From 5ae23241be06ca1a42dcf60070b7104c2669b117 Mon Sep 17 00:00:00 2001
From: Vitalii Koshura <lestat.de.lionkur@gmail.com>
Date: Tue, 22 Aug 2023 01:33:08 +0200
Subject: [PATCH] [Android] Try to enhance GPU detection

Signed-off-by: Vitalii Koshura <lestat.de.lionkur@gmail.com>
---
 client/gpu_opencl.cpp | 82 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/client/gpu_opencl.cpp b/client/gpu_opencl.cpp
index 5f0c48a5b11..d892c81bf82 100644
--- a/client/gpu_opencl.cpp
+++ b/client/gpu_opencl.cpp
@@ -219,17 +219,77 @@ void COPROCS::get_opencl(
 #else
 #ifdef __APPLE__
     opencl_lib = dlopen("/System/Library/Frameworks/OpenCL.framework/Versions/Current/OpenCL", RTLD_NOW);
+#elif defined ANDROID
+    // std::string opencl_lib_path = "/system/vendor/lib/libOpenCL.so";
+    std::string libarch_name;
+    if (sizeof(void*) == 8) {
+        libarch_name = "lib64";
+    }
+    else {
+        libarch_name = "lib";
+    }
+
+    std::string opencl_lib_path;
+androidretry:
+    if (opencl_lib_path.empty()) {
+        opencl_lib_path = "libOpenCL.so";
+    }
+    else if (opencl_lib_path == "libOpenCL.so") {
+        opencl_lib_path = "libOpenCL.so.1";
+    }
+    else if (opencl_lib_path == "libOpenCL.so.1") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/libOpenCL.so";
+    }
+    else if (opencl_lib_path == "/vendor/" + libarch_name + "/libOpenCL.so") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/egl/libGLES_mali.so";
+    }
+    else if (opencl_lib_path == "/vendor/" + libarch_name + "/egl/libGLES_mali.so") {
+        opencl_lib_path = "/system_ext/" + libarch_name + "libOpenCL_system.so";
+    }
+    else if (opencl_lib_path == "/system_ext/" + libarch_name + "libOpenCL_system.so") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/libGLES_adreno.so";
+    }
+    else if (opencl_lib_path == "/vendor/" + libarch_name + "/libGLES_adreno.so") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/libGLESv2_adreno.so";
+    }
+    else if (opencl_lib_path == "/vendor/" + libarch_name + "/libGLESv2_adreno.so") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/libGLESv3_adreno.so";
+    }
+    else if (opencl_lib_path == "/vendor/" + libarch_name + "/libGLESv3_adreno.so") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/egl/libGLES_adreno.so";
+    }
+    else if (opencl_lib_path == "/vendor/" + libarch_name + "/egl/libGLES_adreno.so") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/egl/libGLESv2_adreno.so";
+    }
+    else if (opencl_lib_path == "/vendor/" + libarch_name + "/egl/libGLESv2_adreno.so") {
+        opencl_lib_path = "/vendor/" + libarch_name + "/egl/libGLESv3_adreno.so";
+    }
+    else {
+        snprintf(buf, sizeof(buf), "OpenCL: %s", dlerror());
+        gpu_warning(warnings, buf);
+        goto leave;
+    }
+    opencl_lib = dlopen(opencl_lib_path.c_str(), RTLD_NOW);
+    snprintf(buf, sizeof(buf), "Opening OpenCL: %s", opencl_lib_path.c_str());
+    gpu_warning(warnings, buf);
+    if (!opencl_lib) {
+        snprintf(buf, sizeof(buf), "Failed to open OpenCL: %s", opencl_lib_path.c_str());
+        gpu_warning(warnings, buf);
+        goto androidretry;
+    }
 #else
     opencl_lib = dlopen("libOpenCL.so", RTLD_NOW);
     if (!opencl_lib) {
         opencl_lib = dlopen("libOpenCL.so.1", RTLD_NOW);
     }
 #endif
+#ifndef ANDROID
     if (!opencl_lib) {
         snprintf(buf, sizeof(buf), "OpenCL: %s", dlerror());
         gpu_warning(warnings, buf);
         return;
     }
+#endif
     p_clGetPlatformIDs = (cl_int(*)(cl_uint, cl_platform_id*, cl_uint*)) dlsym( opencl_lib, "clGetPlatformIDs" );
     p_clGetPlatformInfo = (cl_int(*)(cl_platform_id, cl_platform_info, size_t, void*, size_t*)) dlsym( opencl_lib, "clGetPlatformInfo" );
     p_clGetDeviceIDs = (cl_int(*)(cl_platform_id, cl_device_type, cl_uint, cl_device_id*, cl_uint*)) dlsym( opencl_lib, "clGetDeviceIDs" );
@@ -238,25 +298,47 @@ void COPROCS::get_opencl(
 
     if (!p_clGetPlatformIDs) {
         gpu_warning(warnings, "clGetPlatformIDs() missing from OpenCL library");
+#ifdef ANDROID
+        goto androidretry;
+#else
         goto leave;
+#endif
     }
     if (!p_clGetPlatformInfo) {
         gpu_warning(warnings, "clGetPlatformInfo() missing from OpenCL library");
+#ifdef ANDROID
+        goto androidretry;
+#else
         goto leave;
+#endif
     }
     if (!p_clGetDeviceIDs) {
         gpu_warning(warnings, "clGetDeviceIDs() missing from OpenCL library");
+#ifdef ANDROID
+        goto androidretry;
+#else
         goto leave;
+#endif
     }
     if (!p_clGetDeviceInfo) {
         gpu_warning(warnings, "clGetDeviceInfo() missing from OpenCL library");
+#ifdef ANDROID
+        goto androidretry;
+#else
         goto leave;
+#endif
     }
 
     ciErrNum = (*p_clGetPlatformIDs)(MAX_OPENCL_PLATFORMS, platforms, &num_platforms);
     if ((ciErrNum != CL_SUCCESS) || (num_platforms == 0)) {
+        snprintf(buf, sizeof(buf), "clGetPlatformIDs() failed; error %d, num_platforms", ciErrNum, num_platforms);
+        gpu_warning(warnings, buf);
         gpu_warning(warnings, "clGetPlatformIDs() failed to return any OpenCL platforms");
+#ifdef ANDROID
+        goto androidretry;
+#else
         goto leave;
+#endif
     }
 
     if (nvidia_gpus.size()) {