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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 DefaultDrawingMode : public AbstractDrawingMode {
private:
DRWPass *create_image_pass() const
{
/* Write depth is needed for background overlay rendering. Near depth is used for
* transparency checker and Far depth is used for indicating the image size. */
DRWState state = static_cast<DRWState>(DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH |
DRW_STATE_DEPTH_ALWAYS | DRW_STATE_BLEND_ALPHA_PREMUL);
return DRW_pass_create("Image", state);
}
void add_to_shgroup(AbstractSpaceAccessor *space,
DRWShadingGroup *grp,
const Image *image,
const ImBuf *image_buffer) const
{
float image_mat[4][4];
const DRWContextState *draw_ctx = DRW_context_state_get();
const ARegion *region = draw_ctx->region;
space->get_image_mat(image_buffer, region, image_mat);
GPUBatch *geom = DRW_cache_quad_get();
const bool is_tiled_texture = image && image->source == IMA_SRC_TILED;
if (is_tiled_texture) {
const float translate_x = image_mat[3][0];
const float translate_y = image_mat[3][1];
LISTBASE_FOREACH (ImageTile *, tile, &image->tiles) {
const int tile_x = ((tile->tile_number - 1001) % 10);
const int tile_y = ((tile->tile_number - 1001) / 10);
image_mat[3][0] = (float)tile_x + translate_x;
image_mat[3][1] = (float)tile_y + translate_y;
DRW_shgroup_call_obmat(grp, geom, image_mat);
}
}
else {
DRW_shgroup_call_obmat(grp, geom, image_mat);
}
}
public:
void cache_init(IMAGE_Data *vedata) const override
{
IMAGE_PassList *psl = vedata->psl;
psl->image_pass = create_image_pass();
}
void cache_image(AbstractSpaceAccessor *space,
IMAGE_Data *vedata,
Image *image,
ImageUser *iuser,
ImBuf *image_buffer) const override
{
IMAGE_PassList *psl = vedata->psl;
IMAGE_StorageList *stl = vedata->stl;
IMAGE_PrivateData *pd = stl->pd;
GPUTexture *tex_tile_data = nullptr;
space->get_gpu_textures(
image, iuser, image_buffer, &pd->texture, &pd->owns_texture, &tex_tile_data);
if (pd->texture == nullptr) {
return;
}
const bool is_tiled_texture = tex_tile_data != nullptr;
ShaderParameters sh_params;
sh_params.use_premul_alpha = BKE_image_has_gpu_texture_premultiplied_alpha(image,
image_buffer);
const DRWContextState *draw_ctx = DRW_context_state_get();
const Scene *scene = draw_ctx->scene;
if (scene->camera && scene->camera->type == OB_CAMERA) {
Camera *camera = static_cast<Camera *>(scene->camera->data);
copy_v2_fl2(sh_params.far_near, camera->clip_end, camera->clip_start);
}
space->get_shader_parameters(sh_params, image_buffer, is_tiled_texture);
GPUShader *shader = IMAGE_shader_image_get(is_tiled_texture);
DRWShadingGroup *shgrp = DRW_shgroup_create(shader, psl->image_pass);
if (is_tiled_texture) {
DRW_shgroup_uniform_texture_ex(shgrp, "imageTileArray", pd->texture, GPU_SAMPLER_DEFAULT);
DRW_shgroup_uniform_texture(shgrp, "imageTileData", tex_tile_data);
}
else {
DRW_shgroup_uniform_texture_ex(shgrp, "imageTexture", pd->texture, GPU_SAMPLER_DEFAULT);
}
DRW_shgroup_uniform_vec2_copy(shgrp, "farNearDistances", sh_params.far_near);
DRW_shgroup_uniform_vec4_copy(shgrp, "color", ShaderParameters::color);
DRW_shgroup_uniform_vec4_copy(shgrp, "shuffle", sh_params.shuffle);
DRW_shgroup_uniform_int_copy(shgrp, "drawFlags", sh_params.flags);
DRW_shgroup_uniform_bool_copy(shgrp, "imgPremultiplied", sh_params.use_premul_alpha);
add_to_shgroup(space, shgrp, image, image_buffer);
}
void draw_finish(IMAGE_Data *vedata) const override
{
IMAGE_StorageList *stl = vedata->stl;
IMAGE_PrivateData *pd = stl->pd;
if (pd->texture && pd->owns_texture) {
GPU_texture_free(pd->texture);
pd->owns_texture = false;
}
pd->texture = nullptr;
}
void draw_scene(IMAGE_Data *vedata) const override
{
IMAGE_PassList *psl = vedata->psl;
IMAGE_PrivateData *pd = vedata->stl->pd;
DefaultFramebufferList *dfbl = DRW_viewport_framebuffer_list_get();
GPU_framebuffer_bind(dfbl->default_fb);
static float clear_col[4] = {0.0f, 0.0f, 0.0f, 0.0f};
GPU_framebuffer_clear_color_depth(dfbl->default_fb, clear_col, 1.0);
DRW_view_set_active(pd->view);
DRW_draw_pass(psl->image_pass);
DRW_view_set_active(nullptr);
}
};
} // namespace blender::draw::image_engine
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