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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 SpaceImageAccessor : public AbstractSpaceAccessor {
SpaceImage *sima;
public:
SpaceImageAccessor(SpaceImage *sima) : sima(sima)
{
}
Image *get_image(Main *UNUSED(bmain)) override
{
return ED_space_image(sima);
}
ImageUser *get_image_user() override
{
return &sima->iuser;
}
ImBuf *acquire_image_buffer(Image *UNUSED(image), void **lock) override
{
return ED_space_image_acquire_buffer(sima, lock, 0);
}
void release_buffer(Image *UNUSED(image), ImBuf *image_buffer, void *lock) override
{
ED_space_image_release_buffer(sima, image_buffer, lock);
}
void get_shader_parameters(ShaderParameters &r_shader_parameters, ImBuf *image_buffer) override
{
const int sima_flag = sima->flag & ED_space_image_get_display_channel_mask(image_buffer);
if ((sima_flag & SI_USE_ALPHA) != 0) {
/* Show RGBA */
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHOW_ALPHA | IMAGE_DRAW_FLAG_APPLY_ALPHA;
}
else if ((sima_flag & SI_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 ((sima_flag & SI_SHOW_ZBUF) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_DEPTH | IMAGE_DRAW_FLAG_SHUFFLING;
copy_v4_fl4(r_shader_parameters.shuffle, 1.0f, 0.0f, 0.0f, 0.0f);
}
else if ((sima_flag & SI_SHOW_R) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHUFFLING;
if (IMB_alpha_affects_rgb(image_buffer)) {
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 ((sima_flag & SI_SHOW_G) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHUFFLING;
if (IMB_alpha_affects_rgb(image_buffer)) {
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 ((sima_flag & SI_SHOW_B) != 0) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_SHUFFLING;
if (IMB_alpha_affects_rgb(image_buffer)) {
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(image_buffer)) {
r_shader_parameters.flags |= IMAGE_DRAW_FLAG_APPLY_ALPHA;
}
}
}
void get_gpu_textures(Image *image,
ImageUser *iuser,
ImBuf *image_buffer,
GPUTexture **r_gpu_texture,
bool *r_owns_texture,
GPUTexture **r_tex_tile_data) override
{
if (image->rr != nullptr) {
/* Update multi-index and pass for the current eye. */
BKE_image_multilayer_index(image->rr, iuser);
}
else {
BKE_image_multiview_index(image, iuser);
}
if (image_buffer == nullptr) {
return;
}
if (image_buffer->rect == nullptr && image_buffer->rect_float == nullptr) {
/* This code-path is only supposed to happen when drawing a lazily-allocatable render result.
* In all the other cases the `ED_space_image_acquire_buffer()` is expected to return nullptr
* as an image buffer when it has no pixels. */
BLI_assert(image->type == IMA_TYPE_R_RESULT);
float zero[4] = {0, 0, 0, 0};
*r_gpu_texture = GPU_texture_create_2d(__func__, 1, 1, 0, GPU_RGBA16F, zero);
*r_owns_texture = true;
return;
}
const int sima_flag = sima->flag & ED_space_image_get_display_channel_mask(image_buffer);
if (sima_flag & SI_SHOW_ZBUF &&
(image_buffer->zbuf || image_buffer->zbuf_float || (image_buffer->channels == 1))) {
if (image_buffer->zbuf) {
BLI_assert_msg(0, "Integer based depth buffers not supported");
}
else if (image_buffer->zbuf_float) {
*r_gpu_texture = GPU_texture_create_2d(
__func__, image_buffer->x, image_buffer->y, 0, GPU_R16F, image_buffer->zbuf_float);
*r_owns_texture = true;
}
else if (image_buffer->rect_float && image_buffer->channels == 1) {
*r_gpu_texture = GPU_texture_create_2d(
__func__, image_buffer->x, image_buffer->y, 0, GPU_R16F, image_buffer->rect_float);
*r_owns_texture = true;
}
}
else if (image->source == IMA_SRC_TILED) {
*r_gpu_texture = BKE_image_get_gpu_tiles(image, iuser, image_buffer);
*r_tex_tile_data = BKE_image_get_gpu_tilemap(image, iuser, nullptr);
*r_owns_texture = false;
}
else {
*r_gpu_texture = BKE_image_get_gpu_texture(image, iuser, image_buffer);
*r_owns_texture = false;
}
}
bool use_tile_drawing() const override
{
return (sima->flag & SI_DRAW_TILE) != 0;
}
void init_ss_to_texture_matrix(const ARegion *region,
const float UNUSED(image_resolution[2]),
float r_uv_to_texture[4][4]) const override
{
unit_m4(r_uv_to_texture);
float scale_x = 1.0 / BLI_rctf_size_x(®ion->v2d.cur);
float scale_y = 1.0 / BLI_rctf_size_y(®ion->v2d.cur);
float translate_x = scale_x * -region->v2d.cur.xmin;
float translate_y = scale_y * -region->v2d.cur.ymin;
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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