Haxel Engine learning 9-- Modern OpenGL (Glad)

最新推荐文章于 2021-05-20 15:33:51 发布

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本文介绍如何将Glad库集成到Hazel项目中，并通过修改premake5.lua文件来解决glad.h与glfw3.h之间的冲突问题。此外，还介绍了如何加载Glad并初始化OpenGL。

Cherno视频：https://www.youtube.com/watch?v=HFyHIc89z1g&t=498s

下载Glad:

修改Hazel\premake5.lua，把Glad链接进Hazel

workspace "Hazel"
	architecture "x64"

	configurations{
		"Debug",
		"Release",
		"Dist"
	}

outputdir = "%{cfg.buildcfg}-%{cfg.system}-%{cfg.architecture}" --Debug-Windows-x64

-- include directory relative to root folder (solution directory)
IncludeDir = {}
IncludeDir["GLFW"] = "Hazel/vendor/GLFW/include"
IncludeDir["Glad"] = "Hazel/vendor/Glad/include"
include "Hazel/vendor/GLFW"   --include Hazel/vendor/GLFW/premake5.lua
include "Hazel/vendor/Glad"
project "Hazel"
	location "Hazel"
	kind "SharedLib" --dll
	language "C++"

	targetdir("bin/" .. outputdir .. "/%{prj.name}")
	objdir("bin-int/" .. outputdir .. "/%{prj.name}")

	pchheader "hzpch.h"
	pchsource "Hazel/src/hzpch.cpp"

	files
	{
		"%{prj.name}/src/**.h",
		"%{prj.name}/src/**.cpp",
	}

	includedirs
	{
		"%{prj.name}/vendor/spdlog/include",
		"%{prj.name}/src",
		"%{IncludeDir.GLFW}",
		"%{IncludeDir.Glad}",
	}

	links{
		"GLFW",
		"Glad",
		"opengl32.lib"
	}


	filter "system:windows"
		cppdialect "C++17"
		staticruntime "Off" --linking the runtime library
		systemversion "latest"

		defines
		{
			"HZ_BUILD_DLL",
			"HZ_PLATFORM_WINDOWS",
		}

		--create a postbuild step to put the .dll where we want to be
		postbuildcommands{
			("{COPY} %{cfg.buildtarget.relpath} ../bin/" ..outputdir.. "/Sandbox")
		}

		filter "configurations:Debug" --only apply to Debug configurations
			defines "HZ_DEGUG"
			--buildoptions "/MDd"
			symbols "On"

		filter "configurations:Release" --only apply to Debug configurations
			defines "HZ_RELEASE"
			--buildoptions "/MD"
			optimize "On"
		
		filter "configurations:Dist" --only apply to Debug configurations
			defines "HZ_DIST"
			--buildoptions "/MD"
			optimize "On"
			
project "Sandbox"
	location "Sandbox"
	kind "ConsoleApp" --.exe
	language "C++"

	targetdir("bin/" .. outputdir .. "/%{prj.name}")
	objdir("bin-int/" .. outputdir .. "/%{prj.name}")



	files
	{
		"%{prj.name}/src/**.h",
		"%{prj.name}/src/**.cpp",
	}
	includedirs
	{
		"Hazel/vendor/spdlog/include",
		"Hazel/src"

	}

	links{
		"Hazel"
	}


	filter "system:windows"
		cppdialect "C++17"
		staticruntime "Off" --linking the runtime library
		systemversion "latest"

		defines
		{
			"HZ_PLATFORM_WINDOWS",
		}

		filter "configurations:Debug" --only apply to Debug configurations
			defines "HZ_DEGUG"
			--buildoptions "/MDd"
			symbols "On"

		filter "configurations:Release" --only apply to Debug configurations
			defines "HZ_RELEASE"
			--buildoptions "/MD"
			optimize "On"
		
		filter "configurations:Dist" --only apply to Debug configurations
			defines "HZ_DIST"
			--buildoptions "/MD"
			optimize "On"

同时，给Glad写一个premak5.lua

Hazel\Hazel\vendor\Glad\premake5.lua

project "Glad"
    kind "StaticLib"
    language "C"
    
    targetdir ("bin/" .. outputdir .. "/%{prj.name}")
    objdir ("bin-int/" .. outputdir .. "/%{prj.name}")

    files
    {
        "include/glad/glad.h",
        "include/KHR/khrplatform.h",
        "src/glad.c",
       
    }

	includedirs
	{
		"include"
	}
    
    filter "system:windows"
        systemversion "latest"
        staticruntime "On"
        
    filter { "system:windows", "configurations:Release" }
        buildoptions "/MT"

这里可能会出现错误：

原因是 glad.h和glfw3.h都include了gl.h

glfw3.h:

所以我们只要定义 GLFW_INCLUDE_NONE，让glfw3.h不包含 gl.h,每次要用gl.h只需include"glad.h"即可

project "Hazel"
	location "Hazel"
	kind "SharedLib" --dll
	language "C++"

	targetdir("bin/" .. outputdir .. "/%{prj.name}")
	objdir("bin-int/" .. outputdir .. "/%{prj.name}")

	pchheader "hzpch.h"
	pchsource "Hazel/src/hzpch.cpp"

	files
	{
		"%{prj.name}/src/**.h",
		"%{prj.name}/src/**.cpp",
	}

	includedirs
	{
		"%{prj.name}/vendor/spdlog/include",
		"%{prj.name}/src",
		"%{IncludeDir.GLFW}",
		"%{IncludeDir.Glad}",
	}

	links{
		"GLFW",
		"Glad",
		"opengl32.lib"
	}


	filter "system:windows"
		cppdialect "C++17"
		staticruntime "Off" --linking the runtime library
		systemversion "latest"

		defines
		{
			"HZ_BUILD_DLL",
			"HZ_PLATFORM_WINDOWS",
			"GLFW_INCLUDE_NONE",
		}

		--create a postbuild step to put the .dll where we want to be
		postbuildcommands{
			("{COPY} %{cfg.buildtarget.relpath} ../bin/" ..outputdir.. "/Sandbox")
		}

		filter "configurations:Debug" --only apply to Debug configurations
			defines "HZ_DEGUG"
			--buildoptions "/MDd"
			symbols "On"

		filter "configurations:Release" --only apply to Debug configurations
			defines "HZ_RELEASE"
			--buildoptions "/MD"
			optimize "On"
		
		filter "configurations:Dist" --only apply to Debug configurations
			defines "HZ_DIST"
			--buildoptions "/MD"
			optimize "On"

加载glad

	int status = gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
	HZ_CORE_ASSET(status, "Failed to initialize GLAD");