Refactor render-test to make cross platform (#1053)

* First pass of render-test refactor.

* Make window construction a function that can choose an implementation.

* Remove OpenGL as currently has windows dependency.

* Disable Vulkan as Renderer impl has dependency on windows.

* Pass Window in as parameter of 'update'.

* Add win-window.cpp as was missing.

* Fix warning on windows about signs during comparison.

1 files changed, 76 insertions, 0 deletions

diff --git a/tools/gfx/vulkan/vk-module.cpp b/tools/gfx/vulkan/vk-module.cpp
new file mode 100644
index 000000000..4e92a3d2c
--- /dev/null
+++ b/tools/gfx/vulkan/vk-module.cpp
@@ -0,0 +1,76 @@
+// module.cpp
+#include "vk-module.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+
+#if SLANG_WINDOWS_FAMILY
+#   include <windows.h>
+#else
+#   include <dlfcn.h>
+#endif
+
+namespace gfx {
+using namespace Slang;
+
+// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! VulkanModule !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+Slang::Result VulkanModule::init()
+{
+    if (isInitialized())
+    {
+        destroy();
+        return SLANG_OK;
+    }
+
+    const char* dynamicLibraryName = "Unknown";
+
+#if SLANG_WINDOWS_FAMILY
+    dynamicLibraryName = "vulkan-1.dll";
+    HMODULE module = ::LoadLibraryA(dynamicLibraryName);
+    m_module = (void*)module;
+#else
+    dynamicLibraryName = "libvulkan.so.1";
+    m_module = dlopen(dynamicLibraryName, RTLD_NOW);
+#endif
+
+    if (!m_module)
+    {
+        fprintf(stderr, "error: failed load '%s'\n", dynamicLibraryName);
+        return SLANG_FAIL;
+    }
+
+    return SLANG_OK;
+}
+
+PFN_vkVoidFunction VulkanModule::getFunction(const char* name) const
+{
+    assert(m_module);
+    if (!m_module)
+    {
+        return nullptr;
+    }
+#if SLANG_WINDOWS_FAMILY
+    return (PFN_vkVoidFunction)::GetProcAddress((HMODULE)m_module, name);
+#else
+    return (PFN_vkVoidFunction)dlsym(m_module, name);
+#endif
+}
+
+void VulkanModule::destroy()
+{
+    if (!isInitialized())
+    {
+        return;
+    }
+
+#if SLANG_WINDOWS_FAMILY
+    ::FreeLibrary((HMODULE)m_module);
+#else
+    dlclose(m_module);
+#endif
+    m_module = nullptr;
+}
+
+} // renderer_test