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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2017 Blender Foundation. All rights reserved. */
/** \file
* \ingroup draw
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#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
struct GPUVertBuf;
struct GPUIndexBuf;
struct GPUBatch;
struct GPUTexture;
typedef struct CurvesEvalFinalCache {
/* Output of the subdivision stage: vertex buffer sized to subdiv level. */
GPUVertBuf *proc_buf;
GPUTexture *proc_tex;
/* 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;
} CurvesEvalFinalCache;
/* Curves procedural display: Evaluation is done on the GPU. */
typedef struct CurvesEvalCache {
/* Input control points */
GPUVertBuf *proc_point_buf;
GPUTexture *point_tex;
/** Info of control points strands (segment count and base index) */
GPUVertBuf *proc_strand_buf;
GPUTexture *strand_tex;
/* Curve length data. */
GPUVertBuf *proc_length_buf;
GPUTexture *length_tex;
GPUVertBuf *proc_strand_seg_buf;
GPUTexture *strand_seg_tex;
CurvesEvalFinalCache final[MAX_HAIR_SUBDIV];
int strands_len;
int elems_len;
int point_len;
} CurvesEvalCache;
/**
* Ensure all textures and buffers needed for GPU accelerated drawing.
*/
bool curves_ensure_procedural_data(struct Object *object,
struct CurvesEvalCache **r_hair_cache,
struct GPUMaterial *gpu_material,
int subdiv,
int thickness_res);
#ifdef __cplusplus
}
#endif
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