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|
/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* The Original Code is Copyright (C) 2017 Blender Foundation.
* All rights reserved.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/gpu/intern/gpu_select_pick.c
* \ingroup gpu
*
* Custom select code for picking small regions (not efficient for large regions).
* `gpu_select_pick_*` API.
*/
#include <string.h>
#include <stdlib.h>
#include <float.h>
#include "GPU_immediate.h"
#include "GPU_draw.h"
#include "GPU_select.h"
#include "GPU_extensions.h"
#include "GPU_glew.h"
#include "MEM_guardedalloc.h"
#include "BLI_rect.h"
#include "BLI_listbase.h"
#include "BLI_math_vector.h"
#include "BLI_utildefines.h"
#include "gpu_select_private.h"
#include "BLI_strict_flags.h"
/* #define DEBUG_PRINT */
/* Alloc number for depths */
#define ALLOC_DEPTHS 200
/* Z-depth of cleared depth buffer */
#define DEPTH_MAX 0xffffffff
/* ----------------------------------------------------------------------------
* SubRectStride
*/
/* For looping over a sub-region of a rect, could be moved into 'rct.c'*/
typedef struct SubRectStride {
unsigned int start; /* start here */
unsigned int span; /* read these */
unsigned int span_len; /* len times (read span 'len' times). */
unsigned int skip; /* skip those */
} SubRectStride;
/* we may want to change back to float if uint isn't well supported */
typedef unsigned int depth_t;
/**
* Calculate values needed for looping over a sub-region (smaller buffer within a larger buffer).
*
* 'src' must be bigger than 'dst'.
*/
static void rect_subregion_stride_calc(const rcti *src, const rcti *dst, SubRectStride *r_sub)
{
const int src_x = BLI_rcti_size_x(src);
// const int src_y = BLI_rcti_size_y(src);
const int dst_x = BLI_rcti_size_x(dst);
const int dst_y = BLI_rcti_size_y(dst);
const int x = dst->xmin - src->xmin;
const int y = dst->ymin - src->ymin;
BLI_assert(src->xmin <= dst->xmin && src->ymin <= dst->ymin &&
src->ymax >= dst->ymax && src->ymax >= dst->ymax);
BLI_assert(x >= 0 && y >= 0);
r_sub->start = (unsigned int)((src_x * y) + x);
r_sub->span = (unsigned int)dst_x;
r_sub->span_len = (unsigned int)dst_y;
r_sub->skip = (unsigned int)(src_x - dst_x);
}
/**
* Ignore depth clearing as a change,
* only check if its been changed _and_ filled in (ignore clearing since XRAY does this).
*/
BLI_INLINE bool depth_is_filled(const depth_t *prev, const depth_t *curr)
{
return (*prev != *curr) && (*curr != DEPTH_MAX);
}
/* ----------------------------------------------------------------------------
* DepthBufCache
*
* Result of reading glReadPixels,
* use for both cache and non-cached storage.
*/
/* store result of glReadPixels */
typedef struct DepthBufCache {
struct DepthBufCache *next, *prev;
unsigned int id;
depth_t buf[0];
} DepthBufCache;
static DepthBufCache *depth_buf_malloc(unsigned int rect_len)
{
DepthBufCache *rect = MEM_mallocN(sizeof(DepthBufCache) + sizeof(depth_t) * rect_len, __func__);
rect->id = SELECT_ID_NONE;
return rect;
}
static bool depth_buf_rect_depth_any(
const DepthBufCache *rect_depth,
unsigned int rect_len)
{
const depth_t *curr = rect_depth->buf;
for (unsigned int i = 0; i < rect_len; i++, curr++) {
if (*curr != DEPTH_MAX) {
return true;
}
}
return false;
}
static bool depth_buf_subrect_depth_any(
const DepthBufCache *rect_depth,
const SubRectStride *sub_rect)
{
const depth_t *curr = rect_depth->buf + sub_rect->start;
for (unsigned int i = 0; i < sub_rect->span_len; i++) {
const depth_t *curr_end = curr + sub_rect->span;
for (; curr < curr_end; curr++, curr++) {
if (*curr != DEPTH_MAX) {
return true;
}
}
curr += sub_rect->skip;
}
return false;
}
static bool depth_buf_rect_depth_any_filled(
const DepthBufCache *rect_prev, const DepthBufCache *rect_curr,
unsigned int rect_len)
{
#if 0
return memcmp(rect_depth_a->buf, rect_depth_b->buf, rect_len * sizeof(depth_t)) != 0;
#else
const depth_t *prev = rect_prev->buf;
const depth_t *curr = rect_curr->buf;
for (unsigned int i = 0; i < rect_len; i++, curr++, prev++) {
if (depth_is_filled(prev, curr)) {
return true;
}
}
return false;
#endif
}
/**
* Both buffers are the same size, just check if the sub-rect contains any differences.
*/
static bool depth_buf_subrect_depth_any_filled(
const DepthBufCache *rect_src, const DepthBufCache *rect_dst,
const SubRectStride *sub_rect)
{
/* same as above but different rect sizes */
const depth_t *prev = rect_src->buf + sub_rect->start;
const depth_t *curr = rect_dst->buf + sub_rect->start;
for (unsigned int i = 0; i < sub_rect->span_len; i++) {
const depth_t *curr_end = curr + sub_rect->span;
for (; curr < curr_end; prev++, curr++) {
if (depth_is_filled(prev, curr)) {
return true;
}
}
prev += sub_rect->skip;
curr += sub_rect->skip;
}
return false;
}
/* ----------------------------------------------------------------------------
* DepthID
*
* Internal structure for storing hits.
*/
typedef struct DepthID {
unsigned int id;
depth_t depth;
} DepthID;
static int depth_id_cmp(const void *v1, const void *v2)
{
const DepthID *d1 = v1, *d2 = v2;
if (d1->id < d2->id) {
return -1;
}
else if (d1->id > d2->id) {
return 1;
}
else {
return 0;
}
}
static int depth_cmp(const void *v1, const void *v2)
{
const DepthID *d1 = v1, *d2 = v2;
if (d1->depth < d2->depth) {
return -1;
}
else if (d1->depth > d2->depth) {
return 1;
}
else {
return 0;
}
}
/* depth sorting */
typedef struct GPUPickState {
/* cache on initialization */
unsigned int (*buffer)[4];
/* buffer size (stores number of integers, for actual size multiply by sizeof integer)*/
unsigned int bufsize;
/* mode of operation */
char mode;
/* OpenGL drawing, never use when (is_cached == true). */
struct {
/* The current depth, accumulated as we draw */
DepthBufCache *rect_depth;
/* Scratch buffer, avoid allocs every time (when not caching) */
DepthBufCache *rect_depth_test;
/* Pass to glReadPixels (x, y, w, h) */
int clip_readpixels[4];
/* Set after first draw */
bool is_init;
unsigned int prev_id;
} gl;
/* src: data stored in 'cache' and 'gl',
* dst: use when cached region is smaller (where src -> dst isn't 1:1) */
struct {
rcti clip_rect;
unsigned int rect_len;
} src, dst;
/* Store cache between `GPU_select_cache_begin/end` */
bool use_cache;
bool is_cached;
struct {
/* Cleanup used for iterating over both source and destination buffers:
* src.clip_rect -> dst.clip_rect */
SubRectStride sub_rect;
/* List of DepthBufCache, sized of 'src.clip_rect' */
ListBase bufs;
} cache;
/* Pickign methods */
union {
/* GPU_SELECT_PICK_ALL */
struct {
DepthID *hits;
unsigned int hits_len;
unsigned int hits_len_alloc;
} all;
/* GPU_SELECT_PICK_NEAREST */
struct {
unsigned int *rect_id;
} nearest;
};
} GPUPickState;
static GPUPickState g_pick_state = {0};
void gpu_select_pick_begin(
unsigned int (*buffer)[4], unsigned int bufsize,
const rcti *input, char mode)
{
GPUPickState *ps = &g_pick_state;
#ifdef DEBUG_PRINT
printf("%s: mode=%d, use_cache=%d, is_cache=%d\n", __func__, mode, ps->use_cache, ps->is_cached);
#endif
ps->bufsize = bufsize;
ps->buffer = buffer;
ps->mode = mode;
const unsigned int rect_len = (unsigned int)(BLI_rcti_size_x(input) * BLI_rcti_size_y(input));
ps->dst.clip_rect = *input;
ps->dst.rect_len = rect_len;
/* Restrict OpenGL operations for when we don't have cache */
if (ps->is_cached == false) {
gpuPushAttrib(GPU_DEPTH_BUFFER_BIT | GPU_VIEWPORT_BIT);
/* disable writing to the framebuffer */
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
if (mode == GPU_SELECT_PICK_ALL) {
glDepthFunc(GL_ALWAYS);
}
else {
glDepthFunc(GL_LEQUAL);
}
float viewport[4];
glGetFloatv(GL_SCISSOR_BOX, viewport);
ps->src.clip_rect = *input;
ps->src.rect_len = rect_len;
ps->gl.clip_readpixels[0] = (int)viewport[0];
ps->gl.clip_readpixels[1] = (int)viewport[1];
ps->gl.clip_readpixels[2] = BLI_rcti_size_x(&ps->src.clip_rect);
ps->gl.clip_readpixels[3] = BLI_rcti_size_y(&ps->src.clip_rect);
glViewport(UNPACK4(ps->gl.clip_readpixels));
/* It's possible we don't want to clear depth buffer,
* so existing elements are masked by current z-buffer. */
glClear(GL_DEPTH_BUFFER_BIT);
/* scratch buffer (read new values here) */
ps->gl.rect_depth_test = depth_buf_malloc(rect_len);
ps->gl.rect_depth = depth_buf_malloc(rect_len);
/* set initial 'far' value */
#if 0
glReadPixels(UNPACK4(ps->gl.clip_readpixels), GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, ps->gl.rect_depth->buf);
#else
for (unsigned int i = 0; i < rect_len; i++) {
ps->gl.rect_depth->buf[i] = DEPTH_MAX;
}
#endif
ps->gl.is_init = false;
ps->gl.prev_id = 0;
}
else {
/* Using cache (ps->is_cached == true) */
/* src.clip_rect -> dst.clip_rect */
rect_subregion_stride_calc(&ps->src.clip_rect, &ps->dst.clip_rect, &ps->cache.sub_rect);
BLI_assert(ps->gl.rect_depth == NULL);
BLI_assert(ps->gl.rect_depth_test == NULL);
}
if (mode == GPU_SELECT_PICK_ALL) {
ps->all.hits = MEM_mallocN(sizeof(*ps->all.hits) * ALLOC_DEPTHS, __func__);
ps->all.hits_len = 0;
ps->all.hits_len_alloc = ALLOC_DEPTHS;
}
else {
/* Set to 0xff for SELECT_ID_NONE */
ps->nearest.rect_id = MEM_mallocN(sizeof(unsigned int) * ps->dst.rect_len, __func__);
memset(ps->nearest.rect_id, 0xff, sizeof(unsigned int) * ps->dst.rect_len);
}
}
/**
* Given 2x depths, we know are different - update the depth information
* use for both cached/uncached depth buffers.
*/
static void gpu_select_load_id_pass_all(const DepthBufCache *rect_curr)
{
GPUPickState *ps = &g_pick_state;
const unsigned int id = rect_curr->id;
/* find the best depth for this pass and store in 'all.hits' */
depth_t depth_best = DEPTH_MAX;
#define EVAL_TEST() \
if (depth_best > *curr) { \
depth_best = *curr; \
} ((void)0)
if (ps->is_cached == false) {
const depth_t *curr = rect_curr->buf;
BLI_assert(ps->src.rect_len == ps->dst.rect_len);
const unsigned int rect_len = ps->src.rect_len;
for (unsigned int i = 0; i < rect_len; i++, curr++) {
EVAL_TEST();
}
}
else {
/* same as above but different rect sizes */
const depth_t *curr = rect_curr->buf + ps->cache.sub_rect.start;
for (unsigned int i = 0; i < ps->cache.sub_rect.span_len; i++) {
const depth_t *curr_end = curr + ps->cache.sub_rect.span;
for (; curr < curr_end; curr++) {
EVAL_TEST();
}
curr += ps->cache.sub_rect.skip;
}
}
#undef EVAL_TEST
/* ensure enough space */
if (UNLIKELY(ps->all.hits_len == ps->all.hits_len_alloc)) {
ps->all.hits_len_alloc += ALLOC_DEPTHS;
ps->all.hits = MEM_reallocN(ps->all.hits, ps->all.hits_len_alloc * sizeof(*ps->all.hits));
}
DepthID *d = &ps->all.hits[ps->all.hits_len++];
d->id = id;
d->depth = depth_best;
}
static void gpu_select_load_id_pass_nearest(const DepthBufCache *rect_prev, const DepthBufCache *rect_curr)
{
GPUPickState *ps = &g_pick_state;
const unsigned int id = rect_curr->id;
/* keep track each pixels ID in 'nearest.rect_id' */
if (id != SELECT_ID_NONE) {
unsigned int *id_ptr = ps->nearest.rect_id;
/* Check against DEPTH_MAX because XRAY will clear the buffer,
* so previously set values will become unset.
* In this case just leave those id's left as-is. */
#define EVAL_TEST() \
if (depth_is_filled(prev, curr)) { \
*id_ptr = id; \
} ((void)0)
if (ps->is_cached == false) {
const depth_t *prev = rect_prev->buf;
const depth_t *curr = rect_curr->buf;
BLI_assert(ps->src.rect_len == ps->dst.rect_len);
const unsigned int rect_len = ps->src.rect_len;
for (unsigned int i = 0; i < rect_len; i++, curr++, prev++, id_ptr++) {
EVAL_TEST();
}
}
else {
/* same as above but different rect sizes */
const depth_t *prev = rect_prev->buf + ps->cache.sub_rect.start;
const depth_t *curr = rect_curr->buf + ps->cache.sub_rect.start;
for (unsigned int i = 0; i < ps->cache.sub_rect.span_len; i++) {
const depth_t *curr_end = curr + ps->cache.sub_rect.span;
for (; curr < curr_end; prev++, curr++, id_ptr++) {
EVAL_TEST();
}
prev += ps->cache.sub_rect.skip;
curr += ps->cache.sub_rect.skip;
}
}
#undef EVAL_TEST
}
}
bool gpu_select_pick_load_id(unsigned int id)
{
GPUPickState *ps = &g_pick_state;
if (ps->gl.is_init) {
const unsigned int rect_len = ps->src.rect_len;
glReadPixels(UNPACK4(ps->gl.clip_readpixels), GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, ps->gl.rect_depth_test->buf);
/* perform initial check since most cases the array remains unchanged */
bool do_pass = false;
if (g_pick_state.mode == GPU_SELECT_PICK_ALL) {
if (depth_buf_rect_depth_any(ps->gl.rect_depth_test, rect_len)) {
ps->gl.rect_depth_test->id = ps->gl.prev_id;
gpu_select_load_id_pass_all(ps->gl.rect_depth_test);
do_pass = true;
}
}
else {
if (depth_buf_rect_depth_any_filled(ps->gl.rect_depth, ps->gl.rect_depth_test, rect_len)) {
ps->gl.rect_depth_test->id = ps->gl.prev_id;
gpu_select_load_id_pass_nearest(ps->gl.rect_depth, ps->gl.rect_depth_test);
do_pass = true;
}
}
if (do_pass) {
/* Store depth in cache */
if (ps->use_cache) {
BLI_addtail(&ps->cache.bufs, ps->gl.rect_depth);
ps->gl.rect_depth = depth_buf_malloc(ps->src.rect_len);
}
SWAP(DepthBufCache *, ps->gl.rect_depth, ps->gl.rect_depth_test);
if (g_pick_state.mode == GPU_SELECT_PICK_ALL) {
/* we want new depths every time */
glClear(GL_DEPTH_BUFFER_BIT);
}
}
}
ps->gl.is_init = true;
ps->gl.prev_id = id;
return true;
}
/**
* (Optional), call before 'gpu_select_pick_end' if GL context is not kept.
* is not compatible with regular select case.
* */
void gpu_select_pick_finalize(void)
{
GPUPickState *ps = &g_pick_state;
if (ps->gl.is_init) {
/* force finishing last pass */
gpu_select_pick_load_id(ps->gl.prev_id);
}
}
unsigned int gpu_select_pick_end(void)
{
GPUPickState *ps = &g_pick_state;
#ifdef DEBUG_PRINT
printf("%s\n", __func__);
#endif
if (ps->is_cached == false) {
gpu_select_pick_finalize();
gpuPopAttrib();
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
}
/* assign but never free directly since it may be in cache */
DepthBufCache *rect_depth_final;
/* Store depth in cache */
if (ps->use_cache && !ps->is_cached) {
BLI_addtail(&ps->cache.bufs, ps->gl.rect_depth);
ps->gl.rect_depth = NULL;
rect_depth_final = ps->cache.bufs.last;
}
else if (ps->is_cached) {
rect_depth_final = ps->cache.bufs.last;
}
else {
/* common case, no cache */
rect_depth_final = ps->gl.rect_depth;
}
unsigned int maxhits = g_pick_state.bufsize;
DepthID *depth_data;
unsigned int depth_data_len = 0;
if (g_pick_state.mode == GPU_SELECT_PICK_ALL) {
depth_data = ps->all.hits;
depth_data_len = ps->all.hits_len;
/* move ownership */
ps->all.hits = NULL;
ps->all.hits_len = 0;
ps->all.hits_len_alloc = 0;
}
else {
/* GPU_SELECT_PICK_NEAREST */
/* Over alloc (unlikely we have as many depths as pixels) */
unsigned int depth_data_len_first_pass = 0;
depth_data = MEM_mallocN(ps->dst.rect_len * sizeof(*depth_data), __func__);
/* Partially de-duplicating copy,
* when contiguous ID's are found - update their closest depth.
* This isn't essential but means there is less data to sort. */
#define EVAL_TEST(i_src, i_dst) \
{ \
const unsigned int id = ps->nearest.rect_id[i_dst]; \
if (id != SELECT_ID_NONE) { \
const depth_t depth = rect_depth_final->buf[i_src]; \
if (depth_last == NULL || depth_last->id != id) { \
DepthID *d = &depth_data[depth_data_len_first_pass++]; \
d->id = id; \
d->depth = depth; \
} \
else if (depth_last->depth > depth) { \
depth_last->depth = depth; \
} \
} \
} ((void)0)
{
DepthID *depth_last = NULL;
if (ps->is_cached == false) {
for (unsigned int i = 0; i < ps->src.rect_len; i++) {
EVAL_TEST(i, i);
}
}
else {
/* same as above but different rect sizes */
unsigned int i_src = ps->cache.sub_rect.start, i_dst = 0;
for (unsigned int j = 0; j < ps->cache.sub_rect.span_len; j++) {
const unsigned int i_src_end = i_src + ps->cache.sub_rect.span;
for (; i_src < i_src_end; i_src++, i_dst++) {
EVAL_TEST(i_src, i_dst);
}
i_src += ps->cache.sub_rect.skip;
}
}
}
#undef EVAL_TEST
qsort(depth_data, depth_data_len_first_pass, sizeof(DepthID), depth_id_cmp);
/* Sort by ID's then keep the best depth for each ID */
depth_data_len = 0;
{
DepthID *depth_last = NULL;
for (unsigned int i = 0; i < depth_data_len_first_pass; i++) {
if (depth_last == NULL || depth_last->id != depth_data[i].id) {
depth_last = &depth_data[depth_data_len++];
*depth_last = depth_data[i];
}
else if (depth_last->depth > depth_data[i].depth) {
depth_last->depth = depth_data[i].depth;
}
}
}
}
/* Finally sort each unique (id, depth) pair by depth
* so the final hit-list is sorted by depth (nearest first) */
unsigned int hits = 0;
if (depth_data_len > maxhits) {
hits = (unsigned int)-1;
}
else {
/* leave sorting up to the caller */
qsort(depth_data, depth_data_len, sizeof(DepthID), depth_cmp);
for (unsigned int i = 0; i < depth_data_len; i++) {
#ifdef DEBUG_PRINT
printf(" hit: %u: depth %u\n", depth_data[i].id, depth_data[i].depth);
#endif
/* first 3 are dummy values */
g_pick_state.buffer[hits][0] = 1;
g_pick_state.buffer[hits][1] = 0x0; /* depth_data[i].depth; */ /* unused */
g_pick_state.buffer[hits][2] = 0x0; /* z-far is currently never used. */
g_pick_state.buffer[hits][3] = depth_data[i].id;
hits++;
}
BLI_assert(hits < maxhits);
}
MEM_freeN(depth_data);
MEM_SAFE_FREE(ps->gl.rect_depth);
MEM_SAFE_FREE(ps->gl.rect_depth_test);
if (g_pick_state.mode == GPU_SELECT_PICK_ALL) {
/* 'hits' already freed as 'depth_data' */
}
else {
MEM_freeN(ps->nearest.rect_id);
ps->nearest.rect_id = NULL;
}
if (ps->use_cache) {
ps->is_cached = true;
}
return hits;
}
/* ----------------------------------------------------------------------------
* Caching
*
* Support multiple begin/end's reusing depth buffers.
*/
void gpu_select_pick_cache_begin(void)
{
BLI_assert(g_pick_state.use_cache == false);
#ifdef DEBUG_PRINT
printf("%s\n", __func__);
#endif
g_pick_state.use_cache = true;
g_pick_state.is_cached = false;
}
void gpu_select_pick_cache_end(void)
{
#ifdef DEBUG_PRINT
printf("%s: with %d buffers\n", __func__, BLI_listbase_count(&g_pick_state.cache.bufs));
#endif
g_pick_state.use_cache = false;
g_pick_state.is_cached = false;
BLI_freelistN(&g_pick_state.cache.bufs);
}
/* is drawing needed? */
bool gpu_select_pick_is_cached(void)
{
return g_pick_state.is_cached;
}
void gpu_select_pick_cache_load_id(void)
{
BLI_assert(g_pick_state.is_cached == true);
GPUPickState *ps = &g_pick_state;
#ifdef DEBUG_PRINT
printf("%s (building depth from cache)\n", __func__);
#endif
for (DepthBufCache *rect_depth = ps->cache.bufs.first; rect_depth; rect_depth = rect_depth->next) {
if (rect_depth->next != NULL) {
/* we know the buffers differ, but this sub-region may not.
* double check before adding an id-pass */
if (g_pick_state.mode == GPU_SELECT_PICK_ALL) {
if (depth_buf_subrect_depth_any(rect_depth->next, &ps->cache.sub_rect)) {
gpu_select_load_id_pass_all(rect_depth->next);
}
}
else {
if (depth_buf_subrect_depth_any_filled(rect_depth, rect_depth->next, &ps->cache.sub_rect)) {
gpu_select_load_id_pass_nearest(rect_depth, rect_depth->next);
}
}
}
}
}
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