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Fix shader preprocessor macro expansion

This commit is contained in:
bitsawer 2022-08-05 17:30:08 +03:00
parent cc35a8723c
commit 691e067ef5
2 changed files with 32 additions and 33 deletions
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60
servers/rendering/shader_preprocessor.cpp
View File

@ -703,46 +703,44 @@ void ShaderPreprocessor::expand_output_macros(int p_start, int p_line_number) {
}
Error ShaderPreprocessor::expand_macros(const String &p_string, int p_line, String &r_expanded) {
Vector<Pair<String, Define *>> active_defines;
active_defines.resize(state->defines.size());
int index = 0;
String iterative = p_string;
int pass_count = 0;
bool expanded = true;
while (expanded) {
expanded = false;
// As long as we find something to expand, keep going.
for (const RBMap<String, Define *>::Element *E = state->defines.front(); E; E = E->next()) {
active_defines.set(index++, Pair<String, Define *>(E->key(), E->get()));
if (expand_macros_once(iterative, p_line, E, iterative)) {
expanded = true;
}
}
return expand_macros(p_string, p_line, active_defines, r_expanded);
pass_count++;
if (pass_count > 50) {
set_error(RTR("Macro expansion limit exceeded."), p_line);
break;
}
}
Error ShaderPreprocessor::expand_macros(const String &p_string, int p_line, Vector<Pair<String, Define *>> p_defines, String &r_expanded) {
r_expanded = p_string;
// When expanding macros we must only evaluate them once.
// Later we continue expanding but with the already
// evaluated macros removed.
for (int i = 0; i < p_defines.size(); i++) {
Pair<String, Define *> define_pair = p_defines[i];
r_expanded = iterative;
Error error = expand_macros_once(r_expanded, p_line, define_pair, r_expanded);
if (error != OK) {
return error;
if (!state->error.is_empty()) {
return FAILED;
}
// Remove expanded macro and recursively replace remaining.
p_defines.remove_at(i);
return expand_macros(r_expanded, p_line, p_defines, r_expanded);
}
return OK;
}
Error ShaderPreprocessor::expand_macros_once(const String &p_line, int p_line_number, Pair<String, Define *> p_define_pair, String &r_expanded) {
bool ShaderPreprocessor::expand_macros_once(const String &p_line, int p_line_number, const RBMap<String, Define *>::Element *p_define_pair, String &r_expanded) {
String result = p_line;
const String &key = p_define_pair.first;
const Define *define = p_define_pair.second;
const String &key = p_define_pair->key();
const Define *define = p_define_pair->value();
int index_start = 0;
int index = 0;
while (find_match(result, key, index, index_start)) {
if (find_match(result, key, index, index_start)) {
String body = define->body;
if (define->arguments.size() > 0) {
// Complex macro with arguments.
@ -750,14 +748,14 @@ Error ShaderPreprocessor::expand_macros_once(const String &p_line, int p_line_nu
int args_end = p_line.find(")", args_start);
if (args_start == -1 || args_end == -1) {
set_error(RTR("Missing macro argument parenthesis."), p_line_number);
return FAILED;
return false;
}
String values = result.substr(args_start + 1, args_end - (args_start + 1));
Vector<String> args = values.split(",");
if (args.size() != define->arguments.size()) {
set_error(RTR("Invalid macro argument count."), p_line_number);
return FAILED;
return false;
}
// Insert macro arguments into the body.
@ -779,11 +777,13 @@ Error ShaderPreprocessor::expand_macros_once(const String &p_line, int p_line_nu
// Manually reset index_start to where the body value of the define finishes.
// This ensures we don't skip another instance of this macro in the string.
index_start = index + body.length() + 1;
break;
}
}
r_expanded = result;
return OK;
return true;
}
return false;
}
bool ShaderPreprocessor::find_match(const String &p_string, const String &p_value, int &r_index, int &r_index_start) {

3
servers/rendering/shader_preprocessor.h
View File

@ -171,8 +171,7 @@ private:
void expand_output_macros(int p_start, int p_line);
Error expand_macros(const String &p_string, int p_line, String &r_result);
Error expand_macros(const String &p_string, int p_line, Vector<Pair<String, Define *>> p_defines, String &r_result);
Error expand_macros_once(const String &p_line, int p_line_number, Pair<String, Define *> p_define_pair, String &r_expanded);
bool expand_macros_once(const String &p_line, int p_line_number, const RBMap<String, Define *>::Element *p_define_pair, String &r_expanded);
bool find_match(const String &p_string, const String &p_value, int &r_index, int &r_index_start);
String next_directive(Tokenizer *p_tokenizer, const Vector<String> &p_directives);