147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright 2022 Blender Foundation. */
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#pragma once
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/** \file
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* \ingroup draw
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*
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* View description and states.
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*
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* A `draw::View` object is required for drawing geometry using the DRW api and its internal
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* culling system.
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*
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* One `View` object can actually contain multiple view matrices if the template parameter
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* `view_len` is greater than 1. This is called multi-view rendering and the vertex shader must
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* setting `drw_view_id` accordingly.
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*/
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#include "DRW_gpu_wrapper.hh"
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#include "DRW_render.h"
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#include "draw_shader_shared.h"
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namespace blender::draw {
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class Manager;
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/* TODO: de-duplicate. */
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using ObjectBoundsBuf = StorageArrayBuffer<ObjectBounds, 128>;
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using VisibilityBuf = StorageArrayBuffer<uint, 4, true>;
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class View {
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friend Manager;
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private:
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/** TODO(fclem): Maybe try to reduce the minimum cost if the number of view is lower. */
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UniformArrayBuffer<ViewMatrices, DRW_VIEW_MAX> data_;
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UniformArrayBuffer<ViewCullingData, DRW_VIEW_MAX> culling_;
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/** Frozen version of data_ used for debugging culling. */
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UniformArrayBuffer<ViewMatrices, DRW_VIEW_MAX> data_freeze_;
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UniformArrayBuffer<ViewCullingData, DRW_VIEW_MAX> culling_freeze_;
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/** Result of the visibility computation. 1 bit or 1 or 2 word per resource ID per view. */
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VisibilityBuf visibility_buf_;
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const char *debug_name_;
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int view_len_ = 0;
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bool is_inverted_ = false;
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bool do_visibility_ = true;
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bool dirty_ = true;
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bool frozen_ = false;
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public:
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View(const char *name, int view_len = 1)
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: visibility_buf_(name), debug_name_(name), view_len_(view_len)
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{
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BLI_assert(view_len < DRW_VIEW_MAX);
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}
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/* For compatibility with old system. Will be removed at some point. */
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View(const char *name, const DRWView *view)
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: visibility_buf_(name), debug_name_(name), view_len_(1)
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{
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float4x4 view_mat, win_mat;
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DRW_view_viewmat_get(view, view_mat.ptr(), false);
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DRW_view_winmat_get(view, win_mat.ptr(), false);
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this->sync(view_mat, win_mat);
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}
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void sync(const float4x4 &view_mat, const float4x4 &win_mat, int view_id = 0);
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bool is_persp(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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return data_[view_id].winmat[3][3] == 0.0f;
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}
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bool is_inverted(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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UNUSED_VARS_NDEBUG(view_id);
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return is_inverted_;
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}
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float far_clip(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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if (is_persp(view_id)) {
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return -data_[view_id].winmat[3][2] / (data_[view_id].winmat[2][2] + 1.0f);
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}
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return -(data_[view_id].winmat[3][2] - 1.0f) / data_[view_id].winmat[2][2];
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}
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float near_clip(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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if (is_persp(view_id)) {
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return -data_[view_id].winmat[3][2] / (data_[view_id].winmat[2][2] - 1.0f);
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}
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return -(data_[view_id].winmat[3][2] + 1.0f) / data_[view_id].winmat[2][2];
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}
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const float4x4 &viewmat(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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return data_[view_id].viewmat;
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}
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const float4x4 &viewinv(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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return data_[view_id].viewinv;
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}
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const float4x4 &winmat(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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return data_[view_id].winmat;
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}
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const float4x4 &wininv(int view_id = 0) const
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{
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BLI_assert(view_id < view_len_);
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return data_[view_id].wininv;
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}
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int visibility_word_per_draw() const
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{
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return (view_len_ == 1) ? 0 : divide_ceil_u(view_len_, 32);
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}
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private:
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/** Called from draw manager. */
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void bind();
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void compute_visibility(ObjectBoundsBuf &bounds, uint resource_len, bool debug_freeze);
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void update_viewport_size();
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void frustum_boundbox_calc(BoundBox &bbox, int view_id);
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void frustum_culling_planes_calc(int view_id);
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void frustum_culling_sphere_calc(const BoundBox &bbox, BoundSphere &bsphere, int view_id);
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};
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} // namespace blender::draw
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