1 files changed, 75 insertions, 0 deletions
diff --git a/source/blender/draw/intern/draw_curves_private.h b/source/blender/draw/intern/draw_curves_private.h
new file mode 100644
index 00000000000..76d5f15319d
--- /dev/null
+++ b/source/blender/draw/intern/draw_curves_private.h
@@ -0,0 +1,75 @@
+/* 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