| // Copyright 2021 The Dawn & Tint Authors |
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| #ifndef SRC_TINT_LANG_WGSL_AST_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_ |
| #define SRC_TINT_LANG_WGSL_AST_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_ |
| |
| #include <unordered_map> |
| #include <utility> |
| |
| #include "src/tint/api/common/binding_point.h" |
| #include "src/tint/api/options/external_texture.h" |
| #include "src/tint/lang/core/builtin_fn.h" |
| #include "src/tint/lang/wgsl/ast/struct_member.h" |
| #include "src/tint/lang/wgsl/ast/transform/transform.h" |
| #include "src/tint/utils/reflection/reflection.h" |
| |
| namespace tint::ast::transform { |
| |
| /// Within the MultiplanarExternalTexture transform, each instance of a |
| /// texture_external binding is unpacked into two texture_2d<f32> bindings |
| /// representing two possible planes of a texture and a uniform buffer binding |
| /// representing a struct of parameters. Calls to textureLoad or |
| /// textureSampleLevel that contain a texture_external parameter will be |
| /// transformed into a newly generated version of the function, which can |
| /// perform the desired operation on a single RGBA plane or on separate Y and UV |
| /// planes, and do colorspace conversions including yuv->rgb conversion, gamma |
| /// decoding, gamut conversion, and gamma encoding steps. Specifically |
| // for BT.709 to SRGB conversion, it takes the fast path only doing the yuv->rgb |
| // step and skipping all other steps. |
| class MultiplanarExternalTexture final : public Castable<MultiplanarExternalTexture, Transform> { |
| public: |
| /// This struct identifies the binding groups and locations for new bindings to |
| /// use when transforming a texture_external instance. |
| using BindingPoints = ExternalTextureOptions::BindingPoints; |
| |
| /// BindingsMap is a map where the key is the binding location of a |
| /// texture_external and the value is a struct containing the desired |
| /// locations for new bindings expanded from the texture_external instance. |
| using BindingsMap = ExternalTextureOptions::BindingsMap; |
| |
| /// NewBindingPoints is consumed by the MultiplanarExternalTexture transform. |
| /// Data holds information about location of each texture_external binding and |
| /// which binding slots it should expand into. |
| struct NewBindingPoints final : public Castable<NewBindingPoints, Data> { |
| /// Constructor |
| NewBindingPoints(); |
| |
| /// Constructor |
| /// @param bm a map to the new binding slots to use. |
| /// @param may_collide if true, then validation will be disabled for binding point |
| /// collisions generated by this transform |
| explicit NewBindingPoints(BindingsMap bm, bool may_collide = false); |
| |
| /// Destructor |
| ~NewBindingPoints() override; |
| |
| /// A map of new binding points to use. |
| BindingsMap bindings_map; |
| |
| /// If true, then validation will be disabled for bindign poitn collisions generated by this |
| /// transform. |
| bool allow_collisions = false; |
| |
| /// Reflection for this struct |
| TINT_REFLECT(NewBindingPoints, bindings_map, allow_collisions); |
| }; |
| |
| /// Constructor |
| MultiplanarExternalTexture(); |
| /// Destructor |
| ~MultiplanarExternalTexture() override; |
| |
| /// @copydoc Transform::Apply |
| ApplyResult Apply(const Program& program, |
| const DataMap& inputs, |
| DataMap& outputs) const override; |
| |
| private: |
| struct State; |
| }; |
| |
| } // namespace tint::ast::transform |
| |
| #endif // SRC_TINT_LANG_WGSL_AST_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_ |