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[DXBC] Multiplication signed zero handling

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Triang3l
2020-10-30 22:14:38 +03:00
parent adebaba799
commit feb8258a5e
3 changed files with 124 additions and 144 deletions
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26
src/xenia/gpu/shader.h
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@@ -212,14 +212,19 @@ struct InstructionOperand {
return false;
}
// Returns which components of two operands are identical, but may have
// different signs (for simplicity of usage with GetComponent, treating the
// rightmost component as replicated).
uint32_t GetAbsoluteIdenticalComponents(
// Returns which components of two operands are identical, so that
// multiplication of them would result in pow2 with + sign, including in case
// they're zero (because -0 * |-0|, or -0 * +0, is -0), for providing a fast
// path in emulation of the Shader Model 3 +-0 * x = +0 multiplication
// behavior (disregarding component_count for simplicity of usage with
// GetComponent, treating the rightmost component as replicated).
uint32_t GetIdenticalMultiplicandComponents(
const InstructionOperand& other) const {
if (storage_source != other.storage_source ||
storage_index != other.storage_index ||
storage_addressing_mode != other.storage_addressing_mode) {
storage_addressing_mode != other.storage_addressing_mode ||
is_absolute_value != other.is_absolute_value ||
(!is_absolute_value && is_negated != other.is_negated)) {
return 0;
}
uint32_t identical_components = 0;
@@ -229,15 +234,14 @@ struct InstructionOperand {
}
return identical_components;
}
// Returns which components of two operands will always be bitwise equal, but
// may have different signs (disregarding component_count for simplicity of
// usage with GetComponent, treating the rightmost component as replicated).
// Returns which components of two operands will always be bitwise equal
// (disregarding component_count for simplicity of usage with GetComponent,
// treating the rightmost component as replicated).
uint32_t GetIdenticalComponents(const InstructionOperand& other) const {
if (is_negated != other.is_negated ||
is_absolute_value != other.is_absolute_value) {
if (is_negated != other.is_negated) {
return 0;
}
return GetAbsoluteIdenticalComponents(other);
return GetIdenticalMultiplicandComponents(other);
}
};