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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2016 by Mike Erwin. All rights reserved. */
/** \file
* \ingroup gpu
*/
#include "gpu_shader_interface.hh"
#include "gpu_vertex_buffer_private.hh"
#include "gl_batch.hh"
#include "gl_context.hh"
#include "gl_index_buffer.hh"
#include "gl_storage_buffer.hh"
#include "gl_vertex_buffer.hh"
#include "gl_vertex_array.hh"
namespace blender::gpu {
/* -------------------------------------------------------------------- */
/** \name Vertex Array Bindings
* \{ */
/** Returns enabled vertex pointers as a bit-flag (one bit per attribute). */
static uint16_t vbo_bind(const ShaderInterface *interface,
const GPUVertFormat *format,
uint v_first,
uint v_len,
const bool use_instancing)
{
uint16_t enabled_attrib = 0;
const uint attr_len = format->attr_len;
uint stride = format->stride;
uint offset = 0;
GLuint divisor = (use_instancing) ? 1 : 0;
for (uint a_idx = 0; a_idx < attr_len; a_idx++) {
const GPUVertAttr *a = &format->attrs[a_idx];
if (format->deinterleaved) {
offset += ((a_idx == 0) ? 0 : format->attrs[a_idx - 1].size) * v_len;
stride = a->size;
}
else {
offset = a->offset;
}
/* This is in fact an offset in memory. */
const GLvoid *pointer = (const GLubyte *)(intptr_t)(offset + v_first * stride);
const GLenum type = to_gl(static_cast<GPUVertCompType>(a->comp_type));
for (uint n_idx = 0; n_idx < a->name_len; n_idx++) {
const char *name = GPU_vertformat_attr_name_get(format, a, n_idx);
const ShaderInput *input = interface->attr_get(name);
if (input == nullptr || input->location == -1) {
continue;
}
enabled_attrib |= (1 << input->location);
if (ELEM(a->comp_len, 16, 12, 8)) {
BLI_assert(a->fetch_mode == GPU_FETCH_FLOAT);
BLI_assert(a->comp_type == GPU_COMP_F32);
for (int i = 0; i < a->comp_len / 4; i++) {
glEnableVertexAttribArray(input->location + i);
glVertexAttribDivisor(input->location + i, divisor);
glVertexAttribPointer(
input->location + i, 4, type, GL_FALSE, stride, (const GLubyte *)pointer + i * 16);
}
}
else {
glEnableVertexAttribArray(input->location);
glVertexAttribDivisor(input->location, divisor);
switch (a->fetch_mode) {
case GPU_FETCH_FLOAT:
case GPU_FETCH_INT_TO_FLOAT:
glVertexAttribPointer(input->location, a->comp_len, type, GL_FALSE, stride, pointer);
break;
case GPU_FETCH_INT_TO_FLOAT_UNIT:
glVertexAttribPointer(input->location, a->comp_len, type, GL_TRUE, stride, pointer);
break;
case GPU_FETCH_INT:
glVertexAttribIPointer(input->location, a->comp_len, type, stride, pointer);
break;
}
}
}
}
return enabled_attrib;
}
void GLVertArray::update_bindings(const GLuint vao,
const GPUBatch *batch_, /* Should be GLBatch. */
const ShaderInterface *interface,
const int base_instance)
{
const GLBatch *batch = static_cast<const GLBatch *>(batch_);
uint16_t attr_mask = interface->enabled_attr_mask_;
glBindVertexArray(vao);
/* Reverse order so first VBO'S have more prevalence (in term of attribute override). */
for (int v = GPU_BATCH_VBO_MAX_LEN - 1; v > -1; v--) {
GLVertBuf *vbo = batch->verts_(v);
if (vbo) {
vbo->bind();
attr_mask &= ~vbo_bind(interface, &vbo->format, 0, vbo->vertex_len, false);
}
}
for (int v = GPU_BATCH_INST_VBO_MAX_LEN - 1; v > -1; v--) {
GLVertBuf *vbo = batch->inst_(v);
if (vbo) {
vbo->bind();
attr_mask &= ~vbo_bind(interface, &vbo->format, base_instance, vbo->vertex_len, true);
}
}
if (batch->resource_id_buf) {
const ShaderInput *input = interface->attr_get("drw_ResourceID");
if (input) {
dynamic_cast<GLStorageBuf *>(unwrap(batch->resource_id_buf))->bind_as(GL_ARRAY_BUFFER);
glEnableVertexAttribArray(input->location);
glVertexAttribDivisor(input->location, 1);
glVertexAttribIPointer(
input->location, 1, to_gl(GPU_COMP_I32), sizeof(uint32_t), (GLvoid *)nullptr);
attr_mask &= ~(1 << input->location);
}
}
if (attr_mask != 0 && GLContext::vertex_attrib_binding_support) {
for (uint16_t mask = 1, a = 0; a < 16; a++, mask <<= 1) {
if (attr_mask & mask) {
GLContext *ctx = GLContext::get();
/* This replaces glVertexAttrib4f(a, 0.0f, 0.0f, 0.0f, 1.0f); with a more modern style.
* Fix issues for some drivers (see T75069). */
glBindVertexBuffer(a, ctx->default_attr_vbo_, (intptr_t)0, (intptr_t)0);
glEnableVertexAttribArray(a);
glVertexAttribFormat(a, 4, GL_FLOAT, GL_FALSE, 0);
glVertexAttribBinding(a, a);
}
}
}
if (batch->elem) {
/* Binds the index buffer. This state is also saved in the VAO. */
static_cast<GLIndexBuf *>(unwrap(batch->elem))->bind();
}
}
void GLVertArray::update_bindings(const GLuint vao,
const uint v_first,
const GPUVertFormat *format,
const ShaderInterface *interface)
{
glBindVertexArray(vao);
vbo_bind(interface, format, v_first, 0, false);
}
/** \} */
} // namespace blender::gpu
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