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[c-host] dxgi: reworked for better pipelining

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This commit is contained in:
Geoffrey McRae 2019-03-04 16:56:45 +11:00
parent 935eb0651d
commit 8120913acb
4 changed files with 140 additions and 74 deletions
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4
c-host/app.c
View File

@ -97,11 +97,7 @@ static int frameThread(void * opaque)
// wait for the client to finish with the previous frame
while(fi->flags & KVMFR_FRAME_FLAG_UPDATE && app.running)
{
DEBUG_WARN("Waiting for the client");
// this generally never happens
usleep(1000);
}
switch(frame.format)
{

4
c-host/app.h
View File

@ -40,10 +40,12 @@ bool os_joinThread (osThreadHandle * handle, int * resultCode);
// os specific event functions
#define TIMEOUT_INFINITE ((unsigned int)~0)
typedef struct osEventHandle osEventHandle;
osEventHandle * os_createEvent(bool autoReset);
void os_freeEvent (osEventHandle * handle);
bool os_waitEvent (osEventHandle * handle);
bool os_waitEvent (osEventHandle * handle, unsigned int timeout);
bool os_signalEvent(osEventHandle * handle);
bool os_resetEvent (osEventHandle * handle);

194
c-host/windows/capture/dxgi.c
View File

@ -29,10 +29,21 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include "dxgi_extra.h"
#define MAX_TEXTURES 2
typedef struct Texture
{
ID3D11Texture2D * tex;
D3D11_MAPPED_SUBRESOURCE map;
osEventHandle * evt;
}
Texture;
// locals
struct iface
{
bool initialized;
bool reinit;
IDXGIFactory1 * factory;
IDXGIAdapter1 * adapter;
IDXGIOutput * output;
@ -40,10 +51,10 @@ struct iface
ID3D11DeviceContext * deviceContext;
D3D_FEATURE_LEVEL featureLevel;
IDXGIOutputDuplication * dup;
ID3D11Texture2D * texture;
D3D11_MAPPED_SUBRESOURCE mapping;
Texture texture[MAX_TEXTURES];
int texRIndex;
int texWIndex;
bool needsRelease;
osEventHandle * copyEvent;
osEventHandle * frameEvent;
osEventHandle * pointerEvent;
@ -79,19 +90,10 @@ static bool dxgi_create()
return false;
}
this->copyEvent = os_createEvent(true);
if (!this->copyEvent)
{
DEBUG_ERROR("failed to create the copy event");
free(this);
return false;
}
this->frameEvent = os_createEvent(true);
if (!this->frameEvent)
{
DEBUG_ERROR("failed to create the frame event");
os_freeEvent(this->copyEvent);
free(this);
return false;
}
@ -100,7 +102,6 @@ static bool dxgi_create()
if (!this->pointerEvent)
{
DEBUG_ERROR("failed to create the pointer event");
os_freeEvent(this->copyEvent );
os_freeEvent(this->frameEvent);
free(this);
return false;
@ -129,12 +130,14 @@ static bool dxgi_init()
dpiDone = true;
}
// pre-signal the copy event
os_signalEvent(this->copyEvent);
HRESULT status;
DXGI_OUTPUT_DESC outputDesc;
this->reinit = false;
this->texRIndex = 0;
this->texWIndex = 0;
os_resetEvent(this->frameEvent);
status = CreateDXGIFactory1(&IID_IDXGIFactory1, (void **)&this->factory);
if (FAILED(status))
{
@ -334,16 +337,29 @@ static bool dxgi_init()
texDesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
texDesc.MiscFlags = 0;
status = ID3D11Device_CreateTexture2D(this->device, &texDesc, NULL, &this->texture);
if (FAILED(status))
for(int i = 0; i < MAX_TEXTURES; ++i)
{
DEBUG_WINERROR("Failed to create texture", status);
goto fail;
status = ID3D11Device_CreateTexture2D(this->device, &texDesc, NULL, &this->texture[i].tex);
if (FAILED(status))
{
DEBUG_WINERROR("Failed to create texture", status);
goto fail;
}
this->texture[i].evt = os_createEvent(true);
if (!this->texture[i].evt)
{
DEBUG_ERROR("Failed to create the texture event");
goto fail;
}
// pre-signal the events to flag as unused
os_signalEvent(this->texture[i].evt);
}
// map the texture simply to get the pitch and stride
D3D11_MAPPED_SUBRESOURCE mapping;
status = ID3D11DeviceContext_Map(this->deviceContext, (ID3D11Resource *)this->texture, 0, D3D11_MAP_READ, 0, &mapping);
status = ID3D11DeviceContext_Map(this->deviceContext, (ID3D11Resource *)this->texture[0].tex, 0, D3D11_MAP_READ, 0, &mapping);
if (FAILED(status))
{
DEBUG_WINERROR("Failed to map the texture", status);
@ -351,7 +367,7 @@ static bool dxgi_init()
}
this->pitch = mapping.RowPitch;
this->stride = mapping.RowPitch / 4;
ID3D11DeviceContext_Unmap(this->deviceContext, (ID3D11Resource *)this->texture, 0);
ID3D11DeviceContext_Unmap(this->deviceContext, (ID3D11Resource *)this->texture[0].tex, 0);
this->initialized = true;
return true;
@ -365,16 +381,26 @@ static bool dxgi_deinit()
{
assert(this);
if (this->mapping.pData)
for(int i = 0; i < MAX_TEXTURES; ++i)
{
ID3D11DeviceContext_Unmap(this->deviceContext, (ID3D11Resource*)this->texture, 0);
this->mapping.pData = NULL;
}
if (this->texture[i].map.pData)
{
ID3D11DeviceContext_Unmap(this->deviceContext, (ID3D11Resource*)this->texture[i].tex, 0);
this->texture[i].map.pData = NULL;
}
if (this->texture)
{
ID3D11Texture2D_Release(this->texture);
this->texture = NULL;
if (this->texture[i].tex)
{
ID3D11Texture2D_Release(this->texture[i].tex);
this->texture[i].tex = NULL;
}
if (this->texture[i].evt)
{
os_signalEvent(this->texture[i].evt);
os_freeEvent(this->texture[i].evt);
this->texture[i].evt = NULL;
}
}
if (this->dup)
@ -431,7 +457,6 @@ static void dxgi_free()
if (this->initialized)
dxgi_deinit();
os_freeEvent(this->copyEvent );
os_freeEvent(this->frameEvent );
os_freeEvent(this->pointerEvent);
@ -447,7 +472,7 @@ static unsigned int dxgi_getMaxFrameSize()
return this->height * this->pitch;
}
static CaptureResult dxgi_capture(bool * hasFrameUpdate, bool * hasPointerUpdate)
inline static CaptureResult dxgi_capture_int(bool * hasFrameUpdate, bool * hasPointerUpdate)
{
assert(this);
assert(this->initialized);
@ -482,41 +507,54 @@ static CaptureResult dxgi_capture(bool * hasFrameUpdate, bool * hasPointerUpdate
if (frameInfo.LastPresentTime.QuadPart != 0)
{
ID3D11Texture2D * src;
status = IDXGIResource_QueryInterface(res, &IID_ID3D11Texture2D, (void **)&src);
if (FAILED(status))
Texture * tex = &this->texture[this->texWIndex];
// check if the texture is free, if not skip the frame to keep up
if (!os_waitEvent(tex->evt, 0))
{
DEBUG_WINERROR("Failed to get the texture from the dxgi resource", status);
IDXGIResource_Release(res);
return CAPTURE_RESULT_ERROR;
DEBUG_WARN("Frame skipped");
}
// wait for the prior copy to finish in getFrame and unmap
os_waitEvent(this->copyEvent);
if (this->mapping.pData)
else
{
ID3D11DeviceContext_Unmap(this->deviceContext, (ID3D11Resource*)this->texture, 0);
this->mapping.pData = NULL;
ID3D11Texture2D * src;
status = IDXGIResource_QueryInterface(res, &IID_ID3D11Texture2D, (void **)&src);
if (FAILED(status))
{
DEBUG_WINERROR("Failed to get the texture from the dxgi resource", status);
IDXGIResource_Release(res);
return CAPTURE_RESULT_ERROR;
}
// if the texture was mapped, unmap it
if (tex->map.pData)
{
ID3D11DeviceContext_Unmap(this->deviceContext, (ID3D11Resource*)tex->tex, 0);
tex->map.pData = NULL;
}
// issue the copy from GPU to CPU RAM
ID3D11DeviceContext_CopyResource(this->deviceContext,
(ID3D11Resource *)tex->tex, (ID3D11Resource *)src);
// map the resource (this must be done here as ID3D11DeviceContext is not thread safe)
status = ID3D11DeviceContext_Map(this->deviceContext, (ID3D11Resource*)tex->tex, 0, D3D11_MAP_READ, 0, &tex->map);
if (FAILED(status))
{
DEBUG_WINERROR("Failed to map the texture", status);
IDXGIResource_Release(res);
return CAPTURE_RESULT_ERROR;
}
// signal that a frame is available
os_signalEvent(this->frameEvent);
// advance our write pointer
if (++this->texWIndex == MAX_TEXTURES)
this->texWIndex = 0;
ID3D11Texture2D_Release(src);
*hasFrameUpdate = true;
}
// issue the copy from GPU to CPU RAM
ID3D11DeviceContext_CopyResource(this->deviceContext,
(ID3D11Resource *)this->texture, (ID3D11Resource *)src);
// map the resource (this must be done here as ID3D11DeviceContext is not thread safe)
status = ID3D11DeviceContext_Map(this->deviceContext, (ID3D11Resource*)this->texture, 0, D3D11_MAP_READ, 0, &this->mapping);
if (FAILED(status))
{
DEBUG_WINERROR("Failed to map the texture", status);
IDXGIResource_Release(res);
return CAPTURE_RESULT_ERROR;
}
// signal that a frame is available
os_signalEvent(this->frameEvent);
ID3D11Texture2D_Release(src);
*hasFrameUpdate = true;
}
if (frameInfo.PointerShapeBufferSize > 0)
@ -529,27 +567,51 @@ static CaptureResult dxgi_capture(bool * hasFrameUpdate, bool * hasPointerUpdate
return CAPTURE_RESULT_OK;
}
static CaptureResult dxgi_capture(bool * hasFrameUpdate, bool * hasPointerUpdate)
{
CaptureResult result = dxgi_capture_int(hasFrameUpdate, hasPointerUpdate);
// signal pending events if the result was any form of failure or reinit
if (result != CAPTURE_RESULT_OK && result != CAPTURE_RESULT_TIMEOUT)
{
this->reinit = true;
os_signalEvent(this->frameEvent);
}
return result;
}
static bool dxgi_getFrame(CaptureFrame * frame)
{
assert(this);
assert(this->initialized);
if (!os_waitEvent(this->frameEvent))
if (this->reinit)
return true;
if (!os_waitEvent(this->frameEvent, TIMEOUT_INFINITE))
{
DEBUG_ERROR("Failed to wait on the frame event");
return false;
}
if (this->reinit)
return true;
Texture * tex = &this->texture[this->texRIndex];
frame->width = this->width;
frame->height = this->height;
frame->pitch = this->pitch;
frame->stride = this->stride;
frame->format = this->format;
memcpy(frame->data, tex->map.pData, this->pitch * this->height);
os_signalEvent(tex->evt);
memcpy(frame->data, this->mapping.pData, this->pitch * this->height);
if (++this->texRIndex == MAX_TEXTURES)
this->texRIndex = 0;
os_signalEvent(this->copyEvent);
return true;
}

12
c-host/windows/platform.c
View File

@ -317,19 +317,25 @@ void os_freeEvent(osEventHandle * handle)
CloseHandle((HANDLE)handle);
}
bool os_waitEvent(osEventHandle * handle)
bool os_waitEvent(osEventHandle * handle, unsigned int timeout)
{
const DWORD to = (timeout == TIMEOUT_INFINITE) ? INFINITE : (DWORD)timeout;
while(true)
{
switch(WaitForSingleObject((HANDLE)handle, INFINITE))
switch(WaitForSingleObject((HANDLE)handle, to))
{
case WAIT_OBJECT_0:
return true;
case WAIT_ABANDONED:
case WAIT_TIMEOUT:
continue;
case WAIT_TIMEOUT:
if (timeout == TIMEOUT_INFINITE)
continue;
return false;
case WAIT_FAILED:
DEBUG_WINERROR("Wait for event failed", GetLastError());
return false;