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refactor: extract color write mask, name frustum epsilon, add comments

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- vk_pipeline: extract kColorWriteAll constant from 4 duplicated RGBA
  bitmask expressions across blend mode functions, with why-comment
- frustum: name kMinNormalLenSq epsilon (1e-8) with why-comment —
  prevents division by zero on degenerate planes
- dbc_loader: add why-comment on DBC field width validation — all
  fields are fixed 4-byte uint32 per format spec
- pin_auth: replace 0x30 hex literal with '0' char constant, add
  why-comment on ASCII encoding for server HMAC compatibility
This commit is contained in:
Kelsi 2026-03-30 15:02:47 -07:00
parent ef787624fe
commit 548828f2ee
4 changed files with 19 additions and 11 deletions
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5
src/rendering/frustum.cpp
View file

@ -64,7 +64,10 @@ void Frustum::extractFromMatrix(const glm::mat4& vp) {
void Frustum::normalizePlane(Plane& plane) {
float lenSq = glm::dot(plane.normal, plane.normal);
if (lenSq > 0.00000001f) {
// Skip normalization for degenerate planes (near-zero normal) to avoid
// division by zero or amplifying floating-point noise into huge normals.
constexpr float kMinNormalLenSq = 1e-8f;
if (lenSq > kMinNormalLenSq) {
float invLen = glm::inversesqrt(lenSq);
plane.normal *= invLen;
plane.distance *= invLen;

18
src/rendering/vk_pipeline.cpp
View file

@ -202,18 +202,22 @@ VkPipeline PipelineBuilder::build(VkDevice device, VkPipelineCache cache) const
return pipeline;
}
// All RGBA channels enabled — used by every blend mode since we never need to
// mask individual channels (WoW's fixed-function pipeline always writes all four).
static constexpr VkColorComponentFlags kColorWriteAll =
VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |
VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
VkPipelineColorBlendAttachmentState PipelineBuilder::blendDisabled() {
VkPipelineColorBlendAttachmentState state{};
state.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |
VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
state.colorWriteMask = kColorWriteAll;
state.blendEnable = VK_FALSE;
return state;
}
VkPipelineColorBlendAttachmentState PipelineBuilder::blendAlpha() {
VkPipelineColorBlendAttachmentState state{};
state.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |
VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
state.colorWriteMask = kColorWriteAll;
state.blendEnable = VK_TRUE;
state.srcColorBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
state.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
@ -226,8 +230,7 @@ VkPipelineColorBlendAttachmentState PipelineBuilder::blendAlpha() {
VkPipelineColorBlendAttachmentState PipelineBuilder::blendPremultiplied() {
VkPipelineColorBlendAttachmentState state{};
state.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |
VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
state.colorWriteMask = kColorWriteAll;
state.blendEnable = VK_TRUE;
state.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
state.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
@ -240,8 +243,7 @@ VkPipelineColorBlendAttachmentState PipelineBuilder::blendPremultiplied() {
VkPipelineColorBlendAttachmentState PipelineBuilder::blendAdditive() {
VkPipelineColorBlendAttachmentState state{};
state.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |
VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
state.colorWriteMask = kColorWriteAll;
state.blendEnable = VK_TRUE;
state.srcColorBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
state.dstColorBlendFactor = VK_BLEND_FACTOR_ONE;