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refactor: name random/camera constants, add alpha map static_assert

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- terrain_manager: extract kRand16Max (65535.0f) from 8 duplicated
  random normalization expressions — 16-bit mask to [0..1] float
- terrain_manager: add static_assert verifying packed alpha unpacks
  to full alpha map size (ALPHA_MAP_PACKED * 2 == ALPHA_MAP_SIZE)
- camera_controller: name kCameraClipEpsilon (0.1f) with why-comment
  preventing character model clipping at near-minimum distance
This commit is contained in:
Kelsi 2026-03-30 15:17:37 -07:00
parent a389fd2ef4
commit 55cac39541
2 changed files with 17 additions and 10 deletions
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7
src/rendering/camera_controller.cpp
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@ -191,8 +191,11 @@ void CameraController::update(float deltaTime) {
// Compute camera position
glm::vec3 actualCam;
if (actualDist < MIN_DISTANCE + 0.1f) {
actualCam = pivot + forward3D * 0.1f;
// Small offset prevents the camera from clipping into the character
// model when collision pushes it to near-minimum distance.
constexpr float kCameraClipEpsilon = 0.1f;
if (actualDist < MIN_DISTANCE + kCameraClipEpsilon) {
actualCam = pivot + forward3D * kCameraClipEpsilon;
} else {
actualCam = pivot + camDir * actualDist;
}

20
src/rendering/terrain_manager.cpp
View file

@ -45,9 +45,13 @@ namespace {
// Alpha map format constants
constexpr size_t ALPHA_MAP_SIZE = 4096; // 64×64 uncompressed alpha bytes
constexpr size_t ALPHA_MAP_PACKED = 2048; // 64×64 packed 4-bit alpha (half size)
static_assert(ALPHA_MAP_PACKED * 2 == ALPHA_MAP_SIZE, "packed alpha must unpack to full size");
constexpr uint8_t ALPHA_FILL_FLAG = 0x80; // RLE command: fill vs. copy
constexpr uint8_t ALPHA_COUNT_MASK = 0x7F; // RLE command: count bits
// Random float normalization: mask to 16-bit then divide by max value to get [0..1]
constexpr float kRand16Max = 65535.0f;
// Placement transform constants
constexpr float kDegToRad = 3.14159f / 180.0f;
constexpr float kInv1024 = 1.0f / 1024.0f;
@ -1897,8 +1901,8 @@ void TerrainManager::generateGroundClutterPlacements(std::shared_ptr<PendingTile
};
for (uint32_t a = 0; a < attempts; ++a) {
float fracX = (nextRand() & 0xFFFFu) / 65535.0f * 8.0f;
float fracY = (nextRand() & 0xFFFFu) / 65535.0f * 8.0f;
float fracX = (nextRand() & 0xFFFFu) / kRand16Max * 8.0f;
float fracY = (nextRand() & 0xFFFFu) / kRand16Max * 8.0f;
if (hasAlpha && !alphaScratch.empty()) {
int alphaX = glm::clamp(static_cast<int>((fracX / 8.0f) * 63.0f), 0, 63);
@ -1965,8 +1969,8 @@ void TerrainManager::generateGroundClutterPlacements(std::shared_ptr<PendingTile
p.uniqueId = 0;
// MCNK chunk.position is already in terrain/render world space.
// Do not convert via ADT placement mapping (that is for MDDF/MODF records).
p.rotation = glm::vec3(0.0f, 0.0f, (nextRand() & 0xFFFFu) / 65535.0f * (2.0f * pi));
p.scale = 0.80f + ((nextRand() & 0xFFFFu) / 65535.0f) * 0.35f;
p.rotation = glm::vec3(0.0f, 0.0f, (nextRand() & 0xFFFFu) / kRand16Max * (2.0f * pi));
p.scale = 0.80f + ((nextRand() & 0xFFFFu) / kRand16Max) * 0.35f;
// Snap directly to sampled terrain height.
p.position = glm::vec3(worldX, worldY, worldZ + 0.01f);
pending->m2Placements.push_back(p);
@ -2005,8 +2009,8 @@ void TerrainManager::generateGroundClutterPlacements(std::shared_ptr<PendingTile
return seed;
};
float fracX = (nextRand() & 0xFFFFu) / 65535.0f * 8.0f;
float fracY = (nextRand() & 0xFFFFu) / 65535.0f * 8.0f;
float fracX = (nextRand() & 0xFFFFu) / kRand16Max * 8.0f;
float fracY = (nextRand() & 0xFFFFu) / kRand16Max * 8.0f;
if (hasRoadLikeTextureAt(chunk, fracX, fracY)) {
roadRejected++;
continue;
@ -2033,8 +2037,8 @@ void TerrainManager::generateGroundClutterPlacements(std::shared_ptr<PendingTile
PendingTile::M2Placement p;
p.modelId = proxyModelId;
p.uniqueId = 0;
p.rotation = glm::vec3(0.0f, 0.0f, (nextRand() & 0xFFFFu) / 65535.0f * (2.0f * pi));
p.scale = 0.75f + ((nextRand() & 0xFFFFu) / 65535.0f) * 0.40f;
p.rotation = glm::vec3(0.0f, 0.0f, (nextRand() & 0xFFFFu) / kRand16Max * (2.0f * pi));
p.scale = 0.75f + ((nextRand() & 0xFFFFu) / kRand16Max) * 0.40f;
p.position = glm::vec3(worldX, worldY, worldZ + 0.01f);
pending->m2Placements.push_back(p);
fallbackAdded++;