#
# Copyright (c) 2017 The Khronos Group Inc.
# Copyright (c) 2017 Valve Corporation
# Copyright (c) 2017 LunarG, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Author: Lenny Komow <lenny@lunarg.com>
#

# This code is used to pass on physical device extensions through the call chain. It must do this without creating a stack frame,
# because the actual parameters of the call are not known. Since the first parameter is known to be a VkPhysicalDevice, it can
# unwrap the physical device, overwriting the wrapped device, and then jump to the next function in the call chain

.intel_syntax noprefix
.include "gen_defines.asm"

.ifdef X86_64

.set PHYS_DEV_SIZE, 8
.set PHYS_DEV_UNWRAP_OFFSET, 16
.set PTR_SIZE, 8

.macro PhysDevExtTramp num
.global vkPhysDevExtTramp\num
vkPhysDevExtTramp\num:
    mov     rax, [rdi]
    mov     rdi, [rdi + PHYS_DEV_UNWRAP_OFFSET]
    jmp     [rax + (PHYS_DEV_DISP_OFFSET + (PTR_SIZE * \num))]
.endm

.else
# NOTE: The 32-bit code has not been properly tested, so it likely won't work

.set PHYS_DEV_SIZE, 4
.set PHYS_DEV_UNWRAP_OFFSET, 8
.set PTR_SIZE, 4

.macro PhysDevExtTramp num
.global vkPhysDevExtTramp\num
vkPhysDevExtTramp\num:
    mov     eax, [esp + PHYS_DEV_SIZE]                  # Load the wrapped VkPhysicalDevice into eax
    mov     ecx, [eax + PHYS_DEV_UNWRAP_OFFSET]         # Load the unwrapped VkPhysicalDevice into ecx
    mov     [esp + PHYS_DEV_SIZE], ecx                  # Overwrite the wrapped VkPhysicalDevice with the unwrapped one (on the stack)
    mov     eax, [eax]                                  # Dereference the wrapped VkPhysicalDevice to get the dispatch table in eax
    jmp     [eax + (PHYS_DEV_DISP_OFFSET + (PTR_SIZE * \num))] # Dereference the wrapped VkPhysicalDevice to get the dispatch table in eax
.endm

.endif

.text

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