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/*
* 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.
*
* Copyright 2021, Blender Foundation.
*/
/** \file
* \ingroup draw_engine
*/
#pragma once
#include "image_private.hh"
namespace blender::draw::image_engine {
class SpaceNodeAccessor : public AbstractSpaceAccessor {
SpaceNode *snode;
public:
SpaceNodeAccessor(SpaceNode *snode) : snode(snode)
{
}
Image *get_image(Main *bmain) override
{
return BKE_image_ensure_viewer(bmain, IMA_TYPE_COMPOSITE, "Viewer Node");
}
ImageUser *get_image_user() override
{
return nullptr;
}
ImBuf *acquire_image_buffer(Image *image, void **lock) override
{
return BKE_image_acquire_ibuf(image, nullptr, lock);
}
void release_buffer(Image *image, ImBuf *ibuf, void *lock) override
{
BKE_image_release_ibuf(image, ibuf, lock);
}
void get_shader_parameters(ShaderParameters &r_shader_parameters, ImBuf *ibuf) override
{
if ((snode->flag & SNODE_USE_ALPHA) != 0) {
/* Show RGBA */
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHOW_ALPHA | IMAGE_DRAW_FLAG_APPLY_ALPHA;
}
else if ((snode->flag & SNODE_SHOW_ALPHA) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHUFFLING;
copy_v4_fl4(r_shader_parameters.shuffle, 0.0f, 0.0f, 0.0f, 1.0f);
}
else if ((snode->flag & SNODE_SHOW_R) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHUFFLING;
if (IMB_alpha_affects_rgb(ibuf)) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_APPLY_ALPHA;
}
copy_v4_fl4(r_shader_parameters.shuffle, 1.0f, 0.0f, 0.0f, 0.0f);
}
else if ((snode->flag & SNODE_SHOW_G) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHUFFLING;
if (IMB_alpha_affects_rgb(ibuf)) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_APPLY_ALPHA;
}
copy_v4_fl4(r_shader_parameters.shuffle, 0.0f, 1.0f, 0.0f, 0.0f);
}
else if ((snode->flag & SNODE_SHOW_B) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHUFFLING;
if (IMB_alpha_affects_rgb(ibuf)) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_APPLY_ALPHA;
}
copy_v4_fl4(r_shader_parameters.shuffle, 0.0f, 0.0f, 1.0f, 0.0f);
}
else /* RGB */ {
if (IMB_alpha_affects_rgb(ibuf)) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_APPLY_ALPHA;
}
}
}
void get_gpu_textures(Image *image,
ImageUser *iuser,
ImBuf *ibuf,
GPUTexture **r_gpu_texture,
bool *r_owns_texture,
GPUTexture **r_tex_tile_data) override
{
*r_gpu_texture = BKE_image_get_gpu_texture(image, iuser, ibuf);
*r_owns_texture = false;
*r_tex_tile_data = nullptr;
}
bool use_tile_drawing() const override
{
return false;
}
/**
* The backdrop of the node editor isn't drawn in screen space UV space. But is locked with the
* screen.
*/
void init_ss_to_texture_matrix(const ARegion *region,
const float image_resolution[2],
float r_uv_to_texture[4][4]) const override
{
unit_m4(r_uv_to_texture);
float display_resolution[2];
mul_v2_v2fl(display_resolution, image_resolution, snode->zoom);
const float scale_x = display_resolution[0] / region->winx;
const float scale_y = display_resolution[1] / region->winy;
const float translate_x = ((region->winx - display_resolution[0]) * 0.5f + snode->xof) /
region->winx;
const float translate_y = ((region->winy - display_resolution[1]) * 0.5f + snode->yof) /
region->winy;
r_uv_to_texture[0][0] = scale_x;
r_uv_to_texture[1][1] = scale_y;
r_uv_to_texture[3][0] = translate_x;
r_uv_to_texture[3][1] = translate_y;
}
};
} // namespace blender::draw::image_engine
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