| // Copyright 2016 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef COBALT_RENDER_TREE_MAP_TO_MESH_FILTER_H_ |
| #define COBALT_RENDER_TREE_MAP_TO_MESH_FILTER_H_ |
| |
| #include <map> |
| #include <utility> |
| |
| #include "base/logging.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "cobalt/math/size.h" |
| #include "cobalt/render_tree/mesh.h" |
| |
| namespace cobalt { |
| namespace render_tree { |
| |
| enum StereoMode { |
| kMono = 0, |
| // Stereoscopic modes where each half of the content represents the view of |
| // one eye, and where the texture coordinates of the meshes need to be |
| // scaled and offset to the appropriate half. The same mesh may be used for |
| // both eyes, or there may be one for each eye. |
| kLeftRight = 1, |
| kTopBottom = 2, |
| // Like kLeftRight, but where the texture coordinates already refer to the |
| // corresponding half of the content and need no adjustment. This can only |
| // happen when there are distinct meshes for each eye. |
| kLeftRightUnadjustedTextureCoords = 3 |
| }; |
| |
| // The shape of the mesh that this filter applies. |
| enum MeshType { |
| // Rectangular content: some rasterizers render rectangular video separately |
| // from the rest of the document (for example, for stereo content). Does not |
| // specify a custom mesh, since a rectangle with the content's aspect ratio |
| // can be assumed (accounting for whether it needs to be halved in one |
| // dimension for stereo). Not enabled on all rasterizers/platforms. |
| kRectangular = 0, |
| // Mesh that is centered around the camera; examples include 360 and 180 |
| // content. Needs to be specified, since the shape is arbitrary. |
| kCustomMesh = 1 |
| }; |
| |
| // A MapToMeshFilter can be used to map source content onto a 3D mesh, within a |
| // specified well-defined viewport. |
| class MapToMeshFilter { |
| public: |
| struct Builder { |
| Builder() {} |
| bool operator==(const Builder& other) const { |
| return resolution_matched_meshes_ == other.resolution_matched_meshes_ && |
| left_eye_default_mesh_ == other.left_eye_default_mesh_ && |
| right_eye_default_mesh_ == other.right_eye_default_mesh_; |
| } |
| |
| void SetDefaultMeshes( |
| const scoped_refptr<render_tree::Mesh>& left_eye_mesh, |
| const scoped_refptr<render_tree::Mesh>& right_eye_mesh) { |
| left_eye_default_mesh_ = left_eye_mesh; |
| right_eye_default_mesh_ = right_eye_mesh; |
| } |
| void AddResolutionMatchedMeshes( |
| math::Size resolution, |
| const scoped_refptr<render_tree::Mesh>& left_eye_mesh, |
| const scoped_refptr<render_tree::Mesh>& right_eye_mesh) { |
| DCHECK_GT(resolution.width(), 0); |
| DCHECK_GT(resolution.height(), 0); |
| DCHECK(left_eye_mesh); |
| resolution_matched_meshes_[resolution] = |
| std::make_pair(left_eye_mesh, right_eye_mesh); |
| } |
| const scoped_refptr<render_tree::Mesh>& left_eye_mesh( |
| math::Size resolution) const { |
| MeshMap::const_iterator match = |
| resolution_matched_meshes_.find(resolution); |
| if (match != resolution_matched_meshes_.end()) { |
| return match->second.first; |
| } |
| return left_eye_default_mesh_; |
| } |
| const scoped_refptr<render_tree::Mesh>& right_eye_mesh( |
| math::Size resolution) const { |
| MeshMap::const_iterator match = |
| resolution_matched_meshes_.find(resolution); |
| if (match != resolution_matched_meshes_.end()) { |
| return match->second.second; |
| } |
| return right_eye_default_mesh_; |
| } |
| |
| private: |
| struct SizeLessThan { |
| bool operator()(const math::Size& a, const math::Size& b) const { |
| return a.width() < b.width() || |
| (a.width() == b.width() && a.height() < b.height()); |
| } |
| }; |
| typedef std::pair<scoped_refptr<render_tree::Mesh>, |
| scoped_refptr<render_tree::Mesh> > MeshPair; |
| typedef std::map<math::Size, MeshPair, SizeLessThan> MeshMap; |
| MeshMap resolution_matched_meshes_; |
| scoped_refptr<render_tree::Mesh> left_eye_default_mesh_; |
| scoped_refptr<render_tree::Mesh> right_eye_default_mesh_; |
| }; |
| |
| MapToMeshFilter(StereoMode stereo_mode, const Builder& builder) |
| : stereo_mode_(stereo_mode), mesh_type_(kCustomMesh), data_(builder) { |
| DCHECK(left_eye_mesh()); |
| if (stereo_mode == kLeftRightUnadjustedTextureCoords) { |
| // This stereo mode implies there are two meshes. |
| DCHECK(right_eye_mesh()); |
| } |
| } |
| |
| // A filter without a an explicit mesh, to represent mesh-mapped content whose |
| // mesh will be supplied externally. |
| MapToMeshFilter(StereoMode stereo_mode, MeshType mesh_type) |
| : stereo_mode_(stereo_mode), mesh_type_(mesh_type), data_() { |
| DCHECK(mesh_type != kCustomMesh); |
| DCHECK(stereo_mode != kLeftRightUnadjustedTextureCoords); |
| } |
| |
| bool operator==(const MapToMeshFilter& other) const { |
| return stereo_mode_ == other.stereo_mode_ && data_ == other.data_; |
| } |
| |
| StereoMode stereo_mode() const { return stereo_mode_; } |
| |
| MeshType mesh_type() const { return mesh_type_; } |
| |
| // The omission of the |resolution| parameter will yield the default |
| // meshes in each of the following functions (by failing to match the |
| // invalid resolution). |
| const scoped_refptr<render_tree::Mesh>& mono_mesh( |
| math::Size resolution = InvalidSize()) const { |
| return data_.left_eye_mesh(resolution); |
| } |
| |
| const scoped_refptr<render_tree::Mesh>& left_eye_mesh( |
| math::Size resolution = InvalidSize()) const { |
| return data_.left_eye_mesh(resolution); |
| } |
| |
| const scoped_refptr<render_tree::Mesh>& right_eye_mesh( |
| math::Size resolution = InvalidSize()) const { |
| return data_.right_eye_mesh(resolution); |
| } |
| |
| private: |
| static math::Size InvalidSize() { return math::Size(-1, -1); } |
| StereoMode stereo_mode_; |
| MeshType mesh_type_; |
| Builder data_; |
| }; |
| |
| } // namespace render_tree |
| } // namespace cobalt |
| |
| #endif // COBALT_RENDER_TREE_MAP_TO_MESH_FILTER_H_ |