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shaderir: Bug fix: Early-returns in the entry points didn't work
Fixes #1238
This commit is contained in:
parent
f4a72165e4
commit
98ae0826c7
8
internal/shader/testdata/issue1238.expected.fs
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8
internal/shader/testdata/issue1238.expected.fs
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@ -0,0 +1,8 @@
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void main(void) {
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if (true) {
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gl_FragColor = gl_FragCoord;
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return;
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}
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gl_FragColor = gl_FragCoord;
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return;
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}
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10
internal/shader/testdata/issue1238.expected.vs
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10
internal/shader/testdata/issue1238.expected.vs
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@ -0,0 +1,10 @@
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attribute vec2 A0;
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void main(void) {
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if (true) {
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gl_Position = vec4(A0, 0.0, 1.0);
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return;
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}
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gl_Position = vec4(A0, 0.0, 1.0);
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return;
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}
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15
internal/shader/testdata/issue1238.go
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15
internal/shader/testdata/issue1238.go
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@ -0,0 +1,15 @@
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package main
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func Vertex(position vec2) vec4 {
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if true {
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return vec4(position, 0, 1)
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}
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return vec4(position, 0, 1)
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}
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func Fragment(position vec4) vec4 {
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if true {
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return position
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}
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return position
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}
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@ -99,7 +99,7 @@ func (p *Program) Glsl() (vertexShader, fragmentShader string) {
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vslines = append(vslines, "")
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}
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vslines = append(vslines, "void main(void) {")
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vslines = append(vslines, p.glslBlock(&p.VertexFunc.Block, 0, 0)...)
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vslines = append(vslines, p.glslBlock(&p.VertexFunc.Block, &p.VertexFunc.Block, 0, 0)...)
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vslines = append(vslines, "}")
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}
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}
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@ -118,9 +118,11 @@ func (p *Program) Glsl() (vertexShader, fragmentShader string) {
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}
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if len(p.FragmentFunc.Block.Stmts) > 0 {
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if len(fslines) > 0 {
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fslines = append(fslines, "")
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}
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fslines = append(fslines, "void main(void) {")
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fslines = append(fslines, p.glslBlock(&p.FragmentFunc.Block, 0, 0)...)
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fslines = append(fslines, p.glslBlock(&p.FragmentFunc.Block, &p.FragmentFunc.Block, 0, 0)...)
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fslines = append(fslines, "}")
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}
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}
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@ -217,17 +219,17 @@ func (p *Program) glslFunc(f *Func) []string {
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var lines []string
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lines = append(lines, fmt.Sprintf("%s F%d(%s) {", p.glslType(&f.Return), f.Index, argsstr))
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lines = append(lines, p.glslBlock(&f.Block, 0, idx)...)
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lines = append(lines, p.glslBlock(&f.Block, &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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func (p *Program) glslBlock(topBlock, block *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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for _, t := range block.LocalVars {
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lines = append(lines, fmt.Sprintf("%s%s = %s;", idt, p.glslVarDecl(&t, fmt.Sprintf("l%d", localVarIndex)), p.glslVarInit(&t)))
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localVarIndex++
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}
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@ -265,7 +267,7 @@ func (p *Program) glslBlock(b *Block, level int, localVarIndex int) []string {
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return fmt.Sprintf("U%d", e.Index)
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case LocalVariable:
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idx := e.Index
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switch b {
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switch topBlock {
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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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@ -334,23 +336,23 @@ func (p *Program) glslBlock(b *Block, level int, localVarIndex int) []string {
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}
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}
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for _, s := range b.Stmts {
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for _, s := range block.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, p.glslBlock(topBlock, &s.Blocks[0], level+1, localVarIndex)...)
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lines = append(lines, idt+"}")
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case Assign:
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// TODO: Give an appropriate context
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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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lines = append(lines, p.glslBlock(topBlock, &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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lines = append(lines, p.glslBlock(topBlock, &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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@ -379,7 +381,7 @@ func (p *Program) glslBlock(b *Block, level int, localVarIndex int) []string {
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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, p.glslBlock(topBlock, &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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