/*************************************************************************/
/*  rendering_device.cpp                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "rendering_device.h"

RenderingDevice *RenderingDevice::singleton = nullptr;

RenderingDevice *RenderingDevice::get_singleton() {
	return singleton;
}

RenderingDevice::ShaderCompileFunction RenderingDevice::compile_function = nullptr;
RenderingDevice::ShaderCacheFunction RenderingDevice::cache_function = nullptr;

void RenderingDevice::shader_set_compile_function(ShaderCompileFunction p_function) {
	compile_function = p_function;
}
void RenderingDevice::shader_set_cache_function(ShaderCacheFunction p_function) {
	cache_function = p_function;
}

Vector<uint8_t> RenderingDevice::shader_compile_from_source(ShaderStage p_stage, const String &p_source_code, ShaderLanguage p_language, String *r_error, bool p_allow_cache) {
	if (p_allow_cache && cache_function) {
		Vector<uint8_t> cache = cache_function(p_stage, p_source_code, p_language);
		if (cache.size()) {
			return cache;
		}
	}

	ERR_FAIL_COND_V(!compile_function, Vector<uint8_t>());

	return compile_function(p_stage, p_source_code, p_language, r_error);
}

RenderingDevice::RenderingDevice() {
	if (singleton == nullptr) { // there may be more rendering devices later
		singleton = this;
	}
}