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of tiles.\nInstead, this extension lets developers query performance counter\ninformation per region of a render pass instance.",{"type":1873,"tag":1880,"props":1902,"children":1904},{"id":1903},"_solution_space",[1905],{"type":1878,"value":1906},"Solution Space",{"type":1873,"tag":1874,"props":1908,"children":1909},{},[1910],{"type":1878,"value":1911},"The main design decision is whether to add an API support for this or\nif other mechanisms are sufficient.\nWe are proposing an API mechanism in order to have a platform agnostic\nsolution that allows for application-level control.",{"type":1873,"tag":1874,"props":1913,"children":1914},{},[1915],{"type":1878,"value":1916},"For the API design, the main constraint is that we want to capture\ninformation per region of a render pass instance, and the number of\nregions is thus dependent on the render area.",{"type":1873,"tag":1874,"props":1918,"children":1919},{},[1920,1922,1929,1931,1937,1939],{"type":1878,"value":1921},"We considered using the standard Vulkan query and query pool mechanism\nfor this extension, but decided not to for multiple reasons.\nFirst, the amount of memory required from the query pool would be\nvariable based on the size of the render area.\nSecond, the query would have to be active for the duration of the\nrender pass instance, and we would have to add rules to\n",{"type":1873,"tag":1923,"props":1924,"children":1926},"code",{"className":1925},[],[1927],{"type":1878,"value":1928},"vkCmdBeginQuery",{"type":1878,"value":1930}," and ",{"type":1873,"tag":1923,"props":1932,"children":1934},{"className":1933},[],[1935],{"type":1878,"value":1936},"vkCmdEndQuery",{"type":1878,"value":1938}," to enforce this.\nFinally, the typical consumer of the performance information will\nbe tools, and we for that use case we would need to copy the\nresults to application-visible memory 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