diff options
Diffstat (limited to 'servers/visual/shader_language.cpp')
| -rw-r--r-- | servers/visual/shader_language.cpp | 101 |
1 files changed, 95 insertions, 6 deletions
diff --git a/servers/visual/shader_language.cpp b/servers/visual/shader_language.cpp index 6efd05593e..42b9f19d9d 100644 --- a/servers/visual/shader_language.cpp +++ b/servers/visual/shader_language.cpp @@ -132,6 +132,7 @@ const char *ShaderLanguage::token_names[TK_MAX] = { "TYPE_SAMPLERCUBE", "INTERPOLATION_FLAT", "INTERPOLATION_SMOOTH", + "CONST", "PRECISION_LOW", "PRECISION_MID", "PRECISION_HIGH", @@ -271,6 +272,7 @@ const ShaderLanguage::KeyWord ShaderLanguage::keyword_list[] = { { TK_TYPE_SAMPLERCUBE, "samplerCube" }, { TK_INTERPOLATION_FLAT, "flat" }, { TK_INTERPOLATION_SMOOTH, "smooth" }, + { TK_CONST, "const" }, { TK_PRECISION_LOW, "lowp" }, { TK_PRECISION_MID, "mediump" }, { TK_PRECISION_HIGH, "highp" }, @@ -920,6 +922,16 @@ bool ShaderLanguage::_find_identifier(const BlockNode *p_block, const Map<String return true; } + if (shader->constants.has(p_identifier)) { + if (r_data_type) { + *r_data_type = shader->constants[p_identifier].type; + } + if (r_type) { + *r_type = IDENTIFIER_CONSTANT; + } + return true; + } + for (int i = 0; i < shader->functions.size(); i++) { if (!shader->functions[i].callable) @@ -2699,6 +2711,12 @@ bool ShaderLanguage::_validate_assign(Node *p_node, const Map<StringName, BuiltI return false; } + if (shader->constants.has(var->name)) { + if (r_message) + *r_message = RTR("Constants cannot be modified."); + return false; + } + if (!(p_builtin_types.has(var->name) && p_builtin_types[var->name].constant)) { return true; } @@ -3993,7 +4011,7 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const Map<StringName, Bui } else { - //nothng else, so expression + //nothing else, so expression _set_tkpos(pos); //rollback Node *expr = _parse_and_reduce_expression(p_block, p_builtin_types); if (!expr) @@ -4322,24 +4340,30 @@ Error ShaderLanguage::_parse_shader(const Map<StringName, FunctionInfo> &p_funct } break; default: { - //function + //function or constant variable + bool is_constant = false; DataPrecision precision = PRECISION_DEFAULT; DataType type; StringName name; + if (tk.type == TK_CONST) { + is_constant = true; + tk = _get_token(); + } + if (is_token_precision(tk.type)) { precision = get_token_precision(tk.type); tk = _get_token(); } if (!is_token_datatype(tk.type)) { - _set_error("Expected function, uniform or varying "); + _set_error("Expected constant, function, uniform or varying "); return ERR_PARSE_ERROR; } if (!is_token_variable_datatype(tk.type)) { - _set_error("Invalid data type for function return (samplers not allowed)"); + _set_error("Invalid data type for constants or function return (samplers not allowed)"); return ERR_PARSE_ERROR; } @@ -4359,8 +4383,73 @@ Error ShaderLanguage::_parse_shader(const Map<StringName, FunctionInfo> &p_funct tk = _get_token(); if (tk.type != TK_PARENTHESIS_OPEN) { - _set_error("Expected '(' after identifier"); - return ERR_PARSE_ERROR; + if (type == TYPE_VOID) { + _set_error("Expected '(' after function identifier"); + return ERR_PARSE_ERROR; + } + + //variable + + while (true) { + ShaderNode::Constant constant; + constant.type = type; + constant.precision = precision; + constant.initializer = NULL; + + if (tk.type == TK_OP_ASSIGN) { + + if (!is_constant) { + _set_error("Expected 'const' keyword before constant definition"); + return ERR_PARSE_ERROR; + } + + //variable created with assignment! must parse an expression + Node *expr = _parse_and_reduce_expression(NULL, Map<StringName, BuiltInInfo>()); + if (!expr) + return ERR_PARSE_ERROR; + + if (expr->type != Node::TYPE_CONSTANT) { + _set_error("Expected constant expression after '='"); + return ERR_PARSE_ERROR; + } + + constant.initializer = static_cast<ConstantNode *>(expr); + + if (type != expr->get_datatype()) { + _set_error("Invalid assignment of '" + get_datatype_name(expr->get_datatype()) + "' to '" + get_datatype_name(type) + "'"); + return ERR_PARSE_ERROR; + } + tk = _get_token(); + } else { + _set_error("Expected initialization of constant"); + return ERR_PARSE_ERROR; + } + + shader->constants[name] = constant; + if (tk.type == TK_COMMA) { + tk = _get_token(); + if (tk.type != TK_IDENTIFIER) { + _set_error("Expected identifier after type"); + return ERR_PARSE_ERROR; + } + + name = tk.text; + if (_find_identifier(NULL, Map<StringName, BuiltInInfo>(), name)) { + _set_error("Redefinition of '" + String(name) + "'"); + return ERR_PARSE_ERROR; + } + + tk = _get_token(); + + } else if (tk.type == TK_SEMICOLON) { + break; + } else { + _set_error("Expected ',' or ';' after constant"); + return ERR_PARSE_ERROR; + } + } + + break; } Map<StringName, BuiltInInfo> builtin_types; |