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https://github.com/PixarAnimationStudios/OpenSubdiv
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Each patch has a corresponding patchParam. This is a set of three values specifying additional information about the patch: faceId -- topological face identifier (e.g. Ptex FaceId) bitfield -- refinement-level, non-quad, boundary, transition, uv-offset sharpness -- crease sharpness for a single-crease patch These are stored in OsdPatchParamBuffer indexed by the value returned from OsdGetPatchIndex() which is a function of the current PrimitiveID along with an optional client provided offset. Accessors are provided to extract values from a patchParam. These are all named OsdGetPatch*(). While drawing patches, the patchParam is condensed into a patchCoord which has four values (u, v, faceLevel, faceId). These patchCoords are treated as int values during per-prim processing but are converted to float values during per-vertex processing where the values are interpolated. Also, cleaned up more of the shader namespace by giving an Osd prefix to public functions, and consolidated boundary and transition handling code into the PatchCommon shader files. The functions determining tessellation levels are now all named OsdGetTessLevel*(). |
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| .. | ||
| CMakeLists.txt | ||
| glViewer.cpp | ||
| init_shapes.h | ||
| shader_gl3.glsl | ||
| shader.glsl | ||