ebiten/internal/shaderir/reachable_test.go

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// Copyright 2022 The Ebitengine Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package shaderir_test
import (
"sort"
"testing"
"github.com/hajimehoshi/ebiten/v2/internal/shader"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
)
func compileToIR(src []byte) (*shaderir.Program, error) {
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return shader.Compile(src, "Vertex", "Fragment", 0)
}
func areIntSlicesEqual(a, b []int) bool {
if len(a) != len(b) {
return false
}
for i := range a {
if a[i] != b[i] {
return false
}
}
return true
}
func TestReachableUniformVariablesFromBlock(t *testing.T) {
src0 := `package main
var U0 float
var U1 float
func F0() float {
return U0
}
func F1() {
a := U0
_ = a
}
func F2() {
}
func F3() float {
return F0()
}
func F4() float {
return F0() + U1
}
func neverCalled() float {
return U0 + U1
}
`
cases := []struct {
source string
index int
expected []int
}{
{
source: src0,
index: 0,
expected: []int{0},
},
{
source: src0,
index: 1,
expected: []int{0},
},
{
source: src0,
index: 2,
expected: []int{},
},
{
source: src0,
index: 3,
expected: []int{0},
},
{
source: src0,
index: 4,
expected: []int{0, 1},
},
}
for _, c := range cases {
ir, err := compileToIR([]byte(c.source))
if err != nil {
t.Fatal(err)
}
got := ir.AppendReachableUniformVariablesFromBlock(nil, ir.Funcs[c.index].Block)
sort.Ints(got)
want := c.expected
if !areIntSlicesEqual(got, want) {
t.Errorf("test: %v, got: %v, want: %v", c, got, want)
}
}
}