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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2022 Blender Foundation.
*/
#include "BKE_global.h"
#include "eevee_instance.hh"
#include "eevee_hizbuffer.hh"
namespace blender::eevee {
/* -------------------------------------------------------------------- */
/** \name Hierarchical-Z buffer
*
* \{ */
void HiZBuffer::sync()
{
RenderBuffers &render_buffers = inst_.render_buffers;
int2 render_extent = inst_.film.render_extent_get();
/* Padding to avoid complexity during down-sampling and screen tracing. */
int2 hiz_extent = math::ceil_to_multiple(render_extent, int2(1u << (HIZ_MIP_COUNT - 1)));
int2 dispatch_size = math::divide_ceil(hiz_extent, int2(HIZ_GROUP_SIZE));
hiz_tx_.ensure_2d(GPU_R32F, hiz_extent, nullptr, HIZ_MIP_COUNT);
hiz_tx_.ensure_mip_views();
GPU_texture_mipmap_mode(hiz_tx_, true, false);
data_.uv_scale = float2(render_extent) / float2(hiz_extent);
data_.push_update();
{
hiz_update_ps_ = DRW_pass_create("HizUpdate", DRW_STATE_NO_DRAW);
GPUShader *sh = inst_.shaders.static_shader_get(HIZ_UPDATE);
DRWShadingGroup *grp = DRW_shgroup_create(sh, hiz_update_ps_);
DRW_shgroup_storage_block(grp, "finished_tile_counter", atomic_tile_counter_);
DRW_shgroup_uniform_texture_ref_ex(grp, "depth_tx", &render_buffers.depth_tx, with_filter);
DRW_shgroup_uniform_image(grp, "out_mip_0", hiz_tx_.mip_view(0));
DRW_shgroup_uniform_image(grp, "out_mip_1", hiz_tx_.mip_view(1));
DRW_shgroup_uniform_image(grp, "out_mip_2", hiz_tx_.mip_view(2));
DRW_shgroup_uniform_image(grp, "out_mip_3", hiz_tx_.mip_view(3));
DRW_shgroup_uniform_image(grp, "out_mip_4", hiz_tx_.mip_view(4));
DRW_shgroup_uniform_image(grp, "out_mip_5", hiz_tx_.mip_view(5));
DRW_shgroup_uniform_image(grp, "out_mip_6", hiz_tx_.mip_view(6));
DRW_shgroup_uniform_image(grp, "out_mip_7", hiz_tx_.mip_view(7));
/* TODO(@fclem): There might be occasions where we might not want to
* copy mip 0 for performance reasons if there is no need for it. */
DRW_shgroup_uniform_bool_copy(grp, "update_mip_0", true);
DRW_shgroup_call_compute(grp, UNPACK2(dispatch_size), 1);
DRW_shgroup_barrier(grp, GPU_BARRIER_TEXTURE_FETCH);
}
if (inst_.debug_mode == eDebugMode::DEBUG_HIZ_VALIDATION) {
DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_CUSTOM;
debug_draw_ps_ = DRW_pass_create("HizUpdate.Debug", state);
GPUShader *sh = inst_.shaders.static_shader_get(HIZ_DEBUG);
DRWShadingGroup *grp = DRW_shgroup_create(sh, debug_draw_ps_);
this->bind_resources(grp);
DRW_shgroup_call_procedural_triangles(grp, nullptr, 1);
}
else {
debug_draw_ps_ = nullptr;
}
}
void HiZBuffer::update()
{
if (!is_dirty_) {
return;
}
/* Bind another framebuffer in order to avoid triggering the feedback loop check.
* This is safe because we only use compute shaders in this section of the code.
* Ideally the check should be smarter. */
GPUFrameBuffer *fb = GPU_framebuffer_active_get();
if (G.debug & G_DEBUG_GPU) {
GPU_framebuffer_restore();
}
DRW_draw_pass(hiz_update_ps_);
if (G.debug & G_DEBUG_GPU) {
GPU_framebuffer_bind(fb);
}
}
void HiZBuffer::debug_draw(GPUFrameBuffer *view_fb)
{
if (debug_draw_ps_ == nullptr) {
return;
}
inst_.info = "Debug Mode: HiZ Validation";
inst_.hiz_buffer.update();
GPU_framebuffer_bind(view_fb);
DRW_draw_pass(debug_draw_ps_);
}
/** \} */
} // namespace blender::eevee
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