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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2016 by Mike Erwin. All rights reserved. */
/** \file
* \ingroup gpu
*
* Mimics old style opengl immediate mode drawing.
*/
#include "BKE_global.h"
#include "gpu_context_private.hh"
#include "gpu_shader_private.hh"
#include "gpu_vertex_format_private.h"
#include "gl_context.hh"
#include "gl_debug.hh"
#include "gl_primitive.hh"
#include "gl_vertex_array.hh"
#include "gl_immediate.hh"
namespace blender::gpu {
/* -------------------------------------------------------------------- */
/** \name Creation & Deletion
* \{ */
GLImmediate::GLImmediate()
{
glGenVertexArrays(1, &vao_id_);
glBindVertexArray(vao_id_); /* Necessary for glObjectLabel. */
buffer.buffer_size = DEFAULT_INTERNAL_BUFFER_SIZE;
glGenBuffers(1, &buffer.vbo_id);
glBindBuffer(GL_ARRAY_BUFFER, buffer.vbo_id);
glBufferData(GL_ARRAY_BUFFER, buffer.buffer_size, nullptr, GL_DYNAMIC_DRAW);
buffer_strict.buffer_size = DEFAULT_INTERNAL_BUFFER_SIZE;
glGenBuffers(1, &buffer_strict.vbo_id);
glBindBuffer(GL_ARRAY_BUFFER, buffer_strict.vbo_id);
glBufferData(GL_ARRAY_BUFFER, buffer_strict.buffer_size, nullptr, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
debug::object_label(GL_VERTEX_ARRAY, vao_id_, "Immediate");
debug::object_label(GL_BUFFER, buffer.vbo_id, "ImmediateVbo");
debug::object_label(GL_BUFFER, buffer_strict.vbo_id, "ImmediateVboStrict");
}
GLImmediate::~GLImmediate()
{
glDeleteVertexArrays(1, &vao_id_);
glDeleteBuffers(1, &buffer.vbo_id);
glDeleteBuffers(1, &buffer_strict.vbo_id);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Buffer management
* \{ */
uchar *GLImmediate::begin()
{
/* How many bytes do we need for this draw call? */
const size_t bytes_needed = vertex_buffer_size(&vertex_format, vertex_len);
/* Does the current buffer have enough room? */
const size_t available_bytes = buffer_size() - buffer_offset();
GL_CHECK_RESOURCES("Immediate");
glBindBuffer(GL_ARRAY_BUFFER, vbo_id());
bool recreate_buffer = false;
if (bytes_needed > buffer_size()) {
/* expand the internal buffer */
buffer_size() = bytes_needed;
recreate_buffer = true;
}
else if (bytes_needed < DEFAULT_INTERNAL_BUFFER_SIZE &&
buffer_size() > DEFAULT_INTERNAL_BUFFER_SIZE) {
/* shrink the internal buffer */
buffer_size() = DEFAULT_INTERNAL_BUFFER_SIZE;
recreate_buffer = true;
}
/* ensure vertex data is aligned */
/* Might waste a little space, but it's safe. */
const uint pre_padding = padding(buffer_offset(), vertex_format.stride);
if (!recreate_buffer && ((bytes_needed + pre_padding) <= available_bytes)) {
buffer_offset() += pre_padding;
}
else {
/* orphan this buffer & start with a fresh one */
glBufferData(GL_ARRAY_BUFFER, buffer_size(), nullptr, GL_DYNAMIC_DRAW);
buffer_offset() = 0;
}
#ifndef NDEBUG
{
GLint bufsize;
glGetBufferParameteriv(GL_ARRAY_BUFFER, GL_BUFFER_SIZE, &bufsize);
BLI_assert(buffer_offset() + bytes_needed <= bufsize);
}
#endif
GLbitfield access = GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
if (!strict_vertex_len) {
access |= GL_MAP_FLUSH_EXPLICIT_BIT;
}
void *data = glMapBufferRange(GL_ARRAY_BUFFER, buffer_offset(), bytes_needed, access);
BLI_assert(data != nullptr);
bytes_mapped_ = bytes_needed;
return (uchar *)data;
}
void GLImmediate::end()
{
BLI_assert(prim_type != GPU_PRIM_NONE); /* make sure we're between a Begin/End pair */
uint buffer_bytes_used = bytes_mapped_;
if (!strict_vertex_len) {
if (vertex_idx != vertex_len) {
vertex_len = vertex_idx;
buffer_bytes_used = vertex_buffer_size(&vertex_format, vertex_len);
/* unused buffer bytes are available to the next immBegin */
}
/* tell OpenGL what range was modified so it doesn't copy the whole mapped range */
glFlushMappedBufferRange(GL_ARRAY_BUFFER, 0, buffer_bytes_used);
}
glUnmapBuffer(GL_ARRAY_BUFFER);
if (vertex_len > 0) {
GLContext::get()->state_manager->apply_state();
/* We convert the offset in vertex offset from the buffer's start.
* This works because we added some padding to align the first vertex. */
uint v_first = buffer_offset() / vertex_format.stride;
GLVertArray::update_bindings(
vao_id_, v_first, &vertex_format, reinterpret_cast<Shader *>(shader)->interface);
/* Update matrices. */
GPU_shader_bind(shader);
#ifdef __APPLE__
glDisable(GL_PRIMITIVE_RESTART);
#endif
glDrawArrays(to_gl(prim_type), 0, vertex_len);
#ifdef __APPLE__
glEnable(GL_PRIMITIVE_RESTART);
#endif
/* These lines are causing crash on startup on some old GPU + drivers.
* They are not required so just comment them. (T55722) */
// glBindBuffer(GL_ARRAY_BUFFER, 0);
// glBindVertexArray(0);
}
buffer_offset() += buffer_bytes_used;
}
/** \} */
} // namespace blender::gpu
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