diff options
Diffstat (limited to 'themes/src/Snowflake.cpp')
| -rw-r--r-- | themes/src/Snowflake.cpp | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/themes/src/Snowflake.cpp b/themes/src/Snowflake.cpp index 1eb6b74..452a716 100644 --- a/themes/src/Snowflake.cpp +++ b/themes/src/Snowflake.cpp @@ -4,6 +4,16 @@ #include "list.h" #include <cstdio> +/* + + What else to do? + + - Windstream that blows a certain selection of snowflakes in a loop-dee-loop pattern + - Snowflakes that land on the ground and melt + - Snowflakes that spin along the Y-axis for a three dimensional effect + + */ + const Vector4 snowColor = Vector4(1.0, 0.98, 0.98, 1); const Vector2 NUM_ARMS_RANGE = Vector2(6.f, 8.f); const Vector2 RADIUS_RANGE = Vector2(8.f, 32.f); @@ -65,10 +75,11 @@ inline void generateSnowflakeShape(matte::List<Vertex2D>* vertices, i32 numArms, } inline void initFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData* ud) { + ud->radius = randomFloatBetween(RADIUS_RANGE.x, RADIUS_RANGE.y); ud->vtxIdx = renderer->vertices.numElements; generateSnowflakeShape(&renderer->vertices, randomFloatBetween(NUM_ARMS_RANGE.x, NUM_ARMS_RANGE.y), - randomFloatBetween(RADIUS_RANGE.x, RADIUS_RANGE.y)); + ud->radius); ud->numVertices = renderer->vertices.numElements - ud->vtxIdx; ud->velocity = Vector2(randomFloatBetween(VELOCITY_RANGE_X.x, VELOCITY_RANGE_X.y), randomFloatBetween(VELOCITY_RANGE_Y.x, VELOCITY_RANGE_Y.y)); @@ -126,9 +137,10 @@ void SnowflakeParticleRenderer::load(SnowflakeLoadParameters params, Renderer2d* inline void resetFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData* ud) { ud->position.y = 2 * renderer->yMax; ud->velocity = Vector2(randomFloatBetween(-10, 10), randomFloatBetween(-100, -85)); + ud->rotation = 0; } -inline void updateFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData* ud, i32 s, f32 dtSeconds, bool addWind) { +inline void updateFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData* ud, i32 s, f32 dtSeconds) { ud->velocity = ud->velocity + Vector2(0, -(GRAVITY * dtSeconds)); if (addWind) ud->velocity += renderer->windSpeed; ud->position += ud->velocity * dtSeconds; @@ -139,24 +151,20 @@ inline void updateFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData renderer->vertices.data[v].vMatrix = m; } - if (ud->position.y <= -256) { + if (ud->position.y <= -ud->radius) { resetFlake(renderer, ud); } } void SnowflakeParticleRenderer::update(f32 dtSeconds) { - bool addWind = false; timeUntilNextWindSeconds -= dtSeconds; if (timeUntilNextWindSeconds < 0) { - timeUntilNextWindSeconds = windIntervalSeconds; - windSpeed = Vector2(randomFloatBetween(WIND_VELOCITY_RANGE_X.x, WIND_VELOCITY_RANGE_X.y), - randomFloatBetween(WIND_VELOCITY_RANGE_Y.x, WIND_VELOCITY_RANGE_Y.y)); - addWind = true; + timeUntilNextWindSeconds = randomFloatBetween(2.5f, 10.f); } for (i32 s = 0; s < numSnowflakes; s++) { SnowflakeUpdateData* ud = &updateData[s]; - updateFlake(this, ud, s, dtSeconds, addWind); + updateFlake(this, ud, s, dtSeconds); } } |