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Add GPU occlusion query culling for WMO groups

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Renders bounding boxes in depth-only pre-pass and queries GPU for
visibility. Groups fully occluded in previous frame are skipped.
Significantly improves performance in dense areas like Stormwind.
This commit is contained in:
Kelsi 2026-02-05 15:51:08 -08:00
parent 33f4072846
commit b758f45a9f
3 changed files with 241 additions and 12 deletions
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59
include/rendering/wmo_renderer.hpp
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@ -136,11 +136,38 @@ public:
void setPortalCulling(bool enabled) { portalCulling = enabled; }
bool isPortalCullingEnabled() const { return portalCulling; }
/**
* Enable/disable distance-based group culling
*/
void setDistanceCulling(bool enabled, float maxDistance = 500.0f) {
distanceCulling = enabled;
maxGroupDistance = maxDistance;
maxGroupDistanceSq = maxDistance * maxDistance;
}
bool isDistanceCullingEnabled() const { return distanceCulling; }
float getMaxGroupDistance() const { return maxGroupDistance; }
/**
* Get number of groups culled by portals last frame
*/
uint32_t getPortalCulledGroups() const { return lastPortalCulledGroups; }
/**
* Get number of groups culled by distance last frame
*/
uint32_t getDistanceCulledGroups() const { return lastDistanceCulledGroups; }
/**
* Enable/disable GPU occlusion query culling
*/
void setOcclusionCulling(bool enabled) { occlusionCulling = enabled; }
bool isOcclusionCullingEnabled() const { return occlusionCulling; }
/**
* Get number of groups culled by occlusion queries last frame
*/
uint32_t getOcclusionCulledGroups() const { return lastOcclusionCulledGroups; }
void setFog(const glm::vec3& color, float start, float end) {
fogColor = color; fogStart = start; fogEnd = end;
}
@ -340,6 +367,22 @@ private:
*/
GLuint loadTexture(const std::string& path);
/**
* Initialize occlusion query resources (bbox VAO, shader)
*/
void initOcclusionResources();
/**
* Run occlusion query pre-pass for an instance
*/
void runOcclusionQueries(const WMOInstance& instance, const ModelData& model,
const glm::mat4& view, const glm::mat4& projection);
/**
* Check if a group passed occlusion test (uses previous frame results)
*/
bool isGroupOccluded(uint32_t instanceId, uint32_t groupIndex) const;
struct GridCell {
int x;
int y;
@ -384,8 +427,24 @@ private:
bool wireframeMode = false;
bool frustumCulling = true;
bool portalCulling = false; // Disabled by default - needs debugging
bool distanceCulling = false; // Disabled - causes ground to disappear
bool occlusionCulling = true; // GPU occlusion queries
float maxGroupDistance = 500.0f;
float maxGroupDistanceSq = 250000.0f; // maxGroupDistance^2
uint32_t lastDrawCalls = 0;
mutable uint32_t lastPortalCulledGroups = 0;
mutable uint32_t lastDistanceCulledGroups = 0;
mutable uint32_t lastOcclusionCulledGroups = 0;
// Occlusion query resources
GLuint bboxVao = 0;
GLuint bboxVbo = 0;
std::unique_ptr<Shader> occlusionShader;
// Query objects per (instance, group) - reused each frame
// Key: (instanceId << 16) | groupIndex
mutable std::unordered_map<uint32_t, GLuint> occlusionQueries;
// Results from previous frame (1 frame latency to avoid GPU stalls)
mutable std::unordered_map<uint32_t, bool> occlusionResults;
// Fog parameters
glm::vec3 fogColor = glm::vec3(0.5f, 0.6f, 0.7f);