draw_curves_private.hh

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/* SPDX-FileCopyrightText: 2017 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "GPU_shader.hh"
 
#include "draw_attributes.hh"
 
struct Curves;
namespace blender::gpu {
class Batch;
class VertBuf;
}  // namespace blender::gpu
struct GPUMaterial;
 
namespace blender::draw {
 
#define MAX_THICKRES 2    /* see eHairType */
#define MAX_HAIR_SUBDIV 4 /* see hair_subdiv rna */
 
enum CurvesEvalShader {
  CURVES_EVAL_CATMULL_ROM = 0,
  CURVES_EVAL_BEZIER = 1,
};
#define CURVES_EVAL_SHADER_NUM 3
 
struct CurvesEvalFinalCache {
  int hair_subdiv;
  /* The "strand or strip" setting from the scene. See #MAX_THICKRES. */
  int thickres;
 
  /* Output of the subdivision stage: vertex buffer sized to subdiv level. */
  gpu::VertBuf *proc_buf;
 
  gpu::Batch *proc_hairs;
 
  int resolution;
 
  DRW_Attributes attr_used;
 
  DRW_Attributes attr_used_over_time;
 
  int last_attr_matching_time;
 
  /* Output of the subdivision stage: vertex buffers sized to subdiv level. This is only attributes
   * on point domain. */
  gpu::VertBuf *attributes_buf[GPU_MAX_ATTR];
};
 
/* Curves procedural display: Evaluation is done on the GPU. */
struct CurvesEvalCache {
  /* Control point positions on evaluated data-block combined with parameter data. */
  gpu::VertBuf *proc_point_buf;
 
  gpu::VertBuf *proc_strand_buf;
 
  /* Curve length data. */
  gpu::VertBuf *proc_length_buf;
 
  gpu::VertBuf *proc_strand_seg_buf;
 
  CurvesEvalFinalCache final;
 
  /* For point attributes, which need subdivision, these buffers contain the input data.
   * For curve domain attributes, which do not need subdivision, these are the final data. */
  gpu::VertBuf *proc_attributes_buf[GPU_MAX_ATTR];
 
  int curves_num;
  int points_num;
};
 
bool curves_ensure_procedural_data(Curves *curves_id,
                                   CurvesEvalCache **r_cache,
                                   const GPUMaterial *gpu_material,
                                   int subdiv,
                                   int thickness_res);
 
void drw_curves_get_attribute_sampler_name(const char *layer_name, char r_sampler_name[32]);
 
}  // namespace blender::draw