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Add distance culling to shadow passes for CPU-bound shadow perf

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All three shadow renderers (WMO, M2, Character) were iterating every
loaded instance with zero culling. Now skip instances outside the
180-unit shadow frustum radius via squared-distance check.
This commit is contained in:
Kelsi 2026-02-23 04:48:26 -08:00
parent 2cfa9d6b19
commit 2124761ea8
3 changed files with 20 additions and 3 deletions
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8
src/rendering/m2_renderer.cpp
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@ -2607,11 +2607,13 @@ bool M2Renderer::initializeShadow(VkRenderPass shadowRenderPass) {
return true;
}
void M2Renderer::renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix, float globalTime) {
void M2Renderer::renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix, float globalTime,
const glm::vec3& shadowCenter, float shadowRadius) {
if (!shadowPipeline_ || !shadowParamsSet_) return;
if (instances.empty() || models.empty()) return;
struct ShadowPush { glm::mat4 lightSpaceMatrix; glm::mat4 model; };
const float shadowRadiusSq = shadowRadius * shadowRadius;
// Helper lambda to draw instances with a given foliageSway setting
auto drawPass = [&](bool foliagePass) {
@ -2641,6 +2643,10 @@ void M2Renderer::renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMa
const M2ModelGPU* currentModel = nullptr;
for (const auto& instance : instances) {
// Distance cull against shadow frustum
glm::vec3 diff = instance.position - shadowCenter;
if (glm::dot(diff, diff) > shadowRadiusSq) continue;
auto modelIt = models.find(instance.modelId);
if (modelIt == models.end()) continue;
const M2ModelGPU& model = modelIt->second;