/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "glsl_symbol_table.h"
#include "ast.h"
#include "glsl_types.h"
#include "ir.h"
inline unsigned min(unsigned a, unsigned b)
{
return (a < b) ? a : b;
}
static ir_rvalue *
convert_component(ir_rvalue *src, const glsl_type *desired_type);
static unsigned
process_parameters(exec_list *instructions, exec_list *actual_parameters,
exec_list *parameters,
struct _mesa_glsl_parse_state *state)
{
unsigned count = 0;
foreach_list (n, parameters) {
ast_node *const ast = exec_node_data(ast_node, n, link);
ir_rvalue *result = ast->hir(instructions, state);
ir_constant *const constant = result->constant_expression_value();
if (constant != NULL)
result = constant;
actual_parameters->push_tail(result);
count++;
}
return count;
}
/**
* Generate a source prototype for a function signature
*
* \param return_type Return type of the function. May be \c NULL.
* \param name Name of the function.
* \param parameters Parameter list for the function. This may be either a
* formal or actual parameter list. Only the type is used.
*
* \return
* A talloced string representing the prototype of the function.
*/
char *
prototype_string(const glsl_type *return_type, const char *name,
exec_list *parameters)
{
char *str = NULL;
if (return_type != NULL)
str = talloc_asprintf(str, "%s ", return_type->name);
str = talloc_asprintf_append(str, "%s(", name);
const char *comma = "";
foreach_list(node, parameters) {
const ir_instruction *const param = (ir_instruction *) node;
str = talloc_asprintf_append(str, "%s%s", comma, param->type->name);
comma = ", ";
}
str = talloc_strdup_append(str, ")");
return str;
}
static ir_rvalue *
process_call(exec_list *instructions, ir_function *f,
YYLTYPE *loc, exec_list *actual_parameters,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
ir_function_signature *sig = f->matching_signature(actual_parameters);
/* The instructions param will be used when the FINISHMEs below are done */
(void) instructions;
if (sig != NULL) {
/* Verify that 'out' and 'inout' actual parameters are lvalues. This
* isn't done in ir_function::matching_signature because that function
* cannot generate the necessary diagnostics.
*/
exec_list_iterator actual_iter = actual_parameters->iterator();
exec_list_iterator formal_iter = sig->parameters.iterator();
while (actual_iter.has_next()) {
ir_rvalue *actual = (ir_rvalue *) actual_iter.get();
ir_variable *formal = (ir_variable *) formal_iter.get();
assert(actual != NULL);
assert(formal != NULL);
if ((formal->mode == ir_var_out)
|| (formal->mode == ir_var_inout)) {
if (! actual->is_lvalue()) {
/* FINISHME: Log a better diagnostic here. There is no way
* FINISHME: to tell the user which parameter is invalid.
*/
_mesa_glsl_error(loc, state, "`%s' parameter is not lvalue",
(formal->mode == ir_var_out) ? "out" : "inout");
}
}
if (formal->type->is_numeric() || formal->type->is_boolean()) {
ir_rvalue *converted = convert_component(actual, formal->type);
actual->replace_with(converted);
}
actual_iter.next();
formal_iter.next();
}
/* Always insert the call in the instruction stream, and return a deref
* of its return val if it returns a value, since we don't know if
* the rvalue is going to be assigned to anything or not.
*/
ir_call *call = new(ctx) ir_call(sig, actual_parameters);
if (!sig->return_type->is_void()) {
ir_variable *var;
ir_dereference_variable *deref;
var = new(ctx) ir_variable(sig->return_type,
talloc_asprintf(ctx, "%s_retval",
sig->function_name()),
ir_var_temporary);
instructions->push_tail(var);
deref = new(ctx) ir_dereference_variable(var);
ir_assignment *assign = new(ctx) ir_assignment(deref, call, NULL);
instructions->push_tail(assign);
if (state->language_version >= 120)
var->constant_value = call->constant_expression_value();
deref = new(ctx) ir_dereference_variable(var);
return deref;
} else {
instructions->push_tail(call);
return NULL;
}
} else {
char *str = prototype_string(NULL, f->name, actual_parameters);
_mesa_glsl_error(loc, state, "no matching function for call to `%s'",
str);
talloc_free(str);
const char *prefix = "candidates are: ";
foreach_list (node, &f->signatures) {
ir_function_signature *sig = (ir_function_signature *) node;
str = prototype_string(sig->return_type, f->name, &sig->parameters);
_mesa_glsl_error(loc, state, "%s%s\n", prefix, str);
talloc_free(str);
prefix = " ";
}
return ir_call::get_error_instruction(ctx);
}
}
static ir_rvalue *
match_function_by_name(exec_list *instructions, const char *name,
YYLTYPE *loc, exec_list *actual_parameters,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
ir_function *f = state->symbols->get_function(name);
if (f == NULL) {
_mesa_glsl_error(loc, state, "function `%s' undeclared", name);
return ir_call::get_error_instruction(ctx);
}
/* Once we've determined that the function being called might exist, try
* to find an overload of the function that matches the parameters.
*/
return process_call(instructions, f, loc, actual_parameters, state);
}
/**
* Perform automatic type conversion of constructor parameters
*
* This implements the rules in the "Conversion and Scalar Constructors"
* section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
*/
static ir_rvalue *
convert_component(ir_rvalue *src, const glsl_type *desired_type)
{
void *ctx = talloc_parent(src);
const unsigned a = desired_type->base_type;
const unsigned b = src->type->base_type;
ir_expression *result = NULL;
if (src->type->is_error())
return src;
assert(a <= GLSL_TYPE_BOOL);
assert(b <= GLSL_TYPE_BOOL);
if ((a == b) || (src->type->is_integer() && desired_type->is_integer()))
return src;
switch (a) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
if (b == GLSL_TYPE_FLOAT)
result = new(ctx) ir_expression(ir_unop_f2i, desired_type, src, NULL);
else {
assert(b == GLSL_TYPE_BOOL);
result = new(ctx) ir_expression(ir_unop_b2i, desired_type, src, NULL);
}
break;
case GLSL_TYPE_FLOAT:
switch (b) {
case GLSL_TYPE_UINT:
result = new(ctx) ir_expression(ir_unop_u2f, desired_type, src, NULL);
break;
case GLSL_TYPE_INT:
result = new(ctx) ir_expression(ir_unop_i2f, desired_type, src, NULL);
break;
case GLSL_TYPE_BOOL:
result = new(ctx) ir_expression(ir_unop_b2f, desired_type, src, NULL);
break;
}
break;
case GLSL_TYPE_BOOL:
switch (b) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
result = new(ctx) ir_expression(ir_unop_i2b, desired_type, src, NULL);
break;
case GLSL_TYPE_FLOAT:
result = new(ctx) ir_expression(ir_unop_f2b, desired_type, src, NULL);
break;
}
break;
}
assert(result != NULL);
/* Try constant folding; it may fold in the conversion we just added. */
ir_constant *const constant = result->constant_expression_value();
return (constant != NULL) ? (ir_rvalue *) constant : (ir_rvalue *) result;
}
/**
* Dereference a specific component from a scalar, vector, or matrix
*/
static ir_rvalue *
dereference_component(ir_rvalue *src, unsigned component)
{
void *ctx = talloc_parent(src);
assert(component < src->type->components());
/* If the source is a constant, just create a new constant instead of a
* dereference of the existing constant.
*/
ir_constant *constant = src->as_constant();
if (constant)
return new(ctx) ir_constant(constant, component);
if (src->type->is_scalar()) {
return src;
} else if (src->type->is_vector()) {
return new(ctx) ir_swizzle(src, component, 0, 0, 0, 1);
} else {
assert(src->type->is_matrix());
/* Dereference a row of the matrix, then call this function again to get
* a specific element from that row.
*/
const int c = component / src->type->column_type()->vector_elements;
const int r = component % src->type->column_type()->vector_elements;
ir_constant *const col_index = new(ctx) ir_constant(c);
ir_dereference *const col = new(ctx) ir_dereference_array(src, col_index);
col->type = src->type->column_type();
return dereference_component(col, r);
}
assert(!"Should not get here.");
return NULL;
}
static ir_rvalue *
process_array_constructor(exec_list *instructions,
const glsl_type *constructor_type,
YYLTYPE *loc, exec_list *parameters,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
/* Array constructors come in two forms: sized and unsized. Sized array
* constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
* variables. In this case the number of parameters must exactly match the
* specified size of the array.
*
* Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
* are vec4 variables. In this case the size of the array being constructed
* is determined by the number of parameters.
*
* From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
*
* "There must be exactly the same number of arguments as the size of
* the array being constructed. If no size is present in the
* constructor, then the array is explicitly sized to the number of
* arguments provided. The arguments are assigned in order, starting at
* element 0, to the elements of the constructed array. Each argument
* must be the same type as the element type of the array, or be a type
* that can be converted to the element type of the array according to
* Section 4.1.10 "Implicit Conversions.""
*/
exec_list actual_parameters;
const unsigned parameter_count =
process_parameters(instructions, &actual_parameters, parameters, state);
if ((parameter_count == 0)
|| ((constructor_type->length != 0)
&& (constructor_type->length != parameter_count))) {
const unsigned min_param = (constructor_type->length == 0)
? 1 : constructor_type->length;
_mesa_glsl_error(loc, state, "array constructor must have %s %u "
"parameter%s",
(constructor_type->length != 0) ? "at least" : "exactly",
min_param, (min_param <= 1) ? "" : "s");
return ir_call::get_error_instruction(ctx);
}
if (constructor_type->length == 0) {
constructor_type =
glsl_type::get_array_instance(constructor_type->element_type(),
parameter_count);
assert(constructor_type != NULL);
assert(constructor_type->length == parameter_count);
}
bool all_parameters_are_constant = true;
/* Type cast each parameter and, if possible, fold constants. */
foreach_list_safe(n, &actual_parameters) {
ir_rvalue *ir = (ir_rvalue *) n;
ir_rvalue *result = ir;
/* Apply implicit conversions (not the scalar constructor rules!) */
if (constructor_type->element_type()->is_float()) {
const glsl_type *desired_type =
glsl_type::get_instance(GLSL_TYPE_FLOAT,
ir->type->vector_elements,
ir->type->matrix_columns);
result = convert_component(ir, desired_type);
}
if (result->type != constructor_type->element_type()) {
_mesa_glsl_error(loc, state, "type error in array constructor: "
"expected: %s, found %s",
constructor_type->element_type()->name,
result->type->name);
}
/* Attempt to convert the parameter to a constant valued expression.
* After doing so, track whether or not all the parameters to the
* constructor are trivially constant valued expressions.
*/
ir_rvalue *const constant = result->constant_expression_value();
if (constant != NULL)
result = constant;
else
all_parameters_are_constant = false;
ir->replace_with(result);
}
if (all_parameters_are_constant)
return new(ctx) ir_constant(constructor_type, &actual_parameters);
ir_variable *var = new(ctx) ir_variable(constructor_type, "array_ctor",
ir_var_temporary);
instructions->push_tail(var);
int i = 0;
foreach_list(node, &actual_parameters) {
ir_rvalue *rhs = (ir_rvalue *) node;
ir_rvalue *lhs = new(ctx) ir_dereference_array(var,
new(ctx) ir_constant(i));
ir_instruction *assignment = new(ctx) ir_assignment(lhs, rhs, NULL);
instructions->push_tail(assignment);
i++;
}
return new(ctx) ir_dereference_variable(var);
}
/**
* Try to convert a record constructor to a constant expression
*/
static ir_constant *
constant_record_constructor(const glsl_type *constructor_type,
YYLTYPE *loc, exec_list *parameters,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
bool all_parameters_are_constant = true;
exec_node *node = parameters->head;
for (unsigned i = 0; i < constructor_type->length; i++) {
ir_instruction *ir = (ir_instruction *) node;
if (node->is_tail_sentinel()) {
_mesa_glsl_error(loc, state,
"insufficient parameters to constructor for `%s'",
constructor_type->name);
return NULL;
}
if (ir->type != constructor_type->fields.structure[i].type) {
_mesa_glsl_error(loc, state,
"parameter type mismatch in constructor for `%s' "
" (%s vs %s)",
constructor_type->name,
ir->type->name,
constructor_type->fields.structure[i].type->name);
return NULL;
}
if (ir->as_constant() == NULL)
all_parameters_are_constant = false;
node = node->next;
}
if (!all_parameters_are_constant)
return NULL;
return new(ctx) ir_constant(constructor_type, parameters);
}
/**
* Generate data for a constant matrix constructor w/a single scalar parameter
*
* Matrix constructors in GLSL can be passed a single scalar of the
* approriate type. In these cases, the resulting matrix is the identity
* matrix multipled by the specified scalar. This function generates data for
* that matrix.
*
* \param type Type of the desired matrix.
* \param initializer Scalar value used to initialize the matrix diagonal.
* \param data Location to store the resulting matrix.
*/
void
generate_constructor_matrix(const glsl_type *type, ir_constant *initializer,
ir_constant_data *data)
{
switch (type->base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
for (unsigned i = 0; i < type->components(); i++)
data->u[i] = 0;
for (unsigned i = 0; i < type->matrix_columns; i++) {
/* The array offset of the ith row and column of the matrix.
*/
const unsigned idx = (i * type->vector_elements) + i;
data->u[idx] = initializer->value.u[0];
}
break;
case GLSL_TYPE_FLOAT:
for (unsigned i = 0; i < type->components(); i++)
data->f[i] = 0;
for (unsigned i = 0; i < type->matrix_columns; i++) {
/* The array offset of the ith row and column of the matrix.
*/
const unsigned idx = (i * type->vector_elements) + i;
data->f[idx] = initializer->value.f[0];
}
break;
default:
assert(!"Should not get here.");
break;
}
}
/**
* Generate data for a constant vector constructor w/a single scalar parameter
*
* Vector constructors in GLSL can be passed a single scalar of the
* approriate type. In these cases, the resulting vector contains the specified
* value in all components. This function generates data for that vector.
*
* \param type Type of the desired vector.
* \param initializer Scalar value used to initialize the vector.
* \param data Location to store the resulting vector data.
*/
void
generate_constructor_vector(const glsl_type *type, ir_constant *initializer,
ir_constant_data *data)
{
switch (type->base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
for (unsigned i = 0; i < type->components(); i++)
data->u[i] = initializer->value.u[0];
break;
case GLSL_TYPE_FLOAT:
for (unsigned i = 0; i < type->components(); i++)
data->f[i] = initializer->value.f[0];
break;
case GLSL_TYPE_BOOL:
for (unsigned i = 0; i < type->components(); i++)
data->b[i] = initializer->value.b[0];
break;
default:
assert(!"Should not get here.");
break;
}
}
/**
* Determine if a list consists of a single scalar r-value
*/
bool
single_scalar_parameter(exec_list *parameters)
{
const ir_rvalue *const p = (ir_rvalue *) parameters->head;
assert(((ir_rvalue *)p)->as_rvalue() != NULL);
return (p->type->is_scalar() && p->next->is_tail_sentinel());
}
/**
* Generate inline code for a vector constructor
*
* The generated constructor code will consist of a temporary variable
* declaration of the same type as the constructor. A sequence of assignments
* from constructor parameters to the temporary will follow.
*
* \return
* An \c ir_dereference_variable of the temprorary generated in the constructor
* body.
*/
ir_rvalue *
emit_inline_vector_constructor(const glsl_type *type,
exec_list *instructions,
exec_list *parameters,
void *ctx)
{
assert(!parameters->is_empty());
ir_variable *var = new(ctx) ir_variable(type, "vec_ctor", ir_var_temporary);
instructions->push_tail(var);
/* There are two kinds of vector constructors.
*
* - Construct a vector from a single scalar by replicating that scalar to
* all components of the vector.
*
* - Construct a vector from an arbirary combination of vectors and
* scalars. The components of the constructor parameters are assigned
* to the vector in order until the vector is full.
*/
const unsigned lhs_components = type->components();
if (single_scalar_parameter(parameters)) {
ir_rvalue *first_param = (ir_rvalue *)parameters->head;
ir_rvalue *rhs = new(ctx) ir_swizzle(first_param, 0, 0, 0, 0,
lhs_components);
ir_dereference_variable *lhs = new(ctx) ir_dereference_variable(var);
const unsigned mask = (1U << lhs_components) - 1;
assert(rhs->type == lhs->type);
ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL, mask);
instructions->push_tail(inst);
} else {
unsigned base_component = 0;
foreach_list(node, parameters) {
ir_rvalue *param = (ir_rvalue *) node;
unsigned rhs_components = param->type->components();
/* Do not try to assign more components to the vector than it has!
*/
if ((rhs_components + base_component) > lhs_components) {
rhs_components = lhs_components - base_component;
}
/* Generate a swizzle that puts the first element of the source at
* the location of the first element of the destination.
*/
unsigned swiz[4] = { 0, 0, 0, 0 };
for (unsigned i = 0; i < rhs_components; i++)
swiz[i + base_component] = i;
/* Mask of fields to be written in the assignment.
*/
const unsigned write_mask = ((1U << rhs_components) - 1)
<< base_component;
ir_dereference *lhs = new(ctx) ir_dereference_variable(var);
ir_rvalue *rhs = new(ctx) ir_swizzle(param, swiz, lhs_components);
ir_instruction *inst =
new(ctx) ir_assignment(lhs, rhs, NULL, write_mask);
instructions->push_tail(inst);
/* Advance the component index by the number of components that were
* just assigned.
*/
base_component += rhs_components;
}
}
return new(ctx) ir_dereference_variable(var);
}
/**
* Generate assignment of a portion of a vector to a portion of a matrix column
*
* \param src_base First component of the source to be used in assignment
* \param column Column of destination to be assiged
* \param row_base First component of the destination column to be assigned
* \param count Number of components to be assigned
*
* \note
* \c src_base + \c count must be less than or equal to the number of components
* in the source vector.
*/
ir_instruction *
assign_to_matrix_column(ir_variable *var, unsigned column, unsigned row_base,
ir_rvalue *src, unsigned src_base, unsigned count,
void *mem_ctx)
{
ir_constant *col_idx = new(mem_ctx) ir_constant(column);
ir_dereference *column_ref = new(mem_ctx) ir_dereference_array(var, col_idx);
assert(column_ref->type->components() >= (row_base + count));
assert(src->type->components() >= (src_base + count));
/* Generate a swizzle that puts the first element of the source at the
* location of the first element of the destination.
*/
unsigned swiz[4] = { src_base, src_base, src_base, src_base };
for (unsigned i = 0; i < count; i++)
swiz[i + row_base] = src_base + i;
ir_rvalue *const rhs =
new(mem_ctx) ir_swizzle(src, swiz, column_ref->type->components());
/* Mask of fields to be written in the assignment.
*/
const unsigned write_mask = ((1U << count) - 1) << row_base;
return new(mem_ctx) ir_assignment(column_ref, rhs, NULL, write_mask);
}
/**
* Generate inline code for a matrix constructor
*
* The generated constructor code will consist of a temporary variable
* declaration of the same type as the constructor. A sequence of assignments
* from constructor parameters to the temporary will follow.
*
* \return
* An \c ir_dereference_variable of the temprorary generated in the constructor
* body.
*/
ir_rvalue *
emit_inline_matrix_constructor(const glsl_type *type,
exec_list *instructions,
exec_list *parameters,
void *ctx)
{
assert(!parameters->is_empty());
ir_variable *var = new(ctx) ir_variable(type, "mat_ctor", ir_var_temporary);
instructions->push_tail(var);
/* There are three kinds of matrix constructors.
*
* - Construct a matrix from a single scalar by replicating that scalar to
* along the diagonal of the matrix and setting all other components to
* zero.
*
* - Construct a matrix from an arbirary combination of vectors and
* scalars. The components of the constructor parameters are assigned
* to the matrix in colum-major order until the matrix is full.
*
* - Construct a matrix from a single matrix. The source matrix is copied
* to the upper left portion of the constructed matrix, and the remaining
* elements take values from the identity matrix.
*/
ir_rvalue *const first_param = (ir_rvalue *) parameters->head;
if (single_scalar_parameter(parameters)) {
/* Assign the scalar to the X component of a vec4, and fill the remaining
* components with zero.
*/
ir_variable *rhs_var =
new(ctx) ir_variable(glsl_type::vec4_type, "mat_ctor_vec",
ir_var_temporary);
instructions->push_tail(rhs_var);
ir_constant_data zero;
zero.f[0] = 0.0;
zero.f[1] = 0.0;
zero.f[2] = 0.0;
zero.f[3] = 0.0;
ir_instruction *inst =
new(ctx) ir_assignment(new(ctx) ir_dereference_variable(rhs_var),
new(ctx) ir_constant(rhs_var->type, &zero),
NULL);
instructions->push_tail(inst);
ir_dereference *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);
inst = new(ctx) ir_assignment(rhs_ref, first_param, NULL, 0x01);
instructions->push_tail(inst);
/* Assign the temporary vector to each column of the destination matrix
* with a swizzle that puts the X component on the diagonal of the
* matrix. In some cases this may mean that the X component does not
* get assigned into the column at all (i.e., when the matrix has more
* columns than rows).
*/
static const unsigned rhs_swiz[4][4] = {
{ 0, 1, 1, 1 },
{ 1, 0, 1, 1 },
{ 1, 1, 0, 1 },
{ 1, 1, 1, 0 }
};
const unsigned cols_to_init = min(type->matrix_columns,
type->vector_elements);
for (unsigned i = 0; i < cols_to_init; i++) {
ir_constant *const col_idx = new(ctx) ir_constant(i);
ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx);
ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);
ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, rhs_swiz[i],
type->vector_elements);
inst = new(ctx) ir_assignment(col_ref, rhs, NULL);
instructions->push_tail(inst);
}
for (unsigned i = cols_to_init; i < type->matrix_columns; i++) {
ir_constant *const col_idx = new(ctx) ir_constant(i);
ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx);
ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var);
ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, 1, 1, 1, 1,
type->vector_elements);
inst = new(ctx) ir_assignment(col_ref, rhs, NULL);
instructions->push_tail(inst);
}
} else if (first_param->type->is_matrix()) {
/* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
*
* "If a matrix is constructed from a matrix, then each component
* (column i, row j) in the result that has a corresponding
* component (column i, row j) in the argument will be initialized
* from there. All other components will be initialized to the
* identity matrix. If a matrix argument is given to a matrix
* constructor, it is an error to have any other arguments."
*/
assert(first_param->next->is_tail_sentinel());
ir_rvalue *const src_matrix = first_param;
/* If the source matrix is smaller, pre-initialize the relavent parts of
* the destination matrix to the identity matrix.
*/
if ((src_matrix->type->matrix_columns < var->type->matrix_columns)
|| (src_matrix->type->vector_elements < var->type->vector_elements)) {
/* If the source matrix has fewer rows, every column of the destination
* must be initialized. Otherwise only the columns in the destination
* that do not exist in the source must be initialized.
*/
unsigned col =
(src_matrix->type->vector_elements < var->type->vector_elements)
? 0 : src_matrix->type->matrix_columns;
const glsl_type *const col_type = var->type->column_type();
for (/* empty */; col < var->type->matrix_columns; col++) {
ir_constant_data ident;
ident.f[0] = 0.0;
ident.f[1] = 0.0;
ident.f[2] = 0.0;
ident.f[3] = 0.0;
ident.f[col] = 1.0;
ir_rvalue *const rhs = new(ctx) ir_constant(col_type, &ident);
ir_rvalue *const lhs =
new(ctx) ir_dereference_array(var, new(ctx) ir_constant(col));
ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL);
instructions->push_tail(inst);
}
}
/* Assign columns from the source matrix to the destination matrix.
*
* Since the parameter will be used in the RHS of multiple assignments,
* generate a temporary and copy the paramter there.
*/
ir_variable *const rhs_var =
new(ctx) ir_variable(first_param->type, "mat_ctor_mat",
ir_var_temporary);
instructions->push_tail(rhs_var);
ir_dereference *const rhs_var_ref =
new(ctx) ir_dereference_variable(rhs_var);
ir_instruction *const inst =
new(ctx) ir_assignment(rhs_var_ref, first_param, NULL);
instructions->push_tail(inst);
unsigned swiz[4] = { 0, 0, 0, 0 };
for (unsigned i = 1; i < src_matrix->type->vector_elements; i++)
swiz[i] = i;
const unsigned last_col = min(src_matrix->type->matrix_columns,
var->type->matrix_columns);
const unsigned write_mask = (1U << var->type->vector_elements) - 1;
for (unsigned i = 0; i < last_col; i++) {
ir_dereference *const lhs =
new(ctx) ir_dereference_array(var, new(ctx) ir_constant(i));
ir_rvalue *const rhs_col =
new(ctx) ir_dereference_array(rhs_var, new(ctx) ir_constant(i));
/* If one matrix has columns that are smaller than the columns of the
* other matrix, wrap the column access of the larger with a swizzle
* so that the LHS and RHS of the assignment have the same size (and
* therefore have the same type).
*
* It would be perfectly valid to unconditionally generate the
* swizzles, this this will typically result in a more compact IR tree.
*/
ir_rvalue *rhs;
if (lhs->type->vector_elements != rhs_col->type->vector_elements) {
rhs = new(ctx) ir_swizzle(rhs_col, swiz,
lhs->type->vector_elements);
} else {
rhs = rhs_col;
}
assert(lhs->type == rhs->type);
ir_instruction *inst =
new(ctx) ir_assignment(lhs, rhs, NULL, write_mask);
instructions->push_tail(inst);
}
} else {
const unsigned rows = type->matrix_columns;
const unsigned cols = type->vector_elements;
unsigned col_idx = 0;
unsigned row_idx = 0;
foreach_list (node, parameters) {
ir_rvalue *const rhs = (ir_rvalue *) node;
const unsigned components_remaining_this_column = rows - row_idx;
unsigned rhs_components = rhs->type->components();
unsigned rhs_base = 0;
/* Since the parameter might be used in the RHS of two assignments,
* generate a temporary and copy the paramter there.
*/
ir_variable *rhs_var =
new(ctx) ir_variable(rhs->type, "mat_ctor_vec", ir_var_temporary);
instructions->push_tail(rhs_var);
ir_dereference *rhs_var_ref =
new(ctx) ir_dereference_variable(rhs_var);
ir_instruction *inst = new(ctx) ir_assignment(rhs_var_ref, rhs, NULL);
instructions->push_tail(inst);
/* Assign the current parameter to as many components of the matrix
* as it will fill.
*
* NOTE: A single vector parameter can span two matrix columns. A
* single vec4, for example, can completely fill a mat2.
*/
if (rhs_components >= components_remaining_this_column) {
const unsigned count = min(rhs_components,
components_remaining_this_column);
rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var);
ir_instruction *inst = assign_to_matrix_column(var, col_idx,
row_idx,
rhs_var_ref, 0,
count, ctx);
instructions->push_tail(inst);
rhs_base = count;
col_idx++;
row_idx = 0;
}
/* If there is data left in the parameter and components left to be
* set in the destination, emit another assignment. It is possible
* that the assignment could be of a vec4 to the last element of the
* matrix. In this case col_idx==cols, but there is still data
* left in the source parameter. Obviously, don't emit an assignment
* to data outside the destination matrix.
*/
if ((col_idx < cols) && (rhs_base < rhs_components)) {
const unsigned count = rhs_components - rhs_base;
rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var);
ir_instruction *inst = assign_to_matrix_column(var, col_idx,
row_idx,
rhs_var_ref,
rhs_base,
count, ctx);
instructions->push_tail(inst);
row_idx += count;
}
}
}
return new(ctx) ir_dereference_variable(var);
}
ir_rvalue *
ast_function_expression::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
/* There are three sorts of function calls.
*
* 1. constructors - The first subexpression is an ast_type_specifier.
* 2. methods - Only the .length() method of array types.
* 3. functions - Calls to regular old functions.
*
* Method calls are actually detected when the ast_field_selection
* expression is handled.
*/
if (is_constructor()) {
const ast_type_specifier *type = (ast_type_specifier *) subexpressions[0];
YYLTYPE loc = type->get_location();
const char *name;
const glsl_type *const constructor_type = type->glsl_type(& name, state);
/* Constructors for samplers are illegal.
*/
if (constructor_type->is_sampler()) {
_mesa_glsl_error(& loc, state, "cannot construct sampler type `%s'",
constructor_type->name);
return ir_call::get_error_instruction(ctx);
}
if (constructor_type->is_array()) {
if (state->language_version <= 110) {
_mesa_glsl_error(& loc, state,
"array constructors forbidden in GLSL 1.10");
return ir_call::get_error_instruction(ctx);
}
return process_array_constructor(instructions, constructor_type,
& loc, &this->expressions, state);
}
/* There are two kinds of constructor call. Constructors for built-in
* language types, such as mat4 and vec2, are free form. The only
* requirement is that the parameters must provide enough values of the
* correct scalar type. Constructors for arrays and structures must
* have the exact number of parameters with matching types in the
* correct order. These constructors follow essentially the same type
* matching rules as functions.
*/
if (!constructor_type->is_numeric() && !constructor_type->is_boolean())
return ir_call::get_error_instruction(ctx);
/* Total number of components of the type being constructed. */
const unsigned type_components = constructor_type->components();
/* Number of components from parameters that have actually been
* consumed. This is used to perform several kinds of error checking.
*/
unsigned components_used = 0;
unsigned matrix_parameters = 0;
unsigned nonmatrix_parameters = 0;
exec_list actual_parameters;
foreach_list (n, &this->expressions) {
ast_node *ast = exec_node_data(ast_node, n, link);
ir_rvalue *result = ast->hir(instructions, state)->as_rvalue();
/* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
*
* "It is an error to provide extra arguments beyond this
* last used argument."
*/
if (components_used >= type_components) {
_mesa_glsl_error(& loc, state, "too many parameters to `%s' "
"constructor",
constructor_type->name);
return ir_call::get_error_instruction(ctx);
}
if (!result->type->is_numeric() && !result->type->is_boolean()) {
_mesa_glsl_error(& loc, state, "cannot construct `%s' from a "
"non-numeric data type",
constructor_type->name);
return ir_call::get_error_instruction(ctx);
}
/* Count the number of matrix and nonmatrix parameters. This
* is used below to enforce some of the constructor rules.
*/
if (result->type->is_matrix())
matrix_parameters++;
else
nonmatrix_parameters++;
actual_parameters.push_tail(result);
components_used += result->type->components();
}
/* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
*
* "It is an error to construct matrices from other matrices. This
* is reserved for future use."
*/
if ((state->language_version <= 110) && (matrix_parameters > 0)
&& constructor_type->is_matrix()) {
_mesa_glsl_error(& loc, state, "cannot construct `%s' from a "
"matrix in GLSL 1.10",
constructor_type->name);
return ir_call::get_error_instruction(ctx);
}
/* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
*
* "If a matrix argument is given to a matrix constructor, it is
* an error to have any other arguments."
*/
if ((matrix_parameters > 0)
&& ((matrix_parameters + nonmatrix_parameters) > 1)
&& constructor_type->is_matrix()) {
_mesa_glsl_error(& loc, state, "for matrix `%s' constructor, "
"matrix must be only parameter",
constructor_type->name);
return ir_call::get_error_instruction(ctx);
}
/* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
*
* "In these cases, there must be enough components provided in the
* arguments to provide an initializer for every component in the
* constructed value."
*/
if ((components_used < type_components) && (components_used != 1)) {
_mesa_glsl_error(& loc, state, "too few components to construct "
"`%s'",
constructor_type->name);
return ir_call::get_error_instruction(ctx);
}
/* Later, we cast each parameter to the same base type as the
* constructor. Since there are no non-floating point matrices, we
* need to break them up into a series of column vectors.
*/
if (constructor_type->base_type != GLSL_TYPE_FLOAT) {
foreach_list_safe(n, &actual_parameters) {
ir_rvalue *matrix = (ir_rvalue *) n;
if (!matrix->type->is_matrix())
continue;
/* Create a temporary containing the matrix. */
ir_variable *var = new(ctx) ir_variable(matrix->type, "matrix_tmp",
ir_var_temporary);
instructions->push_tail(var);
instructions->push_tail(new(ctx) ir_assignment(new(ctx)
ir_dereference_variable(var), matrix, NULL));
var->constant_value = matrix->constant_expression_value();
/* Replace the matrix with dereferences of its columns. */
for (int i = 0; i < matrix->type->matrix_columns; i++) {
matrix->insert_before(new (ctx) ir_dereference_array(var,
new(ctx) ir_constant(i)));
}
matrix->remove();
}
}
bool all_parameters_are_constant = true;
/* Type cast each parameter and, if possible, fold constants.*/
foreach_list_safe(n, &actual_parameters) {
ir_rvalue *ir = (ir_rvalue *) n;
const glsl_type *desired_type =
glsl_type::get_instance(constructor_type->base_type,
ir->type->vector_elements,
ir->type->matrix_columns);
ir_rvalue *result = convert_component(ir, desired_type);
/* Attempt to convert the parameter to a constant valued expression.
* After doing so, track whether or not all the parameters to the
* constructor are trivially constant valued expressions.
*/
ir_rvalue *const constant = result->constant_expression_value();
if (constant != NULL)
result = constant;
else
all_parameters_are_constant = false;
if (result != ir) {
ir->replace_with(result);
}
}
/* If all of the parameters are trivially constant, create a
* constant representing the complete collection of parameters.
*/
if (all_parameters_are_constant) {
if (components_used >= type_components)
return new(ctx) ir_constant(constructor_type,
& actual_parameters);
/* The above case must handle all scalar constructors.
*/
assert(constructor_type->is_vector()
|| constructor_type->is_matrix());
/* Constructors with exactly one component are special for
* vectors and matrices. For vectors it causes all elements of
* the vector to be filled with the value. For matrices it
* causes the matrix to be filled with 0 and the diagonal to be
* filled with the value.
*/
ir_constant_data data;
ir_constant *const initializer =
(ir_constant *) actual_parameters.head;
if (constructor_type->is_matrix())
generate_constructor_matrix(constructor_type, initializer,
&data);
else
generate_constructor_vector(constructor_type, initializer,
&data);
return new(ctx) ir_constant(constructor_type, &data);
} else if (constructor_type->is_scalar()) {
return dereference_component((ir_rvalue *) actual_parameters.head,
0);
} else if (constructor_type->is_vector()) {
return emit_inline_vector_constructor(constructor_type,
instructions,
&actual_parameters,
ctx);
} else {
assert(constructor_type->is_matrix());
return emit_inline_matrix_constructor(constructor_type,
instructions,
&actual_parameters,
ctx);
}
} else {
const ast_expression *id = subexpressions[0];
YYLTYPE loc = id->get_location();
exec_list actual_parameters;
process_parameters(instructions, &actual_parameters, &this->expressions,
state);
const glsl_type *const type =
state->symbols->get_type(id->primary_expression.identifier);
if ((type != NULL) && type->is_record()) {
ir_constant *constant =
constant_record_constructor(type, &loc, &actual_parameters, state);
if (constant != NULL)
return constant;
}
return match_function_by_name(instructions,
id->primary_expression.identifier, & loc,
&actual_parameters, state);
}
return ir_call::get_error_instruction(ctx);
}