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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. All rights reserved. */
/** \file
* \ingroup draw
*/
#include "MEM_guardedalloc.h"
#include "BLI_string.h"
#include "draw_subdivision.h"
#include "extract_mesh.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract VCol
* \{ */
/* Initialize the common vertex format for vcol for coarse and subdivided meshes. */
static void init_vcol_format(GPUVertFormat *format,
const MeshBatchCache *cache,
CustomData *cd_ldata)
{
GPU_vertformat_deinterleave(format);
const uint32_t vcol_layers = cache->cd_used.vcol;
for (int i = 0; i < MAX_MCOL; i++) {
if (vcol_layers & (1 << i)) {
char attr_name[32], attr_safe_name[GPU_MAX_SAFE_ATTR_NAME];
const char *layer_name = CustomData_get_layer_name(cd_ldata, CD_MLOOPCOL, i);
GPU_vertformat_safe_attr_name(layer_name, attr_safe_name, GPU_MAX_SAFE_ATTR_NAME);
BLI_snprintf(attr_name, sizeof(attr_name), "c%s", attr_safe_name);
GPU_vertformat_attr_add(format, attr_name, GPU_COMP_U16, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
if (i == CustomData_get_render_layer(cd_ldata, CD_MLOOPCOL)) {
GPU_vertformat_alias_add(format, "c");
}
if (i == CustomData_get_active_layer(cd_ldata, CD_MLOOPCOL)) {
GPU_vertformat_alias_add(format, "ac");
}
/* Gather number of auto layers. */
/* We only do `vcols` that are not overridden by `uvs`. */
if (CustomData_get_named_layer_index(cd_ldata, CD_MLOOPUV, layer_name) == -1) {
BLI_snprintf(attr_name, sizeof(attr_name), "a%s", attr_safe_name);
GPU_vertformat_alias_add(format, attr_name);
}
}
}
}
/* Vertex format for vertex colors, only used during the coarse data upload for the subdivision
* case. */
static GPUVertFormat *get_coarse_vcol_format()
{
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "cCol", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
GPU_vertformat_alias_add(&format, "c");
GPU_vertformat_alias_add(&format, "ac");
}
return &format;
}
using gpuMeshVcol = struct gpuMeshVcol {
ushort r, g, b, a;
};
static void extract_vcol_init(const MeshRenderData *mr,
struct MeshBatchCache *cache,
void *buf,
void *UNUSED(tls_data))
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
GPUVertFormat format = {0};
CustomData *cd_ldata = (mr->extract_type == MR_EXTRACT_BMESH) ? &mr->bm->ldata : &mr->me->ldata;
const uint32_t vcol_layers = cache->cd_used.vcol;
init_vcol_format(&format, cache, cd_ldata);
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->loop_len);
gpuMeshVcol *vcol_data = (gpuMeshVcol *)GPU_vertbuf_get_data(vbo);
for (int i = 0; i < MAX_MCOL; i++) {
if (vcol_layers & (1 << i)) {
if (mr->extract_type == MR_EXTRACT_BMESH) {
int cd_ofs = CustomData_get_n_offset(cd_ldata, CD_MLOOPCOL, i);
BMIter f_iter;
BMFace *efa;
BM_ITER_MESH (efa, &f_iter, mr->bm, BM_FACES_OF_MESH) {
BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(efa);
do {
const MLoopCol *mloopcol = (const MLoopCol *)BM_ELEM_CD_GET_VOID_P(l_iter, cd_ofs);
vcol_data->r = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->r]);
vcol_data->g = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->g]);
vcol_data->b = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->b]);
vcol_data->a = unit_float_to_ushort_clamp(mloopcol->a * (1.0f / 255.0f));
vcol_data++;
} while ((l_iter = l_iter->next) != l_first);
}
}
else {
const MLoopCol *mloopcol = (MLoopCol *)CustomData_get_layer_n(cd_ldata, CD_MLOOPCOL, i);
for (int ml_index = 0; ml_index < mr->loop_len; ml_index++, mloopcol++, vcol_data++) {
vcol_data->r = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->r]);
vcol_data->g = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->g]);
vcol_data->b = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->b]);
vcol_data->a = unit_float_to_ushort_clamp(mloopcol->a * (1.0f / 255.0f));
}
}
}
}
}
static void extract_vcol_init_subdiv(const DRWSubdivCache *subdiv_cache,
const MeshRenderData *UNUSED(mr),
struct MeshBatchCache *cache,
void *buffer,
void *UNUSED(data))
{
GPUVertBuf *dst_buffer = static_cast<GPUVertBuf *>(buffer);
Mesh *coarse_mesh = subdiv_cache->mesh;
GPUVertFormat format = {0};
init_vcol_format(&format, cache, &coarse_mesh->ldata);
GPU_vertbuf_init_build_on_device(dst_buffer, &format, subdiv_cache->num_subdiv_loops);
GPUVertBuf *src_data = GPU_vertbuf_calloc();
/* Dynamic as we upload and interpolate layers one at a time. */
GPU_vertbuf_init_with_format_ex(src_data, get_coarse_vcol_format(), GPU_USAGE_DYNAMIC);
GPU_vertbuf_data_alloc(src_data, coarse_mesh->totloop);
gpuMeshVcol *mesh_vcol = (gpuMeshVcol *)GPU_vertbuf_get_data(src_data);
const CustomData *cd_ldata = &coarse_mesh->ldata;
const uint vcol_layers = cache->cd_used.vcol;
/* Index of the vertex color layer in the compact buffer. Used vertex color layers are stored in
* a single buffer. */
int pack_layer_index = 0;
for (int i = 0; i < MAX_MTFACE; i++) {
if (vcol_layers & (1 << i)) {
/* Include stride in offset, we use a stride of 2 since colors are packed into 2 uints. */
const int dst_offset = (int)subdiv_cache->num_subdiv_loops * 2 * pack_layer_index++;
const MLoopCol *mloopcol = (MLoopCol *)CustomData_get_layer_n(cd_ldata, CD_MLOOPCOL, i);
gpuMeshVcol *vcol = mesh_vcol;
for (int ml_index = 0; ml_index < coarse_mesh->totloop; ml_index++, vcol++, mloopcol++) {
vcol->r = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->r]);
vcol->g = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->g]);
vcol->b = unit_float_to_ushort_clamp(BLI_color_from_srgb_table[mloopcol->b]);
vcol->a = unit_float_to_ushort_clamp(mloopcol->a * (1.0f / 255.0f));
}
/* Ensure data is uploaded properly. */
GPU_vertbuf_tag_dirty(src_data);
draw_subdiv_interp_custom_data(subdiv_cache, src_data, dst_buffer, 4, dst_offset);
}
}
GPU_vertbuf_discard(src_data);
}
constexpr MeshExtract create_extractor_vcol()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_vcol_init;
extractor.init_subdiv = extract_vcol_init_subdiv;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = 0;
extractor.use_threading = false;
extractor.mesh_buffer_offset = offsetof(MeshBufferList, vbo.vcol);
return extractor;
}
/** \} */
} // namespace blender::draw
extern "C" {
const MeshExtract extract_vcol = blender::draw::create_extractor_vcol();
}
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