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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2017 Blender Foundation. All rights reserved. */
/** \file
* \ingroup draw
*/
#pragma once
#include "BKE_attribute.h"
#include "GPU_shader.h"
#include "draw_attributes.h"
#ifdef __cplusplus
extern "C" {
#endif
struct Curves;
struct GPUVertBuf;
struct GPUIndexBuf;
struct GPUBatch;
struct GPUTexture;
#define MAX_THICKRES 2 /* see eHairType */
#define MAX_HAIR_SUBDIV 4 /* see hair_subdiv rna */
typedef enum CurvesEvalShader {
CURVES_EVAL_CATMULL_ROM = 0,
CURVES_EVAL_BEZIER = 1,
} CurvesEvalShader;
#define CURVES_EVAL_SHADER_NUM 3
typedef struct CurvesEvalFinalCache {
/* Output of the subdivision stage: vertex buffer sized to subdiv level. */
GPUVertBuf *proc_buf;
/** Just contains a huge index buffer used to draw the final curves. */
GPUBatch *proc_hairs[MAX_THICKRES];
/** Points per curve, at least 2. */
int strands_res;
/** Attributes currently being drawn or about to be drawn. */
DRW_Attributes attr_used;
/**
* Attributes that were used at some point. This is used for garbage collection, to remove
* attributes that are not used in shaders anymore due to user edits.
*/
DRW_Attributes attr_used_over_time;
/**
* The last time in seconds that the `attr_used` and `attr_used_over_time` were exactly the same.
* If the delta between this time and the current scene time is greater than the timeout set in
* user preferences (`U.vbotimeout`) then garbage collection is performed.
*/
int last_attr_matching_time;
/* Output of the subdivision stage: vertex buffers sized to subdiv level. This is only attributes
* on point domain. */
GPUVertBuf *attributes_buf[GPU_MAX_ATTR];
} CurvesEvalFinalCache;
/* Curves procedural display: Evaluation is done on the GPU. */
typedef struct CurvesEvalCache {
/* Input control point positions combined with parameter data. */
GPUVertBuf *proc_point_buf;
/* Editmode data (such as selection flags) used by overlay_edit_curve_point.glsl */
GPUVertBuf *data_edit_points;
/** Info of control points strands (segment count and base index) */
GPUVertBuf *proc_strand_buf;
/* Curve length data. */
GPUVertBuf *proc_length_buf;
GPUVertBuf *proc_strand_seg_buf;
CurvesEvalFinalCache final[MAX_HAIR_SUBDIV];
/* 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. */
GPUVertBuf *proc_attributes_buf[GPU_MAX_ATTR];
int strands_len;
int elems_len;
int point_len;
} CurvesEvalCache;
/**
* Ensure all necessary textures and buffers exist for GPU accelerated drawing.
*/
bool curves_ensure_procedural_data(struct Curves *curves,
struct CurvesEvalCache **r_hair_cache,
struct GPUMaterial *gpu_material,
int subdiv,
int thickness_res);
void drw_curves_get_attribute_sampler_name(const char *layer_name, char r_sampler_name[32]);
#ifdef __cplusplus
}
#endif
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