434 lines
11 KiB
V
434 lines
11 KiB
V
/**********************************************************************
|
|
*
|
|
* Sokol 3d cube demo
|
|
*
|
|
* 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:
|
|
* - add instancing
|
|
* - add an exampel with shaders
|
|
**********************************************************************/
|
|
import gg
|
|
import gx
|
|
import math
|
|
import sokol.sapp
|
|
import sokol.gfx
|
|
import sokol.sgl
|
|
|
|
const (
|
|
win_width = 800
|
|
win_height = 800
|
|
bg_color = gx.white
|
|
)
|
|
|
|
struct App {
|
|
mut:
|
|
gg &gg.Context
|
|
pip_3d C.sgl_pipeline
|
|
texture C.sg_image
|
|
init_flag bool
|
|
frame_count int
|
|
mouse_x int = -1
|
|
mouse_y int = -1
|
|
}
|
|
|
|
/******************************************************************************
|
|
*
|
|
* Texture functions
|
|
*
|
|
******************************************************************************/
|
|
fn create_texture(w int, h int, buf &u8) C.sg_image {
|
|
sz := w * h * 4
|
|
mut img_desc := C.sg_image_desc{
|
|
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
|
|
}
|
|
// commen if .dynamic is enabled
|
|
img_desc.data.subimage[0][0] = C.sg_range{
|
|
ptr: buf
|
|
size: size_t(sz)
|
|
}
|
|
|
|
sg_img := C.sg_make_image(&img_desc)
|
|
return sg_img
|
|
}
|
|
|
|
fn destroy_texture(sg_img C.sg_image) {
|
|
C.sg_destroy_image(sg_img)
|
|
}
|
|
|
|
// Use only if usage: .dynamic is enabled
|
|
fn update_text_texture(sg_img C.sg_image, w int, h int, buf &byte) {
|
|
sz := w * h * 4
|
|
mut tmp_sbc := C.sg_image_data{}
|
|
tmp_sbc.subimage[0][0] = C.sg_range{
|
|
ptr: buf
|
|
size: size_t(sz)
|
|
}
|
|
C.sg_update_image(sg_img, &tmp_sbc)
|
|
}
|
|
|
|
/******************************************************************************
|
|
*
|
|
* Draw functions
|
|
*
|
|
******************************************************************************/
|
|
fn draw_triangle() {
|
|
sgl.defaults()
|
|
sgl.begin_triangles()
|
|
sgl.v2f_c3b(0.0, 0.5, 255, 0, 0)
|
|
sgl.v2f_c3b(-0.5, -0.5, 0, 0, 255)
|
|
sgl.v2f_c3b(0.5, -0.5, 0, 255, 0)
|
|
sgl.end()
|
|
}
|
|
|
|
// vertex specification for a cube with colored sides and texture coords
|
|
fn cube() {
|
|
sgl.begin_quads()
|
|
// edge color
|
|
sgl.c3f(1.0, 0.0, 0.0)
|
|
// edge coord
|
|
// x,y,z, texture cord: u,v
|
|
sgl.v3f_t2f(-1.0, 1.0, -1.0, -1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, 1.0, -1.0, 1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, -1.0, -1.0, 1.0, -1.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, -1.0, -1.0, -1.0)
|
|
sgl.c3f(0.0, 1.0, 0.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, 1.0, -1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, -1.0, 1.0, 1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, 1.0, 1.0, 1.0, -1.0)
|
|
sgl.v3f_t2f(-1.0, 1.0, 1.0, -1.0, -1.0)
|
|
sgl.c3f(0.0, 0.0, 1.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, 1.0, -1.0, 1.0)
|
|
sgl.v3f_t2f(-1.0, 1.0, 1.0, 1.0, 1.0)
|
|
sgl.v3f_t2f(-1.0, 1.0, -1.0, 1.0, -1.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, -1.0, -1.0, -1.0)
|
|
sgl.c3f(1.0, 0.5, 0.0)
|
|
sgl.v3f_t2f(1.0, -1.0, 1.0, -1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, -1.0, -1.0, 1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, 1.0, -1.0, 1.0, -1.0)
|
|
sgl.v3f_t2f(1.0, 1.0, 1.0, -1.0, -1.0)
|
|
sgl.c3f(0.0, 0.5, 1.0)
|
|
sgl.v3f_t2f(1.0, -1.0, -1.0, -1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, -1.0, 1.0, 1.0, 1.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, 1.0, 1.0, -1.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, -1.0, -1.0, -1.0)
|
|
sgl.c3f(1.0, 0.0, 0.5)
|
|
sgl.v3f_t2f(-1.0, 1.0, -1.0, -1.0, 1.0)
|
|
sgl.v3f_t2f(-1.0, 1.0, 1.0, 1.0, 1.0)
|
|
sgl.v3f_t2f(1.0, 1.0, 1.0, 1.0, -1.0)
|
|
sgl.v3f_t2f(1.0, 1.0, -1.0, -1.0, -1.0)
|
|
sgl.end()
|
|
}
|
|
|
|
fn draw_cubes(app App) {
|
|
rot := [f32(1.0) * (app.frame_count % 360), 0.5 * f32(app.frame_count % 360)]
|
|
// rot := [f32(app.mouse_x), f32(app.mouse_y)]
|
|
|
|
sgl.defaults()
|
|
sgl.load_pipeline(app.pip_3d)
|
|
|
|
sgl.matrix_mode_projection()
|
|
sgl.perspective(sgl.rad(45.0), 1.0, 0.1, 100.0)
|
|
|
|
sgl.matrix_mode_modelview()
|
|
sgl.translate(0.0, 0.0, -12.0)
|
|
sgl.rotate(sgl.rad(rot[0]), 1.0, 0.0, 0.0)
|
|
sgl.rotate(sgl.rad(rot[1]), 0.0, 1.0, 0.0)
|
|
cube()
|
|
sgl.push_matrix()
|
|
sgl.translate(0.0, 0.0, 3.0)
|
|
sgl.scale(0.5, 0.5, 0.5)
|
|
sgl.rotate(-2.0 * sgl.rad(rot[0]), 1.0, 0.0, 0.0)
|
|
sgl.rotate(-2.0 * sgl.rad(rot[1]), 0.0, 1.0, 0.0)
|
|
cube()
|
|
sgl.push_matrix()
|
|
sgl.translate(0.0, 0.0, 3.0)
|
|
sgl.scale(0.5, 0.5, 0.5)
|
|
sgl.rotate(-3.0 * sgl.rad(2 * rot[0]), 1.0, 0.0, 0.0)
|
|
sgl.rotate(3.0 * sgl.rad(2 * rot[1]), 0.0, 0.0, 1.0)
|
|
cube()
|
|
sgl.pop_matrix()
|
|
sgl.pop_matrix()
|
|
}
|
|
|
|
fn cube_t(r f32, g f32, b f32) {
|
|
sgl.begin_quads()
|
|
// edge color
|
|
sgl.c3f(r, g, b)
|
|
// edge coord
|
|
// x,y,z, texture cord: u,v
|
|
sgl.v3f_t2f(-1.0, 1.0, -1.0, 0.0, 0.25)
|
|
sgl.v3f_t2f(1.0, 1.0, -1.0, 0.25, 0.25)
|
|
sgl.v3f_t2f(1.0, -1.0, -1.0, 0.25, 0.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, -1.0, 0.0, 0.0)
|
|
sgl.c3f(r, g, b)
|
|
sgl.v3f_t2f(-1.0, -1.0, 1.0, 0.0, 0.25)
|
|
sgl.v3f_t2f(1.0, -1.0, 1.0, 0.25, 0.25)
|
|
sgl.v3f_t2f(1.0, 1.0, 1.0, 0.25, 0.0)
|
|
sgl.v3f_t2f(-1.0, 1.0, 1.0, 0.0, 0.0)
|
|
sgl.c3f(r, g, b)
|
|
sgl.v3f_t2f(-1.0, -1.0, 1.0, 0.0, 0.25)
|
|
sgl.v3f_t2f(-1.0, 1.0, 1.0, 0.25, 0.25)
|
|
sgl.v3f_t2f(-1.0, 1.0, -1.0, 0.25, 0.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, -1.0, 0.0, 0.0)
|
|
sgl.c3f(r, g, b)
|
|
sgl.v3f_t2f(1.0, -1.0, 1.0, 0.0, 0.25)
|
|
sgl.v3f_t2f(1.0, -1.0, -1.0, 0.25, 0.25)
|
|
sgl.v3f_t2f(1.0, 1.0, -1.0, 0.25, 0.0)
|
|
sgl.v3f_t2f(1.0, 1.0, 1.0, 0.0, 0.0)
|
|
sgl.c3f(r, g, b)
|
|
sgl.v3f_t2f(1.0, -1.0, -1.0, 0.0, 0.25)
|
|
sgl.v3f_t2f(1.0, -1.0, 1.0, 0.25, 0.25)
|
|
sgl.v3f_t2f(-1.0, -1.0, 1.0, 0.25, 0.0)
|
|
sgl.v3f_t2f(-1.0, -1.0, -1.0, 0.0, 0.0)
|
|
sgl.c3f(r, g, b)
|
|
sgl.v3f_t2f(-1.0, 1.0, -1.0, 0.0, 0.25)
|
|
sgl.v3f_t2f(-1.0, 1.0, 1.0, 0.25, 0.25)
|
|
sgl.v3f_t2f(1.0, 1.0, 1.0, 0.25, 0.0)
|
|
sgl.v3f_t2f(1.0, 1.0, -1.0, 0.0, 0.0)
|
|
sgl.end()
|
|
}
|
|
|
|
fn draw_texture_cubes(app App) {
|
|
rot := [f32(app.mouse_x), f32(app.mouse_y)]
|
|
sgl.defaults()
|
|
sgl.load_pipeline(app.pip_3d)
|
|
|
|
sgl.enable_texture()
|
|
sgl.texture(app.texture)
|
|
|
|
sgl.matrix_mode_projection()
|
|
sgl.perspective(sgl.rad(45.0), 1.0, 0.1, 100.0)
|
|
|
|
sgl.matrix_mode_modelview()
|
|
sgl.translate(0.0, 0.0, -12.0)
|
|
sgl.rotate(sgl.rad(rot[0]), 1.0, 0.0, 0.0)
|
|
sgl.rotate(sgl.rad(rot[1]), 0.0, 1.0, 0.0)
|
|
cube_t(1, 1, 1)
|
|
sgl.push_matrix()
|
|
sgl.translate(0.0, 0.0, 3.0)
|
|
sgl.scale(0.5, 0.5, 0.5)
|
|
sgl.rotate(-2.0 * sgl.rad(rot[0]), 1.0, 0.0, 0.0)
|
|
sgl.rotate(-2.0 * sgl.rad(rot[1]), 0.0, 1.0, 0.0)
|
|
cube_t(1, 1, 1)
|
|
sgl.push_matrix()
|
|
sgl.translate(0.0, 0.0, 3.0)
|
|
sgl.scale(0.5, 0.5, 0.5)
|
|
sgl.rotate(-3.0 * sgl.rad(2 * rot[0]), 1.0, 0.0, 0.0)
|
|
sgl.rotate(3.0 * sgl.rad(2 * rot[1]), 0.0, 0.0, 1.0)
|
|
cube_t(1, 1, 1)
|
|
sgl.pop_matrix()
|
|
sgl.pop_matrix()
|
|
|
|
sgl.disable_texture()
|
|
}
|
|
|
|
fn cube_field(app App) {
|
|
rot := [f32(app.mouse_x), f32(app.mouse_y)]
|
|
xyz_sz := f32(2.0)
|
|
field_size := 20
|
|
|
|
sgl.defaults()
|
|
sgl.load_pipeline(app.pip_3d)
|
|
|
|
sgl.enable_texture()
|
|
sgl.texture(app.texture)
|
|
|
|
sgl.matrix_mode_projection()
|
|
sgl.perspective(sgl.rad(45.0), 1.0, 0.1, 200.0)
|
|
|
|
sgl.matrix_mode_modelview()
|
|
|
|
sgl.translate(field_size, 0.0, -120.0)
|
|
sgl.rotate(sgl.rad(rot[0]), 0.0, 1.0, 0.0)
|
|
sgl.rotate(sgl.rad(rot[1]), 1.0, 0.0, 0.0)
|
|
|
|
// draw field_size*field_size cubes
|
|
for y in 0 .. field_size {
|
|
for x in 0 .. field_size {
|
|
sgl.push_matrix()
|
|
z := f32(math.cos(f32(x * 2) / field_size) * math.sin(f32(y * 2) / field_size) * xyz_sz) * (xyz_sz * 5)
|
|
sgl.translate(x * xyz_sz, z, y * xyz_sz)
|
|
cube_t(f32(f32(x) / field_size), f32(f32(y) / field_size), 1)
|
|
sgl.pop_matrix()
|
|
}
|
|
}
|
|
sgl.disable_texture()
|
|
}
|
|
|
|
fn frame(mut app App) {
|
|
ws := gg.window_size_real_pixels()
|
|
ratio := f32(ws.width) / ws.height
|
|
dw := ws.width
|
|
dh := ws.height
|
|
ww := int(dh / 3) // not a bug
|
|
hh := int(dh / 3)
|
|
x0 := int(f32(dw) * 0.05)
|
|
// x1 := dw/2
|
|
y0 := 0
|
|
y1 := int(f32(dh) * 0.5)
|
|
|
|
app.gg.begin()
|
|
// sgl.defaults()
|
|
|
|
// 2d triangle
|
|
sgl.viewport(x0, y0, ww, hh, true)
|
|
draw_triangle()
|
|
|
|
// colored cubes with viewport
|
|
sgl.viewport(x0, y1, ww, hh, true)
|
|
draw_cubes(app)
|
|
|
|
// textured cubed with viewport
|
|
sgl.viewport(0, int(dh / 5), dw, int(dh * ratio), true)
|
|
draw_texture_cubes(app)
|
|
|
|
// textured field of cubes with viewport
|
|
sgl.viewport(0, int(dh / 5), dw, int(dh * ratio), true)
|
|
cube_field(app)
|
|
|
|
app.frame_count++
|
|
|
|
app.gg.end()
|
|
}
|
|
|
|
/******************************************************************************
|
|
*
|
|
* Init / Cleanup
|
|
*
|
|
******************************************************************************/
|
|
fn my_init(mut app App) {
|
|
app.init_flag = true
|
|
|
|
// set max vertices,
|
|
// for a large number of the same type of object it is better use the instances!!
|
|
desc := sapp.create_desc()
|
|
gfx.setup(&desc)
|
|
sgl_desc := C.sgl_desc_t{
|
|
max_vertices: 50 * 65536
|
|
}
|
|
sgl.setup(&sgl_desc)
|
|
|
|
// 3d pipeline
|
|
mut pipdesc := C.sg_pipeline_desc{}
|
|
unsafe { C.memset(&pipdesc, 0, sizeof(pipdesc)) }
|
|
|
|
color_state := C.sg_color_state{
|
|
blend: C.sg_blend_state{
|
|
enabled: true
|
|
src_factor_rgb: gfx.BlendFactor(C.SG_BLENDFACTOR_SRC_ALPHA)
|
|
dst_factor_rgb: gfx.BlendFactor(C.SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA)
|
|
}
|
|
}
|
|
pipdesc.colors[0] = color_state
|
|
|
|
pipdesc.depth = C.sg_depth_state{
|
|
write_enabled: true
|
|
compare: gfx.CompareFunc(C.SG_COMPAREFUNC_LESS_EQUAL)
|
|
}
|
|
pipdesc.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 := unsafe { 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
|
|
}
|
|
}
|
|
unsafe {
|
|
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 gg.Event, mut app App) {
|
|
if ev.typ == .mouse_move {
|
|
app.mouse_x = int(ev.mouse_x)
|
|
app.mouse_y = int(ev.mouse_y)
|
|
}
|
|
if ev.typ == .touches_began || ev.typ == .touches_moved {
|
|
if ev.num_touches > 0 {
|
|
touch_point := ev.touches[0]
|
|
app.mouse_x = int(touch_point.pos_x)
|
|
app.mouse_y = int(touch_point.pos_y)
|
|
}
|
|
}
|
|
}
|
|
|
|
/******************************************************************************
|
|
*
|
|
* Main
|
|
*
|
|
******************************************************************************/
|
|
// is needed for easier diagnostics on windows
|
|
[console]
|
|
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()
|
|
}
|