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-rw-r--r--src/glsl/ir_constant_expression.cpp671
1 files changed, 671 insertions, 0 deletions
diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
new file mode 100644
index 0000000000..3408f5256a
--- /dev/null
+++ b/src/glsl/ir_constant_expression.cpp
@@ -0,0 +1,671 @@
+/*
+ * 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.
+ */
+
+/**
+ * \file ir_constant_expression.cpp
+ * Evaluate and process constant valued expressions
+ *
+ * In GLSL, constant valued expressions are used in several places. These
+ * must be processed and evaluated very early in the compilation process.
+ *
+ * * Sizes of arrays
+ * * Initializers for uniforms
+ * * Initializers for \c const variables
+ */
+
+#include <math.h>
+#include "ir.h"
+#include "ir_visitor.h"
+#include "glsl_types.h"
+
+/**
+ * Visitor class for evaluating constant expressions
+ */
+class ir_constant_visitor : public ir_visitor {
+public:
+ ir_constant_visitor()
+ : value(NULL)
+ {
+ /* empty */
+ }
+
+ virtual ~ir_constant_visitor()
+ {
+ /* empty */
+ }
+
+ /**
+ * \name Visit methods
+ *
+ * As typical for the visitor pattern, there must be one \c visit method for
+ * each concrete subclass of \c ir_instruction. Virtual base classes within
+ * the hierarchy should not have \c visit methods.
+ */
+ /*@{*/
+ virtual void visit(ir_variable *);
+ virtual void visit(ir_function_signature *);
+ virtual void visit(ir_function *);
+ virtual void visit(ir_expression *);
+ virtual void visit(ir_texture *);
+ virtual void visit(ir_swizzle *);
+ virtual void visit(ir_dereference_variable *);
+ virtual void visit(ir_dereference_array *);
+ virtual void visit(ir_dereference_record *);
+ virtual void visit(ir_assignment *);
+ virtual void visit(ir_constant *);
+ virtual void visit(ir_call *);
+ virtual void visit(ir_return *);
+ virtual void visit(ir_if *);
+ virtual void visit(ir_loop *);
+ virtual void visit(ir_loop_jump *);
+ /*@}*/
+
+ /**
+ * Value of the constant expression.
+ *
+ * \note
+ * This field will be \c NULL if the expression is not constant valued.
+ */
+ /* FINIHSME: This cannot hold values for constant arrays or structures. */
+ ir_constant *value;
+};
+
+
+ir_constant *
+ir_instruction::constant_expression_value()
+{
+ ir_constant_visitor visitor;
+
+ this->accept(& visitor);
+ return visitor.value;
+}
+
+
+void
+ir_constant_visitor::visit(ir_variable *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_function_signature *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_function *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+void
+ir_constant_visitor::visit(ir_expression *ir)
+{
+ value = NULL;
+ ir_constant *op[2];
+ unsigned int operand, c;
+ ir_constant_data data;
+
+ for (operand = 0; operand < ir->get_num_operands(); operand++) {
+ op[operand] = ir->operands[operand]->constant_expression_value();
+ if (!op[operand])
+ return;
+ }
+
+ switch (ir->operation) {
+ case ir_unop_logic_not:
+ assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
+ for (c = 0; c < ir->operands[0]->type->components(); c++)
+ data.b[c] = !op[0]->value.b[c];
+ break;
+
+ case ir_unop_f2i:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.i[c] = op[0]->value.f[c];
+ }
+ break;
+ case ir_unop_i2f:
+ assert(op[0]->type->base_type == GLSL_TYPE_UINT ||
+ op[0]->type->base_type == GLSL_TYPE_INT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ if (op[0]->type->base_type == GLSL_TYPE_INT)
+ data.f[c] = op[0]->value.i[c];
+ else
+ data.f[c] = op[0]->value.u[c];
+ }
+ break;
+ case ir_unop_b2f:
+ assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.f[c] = op[0]->value.b[c] ? 1.0 : 0.0;
+ }
+ break;
+ case ir_unop_f2b:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.b[c] = bool(op[0]->value.f[c]);
+ }
+ break;
+ case ir_unop_b2i:
+ assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.u[c] = op[0]->value.b[c] ? 1 : 0;
+ }
+ break;
+ case ir_unop_i2b:
+ assert(op[0]->type->is_integer());
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.b[c] = bool(op[0]->value.u[c]);
+ }
+ break;
+
+ case ir_unop_neg:
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.u[c] = -op[0]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.i[c] = -op[0]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.f[c] = -op[0]->value.f[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ break;
+
+ case ir_unop_abs:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.u[c] = op[0]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.i[c] = op[0]->value.i[c];
+ if (data.i[c] < 0)
+ data.i[c] = -data.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.f[c] = fabs(op[0]->value.f[c]);
+ break;
+ default:
+ assert(0);
+ }
+ }
+ break;
+
+ case ir_unop_rcp:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->type->base_type) {
+ case GLSL_TYPE_UINT:
+ if (op[0]->value.u[c] != 0.0)
+ data.u[c] = 1 / op[0]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ if (op[0]->value.i[c] != 0.0)
+ data.i[c] = 1 / op[0]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ if (op[0]->value.f[c] != 0.0)
+ data.f[c] = 1.0 / op[0]->value.f[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ break;
+
+ case ir_unop_rsq:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.f[c] = 1.0 / sqrtf(op[0]->value.f[c]);
+ }
+ break;
+
+ case ir_unop_sqrt:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.f[c] = sqrtf(op[0]->value.f[c]);
+ }
+ break;
+
+ case ir_unop_exp:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.f[c] = expf(op[0]->value.f[c]);
+ }
+ break;
+
+ case ir_unop_log:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.f[c] = logf(op[0]->value.f[c]);
+ }
+ break;
+
+ case ir_unop_dFdx:
+ case ir_unop_dFdy:
+ assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ data.f[c] = 0.0;
+ }
+ break;
+
+ case ir_binop_add:
+ if (ir->operands[0]->type == ir->operands[1]->type) {
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.u[c] = op[0]->value.u[c] + op[1]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.i[c] = op[0]->value.i[c] + op[1]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.f[c] = op[0]->value.f[c] + op[1]->value.f[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ } else
+ /* FINISHME: Support operations with non-equal types. */
+ return;
+
+ break;
+ case ir_binop_sub:
+ if (ir->operands[0]->type == ir->operands[1]->type) {
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.u[c] = op[0]->value.u[c] - op[1]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.i[c] = op[0]->value.i[c] - op[1]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.f[c] = op[0]->value.f[c] - op[1]->value.f[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ } else
+ /* FINISHME: Support operations with non-equal types. */
+ return;
+
+ break;
+ case ir_binop_mul:
+ if (ir->operands[0]->type == ir->operands[1]->type &&
+ !ir->operands[0]->type->is_matrix()) {
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.u[c] = op[0]->value.u[c] * op[1]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.i[c] = op[0]->value.i[c] * op[1]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.f[c] = op[0]->value.f[c] * op[1]->value.f[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ } else
+ /* FINISHME: Support operations with non-equal types. */
+ return;
+
+ break;
+ case ir_binop_div:
+ if (ir->operands[0]->type == ir->operands[1]->type) {
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.u[c] = op[0]->value.u[c] / op[1]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.i[c] = op[0]->value.i[c] / op[1]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.f[c] = op[0]->value.f[c] / op[1]->value.f[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ } else
+ /* FINISHME: Support operations with non-equal types. */
+ return;
+
+ break;
+ case ir_binop_logic_and:
+ assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
+ for (c = 0; c < ir->operands[0]->type->components(); c++)
+ data.b[c] = op[0]->value.b[c] && op[1]->value.b[c];
+ break;
+ case ir_binop_logic_xor:
+ assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
+ for (c = 0; c < ir->operands[0]->type->components(); c++)
+ data.b[c] = op[0]->value.b[c] ^ op[1]->value.b[c];
+ break;
+ case ir_binop_logic_or:
+ assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
+ for (c = 0; c < ir->operands[0]->type->components(); c++)
+ data.b[c] = op[0]->value.b[c] || op[1]->value.b[c];
+ break;
+
+ case ir_binop_less:
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.b[0] = op[0]->value.u[0] < op[1]->value.u[0];
+ break;
+ case GLSL_TYPE_INT:
+ data.b[0] = op[0]->value.i[0] < op[1]->value.i[0];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.b[0] = op[0]->value.f[0] < op[1]->value.f[0];
+ break;
+ default:
+ assert(0);
+ }
+ break;
+ case ir_binop_greater:
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.b[0] = op[0]->value.u[0] > op[1]->value.u[0];
+ break;
+ case GLSL_TYPE_INT:
+ data.b[0] = op[0]->value.i[0] > op[1]->value.i[0];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.b[0] = op[0]->value.f[0] > op[1]->value.f[0];
+ break;
+ default:
+ assert(0);
+ }
+ break;
+ case ir_binop_lequal:
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.b[0] = op[0]->value.u[0] <= op[1]->value.u[0];
+ break;
+ case GLSL_TYPE_INT:
+ data.b[0] = op[0]->value.i[0] <= op[1]->value.i[0];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.b[0] = op[0]->value.f[0] <= op[1]->value.f[0];
+ break;
+ default:
+ assert(0);
+ }
+ break;
+ case ir_binop_gequal:
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.b[0] = op[0]->value.u[0] >= op[1]->value.u[0];
+ break;
+ case GLSL_TYPE_INT:
+ data.b[0] = op[0]->value.i[0] >= op[1]->value.i[0];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.b[0] = op[0]->value.f[0] >= op[1]->value.f[0];
+ break;
+ default:
+ assert(0);
+ }
+ break;
+
+ case ir_binop_equal:
+ data.b[0] = true;
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.b[0] = data.b[0] && op[0]->value.u[c] == op[1]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.b[0] = data.b[0] && op[0]->value.i[c] == op[1]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.b[0] = data.b[0] && op[0]->value.f[c] == op[1]->value.f[c];
+ break;
+ case GLSL_TYPE_BOOL:
+ data.b[0] = data.b[0] && op[0]->value.b[c] == op[1]->value.b[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ break;
+ case ir_binop_nequal:
+ data.b[0] = false;
+ for (c = 0; c < ir->operands[0]->type->components(); c++) {
+ switch (ir->operands[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.b[0] = data.b[0] || op[0]->value.u[c] != op[1]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.b[0] = data.b[0] || op[0]->value.i[c] != op[1]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.b[0] = data.b[0] || op[0]->value.f[c] != op[1]->value.f[c];
+ break;
+ case GLSL_TYPE_BOOL:
+ data.b[0] = data.b[0] || op[0]->value.b[c] != op[1]->value.b[c];
+ break;
+ default:
+ assert(0);
+ }
+ }
+ break;
+
+ default:
+ /* FINISHME: Should handle all expression types. */
+ return;
+ }
+
+ void *ctx = talloc_parent(ir);
+ this->value = new(ctx) ir_constant(ir->type, &data);
+}
+
+
+void
+ir_constant_visitor::visit(ir_texture *ir)
+{
+ // FINISHME: Do stuff with texture lookups
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_swizzle *ir)
+{
+ ir_constant *v = ir->val->constant_expression_value();
+
+ this->value = NULL;
+
+ if (v != NULL) {
+ ir_constant_data data;
+
+ const unsigned swiz_idx[4] = {
+ ir->mask.x, ir->mask.y, ir->mask.z, ir->mask.w
+ };
+
+ for (unsigned i = 0; i < ir->mask.num_components; i++) {
+ switch (v->type->base_type) {
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT: data.u[i] = v->value.u[swiz_idx[i]]; break;
+ case GLSL_TYPE_FLOAT: data.f[i] = v->value.f[swiz_idx[i]]; break;
+ case GLSL_TYPE_BOOL: data.b[i] = v->value.b[swiz_idx[i]]; break;
+ default: assert(!"Should not get here."); break;
+ }
+ }
+
+ void *ctx = talloc_parent(ir);
+ this->value = new(ctx) ir_constant(ir->type, &data);
+ }
+}
+
+
+void
+ir_constant_visitor::visit(ir_dereference_variable *ir)
+{
+ value = NULL;
+
+ ir_variable *var = ir->variable_referenced();
+ if (var && var->constant_value)
+ value = (ir_constant *)var->constant_value->clone(NULL);
+}
+
+
+void
+ir_constant_visitor::visit(ir_dereference_array *ir)
+{
+ void *ctx = talloc_parent(ir);
+ ir_constant *array = ir->array->constant_expression_value();
+ ir_constant *idx = ir->array_index->constant_expression_value();
+
+ this->value = NULL;
+
+ if ((array != NULL) && (idx != NULL)) {
+ if (array->type->is_matrix()) {
+ /* Array access of a matrix results in a vector.
+ */
+ const unsigned column = idx->value.u[0];
+
+ const glsl_type *const column_type = array->type->column_type();
+
+ /* Offset in the constant matrix to the first element of the column
+ * to be extracted.
+ */
+ const unsigned mat_idx = column * column_type->vector_elements;
+
+ ir_constant_data data;
+
+ switch (column_type->base_type) {
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ for (unsigned i = 0; i < column_type->vector_elements; i++)
+ data.u[i] = array->value.u[mat_idx + i];
+
+ break;
+
+ case GLSL_TYPE_FLOAT:
+ for (unsigned i = 0; i < column_type->vector_elements; i++)
+ data.f[i] = array->value.f[mat_idx + i];
+
+ break;
+
+ default:
+ assert(!"Should not get here.");
+ break;
+ }
+
+ this->value = new(ctx) ir_constant(column_type, &data);
+ } else if (array->type->is_vector()) {
+ const unsigned component = idx->value.u[0];
+
+ this->value = new(ctx) ir_constant(array, component);
+ } else {
+ /* FINISHME: Handle access of constant arrays. */
+ }
+ }
+}
+
+
+void
+ir_constant_visitor::visit(ir_dereference_record *ir)
+{
+ ir_constant *v = ir->record->constant_expression_value();
+
+ this->value = (v != NULL) ? v->get_record_field(ir->field) : NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_assignment *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_constant *ir)
+{
+ value = ir;
+}
+
+
+void
+ir_constant_visitor::visit(ir_call *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_return *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_if *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_loop *ir)
+{
+ (void) ir;
+ value = NULL;
+}
+
+
+void
+ir_constant_visitor::visit(ir_loop_jump *ir)
+{
+ (void) ir;
+ value = NULL;
+}
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