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Diffstat (limited to 'source/blender/draw/intern/draw_subdivision.h')
| -rw-r--r-- | source/blender/draw/intern/draw_subdivision.h | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/source/blender/draw/intern/draw_subdivision.h b/source/blender/draw/intern/draw_subdivision.h new file mode 100644 index 00000000000..f60ec7afc77 --- /dev/null +++ b/source/blender/draw/intern/draw_subdivision.h @@ -0,0 +1,231 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright 2021, Blender Foundation. + */ + +#pragma once + +#ifdef __cplusplus +extern "C" { +#endif + +#include "BLI_sys_types.h" + +struct BMesh; +struct GPUIndexBuf; +struct GPUUniformBuf; +struct GPUVertBuf; +struct Mesh; +struct MeshBatchCache; +struct MeshBufferCache; +struct MeshRenderData; +struct Object; +struct Scene; +struct Subdiv; +struct ToolSettings; + +/* -------------------------------------------------------------------- */ +/** \name DRWPatchMap + * + * This is a GPU version of the OpenSubDiv PatchMap. The quad tree and the patch handles are copied + * to GPU buffers in order to lookup the right patch for a given set of patch coordinates. + * \{ */ + +typedef struct DRWPatchMap { + struct GPUVertBuf *patch_map_handles; + struct GPUVertBuf *patch_map_quadtree; + int min_patch_face; + int max_patch_face; + int max_depth; + int patches_are_triangular; +} DRWPatchMap; + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name DRWSubdivCache + * + * This holds the various buffers used to evaluate and render subdivision through OpenGL. + * \{ */ + +typedef struct DRWSubdivCache { + struct Mesh *mesh; + struct BMesh *bm; + struct Subdiv *subdiv; + bool optimal_display; + bool do_limit_normals; + + /* Coordinates used to evaluate patches for UVs, positions, and normals. */ + struct GPUVertBuf *patch_coords; + /* Coordinates used to evaluate patches for the face centers (or face dots) in edit-mode. */ + struct GPUVertBuf *fdots_patch_coords; + + /* Resolution used to generate the patch coordinates. */ + int resolution; + + /* Number of subdivided loops, also the number of patch coordinates since we have one coordinate + * but quad corner/vertex. */ + uint num_subdiv_loops; + uint num_subdiv_edges; + uint num_subdiv_triangles; + uint num_subdiv_verts; + uint num_subdiv_quads; + + /* Number of polygons in the coarse mesh, notably used to compute a coarse polygon index given a + * subdivision loop index. */ + int num_coarse_poly; + + /* Maps subdivision loop to subdivided vertex index. */ + int *subdiv_loop_subdiv_vert_index; + /* Maps subdivision loop to original coarse poly index. */ + int *subdiv_loop_poly_index; + + /* Indices of faces adjacent to the vertices, ordered by vertex index, with no particular + * winding. */ + struct GPUVertBuf *subdiv_vertex_face_adjacency; + /* The difference between value (i + 1) and (i) gives the number of faces adjacent to vertex (i). + */ + struct GPUVertBuf *subdiv_vertex_face_adjacency_offsets; + + /* Maps subdivision loop to original coarse vertex index, only really useful for edit mode. */ + struct GPUVertBuf *verts_orig_index; + /* Maps subdivision loop to original coarse edge index, only really useful for edit mode. */ + struct GPUVertBuf *edges_orig_index; + + /* Owned by #Subdiv. Indexed by coarse polygon index, difference between value (i + 1) and (i) + * gives the number of ptex faces for coarse polygon (i). */ + int *face_ptex_offset; + /* Vertex buffer for face_ptex_offset. */ + struct GPUVertBuf *face_ptex_offset_buffer; + + int *subdiv_polygon_offset; + struct GPUVertBuf *subdiv_polygon_offset_buffer; + + /* Contains the start loop index and the smooth flag for each coarse polygon. */ + struct GPUVertBuf *extra_coarse_face_data; + + /* Computed for ibo.points, one value per subdivided vertex, mapping coarse vertices -> + * subdivided loop */ + int *point_indices; + + /* Material offsets. */ + int *mat_start; + int *mat_end; + struct GPUVertBuf *polygon_mat_offset; + + DRWPatchMap gpu_patch_map; + + /* UBO to store settings for the various compute shaders. */ + struct GPUUniformBuf *ubo; +} DRWSubdivCache; + +/* Only frees the data of the cache, caller is responsible to free the cache itself if necessary. + */ +void draw_subdiv_cache_free(DRWSubdivCache *cache); + +/** \} */ + +void DRW_create_subdivision(const struct Scene *scene, + struct Object *ob, + struct Mesh *mesh, + struct MeshBatchCache *batch_cache, + struct MeshBufferCache *mbc, + const struct ToolSettings *toolsettings); + +void DRW_subdiv_cache_free(struct Subdiv *subdiv); + +void draw_subdiv_init_mesh_render_data(DRWSubdivCache *cache, + struct MeshRenderData *mr, + const struct ToolSettings *toolsettings); + +void draw_subdiv_init_origindex_buffer(struct GPUVertBuf *buffer, + int *vert_origindex, + uint num_loops, + uint loose_len); + +struct GPUVertBuf *draw_subdiv_build_origindex_buffer(int *vert_origindex, uint num_loops); + +/* Compute shader functions. */ + +void draw_subdiv_build_sculpt_data_buffer(const DRWSubdivCache *cache, + struct GPUVertBuf *mask_vbo, + struct GPUVertBuf *face_set_vbo, + struct GPUVertBuf *sculpt_data); + +void draw_subdiv_accumulate_normals(const DRWSubdivCache *cache, + struct GPUVertBuf *pos_nor, + struct GPUVertBuf *face_adjacency_offsets, + struct GPUVertBuf *face_adjacency_lists, + struct GPUVertBuf *vertex_normals); + +void draw_subdiv_finalize_normals(const DRWSubdivCache *cache, + struct GPUVertBuf *vertex_normals, + struct GPUVertBuf *subdiv_loop_subdiv_vert_index, + struct GPUVertBuf *pos_nor); + +void draw_subdiv_extract_pos_nor(const DRWSubdivCache *cache, + struct GPUVertBuf *pos_nor, + const bool do_limit_normals); + +void draw_subdiv_interp_custom_data(const DRWSubdivCache *cache, + struct GPUVertBuf *src_data, + struct GPUVertBuf *dst_buffer, + int dimensions, + int dst_offset); + +void draw_subdiv_extract_uvs(const DRWSubdivCache *cache, + struct GPUVertBuf *uvs, + const int face_varying_channel, + const int dst_offset); + +void draw_subdiv_build_edge_fac_buffer(const DRWSubdivCache *cache, + struct GPUVertBuf *pos_nor, + struct GPUVertBuf *edge_idx, + struct GPUVertBuf *edge_fac); + +void draw_subdiv_build_tris_buffer(const DRWSubdivCache *cache, + struct GPUIndexBuf *subdiv_tris, + const int material_count); + +void draw_subdiv_build_lines_buffer(const DRWSubdivCache *cache, + struct GPUIndexBuf *lines_indices); + +void draw_subdiv_build_lines_loose_buffer(const DRWSubdivCache *cache, + struct GPUIndexBuf *lines_indices, + uint num_loose_edges); + +void draw_subdiv_build_fdots_buffers(const DRWSubdivCache *cache, + struct GPUVertBuf *fdots_pos, + struct GPUVertBuf *fdots_nor, + struct GPUIndexBuf *fdots_indices); + +void draw_subdiv_build_lnor_buffer(const DRWSubdivCache *cache, + struct GPUVertBuf *pos_nor, + struct GPUVertBuf *lnor); + +void draw_subdiv_build_edituv_stretch_area_buffer(const DRWSubdivCache *cache, + struct GPUVertBuf *coarse_data, + struct GPUVertBuf *subdiv_data); + +void draw_subdiv_build_edituv_stretch_angle_buffer(const DRWSubdivCache *cache, + struct GPUVertBuf *pos_nor, + struct GPUVertBuf *uvs, + int uvs_offset, + struct GPUVertBuf *stretch_angles); + +#ifdef __cplusplus +} +#endif |