298 lines
8.1 KiB
V
298 lines
8.1 KiB
V
/**********************************************************************
|
|
*
|
|
* .obj loader
|
|
*
|
|
* Copyright (c) 2021 Dario Deledda. All rights reserved.
|
|
* Use of this source code is governed by an MIT license
|
|
* that can be found in the LICENSE file.
|
|
*
|
|
* TODO:
|
|
**********************************************************************/
|
|
module obj
|
|
|
|
import sokol.gfx
|
|
import gg.m4
|
|
import math
|
|
import stbi
|
|
|
|
/******************************************************************************
|
|
* Texture functions
|
|
******************************************************************************/
|
|
pub fn create_texture(w int, h int, buf &byte) gfx.Image {
|
|
sz := w * h * 4
|
|
mut img_desc := gfx.ImageDesc{
|
|
width: w
|
|
height: h
|
|
num_mipmaps: 0
|
|
min_filter: .linear
|
|
mag_filter: .linear
|
|
// usage: .dynamic
|
|
wrap_u: .clamp_to_edge
|
|
wrap_v: .clamp_to_edge
|
|
label: &byte(0)
|
|
d3d11_texture: 0
|
|
}
|
|
// comment if .dynamic is enabled
|
|
img_desc.data.subimage[0][0] = gfx.Range{
|
|
ptr: buf
|
|
size: usize(sz)
|
|
}
|
|
|
|
sg_img := gfx.make_image(&img_desc)
|
|
return sg_img
|
|
}
|
|
|
|
pub fn destroy_texture(sg_img gfx.Image) {
|
|
gfx.destroy_image(sg_img)
|
|
}
|
|
|
|
pub fn load_texture(file_name string) gfx.Image {
|
|
buffer := read_bytes_from_file(file_name)
|
|
stbi.set_flip_vertically_on_load(true)
|
|
img := stbi.load_from_memory(buffer.data, buffer.len) or {
|
|
eprintln('Texure file: [$file_name] ERROR!')
|
|
exit(0)
|
|
}
|
|
res := create_texture(int(img.width), int(img.height), img.data)
|
|
img.free()
|
|
return res
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Pipeline
|
|
******************************************************************************/
|
|
pub fn (mut obj_part ObjPart) create_pipeline(in_part []int, shader gfx.Shader, texture gfx.Image) Render_data {
|
|
mut res := Render_data{}
|
|
obj_buf := obj_part.get_buffer(in_part)
|
|
res.n_vert = obj_buf.n_vertex
|
|
res.material = obj_part.part[in_part[0]].material
|
|
|
|
// vertex buffer
|
|
mut vert_buffer_desc := gfx.BufferDesc{
|
|
label: 0
|
|
}
|
|
unsafe { C.memset(&vert_buffer_desc, 0, sizeof(vert_buffer_desc)) }
|
|
|
|
vert_buffer_desc.size = usize(obj_buf.vbuf.len * int(sizeof(Vertex_pnct)))
|
|
vert_buffer_desc.data = gfx.Range{
|
|
ptr: obj_buf.vbuf.data
|
|
size: usize(obj_buf.vbuf.len * int(sizeof(Vertex_pnct)))
|
|
}
|
|
|
|
vert_buffer_desc.@type = .vertexbuffer
|
|
vert_buffer_desc.label = 'vertbuf_part_${in_part:03}'.str
|
|
vbuf := gfx.make_buffer(&vert_buffer_desc)
|
|
|
|
// index buffer
|
|
mut index_buffer_desc := gfx.BufferDesc{
|
|
label: 0
|
|
}
|
|
unsafe { C.memset(&index_buffer_desc, 0, sizeof(index_buffer_desc)) }
|
|
|
|
index_buffer_desc.size = usize(obj_buf.ibuf.len * int(sizeof(u32)))
|
|
index_buffer_desc.data = gfx.Range{
|
|
ptr: obj_buf.ibuf.data
|
|
size: usize(obj_buf.ibuf.len * int(sizeof(u32)))
|
|
}
|
|
|
|
index_buffer_desc.@type = .indexbuffer
|
|
index_buffer_desc.label = 'indbuf_part_${in_part:03}'.str
|
|
ibuf := gfx.make_buffer(&index_buffer_desc)
|
|
|
|
mut pipdesc := gfx.PipelineDesc{}
|
|
unsafe { C.memset(&pipdesc, 0, sizeof(pipdesc)) }
|
|
pipdesc.layout.buffers[0].stride = int(sizeof(Vertex_pnct))
|
|
|
|
// the constants [C.ATTR_vs_a_Position, C.ATTR_vs_a_Color, C.ATTR_vs_a_Texcoord0] are generated by sokol-shdc
|
|
pipdesc.layout.attrs[C.ATTR_vs_a_Position].format = .float3 // x,y,z as f32
|
|
pipdesc.layout.attrs[C.ATTR_vs_a_Normal].format = .float3 // x,y,z as f32
|
|
pipdesc.layout.attrs[C.ATTR_vs_a_Color].format = .ubyte4n // color as u32
|
|
pipdesc.layout.attrs[C.ATTR_vs_a_Texcoord0].format = .float2 // u,v as f32
|
|
// pipdesc.layout.attrs[C.ATTR_vs_a_Texcoord0].format = .short2n // u,v as u16
|
|
pipdesc.index_type = .uint32
|
|
|
|
color_state := gfx.ColorState{
|
|
blend: gfx.BlendState{
|
|
enabled: true
|
|
src_factor_rgb: .src_alpha
|
|
dst_factor_rgb: .one_minus_src_alpha
|
|
}
|
|
}
|
|
pipdesc.colors[0] = color_state
|
|
|
|
pipdesc.depth = gfx.DepthState{
|
|
write_enabled: true
|
|
compare: .less_equal
|
|
}
|
|
pipdesc.cull_mode = .front
|
|
|
|
pipdesc.label = 'pip_part_${in_part:03}'.str
|
|
|
|
// shader
|
|
pipdesc.shader = shader
|
|
|
|
res.bind.vertex_buffers[0] = vbuf
|
|
res.bind.index_buffer = ibuf
|
|
res.bind.fs_images[C.SLOT_tex] = texture
|
|
res.pipeline = gfx.make_pipeline(&pipdesc)
|
|
// println('Buffers part [$in_part] init done!')
|
|
|
|
return res
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Render functions
|
|
******************************************************************************/
|
|
// agregate all the part by materials
|
|
pub fn (mut obj_part ObjPart) init_render_data(texture gfx.Image) {
|
|
// create shader
|
|
// One shader for all the model
|
|
shader := gfx.make_shader(C.gouraud_shader_desc(gfx.query_backend()))
|
|
|
|
mut part_dict := map[string][]int{}
|
|
for i, p in obj_part.part {
|
|
if p.faces.len > 0 {
|
|
part_dict[p.material] << i
|
|
}
|
|
}
|
|
obj_part.rend_data.clear()
|
|
// println("Material dict: ${obj_part.mat_map.keys()}")
|
|
|
|
for k, v in part_dict {
|
|
// println("$k => Parts $v")
|
|
|
|
mut txt := texture
|
|
|
|
if k in obj_part.mat_map {
|
|
mat_map := obj_part.mat[obj_part.mat_map[k]]
|
|
if 'map_Kd' in mat_map.maps {
|
|
file_name := mat_map.maps['map_Kd']
|
|
if file_name in obj_part.texture {
|
|
txt = obj_part.texture[file_name]
|
|
// println("Texture [${file_name}] => from CACHE")
|
|
} else {
|
|
txt = load_texture(file_name)
|
|
obj_part.texture[file_name] = txt
|
|
// println("Texture [${file_name}] => LOADED")
|
|
}
|
|
}
|
|
}
|
|
// key := obj_part.texture.keys()[0]
|
|
// obj_part.rend_data << obj_part.create_pipeline(v, shader, obj_part.texture[key])
|
|
obj_part.rend_data << obj_part.create_pipeline(v, shader, txt)
|
|
}
|
|
// println("Texture array len: ${obj_part.texture.len}")
|
|
// println("Calc bounding box.")
|
|
obj_part.calc_bbox()
|
|
println('init_render_data DONE!')
|
|
}
|
|
|
|
pub fn (obj_part ObjPart) bind_and_draw(rend_data_index int, in_data Shader_data) u32 {
|
|
// apply the pipline and bindings
|
|
mut part_render_data := obj_part.rend_data[rend_data_index]
|
|
|
|
// pass light position
|
|
mut tmp_fs_params := Tmp_fs_param{}
|
|
tmp_fs_params.ligth = in_data.fs_data.ligth
|
|
|
|
if part_render_data.material in obj_part.mat_map {
|
|
mat_index := obj_part.mat_map[part_render_data.material]
|
|
mat := obj_part.mat[mat_index]
|
|
|
|
// ambient
|
|
tmp_fs_params.ka = in_data.fs_data.ka
|
|
if 'Ka' in mat.ks {
|
|
tmp_fs_params.ka = mat.ks['Ka']
|
|
}
|
|
|
|
// specular
|
|
tmp_fs_params.ks = in_data.fs_data.ks
|
|
if 'Ks' in mat.ks {
|
|
tmp_fs_params.ks = mat.ks['Ks']
|
|
}
|
|
|
|
// specular exponent Ns
|
|
if 'Ns' in mat.ns {
|
|
tmp_fs_params.ks.e[3] = mat.ns['Ns'] / 1000.0
|
|
} else {
|
|
// defautl value is 10
|
|
tmp_fs_params.ks.e[3] = f32(10) / 1000.0
|
|
}
|
|
|
|
// diffuse
|
|
tmp_fs_params.kd = in_data.fs_data.kd
|
|
if 'Kd' in mat.ks {
|
|
tmp_fs_params.kd = mat.ks['Kd']
|
|
}
|
|
|
|
// alpha/transparency
|
|
if 'Tr' in mat.ns {
|
|
tmp_fs_params.kd.e[3] = mat.ns['Tr']
|
|
}
|
|
}
|
|
|
|
gfx.apply_pipeline(part_render_data.pipeline)
|
|
gfx.apply_bindings(part_render_data.bind)
|
|
|
|
vs_uniforms_range := gfx.Range{
|
|
ptr: in_data.vs_data
|
|
size: usize(in_data.vs_len)
|
|
}
|
|
fs_uniforms_range := gfx.Range{
|
|
ptr: unsafe { &tmp_fs_params }
|
|
size: usize(in_data.fs_len)
|
|
}
|
|
|
|
gfx.apply_uniforms(.vs, C.SLOT_vs_params, &vs_uniforms_range)
|
|
gfx.apply_uniforms(.fs, C.SLOT_fs_params, &fs_uniforms_range)
|
|
gfx.draw(0, int(part_render_data.n_vert), 1)
|
|
return part_render_data.n_vert
|
|
}
|
|
|
|
pub fn (obj_part ObjPart) bind_and_draw_all(in_data Shader_data) u32 {
|
|
mut n_vert := u32(0)
|
|
// println("Parts: ${obj_part.rend_data.len}")
|
|
for i, _ in obj_part.rend_data {
|
|
n_vert += obj_part.bind_and_draw(i, in_data)
|
|
}
|
|
return n_vert
|
|
}
|
|
|
|
pub fn (mut obj_part ObjPart) calc_bbox() {
|
|
obj_part.max = m4.Vec4{
|
|
e: [f32(-math.max_f32), -math.max_f32, -math.max_f32, 0]!
|
|
}
|
|
obj_part.min = m4.Vec4{
|
|
e: [f32(math.max_f32), math.max_f32, math.max_f32, 0]!
|
|
}
|
|
for v in obj_part.v {
|
|
if v.e[0] > obj_part.max.e[0] {
|
|
obj_part.max.e[0] = v.e[0]
|
|
}
|
|
if v.e[1] > obj_part.max.e[1] {
|
|
obj_part.max.e[1] = v.e[1]
|
|
}
|
|
if v.e[2] > obj_part.max.e[2] {
|
|
obj_part.max.e[2] = v.e[2]
|
|
}
|
|
|
|
if v.e[0] < obj_part.min.e[0] {
|
|
obj_part.min.e[0] = v.e[0]
|
|
}
|
|
if v.e[1] < obj_part.min.e[1] {
|
|
obj_part.min.e[1] = v.e[1]
|
|
}
|
|
if v.e[2] < obj_part.min.e[2] {
|
|
obj_part.min.e[2] = v.e[2]
|
|
}
|
|
}
|
|
val1 := obj_part.max.mod3()
|
|
val2 := obj_part.min.mod3()
|
|
if val1 > val2 {
|
|
obj_part.radius = f32(val1)
|
|
} else {
|
|
obj_part.radius = f32(val2)
|
|
}
|
|
// println("BBox: ${obj_part.min} <=> ${obj_part.max}\nRadius: ${obj_part.radius}")
|
|
}
|