libvulkan: Set window transform based on swapchain preTransform (178b6966) · Commits · e / os / platform_frameworks_native

vulkan/libvulkan/swapchain.cpp

+46 −0

Original line number	Diff line number	Diff line
		@@ -154,6 +154,32 @@ VkSurfaceTransformFlagBitsKHR TranslateNativeToVulkanTransform(int native) {
		}
		}

		int InvertTransformToNative(VkSurfaceTransformFlagBitsKHR transform) {
		switch (transform) {
		case VK_SURFACE_TRANSFORM_ROTATE_90_BIT_KHR:
		return NATIVE_WINDOW_TRANSFORM_ROT_270;
		case VK_SURFACE_TRANSFORM_ROTATE_180_BIT_KHR:
		return NATIVE_WINDOW_TRANSFORM_ROT_180;
		case VK_SURFACE_TRANSFORM_ROTATE_270_BIT_KHR:
		return NATIVE_WINDOW_TRANSFORM_ROT_90;
		// TODO(jessehall): See TODO in TranslateNativeToVulkanTransform.
		// case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_BIT_KHR:
		// return NATIVE_WINDOW_TRANSFORM_FLIP_H;
		// case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_90_BIT_KHR:
		// return NATIVE_WINDOW_TRANSFORM_FLIP_H \|
		// NATIVE_WINDOW_TRANSFORM_ROT_90;
		// case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_180_BIT_KHR:
		// return NATIVE_WINDOW_TRANSFORM_FLIP_V;
		// case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_270_BIT_KHR:
		// return NATIVE_WINDOW_TRANSFORM_FLIP_V \|
		// NATIVE_WINDOW_TRANSFORM_ROT_90;
		case VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR:
		case VK_SURFACE_TRANSFORM_INHERIT_BIT_KHR:
		default:
		return 0;
		}
		}

		// ----------------------------------------------------------------------------

		struct Surface {
		@@ -455,6 +481,26 @@ VkResult CreateSwapchainKHR_Bottom(VkDevice device,
		return VK_ERROR_INITIALIZATION_FAILED;
		}

		// VkSwapchainCreateInfo::preTransform indicates the transformation the app
		// applied during rendering. native_window_set_transform() expects the
		// inverse: the transform the app is requesting that the compositor perform
		// during composition. With native windows, pre-transform works by rendering
		// with the same transform the compositor is applying (as in Vulkan), but
		// then requesting the inverse transform, so that when the compositor does
		// it's job the two transforms cancel each other out and the compositor ends
		// up applying an identity transform to the app's buffer.
		err = native_window_set_buffers_transform(
		surface.window.get(),
		InvertTransformToNative(create_info->preTransform));
		if (err != 0) {
		// TODO(jessehall): Improve error reporting. Can we enumerate possible
		// errors and translate them to valid Vulkan result codes?
		ALOGE("native_window_set_buffers_transform(%d) failed: %s (%d)",
		InvertTransformToNative(create_info->preTransform),
		strerror(-err), err);
		return VK_ERROR_INITIALIZATION_FAILED;
		}

		err = native_window_set_scaling_mode(
		surface.window.get(), NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
		if (err != 0) {