That method is to be used to trace through assignments when computing
a constant expression.
Signed-off-by: Olivier Galibert <galib...@pobox.com>
---
src/glsl/ir.cpp | 31 +++++++++++++++++++++++++++++++
src/glsl/ir.h | 8 ++++++++
2 files changed, 39 insertions(+)
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index cfa806d..782d19a 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -857,6 +857,37 @@ ir_constant::get_record_field(const char *name)
return (ir_constant *) node;
}
+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
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index c211880..9db6c84 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -1681,6 +1681,14 @@ public:
ir_constant *get_record_field(const char *name);
+ /* Copy the values on another constant at a given offset and
+ * following an assign-like mask.
+ *
+ * The mask is ignored for scalars.
+ */
+
+ void copy_masked_offset(ir_constant *src, int offset, unsigned int mask);
+
/**
* Determine whether a constant has the same value as another constant
*
--
1.7.10.280.gaa39
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