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// Gawain vertex buffer
//
// This code is part of the Gawain library, with modifications
// specific to integration with Blender.
//
// Copyright 2016 Mike Erwin
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
#pragma once
#include "vertex_format.h"
// How to create a Gwn_VertBuf:
// 1) verts = GWN_vertbuf_create() or GWN_vertbuf_init(verts)
// 2) GWN_vertformat_attr_add(verts->format, ...)
// 3) GWN_vertbuf_data_alloc(verts, vertex_ct) <-- finalizes/packs vertex format
// 4) GWN_vertbuf_attr_fill(verts, pos, application_pos_buffer)
// Is Gwn_VertBuf always used as part of a Gwn_Batch?
typedef struct {
Gwn_VertFormat format;
unsigned vertex_ct;
GLubyte* data; // NULL indicates data in VRAM (unmapped) or not yet allocated
GLuint vbo_id; // 0 indicates not yet sent to VRAM
} Gwn_VertBuf;
Gwn_VertBuf* GWN_vertbuf_create(void);
Gwn_VertBuf* GWN_vertbuf_create_with_format(const Gwn_VertFormat*);
void GWN_vertbuf_discard(Gwn_VertBuf*);
void GWN_vertbuf_init(Gwn_VertBuf*);
void GWN_vertbuf_init_with_format(Gwn_VertBuf*, const Gwn_VertFormat*);
unsigned GWN_vertbuf_size_get(const Gwn_VertBuf*);
void GWN_vertbuf_data_alloc(Gwn_VertBuf*, unsigned v_ct);
void GWN_vertbuf_data_resize(Gwn_VertBuf*, unsigned v_ct);
// The most important set_attrib variant is the untyped one. Get it right first.
// It takes a void* so the app developer is responsible for matching their app data types
// to the vertex attribute's type and component count. They're in control of both, so this
// should not be a problem.
void GWN_vertbuf_attr_set(Gwn_VertBuf*, unsigned a_idx, unsigned v_idx, const void* data);
void GWN_vertbuf_attr_fill(Gwn_VertBuf*, unsigned a_idx, const void* data); // tightly packed, non interleaved input data
void GWN_vertbuf_attr_fill_stride(Gwn_VertBuf*, unsigned a_idx, unsigned stride, const void* data);
// TODO: decide whether to keep the functions below
// doesn't immediate mode satisfy these needs?
// void setAttrib1f(unsigned a_idx, unsigned v_idx, float x);
// void setAttrib2f(unsigned a_idx, unsigned v_idx, float x, float y);
// void setAttrib3f(unsigned a_idx, unsigned v_idx, float x, float y, float z);
// void setAttrib4f(unsigned a_idx, unsigned v_idx, float x, float y, float z, float w);
//
// void setAttrib3ub(unsigned a_idx, unsigned v_idx, unsigned char r, unsigned char g, unsigned char b);
// void setAttrib4ub(unsigned a_idx, unsigned v_idx, unsigned char r, unsigned char g, unsigned char b, unsigned char a);
void GWN_vertbuf_use(Gwn_VertBuf*);
// Metrics
unsigned GWN_vertbuf_get_memory_usage(void);
// Macros
#define GWN_VERTBUF_DISCARD_SAFE(verts) do { \
if (verts != NULL) { \
GWN_vertbuf_discard(verts); \
verts = NULL; \
} \
} while (0)
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