| // Copyright 2025 The Dawn & Tint Authors |
| // |
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| |
| #ifndef SRC_TINT_LANG_CORE_IR_TRANSFORM_VERTEX_PULLING_H_ |
| #define SRC_TINT_LANG_CORE_IR_TRANSFORM_VERTEX_PULLING_H_ |
| |
| #include "src/tint/api/common/vertex_pulling_config.h" |
| #include "src/tint/lang/core/ir/validator.h" |
| #include "src/tint/utils/result.h" |
| |
| // Forward declarations. |
| namespace tint::core::ir { |
| class Module; |
| } // namespace tint::core::ir |
| |
| namespace tint::core::ir::transform { |
| |
| /// The capabilities that the transform can support. |
| // TODO(crbug.com/363031535): Remove kAllowDuplicateBindings when MSL no |
| // longer needs FlattenBindings. |
| const Capabilities kVertexPullingCapabilities{Capability::kAllowDuplicateBindings}; |
| |
| /// This transform replaces vertex shader inputs with storage buffers, so that we can apply |
| /// robustness to the vertex input accesses. |
| /// |
| /// We bind the storage buffers as arrays of u32, so any read to byte position `p` will actually |
| /// need to read position `p / 4`, since `sizeof(u32) == 4`. |
| /// |
| /// The config specifies the input format for each attribute. This isn't related to the type of the |
| /// input in the shader. For example, `VertexFormat::kVec2F16` tells us that the buffer will |
| /// contain `f16` elements, to be read as `vec2`. In the shader, a user would declare a `vec2<f32>` |
| /// input to be able to use them. The conversion between `f16` and `f32` is handled by this |
| /// transform. |
| /// |
| /// @param module the module to transform |
| /// @param config the vertex pulling configuration |
| /// @returns success or failure |
| Result<SuccessType> VertexPulling(core::ir::Module& module, const VertexPullingConfig& config); |
| |
| } // namespace tint::core::ir::transform |
| |
| #endif // SRC_TINT_LANG_CORE_IR_TRANSFORM_VERTEX_PULLING_H_ |
