mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
286 lines
8.0 KiB
Go
286 lines
8.0 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 i, t := range p.Uniforms {
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lines = append(lines, fmt.Sprintf("uniform %s;", p.glslVarDecl(&t, fmt.Sprintf("U%d", i))))
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}
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for i, t := range p.Attributes {
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lines = append(lines, fmt.Sprintf("attribute %s;", p.glslVarDecl(&t, fmt.Sprintf("A%d", i))))
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}
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for i, t := range p.Varyings {
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lines = append(lines, fmt.Sprintf("varying %s;", p.glslVarDecl(&t, fmt.Sprintf("V%d", i))))
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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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// Vertex func
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if len(p.VertexFunc.Block.Stmts) > 0 {
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lines = append(lines, "void main(void) {")
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lines = append(lines, p.glslBlock(&p.VertexFunc.Block, 0, 0)...)
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lines = append(lines, "}")
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}
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// Fragment func
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if len(p.FragmentFunc.Block.Stmts) > 0 {
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lines = append(lines, "void main(void) {")
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lines = append(lines, p.glslBlock(&p.FragmentFunc.Block, 0, 0)...)
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lines = append(lines, "}")
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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) glslType(t *Type) string {
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switch t.Main {
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case None:
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return "void"
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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 p.structName(t)
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default:
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return t.Main.Glsl()
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}
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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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var args []string
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var idx int
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for _, t := range f.InParams {
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args = append(args, "in "+p.glslVarDecl(&t, fmt.Sprintf("l%d", idx)))
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idx++
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}
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for _, t := range f.InOutParams {
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args = append(args, "inout "+p.glslVarDecl(&t, fmt.Sprintf("l%d", idx)))
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idx++
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}
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for _, t := range f.OutParams {
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args = append(args, "out "+p.glslVarDecl(&t, fmt.Sprintf("l%d", idx)))
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idx++
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}
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argsstr := "void"
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if len(args) > 0 {
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argsstr = strings.Join(args, ", ")
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}
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var lines []string
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lines = append(lines, fmt.Sprintf("%s %s(%s) {", p.glslType(&f.Return), f.Name, argsstr))
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lines = append(lines, p.glslBlock(&f.Block, 0, idx)...)
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lines = append(lines, "}")
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return lines
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}
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func (p *Program) glslBlock(b *Block, level int, localVarIndex int) []string {
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idt := strings.Repeat("\t", level+1)
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var lines []string
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for _, t := range b.LocalVars {
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lines = append(lines, fmt.Sprintf("%s%s;", idt, p.glslVarDecl(&t, fmt.Sprintf("l%d", localVarIndex))))
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localVarIndex++
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}
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var glslExpr func(e *Expr) string
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glslExpr = func(e *Expr) string {
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switch e.Type {
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case IntExpr:
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return fmt.Sprintf("%d", e.Int)
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case FloatExpr:
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return fmt.Sprintf("%.9e", e.Float)
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case VarName:
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switch e.Variable.Type {
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case Uniform:
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return fmt.Sprintf("U%d", e.Variable.Index)
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case Local:
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idx := e.Variable.Index
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switch b {
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case &p.VertexFunc.Block:
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na := len(p.Attributes)
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nv := len(p.Varyings)
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switch {
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case idx < na:
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return fmt.Sprintf("A%d", idx)
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case idx < na+nv:
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return fmt.Sprintf("V%d", idx-na)
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case idx == na+nv:
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return "gl_Position"
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default:
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return fmt.Sprintf("l%d", idx-(na+nv+1))
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}
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case &p.FragmentFunc.Block:
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nv := len(p.Varyings)
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switch {
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case idx < nv:
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return fmt.Sprintf("V%d", idx)
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case idx == nv:
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return "gl_FragCoord"
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default:
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return fmt.Sprintf("l%d", idx-(nv+1))
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}
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default:
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return fmt.Sprintf("l%d", idx)
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}
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default:
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return fmt.Sprintf("?(unexpected variable type: %d)", e.Variable.Type)
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}
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case Ident:
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return e.Ident
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case Unary:
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var op string
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switch e.Op {
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case Add, Sub, Neg:
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op = string(e.Op)
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default:
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op = fmt.Sprintf("?(unexpected op: %s)", string(e.Op))
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}
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return fmt.Sprintf("%s(%s)", op, glslExpr(&e.Exprs[0]))
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case Binary:
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return fmt.Sprintf("(%s) %s (%s)", glslExpr(&e.Exprs[0]), e.Op, glslExpr(&e.Exprs[1]))
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case Selection:
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return fmt.Sprintf("(%s) ? (%s) : (%s)", glslExpr(&e.Exprs[0]), glslExpr(&e.Exprs[1]), glslExpr(&e.Exprs[2]))
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case Call:
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var args []string
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for _, exp := range e.Exprs {
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args = append(args, glslExpr(&exp))
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}
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return fmt.Sprintf("%s(%s)", e.Ident, strings.Join(args, ", "))
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case FieldSelector:
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return fmt.Sprintf("(%s).%s", glslExpr(&e.Exprs[0]), glslExpr(&e.Exprs[1]))
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case Index:
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return fmt.Sprintf("(%s)[%s]", glslExpr(&e.Exprs[0]), glslExpr(&e.Exprs[1]))
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default:
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return fmt.Sprintf("?(unexpected expr: %d)", e.Type)
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}
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}
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for _, s := range b.Stmts {
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switch s.Type {
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case ExprStmt:
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lines = append(lines, fmt.Sprintf("%s%s;", idt, glslExpr(&s.Exprs[0])))
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case BlockStmt:
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lines = append(lines, idt+"{")
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lines = append(lines, p.glslBlock(&s.Blocks[0], level+1, localVarIndex)...)
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lines = append(lines, idt+"}")
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case Assign:
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lines = append(lines, fmt.Sprintf("%s%s = %s;", idt, glslExpr(&s.Exprs[0]), glslExpr(&s.Exprs[1])))
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case If:
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lines = append(lines, fmt.Sprintf("%sif (%s) {", idt, glslExpr(&s.Exprs[0])))
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lines = append(lines, p.glslBlock(&s.Blocks[0], level+1, localVarIndex)...)
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if len(s.Blocks) > 1 {
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lines = append(lines, fmt.Sprintf("%s} else {", idt))
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lines = append(lines, p.glslBlock(&s.Blocks[1], level+1, localVarIndex)...)
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}
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lines = append(lines, fmt.Sprintf("%s}", idt))
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case For:
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v := localVarIndex
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localVarIndex++
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var delta string
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switch s.ForDelta {
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case 0:
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delta = fmt.Sprintf("?(unexpected delta: %d)", s.ForDelta)
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case 1:
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delta = fmt.Sprintf("l%d++", v)
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case -1:
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delta = fmt.Sprintf("l%d--", v)
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default:
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if s.ForDelta > 0 {
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delta = fmt.Sprintf("l%d += %d", v, s.ForDelta)
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} else {
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delta = fmt.Sprintf("l%d -= %d", v, -s.ForDelta)
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}
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}
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var op string
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switch s.ForOp {
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case LessThan, LessEqual, GreaterThan, GreaterEqual, Equal, NotEqual:
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op = string(s.ForOp)
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default:
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op = fmt.Sprintf("?(unexpected op: %s)", string(s.ForOp))
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}
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lines = append(lines, fmt.Sprintf("%sfor (int l%d = %d; l%d %s %d; %s) {", idt, v, s.ForInit, v, op, s.ForEnd, delta))
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lines = append(lines, p.glslBlock(&s.Blocks[0], level+1, localVarIndex)...)
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lines = append(lines, fmt.Sprintf("%s}", idt))
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case Continue:
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lines = append(lines, idt+"continue;")
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case Break:
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lines = append(lines, idt+"break;")
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case Return:
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if len(s.Exprs) == 0 {
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lines = append(lines, idt+"return;")
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} else {
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lines = append(lines, fmt.Sprintf("%sreturn %s;", idt, glslExpr(&s.Exprs[0])))
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}
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case Discard:
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lines = append(lines, idt+"discard;")
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default:
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lines = append(lines, fmt.Sprintf("%s?(unexpected stmt: %d)", idt, s.Type))
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}
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}
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return lines
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}
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