port from perforce

2026-04-18 22:31:51 +02:00
commit 8d0ab5b7cc
8409 changed files with 3972376 additions and 0 deletions
--- a/evoke-64k/trunk/ev10/Water.cpp
+++ b/evoke-64k/trunk/ev10/Water.cpp
@@ -0,0 +1,84 @@
+#include "defines.h"
+
+#include "Water.h"
+
+#include "shader.h"
+#include "globals.h"
+
+#include "intrin.h"
+
+void Water::Init()
+{
+}
+
+void Water::Update(const D3DXMATRIX &mView, const D3DXMATRIX &mProj)
+{
+	// Mirror reflection
+	D3DXMATRIX mMirror;
+	D3DXMatrixIdentity(&mMirror);
+	mMirror._22 = -1.0f;
+	mMirror._42 = 2.0f * m_fWaterLevel;
+	m_ViewMatrix = mMirror * mView;
+
+	// Extract new view position
+	m_ViewPos.x = -(m_ViewMatrix._41 * m_ViewMatrix._11 + m_ViewMatrix._42 * m_ViewMatrix._12 + m_ViewMatrix._43 * m_ViewMatrix._13);
+	m_ViewPos.y = -(m_ViewMatrix._41 * m_ViewMatrix._21 + m_ViewMatrix._42 * m_ViewMatrix._22 + m_ViewMatrix._43 * m_ViewMatrix._23);
+	m_ViewPos.z = -(m_ViewMatrix._41 * m_ViewMatrix._31 + m_ViewMatrix._42 * m_ViewMatrix._32 + m_ViewMatrix._43 * m_ViewMatrix._33);
+
+	// Extract camera direction
+	m_ViewDir.x = m_ViewMatrix._13;
+	m_ViewDir.y = m_ViewMatrix._23;
+	m_ViewDir.z = m_ViewMatrix._33;
+
+	float fEyeHeight = -(mView._41 * mView._21 + mView._42 * mView._22 + mView._43 * mView._23);
+
+	float fReflectionClipHeight = m_fWaterLevel
+		- min(max(fEyeHeight - m_fWaterLevel, 0.0f), 64.0f) / 32.0f;
+
+	// Clip reflection
+	m_ProjMatrix = ObliqueProjectionMatrix(m_ViewMatrix, mProj,
+		D3DXPLANE(0.0f, -1.0f, 0.0f, fReflectionClipHeight));
+}
+
+/// Returns the sign of the given value
+inline float Sign0(float v)
+{
+	return (v > 0.0f) ? 1.0f : ((v < 0.0f) ? -1.0f : 0.0f);
+}
+
+// Computes a projection matrix that contains the given plane as near plane
+D3DXMATRIX Water::ObliqueProjectionMatrix(const D3DXMATRIX &mView, const D3DXMATRIX &mProjection, const D3DXPLANE &clipPlane)
+{
+	// Compute inverse transpose (orthogonal matrix)
+	D3DXMATRIX mViewInverseTranspose = mView;
+	mViewInverseTranspose._14 = -(mView._41 * mView._11 + mView._42 * mView._12 + mView._43 * mView._13);
+	mViewInverseTranspose._24 = -(mView._41 * mView._21 + mView._42 * mView._22 + mView._43 * mView._23);
+	mViewInverseTranspose._34 = -(mView._41 * mView._31 + mView._42 * mView._32 + mView._43 * mView._33);
+	mViewInverseTranspose._41 = mView._14;
+	mViewInverseTranspose._42 = mView._24;
+	mViewInverseTranspose._43 = mView._34;
+	
+	// Transform plane to view space
+	D3DXPLANE viewClipPlane = -clipPlane;
+	D3DXPlaneTransform(&viewClipPlane, &viewClipPlane, &mViewInverseTranspose);
+
+	// Check clip plane orientation
+	if(viewClipPlane.d > -0.001f)
+		return mProjection;
+
+	// Compute view-space corner point
+	D3DXVECTOR4 vFarCorner = D3DXVECTOR4(
+		Sign0(viewClipPlane.a + mProjection._31) / mProjection._11,
+		Sign0(viewClipPlane.b + mProjection._32) / mProjection._22,
+		-1.0f,
+		(1.0f + mProjection._33) / mProjection._43 );
+	
+	// Scale clip plane
+	D3DXPLANE projClipPlane = viewClipPlane * (1.0f / D3DXPlaneDot(&viewClipPlane, &vFarCorner));
+
+	// Modify projection matrix
+	return D3DXMATRIX(mProjection._11, mProjection._12, projClipPlane.a, mProjection._14,
+		mProjection._21, mProjection._22, projClipPlane.b, mProjection._24,
+		mProjection._31, mProjection._32, projClipPlane.c, mProjection._34,
+		mProjection._41, mProjection._42, projClipPlane.d, mProjection._44);
+}