Examples: Vulkan: Fixed an extra validation (tested on Windows with VulkanSDK 1.0.46.0) (#1042)

Examples: Vulkan: Various very minor stylistic fixes, fixing typos in comments, etc. (#1042 #1043)

Image presentation now depends on the completeness of command buffer submission through semaphores. ...

To maintain maximum frame rate we render to the last acquired swapchain image but present the last but one drawn image. This behavior is optional through conditional compilation macros.

Removed redundant VkResult plugged into VkPresentInfoKHR pResults attribute. This is only meaningful when we present directly to multiple swapchains. In that case we can an VkResult per swapchain.

Removed redundant barrier. ...

The transition of the swapchain image(s) can happen implicitly in the renderpass. This approach has been stated to be more efficient than using an explicit barrier.
See "Vulkan Programming Guide", Chapter 7: "Graphics Pipelines", section "Renderpasses".

Fixed all issues found by vulkan debug report. Reasons for the major design changes are commented.

Examples: Vulkan: Disable IMGUI_VULKAN_DEBUG_REPORT by default. Update .bat files for newer VulkanSDK.

Vulkan backend: optionally enabling vulkan validation layers and debug report callback ...

Additional layer, extension and the callback itself are used/created when IMGUI_VULKAN_DEBUG_REPORT is defined. The callback reports seven (potential!) errors which will be fixed with another pull request.

Merge branch 'g_FrameIndex_not_used_fix' of https://github.com/ParticlePeter/imgui into ParticlePeter-g_FrameIndex_not_used_fix

Examples: Vulkan: windows batch file for 64-bits.

Merge branch 'vk_small_fix' of https://github.com/martty/imgui into martty-vk_small_fix

Clip negative scissor offsets to zero

Set required depth member for buffer image copy

typo, #elif instead of #else, fixed

Vulkan backend: g_FrameIndex not used fix -> huge perf gain ...

Added a macro to switch between unlimited frame rate (VK_PRESENT_MODE_IMMEDIATE_KHR) and limited to 60 fps (VK_PRESENT_MODE_FIFO_KHR). Only the latter mode is guaranteed to be available, but the former one most likely is.

Fix scissor offset being negative

Fix new Vulkan validation warnings

Examples: Vulkan: Coding style fixes (#910)

Vulkan example: Proper surface format search.

Vulkan example: Fix gamma for some implementations.

Vulkan example: Fix validation layer warnings and errors and redeclare gl_PerVertex.

Examples: Vulkan: Shallow stylistic changes (following #879)

Add location decorators & change to use structs as in/out in glsl, update embedded spv (produced with glslangValidator -x)

Null the released resources

Added a void* user_data parameter to Clipboard function handlers. (#875)

Fixing minor english typos (#827)

Examples: Accessing ImVector fields directly, feel less stl-ey and fix renderer side assert when render list only contains a callback (#810)

Fix Vulkan example for use when a depth buffer is active.

tabs to space, remove braces

maxImageCount may be 0; add missing sType; change to 1 push constant range