(i) + Get<uint16_t>(); |
| 331 | v0 = index[0]; |
| 332 | v1 = index[2]; |
| 333 | v2 = index[4]; |
no outgoing calls