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examples: add support for transparency / opacity / alpha in particle example (#6488)

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This commit is contained in:
Larpon
2020-09-28 06:14:15 +02:00
committed by GitHub
parent 06cade6c31
commit 0e2f267805
3 changed files with 15 additions and 7 deletions
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10
examples/sokol/particles/particles.v
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@@ -31,6 +31,7 @@ mut:
frame i64
last i64
ps particle.System
alpha_pip C.sgl_pipeline
}
fn (mut a App) init() {
@@ -66,16 +67,24 @@ fn (mut a App) run() {
}
fn (a App) draw() {
sgl.load_pipeline(a.alpha_pip)
a.ps.draw()
}
fn init(user_data voidptr) {
mut app := &App(user_data)
desc := sapp.create_desc()
gfx.setup(&desc)
sgl_desc := C.sgl_desc_t{
max_vertices: 50 * 65536
}
sgl.setup(&sgl_desc)
mut pipdesc := C.sg_pipeline_desc{}
unsafe {C.memset(&pipdesc, 0, sizeof(pipdesc))}
pipdesc.blend.enabled = true
pipdesc.blend.src_factor_rgb = C.SG_BLENDFACTOR_SRC_ALPHA
pipdesc.blend.dst_factor_rgb = C.SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA
app.alpha_pip = sgl.make_pipeline(&pipdesc)
}
fn cleanup(user_data voidptr) {
@@ -93,6 +102,7 @@ fn frame(user_data voidptr) {
app.ps.update(dt)
draw(app)
gfx.begin_default_pass(&app.pass_action, app.width, app.height)
sgl.default_pipeline()
sgl.draw()
gfx.end_pass()
gfx.commit()