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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2020 Blender Foundation. */
/** \file
* \ingroup draw_engine
*
* Draw engine to draw the Image/UV editor
*/
#include "DRW_render.h"
#include <memory>
#include <optional>
#include "BKE_image.h"
#include "BKE_main.h"
#include "BKE_object.h"
#include "DNA_camera_types.h"
#include "DNA_screen_types.h"
#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"
#include "ED_image.h"
#include "GPU_batch.h"
#include "image_drawing_mode.hh"
#include "image_engine.h"
#include "image_private.hh"
#include "image_space_image.hh"
#include "image_space_node.hh"
namespace blender::draw::image_engine {
static std::unique_ptr<AbstractSpaceAccessor> space_accessor_from_context(
const DRWContextState *draw_ctx)
{
const char space_type = draw_ctx->space_data->spacetype;
if (space_type == SPACE_IMAGE) {
return std::make_unique<SpaceImageAccessor>((SpaceImage *)draw_ctx->space_data);
}
if (space_type == SPACE_NODE) {
return std::make_unique<SpaceNodeAccessor>((SpaceNode *)draw_ctx->space_data);
}
BLI_assert_unreachable();
return nullptr;
}
template<
/** \brief Drawing mode to use.
*
* Useful during development to switch between drawing implementations.
*/
typename DrawingMode = ScreenSpaceDrawingMode<OneTextureMethod>>
class ImageEngine {
private:
const DRWContextState *draw_ctx;
IMAGE_Data *vedata;
std::unique_ptr<AbstractSpaceAccessor> space;
DrawingMode drawing_mode;
public:
ImageEngine(const DRWContextState *draw_ctx, IMAGE_Data *vedata)
: draw_ctx(draw_ctx), vedata(vedata), space(space_accessor_from_context(draw_ctx))
{
}
virtual ~ImageEngine() = default;
void cache_init()
{
IMAGE_InstanceData *instance_data = vedata->instance_data;
drawing_mode.cache_init(vedata);
/* Setup full screen view matrix. */
const ARegion *region = draw_ctx->region;
float winmat[4][4], viewmat[4][4];
orthographic_m4(viewmat, 0.0, region->winx, 0.0, region->winy, 0.0, 1.0);
unit_m4(winmat);
instance_data->view = DRW_view_create(viewmat, winmat, nullptr, nullptr, nullptr);
}
void cache_populate()
{
IMAGE_InstanceData *instance_data = vedata->instance_data;
Main *bmain = CTX_data_main(draw_ctx->evil_C);
instance_data->image = space->get_image(bmain);
if (instance_data->image == nullptr) {
/* Early exit, nothing to draw. */
return;
}
instance_data->flags.do_tile_drawing = instance_data->image->source != IMA_SRC_TILED &&
space->use_tile_drawing();
void *lock;
ImBuf *image_buffer = space->acquire_image_buffer(instance_data->image, &lock);
/* Setup the matrix to go from screen UV coordinates to UV texture space coordinates. */
float image_resolution[2] = {image_buffer ? image_buffer->x : 1024.0f,
image_buffer ? image_buffer->y : 1024.0f};
space->init_ss_to_texture_matrix(
draw_ctx->region, image_resolution, instance_data->ss_to_texture);
const Scene *scene = DRW_context_state_get()->scene;
instance_data->sh_params.update(space.get(), scene, instance_data->image, image_buffer);
space->release_buffer(instance_data->image, image_buffer, lock);
ImageUser *iuser = space->get_image_user();
BKE_image_multiview_index(instance_data->image, iuser);
drawing_mode.cache_image(vedata, instance_data->image, iuser);
}
void draw_finish()
{
drawing_mode.draw_finish(vedata);
IMAGE_InstanceData *instance_data = vedata->instance_data;
instance_data->image = nullptr;
}
void draw_scene()
{
drawing_mode.draw_scene(vedata);
}
}; // namespace blender::draw::image_engine
/* -------------------------------------------------------------------- */
/** \name Engine Callbacks
* \{ */
static void IMAGE_engine_init(void *ved)
{
IMAGE_Data *vedata = (IMAGE_Data *)ved;
if (vedata->instance_data == nullptr) {
vedata->instance_data = MEM_new<IMAGE_InstanceData>(__func__);
}
}
static void IMAGE_cache_init(void *vedata)
{
const DRWContextState *draw_ctx = DRW_context_state_get();
ImageEngine image_engine(draw_ctx, static_cast<IMAGE_Data *>(vedata));
image_engine.cache_init();
image_engine.cache_populate();
}
static void IMAGE_cache_populate(void *UNUSED(vedata), Object *UNUSED(ob))
{
/* Function intentional left empty. `cache_populate` is required to be implemented. */
}
static void IMAGE_draw_scene(void *vedata)
{
const DRWContextState *draw_ctx = DRW_context_state_get();
ImageEngine image_engine(draw_ctx, static_cast<IMAGE_Data *>(vedata));
image_engine.draw_scene();
image_engine.draw_finish();
}
static void IMAGE_engine_free()
{
IMAGE_shader_free();
}
static void IMAGE_instance_free(void *_instance_data)
{
IMAGE_InstanceData *instance_data = reinterpret_cast<IMAGE_InstanceData *>(_instance_data);
MEM_delete(instance_data);
}
/** \} */
static const DrawEngineDataSize IMAGE_data_size = DRW_VIEWPORT_DATA_SIZE(IMAGE_Data);
} // namespace blender::draw::image_engine
extern "C" {
using namespace blender::draw::image_engine;
DrawEngineType draw_engine_image_type = {
nullptr, /* next */
nullptr, /* prev */
N_("UV/Image"), /* idname */
&IMAGE_data_size, /* vedata_size */
&IMAGE_engine_init, /* engine_init */
&IMAGE_engine_free, /* engine_free */
&IMAGE_instance_free, /* instance_free */
&IMAGE_cache_init, /* cache_init */
&IMAGE_cache_populate, /* cache_populate */
nullptr, /* cache_finish */
&IMAGE_draw_scene, /* draw_scene */
nullptr, /* view_update */
nullptr, /* id_update */
nullptr, /* render_to_image */
nullptr, /* store_metadata */
};
}
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