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[Base] Support sign-extension in bitfield

This commit is contained in:
DrChat 2018-04-14 17:33:24 -05:00
parent d914791afe
commit f8319ec12f
2 changed files with 18 additions and 17 deletions
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24
src/xenia/base/bit_field.h
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@ -19,20 +19,28 @@ namespace xe {
// Bitfield, where position starts at the LSB.
template <typename T, size_t position, size_t n_bits>
struct bf {
bf() = default;
inline operator T() const { return value(); }
inline T value() const {
return static_cast<T>((storage & mask()) >> position);
}
// For enum values, we strip them down to an underlying type.
typedef
typename std::conditional<std::is_enum<T>::value, std::underlying_type<T>,
std::remove_reference<T>>::type::type
value_type;
bf() = default;
inline operator T() const { return value(); }
inline T value() const {
auto value = (storage & mask()) >> position;
if (std::is_signed<value_type>::value) {
// If the value is signed, sign-extend it.
value_type sign_mask = value_type(1) << (n_bits - 1);
value = (sign_mask ^ value) - sign_mask;
}
return static_cast<T>(value);
}
inline value_type mask() const {
return (((value_type)~0) >> (8 * sizeof(value_type) - n_bits)) << position;
return ((value_type(1) << n_bits) - 1) << position;
}
value_type storage;

11
src/xenia/gpu/vulkan/vulkan_command_processor.cc
View File

@ -912,15 +912,8 @@ bool VulkanCommandProcessor::IssueCopy() {
// vtx_window_offset_enable
assert_true(regs[XE_GPU_REG_PA_SU_SC_MODE_CNTL].u32 & 0x00010000);
uint32_t window_offset = regs[XE_GPU_REG_PA_SC_WINDOW_OFFSET].u32;
int16_t window_offset_x = window_offset & 0x7FFF;
int16_t window_offset_y = (window_offset >> 16) & 0x7FFF;
// Sign-extension
if (window_offset_x & 0x4000) {
window_offset_x |= 0x8000;
}
if (window_offset_y & 0x4000) {
window_offset_y |= 0x8000;
}
int32_t window_offset_x = window_regs->window_offset.window_x_offset;
int32_t window_offset_y = window_regs->window_offset.window_y_offset;
uint32_t dest_texel_size = uint32_t(GetTexelSize(copy_dest_format));