void RenderableParticleEffectEntityItem::updateQuads(RenderArgs* args, bool textured) {
float particleRadius = getParticleRadius();
glm::vec4 particleColor(toGlm(getXColor()), getLocalRenderAlpha());
glm::vec3 upOffset = args->_viewFrustum->getUp() * particleRadius;
glm::vec3 rightOffset = args->_viewFrustum->getRight() * particleRadius;
QVector<glm::vec3> vertices;
QVector<glm::vec3> positions;
QVector<glm::vec2> textureCoords;
vertices.reserve(getLivingParticleCount() * VERTS_PER_PARTICLE);
if (textured) {
textureCoords.reserve(getLivingParticleCount() * VERTS_PER_PARTICLE);
}
positions.reserve(getLivingParticleCount());
for (quint32 i = _particleHeadIndex; i != _particleTailIndex; i = (i + 1) % _maxParticles) {
positions.append(_particlePositions[i]);
if (textured) {
textureCoords.append(glm::vec2(0, 1));
textureCoords.append(glm::vec2(1, 1));
textureCoords.append(glm::vec2(1, 0));
textureCoords.append(glm::vec2(0, 0));
}
}
// sort particles back to front
::zSortAxis = args->_viewFrustum->getDirection();
qSort(positions.begin(), positions.end(), zSort);
for (int i = 0; i < positions.size(); i++) {
glm::vec3 pos = (textured) ? positions[i] : _particlePositions[i];
// generate corners of quad aligned to face the camera.
vertices.append(pos + rightOffset + upOffset);
vertices.append(pos - rightOffset + upOffset);
vertices.append(pos - rightOffset - upOffset);
vertices.append(pos + rightOffset - upOffset);
}
if (textured) {
DependencyManager::get<GeometryCache>()->updateVertices(_cacheID, vertices, textureCoords, particleColor);
} else {
DependencyManager::get<GeometryCache>()->updateVertices(_cacheID, vertices, particleColor);
}
}
bool ParticleEffectEntityItem::isAnimatingSomething() const {
// keep animating if there are particles still alive.
return (getAnimationIsPlaying() || getLivingParticleCount() > 0) && getAnimationFPS() != 0.0f;
}
void RenderableParticleEffectEntityItem::updateRenderItem() {
if (!_scene) {
return;
}
// make a copy of each particle's details
std::vector<ParticleDetails> particleDetails;
particleDetails.reserve(getLivingParticleCount());
for (quint32 i = _particleHeadIndex; i != _particleTailIndex; i = (i + 1) % _maxParticles) {
auto xcolor = _particleColors[i];
auto alpha = (uint8_t)(glm::clamp(_particleAlphas[i] * getLocalRenderAlpha(), 0.0f, 1.0f) * 255.0f);
auto rgba = toRGBA(xcolor.red, xcolor.green, xcolor.blue, alpha);
particleDetails.push_back(ParticleDetails(_particlePositions[i], _particleRadiuses[i], rgba));
}
// sort particles back to front
// NOTE: this is view frustum might be one frame out of date.
auto frustum = AbstractViewStateInterface::instance()->getCurrentViewFrustum();
::zSortAxis = frustum->getDirection();
qSort(particleDetails.begin(), particleDetails.end(), zSort);
// allocate vertices
_vertices.clear();
// build vertices from particle positions and radiuses
glm::vec3 frustumPosition = frustum->getPosition();
for (auto&& particle : particleDetails) {
glm::vec3 particleDirection = particle.position - frustumPosition;
glm::vec3 right = glm::normalize(glm::cross(glm::vec3(0.0f, 1.0f, 0.0f), particleDirection));
glm::vec3 up = glm::normalize(glm::cross(right, particleDirection));
glm::vec3 upOffset = up * particle.radius;
glm::vec3 rightOffset = right * particle.radius;
// generate corners of quad aligned to face the camera.
_vertices.emplace_back(particle.position + rightOffset + upOffset, glm::vec2(1.0f, 1.0f), particle.rgba);
_vertices.emplace_back(particle.position - rightOffset + upOffset, glm::vec2(0.0f, 1.0f), particle.rgba);
_vertices.emplace_back(particle.position - rightOffset - upOffset, glm::vec2(0.0f, 0.0f), particle.rgba);
_vertices.emplace_back(particle.position + rightOffset - upOffset, glm::vec2(1.0f, 0.0f), particle.rgba);
}
render::PendingChanges pendingChanges;
pendingChanges.updateItem<ParticlePayload>(_renderItemId, [this](ParticlePayload& payload) {
// update vertex buffer
auto vertexBuffer = payload.getVertexBuffer();
size_t numBytes = sizeof(Vertex) * _vertices.size();
if (numBytes == 0) {
vertexBuffer->resize(0);
auto indexBuffer = payload.getIndexBuffer();
indexBuffer->resize(0);
return;
}
vertexBuffer->resize(numBytes);
gpu::Byte* data = vertexBuffer->editData();
memcpy(data, &(_vertices[0]), numBytes);
// FIXME, don't update index buffer if num particles has not changed.
// update index buffer
auto indexBuffer = payload.getIndexBuffer();
const size_t NUM_VERTS_PER_PARTICLE = 4;
const size_t NUM_INDICES_PER_PARTICLE = 6;
auto numQuads = (_vertices.size() / NUM_VERTS_PER_PARTICLE);
numBytes = sizeof(uint16_t) * numQuads * NUM_INDICES_PER_PARTICLE;
indexBuffer->resize(numBytes);
data = indexBuffer->editData();
auto indexPtr = reinterpret_cast<uint16_t*>(data);
for (size_t i = 0; i < numQuads; ++i) {
indexPtr[i * NUM_INDICES_PER_PARTICLE + 0] = i * NUM_VERTS_PER_PARTICLE + 0;
indexPtr[i * NUM_INDICES_PER_PARTICLE + 1] = i * NUM_VERTS_PER_PARTICLE + 1;
indexPtr[i * NUM_INDICES_PER_PARTICLE + 2] = i * NUM_VERTS_PER_PARTICLE + 3;
indexPtr[i * NUM_INDICES_PER_PARTICLE + 3] = i * NUM_VERTS_PER_PARTICLE + 1;
indexPtr[i * NUM_INDICES_PER_PARTICLE + 4] = i * NUM_VERTS_PER_PARTICLE + 2;
indexPtr[i * NUM_INDICES_PER_PARTICLE + 5] = i * NUM_VERTS_PER_PARTICLE + 3;
}
// update transform
glm::quat rot = _transform.getRotation();
glm::vec3 pos = _transform.getTranslation();
Transform t;
t.setRotation(rot);
payload.setModelTransform(t);
// transform _particleMinBound and _particleMaxBound corners into world coords
glm::vec3 d = _particleMaxBound - _particleMinBound;
const size_t NUM_BOX_CORNERS = 8;
glm::vec3 corners[NUM_BOX_CORNERS] = {
pos + rot * (_particleMinBound + glm::vec3(0.0f, 0.0f, 0.0f)),
pos + rot * (_particleMinBound + glm::vec3(d.x, 0.0f, 0.0f)),
pos + rot * (_particleMinBound + glm::vec3(0.0f, d.y, 0.0f)),
pos + rot * (_particleMinBound + glm::vec3(d.x, d.y, 0.0f)),
pos + rot * (_particleMinBound + glm::vec3(0.0f, 0.0f, d.z)),
pos + rot * (_particleMinBound + glm::vec3(d.x, 0.0f, d.z)),
pos + rot * (_particleMinBound + glm::vec3(0.0f, d.y, d.z)),
pos + rot * (_particleMinBound + glm::vec3(d.x, d.y, d.z))
};
glm::vec3 min(FLT_MAX, FLT_MAX, FLT_MAX);
glm::vec3 max = -min;
for (size_t i = 0; i < NUM_BOX_CORNERS; i++) {
min.x = std::min(min.x, corners[i].x);
min.y = std::min(min.y, corners[i].y);
min.z = std::min(min.z, corners[i].z);
max.x = std::max(max.x, corners[i].x);
max.y = std::max(max.y, corners[i].y);
max.z = std::max(max.z, corners[i].z);
}
AABox bound(min, max - min);
payload.setBound(bound);
bool textured = _texture && _texture->isLoaded();
if (textured) {
payload.setTexture(_texture->getGPUTexture());
payload.setPipeline(_texturedPipeline);
} else {
payload.setTexture(nullptr);
payload.setPipeline(_untexturedPipeline);
}
});
_scene->enqueuePendingChanges(pendingChanges);
}
bool ParticleEffectEntityItem::isEmittingParticles() const {
// keep emitting if there are particles still alive.
return (getIsEmitting() || getLivingParticleCount() > 0);
}
