Merge branch 'main' of https://github.com/ThisisGame/cpp-game-engine-book

Author: ThisisGame

files/deferred_rendering/ssao/export/ssao_corner.mesh

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+我们将需要用到UV计算的数据，都写入到了G-Buffer中。
+
+这里有一点要特别注意，在延迟渲染阶段，其实是一个屏幕后处理，片段Shader中是对全屏像素进行处理的，那么在计算光照效果时，是全屏幕每个像素都参与的。
+
+这就带来了问题，环境光，它会对屏幕每个像素都计算一遍，给屏幕上每个像素都渲染成环境光的颜色。
+
+但是为什么实际运行效果又没有出现这个问题呢？
+
+```glsl
+vec3 frag_diffuse_color = texture(u_frag_diffuse_color_texture,v_uv).rgb;
+
+//ambient
+vec3 ambient_color = u_ambient.data.color * u_ambient.data.intensity * frag_diffuse_color;
+```
+
+这个关键就在`frag_diffuse_color`，在渲染到G-Buffer阶段，只有实际有顶点数据存在的片段，才会被渲染到`frag_diffuse_color`，空白区域`frag_diffuse_color`是(0,0,0)，不管是环境光还是方向光、点光源的计算都是要乘以`frag_diffuse_color`，那么空白区域就都是(0,0,0)。
+
+
+然后还有一个问题，glClearColor清屏颜色被写入到了G-Buffer的所有FBO中了，对G-Buffer中存储的几何数据造成了影响，所以glClearColor只能用黑色来清屏了。

files/deferred_rendering/ssao/ssao_corner.blend

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+cmake-build-debug*
+.idea
+out
+data
+depends

files/deferred_rendering/ssao/ssao_corner.fbx

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+cmake_minimum_required(VERSION 3.17)
+project(ssao)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_definitions(-D GLM_SWIZZLE)#GLM开启重排，随意转换。 vec2 v2 = v4.xz();
+
+add_definitions(-D USE_FMOD_STUDIO)#是否使用fmod studio，加载bank文件的形式。
+
+
+if (MSVC)
+    add_compile_options(/bigobj)
+    add_compile_options(/wd4819)#忽略保存为unicode警告
+endif ()
+
+
+
+include(CMakeLists.txt.glfw)
+include(CMakeLists.txt.FreeType)
+include(CMakeLists.txt.fmod)
+include(CMakeLists.txt.easy_profile_core)
+include(CMakeLists.txt.lua_script)
+include(CMakeLists.txt.luasocket)
+include(CMakeLists.txt.Physx)
+include(CMakeLists.txt.imgui)
+
+#拷贝depends目录
+file(COPY "../../template/depends/glfw-3.3-3.4/" DESTINATION "../depends/glfw-3.3-3.4/")
+file(COPY "../../template/depends/glm/" DESTINATION "../depends/glm/")
+file(COPY "../../template/depends/glm_ext/" DESTINATION "../depends/glm/")
+file(COPY "../../template/depends/timetool/" DESTINATION "../depends/timetool/")
+file(COPY "../../template/depends/rapidxml/" DESTINATION "../depends/rapidxml/")
+file(COPY "../../template/depends/stb/" DESTINATION "../depends/stb/")
+file(COPY "../../template/depends/spdlog/include/spdlog/" DESTINATION "../depends/spdlog/")
+file(COPY "../../template/depends/rttr-0.9.6/src/rttr/" DESTINATION "../depends/rttr/")
+file(COPY "../../template/depends/easy_profiler-2.1.0/easy_profiler_core/" DESTINATION "../depends/easy_profiler_core/")
+file(COPY "../../template/depends/SPSCQueue-1.1/" DESTINATION "../depends/spscqueue/")
+
+#拷贝data文件
+file(COPY "../../template/data/audio/integrate_physx/" DESTINATION "../data/audio/")
+file(COPY "../../template/data/images/plane_albedo.cpt" DESTINATION "../data/images/")
+file(COPY "../../template/data/images/plane_metal.cpt" DESTINATION "../data/images/")
+file(COPY "../../template/data/images/urban.cpt" DESTINATION "../data/images/")
+file(COPY "../../template/data/model/ssao_corner.mesh" DESTINATION "../data/model/")
+file(COPY "../../template/data/material/default_ssao_gbuffer.mat" DESTINATION "../data/material/")
+file(COPY "../../template/data/shader/default_ssao_gbuffer.vert" DESTINATION "../data/shader/")
+file(COPY "../../template/data/shader/default_ssao_gbuffer.frag" DESTINATION "../data/shader/")
+file(COPY "../../template/data/material/default_renderer_to_ssao_buffer.mat" DESTINATION "../data/material/")
+file(COPY "../../template/data/shader/default_renderer_to_ssao_buffer.vert" DESTINATION "../data/shader/")
+file(COPY "../../template/data/shader/default_renderer_to_ssao_buffer.frag" DESTINATION "../data/shader/")
+file(COPY "../../template/data/material/default_ssao_deferred_rendering.mat" DESTINATION "../data/material/")
+file(COPY "../../template/data/shader/default_ssao_deferred_rendering.vert" DESTINATION "../data/shader/")
+file(COPY "../../template/data/shader/default_ssao_deferred_rendering.frag" DESTINATION "../data/shader/")
+
+#头文件目录
+include_directories("depends")
+include_directories("source")
+
+file(GLOB_RECURSE engine_cpp source/*.cpp)
+file(GLOB_RECURSE rttr_cpp "depends/rttr/*.cpp")
+file(GLOB_RECURSE example_cpp example/*.cpp)
+
+add_executable(${PROJECT_NAME} ${glfw_sources} ${rttr_cpp} ${freetype_src} ${easy_profiler_core_source} ${lua_src} ${luasocket_c} ${imgui_src}  ${engine_cpp} ${example_cpp})
+
+if (MSVC)
+    set_property(TARGET ${PROJECT_NAME} PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+else()
+    add_definitions(-D _DEBUG)
+endif ()

files/deferred_rendering/ssao/ssao_corner.mesh

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+#拷贝depends目录
+file(COPY "../../template/depends/freetype-2.11.0/" DESTINATION "../depends/freetype/")
+
+add_definitions(-D FT2_BUILD_LIBRARY)
+#add_definitions(-D FT_DEBUG_LEVEL_TRACE)
+
+if (WIN32)
+    add_compile_options(/wd4312)#忽略类型转换错误警告
+elseif (UNIX)
+    add_definitions(-D HAVE_UNISTD_H)
+    add_definitions(-D HAVE_FCNTL_H)
+endif ()
+
+include_directories("depends/freetype")
+include_directories("depends/freetype/include")
+
+
+file(GLOB freetype_public_header "depends/freetype/include/ft2build.h" "depends/freetype/include/freetype/*.h")
+file(GLOB freetype_public_config_header "include/freetype/config/*.h")
+file(GLOB freetype_private_header "include/freetype/internal/*.h")
+set(freetype_base_src depends/freetype/src/autofit/autofit.c
+        depends/freetype/src/base/ftbase.c
+        depends/freetype/src/base/ftbbox.c
+        depends/freetype/src/base/ftbdf.c
+        depends/freetype/src/base/ftbitmap.c
+        depends/freetype/src/base/ftcid.c
+        depends/freetype/src/base/ftfstype.c
+        depends/freetype/src/base/ftgasp.c
+        depends/freetype/src/base/ftglyph.c
+        depends/freetype/src/base/ftgxval.c
+        depends/freetype/src/base/ftinit.c
+        depends/freetype/src/base/ftmm.c
+        depends/freetype/src/base/ftotval.c
+        depends/freetype/src/base/ftpatent.c
+        depends/freetype/src/base/ftpfr.c
+        depends/freetype/src/base/ftstroke.c
+        depends/freetype/src/base/ftsynth.c
+        depends/freetype/src/base/fttype1.c
+        depends/freetype/src/base/ftwinfnt.c
+        depends/freetype/src/bdf/bdf.c
+        depends/freetype/src/bzip2/ftbzip2.c
+        depends/freetype/src/cache/ftcache.c
+        depends/freetype/src/cff/cff.c
+        depends/freetype/src/cid/type1cid.c
+        depends/freetype/src/gzip/ftgzip.c
+        depends/freetype/src/lzw/ftlzw.c
+        depends/freetype/src/pcf/pcf.c
+        depends/freetype/src/pfr/pfr.c
+        depends/freetype/src/psaux/psaux.c
+        depends/freetype/src/pshinter/pshinter.c
+        depends/freetype/src/psnames/psnames.c
+        depends/freetype/src/raster/raster.c
+        depends/freetype/src/sdf/sdf.c
+        depends/freetype/src/sfnt/sfnt.c
+        depends/freetype/src/smooth/smooth.c
+        depends/freetype/src/truetype/truetype.c
+        depends/freetype/src/type1/type1.c
+        depends/freetype/src/type42/type42.c
+        depends/freetype/src/winfonts/winfnt.c)
+
+if (UNIX)
+    list(APPEND freetype_base_src "depends/freetype/builds/unix/ftsystem.c")
+elseif (WIN32)
+    list(APPEND freetype_base_src "depends/freetype/builds/windows/ftsystem.c")
+else ()
+    list(APPEND freetype_base_src "depends/freetype/src/base/ftsystem.c")
+endif ()
+
+
+if (WIN32)
+    enable_language(RC)
+    list(APPEND freetype_base_src depends/freetype/builds/windows/ftdebug.c
+            depends/freetype/src/base/ftver.rc)
+elseif (WINCE)
+    list(APPEND freetype_base_src depends/freetype/builds/wince/ftdebug.c)
+else ()
+    list(APPEND freetype_base_src depends/freetype/src/base/ftdebug.c)
+endif ()
+
+set(freetype_src ${freetype_base_src} ${freetype_public_header} ${freetype_public_config_header} ${freetype_private_header})

imgs/deferred_rendering/ssao/clear_color_write_to_all_fbo.jpg

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+#下载Physx.7z
+function(DownloadPhysx)
+    MESSAGE("Download physx-4.1.7z")
+    file(DOWNLOAD "https://github.com/ThisisGame/PhysX/releases/download/v6.4/physx-4.1.7z" "../../../template/depends/physx-4.1.7z" SHOW_PROGRESS)
+endfunction()
+
+#检测physx.7z是否存在，不存在则下载
+if(EXISTS "../../../template/depends/physx-4.1.7z")
+    MESSAGE("found physx-4.1.7z")
+    file(SIZE "../../../template/depends/physx-4.1.7z" SIZE_PHYSX)
+    MESSAGE("size of physx-4.1.7z: ${SIZE_PHYSX}")
+    #检查大小是否匹配
+    if(${SIZE_PHYSX} EQUAL 46553903)
+        MESSAGE("physx-4.1.7z is valid")
+    else()
+        MESSAGE("physx-4.1.7z is invalid")
+        DownloadPhysx()
+    endif()
+else()
+    DownloadPhysx()
+endif()
+
+
+
+#解压physx.7z
+if(EXISTS "../../../template/depends/physx-4.1")
+    MESSAGE("found physx")
+else()
+    MESSAGE("not find physx,extract physx-4.1.7z")
+    file(ARCHIVE_EXTRACT INPUT "../../../template/depends/physx-4.1.7z" DESTINATION "../../../template/depends/" VERBOSE)
+endif()
+
+
+#拷贝
+file(COPY "../../template/depends/physx-4.1/" DESTINATION "../depends/physx/")
+
+#头文件目录
+include_directories("depends/physx/physx/include")
+include_directories("depends/physx/pxshared/include")
+
+#链接目录
+if(MSVC)
+    link_directories("depends/physx/physx/bin/win.x86_64.vc142.mt/debug")
+    #链接lib文件
+    link_libraries(PhysX_64 PhysXFoundation_64 PhysXExtensions_static_64 PhysXPvdSDK_static_64)
+    #拷贝dll到exe目录
+    file(COPY "depends/physx/physx/bin/win.x86_64.vc142.mt/debug/PhysXFoundation_64.dll" DESTINATION "./")
+    file(COPY "depends/physx/physx/bin/win.x86_64.vc142.mt/debug/PhysXDevice64.dll" DESTINATION "./")
+    file(COPY "depends/physx/physx/bin/win.x86_64.vc142.mt/debug/PhysXCooking_64.dll" DESTINATION "./")
+    file(COPY "depends/physx/physx/bin/win.x86_64.vc142.mt/debug/PhysXCommon_64.dll" DESTINATION "./")
+    file(COPY "depends/physx/physx/bin/win.x86_64.vc142.mt/debug/PhysX_64.dll" DESTINATION "./")
+else()
+    link_directories("depends/physx/physx/bin/mac.x86_64/debug")
+    #链接lib文件
+    link_libraries(PhysX_static_64 PhysXFoundation_static_64 PhysXExtensions_static_64 PhysXPvdSDK_static_64 PhysXCommon_static_64)
+endif()