win32 stuff moved under pltf

src/pltf/win32/gl_funcs.c

@@ -0,0 +1,33 @@
+#include "../gl_funcs.h"
+#include "log.h"
+#include "pltf_win32.h"
+
+#define X(type, name) \
+type name = NULL
+
+PLTF_GL_FUNCS(X)
+#undef X
+
+#define X(type, name) \
+name = (type) pltf_gl_function_load(#name)
+
+void* pltf_gl_function_load(const char* name) {
+    void* gl_func = (void*) wglGetProcAddress(name);
+    if (gl_func == NULL || gl_func == (void*) 1 || gl_func == (void*) 2 || gl_func == (void*) 3 || gl_func == (void*) -1) {
+        void* gl32_func = (void*) GetProcAddress(opengl_module, name);
+        if (gl32_func == NULL || gl32_func == (void*) 1 || gl32_func == (void*) 2 || gl32_func == (void*) 3 || gl32_func == (void*) -1) {
+            LOG_ERRORF("wglGetProcAddress failed to load gl function %s. Returned %p\n", name, gl_func);
+            LOG_ERRORF("GetProcAddress    failed to load gl function %s. Returned %p\n", name, gl32_func);
+            return NULL;
+        }
+
+        return gl32_func;
+    }
+
+    return gl_func;
+}
+
+void pltf_gl_funcs_load() {
+    PLTF_GL_FUNCS(X)
+}
+