diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/vulkan/rendering_device_vulkan.cpp | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/vulkan/rendering_device_vulkan.cpp b/drivers/vulkan/rendering_device_vulkan.cpp index 09f10ef8b1..96d6f99f6f 100644 --- a/drivers/vulkan/rendering_device_vulkan.cpp +++ b/drivers/vulkan/rendering_device_vulkan.cpp @@ -6935,9 +6935,42 @@ uint64_t RenderingDeviceVulkan::get_captured_timestamps_frame() const { return frames[frame].index; } +static void mult64to128(uint64_t u, uint64_t v, uint64_t &h, uint64_t &l) { + uint64_t u1 = (u & 0xffffffff); + uint64_t v1 = (v & 0xffffffff); + uint64_t t = (u1 * v1); + uint64_t w3 = (t & 0xffffffff); + uint64_t k = (t >> 32); + + u >>= 32; + t = (u * v1) + k; + k = (t & 0xffffffff); + uint64_t w1 = (t >> 32); + + v >>= 32; + t = (u1 * v) + k; + k = (t >> 32); + + h = (u * v) + w1 + k; + l = (t << 32) + w3; +} + uint64_t RenderingDeviceVulkan::get_captured_timestamp_gpu_time(uint32_t p_index) const { ERR_FAIL_UNSIGNED_INDEX_V(p_index, frames[frame].timestamp_result_count, 0); - return frames[frame].timestamp_result_values[p_index] * limits.timestampPeriod; + + // this sucks because timestampPeriod multiplier is a float, while the timestamp is 64 bits nanosecs. + // so, in cases like nvidia which give you enormous numbers and 1 as multiplier, multiplying is next to impossible + // need to do 128 bits fixed point multiplication to get the rigth value + + uint64_t shift_bits = 16; + + uint64_t h, l; + + mult64to128(frames[frame].timestamp_result_values[p_index], uint64_t(double(limits.timestampPeriod) * double(1 << shift_bits)), h, l); + l >>= shift_bits; + l |= h << (64 - shift_bits); + + return l; } uint64_t RenderingDeviceVulkan::get_captured_timestamp_cpu_time(uint32_t p_index) const { ERR_FAIL_UNSIGNED_INDEX_V(p_index, frames[frame].timestamp_result_count, 0); |