minecraft-pi-reborn/media-layer/core/gles/src/passthrough.h

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#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#include <libreborn/libreborn.h>
// Load GL Function
#define GL_FUNC(name, return_type, args) \
typedef return_type (*real_##name##_t)args; \
\
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static real_##name##_t real_##name() { \
static real_##name##_t func = NULL; \
if (!func) { \
func = (real_##name##_t) glfwGetProcAddress(#name); \
if (!func) { \
ERR("Error Resolving GL Symbol: " #name ": %s", dlerror()); \
} \
} \
return func; \
}