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blender/source/blender/draw/engines/select/select_engine.c

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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 2019, Blender Foundation.
*/
/** \file
* \ingroup draw_engine
*
* Engine for drawing a selection map where the pixels indicate the selection indices.
*/
#include "BLI_rect.h"
#include "BKE_editmesh.h"
#include "DNA_mesh_types.h"
#include "DNA_screen_types.h"
#include "ED_view3d.h"
#include "GPU_shader.h"
#include "GPU_select.h"
#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"
#include "UI_resources.h"
#include "DRW_engine.h"
#include "DRW_render.h"
#include "draw_cache_impl.h"
#include "select_engine.h"
/* Shaders */
#define SELECT_ENGINE "SELECT_ENGINE"
/* *********** LISTS *********** */
/* GPUViewport.storage
* Is freed everytime the viewport engine changes */
typedef struct SELECTID_StorageList {
struct SELECTID_PrivateData *g_data;
} SELECTID_StorageList;
typedef struct SELECTID_PassList {
struct DRWPass *select_id_face_pass;
struct DRWPass *select_id_edge_pass;
struct DRWPass *select_id_vert_pass;
} SELECTID_PassList;
typedef struct SELECTID_Data {
void *engine_type;
DRWViewportEmptyList *fbl;
DRWViewportEmptyList *txl;
SELECTID_PassList *psl;
SELECTID_StorageList *stl;
} SELECTID_Data;
typedef struct SELECTID_Shaders {
/* Depth Pre Pass */
struct GPUShader *select_id_flat;
struct GPUShader *select_id_uniform;
} SELECTID_Shaders;
/* *********** STATIC *********** */
static struct {
SELECTID_Shaders sh_data[GPU_SHADER_CFG_LEN];
struct GPUFrameBuffer *framebuffer_select_id;
struct GPUTexture *texture_u32;
struct {
struct BaseOffset *base_array_index_offsets;
uint bases_len;
uint last_base_drawn;
/** Total number of items `base_array_index_offsets[bases_len - 1].vert`. */
uint last_index_drawn;
struct Depsgraph *depsgraph;
short select_mode;
} context;
} e_data = {{{NULL}}}; /* Engine data */
typedef struct SELECTID_PrivateData {
DRWShadingGroup *shgrp_face_unif;
DRWShadingGroup *shgrp_face_flat;
DRWShadingGroup *shgrp_edge;
DRWShadingGroup *shgrp_vert;
DRWView *view_faces;
DRWView *view_edges;
DRWView *view_verts;
} SELECTID_PrivateData; /* Transient data */
struct BaseOffset {
/* For convenience only. */
union {
uint offset;
uint face_start;
};
union {
uint face;
uint edge_start;
};
union {
uint edge;
uint vert_start;
};
uint vert;
};
/* Shaders */
extern char datatoc_common_view_lib_glsl[];
extern char datatoc_selection_id_3D_vert_glsl[];
extern char datatoc_selection_id_frag_glsl[];
/* -------------------------------------------------------------------- */
/** \name Selection Utilities
* \{ */
static void draw_select_framebuffer_select_id_setup(void)
{
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
int size[2];
size[0] = GPU_texture_width(dtxl->depth);
size[1] = GPU_texture_height(dtxl->depth);
if (e_data.framebuffer_select_id == NULL) {
e_data.framebuffer_select_id = GPU_framebuffer_create();
}
if ((e_data.texture_u32 != NULL) && ((GPU_texture_width(e_data.texture_u32) != size[0]) ||
(GPU_texture_height(e_data.texture_u32) != size[1]))) {
GPU_texture_free(e_data.texture_u32);
e_data.texture_u32 = NULL;
}
if (e_data.texture_u32 == NULL) {
e_data.texture_u32 = GPU_texture_create_2d(size[0], size[1], GPU_R32UI, NULL, NULL);
GPU_framebuffer_texture_attach(e_data.framebuffer_select_id, dtxl->depth, 0, 0);
GPU_framebuffer_texture_attach(e_data.framebuffer_select_id, e_data.texture_u32, 0, 0);
GPU_framebuffer_check_valid(e_data.framebuffer_select_id, NULL);
}
}
static void draw_select_id_object(void *vedata,
Object *ob,
short select_mode,
bool draw_facedot,
uint initial_offset,
uint *r_vert_offset,
uint *r_edge_offset,
uint *r_face_offset)
{
SELECTID_StorageList *stl = ((SELECTID_Data *)vedata)->stl;
BLI_assert(initial_offset > 0);
switch (ob->type) {
case OB_MESH:
if (ob->mode & OB_MODE_EDIT) {
Mesh *me = ob->data;
BMEditMesh *em = me->edit_mesh;
const bool use_faceselect = (select_mode & SCE_SELECT_FACE) != 0;
DRW_mesh_batch_cache_validate(me);
BM_mesh_elem_table_ensure(em->bm, BM_VERT | BM_EDGE | BM_FACE);
struct GPUBatch *geom_faces, *geom_edges, *geom_verts, *geom_facedots;
geom_faces = DRW_mesh_batch_cache_get_triangles_with_select_id(me);
if (select_mode & SCE_SELECT_EDGE) {
geom_edges = DRW_mesh_batch_cache_get_edges_with_select_id(me);
}
if (select_mode & SCE_SELECT_VERTEX) {
geom_verts = DRW_mesh_batch_cache_get_verts_with_select_id(me);
}
if (use_faceselect && draw_facedot) {
geom_facedots = DRW_mesh_batch_cache_get_facedots_with_select_id(me);
}
DRWShadingGroup *face_shgrp;
if (use_faceselect) {
face_shgrp = DRW_shgroup_create_sub(stl->g_data->shgrp_face_flat);
DRW_shgroup_uniform_int_copy(face_shgrp, "offset", *(int *)&initial_offset);
if (draw_facedot) {
DRW_shgroup_call(face_shgrp, geom_facedots, ob);
}
*r_face_offset = initial_offset + em->bm->totface;
}
else {
face_shgrp = DRW_shgroup_create_sub(stl->g_data->shgrp_face_unif);
DRW_shgroup_uniform_int_copy(face_shgrp, "id", 0);
*r_face_offset = initial_offset;
}
DRW_shgroup_call(face_shgrp, geom_faces, ob);
/* Unlike faces, only draw edges if edge select mode. */
if (select_mode & SCE_SELECT_EDGE) {
DRWShadingGroup *edge_shgrp = DRW_shgroup_create_sub(stl->g_data->shgrp_edge);
DRW_shgroup_uniform_int_copy(edge_shgrp, "offset", *(int *)r_face_offset);
DRW_shgroup_call(edge_shgrp, geom_edges, ob);
*r_edge_offset = *r_face_offset + em->bm->totedge;
}
else {
/* Note that `r_vert_offset` is calculated from `r_edge_offset`.
* Otherwise the first vertex is never selected, see: T53512. */
*r_edge_offset = *r_face_offset;
}
/* Unlike faces, only verts if vert select mode. */
if (select_mode & SCE_SELECT_VERTEX) {
DRWShadingGroup *vert_shgrp = DRW_shgroup_create_sub(stl->g_data->shgrp_vert);
DRW_shgroup_uniform_int_copy(vert_shgrp, "offset", *(int *)r_edge_offset);
DRW_shgroup_call(vert_shgrp, geom_verts, ob);
*r_vert_offset = *r_edge_offset + em->bm->totvert;
}
else {
*r_vert_offset = *r_edge_offset;
}
}
else {
Mesh *me_orig = DEG_get_original_object(ob)->data;
Mesh *me_eval = ob->data;
struct GPUBatch *geom_faces = DRW_mesh_batch_cache_get_triangles_with_select_id(me_eval);
if ((me_orig->editflag & ME_EDIT_PAINT_VERT_SEL) &&
/* Currently vertex select supports weight paint and vertex paint. */
((ob->mode & OB_MODE_WEIGHT_PAINT) || (ob->mode & OB_MODE_VERTEX_PAINT))) {
struct GPUBatch *geom_verts = DRW_mesh_batch_cache_get_verts_with_select_id(me_eval);
/* Only draw faces to mask out verts, we don't want their selection ID's. */
DRWShadingGroup *face_shgrp = DRW_shgroup_create_sub(stl->g_data->shgrp_face_unif);
DRW_shgroup_uniform_int_copy(face_shgrp, "id", 0);
DRW_shgroup_call(face_shgrp, geom_faces, ob);
DRWShadingGroup *vert_shgrp = DRW_shgroup_create_sub(stl->g_data->shgrp_vert);
DRW_shgroup_uniform_int_copy(vert_shgrp, "offset", 1);
DRW_shgroup_call(vert_shgrp, geom_verts, ob);
*r_face_offset = *r_edge_offset = initial_offset;
*r_vert_offset = me_eval->totvert + 1;
}
else {
DRWShadingGroup *face_shgrp = DRW_shgroup_create_sub(stl->g_data->shgrp_face_flat);
DRW_shgroup_uniform_int_copy(face_shgrp, "offset", *(int *)&initial_offset);
DRW_shgroup_call(face_shgrp, geom_faces, ob);
*r_face_offset = initial_offset + me_eval->totpoly;
*r_edge_offset = *r_vert_offset = *r_face_offset;
}
}
break;
case OB_CURVE:
case OB_SURF:
break;
}
}
static bool check_ob_drawface_dot(short select_mode, const View3D *v3d, char dt)
{
if (select_mode & SCE_SELECT_FACE) {
if ((dt < OB_SOLID) || XRAY_FLAG_ENABLED(v3d)) {
return true;
}
if (v3d->overlay.edit_flag & V3D_OVERLAY_EDIT_FACE_DOT) {
return true;
}
if ((v3d->overlay.edit_flag & V3D_OVERLAY_EDIT_EDGES) == 0) {
/* Since we can't deduce face selection when edges aren't visible - show dots. */
return true;
}
}
return false;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Engine Functions
* \{ */
static void select_engine_init(void *vedata)
{
const DRWContextState *draw_ctx = DRW_context_state_get();
eGPUShaderConfig sh_cfg = draw_ctx->sh_cfg;
SELECTID_StorageList *stl = ((SELECTID_Data *)vedata)->stl;
SELECTID_Shaders *sh_data = &e_data.sh_data[sh_cfg];
/* Prepass */
if (!sh_data->select_id_flat) {
const GPUShaderConfigData *sh_cfg_data = &GPU_shader_cfg_data[sh_cfg];
sh_data->select_id_flat = GPU_shader_create_from_arrays({
.vert = (const char *[]){sh_cfg_data->lib,
datatoc_common_view_lib_glsl,
datatoc_selection_id_3D_vert_glsl,
NULL},
.frag = (const char *[]){datatoc_selection_id_frag_glsl, NULL},
.defs = (const char *[]){sh_cfg_data->def, NULL},
});
}
if (!sh_data->select_id_uniform) {
const GPUShaderConfigData *sh_cfg_data = &GPU_shader_cfg_data[sh_cfg];
sh_data->select_id_uniform = GPU_shader_create_from_arrays({
.vert = (const char *[]){sh_cfg_data->lib,
datatoc_common_view_lib_glsl,
datatoc_selection_id_3D_vert_glsl,
NULL},
.frag = (const char *[]){datatoc_selection_id_frag_glsl, NULL},
.defs = (const char *[]){sh_cfg_data->def, "#define UNIFORM_ID\n", NULL},
});
}
if (!stl->g_data) {
/* Alloc transient pointers */
stl->g_data = MEM_mallocN(sizeof(*stl->g_data), __func__);
}
{
/* Create view with depth offset */
stl->g_data->view_faces = (DRWView *)DRW_view_default_get();
stl->g_data->view_edges = DRW_view_create_with_zoffset(draw_ctx->rv3d, 1.0f);
stl->g_data->view_verts = DRW_view_create_with_zoffset(draw_ctx->rv3d, 1.1f);
}
}
static void select_cache_init(void *vedata)
{
SELECTID_PassList *psl = ((SELECTID_Data *)vedata)->psl;
SELECTID_StorageList *stl = ((SELECTID_Data *)vedata)->stl;
const DRWContextState *draw_ctx = DRW_context_state_get();
SELECTID_Shaders *sh_data = &e_data.sh_data[draw_ctx->sh_cfg];
{
psl->select_id_face_pass = DRW_pass_create("Face Pass", DRW_STATE_DEFAULT);
stl->g_data->shgrp_face_unif = DRW_shgroup_create(sh_data->select_id_uniform,
psl->select_id_face_pass);
stl->g_data->shgrp_face_flat = DRW_shgroup_create(sh_data->select_id_flat,
psl->select_id_face_pass);
psl->select_id_edge_pass = DRW_pass_create(
"Edge Pass", DRW_STATE_DEFAULT | DRW_STATE_FIRST_VERTEX_CONVENTION);
stl->g_data->shgrp_edge = DRW_shgroup_create(sh_data->select_id_flat,
psl->select_id_edge_pass);
psl->select_id_vert_pass = DRW_pass_create("Vert Pass", DRW_STATE_DEFAULT);
stl->g_data->shgrp_vert = DRW_shgroup_create(sh_data->select_id_flat,
psl->select_id_vert_pass);
DRW_shgroup_uniform_float_copy(stl->g_data->shgrp_vert, "sizeVertex", G_draw.block.sizeVertex);
if (draw_ctx->sh_cfg == GPU_SHADER_CFG_CLIPPED) {
DRW_shgroup_state_enable(stl->g_data->shgrp_face_unif, DRW_STATE_CLIP_PLANES);
DRW_shgroup_state_enable(stl->g_data->shgrp_face_flat, DRW_STATE_CLIP_PLANES);
DRW_shgroup_state_enable(stl->g_data->shgrp_edge, DRW_STATE_CLIP_PLANES);
DRW_shgroup_state_enable(stl->g_data->shgrp_vert, DRW_STATE_CLIP_PLANES);
}
}
e_data.context.last_base_drawn = 0;
e_data.context.last_index_drawn = 1;
}
static void select_cache_populate(void *vedata, Object *ob)
{
const DRWContextState *draw_ctx = DRW_context_state_get();
short select_mode = e_data.context.select_mode;
if (select_mode == -1) {
ToolSettings *ts = draw_ctx->scene->toolsettings;
select_mode = ts->selectmode;
}
bool draw_facedot = check_ob_drawface_dot(select_mode, draw_ctx->v3d, ob->dt);
struct BaseOffset *base_ofs =
&e_data.context.base_array_index_offsets[e_data.context.last_base_drawn++];
uint offset = e_data.context.last_index_drawn;
draw_select_id_object(vedata,
ob,
select_mode,
draw_facedot,
offset,
&base_ofs->vert,
&base_ofs->edge,
&base_ofs->face);
base_ofs->offset = offset;
e_data.context.last_index_drawn = base_ofs->vert;
}
static void select_draw_scene(void *vedata)
{
SELECTID_StorageList *stl = ((SELECTID_Data *)vedata)->stl;
SELECTID_PassList *psl = ((SELECTID_Data *)vedata)->psl;
/* Setup framebuffer */
draw_select_framebuffer_select_id_setup();
GPU_framebuffer_bind(e_data.framebuffer_select_id);
/* dithering and AA break color coding, so disable */
glDisable(GL_DITHER);
GPU_framebuffer_clear_color_depth(e_data.framebuffer_select_id, (const float[4]){0.0f}, 1.0f);
DRW_view_set_active(stl->g_data->view_faces);
DRW_draw_pass(psl->select_id_face_pass);
DRW_view_set_active(stl->g_data->view_edges);
DRW_draw_pass(psl->select_id_edge_pass);
DRW_view_set_active(stl->g_data->view_verts);
DRW_draw_pass(psl->select_id_vert_pass);
}
static void select_engine_free(void)
{
for (int sh_data_index = 0; sh_data_index < ARRAY_SIZE(e_data.sh_data); sh_data_index++) {
SELECTID_Shaders *sh_data = &e_data.sh_data[sh_data_index];
DRW_SHADER_FREE_SAFE(sh_data->select_id_flat);
DRW_SHADER_FREE_SAFE(sh_data->select_id_uniform);
}
DRW_TEXTURE_FREE_SAFE(e_data.texture_u32);
GPU_FRAMEBUFFER_FREE_SAFE(e_data.framebuffer_select_id);
MEM_SAFE_FREE(e_data.context.base_array_index_offsets);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Exposed `DRW_engine.h` functions
* \{ */
bool DRW_select_elem_get(const uint sel_id, uint *r_elem, uint *r_base_index, char *r_elem_type)
{
char elem_type = 0;
uint elem_id;
uint base_index = 0;
for (; base_index < e_data.context.bases_len; base_index++) {
struct BaseOffset *base_ofs = &e_data.context.base_array_index_offsets[base_index];
if (base_ofs->face > sel_id) {
elem_id = sel_id - base_ofs->face_start;
elem_type = SCE_SELECT_FACE;
break;
}
if (base_ofs->edge > sel_id) {
elem_id = sel_id - base_ofs->edge_start;
elem_type = SCE_SELECT_EDGE;
break;
}
if (base_ofs->vert > sel_id) {
elem_id = sel_id - base_ofs->vert_start;
elem_type = SCE_SELECT_VERTEX;
break;
}
}
if (base_index == e_data.context.bases_len) {
return false;
}
*r_elem = elem_id;
if (r_base_index) {
*r_base_index = base_index;
}
if (r_elem_type) {
*r_elem_type = elem_type;
}
return true;
}
uint DRW_select_context_offset_for_object_elem(const uint base_index, char elem_type)
{
struct BaseOffset *base_ofs = &e_data.context.base_array_index_offsets[base_index];
if (elem_type == SCE_SELECT_VERTEX) {
return base_ofs->vert_start - 1;
}
if (elem_type == SCE_SELECT_EDGE) {
return base_ofs->edge_start - 1;
}
if (elem_type == SCE_SELECT_FACE) {
return base_ofs->face_start - 1;
}
BLI_assert(0);
return 0;
}
uint DRW_select_context_elem_len(void)
{
return e_data.context.last_index_drawn;
}
/* Read a block of pixels from the select frame buffer. */
void DRW_framebuffer_select_id_read(const rcti *rect, uint *r_buf)
{
/* clamp rect by texture */
rcti r = {
.xmin = 0,
.xmax = GPU_texture_width(e_data.texture_u32),
.ymin = 0,
.ymax = GPU_texture_height(e_data.texture_u32),
};
rcti rect_clamp = *rect;
if (BLI_rcti_isect(&r, &rect_clamp, &rect_clamp)) {
DRW_opengl_context_enable();
GPU_framebuffer_bind(e_data.framebuffer_select_id);
glReadBuffer(GL_COLOR_ATTACHMENT0);
glReadPixels(rect_clamp.xmin,
rect_clamp.ymin,
BLI_rcti_size_x(&rect_clamp),
BLI_rcti_size_y(&rect_clamp),
GL_RED_INTEGER,
GL_UNSIGNED_INT,
r_buf);
GPU_framebuffer_restore();
DRW_opengl_context_disable();
if (!BLI_rcti_compare(rect, &rect_clamp)) {
GPU_select_buffer_stride_realign(rect, &rect_clamp, r_buf);
}
}
else {
size_t buf_size = BLI_rcti_size_x(rect) * BLI_rcti_size_y(rect) * sizeof(*r_buf);
memset(r_buf, 0, buf_size);
}
}
void DRW_select_context_create(Depsgraph *depsgraph,
Base **UNUSED(bases),
const uint bases_len,
short select_mode)
{
e_data.context.depsgraph = depsgraph;
e_data.context.select_mode = select_mode;
e_data.context.bases_len = bases_len;
MEM_SAFE_FREE(e_data.context.base_array_index_offsets);
e_data.context.base_array_index_offsets = MEM_mallocN(
sizeof(*e_data.context.base_array_index_offsets) * bases_len, __func__);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Legacy
* \{ */
void DRW_draw_select_id_object(Depsgraph *depsgraph,
ViewLayer *view_layer,
ARegion *ar,
View3D *v3d,
Object *ob,
short select_mode)
{
Base *base = BKE_view_layer_base_find(view_layer, ob);
DRW_draw_select_id(depsgraph, ar, v3d, &base, 1, select_mode);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Engine Type
* \{ */
static const DrawEngineDataSize select_data_size = DRW_VIEWPORT_DATA_SIZE(SELECTID_Data);
DrawEngineType draw_engine_select_type = {
NULL,
NULL,
N_("Select ID"),
&select_data_size,
&select_engine_init,
&select_engine_free,
&select_cache_init,
&select_cache_populate,
NULL,
NULL,
&select_draw_scene,
NULL,
NULL,
NULL,
};
/* Note: currently unused, we may want to register so we can see this when debugging the view. */
RenderEngineType DRW_engine_viewport_select_type = {
NULL,
NULL,
SELECT_ENGINE,
N_("Select ID"),
RE_INTERNAL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
&draw_engine_select_type,
{NULL, NULL, NULL},
};
/** \} */
#undef SELECT_ENGINE
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