diff options
| -rw-r--r-- | src/glsl/ir.cpp | 41 | ||||
| -rw-r--r-- | src/glsl/ir.h | 20 |
2 files changed, 58 insertions, 3 deletions
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp index 714826343c7..308b7c2010d 100644 --- a/src/glsl/ir.cpp +++ b/src/glsl/ir.cpp @@ -41,6 +41,11 @@ bool ir_rvalue::is_one() const return false; } +bool ir_rvalue::is_negative_one() const +{ + return false; +} + /** * Modify the swizzle make to move one component to another * @@ -764,6 +769,42 @@ ir_constant::is_one() const return true; } +bool +ir_constant::is_negative_one() const +{ + if (!this->type->is_scalar() && !this->type->is_vector()) + return false; + + if (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] != -1.0) + return false; + break; + case GLSL_TYPE_INT: + if (this->value.i[c] != -1) + return false; + break; + case GLSL_TYPE_UINT: + if (int(this->value.u[c]) != -1) + 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 true; +} + ir_loop::ir_loop() { this->ir_type = ir_type_loop; diff --git a/src/glsl/ir.h b/src/glsl/ir.h index 2b94e63cc2c..960cd8bab43 100644 --- a/src/glsl/ir.h +++ b/src/glsl/ir.h @@ -179,7 +179,7 @@ public: * for vector and scalar types that have all elements set to the value * zero (or \c false for booleans). * - * \sa ir_constant::has_value, ir_rvalue::is_one + * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one */ virtual bool is_zero() const; @@ -191,10 +191,22 @@ public: * for vector and scalar types that have all elements set to the value * one (or \c true for booleans). * - * \sa ir_constant::has_value, ir_rvalue::is_zero + * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one */ virtual bool is_one() const; + /** + * Determine if an r-value has the value negative one + * + * The base implementation of this function always returns \c false. The + * \c ir_constant class over-rides this function to return \c true \b only + * for vector and scalar types that have all elements set to the value + * negative one. For boolean times, the result is always \c false. + * + * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one + */ + virtual bool is_negative_one() const; + protected: ir_rvalue(); }; @@ -1482,12 +1494,14 @@ public: /** * Determine whether a constant has the same value as another constant * - * \sa ir_constant::is_zero, ir_constant::is_one + * \sa ir_constant::is_zero, ir_constant::is_one, + * ir_constant::is_negative_one */ bool has_value(const ir_constant *) const; virtual bool is_zero() const; virtual bool is_one() const; + virtual bool is_negative_one() const; /** * Value of the constant. |