v/examples/sokol/06_obj_viewer/obj/struct.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 gg.m4

// part struct mantain the fae indexes list
pub struct Part {
pub mut:
	faces     [][][3]int // v n t index order, if -1 not available
	name      string
	material  string
}

// materias struct, all Ks and Ns are stored as maps of string
pub struct Material {
pub mut:
	name     string
	ks       map[string]m4.Vec4
	ns       map[string]f32
	maps     map[string]string
}

// render data used for the rendering
pub struct Render_data{
pub mut:
	pipeline C.sg_pipeline
	bind     C.sg_bindings
	n_vert   u32
	material string
}

// base object parts struct
pub struct ObjPart {
pub mut:
	v    []m4.Vec4  // position
	vn   []m4.Vec4  // normals
	vp   []m4.Vec4  // vertex params
	vt   []m4.Vec4  // textures
	
	name    string
	part    []Part                // parts of the ObjPart
	mat     []Material            // list of the materials of the ObjPart
	mat_map map[string]int        // maping material name to its material index
	texture map[string]C.sg_image // GPU loaded texture map
	material_file string          // .mtl file name for the .obj
		
	rend_data []Render_data       // render data used for the rendering
	
	t_m  m4.Mat4 = m4.unit_m4() // transform matrix for this ObjPart
	//child []ObjPart           // childs
	
	// stats
	min    m4.Vec4   // min 3d position in the ObjPart
	max    m4.Vec4   // max 3d position in the ObjPart
	radius f32       // bounding circle radius of the ObjPart
}

// used in to pass the matrices to the shader
pub struct Mats {
pub mut:
	mv   m4.Mat4
	mvp  m4.Mat4
	nm   m4.Mat4
}

// data passed to the vertex shader
pub struct Tmp_vs_param {
pub mut:
	mv m4.Mat4
	mvp m4.Mat4
	nm  m4.Mat4
}

// data passed to the pixel shader
pub struct Tmp_fs_param {
pub mut:
	ligth m4.Vec4
	ka    m4.Vec4 = m4.Vec4{e:[f32(0.1), 0.0, 0.0, 1.0]!}
	kd    m4.Vec4 = m4.Vec4{e:[f32(0.5), 0.5, 0.5, 1.0]!}
	ks    m4.Vec4 = m4.Vec4{e:[f32(1.0), 1.0, 1.0, 1.0]!}
}

// shader data for the rendering
pub struct Shader_data {
pub mut:
	vs_data &Tmp_vs_param
	vs_len  int
	fs_data &Tmp_fs_param
	fs_len  int
}