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Fixed bug #1026 Vittorio Giovara 2010-07-16 19:09:28 PDT i was reading SDL_renderer_gles and i noticed that every time we there is some gl call the gl state is modified with a couple of glEnableClientState()/glDisableClientState. While this is completely fine for desktops systems, this is a major performace kill on mobile devices, right where opengles is implemented. Normal practice in this case is to update the glstate once, keep it always the same and disable/enable other states only in very special occasions. On the web there's plenty of documentation (on the top of my head http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5 ) and i personally tried this. I modified my code and got a 10 fps boost, then modified SDL_render_gles and shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i got an 80% performance increase with this technique. I have attached a dif of my changes, hope that it will be included in mainstream.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 19 Jan 2011 23:56:16 -0800
parents fc26fb7e20af
children
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<?xml version="1.0" encoding="Windows-1252"?>
<VisualStudioProject
	ProjectType="Visual C++"
	Version="9.00"
	Name="testgl"
	ProjectGUID="{272D976B-A1DF-4DEB-BD7F-5C0D330E0C7D}"
	TargetFrameworkVersion="131072"
	>
	<Platforms>
		<Platform
			Name="Win32"
		/>
	</Platforms>
	<ToolFiles>
	</ToolFiles>
	<Configurations>
		<Configuration
			Name="Debug|Win32"
			OutputDirectory=".\Debug"
			IntermediateDirectory=".\Debug"
			ConfigurationType="1"
			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC70.vsprops"
			UseOfMFC="0"
			ATLMinimizesCRunTimeLibraryUsage="false"
			>
			<Tool
				Name="VCPreBuildEventTool"
			/>
			<Tool
				Name="VCCustomBuildTool"
			/>
			<Tool
				Name="VCXMLDataGeneratorTool"
			/>
			<Tool
				Name="VCWebServiceProxyGeneratorTool"
			/>
			<Tool
				Name="VCMIDLTool"
				PreprocessorDefinitions="_DEBUG"
				MkTypLibCompatible="true"
				SuppressStartupBanner="true"
				TargetEnvironment="1"
				TypeLibraryName=".\Debug/testgl.tlb"
			/>
			<Tool
				Name="VCCLCompilerTool"
				Optimization="0"
				AdditionalIncludeDirectories="..\..\..\include"
				PreprocessorDefinitions="_DEBUG,WIN32,_WINDOWS,HAVE_OPENGL"
				RuntimeLibrary="3"
				UsePrecompiledHeader="0"
				PrecompiledHeaderFile=".\Debug/testgl.pch"
				AssemblerListingLocation=".\Debug/"
				ObjectFile=".\Debug/"
				ProgramDataBaseFileName=".\Debug/"
				WarningLevel="3"
				SuppressStartupBanner="true"
				DebugInformationFormat="4"
				CompileAs="0"
			/>
			<Tool
				Name="VCManagedResourceCompilerTool"
			/>
			<Tool
				Name="VCResourceCompilerTool"
				PreprocessorDefinitions="_DEBUG"
				Culture="1033"
			/>
			<Tool
				Name="VCPreLinkEventTool"
			/>
			<Tool
				Name="VCLinkerTool"
				AdditionalOptions="/MACHINE:I386"
				AdditionalDependencies="opengl32.lib"
				OutputFile=".\Debug/testgl.exe"
				LinkIncremental="2"
				SuppressStartupBanner="true"
				GenerateDebugInformation="true"
				ProgramDatabaseFile=".\Debug/testgl.pdb"
				SubSystem="2"
				RandomizedBaseAddress="1"
				DataExecutionPrevention="0"
			/>
			<Tool
				Name="VCALinkTool"
			/>
			<Tool
				Name="VCManifestTool"
			/>
			<Tool
				Name="VCXDCMakeTool"
			/>
			<Tool
				Name="VCBscMakeTool"
			/>
			<Tool
				Name="VCFxCopTool"
			/>
			<Tool
				Name="VCAppVerifierTool"
			/>
			<Tool
				Name="VCPostBuildEventTool"
				Description="Copy SDL"
				CommandLine="copy $(SolutionDir)\SDL\$(ConfigurationName)\SDL.dll $(TargetDir)\SDL.dll"
			/>
		</Configuration>
		<Configuration
			Name="Release|Win32"
			OutputDirectory=".\Release"
			IntermediateDirectory=".\Release"
			ConfigurationType="1"
			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC70.vsprops"
			UseOfMFC="0"
			ATLMinimizesCRunTimeLibraryUsage="false"
			>
			<Tool
				Name="VCPreBuildEventTool"
			/>
			<Tool
				Name="VCCustomBuildTool"
			/>
			<Tool
				Name="VCXMLDataGeneratorTool"
			/>
			<Tool
				Name="VCWebServiceProxyGeneratorTool"
			/>
			<Tool
				Name="VCMIDLTool"
				PreprocessorDefinitions="NDEBUG"
				MkTypLibCompatible="true"
				SuppressStartupBanner="true"
				TargetEnvironment="1"
				TypeLibraryName=".\Release/testgl.tlb"
			/>
			<Tool
				Name="VCCLCompilerTool"
				InlineFunctionExpansion="1"
				AdditionalIncludeDirectories="..\..\..\include"
				PreprocessorDefinitions="NDEBUG,WIN32,_WINDOWS,HAVE_OPENGL"
				StringPooling="true"
				RuntimeLibrary="2"
				EnableFunctionLevelLinking="true"
				UsePrecompiledHeader="0"
				PrecompiledHeaderFile=".\Release/testgl.pch"
				AssemblerListingLocation=".\Release/"
				ObjectFile=".\Release/"
				ProgramDataBaseFileName=".\Release/"
				WarningLevel="3"
				SuppressStartupBanner="true"
				CompileAs="0"
			/>
			<Tool
				Name="VCManagedResourceCompilerTool"
			/>
			<Tool
				Name="VCResourceCompilerTool"
				PreprocessorDefinitions="NDEBUG"
				Culture="1033"
			/>
			<Tool
				Name="VCPreLinkEventTool"
			/>
			<Tool
				Name="VCLinkerTool"
				AdditionalOptions="/MACHINE:I386"
				AdditionalDependencies="opengl32.lib"
				OutputFile=".\Release/testgl.exe"
				LinkIncremental="1"
				SuppressStartupBanner="true"
				ProgramDatabaseFile=".\Release/testgl.pdb"
				SubSystem="2"
				RandomizedBaseAddress="1"
				DataExecutionPrevention="0"
			/>
			<Tool
				Name="VCALinkTool"
			/>
			<Tool
				Name="VCManifestTool"
			/>
			<Tool
				Name="VCXDCMakeTool"
			/>
			<Tool
				Name="VCBscMakeTool"
			/>
			<Tool
				Name="VCFxCopTool"
			/>
			<Tool
				Name="VCAppVerifierTool"
			/>
			<Tool
				Name="VCPostBuildEventTool"
				Description="Copy SDL"
				CommandLine="copy $(SolutionDir)\SDL\$(ConfigurationName)\SDL.dll $(TargetDir)\SDL.dll"
			/>
		</Configuration>
	</Configurations>
	<References>
	</References>
	<Files>
		<File
			RelativePath="..\..\..\test\testgl.c"
			>
		</File>
	</Files>
	<Globals>
	</Globals>
</VisualStudioProject>