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shader: Enable more Go syntax

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This commit is contained in:
Hajime Hoshi 2020-06-11 00:29:01 +09:00
parent b64dc627e9
commit f39c591252
5 changed files with 125 additions and 6 deletions
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19
examples/shader/main.go
View File

@ -29,6 +29,8 @@ const (
const shaderSrc = `package main
var Time float
// viewportSize is a predefined function.
func Vertex(position vec2, texCoord vec2, color vec4) vec4 {
@ -41,14 +43,22 @@ func Vertex(position vec2, texCoord vec2, color vec4) vec4 {
}
func Fragment(position vec4) vec4 {
return vec4(position.x/viewportSize().x, position.y/viewportSize().y, 0, 1)
pos := position.xy / viewportSize()
color := 0.0
color += sin(pos.x * cos(Time / 15.0) * 80.0) + cos(pos.y * cos(Time / 15.0) * 10.0)
color += sin(pos.y * sin(Time / 10.0) * 40.0) + cos(pos.x * sin(Time / 25.0) * 40.0)
color += sin(pos.x * sin(Time / 5.0) * 10.0) + sin(pos.y * sin(Time / 35.0) * 80.0)
color *= sin(Time / 10.0) * 0.5
return vec4(color, color * 0.5, sin(color + Time / 3.0 ) * 0.75, 1.0)
}`
type Game struct {
shader *ebiten.Shader
time int
}
func (g *Game) Update(screen *ebiten.Image) error {
g.time++
if g.shader == nil {
var err error
g.shader, err = ebiten.NewShader([]byte(shaderSrc))
@ -80,7 +90,12 @@ func (g *Game) Draw(screen *ebiten.Image) {
},
}
is := []uint16{0, 1, 2, 1, 2, 3}
screen.DrawTrianglesWithShader(vs, is, g.shader, nil)
op := &ebiten.DrawTrianglesWithShaderOptions{}
op.Uniforms = []interface{}{
float32(g.time) / 60, // time
}
screen.DrawTrianglesWithShader(vs, is, g.shader, op)
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {

2
internal/graphicsdriver/opengl/program.go
View File

@ -285,7 +285,7 @@ func (g *Graphics) useProgram(program program, uniforms []uniformVariable) error
}
g.context.bindTexture(v)
default:
return fmt.Errorf("opengl: unexpected uniform value: %v", u.value)
return fmt.Errorf("opengl: unexpected uniform value: %v (type: %T)", u.value, u.value)
}
}
return nil

36
internal/shader/shader.go
View File

@ -557,7 +557,9 @@ func (cs *compileState) parseBlock(outer *block, b *ast.BlockStmt, inParams, out
if len(ts) > 1 {
cs.addError(l.Pos(), fmt.Sprintf("single-value context and multiple-value context cannot be mixed"))
}
if len(ts) == 1 {
v.typ = ts[0]
}
} else {
if i == 0 {
rhsTypes = cs.detectType(block, l.Rhs[0])
@ -578,6 +580,40 @@ func (cs *compileState) parseBlock(outer *block, b *ast.BlockStmt, inParams, out
return nil
}
cs.assign(block, l.Pos(), l.Lhs, l.Rhs)
case token.ADD_ASSIGN, token.SUB_ASSIGN, token.MUL_ASSIGN, token.QUO_ASSIGN, token.REM_ASSIGN:
var op shaderir.Op
switch l.Tok {
case token.ADD_ASSIGN:
op = shaderir.Add
case token.SUB_ASSIGN:
op = shaderir.Sub
case token.MUL_ASSIGN:
op = shaderir.Mul
case token.QUO_ASSIGN:
op = shaderir.Div
case token.REM_ASSIGN:
op = shaderir.ModOp
}
rhs, stmts := cs.parseExpr(block, l.Rhs[0])
block.ir.Stmts = append(block.ir.Stmts, stmts...)
lhs, stmts := cs.parseExpr(block, l.Lhs[0])
block.ir.Stmts = append(block.ir.Stmts, stmts...)
block.ir.Stmts = append(block.ir.Stmts, shaderir.Stmt{
Type: shaderir.Assign,
Exprs: []shaderir.Expr{
lhs[0],
{
Type: shaderir.Binary,
Op: op,
Exprs: []shaderir.Expr{
lhs[0],
rhs[0],
},
},
},
})
default:
cs.addError(l.Pos(), fmt.Sprintf("unexpected token: %s", l.Tok))
}
case *ast.BlockStmt:
b := cs.parseBlock(block, l, nil, nil)

54
internal/shader/type.go
View File

@ -72,6 +72,30 @@ func (cs *compileState) detectType(b *block, expr ast.Expr) []shaderir.Type {
}
cs.addError(expr.Pos(), fmt.Sprintf("unexpected literal: %s", e.Value))
return nil
case *ast.BinaryExpr:
t1, t2 := cs.detectType(b, e.X), cs.detectType(b, e.Y)
if len(t1) != 1 || len(t2) != 1 {
cs.addError(expr.Pos(), fmt.Sprintf("binary operator cannot be used for multiple-value context: %v", expr))
return nil
}
if !t1[0].Equal(&t2[0]) {
// TODO: Move this checker to shaderir
if t1[0].Main == shaderir.Float {
switch t2[0].Main {
case shaderir.Vec2, shaderir.Vec3, shaderir.Vec4:
return t2
}
}
if t2[0].Main == shaderir.Float {
switch t1[0].Main {
case shaderir.Vec2, shaderir.Vec3, shaderir.Vec4:
return t1
}
}
cs.addError(expr.Pos(), fmt.Sprintf("types between a binary operator don't match"))
return nil
}
return t1
case *ast.CallExpr:
n := e.Fun.(*ast.Ident).Name
f, ok := shaderir.ParseBuiltinFunc(n)
@ -127,8 +151,34 @@ func (cs *compileState) detectType(b *block, expr ast.Expr) []shaderir.Type {
}
cs.addError(expr.Pos(), fmt.Sprintf("unexpected identifier: %s", n))
return nil
//case *ast.SelectorExpr:
//return fmt.Sprintf("%cs.%s", dumpExpr(e.X), dumpExpr(e.Sel))
case *ast.SelectorExpr:
t := cs.detectType(b, e.X)
if len(t) != 1 {
cs.addError(expr.Pos(), fmt.Sprintf("selector is not available in multiple-value context: %v", e.X))
return nil
}
switch t[0].Main {
case shaderir.Vec2, shaderir.Vec3, shaderir.Vec4:
switch len(e.Sel.Name) {
case 1:
return []shaderir.Type{{Main: shaderir.Float}}
case 2:
return []shaderir.Type{{Main: shaderir.Vec2}}
case 3:
return []shaderir.Type{{Main: shaderir.Float}}
case 4:
return []shaderir.Type{{Main: shaderir.Float}}
default:
cs.addError(expr.Pos(), fmt.Sprintf("invalid selector: %s", e.Sel.Name))
}
return nil
case shaderir.Struct:
cs.addError(expr.Pos(), fmt.Sprintf("selector for a struct is not implemented yet"))
return nil
default:
cs.addError(expr.Pos(), fmt.Sprintf("selector is not available for: %v", expr))
return nil
}
default:
cs.addError(expr.Pos(), fmt.Sprintf("detecting type not implemented: %#v", expr))
return nil

18
internal/shaderir/type.go
View File

@ -25,6 +25,24 @@ type Type struct {
Length int
}
func (t *Type) Equal(rhs *Type) bool {
if t.Main != rhs.Main {
return false
}
if t.Length != rhs.Length {
return false
}
if len(t.Sub) != len(rhs.Sub) {
return false
}
for i, s := range t.Sub {
if !s.Equal(&rhs.Sub[i]) {
return false
}
}
return true
}
func (t *Type) serialize() string {
switch t.Main {
case None: