/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. 
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2005 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/nodes/shader/nodes/node_shader_valToRgb.c
 *  \ingroup shdnodes
 */


#include "node_shader_util.h"
#include "IMB_colormanagement.h"

/* **************** VALTORGB ******************** */
static bNodeSocketTemplate sh_node_valtorgb_in[] = {
	{	SOCK_FLOAT, 1, N_("Fac"),			0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_FACTOR},
	{	-1, 0, ""	}
};
static bNodeSocketTemplate sh_node_valtorgb_out[] = {
	{	SOCK_RGBA, 0, N_("Color")},
	{	SOCK_FLOAT, 0, N_("Alpha")},
	{	-1, 0, ""	}
};

static void node_shader_exec_valtorgb(void *UNUSED(data), int UNUSED(thread), bNode *node, bNodeExecData *UNUSED(execdata), bNodeStack **in, bNodeStack **out)
{
	/* stack order in: fac */
	/* stack order out: col, alpha */
	
	if (node->storage) {
		float fac;
		nodestack_get_vec(&fac, SOCK_FLOAT, in[0]);

		do_colorband(node->storage, fac, out[0]->vec);
		out[1]->vec[0] = out[0]->vec[3];
	}
}

static void node_shader_init_valtorgb(bNodeTree *UNUSED(ntree), bNode *node)
{
	node->storage = add_colorband(true);
}

static int gpu_shader_valtorgb(GPUMaterial *mat, bNode *node, bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
{
	float *array;
	int size;

	colorband_table_RGBA(node->storage, &array, &size);
	return GPU_stack_link(mat, "valtorgb", in, out, GPU_texture(size, array));
}

void register_node_type_sh_valtorgb(void)
{
	static bNodeType ntype;

	sh_node_type_base(&ntype, SH_NODE_VALTORGB, "ColorRamp", NODE_CLASS_CONVERTOR, 0);
	node_type_compatibility(&ntype, NODE_OLD_SHADING | NODE_NEW_SHADING);
	node_type_socket_templates(&ntype, sh_node_valtorgb_in, sh_node_valtorgb_out);
	node_type_init(&ntype, node_shader_init_valtorgb);
	node_type_size_preset(&ntype, NODE_SIZE_LARGE);
	node_type_storage(&ntype, "ColorBand", node_free_standard_storage, node_copy_standard_storage);
	node_type_exec(&ntype, NULL, NULL, node_shader_exec_valtorgb);
	node_type_gpu(&ntype, gpu_shader_valtorgb);

	nodeRegisterType(&ntype);
}


/* **************** RGBTOBW ******************** */
static bNodeSocketTemplate sh_node_rgbtobw_in[] = {
	{   SOCK_RGBA, 1, N_("Color"),          0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 1.0f},
	{   -1, 0, ""   }
};
static bNodeSocketTemplate sh_node_rgbtobw_out[] = {
	{   SOCK_FLOAT, 0, N_("Val"),           0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
	{   -1, 0, ""   }
};


static void node_shader_exec_rgbtobw(void *UNUSED(data), int UNUSED(thread), bNode *UNUSED(node), bNodeExecData *UNUSED(execdata), bNodeStack **in, bNodeStack **out)
{
	/* stack order out: bw */
	/* stack order in: col */
	float col[3];
	nodestack_get_vec(col, SOCK_VECTOR, in[0]);

	out[0]->vec[0] = IMB_colormanagement_get_luminance(col);
}

static int gpu_shader_rgbtobw(GPUMaterial *mat, bNode *UNUSED(node), bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
{
	return GPU_stack_link(mat, "rgbtobw", in, out);
}

void register_node_type_sh_rgbtobw(void)
{
	static bNodeType ntype;

	sh_node_type_base(&ntype, SH_NODE_RGBTOBW, "RGB to BW", NODE_CLASS_CONVERTOR, 0);
	node_type_compatibility(&ntype, NODE_OLD_SHADING | NODE_NEW_SHADING);
	node_type_socket_templates(&ntype, sh_node_rgbtobw_in, sh_node_rgbtobw_out);
	node_type_exec(&ntype, NULL, NULL, node_shader_exec_rgbtobw);
	node_type_gpu(&ntype, gpu_shader_rgbtobw);

	nodeRegisterType(&ntype);
}