// MIT License
// 
// Copyright (C) 2018-2023, Tellusim Technologies Inc. https://tellusim.com/
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#include <common/common.h>
#include <math/TellusimMath.h>
#include <platform/TellusimDevice.h>
#include <platform/TellusimPipeline.h>
#include <platform/TellusimCommand.h>

/*
 */
using namespace Tellusim;

/*
 */
int32_t main(int32_t argc, char **argv) {
	
	DECLARE_WINDOW
	
	// create window
	String title = String::format("%s Tellusim::ParallaxCube", window.getPlatformName());
	if(!window.create(title) || !window.setHidden(false)) return 1;
	
	// structures
	struct CommonParameters {
		Matrix4x4f projection;
		Matrix4x4f modelview;
		Matrix4x4f transform;
		Vector4f icamera;
		Vector4f ilight;
		Vector4f camera;
		Vector4f light;
	};
	
	// create device
	Device device(window);
	if(!device) return 1;
	
	// create target
	Target target = device.createTarget(window);
	
	// create pipeline
	Pipeline pipeline = device.createPipeline();
	pipeline.setUniformMask(0, Shader::MaskVertex);
	pipeline.setSamplerMask(0, Shader::MaskFragment);
	pipeline.setTextureMask(0, Shader::MaskFragment);
	pipeline.addAttribute(Pipeline::AttributePosition, FormatRGBf32, 0, sizeof(float32_t) * 0, sizeof(float32_t) * 8);
	pipeline.setColorFormat(window.getColorFormat());
	pipeline.setDepthFormat(window.getDepthFormat());
	pipeline.setDepthFunc(Pipeline::DepthFuncLessEqual);
	pipeline.setCullMode(target.isFlipped() ? Pipeline::CullModeBack : Pipeline::CullModeFront);
	if(!pipeline.loadShaderGLSL(Shader::TypeVertex, "main.shader", "VERTEX_SHADER=1")) return 1;
	if(!pipeline.loadShaderGLSL(Shader::TypeFragment, "main.shader", "FRAGMENT_SHADER=1")) return 1;
	if(!pipeline.create()) return 1;
	
	// create sampler
	Sampler sampler = device.createSampler(Sampler::FilterTrilinear, Sampler::WrapModeClamp);
	if(!sampler) return 1;
	
	// create texture
	Texture texture = device.loadTexture("height.ktx", Texture::FlagMipmaps);
	if(!texture) return 1;
	
	// create sphere geometry
	#include "main_sphere.h"
	Buffer sphere_vertex_buffer = device.createBuffer(Buffer::FlagVertex, sphere_vertices, sizeof(float32_t) * num_sphere_vertices);
	Buffer sphere_index_buffer = device.createBuffer(Buffer::FlagIndex, sphere_indices, sizeof(uint32_t) * num_sphere_indices);
	if(!sphere_vertex_buffer || !sphere_index_buffer) return 1;
	
	// main loop
	DECLARE_GLOBAL
	window.run([&]() -> bool {
		DECLARE_COMMON
		
		Window::update();
		
		if(!window.render()) return false;
		
		// window title
		if(fps > 0.0f) window.setTitle(String::format("%s %.1f FPS", title.get(), fps));
		
		// window target
		target.setClearColor(0.2f, 0.2f, 0.2f, 1.0f);
		target.begin();
		{
			// create command list
			Command command = device.createCommand(target);
			
			// set pipeline
			command.setPipeline(pipeline);
			command.setSampler(0, sampler);
			command.setTexture(0, texture);
			
			// set buffers
			command.setVertexBuffer(0, sphere_vertex_buffer);
			command.setIndexBuffer(FormatRu32, sphere_index_buffer);
			
			// set common parameters
			CommonParameters common_parameters;
			common_parameters.camera = Vector4f(3.0f, 3.0f, 1.0f, 0.0f);
			common_parameters.light = Vector4f(3.0f, 3.0f, 6.0f, 0.0f);
			common_parameters.projection = Matrix4x4f::perspective(60.0f, (float32_t)window.getWidth() / window.getHeight(), 0.1f, 1000.0f);
			common_parameters.modelview = Matrix4x4f::lookAt(Vector3f(common_parameters.camera), Vector3f(0.0f, 0.0f, 0.0f), Vector3f(0.0f, 0.0f, 1.0f));
			common_parameters.transform = Matrix4x4f::rotateZ(time * 16.0f) * Matrix4x4f::rotateY(time * 4.0f) * Matrix4x4f::scale(4.0f, 4.0f, 4.0f);
			common_parameters.icamera = inverse(common_parameters.transform) * common_parameters.camera;
			common_parameters.ilight = inverse(common_parameters.transform) * common_parameters.light;
			if(target.isFlipped()) common_parameters.projection = Matrix4x4f::scale(1.0f, -1.0f, 1.0f) * common_parameters.projection;
			command.setUniform(0, common_parameters);
			
			// draw sphere
			command.drawElements(num_sphere_indices);
		}
		target.end();
		
		if(!window.present()) return false;
		
		if(!device.check()) return false;
		
		return true;
	});
	
	// finish context
	window.finish();
	
	return 0;
}