examples: 3d cube sokol example (#8327)
penguindark
GitHub
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3dae3f786d
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/**********************************************************************
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*
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* Sokol 3d cube demo
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*
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* Copyright (c) 2021 Dario Deledda. All rights reserved.
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* Use of this source code is governed by an MIT license
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* that can be found in the LICENSE file.
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*
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* TODO:
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* - add instancing
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* - add an exampel with shaders
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**********************************************************************/
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import gg
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import gx
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import math
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import sokol.sapp
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import sokol.gfx
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import sokol.sgl
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const (
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win_width = 800
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win_height = 800
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bg_color = gx.white
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)
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struct App {
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mut:
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gg &gg.Context
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pip_3d C.sgl_pipeline
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texture C.sg_image
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init_flag bool
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frame_count int
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mouse_x int = -1
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mouse_y int = -1
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}
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/******************************************************************************
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*
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* Texture functions
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*
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******************************************************************************/
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fn create_texture(w int, h int, buf byteptr) C.sg_image{
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sz := w * h * 4
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mut img_desc := C.sg_image_desc{
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width: w
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height: h
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num_mipmaps: 0
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min_filter: .linear
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mag_filter: .linear
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//usage: .dynamic
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wrap_u: .clamp_to_edge
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wrap_v: .clamp_to_edge
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label: &byte(0)
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d3d11_texture: 0
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}
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// commen if .dynamic is enabled
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img_desc.content.subimage[0][0] = C.sg_subimage_content{
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ptr: buf
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size: sz
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}
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sg_img := C.sg_make_image(&img_desc)
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return sg_img
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}
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fn destroy_texture(sg_img C.sg_image){
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C.sg_destroy_image(sg_img)
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}
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// Use only if usage: .dynamic is enabled
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fn update_text_texture(sg_img C.sg_image, w int, h int, buf byteptr){
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sz := w * h * 4
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mut tmp_sbc := C.sg_image_content{}
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tmp_sbc.subimage[0][0] = C.sg_subimage_content {
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ptr: buf
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size: sz
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}
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C.sg_update_image(sg_img, &tmp_sbc)
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}
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/******************************************************************************
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*
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* Draw functions
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*
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******************************************************************************/
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fn draw_triangle() {
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sgl.defaults()
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sgl.begin_triangles()
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sgl.v2f_c3b( 0.0, 0.5, 255, 0, 0)
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sgl.v2f_c3b(-0.5, -0.5, 0, 0, 255)
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sgl.v2f_c3b( 0.5, -0.5, 0, 255, 0)
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sgl.end()
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}
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// vertex specification for a cube with colored sides and texture coords
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fn cube() {
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sgl.begin_quads()
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// edge color
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sgl.c3f(1.0, 0.0, 0.0)
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// edge coord
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// x,y,z, texture cord: u,v
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sgl.v3f_t2f(-1.0, 1.0, -1.0, -1.0, 1.0)
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sgl.v3f_t2f( 1.0, 1.0, -1.0, 1.0, 1.0)
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sgl.v3f_t2f( 1.0, -1.0, -1.0, 1.0, -1.0)
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sgl.v3f_t2f(-1.0, -1.0, -1.0, -1.0, -1.0)
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sgl.c3f(0.0, 1.0, 0.0)
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sgl.v3f_t2f(-1.0, -1.0, 1.0, -1.0, 1.0)
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sgl.v3f_t2f( 1.0, -1.0, 1.0, 1.0, 1.0)
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sgl.v3f_t2f( 1.0, 1.0, 1.0, 1.0, -1.0)
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sgl.v3f_t2f(-1.0, 1.0, 1.0, -1.0, -1.0)
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sgl.c3f(0.0, 0.0, 1.0)
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sgl.v3f_t2f(-1.0, -1.0, 1.0, -1.0, 1.0)
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sgl.v3f_t2f(-1.0, 1.0, 1.0, 1.0, 1.0)
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sgl.v3f_t2f(-1.0, 1.0, -1.0, 1.0, -1.0)
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sgl.v3f_t2f(-1.0, -1.0, -1.0, -1.0, -1.0)
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sgl.c3f(1.0, 0.5, 0.0)
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sgl.v3f_t2f(1.0, -1.0, 1.0, -1.0, 1.0)
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sgl.v3f_t2f(1.0, -1.0, -1.0, 1.0, 1.0)
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sgl.v3f_t2f(1.0, 1.0, -1.0, 1.0, -1.0)
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sgl.v3f_t2f(1.0, 1.0, 1.0, -1.0, -1.0)
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sgl.c3f(0.0, 0.5, 1.0)
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sgl.v3f_t2f( 1.0, -1.0, -1.0, -1.0, 1.0)
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sgl.v3f_t2f( 1.0, -1.0, 1.0, 1.0, 1.0)
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sgl.v3f_t2f(-1.0, -1.0, 1.0, 1.0, -1.0)
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sgl.v3f_t2f(-1.0, -1.0, -1.0, -1.0, -1.0)
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sgl.c3f(1.0, 0.0, 0.5)
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sgl.v3f_t2f(-1.0, 1.0, -1.0, -1.0, 1.0)
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sgl.v3f_t2f(-1.0, 1.0, 1.0, 1.0, 1.0)
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sgl.v3f_t2f( 1.0, 1.0, 1.0, 1.0, -1.0)
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sgl.v3f_t2f( 1.0, 1.0, -1.0, -1.0, -1.0)
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sgl.end()
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}
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fn draw_cubes(app App) {
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rot := [f32(1.0)*(app.frame_count % 360), 0.5*f32(app.frame_count%360)]
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//rot := [f32(app.mouse_x), f32(app.mouse_y)]
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sgl.defaults()
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sgl.load_pipeline(app.pip_3d)
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sgl.matrix_mode_projection()
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sgl.perspective(sgl.rad(45.0), 1.0, 0.1, 100.0)
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sgl.matrix_mode_modelview()
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sgl.translate(0.0, 0.0, -12.0)
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sgl.rotate(sgl.rad(rot[0]), 1.0, 0.0, 0.0)
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sgl.rotate(sgl.rad(rot[1]), 0.0, 1.0, 0.0)
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cube()
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sgl.push_matrix()
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sgl.translate(0.0, 0.0, 3.0)
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sgl.scale(0.5, 0.5, 0.5)
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sgl.rotate(-2.0 * sgl.rad(rot[0]), 1.0, 0.0, 0.0)
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sgl.rotate(-2.0 * sgl.rad(rot[1]), 0.0, 1.0, 0.0)
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cube()
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sgl.push_matrix()
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sgl.translate(0.0, 0.0, 3.0)
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sgl.scale(0.5, 0.5, 0.5)
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sgl.rotate(-3.0 * sgl.rad(2*rot[0]), 1.0, 0.0, 0.0)
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sgl.rotate(3.0 * sgl.rad(2*rot[1]), 0.0, 0.0, 1.0)
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cube()
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sgl.pop_matrix()
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sgl.pop_matrix()
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}
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fn cube_t(r f32,g f32,b f32) {
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sgl.begin_quads()
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// edge color
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sgl.c3f(r, g, b)
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// edge coord
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// x,y,z, texture cord: u,v
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sgl.v3f_t2f(-1.0, 1.0, -1.0, 0.0 , 0.25)
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sgl.v3f_t2f( 1.0, 1.0, -1.0, 0.25, 0.25)
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sgl.v3f_t2f( 1.0, -1.0, -1.0, 0.25, 0.0 )
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sgl.v3f_t2f(-1.0, -1.0, -1.0, 0.0 , 0.0 )
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sgl.c3f(r, g, b)
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sgl.v3f_t2f(-1.0, -1.0, 1.0, 0.0 , 0.25)
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sgl.v3f_t2f( 1.0, -1.0, 1.0, 0.25, 0.25)
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sgl.v3f_t2f( 1.0, 1.0, 1.0, 0.25, 0.0 )
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sgl.v3f_t2f(-1.0, 1.0, 1.0, 0.0 , 0.0 )
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sgl.c3f(r, g, b)
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sgl.v3f_t2f(-1.0, -1.0, 1.0, 0.0 , 0.25)
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sgl.v3f_t2f(-1.0, 1.0, 1.0, 0.25, 0.25)
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sgl.v3f_t2f(-1.0, 1.0, -1.0, 0.25, 0.0 )
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sgl.v3f_t2f(-1.0, -1.0, -1.0, 0.0 , 0.0 )
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sgl.c3f(r, g, b)
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sgl.v3f_t2f(1.0, -1.0, 1.0, 0.0 , 0.25)
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sgl.v3f_t2f(1.0, -1.0, -1.0, 0.25, 0.25)
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sgl.v3f_t2f(1.0, 1.0, -1.0, 0.25, 0.0 )
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sgl.v3f_t2f(1.0, 1.0, 1.0, 0.0 , 0.0 )
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sgl.c3f(r, g, b)
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sgl.v3f_t2f( 1.0, -1.0, -1.0, 0.0 , 0.25)
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sgl.v3f_t2f( 1.0, -1.0, 1.0, 0.25, 0.25)
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sgl.v3f_t2f(-1.0, -1.0, 1.0, 0.25, 0.0 )
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sgl.v3f_t2f(-1.0, -1.0, -1.0, 0.0 , 0.0 )
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sgl.c3f(r, g, b)
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sgl.v3f_t2f(-1.0, 1.0, -1.0, 0.0 , 0.25)
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sgl.v3f_t2f(-1.0, 1.0, 1.0, 0.25, 0.25)
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sgl.v3f_t2f( 1.0, 1.0, 1.0, 0.25, 0.0 )
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sgl.v3f_t2f( 1.0, 1.0, -1.0, 0.0 , 0.0 )
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sgl.end()
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}
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fn draw_texture_cubes(app App) {
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rot := [f32(app.mouse_x), f32(app.mouse_y)]
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sgl.defaults()
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sgl.load_pipeline(app.pip_3d)
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sgl.enable_texture()
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sgl.texture(app.texture)
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sgl.matrix_mode_projection()
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sgl.perspective(sgl.rad(45.0), 1.0, 0.1, 100.0)
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sgl.matrix_mode_modelview()
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sgl.translate(0.0, 0.0, -12.0)
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sgl.rotate(sgl.rad(rot[0]), 1.0, 0.0, 0.0)
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sgl.rotate(sgl.rad(rot[1]), 0.0, 1.0, 0.0)
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cube_t(1,1,1)
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sgl.push_matrix()
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sgl.translate(0.0, 0.0, 3.0)
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sgl.scale(0.5, 0.5, 0.5)
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sgl.rotate(-2.0 * sgl.rad(rot[0]), 1.0, 0.0, 0.0)
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sgl.rotate(-2.0 * sgl.rad(rot[1]), 0.0, 1.0, 0.0)
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cube_t(1,1,1)
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sgl.push_matrix()
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sgl.translate(0.0, 0.0, 3.0)
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sgl.scale(0.5, 0.5, 0.5)
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sgl.rotate(-3.0 * sgl.rad(2*rot[0]), 1.0, 0.0, 0.0)
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sgl.rotate(3.0 * sgl.rad(2*rot[1]), 0.0, 0.0, 1.0)
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cube_t(1,1,1)
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sgl.pop_matrix()
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sgl.pop_matrix()
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sgl.disable_texture()
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}
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fn cube_field(app App){
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rot := [f32(app.mouse_x), f32(app.mouse_y)]
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xyz_sz := f32(2.0)
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field_size := 20
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sgl.defaults()
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sgl.load_pipeline(app.pip_3d)
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sgl.enable_texture()
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sgl.texture(app.texture)
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sgl.matrix_mode_projection()
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sgl.perspective(sgl.rad(45.0), 1.0, 0.1, 200.0)
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sgl.matrix_mode_modelview()
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sgl.translate(field_size, 0.0, -120.0)
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sgl.rotate(sgl.rad(rot[0]), 0.0, 1.0, 0.0)
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sgl.rotate(sgl.rad(rot[1]), 1.0, 0.0, 0.0)
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// draw field_size*field_size cubes
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for y in 0..field_size {
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for x in 0..field_size {
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sgl.push_matrix()
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z := f32(math.cos(f32(x*2)/field_size)*math.sin(f32(y*2)/field_size)*xyz_sz)*(xyz_sz*5)
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sgl.translate(x*xyz_sz, z, y*xyz_sz)
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cube_t(f32(f32(x)/field_size), f32(f32(y)/field_size),1)
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sgl.pop_matrix()
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}
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}
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sgl.disable_texture()
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}
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fn frame(mut app App) {
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dw := app.gg.width
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dh := app.gg.height
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ww := dh/2 /* not a bug */
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hh := dh/2
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x0 := dw/2 - hh
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//x1 := dw/2
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y0 := 0
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y1 := dh/2
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app.gg.begin()
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//sgl.defaults()
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// 2d triangle
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sgl.viewport(x0, y0, ww, hh, true)
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draw_triangle()
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// colored cubes with viewport
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sgl.viewport(x0, y1, ww, hh, true)
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draw_cubes(app)
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// textured cubed with viewport
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sgl.viewport(0, 0, dw, dh, true)
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draw_texture_cubes(app)
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// textured field of cubes with viewport
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sgl.viewport(0, 0, dw, dh, true)
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cube_field(app)
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app.frame_count++
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app.gg.end()
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}
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/******************************************************************************
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*
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* Init / Cleanup
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*
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******************************************************************************/
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fn my_init(mut app App) {
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app.init_flag = true
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// set max vertices,
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// for a large number of the same type of object it is better use the instances!!
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desc := sapp.create_desc()
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gfx.setup(&desc)
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sgl_desc := C.sgl_desc_t{
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max_vertices: 50 * 65536
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}
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sgl.setup(&sgl_desc)
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// 3d pipeline
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||||||
|
mut pipdesc := C.sg_pipeline_desc{}
|
||||||
|
unsafe {C.memset(&pipdesc, 0, sizeof(pipdesc))}
|
||||||
|
pipdesc.blend.enabled = true
|
||||||
|
pipdesc.blend.src_factor_rgb = gfx.BlendFactor(C.SG_BLENDFACTOR_SRC_ALPHA)
|
||||||
|
pipdesc.blend.dst_factor_rgb = gfx.BlendFactor(C.SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA)
|
||||||
|
pipdesc.depth_stencil = C.sg_depth_stencil_state{
|
||||||
|
depth_write_enabled: true
|
||||||
|
depth_compare_func : gfx.CompareFunc(C.SG_COMPAREFUNC_LESS_EQUAL)
|
||||||
|
}
|
||||||
|
pipdesc.rasterizer = C.sg_rasterizer_state {
|
||||||
|
cull_mode: .back
|
||||||
|
}
|
||||||
|
app.pip_3d = sgl.make_pipeline(&pipdesc)
|
||||||
|
|
||||||
|
// create chessboard texture 256*256 RGBA
|
||||||
|
w := 256
|
||||||
|
h := 256
|
||||||
|
sz := w * h * 4
|
||||||
|
tmp_txt := malloc(sz)
|
||||||
|
mut i := 0
|
||||||
|
for i < sz {
|
||||||
|
unsafe {
|
||||||
|
y := (i >> 0x8) >> 5 // 8 cell
|
||||||
|
x := (i & 0xFF) >> 5 // 8 cell
|
||||||
|
// upper left corner
|
||||||
|
if x==0 && y==0 {
|
||||||
|
tmp_txt[i ] = byte(0xFF)
|
||||||
|
tmp_txt[i+1] = byte(0)
|
||||||
|
tmp_txt[i+2] = byte(0)
|
||||||
|
tmp_txt[i+3] = byte(0xFF)
|
||||||
|
}
|
||||||
|
// low right corner
|
||||||
|
else if x==7 && y==7 {
|
||||||
|
tmp_txt[i ] = byte(0)
|
||||||
|
tmp_txt[i+1] = byte(0xFF)
|
||||||
|
tmp_txt[i+2] = byte(0)
|
||||||
|
tmp_txt[i+3] = byte(0xFF)
|
||||||
|
} else {
|
||||||
|
col := if ((x+y) & 1) == 1 {0xFF} else {0}
|
||||||
|
tmp_txt[i ] = byte(col) // red
|
||||||
|
tmp_txt[i+1] = byte(col) // green
|
||||||
|
tmp_txt[i+2] = byte(col) // blue
|
||||||
|
tmp_txt[i+3] = byte(0xFF) // alpha
|
||||||
|
}
|
||||||
|
i += 4
|
||||||
|
}
|
||||||
|
}
|
||||||
|
app.texture = create_texture(w, h, tmp_txt)
|
||||||
|
free(tmp_txt)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn cleanup(mut app App) {
|
||||||
|
gfx.shutdown()
|
||||||
|
}
|
||||||
|
|
||||||
|
/******************************************************************************
|
||||||
|
*
|
||||||
|
* event
|
||||||
|
*
|
||||||
|
******************************************************************************/
|
||||||
|
fn my_event_manager(mut ev sapp.Event, mut app App) {
|
||||||
|
if ev.typ == .mouse_move {
|
||||||
|
app.mouse_x = int(ev.mouse_x)
|
||||||
|
app.mouse_y = int(ev.mouse_y)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/******************************************************************************
|
||||||
|
*
|
||||||
|
* Main
|
||||||
|
*
|
||||||
|
******************************************************************************/
|
||||||
|
fn main(){
|
||||||
|
// App init
|
||||||
|
mut app := &App{
|
||||||
|
gg: 0
|
||||||
|
}
|
||||||
|
|
||||||
|
app.gg = gg.new_context({
|
||||||
|
width: win_width
|
||||||
|
height: win_height
|
||||||
|
use_ortho: true // This is needed for 2D drawing
|
||||||
|
create_window: true
|
||||||
|
window_title: '3D Cube Demo'
|
||||||
|
user_data: app
|
||||||
|
bg_color: bg_color
|
||||||
|
frame_fn: frame
|
||||||
|
init_fn: my_init
|
||||||
|
cleanup_fn: cleanup
|
||||||
|
event_fn: my_event_manager
|
||||||
|
})
|
||||||
|
|
||||||
|
app.gg.run()
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue