compiler: Bring over glsl compiler from alchemist-10.2.6+steamos-LunarG-1.1
diff --git a/icd/intel/compiler/shader/ir.cpp b/icd/intel/compiler/shader/ir.cpp
new file mode 100644
index 0000000..ba8a839
--- /dev/null
+++ b/icd/intel/compiler/shader/ir.cpp
@@ -0,0 +1,1896 @@
+/*
+ * 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 <string.h>
+#include "main/core.h" /* for MAX2 */
+#include "ir.h"
+#include "ir_visitor.h"
+#include "glsl_types.h"
+
+ir_rvalue::ir_rvalue()
+{
+ this->type = glsl_type::error_type;
+}
+
+bool ir_rvalue::is_zero() const
+{
+ return false;
+}
+
+bool ir_rvalue::is_one() const
+{
+ return false;
+}
+
+bool ir_rvalue::is_negative_one() const
+{
+ return false;
+}
+
+bool ir_rvalue::is_basis() const
+{
+ return false;
+}
+
+/**
+ * Modify the swizzle make to move one component to another
+ *
+ * \param m IR swizzle to be modified
+ * \param from Component in the RHS that is to be swizzled
+ * \param to Desired swizzle location of \c from
+ */
+static void
+update_rhs_swizzle(ir_swizzle_mask &m, unsigned from, unsigned to)
+{
+ switch (to) {
+ case 0: m.x = from; break;
+ case 1: m.y = from; break;
+ case 2: m.z = from; break;
+ case 3: m.w = from; break;
+ default: assert(!"Should not get here.");
+ }
+
+ m.num_components = MAX2(m.num_components, (to + 1));
+}
+
+void
+ir_assignment::set_lhs(ir_rvalue *lhs)
+{
+ void *mem_ctx = this;
+ bool swizzled = false;
+
+ while (lhs != NULL) {
+ ir_swizzle *swiz = lhs->as_swizzle();
+
+ if (swiz == NULL)
+ break;
+
+ unsigned write_mask = 0;
+ ir_swizzle_mask rhs_swiz = { 0, 0, 0, 0, 0, 0 };
+
+ for (unsigned i = 0; i < swiz->mask.num_components; i++) {
+ unsigned c = 0;
+
+ switch (i) {
+ case 0: c = swiz->mask.x; break;
+ case 1: c = swiz->mask.y; break;
+ case 2: c = swiz->mask.z; break;
+ case 3: c = swiz->mask.w; break;
+ default: assert(!"Should not get here.");
+ }
+
+ write_mask |= (((this->write_mask >> i) & 1) << c);
+ update_rhs_swizzle(rhs_swiz, i, c);
+ }
+
+ this->write_mask = write_mask;
+ lhs = swiz->val;
+
+ this->rhs = new(mem_ctx) ir_swizzle(this->rhs, rhs_swiz);
+ swizzled = true;
+ }
+
+ if (swizzled) {
+ /* Now, RHS channels line up with the LHS writemask. Collapse it
+ * to just the channels that will be written.
+ */
+ ir_swizzle_mask rhs_swiz = { 0, 0, 0, 0, 0, 0 };
+ int rhs_chan = 0;
+ for (int i = 0; i < 4; i++) {
+ if (write_mask & (1 << i))
+ update_rhs_swizzle(rhs_swiz, i, rhs_chan++);
+ }
+ this->rhs = new(mem_ctx) ir_swizzle(this->rhs, rhs_swiz);
+ }
+
+ assert((lhs == NULL) || lhs->as_dereference());
+
+ this->lhs = (ir_dereference *) lhs;
+}
+
+ir_variable *
+ir_assignment::whole_variable_written()
+{
+ ir_variable *v = this->lhs->whole_variable_referenced();
+
+ if (v == NULL)
+ return NULL;
+
+ if (v->type->is_scalar())
+ return v;
+
+ if (v->type->is_vector()) {
+ const unsigned mask = (1U << v->type->vector_elements) - 1;
+
+ if (mask != this->write_mask)
+ return NULL;
+ }
+
+ /* Either all the vector components are assigned or the variable is some
+ * composite type (and the whole thing is assigned.
+ */
+ return v;
+}
+
+ir_assignment::ir_assignment(ir_dereference *lhs, ir_rvalue *rhs,
+ ir_rvalue *condition, unsigned write_mask)
+{
+ this->ir_type = ir_type_assignment;
+ this->condition = condition;
+ this->rhs = rhs;
+ this->lhs = lhs;
+ this->write_mask = write_mask;
+
+ if (lhs->type->is_scalar() || lhs->type->is_vector()) {
+ int lhs_components = 0;
+ for (int i = 0; i < 4; i++) {
+ if (write_mask & (1 << i))
+ lhs_components++;
+ }
+
+ assert(lhs_components == this->rhs->type->vector_elements);
+ }
+}
+
+ir_assignment::ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs,
+ ir_rvalue *condition)
+{
+ this->ir_type = ir_type_assignment;
+ this->condition = condition;
+ this->rhs = rhs;
+
+ /* If the RHS is a vector type, assume that all components of the vector
+ * type are being written to the LHS. The write mask comes from the RHS
+ * because we can have a case where the LHS is a vec4 and the RHS is a
+ * vec3. In that case, the assignment is:
+ *
+ * (assign (...) (xyz) (var_ref lhs) (var_ref rhs))
+ */
+ if (rhs->type->is_vector())
+ this->write_mask = (1U << rhs->type->vector_elements) - 1;
+ else if (rhs->type->is_scalar())
+ this->write_mask = 1;
+ else
+ this->write_mask = 0;
+
+ this->set_lhs(lhs);
+}
+
+ir_expression::ir_expression(int op, const struct glsl_type *type,
+ ir_rvalue *op0, ir_rvalue *op1,
+ ir_rvalue *op2, ir_rvalue *op3)
+{
+ this->ir_type = ir_type_expression;
+ this->type = type;
+ this->operation = ir_expression_operation(op);
+ this->operands[0] = op0;
+ this->operands[1] = op1;
+ this->operands[2] = op2;
+ this->operands[3] = op3;
+#ifndef NDEBUG
+ int num_operands = get_num_operands(this->operation);
+ for (int i = num_operands; i < 4; i++) {
+ assert(this->operands[i] == NULL);
+ }
+#endif
+}
+
+ir_expression::ir_expression(int op, ir_rvalue *op0)
+{
+ this->ir_type = ir_type_expression;
+
+ this->operation = ir_expression_operation(op);
+ this->operands[0] = op0;
+ this->operands[1] = NULL;
+ this->operands[2] = NULL;
+ this->operands[3] = NULL;
+
+ assert(op <= ir_last_unop);
+
+ switch (this->operation) {
+ case ir_unop_bit_not:
+ case ir_unop_logic_not:
+ case ir_unop_neg:
+ case ir_unop_abs:
+ case ir_unop_sign:
+ case ir_unop_rcp:
+ case ir_unop_rsq:
+ case ir_unop_sqrt:
+ case ir_unop_exp:
+ case ir_unop_log:
+ case ir_unop_exp2:
+ case ir_unop_log2:
+ case ir_unop_trunc:
+ case ir_unop_ceil:
+ case ir_unop_floor:
+ case ir_unop_fract:
+ case ir_unop_round_even:
+ case ir_unop_sin:
+ case ir_unop_cos:
+ case ir_unop_sin_reduced:
+ case ir_unop_cos_reduced:
+ case ir_unop_dFdx:
+ case ir_unop_dFdy:
+ case ir_unop_bitfield_reverse:
+ this->type = op0->type;
+ break;
+
+ case ir_unop_f2i:
+ case ir_unop_b2i:
+ case ir_unop_u2i:
+ case ir_unop_bitcast_f2i:
+ case ir_unop_bit_count:
+ case ir_unop_find_msb:
+ case ir_unop_find_lsb:
+ this->type = glsl_type::get_instance(GLSL_TYPE_INT,
+ op0->type->vector_elements, 1);
+ break;
+
+ case ir_unop_b2f:
+ case ir_unop_i2f:
+ case ir_unop_u2f:
+ case ir_unop_bitcast_i2f:
+ case ir_unop_bitcast_u2f:
+ this->type = glsl_type::get_instance(GLSL_TYPE_FLOAT,
+ op0->type->vector_elements, 1);
+ break;
+
+ case ir_unop_f2b:
+ case ir_unop_i2b:
+ this->type = glsl_type::get_instance(GLSL_TYPE_BOOL,
+ op0->type->vector_elements, 1);
+ break;
+
+ case ir_unop_i2u:
+ case ir_unop_f2u:
+ case ir_unop_bitcast_f2u:
+ this->type = glsl_type::get_instance(GLSL_TYPE_UINT,
+ op0->type->vector_elements, 1);
+ break;
+
+ case ir_unop_noise:
+ case ir_unop_unpack_half_2x16_split_x:
+ case ir_unop_unpack_half_2x16_split_y:
+ this->type = glsl_type::float_type;
+ break;
+
+ case ir_unop_any:
+ this->type = glsl_type::bool_type;
+ break;
+
+ case ir_unop_pack_snorm_2x16:
+ case ir_unop_pack_snorm_4x8:
+ case ir_unop_pack_unorm_2x16:
+ case ir_unop_pack_unorm_4x8:
+ case ir_unop_pack_half_2x16:
+ this->type = glsl_type::uint_type;
+ break;
+
+ case ir_unop_unpack_snorm_2x16:
+ case ir_unop_unpack_unorm_2x16:
+ case ir_unop_unpack_half_2x16:
+ this->type = glsl_type::vec2_type;
+ break;
+
+ case ir_unop_unpack_snorm_4x8:
+ case ir_unop_unpack_unorm_4x8:
+ this->type = glsl_type::vec4_type;
+ break;
+
+ default:
+ assert(!"not reached: missing automatic type setup for ir_expression");
+ this->type = op0->type;
+ break;
+ }
+}
+
+ir_expression::ir_expression(int op, ir_rvalue *op0, ir_rvalue *op1)
+{
+ this->ir_type = ir_type_expression;
+
+ this->operation = ir_expression_operation(op);
+ this->operands[0] = op0;
+ this->operands[1] = op1;
+ this->operands[2] = NULL;
+ this->operands[3] = NULL;
+
+ assert(op > ir_last_unop);
+
+ switch (this->operation) {
+ case ir_binop_all_equal:
+ case ir_binop_any_nequal:
+ this->type = glsl_type::bool_type;
+ break;
+
+ case ir_binop_add:
+ case ir_binop_sub:
+ case ir_binop_min:
+ case ir_binop_max:
+ case ir_binop_pow:
+ case ir_binop_mul:
+ case ir_binop_div:
+ case ir_binop_mod:
+ if (op0->type->is_scalar()) {
+ this->type = op1->type;
+ } else if (op1->type->is_scalar()) {
+ this->type = op0->type;
+ } else {
+ /* FINISHME: matrix types */
+ assert(!op0->type->is_matrix() && !op1->type->is_matrix());
+ assert(op0->type == op1->type);
+ this->type = op0->type;
+ }
+ break;
+
+ case ir_binop_logic_and:
+ case ir_binop_logic_xor:
+ case ir_binop_logic_or:
+ case ir_binop_bit_and:
+ case ir_binop_bit_xor:
+ case ir_binop_bit_or:
+ assert(!op0->type->is_matrix());
+ assert(!op1->type->is_matrix());
+ if (op0->type->is_scalar()) {
+ this->type = op1->type;
+ } else if (op1->type->is_scalar()) {
+ this->type = op0->type;
+ } else {
+ assert(op0->type->vector_elements == op1->type->vector_elements);
+ this->type = op0->type;
+ }
+ break;
+
+ case ir_binop_equal:
+ case ir_binop_nequal:
+ case ir_binop_lequal:
+ case ir_binop_gequal:
+ case ir_binop_less:
+ case ir_binop_greater:
+ assert(op0->type == op1->type);
+ this->type = glsl_type::get_instance(GLSL_TYPE_BOOL,
+ op0->type->vector_elements, 1);
+ break;
+
+ case ir_binop_dot:
+ this->type = glsl_type::float_type;
+ break;
+
+ case ir_binop_pack_half_2x16_split:
+ this->type = glsl_type::uint_type;
+ break;
+
+ case ir_binop_imul_high:
+ case ir_binop_carry:
+ case ir_binop_borrow:
+ case ir_binop_lshift:
+ case ir_binop_rshift:
+ case ir_binop_bfm:
+ case ir_binop_ldexp:
+ this->type = op0->type;
+ break;
+
+ case ir_binop_vector_extract:
+ this->type = op0->type->get_scalar_type();
+ break;
+
+ default:
+ assert(!"not reached: missing automatic type setup for ir_expression");
+ this->type = glsl_type::float_type;
+ }
+}
+
+ir_expression::ir_expression(int op, ir_rvalue *op0, ir_rvalue *op1,
+ ir_rvalue *op2)
+{
+ this->ir_type = ir_type_expression;
+
+ this->operation = ir_expression_operation(op);
+ this->operands[0] = op0;
+ this->operands[1] = op1;
+ this->operands[2] = op2;
+ this->operands[3] = NULL;
+
+ assert(op > ir_last_binop && op <= ir_last_triop);
+
+ switch (this->operation) {
+ case ir_triop_fma:
+ case ir_triop_lrp:
+ case ir_triop_bitfield_extract:
+ case ir_triop_vector_insert:
+ this->type = op0->type;
+ break;
+
+ case ir_triop_bfi:
+ case ir_triop_csel:
+ this->type = op1->type;
+ break;
+
+ default:
+ assert(!"not reached: missing automatic type setup for ir_expression");
+ this->type = glsl_type::float_type;
+ }
+}
+
+unsigned int
+ir_expression::get_num_operands(ir_expression_operation op)
+{
+ assert(op <= ir_last_opcode);
+
+ if (op <= ir_last_unop)
+ return 1;
+
+ if (op <= ir_last_binop)
+ return 2;
+
+ if (op <= ir_last_triop)
+ return 3;
+
+ if (op <= ir_last_quadop)
+ return 4;
+
+ assert(false);
+ return 0;
+}
+
+static const char *const operator_strs[] = {
+ "~",
+ "!",
+ "neg",
+ "abs",
+ "sign",
+ "rcp",
+ "rsq",
+ "sqrt",
+ "exp",
+ "log",
+ "exp2",
+ "log2",
+ "f2i",
+ "f2u",
+ "i2f",
+ "f2b",
+ "b2f",
+ "i2b",
+ "b2i",
+ "u2f",
+ "i2u",
+ "u2i",
+ "bitcast_i2f",
+ "bitcast_f2i",
+ "bitcast_u2f",
+ "bitcast_f2u",
+ "any",
+ "trunc",
+ "ceil",
+ "floor",
+ "fract",
+ "round_even",
+ "sin",
+ "cos",
+ "sin_reduced",
+ "cos_reduced",
+ "dFdx",
+ "dFdy",
+ "packSnorm2x16",
+ "packSnorm4x8",
+ "packUnorm2x16",
+ "packUnorm4x8",
+ "packHalf2x16",
+ "unpackSnorm2x16",
+ "unpackSnorm4x8",
+ "unpackUnorm2x16",
+ "unpackUnorm4x8",
+ "unpackHalf2x16",
+ "unpackHalf2x16_split_x",
+ "unpackHalf2x16_split_y",
+ "bitfield_reverse",
+ "bit_count",
+ "find_msb",
+ "find_lsb",
+ "noise",
+ "+",
+ "-",
+ "*",
+ "imul_high",
+ "/",
+ "carry",
+ "borrow",
+ "%",
+ "<",
+ ">",
+ "<=",
+ ">=",
+ "==",
+ "!=",
+ "all_equal",
+ "any_nequal",
+ "<<",
+ ">>",
+ "&",
+ "^",
+ "|",
+ "&&",
+ "^^",
+ "||",
+ "dot",
+ "min",
+ "max",
+ "pow",
+ "packHalf2x16_split",
+ "bfm",
+ "ubo_load",
+ "ldexp",
+ "vector_extract",
+ "fma",
+ "lrp",
+ "csel",
+ "bfi",
+ "bitfield_extract",
+ "vector_insert",
+ "bitfield_insert",
+ "vector",
+};
+
+const char *ir_expression::operator_string(ir_expression_operation op)
+{
+ assert((unsigned int) op < Elements(operator_strs));
+ assert(Elements(operator_strs) == (ir_quadop_vector + 1));
+ return operator_strs[op];
+}
+
+const char *ir_expression::operator_string()
+{
+ return operator_string(this->operation);
+}
+
+const char*
+depth_layout_string(ir_depth_layout layout)
+{
+ switch(layout) {
+ case ir_depth_layout_none: return "";
+ case ir_depth_layout_any: return "depth_any";
+ case ir_depth_layout_greater: return "depth_greater";
+ case ir_depth_layout_less: return "depth_less";
+ case ir_depth_layout_unchanged: return "depth_unchanged";
+
+ default:
+ assert(0);
+ return "";
+ }
+}
+
+ir_expression_operation
+ir_expression::get_operator(const char *str)
+{
+ const int operator_count = sizeof(operator_strs) / sizeof(operator_strs[0]);
+ for (int op = 0; op < operator_count; op++) {
+ if (strcmp(str, operator_strs[op]) == 0)
+ return (ir_expression_operation) op;
+ }
+ return (ir_expression_operation) -1;
+}
+
+ir_constant::ir_constant()
+{
+ this->ir_type = ir_type_constant;
+}
+
+ir_constant::ir_constant(const struct glsl_type *type,
+ const ir_constant_data *data)
+{
+ assert((type->base_type >= GLSL_TYPE_UINT)
+ && (type->base_type <= GLSL_TYPE_BOOL));
+
+ this->ir_type = ir_type_constant;
+ this->type = type;
+ memcpy(& this->value, data, sizeof(this->value));
+}
+
+ir_constant::ir_constant(float f, unsigned vector_elements)
+{
+ assert(vector_elements <= 4);
+ this->ir_type = ir_type_constant;
+ this->type = glsl_type::get_instance(GLSL_TYPE_FLOAT, vector_elements, 1);
+ for (unsigned i = 0; i < vector_elements; i++) {
+ this->value.f[i] = f;
+ }
+ for (unsigned i = vector_elements; i < 16; i++) {
+ this->value.f[i] = 0;
+ }
+}
+
+ir_constant::ir_constant(unsigned int u, unsigned vector_elements)
+{
+ assert(vector_elements <= 4);
+ this->ir_type = ir_type_constant;
+ this->type = glsl_type::get_instance(GLSL_TYPE_UINT, vector_elements, 1);
+ for (unsigned i = 0; i < vector_elements; i++) {
+ this->value.u[i] = u;
+ }
+ for (unsigned i = vector_elements; i < 16; i++) {
+ this->value.u[i] = 0;
+ }
+}
+
+ir_constant::ir_constant(int integer, unsigned vector_elements)
+{
+ assert(vector_elements <= 4);
+ this->ir_type = ir_type_constant;
+ this->type = glsl_type::get_instance(GLSL_TYPE_INT, vector_elements, 1);
+ for (unsigned i = 0; i < vector_elements; i++) {
+ this->value.i[i] = integer;
+ }
+ for (unsigned i = vector_elements; i < 16; i++) {
+ this->value.i[i] = 0;
+ }
+}
+
+ir_constant::ir_constant(bool b, unsigned vector_elements)
+{
+ assert(vector_elements <= 4);
+ this->ir_type = ir_type_constant;
+ this->type = glsl_type::get_instance(GLSL_TYPE_BOOL, vector_elements, 1);
+ for (unsigned i = 0; i < vector_elements; i++) {
+ this->value.b[i] = b;
+ }
+ for (unsigned i = vector_elements; i < 16; i++) {
+ this->value.b[i] = false;
+ }
+}
+
+ir_constant::ir_constant(const ir_constant *c, unsigned i)
+{
+ this->ir_type = ir_type_constant;
+ this->type = c->type->get_base_type();
+
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT: this->value.u[0] = c->value.u[i]; break;
+ case GLSL_TYPE_INT: this->value.i[0] = c->value.i[i]; break;
+ case GLSL_TYPE_FLOAT: this->value.f[0] = c->value.f[i]; break;
+ case GLSL_TYPE_BOOL: this->value.b[0] = c->value.b[i]; break;
+ default: assert(!"Should not get here."); break;
+ }
+}
+
+ir_constant::ir_constant(const struct glsl_type *type, exec_list *value_list)
+{
+ this->ir_type = ir_type_constant;
+ this->type = type;
+
+ assert(type->is_scalar() || type->is_vector() || type->is_matrix()
+ || type->is_record() || type->is_array());
+
+ if (type->is_array()) {
+ this->array_elements = ralloc_array(this, ir_constant *, type->length);
+ unsigned i = 0;
+ foreach_list(node, value_list) {
+ ir_constant *value = (ir_constant *) node;
+ assert(value->as_constant() != NULL);
+
+ this->array_elements[i++] = value;
+ }
+ return;
+ }
+
+ /* If the constant is a record, the types of each of the entries in
+ * value_list must be a 1-for-1 match with the structure components. Each
+ * entry must also be a constant. Just move the nodes from the value_list
+ * to the list in the ir_constant.
+ */
+ /* FINISHME: Should there be some type checking and / or assertions here? */
+ /* FINISHME: Should the new constant take ownership of the nodes from
+ * FINISHME: value_list, or should it make copies?
+ */
+ if (type->is_record()) {
+ value_list->move_nodes_to(& this->components);
+ return;
+ }
+
+ for (unsigned i = 0; i < 16; i++) {
+ this->value.u[i] = 0;
+ }
+
+ ir_constant *value = (ir_constant *) (value_list->head);
+
+ /* Constructors with exactly one scalar argument are special for vectors
+ * and matrices. For vectors, the scalar value is replicated to fill all
+ * the components. For matrices, the scalar fills the components of the
+ * diagonal while the rest is filled with 0.
+ */
+ if (value->type->is_scalar() && value->next->is_tail_sentinel()) {
+ if (type->is_matrix()) {
+ /* Matrix - fill diagonal (rest is already set to 0) */
+ assert(type->base_type == GLSL_TYPE_FLOAT);
+ for (unsigned i = 0; i < type->matrix_columns; i++)
+ this->value.f[i * type->vector_elements + i] = value->value.f[0];
+ } else {
+ /* Vector or scalar - fill all components */
+ switch (type->base_type) {
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ for (unsigned i = 0; i < type->components(); i++)
+ this->value.u[i] = value->value.u[0];
+ break;
+ case GLSL_TYPE_FLOAT:
+ for (unsigned i = 0; i < type->components(); i++)
+ this->value.f[i] = value->value.f[0];
+ break;
+ case GLSL_TYPE_BOOL:
+ for (unsigned i = 0; i < type->components(); i++)
+ this->value.b[i] = value->value.b[0];
+ break;
+ default:
+ assert(!"Should not get here.");
+ break;
+ }
+ }
+ return;
+ }
+
+ if (type->is_matrix() && value->type->is_matrix()) {
+ assert(value->next->is_tail_sentinel());
+
+ /* From section 5.4.2 of the GLSL 1.20 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."
+ */
+ unsigned cols = MIN2(type->matrix_columns, value->type->matrix_columns);
+ unsigned rows = MIN2(type->vector_elements, value->type->vector_elements);
+ for (unsigned i = 0; i < cols; i++) {
+ for (unsigned j = 0; j < rows; j++) {
+ const unsigned src = i * value->type->vector_elements + j;
+ const unsigned dst = i * type->vector_elements + j;
+ this->value.f[dst] = value->value.f[src];
+ }
+ }
+
+ /* "All other components will be initialized to the identity matrix." */
+ for (unsigned i = cols; i < type->matrix_columns; i++)
+ this->value.f[i * type->vector_elements + i] = 1.0;
+
+ return;
+ }
+
+ /* Use each component from each entry in the value_list to initialize one
+ * component of the constant being constructed.
+ */
+ for (unsigned i = 0; i < type->components(); /* empty */) {
+ assert(value->as_constant() != NULL);
+ assert(!value->is_tail_sentinel());
+
+ for (unsigned j = 0; j < value->type->components(); j++) {
+ switch (type->base_type) {
+ case GLSL_TYPE_UINT:
+ this->value.u[i] = value->get_uint_component(j);
+ break;
+ case GLSL_TYPE_INT:
+ this->value.i[i] = value->get_int_component(j);
+ break;
+ case GLSL_TYPE_FLOAT:
+ this->value.f[i] = value->get_float_component(j);
+ break;
+ case GLSL_TYPE_BOOL:
+ this->value.b[i] = value->get_bool_component(j);
+ break;
+ default:
+ /* FINISHME: What to do? Exceptions are not the answer.
+ */
+ break;
+ }
+
+ i++;
+ if (i >= type->components())
+ break;
+ }
+
+ value = (ir_constant *) value->next;
+ }
+}
+
+ir_constant *
+ir_constant::zero(void *mem_ctx, const glsl_type *type)
+{
+ assert(type->is_scalar() || type->is_vector() || type->is_matrix()
+ || type->is_record() || type->is_array());
+
+ ir_constant *c = new(mem_ctx) ir_constant;
+ c->type = type;
+ memset(&c->value, 0, sizeof(c->value));
+
+ if (type->is_array()) {
+ c->array_elements = ralloc_array(c, ir_constant *, type->length);
+
+ for (unsigned i = 0; i < type->length; i++)
+ c->array_elements[i] = ir_constant::zero(c, type->element_type());
+ }
+
+ if (type->is_record()) {
+ for (unsigned i = 0; i < type->length; i++) {
+ ir_constant *comp = ir_constant::zero(mem_ctx, type->fields.structure[i].type);
+ c->components.push_tail(comp);
+ }
+ }
+
+ return c;
+}
+
+bool
+ir_constant::get_bool_component(unsigned i) const
+{
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT: return this->value.u[i] != 0;
+ case GLSL_TYPE_INT: return this->value.i[i] != 0;
+ case GLSL_TYPE_FLOAT: return ((int)this->value.f[i]) != 0;
+ case GLSL_TYPE_BOOL: return this->value.b[i];
+ default: assert(!"Should not get here."); break;
+ }
+
+ /* Must return something to make the compiler happy. This is clearly an
+ * error case.
+ */
+ return false;
+}
+
+float
+ir_constant::get_float_component(unsigned i) const
+{
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT: return (float) this->value.u[i];
+ case GLSL_TYPE_INT: return (float) this->value.i[i];
+ case GLSL_TYPE_FLOAT: return this->value.f[i];
+ case GLSL_TYPE_BOOL: return this->value.b[i] ? 1.0f : 0.0f;
+ default: assert(!"Should not get here."); break;
+ }
+
+ /* Must return something to make the compiler happy. This is clearly an
+ * error case.
+ */
+ return 0.0;
+}
+
+int
+ir_constant::get_int_component(unsigned i) const
+{
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT: return this->value.u[i];
+ case GLSL_TYPE_INT: return this->value.i[i];
+ case GLSL_TYPE_FLOAT: return (int) this->value.f[i];
+ case GLSL_TYPE_BOOL: return this->value.b[i] ? 1 : 0;
+ default: assert(!"Should not get here."); break;
+ }
+
+ /* Must return something to make the compiler happy. This is clearly an
+ * error case.
+ */
+ return 0;
+}
+
+unsigned
+ir_constant::get_uint_component(unsigned i) const
+{
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT: return this->value.u[i];
+ case GLSL_TYPE_INT: return this->value.i[i];
+ case GLSL_TYPE_FLOAT: return (unsigned) this->value.f[i];
+ case GLSL_TYPE_BOOL: return this->value.b[i] ? 1 : 0;
+ default: assert(!"Should not get here."); break;
+ }
+
+ /* Must return something to make the compiler happy. This is clearly an
+ * error case.
+ */
+ return 0;
+}
+
+ir_constant *
+ir_constant::get_array_element(unsigned i) const
+{
+ assert(this->type->is_array());
+
+ /* From page 35 (page 41 of the PDF) of the GLSL 1.20 spec:
+ *
+ * "Behavior is undefined if a shader subscripts an array with an index
+ * less than 0 or greater than or equal to the size the array was
+ * declared with."
+ *
+ * Most out-of-bounds accesses are removed before things could get this far.
+ * There are cases where non-constant array index values can get constant
+ * folded.
+ */
+ if (int(i) < 0)
+ i = 0;
+ else if (i >= this->type->length)
+ i = this->type->length - 1;
+
+ return array_elements[i];
+}
+
+ir_constant *
+ir_constant::get_record_field(const char *name)
+{
+ int idx = this->type->field_index(name);
+
+ if (idx < 0)
+ return NULL;
+
+ if (this->components.is_empty())
+ return NULL;
+
+ exec_node *node = this->components.head;
+ for (int i = 0; i < idx; i++) {
+ node = node->next;
+
+ /* If the end of the list is encountered before the element matching the
+ * requested field is found, return NULL.
+ */
+ if (node->is_tail_sentinel())
+ return NULL;
+ }
+
+ return (ir_constant *) node;
+}
+
+void
+ir_constant::copy_offset(ir_constant *src, int offset)
+{
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ case GLSL_TYPE_FLOAT:
+ case GLSL_TYPE_BOOL: {
+ unsigned int size = src->type->components();
+ assert (size <= this->type->components() - offset);
+ for (unsigned int i=0; i<size; i++) {
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT:
+ value.u[i+offset] = src->get_uint_component(i);
+ break;
+ case GLSL_TYPE_INT:
+ value.i[i+offset] = src->get_int_component(i);
+ break;
+ case GLSL_TYPE_FLOAT:
+ value.f[i+offset] = src->get_float_component(i);
+ break;
+ case GLSL_TYPE_BOOL:
+ value.b[i+offset] = src->get_bool_component(i);
+ break;
+ default: // Shut up the compiler
+ break;
+ }
+ }
+ break;
+ }
+
+ case GLSL_TYPE_STRUCT: {
+ assert (src->type == this->type);
+ this->components.make_empty();
+ foreach_list(node, &src->components) {
+ ir_constant *const orig = (ir_constant *) node;
+
+ this->components.push_tail(orig->clone(this, NULL));
+ }
+ break;
+ }
+
+ case GLSL_TYPE_ARRAY: {
+ assert (src->type == this->type);
+ for (unsigned i = 0; i < this->type->length; i++) {
+ this->array_elements[i] = src->array_elements[i]->clone(this, NULL);
+ }
+ break;
+ }
+
+ default:
+ assert(!"Should not get here.");
+ break;
+ }
+}
+
+void
+ir_constant::copy_masked_offset(ir_constant *src, int offset, unsigned int mask)
+{
+ assert (!type->is_array() && !type->is_record());
+
+ if (!type->is_vector() && !type->is_matrix()) {
+ offset = 0;
+ mask = 1;
+ }
+
+ int id = 0;
+ for (int i=0; i<4; i++) {
+ if (mask & (1 << i)) {
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT:
+ value.u[i+offset] = src->get_uint_component(id++);
+ break;
+ case GLSL_TYPE_INT:
+ value.i[i+offset] = src->get_int_component(id++);
+ break;
+ case GLSL_TYPE_FLOAT:
+ value.f[i+offset] = src->get_float_component(id++);
+ break;
+ case GLSL_TYPE_BOOL:
+ value.b[i+offset] = src->get_bool_component(id++);
+ break;
+ default:
+ assert(!"Should not get here.");
+ return;
+ }
+ }
+ }
+}
+
+bool
+ir_constant::has_value(const ir_constant *c) const
+{
+ if (this->type != c->type)
+ return false;
+
+ if (this->type->is_array()) {
+ for (unsigned i = 0; i < this->type->length; i++) {
+ if (!this->array_elements[i]->has_value(c->array_elements[i]))
+ return false;
+ }
+ return true;
+ }
+
+ if (this->type->base_type == GLSL_TYPE_STRUCT) {
+ const exec_node *a_node = this->components.head;
+ const exec_node *b_node = c->components.head;
+
+ while (!a_node->is_tail_sentinel()) {
+ assert(!b_node->is_tail_sentinel());
+
+ const ir_constant *const a_field = (ir_constant *) a_node;
+ const ir_constant *const b_field = (ir_constant *) b_node;
+
+ if (!a_field->has_value(b_field))
+ return false;
+
+ a_node = a_node->next;
+ b_node = b_node->next;
+ }
+
+ return true;
+ }
+
+ for (unsigned i = 0; i < this->type->components(); i++) {
+ switch (this->type->base_type) {
+ case GLSL_TYPE_UINT:
+ if (this->value.u[i] != c->value.u[i])
+ return false;
+ break;
+ case GLSL_TYPE_INT:
+ if (this->value.i[i] != c->value.i[i])
+ return false;
+ break;
+ case GLSL_TYPE_FLOAT:
+ if (this->value.f[i] != c->value.f[i])
+ return false;
+ break;
+ case GLSL_TYPE_BOOL:
+ if (this->value.b[i] != c->value.b[i])
+ return false;
+ break;
+ default:
+ assert(!"Should not get here.");
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool
+ir_constant::is_value(float f, int i) const
+{
+ if (!this->type->is_scalar() && !this->type->is_vector())
+ return false;
+
+ /* Only accept boolean values for 0/1. */
+ if (int(bool(i)) != i && this->type->is_boolean())
+ return false;
+
+ for (unsigned c = 0; c < this->type->vector_elements; c++) {
+ switch (this->type->base_type) {
+ case GLSL_TYPE_FLOAT:
+ if (this->value.f[c] != f)
+ return false;
+ break;
+ case GLSL_TYPE_INT:
+ if (this->value.i[c] != i)
+ return false;
+ break;
+ case GLSL_TYPE_UINT:
+ if (this->value.u[c] != unsigned(i))
+ return false;
+ break;
+ case GLSL_TYPE_BOOL:
+ if (this->value.b[c] != bool(i))
+ return false;
+ break;
+ default:
+ /* The only other base types are structures, arrays, and samplers.
+ * Samplers cannot be constants, and the others should have been
+ * filtered out above.
+ */
+ assert(!"Should not get here.");
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool
+ir_constant::is_zero() const
+{
+ return is_value(0.0, 0);
+}
+
+bool
+ir_constant::is_one() const
+{
+ return is_value(1.0, 1);
+}
+
+bool
+ir_constant::is_negative_one() const
+{
+ return is_value(-1.0, -1);
+}
+
+bool
+ir_constant::is_basis() const
+{
+ if (!this->type->is_scalar() && !this->type->is_vector())
+ return false;
+
+ if (this->type->is_boolean())
+ return false;
+
+ unsigned ones = 0;
+ for (unsigned c = 0; c < this->type->vector_elements; c++) {
+ switch (this->type->base_type) {
+ case GLSL_TYPE_FLOAT:
+ if (this->value.f[c] == 1.0)
+ ones++;
+ else if (this->value.f[c] != 0.0)
+ return false;
+ break;
+ case GLSL_TYPE_INT:
+ if (this->value.i[c] == 1)
+ ones++;
+ else if (this->value.i[c] != 0)
+ return false;
+ break;
+ case GLSL_TYPE_UINT:
+ if (int(this->value.u[c]) == 1)
+ ones++;
+ else if (int(this->value.u[c]) != 0)
+ return false;
+ break;
+ default:
+ /* The only other base types are structures, arrays, samplers, and
+ * booleans. Samplers cannot be constants, and the others should
+ * have been filtered out above.
+ */
+ assert(!"Should not get here.");
+ return false;
+ }
+ }
+
+ return ones == 1;
+}
+
+bool
+ir_constant::is_uint16_constant() const
+{
+ if (!type->is_integer())
+ return false;
+
+ return value.u[0] < (1 << 16);
+}
+
+ir_loop::ir_loop()
+{
+ this->ir_type = ir_type_loop;
+}
+
+
+ir_dereference_variable::ir_dereference_variable(ir_variable *var)
+{
+ assert(var != NULL);
+
+ this->ir_type = ir_type_dereference_variable;
+ this->var = var;
+ this->type = var->type;
+}
+
+
+ir_dereference_array::ir_dereference_array(ir_rvalue *value,
+ ir_rvalue *array_index)
+{
+ this->ir_type = ir_type_dereference_array;
+ this->array_index = array_index;
+ this->set_array(value);
+}
+
+
+ir_dereference_array::ir_dereference_array(ir_variable *var,
+ ir_rvalue *array_index)
+{
+ void *ctx = ralloc_parent(var);
+
+ this->ir_type = ir_type_dereference_array;
+ this->array_index = array_index;
+ this->set_array(new(ctx) ir_dereference_variable(var));
+}
+
+
+void
+ir_dereference_array::set_array(ir_rvalue *value)
+{
+ assert(value != NULL);
+
+ this->array = value;
+
+ const glsl_type *const vt = this->array->type;
+
+ if (vt->is_array()) {
+ type = vt->element_type();
+ } else if (vt->is_matrix()) {
+ type = vt->column_type();
+ } else if (vt->is_vector()) {
+ type = vt->get_base_type();
+ }
+}
+
+
+ir_dereference_record::ir_dereference_record(ir_rvalue *value,
+ const char *field)
+{
+ assert(value != NULL);
+
+ this->ir_type = ir_type_dereference_record;
+ this->record = value;
+ this->field = ralloc_strdup(this, field);
+ this->type = this->record->type->field_type(field);
+}
+
+
+ir_dereference_record::ir_dereference_record(ir_variable *var,
+ const char *field)
+{
+ void *ctx = ralloc_parent(var);
+
+ this->ir_type = ir_type_dereference_record;
+ this->record = new(ctx) ir_dereference_variable(var);
+ this->field = ralloc_strdup(this, field);
+ this->type = this->record->type->field_type(field);
+}
+
+bool
+ir_dereference::is_lvalue() const
+{
+ ir_variable *var = this->variable_referenced();
+
+ /* Every l-value derference chain eventually ends in a variable.
+ */
+ if ((var == NULL) || var->data.read_only)
+ return false;
+
+ /* From section 4.1.7 of the GLSL 4.40 spec:
+ *
+ * "Opaque variables cannot be treated as l-values; hence cannot
+ * be used as out or inout function parameters, nor can they be
+ * assigned into."
+ */
+ if (this->type->contains_opaque())
+ return false;
+
+ return true;
+}
+
+
+static const char * const tex_opcode_strs[] = { "tex", "txb", "txl", "txd", "txf", "txf_ms", "txs", "lod", "tg4", "query_levels" };
+
+const char *ir_texture::opcode_string()
+{
+ assert((unsigned int) op <=
+ sizeof(tex_opcode_strs) / sizeof(tex_opcode_strs[0]));
+ return tex_opcode_strs[op];
+}
+
+ir_texture_opcode
+ir_texture::get_opcode(const char *str)
+{
+ const int count = sizeof(tex_opcode_strs) / sizeof(tex_opcode_strs[0]);
+ for (int op = 0; op < count; op++) {
+ if (strcmp(str, tex_opcode_strs[op]) == 0)
+ return (ir_texture_opcode) op;
+ }
+ return (ir_texture_opcode) -1;
+}
+
+
+void
+ir_texture::set_sampler(ir_dereference *sampler, const glsl_type *type)
+{
+ assert(sampler != NULL);
+ assert(type != NULL);
+ this->sampler = sampler;
+ this->type = type;
+
+ if (this->op == ir_txs || this->op == ir_query_levels) {
+ assert(type->base_type == GLSL_TYPE_INT);
+ } else if (this->op == ir_lod) {
+ assert(type->vector_elements == 2);
+ assert(type->base_type == GLSL_TYPE_FLOAT);
+ } else {
+ assert(sampler->type->sampler_type == (int) type->base_type);
+ if (sampler->type->sampler_shadow)
+ assert(type->vector_elements == 4 || type->vector_elements == 1);
+ else
+ assert(type->vector_elements == 4);
+ }
+}
+
+
+void
+ir_swizzle::init_mask(const unsigned *comp, unsigned count)
+{
+ assert((count >= 1) && (count <= 4));
+
+ memset(&this->mask, 0, sizeof(this->mask));
+ this->mask.num_components = count;
+
+ unsigned dup_mask = 0;
+ switch (count) {
+ case 4:
+ assert(comp[3] <= 3);
+ dup_mask |= (1U << comp[3])
+ & ((1U << comp[0]) | (1U << comp[1]) | (1U << comp[2]));
+ this->mask.w = comp[3];
+
+ case 3:
+ assert(comp[2] <= 3);
+ dup_mask |= (1U << comp[2])
+ & ((1U << comp[0]) | (1U << comp[1]));
+ this->mask.z = comp[2];
+
+ case 2:
+ assert(comp[1] <= 3);
+ dup_mask |= (1U << comp[1])
+ & ((1U << comp[0]));
+ this->mask.y = comp[1];
+
+ case 1:
+ assert(comp[0] <= 3);
+ this->mask.x = comp[0];
+ }
+
+ this->mask.has_duplicates = dup_mask != 0;
+
+ /* Based on the number of elements in the swizzle and the base type
+ * (i.e., float, int, unsigned, or bool) of the vector being swizzled,
+ * generate the type of the resulting value.
+ */
+ type = glsl_type::get_instance(val->type->base_type, mask.num_components, 1);
+}
+
+ir_swizzle::ir_swizzle(ir_rvalue *val, unsigned x, unsigned y, unsigned z,
+ unsigned w, unsigned count)
+ : val(val)
+{
+ const unsigned components[4] = { x, y, z, w };
+ this->ir_type = ir_type_swizzle;
+ this->init_mask(components, count);
+}
+
+ir_swizzle::ir_swizzle(ir_rvalue *val, const unsigned *comp,
+ unsigned count)
+ : val(val)
+{
+ this->ir_type = ir_type_swizzle;
+ this->init_mask(comp, count);
+}
+
+ir_swizzle::ir_swizzle(ir_rvalue *val, ir_swizzle_mask mask)
+{
+ this->ir_type = ir_type_swizzle;
+ this->val = val;
+ this->mask = mask;
+ this->type = glsl_type::get_instance(val->type->base_type,
+ mask.num_components, 1);
+}
+
+#define X 1
+#define R 5
+#define S 9
+#define I 13
+
+ir_swizzle *
+ir_swizzle::create(ir_rvalue *val, const char *str, unsigned vector_length)
+{
+ void *ctx = ralloc_parent(val);
+
+ /* For each possible swizzle character, this table encodes the value in
+ * \c idx_map that represents the 0th element of the vector. For invalid
+ * swizzle characters (e.g., 'k'), a special value is used that will allow
+ * detection of errors.
+ */
+ static const unsigned char base_idx[26] = {
+ /* a b c d e f g h i j k l m */
+ R, R, I, I, I, I, R, I, I, I, I, I, I,
+ /* n o p q r s t u v w x y z */
+ I, I, S, S, R, S, S, I, I, X, X, X, X
+ };
+
+ /* Each valid swizzle character has an entry in the previous table. This
+ * table encodes the base index encoded in the previous table plus the actual
+ * index of the swizzle character. When processing swizzles, the first
+ * character in the string is indexed in the previous table. Each character
+ * in the string is indexed in this table, and the value found there has the
+ * value form the first table subtracted. The result must be on the range
+ * [0,3].
+ *
+ * For example, the string "wzyx" will get X from the first table. Each of
+ * the charcaters will get X+3, X+2, X+1, and X+0 from this table. After
+ * subtraction, the swizzle values are { 3, 2, 1, 0 }.
+ *
+ * The string "wzrg" will get X from the first table. Each of the characters
+ * will get X+3, X+2, R+0, and R+1 from this table. After subtraction, the
+ * swizzle values are { 3, 2, 4, 5 }. Since 4 and 5 are outside the range
+ * [0,3], the error is detected.
+ */
+ static const unsigned char idx_map[26] = {
+ /* a b c d e f g h i j k l m */
+ R+3, R+2, 0, 0, 0, 0, R+1, 0, 0, 0, 0, 0, 0,
+ /* n o p q r s t u v w x y z */
+ 0, 0, S+2, S+3, R+0, S+0, S+1, 0, 0, X+3, X+0, X+1, X+2
+ };
+
+ int swiz_idx[4] = { 0, 0, 0, 0 };
+ unsigned i;
+
+
+ /* Validate the first character in the swizzle string and look up the base
+ * index value as described above.
+ */
+ if ((str[0] < 'a') || (str[0] > 'z'))
+ return NULL;
+
+ const unsigned base = base_idx[str[0] - 'a'];
+
+
+ for (i = 0; (i < 4) && (str[i] != '\0'); i++) {
+ /* Validate the next character, and, as described above, convert it to a
+ * swizzle index.
+ */
+ if ((str[i] < 'a') || (str[i] > 'z'))
+ return NULL;
+
+ swiz_idx[i] = idx_map[str[i] - 'a'] - base;
+ if ((swiz_idx[i] < 0) || (swiz_idx[i] >= (int) vector_length))
+ return NULL;
+ }
+
+ if (str[i] != '\0')
+ return NULL;
+
+ return new(ctx) ir_swizzle(val, swiz_idx[0], swiz_idx[1], swiz_idx[2],
+ swiz_idx[3], i);
+}
+
+#undef X
+#undef R
+#undef S
+#undef I
+
+ir_variable *
+ir_swizzle::variable_referenced() const
+{
+ return this->val->variable_referenced();
+}
+
+
+ir_variable::ir_variable(const struct glsl_type *type, const char *name,
+ ir_variable_mode mode)
+ : max_ifc_array_access(NULL)
+{
+ this->ir_type = ir_type_variable;
+ this->type = type;
+ this->name = ralloc_strdup(this, name);
+ this->data.explicit_location = false;
+ this->data.has_initializer = false;
+ this->data.location = -1;
+ this->data.location_frac = 0;
+ this->warn_extension = NULL;
+ this->constant_value = NULL;
+ this->constant_initializer = NULL;
+ this->data.origin_upper_left = false;
+ this->data.pixel_center_integer = false;
+ this->data.depth_layout = ir_depth_layout_none;
+ this->data.used = false;
+ this->data.read_only = false;
+ this->data.centroid = false;
+ this->data.sample = false;
+ this->data.invariant = false;
+ this->data.how_declared = ir_var_declared_normally;
+ this->data.mode = mode;
+ this->data.interpolation = INTERP_QUALIFIER_NONE;
+ this->data.max_array_access = 0;
+ this->data.atomic.buffer_index = 0;
+ this->data.atomic.offset = 0;
+ this->data.image.read_only = false;
+ this->data.image.write_only = false;
+ this->data.image.coherent = false;
+ this->data.image._volatile = false;
+ this->data.image.restrict_flag = false;
+
+ if (type != NULL) {
+ if (type->base_type == GLSL_TYPE_SAMPLER)
+ this->data.read_only = true;
+
+ if (type->is_interface())
+ this->init_interface_type(type);
+ else if (type->is_array() && type->fields.array->is_interface())
+ this->init_interface_type(type->fields.array);
+ }
+}
+
+
+const char *
+interpolation_string(unsigned interpolation)
+{
+ switch (interpolation) {
+ case INTERP_QUALIFIER_NONE: return "no";
+ case INTERP_QUALIFIER_SMOOTH: return "smooth";
+ case INTERP_QUALIFIER_FLAT: return "flat";
+ case INTERP_QUALIFIER_NOPERSPECTIVE: return "noperspective";
+ }
+
+ assert(!"Should not get here.");
+ return "";
+}
+
+
+glsl_interp_qualifier
+ir_variable::determine_interpolation_mode(bool flat_shade)
+{
+ if (this->data.interpolation != INTERP_QUALIFIER_NONE)
+ return (glsl_interp_qualifier) this->data.interpolation;
+ int location = this->data.location;
+ bool is_gl_Color =
+ location == VARYING_SLOT_COL0 || location == VARYING_SLOT_COL1;
+ if (flat_shade && is_gl_Color)
+ return INTERP_QUALIFIER_FLAT;
+ else
+ return INTERP_QUALIFIER_SMOOTH;
+}
+
+
+ir_function_signature::ir_function_signature(const glsl_type *return_type,
+ builtin_available_predicate b)
+ : return_type(return_type), is_defined(false), is_intrinsic(false),
+ builtin_avail(b), _function(NULL)
+{
+ this->ir_type = ir_type_function_signature;
+ this->origin = NULL;
+}
+
+
+bool
+ir_function_signature::is_builtin() const
+{
+ return builtin_avail != NULL;
+}
+
+
+bool
+ir_function_signature::is_builtin_available(const _mesa_glsl_parse_state *state) const
+{
+ /* We can't call the predicate without a state pointer, so just say that
+ * the signature is available. At compile time, we need the filtering,
+ * but also receive a valid state pointer. At link time, we're resolving
+ * imported built-in prototypes to their definitions, which will always
+ * be an exact match. So we can skip the filtering.
+ */
+ if (state == NULL)
+ return true;
+
+ assert(builtin_avail != NULL);
+ return builtin_avail(state);
+}
+
+
+static bool
+modes_match(unsigned a, unsigned b)
+{
+ if (a == b)
+ return true;
+
+ /* Accept "in" vs. "const in" */
+ if ((a == ir_var_const_in && b == ir_var_function_in) ||
+ (b == ir_var_const_in && a == ir_var_function_in))
+ return true;
+
+ return false;
+}
+
+
+const char *
+ir_function_signature::qualifiers_match(exec_list *params)
+{
+ /* check that the qualifiers match. */
+ foreach_two_lists(a_node, &this->parameters, b_node, params) {
+ ir_variable *a = (ir_variable *) a_node;
+ ir_variable *b = (ir_variable *) b_node;
+
+ if (a->data.read_only != b->data.read_only ||
+ !modes_match(a->data.mode, b->data.mode) ||
+ a->data.interpolation != b->data.interpolation ||
+ a->data.centroid != b->data.centroid ||
+ a->data.sample != b->data.sample ||
+ a->data.image.read_only != b->data.image.read_only ||
+ a->data.image.write_only != b->data.image.write_only ||
+ a->data.image.coherent != b->data.image.coherent ||
+ a->data.image._volatile != b->data.image._volatile ||
+ a->data.image.restrict_flag != b->data.image.restrict_flag) {
+
+ /* parameter a's qualifiers don't match */
+ return a->name;
+ }
+ }
+ return NULL;
+}
+
+
+void
+ir_function_signature::replace_parameters(exec_list *new_params)
+{
+ /* Destroy all of the previous parameter information. If the previous
+ * parameter information comes from the function prototype, it may either
+ * specify incorrect parameter names or not have names at all.
+ */
+ new_params->move_nodes_to(¶meters);
+}
+
+
+ir_function::ir_function(const char *name)
+{
+ this->ir_type = ir_type_function;
+ this->name = ralloc_strdup(this, name);
+}
+
+
+bool
+ir_function::has_user_signature()
+{
+ foreach_list(n, &this->signatures) {
+ ir_function_signature *const sig = (ir_function_signature *) n;
+ if (!sig->is_builtin())
+ return true;
+ }
+ return false;
+}
+
+
+ir_rvalue *
+ir_rvalue::error_value(void *mem_ctx)
+{
+ ir_rvalue *v = new(mem_ctx) ir_rvalue;
+
+ v->type = glsl_type::error_type;
+ return v;
+}
+
+
+void
+visit_exec_list(exec_list *list, ir_visitor *visitor)
+{
+ foreach_list_safe(n, list) {
+ ((ir_instruction *) n)->accept(visitor);
+ }
+}
+
+
+static void
+steal_memory(ir_instruction *ir, void *new_ctx)
+{
+ ir_variable *var = ir->as_variable();
+ ir_constant *constant = ir->as_constant();
+ if (var != NULL && var->constant_value != NULL)
+ steal_memory(var->constant_value, ir);
+
+ if (var != NULL && var->constant_initializer != NULL)
+ steal_memory(var->constant_initializer, ir);
+
+ /* The components of aggregate constants are not visited by the normal
+ * visitor, so steal their values by hand.
+ */
+ if (constant != NULL) {
+ if (constant->type->is_record()) {
+ foreach_list(n, &constant->components) {
+ ir_constant *field = (ir_constant *) n;
+ steal_memory(field, ir);
+ }
+ } else if (constant->type->is_array()) {
+ for (unsigned int i = 0; i < constant->type->length; i++) {
+ steal_memory(constant->array_elements[i], ir);
+ }
+ }
+ }
+
+ ralloc_steal(new_ctx, ir);
+}
+
+
+void
+reparent_ir(exec_list *list, void *mem_ctx)
+{
+ foreach_list(node, list) {
+ visit_tree((ir_instruction *) node, steal_memory, mem_ctx);
+ }
+}
+
+
+static ir_rvalue *
+try_min_one(ir_rvalue *ir)
+{
+ ir_expression *expr = ir->as_expression();
+
+ if (!expr || expr->operation != ir_binop_min)
+ return NULL;
+
+ if (expr->operands[0]->is_one())
+ return expr->operands[1];
+
+ if (expr->operands[1]->is_one())
+ return expr->operands[0];
+
+ return NULL;
+}
+
+static ir_rvalue *
+try_max_zero(ir_rvalue *ir)
+{
+ ir_expression *expr = ir->as_expression();
+
+ if (!expr || expr->operation != ir_binop_max)
+ return NULL;
+
+ if (expr->operands[0]->is_zero())
+ return expr->operands[1];
+
+ if (expr->operands[1]->is_zero())
+ return expr->operands[0];
+
+ return NULL;
+}
+
+ir_rvalue *
+ir_rvalue::as_rvalue_to_saturate()
+{
+ ir_expression *expr = this->as_expression();
+
+ if (!expr)
+ return NULL;
+
+ ir_rvalue *max_zero = try_max_zero(expr);
+ if (max_zero) {
+ return try_min_one(max_zero);
+ } else {
+ ir_rvalue *min_one = try_min_one(expr);
+ if (min_one) {
+ return try_max_zero(min_one);
+ }
+ }
+
+ return NULL;
+}
+
+
+unsigned
+vertices_per_prim(GLenum prim)
+{
+ switch (prim) {
+ case GL_POINTS:
+ return 1;
+ case GL_LINES:
+ return 2;
+ case GL_TRIANGLES:
+ return 3;
+ case GL_LINES_ADJACENCY:
+ return 4;
+ case GL_TRIANGLES_ADJACENCY:
+ return 6;
+ default:
+ assert(!"Bad primitive");
+ return 3;
+ }
+}
+
+/**
+ * Generate a string describing the mode of a variable
+ */
+const char *
+mode_string(const ir_variable *var)
+{
+ switch (var->data.mode) {
+ case ir_var_auto:
+ return (var->data.read_only) ? "global constant" : "global variable";
+
+ case ir_var_uniform:
+ return "uniform";
+
+ case ir_var_shader_in:
+ return "shader input";
+
+ case ir_var_shader_out:
+ return "shader output";
+
+ case ir_var_function_in:
+ case ir_var_const_in:
+ return "function input";
+
+ case ir_var_function_out:
+ return "function output";
+
+ case ir_var_function_inout:
+ return "function inout";
+
+ case ir_var_system_value:
+ return "shader input";
+
+ case ir_var_temporary:
+ return "compiler temporary";
+
+ case ir_var_mode_count:
+ break;
+ }
+
+ assert(!"Should not get here.");
+ return "invalid variable";
+}