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Use a 4x4 matrix to transform coordinates

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This commit is contained in:
Chris Robinson 2009-11-23 04:13:51 -08:00
parent 2d1b378ef2
commit cfb30fe975
1 changed files with 30 additions and 23 deletions
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53
Alc/ALu.c
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@ -110,14 +110,15 @@ static __inline ALvoid aluNormalize(ALfloat *inVector)
}
}
static __inline ALvoid aluMatrixVector(ALfloat *vector,ALfloat matrix[3][3])
static __inline ALvoid aluMatrixVector(ALfloat *vector,ALfloat w,ALfloat matrix[4][4])
{
ALfloat result[3];
ALfloat temp[4] = {
vector[0], vector[1], vector[2], w
};
result[0] = vector[0]*matrix[0][0] + vector[1]*matrix[1][0] + vector[2]*matrix[2][0];
result[1] = vector[0]*matrix[0][1] + vector[1]*matrix[1][1] + vector[2]*matrix[2][1];
result[2] = vector[0]*matrix[0][2] + vector[1]*matrix[1][2] + vector[2]*matrix[2][2];
memcpy(vector, result, sizeof(result));
vector[0] = temp[0]*matrix[0][0] + temp[1]*matrix[1][0] + temp[2]*matrix[2][0] + temp[3]*matrix[3][0];
vector[1] = temp[0]*matrix[0][1] + temp[1]*matrix[1][1] + temp[2]*matrix[2][1] + temp[3]*matrix[3][1];
vector[2] = temp[0]*matrix[0][2] + temp[1]*matrix[1][2] + temp[2]*matrix[2][2] + temp[3]*matrix[3][2];
}
static ALvoid SetSpeakerArrangement(const char *name, ALfloat SpeakerAngle[OUTPUTCHANNELS],
@ -408,7 +409,7 @@ static ALvoid CalcSourceParams(const ALCcontext *ALContext, ALsource *ALSource,
ALfloat MinVolume,MaxVolume,MinDist,MaxDist,Rolloff,OuterGainHF;
ALfloat ConeVolume,ConeHF,SourceVolume,ListenerGain;
ALfloat DopplerFactor, DopplerVelocity, flSpeedOfSound;
ALfloat Matrix[3][3];
ALfloat Matrix[4][4];
ALfloat flAttenuation;
ALfloat RoomAttenuation[MAX_SENDS];
ALfloat MetersPerUnit;
@ -503,29 +504,35 @@ static ALvoid CalcSourceParams(const ALCcontext *ALContext, ALsource *ALSource,
//1. Translate Listener to origin (convert to head relative)
if(ALSource->bHeadRelative==AL_FALSE)
{
ALfloat U[3],V[3],N[3];
ALfloat U[3],V[3],N[3],P[3];
// Build transform matrix
aluCrossproduct(ALContext->Listener.Forward, ALContext->Listener.Up, U); // Right-vector
aluNormalize(U); // Normalized Right-vector
memcpy(V, ALContext->Listener.Up, sizeof(V)); // Up-vector
aluNormalize(V); // Normalized Up-vector
memcpy(N, ALContext->Listener.Forward, sizeof(N)); // At-vector
aluNormalize(N); // Normalized At-vector
Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0];
Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1];
Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2];
memcpy(V, ALContext->Listener.Up, sizeof(V)); // Up-vector
aluNormalize(V); // Normalized Up-vector
aluCrossproduct(N, V, U); // Right-vector
aluNormalize(U); // Normalized Right-vector
P[0] = -(ALContext->Listener.Position[0]*U[0] + // Translation
ALContext->Listener.Position[1]*U[1] +
ALContext->Listener.Position[2]*U[2]);
P[1] = -(ALContext->Listener.Position[0]*V[0] +
ALContext->Listener.Position[1]*V[1] +
ALContext->Listener.Position[2]*V[2]);
P[2] = -(ALContext->Listener.Position[0]*-N[0] +
ALContext->Listener.Position[1]*-N[1] +
ALContext->Listener.Position[2]*-N[2]);
Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0]; Matrix[0][3] = 0.0f;
Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1]; Matrix[1][3] = 0.0f;
Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2]; Matrix[2][3] = 0.0f;
Matrix[3][0] = P[0]; Matrix[3][1] = P[1]; Matrix[3][2] = P[2]; Matrix[3][3] = 1.0f;
// Translate source position into listener space
Position[0] -= ALContext->Listener.Position[0];
Position[1] -= ALContext->Listener.Position[1];
Position[2] -= ALContext->Listener.Position[2];
// Transform source position and direction into listener space
aluMatrixVector(Position, Matrix);
aluMatrixVector(Direction, Matrix);
aluMatrixVector(Position, 1.0f, Matrix);
aluMatrixVector(Direction, 0.0f, Matrix);
// Transform source and listener velocity into listener space
aluMatrixVector(Velocity, Matrix);
aluMatrixVector(ListenerVel, Matrix);
aluMatrixVector(Velocity, 0.0f, Matrix);
aluMatrixVector(ListenerVel, 0.0f, Matrix);
}
else
ListenerVel[0] = ListenerVel[1] = ListenerVel[2] = 0.0f;