mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-12 22:17:26 +01:00
88 lines
2.3 KiB
Go
88 lines
2.3 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 shaderir
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import (
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"fmt"
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"strings"
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)
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func (p *Program) structName(t *Type) string {
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if t.Main != Struct {
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panic("shaderir: the given type at structName must be a struct")
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}
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s := t.serialize()
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if n, ok := p.structNames[s]; ok {
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return n
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}
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n := fmt.Sprintf("S%d", len(p.structNames))
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p.structNames[s] = n
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p.structTypes = append(p.structTypes, *t)
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return n
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}
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func (p *Program) Glsl() string {
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p.structNames = map[string]string{}
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p.structTypes = nil
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var lines []string
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for _, u := range p.Uniforms {
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lines = append(lines, fmt.Sprintf("uniform %s;", p.glslVarDecl(&u.Type, u.Name)))
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}
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for _, a := range p.Attributes {
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lines = append(lines, fmt.Sprintf("attribute %s;", p.glslVarDecl(&a.Type, a.Name)))
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}
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for _, v := range p.Varyings {
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lines = append(lines, fmt.Sprintf("varying %s;", p.glslVarDecl(&v.Type, v.Name)))
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}
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for _, f := range p.Funcs {
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lines = append(lines, p.glslFunc(&f)...)
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}
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var stLines []string
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for i, t := range p.structTypes {
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stLines = append(stLines, fmt.Sprintf("struct S%d {", i))
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for j, st := range t.Sub {
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stLines = append(stLines, fmt.Sprintf("\t%s;", p.glslVarDecl(&st, fmt.Sprintf("M%d", j))))
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}
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stLines = append(stLines, "};")
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}
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lines = append(stLines, lines...)
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return strings.Join(lines, "\n") + "\n"
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}
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func (p *Program) glslVarDecl(t *Type, varname string) string {
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switch t.Main {
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case None:
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return "?(none)"
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case Image2D:
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panic("not implemented")
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case Array:
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panic("not implemented")
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case Struct:
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return fmt.Sprintf("%s %s", p.structName(t), varname)
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default:
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return fmt.Sprintf("%s %s", t.Main.Glsl(), varname)
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}
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}
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func (p *Program) glslFunc(f *Func) []string {
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return []string{
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fmt.Sprintf(`void %s(void) {`, f.Name),
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`}`,
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}
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}
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