Add a stub "vertex routine" fuzzer

BUILD.gn

@@ -97,6 +97,18 @@ config("swiftshader_config") {
   }
 }
 
+source_set("vertex_routine_fuzzer") {
+  sources = [
+    "tests/fuzzers/VertexRoutineFuzzer.cpp"
+  ]
+  include_dirs = [
+    "src/",
+  ]
+  deps = [
+    "src/OpenGL/libGLESv2:swiftshader_libGLESv2_static",
+  ]
+}
+
 group("swiftshader") {
   data_deps = [
     "src/OpenGL/libGLESv2:swiftshader_libGLESv2",

src/OpenGL/libGLESv2/BUILD.gn

@@ -50,17 +50,11 @@ config("swiftshader_libGLESv2_private_config") {
   }
 }
 
-swiftshader_shared_library("swiftshader_libGLESv2") {
-  if (!is_mac) {
-    output_name = "libGLESv2"
-    output_dir = "$root_out_dir/swiftshader"
-  }
-
+swiftshader_static_library("swiftshader_libGLESv2_static") {
   deps = [
     "../../OpenGL/compiler:swiftshader_opengl_compiler",
     "../../Reactor:swiftshader_reactor",
     "../../Renderer:swiftshader_renderer",
-    "//build/config:exe_and_shlib_deps",
   ]
 
   sources = [
@@ -80,14 +74,37 @@ swiftshader_shared_library("swiftshader_libGLESv2") {
     "VertexArray.cpp",
     "VertexDataManager.cpp",
     "libGLESv2.cpp",
-    "libGLESv2.def",
-    "libGLESv2.rc",
     "libGLESv3.cpp",
     "main.cpp",
     "resource.h",
     "utilities.cpp",
   ]
 
+  configs = [ ":swiftshader_libGLESv2_private_config" ]
+
+  include_dirs = [
+    "../../../include",
+    "../..",
+    "..",
+  ]
+}
+
+swiftshader_shared_library("swiftshader_libGLESv2") {
+  if (!is_mac) {
+    output_name = "libGLESv2"
+    output_dir = "$root_out_dir/swiftshader"
+  }
+
+  deps = [
+    ":swiftshader_libGLESv2_static",
+    "//build/config:exe_and_shlib_deps",
+  ]
+
+  sources = [
+    "libGLESv2.def",
+    "libGLESv2.rc",
+  ]
+
   if (is_win) {
     ldflags = [ "/DEF:" + rebase_path("libGLESv2.def", root_build_dir) ]
   } else if (is_mac) {

src/swiftshader.gni

@@ -45,3 +45,14 @@ template("swiftshader_shared_library") {
     }
   }
 }
+
+template("swiftshader_static_library") {
+  static_library(target_name) {
+    configs -= configs_to_delete
+    configs += configs_to_add
+    forward_variables_from(invoker, "*", [ "configs" ])
+    if (defined(invoker.configs)) {
+      configs += invoker.configs
+    }
+  }
+}

tests/fuzzers/VertexRoutineFuzzer.cpp

+#include "OpenGL/libGLESv2/Device.hpp"
+
+#include <cstdint>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    return 0;
+}