893130e6fe
Similar to fe76d8c946
Pull Request: https://projects.blender.org/blender/blender/pulls/119898
91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/* SPDX-FileCopyrightText: 2021 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup draw_engine
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*/
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#pragma once
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#include "image_texture_info.hh"
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namespace blender::draw::image_engine {
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/** \brief Create gpu::Batch for a IMAGE_ScreenSpaceTextureInfo. */
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class BatchUpdater {
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TextureInfo &info;
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GPUVertFormat format = {0};
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int pos_id;
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int uv_id;
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public:
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BatchUpdater(TextureInfo &info) : info(info) {}
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void update_batch()
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{
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ensure_clear_batch();
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ensure_format();
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init_batch();
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}
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private:
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void ensure_clear_batch()
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{
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GPU_BATCH_CLEAR_SAFE(info.batch);
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if (info.batch == nullptr) {
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info.batch = GPU_batch_calloc();
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}
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}
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void init_batch()
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{
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gpu::VertBuf *vbo = create_vbo();
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GPU_batch_init_ex(info.batch, GPU_PRIM_TRI_FAN, vbo, nullptr, GPU_BATCH_OWNS_VBO);
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}
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template<typename DataType, typename RectType>
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static void fill_tri_fan_from_rect(DataType result[4][2], RectType &rect)
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{
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result[0][0] = rect.xmin;
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result[0][1] = rect.ymin;
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result[1][0] = rect.xmax;
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result[1][1] = rect.ymin;
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result[2][0] = rect.xmax;
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result[2][1] = rect.ymax;
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result[3][0] = rect.xmin;
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result[3][1] = rect.ymax;
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}
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gpu::VertBuf *create_vbo()
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{
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gpu::VertBuf *vbo = GPU_vertbuf_create_with_format(&format);
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GPU_vertbuf_data_alloc(vbo, 4);
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int pos[4][2];
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fill_tri_fan_from_rect<int, rcti>(pos, info.clipping_bounds);
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float uv[4][2];
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fill_tri_fan_from_rect<float, rctf>(uv, info.clipping_uv_bounds);
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for (int i = 0; i < 4; i++) {
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GPU_vertbuf_attr_set(vbo, pos_id, i, pos[i]);
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GPU_vertbuf_attr_set(vbo, uv_id, i, uv[i]);
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}
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return vbo;
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}
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void ensure_format()
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{
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if (format.attr_len == 0) {
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GPU_vertformat_attr_add(&format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT);
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GPU_vertformat_attr_add(&format, "uv", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
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pos_id = GPU_vertformat_attr_id_get(&format, "pos");
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uv_id = GPU_vertformat_attr_id_get(&format, "uv");
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}
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}
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};
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} // namespace blender::draw::image_engine
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