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Frustum culling

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John McCardle 2026-02-04 23:45:43 -05:00
commit f2ccdff499
2 changed files with 144 additions and 0 deletions
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34
src/3d/Viewport3D.cpp
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@ -515,10 +515,23 @@ void Viewport3D::renderEntities(const mat4& view, const mat4& proj) {
#ifdef MCRF_HAS_GL
if (!entities_ || !shader_ || !shader_->isValid()) return;
// Extract frustum for culling
mat4 viewProj = proj * view;
Frustum frustum;
frustum.extractFromMatrix(viewProj);
// Render non-skeletal entities first
shader_->bind();
for (auto& entity : *entities_) {
if (entity && entity->isVisible()) {
// Frustum culling - use entity position with generous bounding radius
vec3 pos = entity->getWorldPos();
float boundingRadius = entity->getScale().x * 2.0f; // Approximate bounding sphere
if (!frustum.containsSphere(pos, boundingRadius)) {
continue; // Skip this entity - outside view frustum
}
auto model = entity->getModel();
if (!model || !model->hasSkeleton()) {
entity->render(view, proj, shader_->getProgram());
@ -554,6 +567,14 @@ void Viewport3D::renderEntities(const mat4& view, const mat4& proj) {
for (auto& entity : *entities_) {
if (entity && entity->isVisible()) {
// Frustum culling for skeletal entities too
vec3 pos = entity->getWorldPos();
float boundingRadius = entity->getScale().x * 2.0f;
if (!frustum.containsSphere(pos, boundingRadius)) {
continue;
}
auto model = entity->getModel();
if (model && model->hasSkeleton()) {
entity->render(view, proj, skinnedShader_->getProgram());
@ -594,6 +615,11 @@ void Viewport3D::renderBillboards(const mat4& view, const mat4& proj) {
#ifdef MCRF_HAS_GL
if (!billboards_ || billboards_->empty() || !shader_ || !shader_->isValid()) return;
// Extract frustum for culling
mat4 viewProj = proj * view;
Frustum frustum;
frustum.extractFromMatrix(viewProj);
shader_->bind();
unsigned int shaderProgram = shader_->getProgram();
vec3 cameraPos = camera_.getPosition();
@ -607,6 +633,14 @@ void Viewport3D::renderBillboards(const mat4& view, const mat4& proj) {
for (auto& billboard : *billboards_) {
if (billboard && billboard->isVisible()) {
// Frustum culling for billboards
vec3 pos = billboard->getPosition();
float boundingRadius = billboard->getScale() * 2.0f; // Approximate
if (!frustum.containsSphere(pos, boundingRadius)) {
continue; // Skip - outside frustum
}
billboard->render(shaderProgram, view, proj, cameraPos);
}
}