From 2036b60992bcd28d585d237fd0f57243f7675e5f Mon Sep 17 00:00:00 2001 From: skal Date: Fri, 6 Feb 2026 17:27:57 +0100 Subject: feat(particles): Implement transparent circular particles with alpha blending (Task #53) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ## Visual Improvements - Particles now render as smooth fading circles instead of squares - Added UV coordinates to vertex shader output - Fragment shader applies circular falloff (smoothstep 1.0 to 0.5) - Lifetime-based fade: alpha multiplied by particle.pos.w (1.0 → 0.0) ## Pipeline Changes - Enabled alpha blending for particle shaders (auto-detected via strstr) - Blend mode: SrcAlpha + OneMinusSrcAlpha (standard alpha blending) - Alpha channel: One + OneMinusSrcAlpha for proper compositing ## Demo Integration - Added 5 ParticleSprayEffect instances at key moments (6b, 12b, 17b, 24b, 56b) - Increased particle presence throughout demo - Particles now more visually impactful with transparency ## Files Modified - assets/final/shaders/particle_render.wgsl: Circular fade logic - src/gpu/gpu.cc: Auto-enable blending for particle shaders - assets/demo.seq: Added ParticleSprayEffect at multiple sequences ## Testing - All 23 tests pass (100%) - Verified with demo64k visual inspection --- src/generated/timeline.cc | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) (limited to 'src/generated/timeline.cc') diff --git a/src/generated/timeline.cc b/src/generated/timeline.cc index 0b69b09..cd03b77 100644 --- a/src/generated/timeline.cc +++ b/src/generated/timeline.cc @@ -48,9 +48,10 @@ void LoadTimeline(MainSequence& main_seq, WGPUDevice device, WGPUQueue queue, WG seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 0); seq->add_effect(std::make_shared(device, queue, format), 0.2f, 2.0f, 0); seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 1); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 8.000000f, 2); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 8.000000f, 3); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 4); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 2); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 8.000000f, 3); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 8.000000f, 4); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 5); main_seq.add_sequence(seq, 28.000000f, 0); } { @@ -61,25 +62,28 @@ void LoadTimeline(MainSequence& main_seq, WGPUDevice device, WGPUQueue queue, WG } { auto seq = std::make_shared(); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 0); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 0); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 0); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 1); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 1); main_seq.add_sequence(seq, 3.000000f, 1); } { auto seq = std::make_shared(); seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 0); seq->add_effect(std::make_shared(device, queue, format), 0.2f, 2.0f, 1); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 10.000000f, 2); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 3); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 5.000000f, 4); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 5.000000f, 5); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 2); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 10.000000f, 3); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 4); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 5.000000f, 5); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 5.000000f, 6); main_seq.add_sequence(seq, 12.000000f, 1); } { auto seq = std::make_shared(); seq->add_effect(std::make_shared(device, queue, format), .2f, 1.500000f, -1); seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 0); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 1); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 1); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 2); main_seq.add_sequence(seq, 6.000000f, 2); } { @@ -92,10 +96,11 @@ void LoadTimeline(MainSequence& main_seq, WGPUDevice device, WGPUQueue queue, WG auto seq = std::make_shared(); seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 0); seq->add_effect(std::make_shared(device, queue, format), 0.2f, 2.0f, 1); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 1); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 2); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 3); - seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 3.000000f, 4); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 2); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 2); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 2.000000f, 3); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 4.000000f, 4); + seq->add_effect(std::make_shared(device, queue, format), 0.000000f, 3.000000f, 5); main_seq.add_sequence(seq, 8.500000f, 2); } { -- cgit v1.2.3