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-rw-r--r--themes/Snowflake.cpp49
-rw-r--r--themes/Snowflake.h1
-rwxr-xr-xthemes/dist/output.wasmbin82965 -> 83691 bytes
3 files changed, 39 insertions, 11 deletions
diff --git a/themes/Snowflake.cpp b/themes/Snowflake.cpp
index da42515..5890b57 100644
--- a/themes/Snowflake.cpp
+++ b/themes/Snowflake.cpp
@@ -41,6 +41,7 @@ inline void initFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData*
inline void spawnFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData* ud) {
ud->velocity = Vector2(randomFloatBetween(-10, 10), randomFloatBetween(-100, -85));
ud->position = Vector2(randomFloatBetween(0, renderer->xMax), randomFloatBetween(renderer->yMax, renderer->yMax + 256));
+ ud->isAlive = true;
}
inline void findAndSpawnNextFlake(SnowflakeParticleRenderer* renderer) {
@@ -49,7 +50,7 @@ inline void findAndSpawnNextFlake(SnowflakeParticleRenderer* renderer) {
if (renderer->endIndex >= renderer->numSnowflakes)
renderer->endIndex = 0;
- } while (renderer->updateData[renderer->endIndex].onGround);
+ } while (renderer->updateData[renderer->endIndex].isAlive);
spawnFlake(renderer, &renderer->updateData[renderer->endIndex]);
}
@@ -106,6 +107,26 @@ void SnowflakeParticleRenderer::load(SnowflakeLoadParameters params, Renderer2d*
glBindVertexArray(0);
}
+inline void updateFlake(SnowflakeParticleRenderer* renderer, SnowflakeUpdateData* ud, int32 s, float32 dtSeconds, bool addWind) {
+ // Once the snowflake has been set to die in this interval, we try and increment the
+ // startIndex
+ if (!ud->isAlive && renderer->startIndex == s) {
+ renderer->startIndex = (renderer->startIndex + 1) % renderer->numSnowflakes;
+ return;
+ }
+
+ if (addWind) ud->velocity += renderer->windSpeed;
+ ud->position += ud->velocity * dtSeconds;
+
+ if (ud->position.y < 0)
+ ud->isAlive = false;
+
+ Mat4x4 m = Mat4x4().translateByVec2(ud->position);
+ for (int32 v = ud->vtxIdx; v < (ud->vtxIdx + ud->numVertices); v++) {
+ renderer->vertices.data[v].vMatrix = m;
+ }
+}
+
void SnowflakeParticleRenderer::update(float32 dtSeconds) {
timeUntilNextSpawnSeconds -= dtSeconds;
if (timeUntilNextSpawnSeconds < 0) {
@@ -121,16 +142,22 @@ void SnowflakeParticleRenderer::update(float32 dtSeconds) {
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);
- for (int32 v = ud->vtxIdx; v < (ud->vtxIdx + ud->numVertices); v++) {
- vertices.data[v].vMatrix = m;
+ if (startIndex < endIndex) {
+ for (int32 s = startIndex; s < endIndex; s++) {
+ SnowflakeUpdateData* ud = &updateData[s];
+ updateFlake(this, ud, s, dtSeconds, addWind);
+ }
+ }
+ else {
+ int32 endRange = startIndex - numSnowflakes;
+ for (int32 s = endIndex - 1; s >= endRange; s--) {
+ SnowflakeUpdateData* ud;
+ if (s < 0)
+ ud = &updateData[numSnowflakes + s];
+ else
+ ud = &updateData[s];
+
+ updateFlake(this, ud, s, dtSeconds, addWind);
}
}
}
diff --git a/themes/Snowflake.h b/themes/Snowflake.h
index d44851b..f67c214 100644
--- a/themes/Snowflake.h
+++ b/themes/Snowflake.h
@@ -22,6 +22,7 @@ struct SnowflakeUpdateData {
Vector2 velocity;
Vector2 position;
float32 rotation;
+ bool isAlive = false;
bool onGround = false;
int32 vtxIdx = 0;
diff --git a/themes/dist/output.wasm b/themes/dist/output.wasm
index 776adba..d78d57a 100755
--- a/themes/dist/output.wasm
+++ b/themes/dist/output.wasm
Binary files differ