libobs: Fix default negative int/float shader vals

If negative was specified it would not parse the negative sign and thus
would not interpret that number as negative, and would cause
shader/effect parsing to simply fail on the file.

libobs/graphics/effect-parser.c

@@ -718,19 +718,29 @@ static inline int ep_parse_param_assign_intfloat(struct effect_parser *ep,
 		struct ep_param *param, bool is_float)
 {
 	int code;
+	bool is_negative = false;
 
 	if (!cf_next_valid_token(&ep->cfp))
 		return PARSE_EOF;
 
+	if (cf_token_is(&ep->cfp, "-")) {
+		is_negative = true;
+
+		if (!cf_next_token(&ep->cfp))
+			return PARSE_EOF;
+	}
+
 	code = cf_token_is_type(&ep->cfp, CFTOKEN_NUM, "numeric value", ";");
 	if (code != PARSE_SUCCESS)
 		return code;
 
 	if (is_float) {
 		float f = (float)strtod(ep->cfp.cur_token->str.array, NULL);
+		if (is_negative) f = -f;
 		da_push_back_array(param->default_val, &f, sizeof(float));
 	} else {
 		long l = strtol(ep->cfp.cur_token->str.array, NULL, 10);
+		if (is_negative) l = -l;
 		da_push_back_array(param->default_val, &l, sizeof(long));
 	}
 

libobs/graphics/shader-parser.c

@@ -472,19 +472,29 @@ static inline int sp_parse_param_assign_intfloat(struct shader_parser *sp,
 		struct shader_var *param, bool is_float)
 {
 	int code;
+	bool is_negative = false;
 
 	if (!cf_next_valid_token(&sp->cfp))
 		return PARSE_EOF;
 
+	if (cf_token_is(&sp->cfp, "-")) {
+		is_negative = true;
+
+		if (!cf_next_token(&sp->cfp))
+			return PARSE_EOF;
+	}
+
 	code = cf_token_is_type(&sp->cfp, CFTOKEN_NUM, "numeric value", ";");
 	if (code != PARSE_SUCCESS)
 		return code;
 
 	if (is_float) {
 		float f = (float)strtod(sp->cfp.cur_token->str.array, NULL);
+		if (is_negative) f = -f;
 		da_push_back_array(param->default_val, &f, sizeof(float));
 	} else {
 		long l = strtol(sp->cfp.cur_token->str.array, NULL, 10);
+		if (is_negative) l = -l;
 		da_push_back_array(param->default_val, &l, sizeof(long));
 	}