/*
 * ***** 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) 2013 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_vectTransform.c
 *  \ingroup shdnodes
 */
 
#include "../node_shader_util.h"

/* **************** Vector Transform ******************** */ 
static bNodeSocketTemplate sh_node_vect_transform_in[] = {
	{ SOCK_VECTOR, 1, N_("Vector"), 0.5f, 0.5f, 0.5f, 1.0f, -10000.0f, 10000.0f, PROP_NONE},
	{ -1, 0, "" }
};

static bNodeSocketTemplate sh_node_vect_transform_out[] = {
	{ SOCK_VECTOR, 0, N_("Vector")},
	{ -1, 0, "" }
};

static void node_shader_init_vect_transform(bNodeTree *UNUSED(ntree), bNode *node)
{
	NodeShaderVectTransform *vect = MEM_callocN(sizeof(NodeShaderVectTransform), "NodeShaderVectTransform");
	
	/* Convert World into Object Space per default */
	vect->convert_to = 1;
	
	node->storage = vect;
}

static const float (* get_matrix_from_to(ShaderCallData *scd, short from, short to))[4]
{
	switch (from) {
		case SHD_VECT_TRANSFORM_SPACE_OBJECT:
			switch (to) {
				case SHD_VECT_TRANSFORM_SPACE_OBJECT:
					return NULL;
				case SHD_VECT_TRANSFORM_SPACE_WORLD:
					return RE_object_instance_get_matrix(scd->shi->obi, RE_OBJECT_INSTANCE_MATRIX_OB);
				case SHD_VECT_TRANSFORM_SPACE_CAMERA:
					return RE_object_instance_get_matrix(scd->shi->obi, RE_OBJECT_INSTANCE_MATRIX_LOCALTOVIEW);
			}
			break;
		case SHD_VECT_TRANSFORM_SPACE_WORLD:
			switch (to) {
				case SHD_VECT_TRANSFORM_SPACE_WORLD:
					return NULL;
				case SHD_VECT_TRANSFORM_SPACE_CAMERA:
					return RE_render_current_get_matrix(RE_VIEW_MATRIX);
				case SHD_VECT_TRANSFORM_SPACE_OBJECT:
					return RE_object_instance_get_matrix(scd->shi->obi, RE_OBJECT_INSTANCE_MATRIX_OBINV);
			}
			break;
		case SHD_VECT_TRANSFORM_SPACE_CAMERA:
			switch (to) {
				case SHD_VECT_TRANSFORM_SPACE_CAMERA:
					return NULL;
				case SHD_VECT_TRANSFORM_SPACE_WORLD:
					return RE_render_current_get_matrix(RE_VIEWINV_MATRIX);
				case SHD_VECT_TRANSFORM_SPACE_OBJECT:
					return RE_object_instance_get_matrix(scd->shi->obi, RE_OBJECT_INSTANCE_MATRIX_LOCALTOVIEWINV);
			}
			break;
	}
	return NULL;
}

static void node_shader_exec_vect_transform(void *data, int UNUSED(thread), bNode *node, bNodeExecData *UNUSED(execdata), bNodeStack **in, bNodeStack **out)
{
	float vec[4];
	const float (*mat)[4];

	if (data) {
		NodeShaderVectTransform *nodeprop = (NodeShaderVectTransform *)node->storage;

		nodestack_get_vec(vec, SOCK_VECTOR, in[0]);

		if (nodeprop->type == SHD_VECT_TRANSFORM_TYPE_POINT)
			vec[3] = 1.0f;
		else
			vec[3] = 0.0f;

		mat = get_matrix_from_to((ShaderCallData *)data, nodeprop->convert_from, nodeprop->convert_to);
		if (mat) {
			mul_m4_v4((float(*)[4])mat, vec);
		}

		if (nodeprop->type == SHD_VECT_TRANSFORM_TYPE_NORMAL)
			normalize_v3(vec);

		copy_v4_v4(out[0]->vec, vec);
	}
}

static GPUNodeLink *get_gpulink_matrix_from_to(short from, short to)
{
	switch (from) {
		case SHD_VECT_TRANSFORM_SPACE_OBJECT:
			switch (to) {
				case SHD_VECT_TRANSFORM_SPACE_OBJECT:
					return NULL;
				case SHD_VECT_TRANSFORM_SPACE_WORLD:
					return GPU_builtin(GPU_OBJECT_MATRIX);
				case SHD_VECT_TRANSFORM_SPACE_CAMERA:
					return GPU_builtin(GPU_LOC_TO_VIEW_MATRIX);
			}
			break;
		case SHD_VECT_TRANSFORM_SPACE_WORLD:
			switch (to) {
				case SHD_VECT_TRANSFORM_SPACE_WORLD:
					return NULL;
				case SHD_VECT_TRANSFORM_SPACE_CAMERA:
					return GPU_builtin(GPU_VIEW_MATRIX);
				case SHD_VECT_TRANSFORM_SPACE_OBJECT:
					return GPU_builtin(GPU_INVERSE_OBJECT_MATRIX);
			}
			break;
		case SHD_VECT_TRANSFORM_SPACE_CAMERA:
			switch (to) {
				case SHD_VECT_TRANSFORM_SPACE_CAMERA:
					return NULL;
				case SHD_VECT_TRANSFORM_SPACE_WORLD:
					return GPU_builtin(GPU_INVERSE_VIEW_MATRIX);
				case SHD_VECT_TRANSFORM_SPACE_OBJECT:
					return GPU_builtin(GPU_INVERSE_LOC_TO_VIEW_MATRIX);
			}
			break;
	}
	return NULL;
}
static int gpu_shader_vect_transform(GPUMaterial *mat, bNode *node, bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
{
	struct GPUNodeLink *inputlink;
	struct GPUNodeLink *fromto;

	int ret = 0;

	const char *vtransform = "direction_transform_m4v3";
	const char *ptransform = "point_transform_m4v3";
	const char *func_name = 0;

	bool new_shading = GPU_material_use_new_shading_nodes(mat);

	NodeShaderVectTransform *nodeprop = (NodeShaderVectTransform *)node->storage;

	if (in[0].hasinput)
		inputlink = in[0].link;
	else
		inputlink = GPU_uniform(in[0].vec);

	fromto = get_gpulink_matrix_from_to(nodeprop->convert_from, nodeprop->convert_to);

	func_name = (nodeprop->type == SHD_VECT_TRANSFORM_TYPE_POINT) ? ptransform : vtransform;
	if (fromto) {
		if (new_shading) {
			/* For cycles we have inverted Z */
			/* TODO: pass here the correct matrices */
			if (nodeprop->convert_from == SHD_VECT_TRANSFORM_SPACE_CAMERA && nodeprop->convert_to != SHD_VECT_TRANSFORM_SPACE_CAMERA) {
				ret = GPU_link(mat, "invert_z", inputlink, &inputlink);
			}
			ret = GPU_link(mat, func_name, inputlink, fromto,  &out[0].link);
			if (nodeprop->convert_to == SHD_VECT_TRANSFORM_SPACE_CAMERA && nodeprop->convert_from != SHD_VECT_TRANSFORM_SPACE_CAMERA) {
				ret = GPU_link(mat, "invert_z", out[0].link, &out[0].link);
			}
		}
		else {
			ret = GPU_link(mat, func_name, inputlink, fromto,  &out[0].link);
		}
	}
	else
		ret = GPU_link(mat, "set_rgb", inputlink,  &out[0].link);

	if (nodeprop->type == SHD_VECT_TRANSFORM_TYPE_NORMAL)
		return GPU_link(mat, "vect_normalize", out[0].link, &out[0].link);

	return ret;
}

void register_node_type_sh_vect_transform(void)
{
	static bNodeType ntype;

	sh_node_type_base(&ntype, SH_NODE_VECT_TRANSFORM, "Vector Transform", NODE_CLASS_CONVERTOR, 0);
	node_type_compatibility(&ntype, NODE_OLD_SHADING | NODE_NEW_SHADING);
	node_type_init(&ntype, node_shader_init_vect_transform);
	node_type_socket_templates(&ntype, sh_node_vect_transform_in, sh_node_vect_transform_out);
	node_type_storage(&ntype, "NodeShaderVectTransform", node_free_standard_storage, node_copy_standard_storage);
	node_type_exec(&ntype, NULL, NULL, node_shader_exec_vect_transform);
	node_type_gpu(&ntype, gpu_shader_vect_transform);

	nodeRegisterType(&ntype);
}