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[GPU] Update vizquery documentation

This commit is contained in:
Dr. Chat 2018-02-16 22:03:33 -06:00
parent 766974c30a
commit 3d1c2a6c9a
1 changed files with 23 additions and 5 deletions
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28
src/xenia/gpu/command_processor.cc
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@ -10,6 +10,7 @@
#include "xenia/gpu/command_processor.h"
#include <algorithm>
#include <cinttypes>
#include <cmath>
#include "xenia/base/byte_stream.h"
@ -19,6 +20,7 @@
#include "xenia/base/ring_buffer.h"
#include "xenia/gpu/gpu_flags.h"
#include "xenia/gpu/graphics_system.h"
#include "xenia/gpu/registers.h"
#include "xenia/gpu/sampler_info.h"
#include "xenia/gpu/texture_info.h"
#include "xenia/gpu/xenos.h"
@ -166,6 +168,9 @@ void CommandProcessor::WorkerThreadMain() {
xe::store_and_swap<uint32_t>(
memory_->TranslatePhysical(read_ptr_writeback_ptr_), read_ptr_index_);
}
// FIXME: We're supposed to process the WAIT_UNTIL register at this point,
// but no games seem to actually use it.
}
ShutdownContext();
@ -1028,7 +1033,11 @@ bool CommandProcessor::ExecutePacketType3_EVENT_WRITE_EXT(RingBuffer* reader,
WriteRegister(XE_GPU_REG_VGT_EVENT_INITIATOR, initiator & 0x3F);
auto endianness = static_cast<Endian>(address & 0x3);
address &= ~0x3;
// Let us hope we can fake this.
// This callback tells the driver the xy coordinates affected by a previous
// drawcall.
// https://www.google.com/patents/US20060055701
uint16_t extents[] = {
0 >> 3, // min x
2560 >> 3, // max x
@ -1065,6 +1074,8 @@ bool CommandProcessor::ExecutePacketType3_DRAW_INDX(RingBuffer* reader,
// initiate fetch of index buffer and draw
// if dword0 != 0, this is a conditional draw based on viz query.
// This ID matches the one issued in PM4_VIZ_QUERY
// ID = dword0 & 0x3F;
// use = dword0 & 0x40;
uint32_t dword0 = reader->Read<uint32_t>(true); // viz query info
uint32_t dword1 = reader->Read<uint32_t>(true);
uint32_t index_count = dword1 >> 16;
@ -1313,13 +1324,20 @@ bool CommandProcessor::ExecutePacketType3_VIZ_QUERY(RingBuffer* reader,
// http://www.google.com/patents/US20050195186
assert_true(count == 1);
// Some sort of ID?
// This appears to reset a viz query context.
// This ID matches the ID in conditional draw commands.
// Patent says the driver sets the viz_query register with info about the
// context ID.
uint32_t dword0 = reader->Read<uint32_t>(true);
uint32_t id = dword0 & 0x3F;
uint32_t end = dword0 & 0x80;
if (!end) {
// begin a new viz query @ id
WriteRegister(XE_GPU_REG_VGT_EVENT_INITIATOR, VIZQUERY_START);
XELOGGPU("Begin viz query ID %.2X", id);
} else {
// end the viz query
WriteRegister(XE_GPU_REG_VGT_EVENT_INITIATOR, VIZQUERY_END);
XELOGGPU("End viz query ID %.2X", id);
}
return true;
}