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

pull/6490/head
Larpon 2020-09-28 06:14:15 +02:00 committed by GitHub
parent 06cade6c31
commit 0e2f267805
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 15 additions and 7 deletions
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4
examples/sokol/particles/modules/particle/particle.v
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@ -27,7 +27,7 @@ fn remap(v, min, max, new_min, new_max f64) f64 {
return (((v - min) * (new_max - new_min)) / (max - min)) + new_min return (((v - min) * (new_max - new_min)) / (max - min)) + new_min
} }
// * Particle // Particle
pub struct Particle { pub struct Particle {
mut: mut:
location vec2.Vec2 location vec2.Vec2
@ -49,7 +49,7 @@ pub fn (mut p Particle) update(dt f64) {
p.color.r = p.color.r - 1 // byte(remap(p.life_time,0.0,p.life_time_init,0,p.color.r)) p.color.r = p.color.r - 1 // byte(remap(p.life_time,0.0,p.life_time_init,0,p.color.r))
p.color.g = p.color.g - 1 // byte(remap(p.life_time,0.0,p.life_time_init,0,p.color.g)) p.color.g = p.color.g - 1 // byte(remap(p.life_time,0.0,p.life_time_init,0,p.color.g))
p.color.b = p.color.b - 1 // byte(remap(p.life_time,0.0,p.life_time_init,0,p.color.b)) p.color.b = p.color.b - 1 // byte(remap(p.life_time,0.0,p.life_time_init,0,p.color.b))
// p.color.a = byte(remap(p.life_time,0.0,p.life_time_init,0,255)) p.color.a = byte(int(remap(p.life_time, 0.0, p.life_time_init, 0, 255))) - 10
} else { } else {
p.life_time = 0 p.life_time = 0
} }

8
examples/sokol/particles/modules/particle/system.v
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@ -46,12 +46,12 @@ pub fn (s System) draw() {
} }
pub fn (mut s System) reset() { pub fn (mut s System) reset() {
for i in 0..s.pool.len { for i in 0 .. s.pool.len {
mut p := s.pool[i] mut p := s.pool[i]
p.reset() p.reset()
p.life_time = 0 p.life_time = 0
} }
for i in 0..s.bin.len { for i in 0 .. s.bin.len {
mut p := s.pool[i] mut p := s.pool[i]
p.reset() p.reset()
p.life_time = 0 p.life_time = 0
@ -82,9 +82,7 @@ pub fn (mut s System) free() {
print(ptr_str(p) + ' ouch') print(ptr_str(p) + ' ouch')
continue continue
} }
unsafe { unsafe {free(p)}
free(p)
}
} }
s.pool.clear() s.pool.clear()
for p in s.bin { for p in s.bin {

10
examples/sokol/particles/particles.v
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@ -31,6 +31,7 @@ mut:
frame i64 frame i64
last i64 last i64
ps particle.System ps particle.System
alpha_pip C.sgl_pipeline
} }
fn (mut a App) init() { fn (mut a App) init() {
@ -66,16 +67,24 @@ fn (mut a App) run() {
} }
fn (a App) draw() { fn (a App) draw() {
sgl.load_pipeline(a.alpha_pip)
a.ps.draw() a.ps.draw()
} }
fn init(user_data voidptr) { fn init(user_data voidptr) {
mut app := &App(user_data)
desc := sapp.create_desc() desc := sapp.create_desc()
gfx.setup(&desc) gfx.setup(&desc)
sgl_desc := C.sgl_desc_t{ sgl_desc := C.sgl_desc_t{
max_vertices: 50 * 65536 max_vertices: 50 * 65536
} }
sgl.setup(&sgl_desc) 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) { fn cleanup(user_data voidptr) {
@ -93,6 +102,7 @@ fn frame(user_data voidptr) {
app.ps.update(dt) app.ps.update(dt)
draw(app) draw(app)
gfx.begin_default_pass(&app.pass_action, app.width, app.height) gfx.begin_default_pass(&app.pass_action, app.width, app.height)
sgl.default_pipeline()
sgl.draw() sgl.draw()
gfx.end_pass() gfx.end_pass()
gfx.commit() gfx.commit()