[dxgi] cache the input shader resource view of the src texture

host/platform/Windows/capture/DXGI/src/dxgi.c

@@ -54,8 +54,10 @@ extern const DXGIPostProcess DXGIPP_SDRWhiteLevel;
 
 typedef struct
 {
-  const DXGIPostProcess * pp;
-  void                  * opaque;
+  ID3D11Texture2D          * src;
+  ID3D11ShaderResourceView * srv;
+  const DXGIPostProcess    * pp;
+  void                     * opaque;
 }
 PostProcessInstance;
 
@@ -1336,7 +1338,42 @@ static ID3D11Texture2D * ppRun(Texture * tex, ID3D11Texture2D * src)
 {
   PostProcessInstance * inst;
   vector_forEachRef(inst, &tex->pp)
-    src = inst->pp->run(inst->opaque, src);
+  {
+    // if the srv exists and the src has changed, release it
+    if (inst->src != src && inst->srv)
+    {
+      ID3D11ShaderResourceView_Release(inst->srv);
+      inst->srv = NULL;
+    }
+
+    // if the srv is not set, create one
+    if (!inst->srv)
+    {
+      D3D11_TEXTURE2D_DESC desc;
+      ID3D11Texture2D_GetDesc(src, &desc);
+
+      const D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc =
+      {
+        .Format              = desc.Format,
+        .ViewDimension       = D3D11_SRV_DIMENSION_TEXTURE2D,
+        .Texture2D.MipLevels = 1
+      };
+
+      HRESULT status = ID3D11Device_CreateShaderResourceView(
+        *this->device, (ID3D11Resource *)src, &srvDesc, &inst->srv);
+
+      if (FAILED(status))
+      {
+        DEBUG_WINERROR("Failed to create the source resource view", status);
+        continue;
+      }
+
+      inst->src = src;
+    }
+
+    // run the post processor
+    src = inst->pp->run(inst->opaque, inst->srv);
+  }
 
   return src;
 }
@@ -1352,6 +1389,9 @@ static void ppFreeAll(void)
     PostProcessInstance * inst;
     vector_forEachRef(inst, &tex->pp)
     {
+      if(inst->srv)
+        ID3D11ShaderResourceView_Release(inst->srv);
+
       inst->pp->free(inst->opaque);
       if (i == this->maxTextures - 1)
         inst->pp->finish();

host/platform/Windows/capture/DXGI/src/pp.h

@@ -43,7 +43,7 @@ typedef struct
     bool    shareable);
 
   /* perform the processing */
-  ID3D11Texture2D * (*run)(void * opaque, ID3D11Texture2D * src);
+  ID3D11Texture2D * (*run)(void * opaque, ID3D11ShaderResourceView * srv);
 
   /* instance destruction */
   void (*free)(void * opaque);

host/platform/Windows/capture/DXGI/src/pp/sdrwhitelevel.c

@@ -313,40 +313,19 @@ static void updateConsts(void)
     0, NULL, &consts, 0, 0);
 }
 
-static ID3D11Texture2D * sdrWhiteLevel_run(void * opaque, ID3D11Texture2D * src)
+static ID3D11Texture2D * sdrWhiteLevel_run(void * opaque,
+  ID3D11ShaderResourceView * srv)
 {
-  comRef_scopePush();
-  ID3D11Texture2D * result = NULL;
   SDRWhiteLevelInst * inst = (SDRWhiteLevelInst *)opaque;
-  HRESULT status;
 
   updateConsts();
 
-  // setup the pixel shader input resource view
-  comRef_defineLocal(ID3D11ShaderResourceView, inputSRV);
-  D3D11_TEXTURE2D_DESC desc;
-  ID3D11Texture2D_GetDesc(src, &desc);
-
-  const D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc =
-  {
-    .Format              = desc.Format,
-    .ViewDimension       = D3D11_SRV_DIMENSION_TEXTURE2D,
-    .Texture2D.MipLevels = 1
-  };
-  status = ID3D11Device_CreateShaderResourceView(
-    *this.device, (ID3D11Resource *)src, &srvDesc, inputSRV);
-  if (FAILED(status))
-  {
-    DEBUG_WINERROR("Failed to create the source resource view", status);
-    goto exit;
-  }
-
   // set the vertex and pixel shader
   ID3D11DeviceContext_VSSetShader(*this.context, *this.vshader, NULL, 0);
   ID3D11DeviceContext_PSSetShader(*this.context, *this.pshader, NULL, 0);
 
   // set the pixel shader resources
-  ID3D11DeviceContext_PSSetShaderResources(*this.context, 0, 1, inputSRV    );
+  ID3D11DeviceContext_PSSetShaderResources(*this.context, 0, 1, &srv        );
   ID3D11DeviceContext_PSSetSamplers       (*this.context, 0, 1, this.sampler);
   ID3D11DeviceContext_PSSetConstantBuffers(*this.context, 0, 1, this.buffer );
 
@@ -358,11 +337,7 @@ static ID3D11Texture2D * sdrWhiteLevel_run(void * opaque, ID3D11Texture2D * src)
 
   ID3D11DeviceContext_Draw(*this.context, 4, 0);
 
-  result = *inst->tex;
-
-exit:
-  comRef_scopePop();
-  return result;
+  return *inst->tex;
 }
 
 DXGIPostProcess DXGIPP_SDRWhiteLevel =