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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2022 Blender Foundation. All rights reserved. */
/** \file
* \ingroup gpu
*/
#include "BLI_string.h"
#include "gpu_backend.hh"
#include "gpu_context_private.hh"
#include "gl_backend.hh"
#include "gl_debug.hh"
#include "gl_storage_buffer.hh"
#include "gl_vertex_buffer.hh"
namespace blender::gpu {
/* -------------------------------------------------------------------- */
/** \name Creation & Deletion
* \{ */
GLStorageBuf::GLStorageBuf(size_t size, GPUUsageType usage, const char *name)
: StorageBuf(size, name)
{
usage_ = usage;
/* Do not create UBO GL buffer here to allow allocation from any thread. */
BLI_assert(size <= GLContext::max_ssbo_size);
}
GLStorageBuf::~GLStorageBuf()
{
GLContext::buf_free(ssbo_id_);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Data upload / update
* \{ */
void GLStorageBuf::init()
{
BLI_assert(GLContext::get());
glGenBuffers(1, &ssbo_id_);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo_id_);
glBufferData(GL_SHADER_STORAGE_BUFFER, size_in_bytes_, nullptr, to_gl(this->usage_));
debug::object_label(GL_SHADER_STORAGE_BUFFER, ssbo_id_, name_);
}
void GLStorageBuf::update(const void *data)
{
if (ssbo_id_ == 0) {
this->init();
}
glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo_id_);
glBufferSubData(GL_SHADER_STORAGE_BUFFER, 0, size_in_bytes_, data);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Usage
* \{ */
void GLStorageBuf::bind(int slot)
{
if (slot >= GLContext::max_ssbo_binds) {
fprintf(
stderr,
"Error: Trying to bind \"%s\" ssbo to slot %d which is above the reported limit of %d.\n",
name_,
slot,
GLContext::max_ssbo_binds);
return;
}
if (ssbo_id_ == 0) {
this->init();
}
if (data_ != nullptr) {
this->update(data_);
MEM_SAFE_FREE(data_);
}
slot_ = slot;
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, slot_, ssbo_id_);
#ifdef DEBUG
BLI_assert(slot < 16);
/* TODO */
// GLContext::get()->bound_ssbo_slots |= 1 << slot;
#endif
}
void GLStorageBuf::bind_as(GLenum target)
{
BLI_assert_msg(ssbo_id_ != 0,
"Trying to use storage buf as indirect buffer but buffer was never filled.");
glBindBuffer(target, ssbo_id_);
}
void GLStorageBuf::unbind()
{
#ifdef DEBUG
/* NOTE: This only unbinds the last bound slot. */
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, slot_, 0);
/* Hope that the context did not change. */
/* TODO */
// GLContext::get()->bound_ssbo_slots &= ~(1 << slot_);
#endif
slot_ = 0;
}
void GLStorageBuf::clear(eGPUTextureFormat internal_format, eGPUDataFormat data_format, void *data)
{
if (ssbo_id_ == 0) {
this->init();
}
if (GLContext::direct_state_access_support) {
glClearNamedBufferData(ssbo_id_,
to_gl_internal_format(internal_format),
to_gl_data_format(internal_format),
to_gl(data_format),
data);
}
else {
/* WATCH(@fclem): This should be ok since we only use clear outside of drawing functions. */
glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo_id_);
glClearBufferData(GL_SHADER_STORAGE_BUFFER,
to_gl_internal_format(internal_format),
to_gl_data_format(internal_format),
to_gl(data_format),
data);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
}
}
void GLStorageBuf::copy_sub(VertBuf *src_, uint dst_offset, uint src_offset, uint copy_size)
{
GLVertBuf *src = static_cast<GLVertBuf *>(src_);
GLStorageBuf *dst = this;
if (dst->ssbo_id_ == 0) {
dst->init();
}
if (src->vbo_id_ == 0) {
src->bind();
}
if (GLContext::direct_state_access_support) {
glCopyNamedBufferSubData(src->vbo_id_, dst->ssbo_id_, src_offset, dst_offset, copy_size);
}
else {
/* This binds the buffer to GL_ARRAY_BUFFER and upload the data if any. */
src->bind();
glBindBuffer(GL_COPY_WRITE_BUFFER, dst->ssbo_id_);
glCopyBufferSubData(GL_ARRAY_BUFFER, GL_COPY_WRITE_BUFFER, src_offset, dst_offset, copy_size);
glBindBuffer(GL_COPY_WRITE_BUFFER, 0);
}
}
/** \} */
} // namespace blender::gpu
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