Pioneer on RaspberryPi

Use OpenGL 3.1 on Pi
Add PIONEER_TARGET_RASPBERRY_PI define in CmakeLists

CMakeLists.txt

@@ -77,6 +77,14 @@ if (USE_AVX2)
 	endif()
 endif(USE_AVX2)
 
+# Default to enabling PIONEER_TARGET_RASPBERRY_PI if we're compiling on ARM64
+option(PIONEER_TARGET_RASPBERRY_PI "Compile for Raspberry Pi specifically (degrades to OpenGL 3.1)" ${PIONEER_TARGET_ARM64})
+
+if (PIONEER_TARGET_RASPBERRY_PI)
+	# add_compile_options("-mcpu=cortex-a76" "-ffast-math")
+	add_compile_options("-ffast-math")
+endif(PIONEER_TARGET_RASPBERRY_PI)
+
 option(USE_LLD_LINKER "Use the LLVM lld linker instead of gcc's linker" OFF)
 if (CMAKE_COMPILER_IS_GNUCXX)
 	add_compile_options(

CMakePresets.json

@@ -77,8 +77,7 @@
 			"cacheVariables": {
 				"CMAKE_EXPORT_COMPILE_COMMANDS": true,
 				"CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}",
-				"CMAKE_BUILD_TYPE": "Debug",
-				"PROFILER_ENABLED": "1"
+				"CMAKE_BUILD_TYPE": "Debug"
 			},
 			"vendor": {
 				"microsoft.com/VisualStudioSettings/CMake/1.0": {
@@ -138,8 +137,7 @@
 				"CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}",
 				"CMAKE_BUILD_TYPE": "Debug",
 				"CMAKE_C_COMPILER": "/usr/bin/clang",
-				"CMAKE_CXX_COMPILER": "/usr/bin/clang++",
-				"PROFILER_ENABLED": "1"
+				"CMAKE_CXX_COMPILER": "/usr/bin/clang++"
 			},
 			"vendor": {
 				"microsoft.com/VisualStudioSettings/CMake/1.0": {

scripts/CMakeExperimentalPresets.json

@@ -0,0 +1,68 @@
+{
+	"version": 2,
+	"configurePresets": [
+		{
+			"name": "RPi-Linux-Debug",
+			"displayName": "Linux RPi Debug",
+			"description": "Use system compiler; Profiler=no",
+			"binaryDir": "${sourceDir}/build/",
+			"cacheVariables": {
+				"CMAKE_EXPORT_COMPILE_COMMANDS": true,
+				"CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}",
+				"CMAKE_BUILD_TYPE": "Debug",
+				"USE_SSE42": false,
+				 "USE_AVX2": false,
+				 "PIONEER_TARGET_RASPBERRY_PI": true
+			},
+			"vendor": {
+				"microsoft.com/VisualStudioSettings/CMake/1.0": {
+					"hostOS": [
+						"Linux"
+					]
+				}
+			}
+		},
+		{
+			"name": "RPi-Linux-Profiler",
+			"displayName": "Linux RPi Profiling",
+			"description": "Use system compiler; Profiler=yes",
+			"binaryDir": "${sourceDir}/build/",
+			"cacheVariables": {
+				"CMAKE_EXPORT_COMPILE_COMMANDS": true,
+				"CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}",
+				"CMAKE_BUILD_TYPE": "RelWithDebInfo",
+				"PROFILER_ENABLED": "1",
+				"USE_SSE42": false,
+				"USE_AVX2": false,
+				"PIONEER_TARGET_RASPBERRY_PI": true
+			},
+			"vendor": {
+				"microsoft.com/VisualStudioSettings/CMake/1.0": {
+					"hostOS": [
+						"Linux"
+					]
+				}
+			}
+		},
+		{
+			"name": "RPi-linux-release",
+			"displayName": "Linux RPi Release",
+			"description": "Use system compiler; Opt=yes; Profiler=no",
+			"binaryDir": "${sourceDir}/build/",
+			"cacheVariables": {
+				"CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}",
+				"CMAKE_BUILD_TYPE": "Release",
+				"USE_SSE42": false,
+				"USE_AVX2": false,
+				"PIONEER_TARGET_RASPBERRY_PI": true
+			},
+			"vendor": {
+				"microsoft.com/VisualStudioSettings/CMake/1.0": {
+					"hostOS": [
+						"Linux"
+					]
+				}
+			}
+		}
+	]
+}

src/graphics/opengl/RendererGL.cpp

@@ -49,9 +49,16 @@ namespace Graphics {
 		Uint32 winFlags = 0;
 
 		winFlags |= SDL_WINDOW_OPENGL;
-		// We'd like a context that implements OpenGL 3.2 to allow creation of multisampled textures
+		// We'd like a context that implements OpenGL 3.1 to allow creation of multisampled textures
 		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+#if defined(PIONEER_TARGET_RASPBERRY_PI)
+		// on Arm and other platforms we attempt to create an OpenGL 3.1 context as this is what Raspberry Pi 4 & 5 currently support
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
+#else
+		// x86/x64 we use newer OpenGL
 		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+#endif
+
 		// Request core profile as we're uninterested in old fixed-function API
 		// also cannot initialise 3.x context on OSX with anything but CORE profile
 		SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
@@ -194,11 +201,19 @@ namespace Graphics {
 		if (vs.enableDebugMessages)
 			GLDebug::Enable();
 
+#if defined(PIONEER_TARGET_RASPBERRY_PI)
+		// on Arm and other platforms we attempt to create an OpenGL 3.1 context as this is what Raspberry Pi 4 & 5 currently support
+		if (!glewIsSupported("GL_VERSION_3_1")) {
+			Error("Pioneer can not run on your device (Raspberry Pi?) as it does not appear to support OpenGL 3.1");
+		}
+#else
+		// x86/x64 we use newer OpenGL
 		if (!glewIsSupported("GL_VERSION_3_2")) {
 			Error(
 				"Pioneer can not run on your graphics card as it does not appear to support OpenGL 3.2\n"
 				"Please check to see if your GPU driver vendor has an updated driver - or that drivers are installed correctly.");
 		}
+#endif
 
 		if (!glewIsSupported("GL_EXT_texture_compression_s3tc")) {
 			if (glewIsSupported("GL_ARB_texture_compression")) {