/*
 * Copyright 2011-2013 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __BUFFERS_H__
#define __BUFFERS_H__

#include "device/device_memory.h"

#include "render/film.h"

#include "kernel/kernel_types.h"

#include "util/util_half.h"
#include "util/util_string.h"
#include "util/util_thread.h"
#include "util/util_types.h"

CCL_NAMESPACE_BEGIN

class Device;
struct DeviceDrawParams;
struct float4;

/* Buffer Parameters
 * Size of render buffer and how it fits in the full image (border render). */

class BufferParams {
public:
	/* width/height of the physical buffer */
	int width;
	int height;

	/* offset into and width/height of the full buffer */
	int full_x;
	int full_y;
	int full_width;
	int full_height;

	/* passes */
	vector<Pass> passes;
	bool denoising_data_pass;
	/* If only some light path types should be denoised, an additional pass is needed. */
	bool denoising_clean_pass;

	/* functions */
	BufferParams();

	void get_offset_stride(int& offset, int& stride);
	bool modified(const BufferParams& params);
	void add_pass(PassType type);
	int get_passes_size();
	int get_denoising_offset();
};

/* Render Buffers */

class RenderBuffers {
public:
	/* buffer parameters */
	BufferParams params;

	/* float buffer */
	device_vector<float> buffer;
	bool map_neighbor_copied;
	double render_time;

	explicit RenderBuffers(Device *device);
	~RenderBuffers();

	void reset(BufferParams& params);
	void zero();

	bool copy_from_device();
	bool get_pass_rect(PassType type, float exposure, int sample, int components, float *pixels, const string &name);
	bool get_denoising_pass_rect(int offset, float exposure, int sample, int components, float *pixels);
};

/* Display Buffer
 *
 * The buffer used for drawing during render, filled by converting the render
 * buffers to byte of half float storage */

class DisplayBuffer {
public:
	/* buffer parameters */
	BufferParams params;
	/* dimensions for how much of the buffer is actually ready for display.
	 * with progressive render we can be using only a subset of the buffer.
	 * if these are zero, it means nothing can be drawn yet */
	int draw_width, draw_height;
	/* draw alpha channel? */
	bool transparent;
	/* use half float? */
	bool half_float;
	/* byte buffer for converted result */
	device_pixels<uchar4> rgba_byte;
	device_pixels<half4> rgba_half;

	DisplayBuffer(Device *device, bool linear = false);
	~DisplayBuffer();

	void reset(BufferParams& params);

	void draw_set(int width, int height);
	void draw(Device *device, const DeviceDrawParams& draw_params);
	bool draw_ready();
};

/* Render Tile
 * Rendering task on a buffer */

class RenderTile {
public:
	typedef enum { PATH_TRACE, DENOISE } Task;

	Task task;
	int x, y, w, h;
	int start_sample;
	int num_samples;
	int sample;
	int resolution;
	int offset;
	int stride;
	int tile_index;

	device_ptr buffer;
	int device_size;

	RenderBuffers *buffers;

	RenderTile();
};

CCL_NAMESPACE_END

#endif  /* __BUFFERS_H__ */