wined3d: Do not activate vertex shaders needlessly.

dlls/wined3d/state.c

@@ -2675,20 +2675,23 @@ static void vertexdeclaration(DWORD state, IWineD3DStateBlockImpl *stateblock) {
         IWineD3DVertexShader_CompileShader(stateblock->vertexShader);
     }
 
-    /* Vertex and pixel shaders are applied together for now, so let the last dirty state do the
-     * application
-     */
-    if(!isStateDirty(device, STATE_PIXELSHADER)) {
+    if(useVertexShaderFunction || device->last_was_vshader) {
         BOOL usePixelShaderFunction = device->ps_selected_mode != SHADER_NONE && 
                                       stateblock->pixelShader &&
                                       ((IWineD3DPixelShaderImpl *)stateblock->pixelShader)->baseShader.function;
 
+        /* Vertex and pixel shaders are applied together for now, so let the last dirty state do the
+         * application
+         */
+        if(!isStateDirty(device, STATE_PIXELSHADER)) {
             device->shader_backend->shader_select((IWineD3DDevice *) device, usePixelShaderFunction, useVertexShaderFunction);
 
             if(!isStateDirty(stateblock->wineD3DDevice, STATE_VERTEXSHADERCONSTANT) && (useVertexShaderFunction || usePixelShaderFunction)) {
                 shaderconstant(STATE_VERTEXSHADERCONSTANT, stateblock);
             }
         }
+        device->last_was_vshader = useVertexShaderFunction;
+    }
 
     if(updateFog) {
         state_fog(STATE_RENDER(WINED3DRS_FOGENABLE), stateblock);

dlls/wined3d/wined3d_private.h

@@ -583,6 +583,7 @@ typedef struct IWineD3DDeviceImpl
     BOOL                    last_was_notclipped;
     BOOL                    untransformed;
     BOOL                    last_was_pshader;
+    BOOL                    last_was_vshader;
     BOOL                    last_was_foggy_shader;
     BOOL                    namedArraysLoaded, numberedArraysLoaded;