GPU_batch_presets: move static vars into struct
Also use GWN raw stepping API to fill in data.
This commit is contained in:
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source/blender/gpu/intern/gpu_batch_presets.c
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source/blender/gpu/intern/gpu_batch_presets.c
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/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2016 Blender Foundation.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): Mike Erwin
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/gpu/intern/gpu_batch_presets.c
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* \ingroup gpu
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*/
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#include "BLI_utildefines.h"
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#include "BLI_math.h"
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#include "GPU_batch.h"
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#include "gpu_shader_private.h"
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/* Struct to store 3D Batches and their format */
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static struct {
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struct {
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Gwn_Batch *sphere_high;
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Gwn_Batch *sphere_med;
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Gwn_Batch *sphere_low;
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Gwn_Batch *sphere_wire_low;
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Gwn_Batch *sphere_wire_med;
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} batch;
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Gwn_VertFormat format;
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struct {
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uint pos, nor;
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} attr_id;
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} g_presets_3d = {0};
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/* We may want 2D presets later. */
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/* -------------------------------------------------------------------- */
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/** \name 3D Primitives
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* \{ */
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static void batch_sphere_lat_lon_vert(
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Gwn_VertBufRaw *pos_step, Gwn_VertBufRaw *nor_step,
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float lat, float lon)
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{
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float pos[3];
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pos[0] = sinf(lat) * cosf(lon);
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pos[1] = cosf(lat);
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pos[2] = sinf(lat) * sinf(lon);
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copy_v3_v3(GWN_vertbuf_raw_step(pos_step), pos);
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copy_v3_v3(GWN_vertbuf_raw_step(nor_step), pos);
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}
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/* Replacement for gluSphere */
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static Gwn_Batch *batch_sphere(int lat_res, int lon_res)
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{
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const float lon_inc = 2 * M_PI / lon_res;
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const float lat_inc = M_PI / lat_res;
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float lon, lat;
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Gwn_VertBuf *vbo = GWN_vertbuf_create_with_format(&g_presets_3d.format);
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const uint vbo_len = (lat_res - 1) * lon_res * 6;
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GWN_vertbuf_data_alloc(vbo, vbo_len);
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Gwn_VertBufRaw pos_step, nor_step;
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GWN_vertbuf_attr_get_raw_data(vbo, g_presets_3d.attr_id.pos, &pos_step);
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GWN_vertbuf_attr_get_raw_data(vbo, g_presets_3d.attr_id.nor, &nor_step);
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lon = 0.0f;
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for (int i = 0; i < lon_res; i++, lon += lon_inc) {
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lat = 0.0f;
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for (int j = 0; j < lat_res; j++, lat += lat_inc) {
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if (j != lat_res - 1) { /* Pole */
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat + lat_inc, lon + lon_inc);
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat + lat_inc, lon);
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat, lon);
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}
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if (j != 0) { /* Pole */
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat, lon + lon_inc);
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat + lat_inc, lon + lon_inc);
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat, lon);
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}
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}
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}
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BLI_assert(vbo_len == GWN_vertbuf_raw_used(&pos_step));
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BLI_assert(vbo_len == GWN_vertbuf_raw_used(&nor_step));
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return GWN_batch_create_ex(GWN_PRIM_TRIS, vbo, NULL, GWN_BATCH_OWNS_VBO);
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}
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static Gwn_Batch *batch_sphere_wire(int lat_res, int lon_res)
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{
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const float lon_inc = 2 * M_PI / lon_res;
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const float lat_inc = M_PI / lat_res;
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float lon, lat;
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Gwn_VertBuf *vbo = GWN_vertbuf_create_with_format(&g_presets_3d.format);
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const uint vbo_len = (lat_res * lon_res * 2) + ((lat_res - 1) * lon_res * 2);
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GWN_vertbuf_data_alloc(vbo, vbo_len);
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Gwn_VertBufRaw pos_step, nor_step;
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GWN_vertbuf_attr_get_raw_data(vbo, g_presets_3d.attr_id.pos, &pos_step);
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GWN_vertbuf_attr_get_raw_data(vbo, g_presets_3d.attr_id.nor, &nor_step);
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lon = 0.0f;
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for (int i = 0; i < lon_res; i++, lon += lon_inc) {
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lat = 0.0f;
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for (int j = 0; j < lat_res; j++, lat += lat_inc) {
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat + lat_inc, lon);
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat, lon);
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if (j != lat_res - 1) { /* Pole */
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat + lat_inc, lon + lon_inc);
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batch_sphere_lat_lon_vert(&pos_step, &nor_step, lat + lat_inc, lon);
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}
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}
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}
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BLI_assert(vbo_len == GWN_vertbuf_raw_used(&pos_step));
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BLI_assert(vbo_len == GWN_vertbuf_raw_used(&nor_step));
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return GWN_batch_create_ex(GWN_PRIM_LINES, vbo, NULL, GWN_BATCH_OWNS_VBO);
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}
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Gwn_Batch *GPU_batch_preset_sphere(int lod)
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{
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BLI_assert(lod >= 0 && lod <= 2);
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if (lod == 0) {
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return g_presets_3d.batch.sphere_low;
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}
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else if (lod == 1) {
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return g_presets_3d.batch.sphere_med;
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}
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else {
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return g_presets_3d.batch.sphere_high;
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}
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}
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Gwn_Batch *GPU_batch_preset_sphere_wire(int lod)
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{
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BLI_assert(lod >= 0 && lod <= 1);
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if (lod == 0) {
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return g_presets_3d.batch.sphere_wire_low;
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}
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else {
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return g_presets_3d.batch.sphere_wire_med;
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}
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}
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/** \} */
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void gpu_batch_presets_init(void)
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{
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if (g_presets_3d.format.attrib_ct == 0) {
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Gwn_VertFormat *format = &g_presets_3d.format;
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g_presets_3d.attr_id.pos = GWN_vertformat_attr_add(format, "pos", GWN_COMP_F32, 3, GWN_FETCH_FLOAT);
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g_presets_3d.attr_id.nor = GWN_vertformat_attr_add(format, "nor", GWN_COMP_F32, 3, GWN_FETCH_FLOAT);
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}
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/* Hard coded resolution */
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g_presets_3d.batch.sphere_low = batch_sphere(8, 16);
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g_presets_3d.batch.sphere_med = batch_sphere(16, 10);
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g_presets_3d.batch.sphere_high = batch_sphere(32, 24);
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g_presets_3d.batch.sphere_wire_low = batch_sphere_wire(6, 8);
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g_presets_3d.batch.sphere_wire_med = batch_sphere_wire(8, 16);
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}
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void gpu_batch_presets_exit(void)
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{
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GWN_batch_discard(g_presets_3d.batch.sphere_low);
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GWN_batch_discard(g_presets_3d.batch.sphere_med);
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GWN_batch_discard(g_presets_3d.batch.sphere_high);
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GWN_batch_discard(g_presets_3d.batch.sphere_wire_low);
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GWN_batch_discard(g_presets_3d.batch.sphere_wire_med);
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}
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