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Added constant support to shaders

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Co-authored-by: DavidSichma <sichmada@gmail.com>
This commit is contained in:
Chaosus 2019-05-30 17:19:24 +03:00
parent 7310c84367
commit c2d4abf62e
4 changed files with 133 additions and 6 deletions
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15
drivers/gles2/shader_compiler_gles2.cpp
View file

@ -361,6 +361,21 @@ String ShaderCompilerGLES2::_dump_node_code(SL::Node *p_node, int p_level, Gener
fragment_global += final_code;
}
// constants
for (Map<StringName, SL::ShaderNode::Constant>::Element *E = snode->constants.front(); E; E = E->next()) {
String gcode;
gcode += "const ";
gcode += _prestr(E->get().precision);
gcode += _typestr(E->get().type);
gcode += " " + _mkid(E->key());
gcode += "=";
gcode += _dump_node_code(E->get().initializer, p_level, r_gen_code, p_actions, p_default_actions, p_assigning);
gcode += ";\n";
vertex_global += gcode;
fragment_global += gcode;
}
// functions
Map<StringName, String> function_code;

13
drivers/gles3/shader_compiler_gles3.cpp
View file

@ -472,6 +472,19 @@ String ShaderCompilerGLES3::_dump_node_code(SL::Node *p_node, int p_level, Gener
r_gen_code.fragment_global += interp_mode + "in " + vcode;
}
for (Map<StringName, SL::ShaderNode::Constant>::Element *E = pnode->constants.front(); E; E = E->next()) {
String gcode;
gcode += "const ";
gcode += _prestr(E->get().precision);
gcode += _typestr(E->get().type);
gcode += " " + _mkid(E->key());
gcode += "=";
gcode += _dump_node_code(E->get().initializer, p_level, r_gen_code, p_actions, p_default_actions, p_assigning);
gcode += ";\n";
r_gen_code.vertex_global += gcode;
r_gen_code.fragment_global += gcode;
}
Map<StringName, String> function_code;
//code for functions

101
servers/visual/shader_language.cpp
View file

@ -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;

10
servers/visual/shader_language.h
View file

@ -80,6 +80,7 @@ public:
TK_TYPE_SAMPLERCUBE,
TK_INTERPOLATION_FLAT,
TK_INTERPOLATION_SMOOTH,
TK_CONST,
TK_PRECISION_LOW,
TK_PRECISION_MID,
TK_PRECISION_HIGH,
@ -440,6 +441,13 @@ public:
};
struct ShaderNode : public Node {
struct Constant {
DataType type;
DataPrecision precision;
ConstantNode *initializer;
};
struct Function {
StringName name;
FunctionNode *function;
@ -492,6 +500,7 @@ public:
}
};
Map<StringName, Constant> constants;
Map<StringName, Varying> varyings;
Map<StringName, Uniform> uniforms;
Vector<StringName> render_modes;
@ -632,6 +641,7 @@ private:
IDENTIFIER_FUNCTION_ARGUMENT,
IDENTIFIER_LOCAL_VAR,
IDENTIFIER_BUILTIN_VAR,
IDENTIFIER_CONSTANT,
};
bool _find_identifier(const BlockNode *p_block, const Map<StringName, BuiltInInfo> &p_builtin_types, const StringName &p_identifier, DataType *r_data_type = NULL, IdentifierType *r_type = NULL);