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block.rs
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block.rs
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/*!
Implementations for `BlockContext` methods.
*/
use super::{
index::BoundsCheckResult, make_local, selection::Selection, Block, BlockContext, Dimension,
Error, Instruction, LocalType, LookupType, LoopContext, ResultMember, Writer, WriterFlags,
};
use crate::{arena::Handle, proc::TypeResolution};
use spirv::Word;
fn get_dimension(type_inner: &crate::TypeInner) -> Dimension {
match *type_inner {
crate::TypeInner::Scalar { .. } => Dimension::Scalar,
crate::TypeInner::Vector { .. } => Dimension::Vector,
crate::TypeInner::Matrix { .. } => Dimension::Matrix,
_ => unreachable!(),
}
}
/// The results of emitting code for a left-hand-side expression.
///
/// On success, `write_expression_pointer` returns one of these.
enum ExpressionPointer {
/// The pointer to the expression's value is available, as the value of the
/// expression with the given id.
Ready { pointer_id: Word },
/// The access expression must be conditional on the value of `condition`, a boolean
/// expression that is true if all indices are in bounds. If `condition` is true, then
/// `access` is an `OpAccessChain` instruction that will compute a pointer to the
/// expression's value. If `condition` is false, then executing `access` would be
/// undefined behavior.
Conditional {
condition: Word,
access: Instruction,
},
}
/// The termination statement to be added to the end of the block
pub enum BlockExit {
/// Generates an OpReturn (void return)
Return,
/// Generates an OpBranch to the specified block
Branch {
/// The branch target block
target: Word,
},
/// Translates a loop `break if` into an `OpBranchConditional` to the
/// merge block if true (the merge block is passed through [`LoopContext::break_id`]
/// or else to the loop header (passed through [`preamble_id`])
///
/// [`preamble_id`]: Self::BreakIf::preamble_id
BreakIf {
/// The condition of the `break if`
condition: Handle<crate::Expression>,
/// The loop header block id
preamble_id: Word,
},
}
impl Writer {
// Flip Y coordinate to adjust for coordinate space difference
// between SPIR-V and our IR.
// The `position_id` argument is a pointer to a `vecN<f32>`,
// whose `y` component we will negate.
fn write_epilogue_position_y_flip(
&mut self,
position_id: Word,
body: &mut Vec<Instruction>,
) -> Result<(), Error> {
let float_ptr_type_id = self.get_type_id(LookupType::Local(LocalType::Value {
vector_size: None,
kind: crate::ScalarKind::Float,
width: 4,
pointer_space: Some(spirv::StorageClass::Output),
}));
let index_y_id = self.get_index_constant(1);
let access_id = self.id_gen.next();
body.push(Instruction::access_chain(
float_ptr_type_id,
access_id,
position_id,
&[index_y_id],
));
let float_type_id = self.get_type_id(LookupType::Local(LocalType::Value {
vector_size: None,
kind: crate::ScalarKind::Float,
width: 4,
pointer_space: None,
}));
let load_id = self.id_gen.next();
body.push(Instruction::load(float_type_id, load_id, access_id, None));
let neg_id = self.id_gen.next();
body.push(Instruction::unary(
spirv::Op::FNegate,
float_type_id,
neg_id,
load_id,
));
body.push(Instruction::store(access_id, neg_id, None));
Ok(())
}
// Clamp fragment depth between 0 and 1.
fn write_epilogue_frag_depth_clamp(
&mut self,
frag_depth_id: Word,
body: &mut Vec<Instruction>,
) -> Result<(), Error> {
let float_type_id = self.get_type_id(LookupType::Local(LocalType::Value {
vector_size: None,
kind: crate::ScalarKind::Float,
width: 4,
pointer_space: None,
}));
let value0_id = self.get_constant_scalar(crate::ScalarValue::Float(0.0), 4);
let value1_id = self.get_constant_scalar(crate::ScalarValue::Float(1.0), 4);
let original_id = self.id_gen.next();
body.push(Instruction::load(
float_type_id,
original_id,
frag_depth_id,
None,
));
let clamp_id = self.id_gen.next();
body.push(Instruction::ext_inst(
self.gl450_ext_inst_id,
spirv::GLOp::FClamp,
float_type_id,
clamp_id,
&[original_id, value0_id, value1_id],
));
body.push(Instruction::store(frag_depth_id, clamp_id, None));
Ok(())
}
fn write_entry_point_return(
&mut self,
value_id: Word,
ir_result: &crate::FunctionResult,
result_members: &[ResultMember],
body: &mut Vec<Instruction>,
) -> Result<(), Error> {
for (index, res_member) in result_members.iter().enumerate() {
let member_value_id = match ir_result.binding {
Some(_) => value_id,
None => {
let member_value_id = self.id_gen.next();
body.push(Instruction::composite_extract(
res_member.type_id,
member_value_id,
value_id,
&[index as u32],
));
member_value_id
}
};
body.push(Instruction::store(res_member.id, member_value_id, None));
match res_member.built_in {
Some(crate::BuiltIn::Position { .. })
if self.flags.contains(WriterFlags::ADJUST_COORDINATE_SPACE) =>
{
self.write_epilogue_position_y_flip(res_member.id, body)?;
}
Some(crate::BuiltIn::FragDepth)
if self.flags.contains(WriterFlags::CLAMP_FRAG_DEPTH) =>
{
self.write_epilogue_frag_depth_clamp(res_member.id, body)?;
}
_ => {}
}
}
Ok(())
}
}
impl<'w> BlockContext<'w> {
/// Decide whether to put off emitting instructions for `expr_handle`.
///
/// We would like to gather together chains of `Access` and `AccessIndex`
/// Naga expressions into a single `OpAccessChain` SPIR-V instruction. To do
/// this, we don't generate instructions for these exprs when we first
/// encounter them. Their ids in `self.writer.cached.ids` are left as zero. Then,
/// once we encounter a `Load` or `Store` expression that actually needs the
/// chain's value, we call `write_expression_pointer` to handle the whole
/// thing in one fell swoop.
fn is_intermediate(&self, expr_handle: Handle<crate::Expression>) -> bool {
match self.ir_function.expressions[expr_handle] {
crate::Expression::GlobalVariable(handle) => {
let ty = self.ir_module.global_variables[handle].ty;
match self.ir_module.types[ty].inner {
crate::TypeInner::BindingArray { .. } => false,
_ => true,
}
}
crate::Expression::LocalVariable(_) => true,
crate::Expression::FunctionArgument(index) => {
let arg = &self.ir_function.arguments[index as usize];
self.ir_module.types[arg.ty].inner.pointer_space().is_some()
}
// The chain rule: if this `Access...`'s `base` operand was
// previously omitted, then omit this one, too.
_ => self.cached.ids[expr_handle.index()] == 0,
}
}
/// Cache an expression for a value.
pub(super) fn cache_expression_value(
&mut self,
expr_handle: Handle<crate::Expression>,
block: &mut Block,
) -> Result<(), Error> {
let result_type_id = self.get_expression_type_id(&self.fun_info[expr_handle].ty);
let id = match self.ir_function.expressions[expr_handle] {
crate::Expression::Access { base, index: _ } if self.is_intermediate(base) => {
// See `is_intermediate`; we'll handle this later in
// `write_expression_pointer`.
0
}
crate::Expression::Access { base, index } => {
let base_ty_inner = self.fun_info[base].ty.inner_with(&self.ir_module.types);
match *base_ty_inner {
crate::TypeInner::Vector { .. } => {
self.write_vector_access(expr_handle, base, index, block)?
}
crate::TypeInner::BindingArray {
base: binding_type, ..
} => {
let binding_array_false_pointer = LookupType::Local(LocalType::Pointer {
base: binding_type,
class: spirv::StorageClass::UniformConstant,
});
let result_id = match self.write_expression_pointer(
expr_handle,
block,
Some(binding_array_false_pointer),
)? {
ExpressionPointer::Ready { pointer_id } => pointer_id,
ExpressionPointer::Conditional { .. } => {
return Err(Error::FeatureNotImplemented(
"Texture array out-of-bounds handling",
));
}
};
let binding_type_id = self.get_type_id(LookupType::Handle(binding_type));
let load_id = self.gen_id();
block.body.push(Instruction::load(
binding_type_id,
load_id,
result_id,
None,
));
if self.fun_info[index].uniformity.non_uniform_result.is_some() {
self.writer.require_any(
"NonUniformEXT",
&[spirv::Capability::ShaderNonUniform],
)?;
self.writer.use_extension("SPV_EXT_descriptor_indexing");
self.writer
.decorate(load_id, spirv::Decoration::NonUniform, &[]);
}
load_id
}
ref other => {
log::error!(
"Unable to access base {:?} of type {:?}",
self.ir_function.expressions[base],
other
);
return Err(Error::Validation(
"only vectors may be dynamically indexed by value",
));
}
}
}
crate::Expression::AccessIndex { base, index: _ } if self.is_intermediate(base) => {
// See `is_intermediate`; we'll handle this later in
// `write_expression_pointer`.
0
}
crate::Expression::AccessIndex { base, index } => {
match *self.fun_info[base].ty.inner_with(&self.ir_module.types) {
crate::TypeInner::Vector { .. }
| crate::TypeInner::Matrix { .. }
| crate::TypeInner::Array { .. }
| crate::TypeInner::Struct { .. } => {
// We never need bounds checks here: dynamically sized arrays can
// only appear behind pointers, and are thus handled by the
// `is_intermediate` case above. Everything else's size is
// statically known and checked in validation.
let id = self.gen_id();
let base_id = self.cached[base];
block.body.push(Instruction::composite_extract(
result_type_id,
id,
base_id,
&[index],
));
id
}
crate::TypeInner::BindingArray {
base: binding_type, ..
} => {
let binding_array_false_pointer = LookupType::Local(LocalType::Pointer {
base: binding_type,
class: spirv::StorageClass::UniformConstant,
});
let result_id = match self.write_expression_pointer(
expr_handle,
block,
Some(binding_array_false_pointer),
)? {
ExpressionPointer::Ready { pointer_id } => pointer_id,
ExpressionPointer::Conditional { .. } => {
return Err(Error::FeatureNotImplemented(
"Texture array out-of-bounds handling",
));
}
};
let binding_type_id = self.get_type_id(LookupType::Handle(binding_type));
let load_id = self.gen_id();
block.body.push(Instruction::load(
binding_type_id,
load_id,
result_id,
None,
));
load_id
}
ref other => {
log::error!("Unable to access index of {:?}", other);
return Err(Error::FeatureNotImplemented("access index for type"));
}
}
}
crate::Expression::GlobalVariable(handle) => {
self.writer.global_variables[handle.index()].access_id
}
crate::Expression::Constant(handle) => self.writer.constant_ids[handle.index()],
crate::Expression::Splat { size, value } => {
let value_id = self.cached[value];
let components = [value_id; 4];
let id = self.gen_id();
block.body.push(Instruction::composite_construct(
result_type_id,
id,
&components[..size as usize],
));
id
}
crate::Expression::Swizzle {
size,
vector,
pattern,
} => {
let vector_id = self.cached[vector];
self.temp_list.clear();
for &sc in pattern[..size as usize].iter() {
self.temp_list.push(sc as Word);
}
let id = self.gen_id();
block.body.push(Instruction::vector_shuffle(
result_type_id,
id,
vector_id,
vector_id,
&self.temp_list,
));
id
}
crate::Expression::Compose {
ty: _,
ref components,
} => {
self.temp_list.clear();
for &component in components {
self.temp_list.push(self.cached[component]);
}
let id = self.gen_id();
block.body.push(Instruction::composite_construct(
result_type_id,
id,
&self.temp_list,
));
id
}
crate::Expression::Unary { op, expr } => {
let id = self.gen_id();
let expr_id = self.cached[expr];
let expr_ty_inner = self.fun_info[expr].ty.inner_with(&self.ir_module.types);
let spirv_op = match op {
crate::UnaryOperator::Negate => match expr_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Float) => spirv::Op::FNegate,
Some(crate::ScalarKind::Sint) => spirv::Op::SNegate,
Some(crate::ScalarKind::Bool) => spirv::Op::LogicalNot,
Some(crate::ScalarKind::Uint) | None => {
log::error!("Unable to negate {:?}", expr_ty_inner);
return Err(Error::FeatureNotImplemented("negation"));
}
},
crate::UnaryOperator::Not => match expr_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Bool) => spirv::Op::LogicalNot,
_ => spirv::Op::Not,
},
};
block
.body
.push(Instruction::unary(spirv_op, result_type_id, id, expr_id));
id
}
crate::Expression::Binary { op, left, right } => {
let id = self.gen_id();
let left_id = self.cached[left];
let right_id = self.cached[right];
let left_ty_inner = self.fun_info[left].ty.inner_with(&self.ir_module.types);
let right_ty_inner = self.fun_info[right].ty.inner_with(&self.ir_module.types);
let left_dimension = get_dimension(left_ty_inner);
let right_dimension = get_dimension(right_ty_inner);
let mut reverse_operands = false;
let spirv_op = match op {
crate::BinaryOperator::Add => match *left_ty_inner {
crate::TypeInner::Scalar { kind, .. }
| crate::TypeInner::Vector { kind, .. } => match kind {
crate::ScalarKind::Float => spirv::Op::FAdd,
_ => spirv::Op::IAdd,
},
crate::TypeInner::Matrix {
columns,
rows,
width,
} => {
self.write_matrix_matrix_column_op(
block,
id,
result_type_id,
left_id,
right_id,
columns,
rows,
width,
spirv::Op::FAdd,
);
self.cached[expr_handle] = id;
return Ok(());
}
_ => unimplemented!(),
},
crate::BinaryOperator::Subtract => match *left_ty_inner {
crate::TypeInner::Scalar { kind, .. }
| crate::TypeInner::Vector { kind, .. } => match kind {
crate::ScalarKind::Float => spirv::Op::FSub,
_ => spirv::Op::ISub,
},
crate::TypeInner::Matrix {
columns,
rows,
width,
} => {
self.write_matrix_matrix_column_op(
block,
id,
result_type_id,
left_id,
right_id,
columns,
rows,
width,
spirv::Op::FSub,
);
self.cached[expr_handle] = id;
return Ok(());
}
_ => unimplemented!(),
},
crate::BinaryOperator::Multiply => match (left_dimension, right_dimension) {
(Dimension::Scalar, Dimension::Vector) => {
self.write_vector_scalar_mult(
block,
id,
result_type_id,
right_id,
left_id,
right_ty_inner,
);
self.cached[expr_handle] = id;
return Ok(());
}
(Dimension::Vector, Dimension::Scalar) => {
self.write_vector_scalar_mult(
block,
id,
result_type_id,
left_id,
right_id,
left_ty_inner,
);
self.cached[expr_handle] = id;
return Ok(());
}
(Dimension::Vector, Dimension::Matrix) => spirv::Op::VectorTimesMatrix,
(Dimension::Matrix, Dimension::Scalar) => spirv::Op::MatrixTimesScalar,
(Dimension::Scalar, Dimension::Matrix) => {
reverse_operands = true;
spirv::Op::MatrixTimesScalar
}
(Dimension::Matrix, Dimension::Vector) => spirv::Op::MatrixTimesVector,
(Dimension::Matrix, Dimension::Matrix) => spirv::Op::MatrixTimesMatrix,
(Dimension::Vector, Dimension::Vector)
| (Dimension::Scalar, Dimension::Scalar)
if left_ty_inner.scalar_kind() == Some(crate::ScalarKind::Float) =>
{
spirv::Op::FMul
}
(Dimension::Vector, Dimension::Vector)
| (Dimension::Scalar, Dimension::Scalar) => spirv::Op::IMul,
},
crate::BinaryOperator::Divide => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint) => spirv::Op::SDiv,
Some(crate::ScalarKind::Uint) => spirv::Op::UDiv,
Some(crate::ScalarKind::Float) => spirv::Op::FDiv,
_ => unimplemented!(),
},
crate::BinaryOperator::Modulo => match left_ty_inner.scalar_kind() {
// TODO: handle undefined behavior
// if right == 0 return 0
// if left == min(type_of(left)) && right == -1 return 0
Some(crate::ScalarKind::Sint) => spirv::Op::SRem,
// TODO: handle undefined behavior
// if right == 0 return 0
Some(crate::ScalarKind::Uint) => spirv::Op::UMod,
// TODO: handle undefined behavior
// if right == 0 return ? see https://github.com/gpuweb/gpuweb/issues/2798
Some(crate::ScalarKind::Float) => spirv::Op::FRem,
_ => unimplemented!(),
},
crate::BinaryOperator::Equal => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint | crate::ScalarKind::Uint) => {
spirv::Op::IEqual
}
Some(crate::ScalarKind::Float) => spirv::Op::FOrdEqual,
Some(crate::ScalarKind::Bool) => spirv::Op::LogicalEqual,
_ => unimplemented!(),
},
crate::BinaryOperator::NotEqual => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint | crate::ScalarKind::Uint) => {
spirv::Op::INotEqual
}
Some(crate::ScalarKind::Float) => spirv::Op::FOrdNotEqual,
Some(crate::ScalarKind::Bool) => spirv::Op::LogicalNotEqual,
_ => unimplemented!(),
},
crate::BinaryOperator::Less => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint) => spirv::Op::SLessThan,
Some(crate::ScalarKind::Uint) => spirv::Op::ULessThan,
Some(crate::ScalarKind::Float) => spirv::Op::FOrdLessThan,
_ => unimplemented!(),
},
crate::BinaryOperator::LessEqual => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint) => spirv::Op::SLessThanEqual,
Some(crate::ScalarKind::Uint) => spirv::Op::ULessThanEqual,
Some(crate::ScalarKind::Float) => spirv::Op::FOrdLessThanEqual,
_ => unimplemented!(),
},
crate::BinaryOperator::Greater => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint) => spirv::Op::SGreaterThan,
Some(crate::ScalarKind::Uint) => spirv::Op::UGreaterThan,
Some(crate::ScalarKind::Float) => spirv::Op::FOrdGreaterThan,
_ => unimplemented!(),
},
crate::BinaryOperator::GreaterEqual => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint) => spirv::Op::SGreaterThanEqual,
Some(crate::ScalarKind::Uint) => spirv::Op::UGreaterThanEqual,
Some(crate::ScalarKind::Float) => spirv::Op::FOrdGreaterThanEqual,
_ => unimplemented!(),
},
crate::BinaryOperator::And => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Bool) => spirv::Op::LogicalAnd,
_ => spirv::Op::BitwiseAnd,
},
crate::BinaryOperator::ExclusiveOr => spirv::Op::BitwiseXor,
crate::BinaryOperator::InclusiveOr => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Bool) => spirv::Op::LogicalOr,
_ => spirv::Op::BitwiseOr,
},
crate::BinaryOperator::LogicalAnd => spirv::Op::LogicalAnd,
crate::BinaryOperator::LogicalOr => spirv::Op::LogicalOr,
crate::BinaryOperator::ShiftLeft => spirv::Op::ShiftLeftLogical,
crate::BinaryOperator::ShiftRight => match left_ty_inner.scalar_kind() {
Some(crate::ScalarKind::Sint) => spirv::Op::ShiftRightArithmetic,
Some(crate::ScalarKind::Uint) => spirv::Op::ShiftRightLogical,
_ => unimplemented!(),
},
};
block.body.push(Instruction::binary(
spirv_op,
result_type_id,
id,
if reverse_operands { right_id } else { left_id },
if reverse_operands { left_id } else { right_id },
));
id
}
crate::Expression::Math {
fun,
arg,
arg1,
arg2,
arg3,
} => {
use crate::MathFunction as Mf;
enum MathOp {
Ext(spirv::GLOp),
Custom(Instruction),
}
let arg0_id = self.cached[arg];
let arg_ty = self.fun_info[arg].ty.inner_with(&self.ir_module.types);
let arg_scalar_kind = arg_ty.scalar_kind();
let arg1_id = match arg1 {
Some(handle) => self.cached[handle],
None => 0,
};
let arg2_id = match arg2 {
Some(handle) => self.cached[handle],
None => 0,
};
let arg3_id = match arg3 {
Some(handle) => self.cached[handle],
None => 0,
};
let id = self.gen_id();
let math_op = match fun {
// comparison
Mf::Abs => {
match arg_scalar_kind {
Some(crate::ScalarKind::Float) => MathOp::Ext(spirv::GLOp::FAbs),
Some(crate::ScalarKind::Sint) => MathOp::Ext(spirv::GLOp::SAbs),
Some(crate::ScalarKind::Uint) => {
MathOp::Custom(Instruction::unary(
spirv::Op::CopyObject, // do nothing
result_type_id,
id,
arg0_id,
))
}
other => unimplemented!("Unexpected abs({:?})", other),
}
}
Mf::Min => MathOp::Ext(match arg_scalar_kind {
Some(crate::ScalarKind::Float) => spirv::GLOp::FMin,
Some(crate::ScalarKind::Sint) => spirv::GLOp::SMin,
Some(crate::ScalarKind::Uint) => spirv::GLOp::UMin,
other => unimplemented!("Unexpected min({:?})", other),
}),
Mf::Max => MathOp::Ext(match arg_scalar_kind {
Some(crate::ScalarKind::Float) => spirv::GLOp::FMax,
Some(crate::ScalarKind::Sint) => spirv::GLOp::SMax,
Some(crate::ScalarKind::Uint) => spirv::GLOp::UMax,
other => unimplemented!("Unexpected max({:?})", other),
}),
Mf::Clamp => MathOp::Ext(match arg_scalar_kind {
Some(crate::ScalarKind::Float) => spirv::GLOp::FClamp,
Some(crate::ScalarKind::Sint) => spirv::GLOp::SClamp,
Some(crate::ScalarKind::Uint) => spirv::GLOp::UClamp,
other => unimplemented!("Unexpected max({:?})", other),
}),
// trigonometry
Mf::Sin => MathOp::Ext(spirv::GLOp::Sin),
Mf::Sinh => MathOp::Ext(spirv::GLOp::Sinh),
Mf::Asin => MathOp::Ext(spirv::GLOp::Asin),
Mf::Cos => MathOp::Ext(spirv::GLOp::Cos),
Mf::Cosh => MathOp::Ext(spirv::GLOp::Cosh),
Mf::Acos => MathOp::Ext(spirv::GLOp::Acos),
Mf::Tan => MathOp::Ext(spirv::GLOp::Tan),
Mf::Tanh => MathOp::Ext(spirv::GLOp::Tanh),
Mf::Atan => MathOp::Ext(spirv::GLOp::Atan),
Mf::Atan2 => MathOp::Ext(spirv::GLOp::Atan2),
Mf::Asinh => MathOp::Ext(spirv::GLOp::Asinh),
Mf::Acosh => MathOp::Ext(spirv::GLOp::Acosh),
Mf::Atanh => MathOp::Ext(spirv::GLOp::Atanh),
Mf::Radians => MathOp::Ext(spirv::GLOp::Radians),
Mf::Degrees => MathOp::Ext(spirv::GLOp::Degrees),
// decomposition
Mf::Ceil => MathOp::Ext(spirv::GLOp::Ceil),
Mf::Round => MathOp::Ext(spirv::GLOp::RoundEven),
Mf::Floor => MathOp::Ext(spirv::GLOp::Floor),
Mf::Fract => MathOp::Ext(spirv::GLOp::Fract),
Mf::Trunc => MathOp::Ext(spirv::GLOp::Trunc),
Mf::Modf => MathOp::Ext(spirv::GLOp::Modf),
Mf::Frexp => MathOp::Ext(spirv::GLOp::Frexp),
Mf::Ldexp => MathOp::Ext(spirv::GLOp::Ldexp),
// geometry
Mf::Dot => match *self.fun_info[arg].ty.inner_with(&self.ir_module.types) {
crate::TypeInner::Vector {
kind: crate::ScalarKind::Float,
..
} => MathOp::Custom(Instruction::binary(
spirv::Op::Dot,
result_type_id,
id,
arg0_id,
arg1_id,
)),
// TODO: consider using integer dot product if VK_KHR_shader_integer_dot_product is available
crate::TypeInner::Vector { size, .. } => {
self.write_dot_product(
id,
result_type_id,
arg0_id,
arg1_id,
size as u32,
block,
);
self.cached[expr_handle] = id;
return Ok(());
}
_ => unreachable!(
"Correct TypeInner for dot product should be already validated"
),
},
Mf::Outer => MathOp::Custom(Instruction::binary(
spirv::Op::OuterProduct,
result_type_id,
id,
arg0_id,
arg1_id,
)),
Mf::Cross => MathOp::Ext(spirv::GLOp::Cross),
Mf::Distance => MathOp::Ext(spirv::GLOp::Distance),
Mf::Length => MathOp::Ext(spirv::GLOp::Length),
Mf::Normalize => MathOp::Ext(spirv::GLOp::Normalize),
Mf::FaceForward => MathOp::Ext(spirv::GLOp::FaceForward),
Mf::Reflect => MathOp::Ext(spirv::GLOp::Reflect),
Mf::Refract => MathOp::Ext(spirv::GLOp::Refract),
// exponent
Mf::Exp => MathOp::Ext(spirv::GLOp::Exp),
Mf::Exp2 => MathOp::Ext(spirv::GLOp::Exp2),
Mf::Log => MathOp::Ext(spirv::GLOp::Log),
Mf::Log2 => MathOp::Ext(spirv::GLOp::Log2),
Mf::Pow => MathOp::Ext(spirv::GLOp::Pow),
// computational
Mf::Sign => MathOp::Ext(match arg_scalar_kind {
Some(crate::ScalarKind::Float) => spirv::GLOp::FSign,
Some(crate::ScalarKind::Sint) => spirv::GLOp::SSign,
other => unimplemented!("Unexpected sign({:?})", other),
}),
Mf::Fma => MathOp::Ext(spirv::GLOp::Fma),
Mf::Mix => {
let selector = arg2.unwrap();
let selector_ty =
self.fun_info[selector].ty.inner_with(&self.ir_module.types);
match (arg_ty, selector_ty) {
// if the selector is a scalar, we need to splat it
(
&crate::TypeInner::Vector { size, .. },
&crate::TypeInner::Scalar { kind, width },
) => {
let selector_type_id =
self.get_type_id(LookupType::Local(LocalType::Value {
vector_size: Some(size),
kind,
width,
pointer_space: None,
}));
self.temp_list.clear();
self.temp_list.resize(size as usize, arg2_id);
let selector_id = self.gen_id();
block.body.push(Instruction::composite_construct(
selector_type_id,
selector_id,
&self.temp_list,
));
MathOp::Custom(Instruction::ext_inst(
self.writer.gl450_ext_inst_id,
spirv::GLOp::FMix,
result_type_id,
id,
&[arg0_id, arg1_id, selector_id],
))
}
_ => MathOp::Ext(spirv::GLOp::FMix),
}
}
Mf::Step => MathOp::Ext(spirv::GLOp::Step),
Mf::SmoothStep => MathOp::Ext(spirv::GLOp::SmoothStep),
Mf::Sqrt => MathOp::Ext(spirv::GLOp::Sqrt),
Mf::InverseSqrt => MathOp::Ext(spirv::GLOp::InverseSqrt),
Mf::Inverse => MathOp::Ext(spirv::GLOp::MatrixInverse),
Mf::Transpose => MathOp::Custom(Instruction::unary(
spirv::Op::Transpose,
result_type_id,
id,
arg0_id,
)),
Mf::Determinant => MathOp::Ext(spirv::GLOp::Determinant),
Mf::ReverseBits => MathOp::Custom(Instruction::unary(
spirv::Op::BitReverse,
result_type_id,
id,
arg0_id,
)),
Mf::CountOneBits => MathOp::Custom(Instruction::unary(
spirv::Op::BitCount,
result_type_id,
id,
arg0_id,
)),
Mf::ExtractBits => {
let op = match arg_scalar_kind {
Some(crate::ScalarKind::Uint) => spirv::Op::BitFieldUExtract,
Some(crate::ScalarKind::Sint) => spirv::Op::BitFieldSExtract,
other => unimplemented!("Unexpected sign({:?})", other),
};
MathOp::Custom(Instruction::ternary(
op,
result_type_id,
id,
arg0_id,
arg1_id,
arg2_id,
))
}
Mf::InsertBits => MathOp::Custom(Instruction::quaternary(
spirv::Op::BitFieldInsert,
result_type_id,
id,
arg0_id,
arg1_id,
arg2_id,
arg3_id,
)),
Mf::FindLsb => MathOp::Ext(spirv::GLOp::FindILsb),
Mf::FindMsb => MathOp::Ext(match arg_scalar_kind {
Some(crate::ScalarKind::Uint) => spirv::GLOp::FindUMsb,
Some(crate::ScalarKind::Sint) => spirv::GLOp::FindSMsb,
other => unimplemented!("Unexpected findMSB({:?})", other),
}),
Mf::Pack4x8unorm => MathOp::Ext(spirv::GLOp::PackUnorm4x8),
Mf::Pack4x8snorm => MathOp::Ext(spirv::GLOp::PackSnorm4x8),
Mf::Pack2x16float => MathOp::Ext(spirv::GLOp::PackHalf2x16),
Mf::Pack2x16unorm => MathOp::Ext(spirv::GLOp::PackUnorm2x16),
Mf::Pack2x16snorm => MathOp::Ext(spirv::GLOp::PackSnorm2x16),
Mf::Unpack4x8unorm => MathOp::Ext(spirv::GLOp::UnpackUnorm4x8),
Mf::Unpack4x8snorm => MathOp::Ext(spirv::GLOp::UnpackSnorm4x8),
Mf::Unpack2x16float => MathOp::Ext(spirv::GLOp::UnpackHalf2x16),
Mf::Unpack2x16unorm => MathOp::Ext(spirv::GLOp::UnpackUnorm2x16),
Mf::Unpack2x16snorm => MathOp::Ext(spirv::GLOp::UnpackSnorm2x16),
};
block.body.push(match math_op {
MathOp::Ext(op) => Instruction::ext_inst(
self.writer.gl450_ext_inst_id,
op,
result_type_id,
id,
&[arg0_id, arg1_id, arg2_id, arg3_id][..fun.argument_count()],
),
MathOp::Custom(inst) => inst,
});
id
}
crate::Expression::LocalVariable(variable) => self.function.variables[&variable].id,
crate::Expression::Load { pointer } => {
match self.write_expression_pointer(pointer, block, None)? {
ExpressionPointer::Ready { pointer_id } => {
let id = self.gen_id();
let atomic_space =
match *self.fun_info[pointer].ty.inner_with(&self.ir_module.types) {
crate::TypeInner::Pointer { base, space } => {
match self.ir_module.types[base].inner {
crate::TypeInner::Atomic { .. } => Some(space),
_ => None,
}
}
_ => None,
};
let instruction = if let Some(space) = atomic_space {
let (semantics, scope) = space.to_spirv_semantics_and_scope();
let scope_constant_id = self.get_scope_constant(scope as u32);
let semantics_id = self.get_index_constant(semantics.bits());
Instruction::atomic_load(
result_type_id,
id,
pointer_id,
scope_constant_id,
semantics_id,
)
} else {
Instruction::load(result_type_id, id, pointer_id, None)
};
block.body.push(instruction);
id
}
ExpressionPointer::Conditional { condition, access } => {
//TODO: support atomics?
self.write_conditional_indexed_load(
result_type_id,
condition,
block,
move |id_gen, block| {
// The in-bounds path. Perform the access and the load.
let pointer_id = access.result_id.unwrap();
let value_id = id_gen.next();
block.body.push(access);
block.body.push(Instruction::load(
result_type_id,
value_id,
pointer_id,
None,
));
value_id
},
)
}
}
}
crate::Expression::FunctionArgument(index) => self.function.parameter_id(index),
crate::Expression::CallResult(_) | crate::Expression::AtomicResult { .. } => {
self.cached[expr_handle]
}
crate::Expression::As {
expr,
kind,
convert,
} => {
use crate::ScalarKind as Sk;
let expr_id = self.cached[expr];
let (src_kind, src_size, src_width, is_matrix) =
match *self.fun_info[expr].ty.inner_with(&self.ir_module.types) {
crate::TypeInner::Scalar { kind, width } => (kind, None, width, false),
crate::TypeInner::Vector { kind, width, size } => {
(kind, Some(size), width, false)
}
crate::TypeInner::Matrix { width, .. } => (kind, None, width, true),
ref other => {
log::error!("As source {:?}", other);
return Err(Error::Validation("Unexpected Expression::As source"));
}
};
enum Cast {
Unary(spirv::Op),
Binary(spirv::Op, Word),
Ternary(spirv::Op, Word, Word),
}
let cast = if is_matrix {
// we only support identity casts for matrices
Cast::Unary(spirv::Op::CopyObject)
} else {
match (src_kind, kind, convert) {
(Sk::Bool, Sk::Bool, _) => Cast::Unary(spirv::Op::CopyObject),
(_, _, None) => Cast::Unary(spirv::Op::Bitcast),
// casting to a bool - generate `OpXxxNotEqual`
(_, Sk::Bool, Some(_)) => {
let (op, value) = match src_kind {
Sk::Sint => (spirv::Op::INotEqual, crate::ScalarValue::Sint(0)),
Sk::Uint => (spirv::Op::INotEqual, crate::ScalarValue::Uint(0)),
Sk::Float => {
(spirv::Op::FUnordNotEqual, crate::ScalarValue::Float(0.0))
}
Sk::Bool => unreachable!(),
};
let zero_scalar_id = self.writer.get_constant_scalar(value, src_width);
let zero_id = match src_size {