ebiten/shader_test.go

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// Copyright 2020 The Ebiten 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 ebiten_test
import (
"image/color"
"testing"
. "github.com/hajimehoshi/ebiten"
)
func TestShaderFill(t *testing.T) {
const w, h = 16, 16
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dst, _ := NewImage(w, h, FilterDefault)
s, err := NewShader([]byte(`package main
func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
return vec4(1, 0, 0, 1)
}
`))
if err != nil {
t.Fatal(err)
}
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dst.DrawRectShader(w/2, h/2, s, nil)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := dst.At(i, j).(color.RGBA)
var want color.RGBA
if i < w/2 && j < h/2 {
want = color.RGBA{0xff, 0, 0, 0xff}
}
if got != want {
t.Errorf("dst.At(%d, %d): got: %v, want: %v", i, j, got, want)
}
}
}
}
func TestShaderFillWithDrawImage(t *testing.T) {
const w, h = 16, 16
dst, _ := NewImage(w, h, FilterDefault)
s, err := NewShader([]byte(`package main
func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
return vec4(1, 0, 0, 1)
}
`))
if err != nil {
t.Fatal(err)
}
src, _ := NewImage(w/2, h/2, FilterDefault)
op := &DrawImageOptions{}
op.Shader = s
dst.DrawImage(src, op)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := dst.At(i, j).(color.RGBA)
var want color.RGBA
if i < w/2 && j < h/2 {
want = color.RGBA{0xff, 0, 0, 0xff}
}
if got != want {
t.Errorf("dst.At(%d, %d): got: %v, want: %v", i, j, got, want)
}
}
}
}