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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2021, Blender Foundation.
*/
/** \file
* \ingroup draw_engine
*/
#pragma once
#include "image_texture_info.hh"
/** \brief Create GPUBatch for a IMAGE_ScreenSpaceTextureInfo. */
class BatchUpdater {
TextureInfo &info;
GPUVertFormat format = {0};
int pos_id;
int uv_id;
public:
BatchUpdater(TextureInfo &info) : info(info)
{
}
void update_batch()
{
ensure_clear_batch();
ensure_format();
init_batch();
}
void discard_batch()
{
GPU_BATCH_DISCARD_SAFE(info.batch);
}
private:
void ensure_clear_batch()
{
GPU_BATCH_CLEAR_SAFE(info.batch);
if (info.batch == nullptr) {
info.batch = GPU_batch_calloc();
}
}
void init_batch()
{
GPUVertBuf *vbo = create_vbo();
GPU_batch_init_ex(info.batch, GPU_PRIM_TRI_FAN, vbo, nullptr, GPU_BATCH_OWNS_VBO);
}
GPUVertBuf *create_vbo()
{
GPUVertBuf *vbo = GPU_vertbuf_create_with_format(&format);
GPU_vertbuf_data_alloc(vbo, 4);
float pos[4][2];
fill_tri_fan_from_rctf(pos, info.clipping_bounds);
float uv[4][2];
fill_tri_fan_from_rctf(uv, info.clipping_uv_bounds);
for (int i = 0; i < 4; i++) {
GPU_vertbuf_attr_set(vbo, pos_id, i, pos[i]);
GPU_vertbuf_attr_set(vbo, uv_id, i, uv[i]);
}
return vbo;
}
static void fill_tri_fan_from_rctf(float result[4][2], rctf &rect)
{
result[0][0] = rect.xmin;
result[0][1] = rect.ymin;
result[1][0] = rect.xmax;
result[1][1] = rect.ymin;
result[2][0] = rect.xmax;
result[2][1] = rect.ymax;
result[3][0] = rect.xmin;
result[3][1] = rect.ymax;
}
void ensure_format()
{
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
GPU_vertformat_attr_add(&format, "uv", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
pos_id = GPU_vertformat_attr_id_get(&format, "pos");
uv_id = GPU_vertformat_attr_id_get(&format, "uv");
}
}
};
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