[c-host] fixed project for cross compliation for Win on Linux

Thanks @fatalis for your guidance on this

VERSION

@@ -1 +1 @@
-a12-207-g84b2917706+1
+a12-208-g86f4256b5a+1

c-host/README.md

@@ -36,6 +36,8 @@ Don't ask if you can't figure it out, this code is the very definition of experi
 
 Hint:
 
+### For Windows on Windows
+
 ```
 mkdir build
 cd build
@@ -43,6 +45,24 @@ cmake -G "MSYS Makefiles" ..
 make
 ```
 
+### For Linux on Linux
+
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+
+### For Windows cross compiling on Linux
+
+```
+mkdir build
+cd build
+cmake -DCMAKE_TOOLCHAIN_FILE=../toolchain-mingw64.cmake ..
+make
+```
+
 ## Where is the log?
 
 It is in your user's temp directory:

c-host/platform/Windows/CMakeLists.txt

@@ -13,7 +13,7 @@ add_library(platform_Windows STATIC
 
 add_subdirectory("capture")
 
-FIND_PROGRAM(WINDRES_EXECUTABLE NAMES "windres.exe" DOC "windres executable")
+FIND_PROGRAM(WINDRES_EXECUTABLE NAMES "x86_64-w64-mingw32-windres" "windres.exe" DOC "windres executable")
 ADD_CUSTOM_COMMAND(TARGET platform_Windows POST_BUILD
 	WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
 	COMMAND ${WINDRES_EXECUTABLE} -i resource.rc -o "${PROJECT_BINARY_DIR}/resource.o"

c-host/platform/Windows/capture/CMakeLists.txt

@@ -7,10 +7,12 @@ option(USE_NVFBC "Enable NVFBC Support" OFF)
 option(USE_DXGI  "Enable DXGI Support" ON)
 
 if(NOT DEFINED NVFBC_SDK)
-  set(NVFBC_SDK "C:\\Program Files (x86)\\NVIDIA Corporation\\NVIDIA Capture SDK")
+  set(NVFBC_SDK "C:/Program Files (x86)/NVIDIA Corporation/NVIDIA Capture SDK")
 endif()
 
-if(NOT EXISTS "${NVFBC_SDK}\\inc" OR NOT IS_DIRECTORY "${NVFBC_SDK}\\inc")
+file(TO_CMAKE_PATH "${NVFBC_SDK}" nvfbc_sdk)
+
+if(NOT EXISTS "${nvfbc_sdk}/inc" OR NOT IS_DIRECTORY "${nvfbc_sdk}/inc")
   message("Disabling NVFBC support, can't find the SDK headers")
   set(USE_NVFBC OFF)
 endif()

c-host/platform/Windows/capture/DXGI/CMakeLists.txt

@@ -7,7 +7,7 @@ add_library(capture_DXGI STATIC
 
 add_definitions("-DCOBJMACROS -DINITGUID")
 
-FIND_PROGRAM(DLLTOOL_EXECUTABLE NAMES "dlltool.exe" DOC "dlltool executable")
+FIND_PROGRAM(DLLTOOL_EXECUTABLE NAMES "x86_64-w64-mingw32-dlltool" "dlltool" "dlltool.exe" DOC "dlltool executable")
 ADD_CUSTOM_COMMAND(TARGET capture_DXGI POST_BUILD
 	WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}/dll"
 	COMMAND ${DLLTOOL_EXECUTABLE} --def libd3d11.def --output-lib "${PROJECT_BINARY_DIR}/libd3d11.dll"

c-host/platform/Windows/capture/DXGI/src/dxgi_extra.h

@@ -26,8 +26,10 @@ HRESULT __stdcall CreateDXGIFactory1(REFIID riid, void **factory);
 #define D3D_FEATURE_LEVEL_12_0 0xc000
 #define D3D_FEATURE_LEVEL_12_1 0xc100
 
+#ifndef __dxgicommon_h__
 #define DXGI_ERROR_ACCESS_LOST           _HRESULT_TYPEDEF_(0x887A0026L)
 #define DXGI_ERROR_WAIT_TIMEOUT          _HRESULT_TYPEDEF_(0x887A0027L)
+#endif
 
 enum DXGI_OUTDUPL_POINTER_SHAPE_TYPE {
   DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MONOCHROME = 1,
@@ -188,6 +190,7 @@ typedef struct DXGI_MODE_DESC1
 }
 DXGI_MODE_DESC1;
 
+#ifndef __dxgicommon_h__
 typedef enum DXGI_COLOR_SPACE_TYPE {
     DXGI_COLOR_SPACE_RGB_FULL_G22_NONE_P709             = 0,
     DXGI_COLOR_SPACE_RGB_FULL_G10_NONE_P709             = 1,
@@ -216,6 +219,7 @@ typedef enum DXGI_COLOR_SPACE_TYPE {
     DXGI_COLOR_SPACE_YCBCR_STUDIO_G24_TOPLEFT_P2020     = 24,
     DXGI_COLOR_SPACE_CUSTOM                             = 0xFFFFFFFF
 } DXGI_COLOR_SPACE_TYPE;
+#endif
 
 DEFINE_GUID(IID_IDXGIOutput1, 0x00cddea8, 0x939b, 0x4b83, 0xa3,0x40,0xa6,0x85,0x22,0x66,0x66,0xcc);
 

c-host/platform/Windows/capture/NVFBC/CMakeLists.txt

@@ -2,11 +2,12 @@ cmake_minimum_required(VERSION 3.0)
 project(capture_NVFBC LANGUAGES C CXX)
 
 add_library(capture_NVFBC STATIC
-	src/nvFBC.c
+	src/nvfbc.c
 	src/wrapper.cpp
 )
 
-include_directories("${NVFBC_SDK}\\inc")
+file(TO_CMAKE_PATH "${NVFBC_SDK}" nvfbc_sdk)
+include_directories(file, "${nvfbc_sdk}/inc")
 
 target_include_directories(capture_NVFBC
 	PRIVATE

c-host/toolchain-mingw64.cmake

@@ -0,0 +1,17 @@
+# the name of the target operating system
+SET(CMAKE_SYSTEM_NAME Windows)
+
+# which compilers to use for C and C++
+SET(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
+SET(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
+SET(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
+
+# here is the target environment located
+SET(CMAKE_FIND_ROOT_PATH /usr/x86_64-w64-mingw32)
+
+# adjust the default behaviour of the FIND_XXX() commands:
+# search headers and libraries in the target environment, search
+# programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)