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Backends: Vulkan: comments about user using VK_DYNAMIC_STATE_VIEWPORT / VK_DYNAMIC_STATE_SCISSOR and not calling vkCmdSetViewport() / vkCmdSetScissor(). (#4644)

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ocornut 2021-10-15 12:01:35 +02:00
parent e3bd9434b1
commit bbd5119a26
1 changed files with 8 additions and 0 deletions
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8
backends/imgui_impl_vulkan.cpp
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@ -537,6 +537,14 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
global_idx_offset += cmd_list->IdxBuffer.Size;
global_vtx_offset += cmd_list->VtxBuffer.Size;
}
// Note: at this point both vkCmdSetViewport() and vkCmdSetScissor() have been called.
// Our last values will leak into user/application rendering IF:
// - Your app uses a pipeline with VK_DYNAMIC_STATE_VIEWPORT or VK_DYNAMIC_STATE_SCISSOR dynamic state
// - And you forgot to call vkCmdSetViewport() and vkCmdSetScissor() yourself to explicitely set that state.
// If you use VK_DYNAMIC_STATE_VIEWPORT or VK_DYNAMIC_STATE_SCISSOR you are responsible for setting the values before rendering.
// In theory we should aim to backup/restore those values but I am not sure this is possible.
// If we add a call to vkCmdSetScissor() to cover the full viewport that would fix things for majority of users BUT would made it harder to notice your bug. (See github #4644)
}
bool ImGui_ImplVulkan_CreateFontsTexture(VkCommandBuffer command_buffer)