array_length_from_uniform.h | Explore in Territory

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#ifndef SRC_TINT_LANG_WGSL_AST_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
#define SRC_TINT_LANG_WGSL_AST_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_

#include <unordered_map>
#include <unordered_set>

#include "src/tint/api/common/binding_point.h"
#include "src/tint/lang/wgsl/ast/transform/transform.h"
#include "src/tint/utils/reflection/reflection.h"

namespace tint::ast::transform {

/// ArrayLengthFromUniform is a transform that implements calls to arrayLength()
/// by calculating the length from the total size of the storage buffer, which
/// is received via a uniform buffer.
///
/// The generated uniform buffer will have the form:
/// ```
/// struct buffer_size_struct {
///  buffer_size : array<u32, 8>;
/// };
///
/// @group(0) @binding(30)
/// var<uniform> buffer_size_ubo : buffer_size_struct;
/// ```
/// The binding group and number used for this uniform buffer is provided via
/// the `Config` transform input. The `Config` struct also defines the mapping
/// from a storage buffer's `BindingPoint` to the array index that will be used
/// to get the size of that buffer.
///
/// This transform assumes that the `SimplifyPointers`
/// transforms have been run before it so that arguments to the arrayLength
/// builtin always have the form `&resource.array`.
///
/// @note Depends on the following transforms to have been run first:
/// * SimplifyPointers
class ArrayLengthFromUniform final : public Castable<ArrayLengthFromUniform, Transform> { … };

}  // namespace tint::ast::transform

#endif  // SRC_TINT_LANG_WGSL_AST_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
chromium/third_party/dawn/src/tint/lang/wgsl/ast/transform/array_length_from_uniform.h
