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Decompile 2 functions in Source/Render/DX7/RendererFogDX7.cpp

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Batch #16431 by eAthena: 0 byte-identical, 2 confirmed by peer review.

- fn_02040 SquareRoot: logic confirmed by peer review
- fn_01863 PerspectiveMatrixDX7: logic confirmed by peer review

Peer-reviewed-by: Yommy, kyoshi
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
This commit is contained in:
ragnarok-clanker 2026-11-10 19:37:13 +00:00
commit 2fbd5dd9ab
1 changed files with 11 additions and 12 deletions
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23
Source/Render/DX7/RendererFogDX7.cpp
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@ -11,21 +11,24 @@
namespace {
// OFFSET: 0x00556E50
// FUNCTION: fn_02039
__declspec(noinline) float Sine(float angle) {
return sinf(angle);
__declspec(noinline) float Sine(volatile float angle) {
angle = sinf(angle);
return angle;
}
// OFFSET: 0x00556E40
// FUNCTION: fn_02038
__declspec(noinline) float Cosine(float angle) {
return cosf(angle);
__declspec(noinline) float Cosine(volatile float angle) {
angle = cosf(angle);
return angle;
}
}
// OFFSET: 0x00556E60
// FUNCTION: fn_02040
float SquareRoot(float value) {
return sqrtf(value);
float SquareRoot(volatile float value) {
value = sqrtf(value);
return value;
}
// OFFSET: 0x00548C30
@ -44,12 +47,8 @@ HRESULT PerspectiveMatrixDX7(D3DMATRIX& matrix, float fov, float aspect, float n
return E_INVALIDARG;
}
const float cosineX = Cosine(half);
const float sineX = Sine(half);
const float scaleX = static_cast<float>((static_cast<double>(cosineX) / sineX) * aspect);
const float cosineY = Cosine(half);
const float sineY = Sine(half);
const float scaleY = static_cast<float>(static_cast<double>(cosineY) / sineY);
const float scaleX = Cosine(half) / Sine(half) * aspect;
const float scaleY = Cosine(half) / Sine(half);
const float depth = farPlane / difference;
matrix._12 = matrix._13 = matrix._14 = 0;