diff options
| -rw-r--r-- | src/mesa/shader/slang/slang_preprocess.c | 65 |
1 files changed, 63 insertions, 2 deletions
diff --git a/src/mesa/shader/slang/slang_preprocess.c b/src/mesa/shader/slang/slang_preprocess.c index 15cd1ece7da..749bb8c0f64 100644 --- a/src/mesa/shader/slang/slang_preprocess.c +++ b/src/mesa/shader/slang/slang_preprocess.c @@ -1300,6 +1300,44 @@ error: } +/* + * Remove the continuation characters from the input string. + * This is the very first step in preprocessing and is effective + * even inside comment blocks. + * If there is a whitespace between a backslash and a newline, + * this is not considered as a line continuation. + */ +GLboolean +_slang_preprocess_backslashes(slang_string *output, + const char *input) +{ + while (*input) { + if (input[0] == '\\') { + /* If a newline follows, eat the backslash and the newline. */ + if (input[1] == '\r') { + if (input[2] == '\n') { + input += 3; + } else { + input += 2; + } + } else if (input[1] == '\n') { + if (input[2] == '\r') { + input += 3; + } else { + input += 2; + } + } else { + /* Leave the backslash alone. */ + slang_string_pushc(output, *input++); + } + } else { + slang_string_pushc(output, *input++); + } + } + return TRUE; +} + + /** * Run preprocessor on source code. * \param extensions indicates which GL extensions are enabled @@ -1319,6 +1357,7 @@ _slang_preprocess_directives(slang_string *output, { grammar pid, eid; GLboolean success; + slang_string without_backslashes; pid = grammar_load_from_text ((const byte *) (slang_pp_directives_syn)); if (pid == 0) { @@ -1331,14 +1370,36 @@ _slang_preprocess_directives(slang_string *output, grammar_destroy (pid); return GL_FALSE; } - success = preprocess_source (output, input, pid, eid, elog, extensions, pragmas); + + slang_string_init(&without_backslashes); + success = _slang_preprocess_backslashes(&without_backslashes, input); + + if (0) { + _mesa_printf("Pre-processed shader:\n"); + _mesa_printf("%s", slang_string_cstr(&without_backslashes)); + _mesa_printf("----------------------\n"); + } + + if (success) { + success = preprocess_source(output, + slang_string_cstr(&without_backslashes), + pid, + eid, + elog, + extensions, + pragmas); + } + + slang_string_free(&without_backslashes); grammar_destroy (eid); grammar_destroy (pid); + if (0) { _mesa_printf("Post-processed shader:\n"); - _mesa_printf("%s", output->data); + _mesa_printf("%s", slang_string_cstr(output)); _mesa_printf("----------------------\n"); } + return success; } |