transform/EmitVertexPointSize: Handle entry point parameters
Generate a new struct that contains members of the original return type with the point size appended to it, and replace return statements as necessary. The SPIR-V sanitizer then special-cases this builtin when handling entry point IO to always use a RHS which is a literal. Fixed: tint:732 Change-Id: Id718632a5e671f3e7c82a304f5bc1fc223a6c8ee Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/49440 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Ben Clayton <bclayton@google.com> Commit-Queue: James Price <jrprice@google.com> Auto-Submit: James Price <jrprice@google.com>
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parent
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commit
e6307e5100
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@ -14,10 +14,13 @@
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#include "src/transform/emit_vertex_point_size.h"
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#include <unordered_map>
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#include <utility>
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#include "src/ast/assignment_statement.h"
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#include "src/program_builder.h"
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#include "src/sem/function.h"
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#include "src/sem/statement.h"
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#include "src/utils/get_or_create.h"
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namespace tint {
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namespace transform {
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@ -26,34 +29,85 @@ EmitVertexPointSize::EmitVertexPointSize() = default;
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EmitVertexPointSize::~EmitVertexPointSize() = default;
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Output EmitVertexPointSize::Run(const Program* in, const DataMap&) {
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if (!in->AST().Functions().HasStage(ast::PipelineStage::kVertex)) {
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// If the module doesn't have any vertex stages, then there's nothing to do.
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return Output(Program(in->Clone()));
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}
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ProgramBuilder out;
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CloneContext ctx(&out, in);
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Symbol pointsize = out.Symbols().New("tint_pointsize");
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// Declare the pointsize builtin output variable.
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out.Global(pointsize, out.ty.f32(), ast::StorageClass::kOutput, nullptr,
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ast::DecorationList{
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out.Builtin(ast::Builtin::kPointSize),
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});
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// Add the pointsize assignment statement to the front of all vertex stages.
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ctx.ReplaceAll([&](ast::Function* func) -> ast::Function* {
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std::unordered_map<sem::Type*, sem::StructType*> struct_map;
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for (auto* func : in->AST().Functions()) {
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if (func->pipeline_stage() != ast::PipelineStage::kVertex) {
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return nullptr; // Just clone func
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continue;
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}
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return CloneWithStatementsAtStart(&ctx, func,
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{
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out.Assign(pointsize, 1.0f),
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});
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});
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auto* sem_func = in->Sem().Get(func);
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// Create a struct for the return type that includes a point size member.
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auto* new_struct =
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utils::GetOrCreate(struct_map, sem_func->ReturnType(), [&]() {
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// Gather struct members.
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ast::StructMemberList new_struct_members;
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if (auto* struct_ty = sem_func->ReturnType()->As<sem::StructType>()) {
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for (auto* member : struct_ty->impl()->members()) {
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new_struct_members.push_back(ctx.Clone(member));
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}
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} else {
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auto* ret_type = ctx.Clone(sem_func->ReturnType());
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auto ret_type_decos = ctx.Clone(func->return_type_decorations());
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new_struct_members.push_back(
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out.Member("position", ret_type, std::move(ret_type_decos)));
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}
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// Append a new member for the point size.
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new_struct_members.push_back(
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out.Member(out.Symbols().New("tint_pointsize"), out.ty.f32(),
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{out.Builtin(ast::Builtin::kPointSize)}));
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// Create the new output struct.
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return out.Structure(out.Sym(), new_struct_members);
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});
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// Replace return values using new output struct type constructors.
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for (auto* ret : sem_func->ReturnStatements()) {
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auto* ret_sem = in->Sem().Get(ret);
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ast::ExpressionList new_ret_values;
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if (auto* struct_ty = sem_func->ReturnType()->As<sem::StructType>()) {
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std::function<ast::Expression*()> ret_value = [&]() {
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return ctx.Clone(ret->value());
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};
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if (!ret->value()->Is<ast::IdentifierExpression>()) {
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// Capture the original return value in a local temporary.
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auto* new_struct_ty = ctx.Clone(struct_ty);
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auto* temp = out.Const(out.Sym(), new_struct_ty, ret_value());
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ctx.InsertBefore(ret_sem->Block()->statements(), ret, out.Decl(temp));
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ret_value = [&, temp]() { return out.Expr(temp); };
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}
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for (auto* member : struct_ty->impl()->members()) {
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auto member_sym = ctx.Clone(member->symbol());
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new_ret_values.push_back(out.MemberAccessor(ret_value(), member_sym));
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}
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} else {
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new_ret_values.push_back(ctx.Clone(ret->value()));
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}
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// Append the point size and replace the return statement.
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new_ret_values.push_back(out.Expr(1.f));
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ctx.Replace(ret, out.Return(ret->source(),
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out.Construct(new_struct, new_ret_values)));
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}
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// Rewrite the function header with the new return type.
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auto func_sym = ctx.Clone(func->symbol());
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auto params = ctx.Clone(func->params());
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auto* body = ctx.Clone(func->body());
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auto decos = ctx.Clone(func->decorations());
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auto* new_func = out.create<ast::Function>(
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func->source(), func_sym, std::move(params), new_struct, body,
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std::move(decos), ast::DecorationList{});
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ctx.Replace(func, new_func);
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}
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ctx.Clone();
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return Output(Program(std::move(out)));
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@ -29,7 +29,6 @@ fn non_entry_a() {
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[[stage(vertex)]]
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fn entry() -> [[builtin(position)]] vec4<f32> {
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var builtin_assignments_should_happen_before_this : f32;
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return vec4<f32>();
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}
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@ -38,16 +37,19 @@ fn non_entry_b() {
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)";
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auto* expect = R"(
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[[builtin(pointsize)]] var<out> tint_pointsize : f32;
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struct tint_symbol {
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[[builtin(position)]]
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position : vec4<f32>;
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[[builtin(pointsize)]]
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tint_pointsize : f32;
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};
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fn non_entry_a() {
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}
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[[stage(vertex)]]
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fn entry() -> [[builtin(position)]] vec4<f32> {
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tint_pointsize = 1.0;
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var builtin_assignments_should_happen_before_this : f32;
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return vec4<f32>();
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fn entry() -> tint_symbol {
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return tint_symbol(vec4<f32>(), 1.0);
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}
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fn non_entry_b() {
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@ -59,6 +61,255 @@ fn non_entry_b() {
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EXPECT_EQ(expect, str(got));
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}
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TEST_F(EmitVertexPointSizeTest, VertexStageBasic_Struct) {
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auto* src = R"(
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struct VertexOut {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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};
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fn non_entry_a() {
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}
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[[stage(vertex)]]
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fn entry() -> VertexOut {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.5;
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return output;
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}
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fn non_entry_b() {
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}
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)";
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auto* expect = R"(
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struct tint_symbol {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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[[builtin(pointsize)]]
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tint_pointsize : f32;
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};
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struct VertexOut {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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};
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fn non_entry_a() {
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}
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[[stage(vertex)]]
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fn entry() -> tint_symbol {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.5;
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return tint_symbol(output.pos, output.col, 1.0);
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}
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fn non_entry_b() {
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}
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)";
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auto got = Run<EmitVertexPointSize>(src);
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EXPECT_EQ(expect, str(got));
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}
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// Make sure we capture the function return value in a temporary instead of
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// re-evaluating it multiple times.
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TEST_F(EmitVertexPointSizeTest, VertexStage_ReturnStructFromFunctionCall) {
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auto* src = R"(
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struct VertexOut {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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};
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fn foo() -> VertexOut {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.5;
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return output;
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}
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[[stage(vertex)]]
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fn entry() -> VertexOut {
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return foo();
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}
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)";
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auto* expect = R"(
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struct tint_symbol {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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[[builtin(pointsize)]]
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tint_pointsize : f32;
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};
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struct VertexOut {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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};
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fn foo() -> VertexOut {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.5;
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return output;
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}
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[[stage(vertex)]]
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fn entry() -> tint_symbol {
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let tint_symbol_1 : VertexOut = foo();
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return tint_symbol(tint_symbol_1.pos, tint_symbol_1.col, 1.0);
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}
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)";
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auto got = Run<EmitVertexPointSize>(src);
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EXPECT_EQ(expect, str(got));
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}
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TEST_F(EmitVertexPointSizeTest, VertexStage_MultipleReturnStatements) {
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auto* src = R"(
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[[stage(vertex)]]
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fn entry([[location(0)]] toggle : u32) -> [[builtin(position)]] vec4<f32> {
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if (toggle == 1u) {
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return vec4<f32>(0.5, 0.5, 0.5, 0.5);
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}
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return vec4<f32>(1.0, 1.0, 1.0, 1.0);
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}
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)";
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auto* expect = R"(
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struct tint_symbol {
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[[builtin(position)]]
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position : vec4<f32>;
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[[builtin(pointsize)]]
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tint_pointsize : f32;
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};
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[[stage(vertex)]]
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fn entry([[location(0)]] toggle : u32) -> tint_symbol {
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if ((toggle == 1u)) {
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return tint_symbol(vec4<f32>(0.5, 0.5, 0.5, 0.5), 1.0);
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}
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return tint_symbol(vec4<f32>(1.0, 1.0, 1.0, 1.0), 1.0);
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}
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)";
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auto got = Run<EmitVertexPointSize>(src);
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EXPECT_EQ(expect, str(got));
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}
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// Test that we re-use generated structures when we've seen the original return
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// type before.
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TEST_F(EmitVertexPointSizeTest, VertexStage_MultipleShaders) {
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auto* src = R"(
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struct VertexOut {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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};
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[[stage(vertex)]]
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fn entry1() -> [[builtin(position)]] vec4<f32> {
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return vec4<f32>();
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}
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[[stage(vertex)]]
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fn entry2() -> [[builtin(position)]] vec4<f32> {
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return vec4<f32>(1.0, 1.0, 1.0, 1.0);
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}
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[[stage(vertex)]]
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fn entry3() -> VertexOut {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.5;
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return output;
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}
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[[stage(vertex)]]
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fn entry4() -> VertexOut {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.75;
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return output;
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}
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)";
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auto* expect = R"(
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struct tint_symbol {
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[[builtin(position)]]
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position : vec4<f32>;
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[[builtin(pointsize)]]
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tint_pointsize : f32;
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};
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struct tint_symbol_1 {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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[[builtin(pointsize)]]
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tint_pointsize_1 : f32;
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};
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struct VertexOut {
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[[builtin(position)]]
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pos : vec4<f32>;
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[[location(0)]]
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col : f32;
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};
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[[stage(vertex)]]
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fn entry1() -> tint_symbol {
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return tint_symbol(vec4<f32>(), 1.0);
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}
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[[stage(vertex)]]
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fn entry2() -> tint_symbol {
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return tint_symbol(vec4<f32>(1.0, 1.0, 1.0, 1.0), 1.0);
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}
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[[stage(vertex)]]
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fn entry3() -> tint_symbol_1 {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.5;
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return tint_symbol_1(output.pos, output.col, 1.0);
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}
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[[stage(vertex)]]
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fn entry4() -> tint_symbol_1 {
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var output : VertexOut;
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output.pos = vec4<f32>();
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output.col = 0.75;
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return tint_symbol_1(output.pos, output.col, 1.0);
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}
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)";
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auto got = Run<EmitVertexPointSize>(src);
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EXPECT_EQ(expect, str(got));
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}
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TEST_F(EmitVertexPointSizeTest, NonVertexStage) {
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auto* src = R"(
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[[stage(fragment)]]
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@ -87,21 +338,34 @@ fn compute_entry() {
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TEST_F(EmitVertexPointSizeTest, AttemptSymbolCollision) {
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auto* src = R"(
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struct VertexOut {
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[[builtin(position)]]
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tint_pointsize : vec4<f32>;
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};
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[[stage(vertex)]]
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fn entry() -> [[builtin(position)]] vec4<f32> {
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var tint_pointsize : f32;
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return vec4<f32>();
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fn entry() -> VertexOut {
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return VertexOut(vec4<f32>());
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}
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)";
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auto* expect = R"(
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[[builtin(pointsize)]] var<out> tint_pointsize_1 : f32;
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struct tint_symbol {
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[[builtin(position)]]
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tint_pointsize : vec4<f32>;
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[[builtin(pointsize)]]
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tint_pointsize_1 : f32;
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};
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struct VertexOut {
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[[builtin(position)]]
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tint_pointsize : vec4<f32>;
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};
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[[stage(vertex)]]
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fn entry() -> [[builtin(position)]] vec4<f32> {
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tint_pointsize_1 = 1.0;
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var tint_pointsize : f32;
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return vec4<f32>();
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fn entry() -> tint_symbol {
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let tint_symbol_1 : VertexOut = VertexOut(vec4<f32>());
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return tint_symbol(tint_symbol_1.tint_pointsize, 1.0);
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}
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)";
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@ -321,6 +321,20 @@ void Spirv::HoistToOutputVariables(CloneContext& ctx,
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ast::StorageClass::kOutput, nullptr, new_decorations);
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ctx.InsertBefore(ctx.src->AST().GlobalDeclarations(), func, global_var);
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// Special case for PointSize. The EmitVertexPointSize transform will
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// produce a struct containing a member with the [[builtin(pointsize)]]
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// attribute. The SPIR-V reader currently requires that a variable decorated
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// with PointSize is assigned a _literal_ 1.0 value, so generate that
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// assignment here to prevent the RHS from using a non-literal expression.
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if (auto* builtin =
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ast::GetDecoration<ast::BuiltinDecoration>(new_decorations)) {
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if (builtin->value() == ast::Builtin::kPointSize) {
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stores.push_back(ctx.dst->Assign(ctx.dst->Expr(global_var_symbol),
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ctx.dst->Expr(1.f)));
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return;
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}
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}
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// Create the assignment instruction.
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ast::Expression* rhs = ctx.dst->Expr(store_value);
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for (auto member : member_accesses) {
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@ -294,6 +294,99 @@ OpFunctionEnd
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Validate(b);
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||||
}
|
||||
|
||||
// Test that stores to the PointSize builtin have an RHS which is constant 1.0.
|
||||
TEST_F(BuilderTest, EntryPoint_ReturnPointSize) {
|
||||
// struct VertexOut {
|
||||
// [[builtin(position)]] pos : vec4<f32>;
|
||||
// [[builtin(pointsize)]] pointsize : f32;
|
||||
// };
|
||||
//
|
||||
// [[stage(vertex)]]
|
||||
// fn vert_main() -> VertexOutput {
|
||||
// if (false) {
|
||||
// return VertexOutput(vec4<f32>(), 1.0);
|
||||
// }
|
||||
// return VertexOutput(vec4<f32>(1.0, 2.0, 3.0, 0.0), 1.0);
|
||||
// }
|
||||
auto vertex_out = Structure(
|
||||
"VertexOut",
|
||||
{
|
||||
Member("pos", ty.vec4<f32>(), {Builtin(ast::Builtin::kPosition)}),
|
||||
Member("pointsize", ty.f32(), {Builtin(ast::Builtin::kPointSize)}),
|
||||
});
|
||||
Func("vert_main", {}, vertex_out,
|
||||
{
|
||||
If(Expr(false), Block(Return(Construct(
|
||||
vertex_out, Construct(ty.vec4<f32>()), 1.f)))),
|
||||
Return(Construct(
|
||||
vertex_out, Construct(ty.vec4<f32>(), 1.f, 2.f, 3.f, 0.f), 1.f)),
|
||||
},
|
||||
{Stage(ast::PipelineStage::kVertex)});
|
||||
|
||||
spirv::Builder& b = SanitizeAndBuild();
|
||||
|
||||
ASSERT_TRUE(b.Build());
|
||||
|
||||
EXPECT_EQ(DumpBuilder(b), R"(OpCapability Shader
|
||||
OpMemoryModel Logical GLSL450
|
||||
OpEntryPoint Vertex %18 "vert_main" %1 %6
|
||||
OpName %1 "tint_symbol_1"
|
||||
OpName %6 "tint_symbol_2"
|
||||
OpName %11 "VertexOut"
|
||||
OpMemberName %11 0 "pos"
|
||||
OpMemberName %11 1 "pointsize"
|
||||
OpName %12 "tint_symbol_3"
|
||||
OpName %13 "tint_symbol"
|
||||
OpName %18 "vert_main"
|
||||
OpDecorate %1 BuiltIn Position
|
||||
OpDecorate %6 BuiltIn PointSize
|
||||
OpMemberDecorate %11 0 Offset 0
|
||||
OpMemberDecorate %11 1 Offset 16
|
||||
%4 = OpTypeFloat 32
|
||||
%3 = OpTypeVector %4 4
|
||||
%2 = OpTypePointer Output %3
|
||||
%5 = OpConstantNull %3
|
||||
%1 = OpVariable %2 Output %5
|
||||
%7 = OpTypePointer Output %4
|
||||
%8 = OpConstantNull %4
|
||||
%6 = OpVariable %7 Output %8
|
||||
%10 = OpTypeVoid
|
||||
%11 = OpTypeStruct %3 %4
|
||||
%9 = OpTypeFunction %10 %11
|
||||
%16 = OpConstant %4 1
|
||||
%17 = OpTypeFunction %10
|
||||
%20 = OpTypeBool
|
||||
%21 = OpConstantFalse %20
|
||||
%25 = OpConstantComposite %11 %5 %16
|
||||
%27 = OpConstant %4 2
|
||||
%28 = OpConstant %4 3
|
||||
%29 = OpConstant %4 0
|
||||
%30 = OpConstantComposite %3 %16 %27 %28 %29
|
||||
%31 = OpConstantComposite %11 %30 %16
|
||||
%12 = OpFunction %10 None %9
|
||||
%13 = OpFunctionParameter %11
|
||||
%14 = OpLabel
|
||||
%15 = OpCompositeExtract %3 %13 0
|
||||
OpStore %1 %15
|
||||
OpStore %6 %16
|
||||
OpReturn
|
||||
OpFunctionEnd
|
||||
%18 = OpFunction %10 None %17
|
||||
%19 = OpLabel
|
||||
OpSelectionMerge %22 None
|
||||
OpBranchConditional %21 %23 %22
|
||||
%23 = OpLabel
|
||||
%24 = OpFunctionCall %10 %12 %25
|
||||
OpReturn
|
||||
%22 = OpLabel
|
||||
%26 = OpFunctionCall %10 %12 %31
|
||||
OpReturn
|
||||
OpFunctionEnd
|
||||
)");
|
||||
|
||||
Validate(b);
|
||||
}
|
||||
|
||||
} // namespace
|
||||
} // namespace spirv
|
||||
} // namespace writer
|
||||
|
|
|
|||
Loading…
Reference in New Issue