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[host] dxgi: use CopySubresourceRegion when possible
This commit adds damage tracking to the DXGI textures, and only copies the damaged areas to the textures with ID3D11DeviceContext::CopySubresourceRegion. The sleep logic in waitFrame makes it difficult for this to reduce the latency, but removing it shows significant improvements (6-7 ms to ~3 ms) when a tiny portion of the screen is damaged, while showing no difference on full screen damage.
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@ -40,7 +40,7 @@
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#include "dxgi_extra.h"
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#define LOCKED(x) INTERLOCKED_SECTION(this->deviceContextLock, x)
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#define LOCKED(...) INTERLOCKED_SECTION(this->deviceContextLock, __VA_ARGS__)
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enum TextureState
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{
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@ -56,8 +56,10 @@ typedef struct Texture
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ID3D11Texture2D * tex;
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D3D11_MAPPED_SUBRESOURCE map;
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uint64_t copyTime;
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uint8_t damageRectsCount;
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uint32_t damageRectsCount;
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FrameDamageRect damageRects[KVMFR_MAX_DAMAGE_RECTS];
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int32_t texDamageCount;
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FrameDamageRect texDamageRects[KVMFR_MAX_DAMAGE_RECTS];
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}
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Texture;
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@ -556,6 +558,7 @@ static bool dxgi_init(void)
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for (int i = 0; i < this->maxTextures; ++i)
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{
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this->texture[i].texDamageCount = -1;
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status = ID3D11Device_CreateTexture2D(this->device, &texDesc, NULL, &this->texture[i].tex);
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if (FAILED(status))
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{
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@ -859,10 +862,36 @@ static CaptureResult dxgi_capture(void)
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{
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computeFrameDamage(tex);
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if (tex->texDamageCount < 0 || tex->damageRectsCount == 0 ||
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tex->texDamageCount + tex->damageRectsCount > KVMFR_MAX_DAMAGE_RECTS)
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tex->texDamageCount = -1;
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else
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{
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memcpy(tex->texDamageRects + tex->texDamageCount, tex->damageRects,
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tex->damageRectsCount * sizeof(FrameDamageRect));
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tex->texDamageCount += tex->damageRectsCount;
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tex->texDamageCount = rectsMergeOverlapping(tex->texDamageRects, tex->texDamageCount);
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}
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// issue the copy from GPU to CPU RAM
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tex->copyTime = microtime();
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ID3D11DeviceContext_CopyResource(this->deviceContext,
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(ID3D11Resource *)tex->tex, (ID3D11Resource *)src);
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if (tex->texDamageCount < 0)
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ID3D11DeviceContext_CopyResource(this->deviceContext,
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(ID3D11Resource *)tex->tex, (ID3D11Resource *)src);
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else
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{
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for (int i = 0; i < tex->texDamageCount; ++i)
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{
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FrameDamageRect * rect = tex->texDamageRects + i;
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D3D11_BOX box = {
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.left = rect->x, .top = rect->y, .front = 0, .back = 1,
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.right = rect->x + rect->width, .bottom = rect->y + rect->height,
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};
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ID3D11DeviceContext_CopySubresourceRegion(this->deviceContext,
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(ID3D11Resource *)tex->tex, 0, rect->x, rect->y, 0,
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(ID3D11Resource *)src, 0, &box);
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}
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}
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}
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if (copyPointer)
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@ -879,6 +908,22 @@ static CaptureResult dxgi_capture(void)
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{
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ID3D11Texture2D_Release(src);
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for (int i = 0; i < this->maxTextures; ++i)
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{
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Texture * t = this->texture + i;
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if (i == this->texWIndex)
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t->texDamageCount = 0;
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else if (tex->damageRectsCount > 0 && t->texDamageCount >= 0 &&
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t->texDamageCount + tex->damageRectsCount <= KVMFR_MAX_DAMAGE_RECTS)
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{
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memcpy(t->texDamageRects + t->texDamageCount, tex->damageRects,
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tex->damageRectsCount * sizeof(FrameDamageRect));
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t->texDamageCount += tex->damageRectsCount;
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}
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else
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t->texDamageCount = -1;
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}
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// set the state, and signal
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tex->state = TEXTURE_STATE_PENDING_MAP;
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tex->formatVer = this->formatVer;
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