quakeforge/libs/models/alias/vulkan_model_alias.c

/*
	vulkan_model_alais.c

	Alias model processing for Vulkan

	Copyright (C) 2021 Bill Currie <bill@taniwha.org>

	Author: Bill Currie <bill@taniwha.org>
	Date: 2021/1/24

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include <stdlib.h>

#include "QF/va.h"

#include "QF/modelgen.h"
#include "QF/vid.h"
#include "QF/Vulkan/qf_alias.h"
#include "QF/Vulkan/qf_texture.h"
#include "QF/Vulkan/buffer.h"
#include "QF/Vulkan/device.h"
#include "QF/Vulkan/instance.h"
#include "QF/Vulkan/staging.h"

#include "mod_internal.h"
#include "r_internal.h"
#include "vid_vulkan.h"

static vec3_t vertex_normals[NUMVERTEXNORMALS] = {
#include "anorms.h"
};

static void
skin_clear (int skin_offset, aliashdr_t *hdr, vulkan_ctx_t *ctx)
{
	aliasskin_t *skin = (aliasskin_t *) ((byte *) hdr + skin_offset);
	Vulkan_UnloadTex (ctx, skin->tex);
	if (skin->glow) {
		Vulkan_UnloadTex (ctx, skin->glow);
	}
	if (skin->colora) {
		Vulkan_UnloadTex (ctx, skin->colora);
	}
	if (skin->colorb) {
		Vulkan_UnloadTex (ctx, skin->colorb);
	}
}

static void
vulkan_alias_clear (model_t *m, void *data)
{
	vulkan_ctx_t *ctx = data;
	qfv_device_t *device = ctx->device;
	qfv_devfuncs_t *dfunc = device->funcs;
	aliashdr_t *hdr;
	qfv_alias_mesh_t *mesh;

	m->needload = true;	//FIXME is this right?
	if (!(hdr = m->aliashdr)) {
		hdr = Cache_Get (&m->cache);
	}
	mesh = (qfv_alias_mesh_t *) ((byte *) hdr + hdr->commands);
	dfunc->vkDestroyBuffer (device->dev, mesh->vertex_buffer, 0);
	dfunc->vkDestroyBuffer (device->dev, mesh->uv_buffer, 0);
	dfunc->vkDestroyBuffer (device->dev, mesh->index_buffer, 0);
	dfunc->vkFreeMemory (device->dev, mesh->memory, 0);

	__auto_type skins = (maliasskindesc_t *) ((byte *) hdr + hdr->skindesc);
	for (int i = 0; i < hdr->mdl.numskins; i++) {
		if (skins[i].type == ALIAS_SKIN_GROUP) {
			__auto_type group = (maliasskingroup_t *)
								((byte *) hdr + skins[i].skin);
			for (int j = 0; j < group->numskins; j++) {
				skin_clear (group->skindescs[j].skin, hdr, ctx);
			}
		} else {
			skin_clear (skins[i].skin, hdr, ctx);
		}
	}
}

void *
Vulkan_Mod_LoadSkin (byte *skinpix, int skinsize, int snum, int gnum,
				     qboolean group, maliasskindesc_t *skindesc,
					 vulkan_ctx_t *ctx)
{
	aliasskin_t *skin;
	byte       *tskin;
	int         w, h;

	skin = Hunk_Alloc (sizeof (aliasskin_t));
	skindesc->skin = (byte *) skin - (byte *) pheader;//FIXME pheader global
	//FIXME move all skins into arrays(?)
	w = pheader->mdl.skinwidth;
	h = pheader->mdl.skinheight;
	tskin = malloc (2 * skinsize);
	memcpy (tskin, skinpix, skinsize);
	Mod_FloodFillSkin (tskin, w, h);

	tex_t skin_tex = {w, h, tex_palette, 1, vid.palette, tskin + skinsize};
	if (Mod_CalcFullbright (tskin, tskin + skinsize, skinsize)) {
		skin->glow = Vulkan_LoadTex (ctx, &skin_tex, 1);
		Mod_ClearFullbright (tskin, tskin, skinsize);
	}
	if (Skin_CalcTopColors (tskin, tskin + skinsize, skinsize)) {
		skin->colora = Vulkan_LoadTex (ctx, &skin_tex, 1);
		Skin_ClearTopColors (tskin, tskin, skinsize);
	}
	if (Skin_CalcBottomColors (tskin, tskin + skinsize, skinsize)) {
		skin->colorb = Vulkan_LoadTex (ctx, &skin_tex, 1);
		Skin_ClearBottomColors (tskin, tskin, skinsize);
	}
	skin_tex.data = tskin;
	skin->tex = Vulkan_LoadTex (ctx, &skin_tex, 1);

	free (tskin);

	return skinpix + skinsize;
}

void
Vulkan_Mod_FinalizeAliasModel (model_t *m, aliashdr_t *hdr, vulkan_ctx_t *ctx)
{
	m->clear = vulkan_alias_clear;
	m->data = ctx;
}

void
Vulkan_Mod_LoadExternalSkins (model_t *mod, vulkan_ctx_t *ctx)
{
}

static size_t
get_buffer_size (qfv_device_t *device, VkBuffer buffer)
{
	qfv_devfuncs_t *dfunc = device->funcs;
	size_t      size;
	size_t      align;

	VkMemoryRequirements requirements;
	dfunc->vkGetBufferMemoryRequirements (device->dev, buffer, &requirements);
	size = requirements.size;
	align = requirements.alignment - 1;
	size = (size + align) & ~(align);
	return size;
}

void
Vulkan_Mod_MakeAliasModelDisplayLists (model_t *m, aliashdr_t *hdr, void *_m,
									   int _s, int extra, vulkan_ctx_t *ctx)
{
	qfv_device_t *device = ctx->device;
	qfv_devfuncs_t *dfunc = device->funcs;
	aliasvrt_t *verts;
	aliasuv_t  *uv;
	trivertx_t *pv;
	int        *indexmap;
	uint32_t   *indices;
	int         numverts;
	int         numtris;
	int         i, j;
	int         pose;
	vec3_t      pos;

	if (hdr->mdl.ident == HEADER_MDL16)
		VectorScale (hdr->mdl.scale, 1/256.0, hdr->mdl.scale);

	numverts = hdr->mdl.numverts;
	numtris = hdr->mdl.numtris;

	// initialize indexmap to -1 (unduplicated). any other value indicates
	// both that the vertex has been duplicated and the index of the
	// duplicate vertex.
	indexmap = malloc (numverts * sizeof (int));
	memset (indexmap, -1, numverts * sizeof (int));

	// check for onseam verts, and duplicate any that are associated with
	// back-facing triangles
	for (i = 0; i < numtris; i++) {
		for (j = 0; j < 3; j++) {
			int         vind = triangles.a[i].vertindex[j];
			if (stverts.a[vind].onseam && !triangles.a[i].facesfront) {
				// duplicate the vertex if it has not alreaddy been
				// duplicated
				if (indexmap[vind] == -1) {
					indexmap[vind] = numverts++;
				}
			}
		}
	}

	// we now know exactly how many vertices we need, so built the vertex
	// and index data arrays
	// The layout is:
	//    vbuf:{vertex, normal} * (numposes * numverts)
	//    uvbuf:{uv} * (numverts)
	//    ibuf:{index} * (numtris * 3)
	// numverts includes the duplicated seam vertices.
	// The vertex buffer will be bound with various offsets based on the
	// current and previous pose, uvbuff "statically" bound as uvs are not
	// animated by pose, and the same for ibuf: indices will never change for
	// the mesh
	size_t      vert_count = numverts * hdr->numposes;
	size_t      vert_size = vert_count * sizeof (aliasvrt_t);
	size_t      uv_size = numverts * sizeof (aliasuv_t);
	size_t      ind_size = 3 * numtris * sizeof (uint32_t);

	VkBuffer    vbuff = QFV_CreateBuffer (device, vert_size,
										  VK_BUFFER_USAGE_TRANSFER_DST_BIT
										  | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT);
	VkBuffer    uvbuff = QFV_CreateBuffer (device, uv_size,
										   VK_BUFFER_USAGE_TRANSFER_DST_BIT
										   | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT);
	VkBuffer    ibuff = QFV_CreateBuffer (device, ind_size,
										  VK_BUFFER_USAGE_TRANSFER_DST_BIT
										  | VK_BUFFER_USAGE_INDEX_BUFFER_BIT);
	size_t      voffs = 0;
	size_t      uvoffs = voffs + get_buffer_size (device, vbuff);
	size_t      ioffs = uvoffs + get_buffer_size (device, uvbuff);
	size_t      buff_size = ioffs + get_buffer_size (device, ibuff);
	VkDeviceMemory mem;
	mem = QFV_AllocBufferMemory (device, vbuff,
								 VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
								 buff_size, 0);
	QFV_BindBufferMemory (device, vbuff, mem, voffs);
	QFV_BindBufferMemory (device, uvbuff, mem, uvoffs);
	QFV_BindBufferMemory (device, ibuff, mem, ioffs);

	qfv_stagebuf_t *stage = QFV_CreateStagingBuffer (device, buff_size,
													  ctx->cmdpool);
	qfv_packet_t *packet = QFV_PacketAcquire (stage);
	verts = QFV_PacketExtend (packet, vert_size);
	uv = QFV_PacketExtend (packet, uv_size);
	indices = QFV_PacketExtend (packet, ind_size);

	// populate the uvs, duplicating and shifting any that are on the seam
	// and associated with back-facing triangles (marked by non-negative
	// indexmap entry).
	// the s coordinate is shifted right by half the skin width.
	for (i = 0; i < hdr->mdl.numverts; i++) {
		int         vind = indexmap[i];
		uv[i].u = (float) stverts.a[i].s / hdr->mdl.skinwidth;
		uv[i].v = (float) stverts.a[i].t / hdr->mdl.skinheight;
		if (vind != -1) {
			uv[vind] = uv[i];
			uv[vind].u += 0.5;
		}
	}

	// poputlate the vertex position and normal data, duplicating for
	// back-facing on-seam verts (indicated by non-negative indexmap entry)
	for (i = 0, pose = 0; i < hdr->numposes; i++, pose += numverts) {
		for (j = 0; j < hdr->mdl.numverts; j++) {
			pv = &poseverts.a[i][j];
			if (extra) {
				VectorMultAdd (pv[hdr->mdl.numverts].v, 256, pv->v, pos);
			} else {
				VectorCopy (pv->v, pos);
			}
			VectorCompMultAdd (hdr->mdl.scale_origin, hdr->mdl.scale,
							   pos, verts[pose + j].vertex);
			verts[pose + j].vertex[3] = 1;
			VectorCopy (vertex_normals[pv->lightnormalindex],
						verts[pose + j].normal);
			verts[pose + j].normal[3] = 0;
			// duplicate on-seam vert associated with back-facing triangle
			if (indexmap[j] != -1) {
				verts[pose + indexmap[j]] = verts[pose + j];
			}
		}
	}

	// now build the indices for DrawElements
	for (i = 0; i < numtris; i++) {
		for (j = 0; j < 3; j++) {
			int         vind = triangles.a[i].vertindex[j];
			if (stverts.a[vind].onseam && !triangles.a[i].facesfront) {
				vind = indexmap[vind];
			}
			indices[3 * i + j] = vind;
		}
	}
	// finished with indexmap
	free (indexmap);

	hdr->poseverts = numverts;

	VkBufferMemoryBarrier wr_barriers[] = {
		{	VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER, 0,
			0, VK_ACCESS_TRANSFER_WRITE_BIT,
			VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED,
			vbuff, 0, vert_size},
		{	VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER, 0,
			0, VK_ACCESS_TRANSFER_WRITE_BIT,
			VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED,
			uvbuff, 0, uv_size},
		{	VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER, 0,
			0, VK_ACCESS_TRANSFER_WRITE_BIT,
			VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED,
			ibuff, 0, ind_size},
	};
	dfunc->vkCmdPipelineBarrier (packet->cmd,
								 VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
								 VK_PIPELINE_STAGE_TRANSFER_BIT,
								 0, 0, 0, 3, wr_barriers, 0, 0);
	VkBufferCopy copy_region[] = {
		{ packet->offset, 0, vert_size },
		{ packet->offset + vert_size, 0, uv_size },
		{ packet->offset + vert_size + uv_size, 0, ind_size },
	};
	dfunc->vkCmdCopyBuffer (packet->cmd, stage->buffer,
							vbuff, 1, &copy_region[0]);
	dfunc->vkCmdCopyBuffer (packet->cmd, stage->buffer,
							uvbuff, 1, &copy_region[1]);
	dfunc->vkCmdCopyBuffer (packet->cmd, stage->buffer,
							ibuff, 1, &copy_region[2]);
	VkBufferMemoryBarrier rd_barriers[] = {
		{	VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER, 0,
			VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
			VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED,
			vbuff, 0, vert_size },
		{	VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER, 0,
			VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
			VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED,
			uvbuff, 0, uv_size },
		{	VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER, 0,
			VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_INDEX_READ_BIT,
			VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED,
			ibuff, 0, ind_size },
	};
	dfunc->vkCmdPipelineBarrier (packet->cmd,
								 VK_PIPELINE_STAGE_TRANSFER_BIT,
								 VK_PIPELINE_STAGE_VERTEX_INPUT_BIT,
								 0, 0, 0, 3, rd_barriers, 0, 0);
	QFV_PacketSubmit (packet);
	QFV_DestroyStagingBuffer (stage);

	qfv_alias_mesh_t *mesh = Hunk_Alloc (sizeof (qfv_alias_mesh_t));
	mesh->vertex_buffer = vbuff;
	mesh->uv_buffer = uvbuff;
	mesh->index_buffer = ibuff;
	mesh->memory = mem;
	hdr->commands = (byte *) mesh - (byte *) hdr;
}