gg: add examples/gg/stars.v
Delyan Angelov
parent
21d5db43af
commit
3a357d9718
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@ -0,0 +1,134 @@
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module main
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import os
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import gg
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import gx
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import rand
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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 = 600
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max_stars = 5000
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max_v_letters = 5
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)
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struct Star {
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mut:
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x f32
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y f32
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z f32
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r f32
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g f32
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b f32
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}
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struct VLetter {
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mut:
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x f32
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y f32
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z f32
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w f32
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h f32
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angle f32
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dz f32
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dangle f32
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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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image gg.Image
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stars []Star
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v_letters []VLetter
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}
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fn main() {
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mut app := &App{
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gg: 0
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stars: []Star{len: max_stars}
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v_letters: []VLetter{len: max_v_letters}
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}
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app.gg = gg.new_context(
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bg_color: gx.black
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width: win_width
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height: win_height
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create_window: true
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window_title: 'Star Vield'
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frame_fn: frame
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init_fn: init_images
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user_data: app
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)
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for i in 0 .. max_stars {
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app.stars[i].x = rand.f32_in_range(-200.0, 200.0)
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app.stars[i].y = rand.f32_in_range(-200.0, 200.0)
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app.stars[i].z = rand.f32_in_range(-200.0, -100.0)
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app.stars[i].r = rand.f32_in_range(0.1, 1.0)
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app.stars[i].g = rand.f32_in_range(0.1, 1.0)
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app.stars[i].b = rand.f32_in_range(0.1, 1.0)
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}
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for i in 0 .. max_v_letters {
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app.v_letters[i].x = rand.f32_in_range(-20.0, 20.0)
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app.v_letters[i].y = rand.f32_in_range(-20.0, 20.0)
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app.v_letters[i].z = rand.f32_in_range(-5.0, -1.0)
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app.v_letters[i].w = rand.f32_in_range(5, 20)
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app.v_letters[i].h = app.v_letters[i].w
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app.v_letters[i].angle = rand.f32_in_range(0, 6.283184)
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app.v_letters[i].dangle = rand.f32_in_range(-0.05, 0.05)
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app.v_letters[i].dz = rand.f32_in_range(-0.1, -0.01)
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}
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app.gg.run()
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}
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fn init_images(mut app App) {
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app.image = app.gg.create_image(os.resource_abs_path('logo.png'))
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}
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fn frame(mut app App) {
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app.gg.begin()
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app.draw()
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app.gg.end()
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}
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// fn C.glPointSize(size f32)
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fn (mut app App) draw() {
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sgl.defaults()
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sgl.perspective(sgl.rad(90), 1.0, 1.0, 100.0)
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// C.glPointSize(3.0)
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sgl.begin_points()
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for i in 0 .. app.stars.len {
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s := app.stars[i]
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sgl.v3f_c3f(s.x, s.y, s.z, s.r, s.g, s.b)
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app.stars[i].z += 0.3
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if app.stars[i].z > -1.0 {
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app.stars[i].x = rand.f32_in_range(-200.0, 200.0)
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app.stars[i].y = rand.f32_in_range(-200.0, 200.0)
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app.stars[i].z = rand.f32_in_range(-200.0, -100.0)
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}
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}
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sgl.end()
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// ////
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for i in 0 .. app.v_letters.len {
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v := app.v_letters[i]
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sgl.defaults()
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sgl.perspective(sgl.rad(90), 1.0, 1.0, 100.0)
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sgl.rotate(v.angle, 0, 0, 1)
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app.gg.draw_image_3d(v.x, v.y, v.z, v.w, v.h, app.image)
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//
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app.v_letters[i].z += app.v_letters[i].dz
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app.v_letters[i].angle += app.v_letters[i].dangle
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if app.v_letters[i].z > -60.0 {
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app.v_letters[i].x += rand.f32_in_range(-0.05, 0.05)
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app.v_letters[i].y += rand.f32_in_range(-0.05, 0.05)
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}
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if app.v_letters[i].z < -95.0 {
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app.v_letters[i].h *= 0.8
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app.v_letters[i].w *= 0.8
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}
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if app.v_letters[i].z < -100.0 {
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app.v_letters[i].z = rand.f32_in_range(-5.0, -1.0)
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app.v_letters[i].h = 10.0
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app.v_letters[i].w = 10.0
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}
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}
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}
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@ -174,7 +174,7 @@ pub fn (ctx &Context) draw_image(x f32, y f32, width f32, height f32, img_ &Imag
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// TODO remove copy pasta, merge the functions
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pub fn (ctx &Context) draw_image_flipped(x f32, y f32, width f32, height f32, img_ &Image) {
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if img_.id >= ctx.image_cache.len {
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eprintln('gg: draw_image() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
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eprintln('gg: draw_image_flipped() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
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return
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}
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img := ctx.image_cache[img_.id] // fetch the image from cache
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@ -207,3 +207,34 @@ pub fn (ctx &Context) draw_image_by_id(x f32, y f32, width f32, height f32, id i
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img := ctx.image_cache[id]
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ctx.draw_image(x, y, width, height, img)
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}
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pub fn (ctx &Context) draw_image_3d(x f32, y f32, z f32, width f32, height f32, img_ &Image) {
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if img_.id >= ctx.image_cache.len {
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eprintln('gg: draw_image_3d() bad img id $img_.id (img cache len = $ctx.image_cache.len)')
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return
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}
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img := ctx.image_cache[img_.id] // fetch the image from cache
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if !img.simg_ok {
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return
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}
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u0 := f32(0.0)
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v0 := f32(0.0)
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u1 := f32(1.0)
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v1 := f32(1.0)
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x0 := f32(x) * ctx.scale
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y0 := f32(y) * ctx.scale
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x1 := f32(x + width) * ctx.scale
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y1 := f32(y + height) * ctx.scale
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//
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sgl.load_pipeline(ctx.timage_pip)
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sgl.enable_texture()
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sgl.texture(img.simg)
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sgl.begin_quads()
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sgl.c4b(255, 255, 255, 255)
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sgl.v3f_t2f(x0, y0, z, u0, v0)
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sgl.v3f_t2f(x1, y0, z, u1, v0)
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sgl.v3f_t2f(x1, y1, z, u1, v1)
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sgl.v3f_t2f(x0, y1, z, u0, v1)
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sgl.end()
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sgl.disable_texture()
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}
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