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[qfcc] Implement discard

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I had no idea how to do it back when I started working on the glsl
parser, but intrinsics made it very easy. It's just OpKill for now (and
might stay that way for glsl).
This commit is contained in:
Bill Currie 2025-02-17 20:58:45 +09:00
parent 6b0b1b24b8
commit 6af960cef2
3 changed files with 8 additions and 2 deletions
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1
tools/qfcc/source/glsl-builtins.c
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@ -1128,6 +1128,7 @@ SRC_LINE
//fragment processing functions
static const char *glsl_fragment_functions =
SRC_LINE
"void __discard() = " SPV(OpKill) ";" "\n"
"@generic(genFType=@vector(float)) {" "\n"
"genFType dFdx(genFType p) = " SPV(OpDPdx) ";" "\n"
"genFType dFdy(genFType p) = " SPV(OpDPdy) ";" "\n"

6
tools/qfcc/source/glsl-parse.y
View file

@ -1326,7 +1326,11 @@ jump_statement
}
| RETURN ';' { $$ = new_return_expr (nullptr); }
| RETURN expression ';' { $$ = new_return_expr ($2); }
| DISCARD ';' { $$ = nullptr; } //XXX
| DISCARD ';'
{
auto func = new_name_expr ("__discard");
$$ = new_call_expr (func, nullptr, nullptr);
}
;
%%

3
tools/qfcc/source/target_spirv.c
View file

@ -129,7 +129,8 @@ is_block_terminated (defspace_t *code_space)
|| (INSN(last_insn, 0) & SpvOpCodeMask) == SpvOpReturnValue
|| (INSN(last_insn, 0) & SpvOpCodeMask) == SpvOpUnreachable
|| (INSN(last_insn, 0) & SpvOpCodeMask) == SpvOpBranchConditional
|| (INSN(last_insn, 0) & SpvOpCodeMask) == SpvOpBranch)) {
|| (INSN(last_insn, 0) & SpvOpCodeMask) == SpvOpBranch
|| (INSN(last_insn, 0) & SpvOpCodeMask) == SpvOpKill)) {
return true;
}
return false;