diff options
Diffstat (limited to 'themes/Snowflake.cpp')
| -rw-r--r-- | themes/Snowflake.cpp | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/themes/Snowflake.cpp b/themes/Snowflake.cpp index 3c9afa4..da42515 100644 --- a/themes/Snowflake.cpp +++ b/themes/Snowflake.cpp @@ -5,7 +5,7 @@ const Vector4 snowColor = Vector4(1.0, 0.98, 0.98, 1); -inline void generateSnowflakeShape(List<Renderer2dVertex>* vertices, int32 numArms, float32 radius) { +inline void generateSnowflakeShape(List<Renderer2dVertex>* vertices, int32 numArms, float32 radius, float32 innerRadius) { float32 dx = ((2 * PI) / numArms) / 3.0; for (int32 centerIdx = 0; centerIdx < (3 * numArms); centerIdx+=3) { float32 degreeStart = dx * centerIdx; @@ -20,8 +20,8 @@ inline void generateSnowflakeShape(List<Renderer2dVertex>* vertices, int32 numAr Vector2 leftEnd = Vector2(radius * cosStart, radius * sinStart); Vector2 rightEnd = Vector2(radius * cosEnd, radius * sinEnd); Vector2 diff = (rightEnd - leftEnd) / 2.0; - Vector2 leftStart = Vector2(-diff.x, -diff.y); - Vector2 rightStart = diff; + Vector2 leftStart = Vector2(-diff.x, -diff.y) + Vector2(innerRadius * cosStart, innerRadius * sinStart); + Vector2 rightStart = diff + Vector2(innerRadius * cosEnd, innerRadius * sinEnd); vertices->add({ leftStart, snowColor, Mat4x4() }); vertices->add({ leftEnd, snowColor, Mat4x4() }); @@ -34,7 +34,7 @@ inline void generateSnowflakeShape(List<Renderer2dVertex>* vertices, int32 numAr inline void initFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData* ud) { ud->vtxIdx = renderer->vertices.numElements; - generateSnowflakeShape(&renderer->vertices, 6, randomFloatBetween(8.f, 24.f); + generateSnowflakeShape(&renderer->vertices, randomIntBetween(4, 16), randomFloatBetween(8.f, 16.f), randomFloatBetween(2.f, 6.f)); ud->numVertices = renderer->vertices.numElements - ud->vtxIdx; } @@ -113,8 +113,19 @@ void SnowflakeParticleRenderer::update(float32 dtSeconds) { findAndSpawnNextFlake(this); } + bool addWind = false; + timeUntilNextWindSeconds -= dtSeconds; + if (timeUntilNextWindSeconds < 0) { + timeUntilNextWindSeconds = windIntervalSeconds; + windSpeed = Vector2(randomFloatBetween(-10, 10), randomFloatBetween(-10, 0)); + addWind = true; + } + for (int32 s = startIndex; s < endIndex; s++) { SnowflakeUpdateData* ud = &updateData[s]; + + if (addWind) ud->velocity += windSpeed; + ud->position += ud->velocity * dtSeconds; Mat4x4 m = Mat4x4().translateByVec2(ud->position); |