mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 11:48:55 +01:00
61 lines
1.7 KiB
Go
61 lines
1.7 KiB
Go
// Copyright 2020 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package testing
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import (
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"fmt"
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"strings"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
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"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
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)
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// ShaderProgramFill returns a shader source to fill the frambuffer.
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func ShaderProgramFill(r, g, b, a byte) *shaderir.Program {
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ir, err := graphics.CompileShader([]byte(fmt.Sprintf(`package main
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func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
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return vec4(%0.9f, %0.9f, %0.9f, %0.9f)
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}
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`, float64(r)/0xff, float64(g)/0xff, float64(b)/0xff, float64(a)/0xff)))
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if err != nil {
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panic(err)
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}
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return ir
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}
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// ShaderProgramImages returns a shader source to render the frambuffer with the given images.
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func ShaderProgramImages(numImages int) *shaderir.Program {
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if numImages <= 0 {
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panic("testing: numImages must be >= 1")
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}
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var exprs []string
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for i := 0; i < numImages; i++ {
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exprs = append(exprs, fmt.Sprintf("imageSrc%dUnsafeAt(texCoord)", i))
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}
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ir, err := graphics.CompileShader([]byte(fmt.Sprintf(`package main
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func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
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return %s
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}
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`, strings.Join(exprs, " + "))))
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if err != nil {
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panic(err)
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}
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return ir
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}
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