bool UniformHandler::isVisibleSphere(const PVRTVec3& v3Centre, const VERTTYPE fRadius)
{
// get in view space
PVRTVec4 v4TransCentre = m_mWorldView * PVRTVec4(v3Centre,f2vt(1.0f));
// find clip space coord for centre
v4TransCentre = m_mProjection * v4TransCentre;
VERTTYPE fRadX,fRadY;
// scale radius according to perspective
if(m_bRotate)
{
fRadX = PVRTABS(VERTTYPEMUL(fRadius,m_mProjection(0,1)));
fRadY = PVRTABS(VERTTYPEMUL(fRadius,m_mProjection(1,0)));
}
else
{
fRadX = PVRTABS(VERTTYPEMUL(fRadius,m_mProjection(0,0)));
fRadY = PVRTABS(VERTTYPEMUL(fRadius,m_mProjection(1,1)));
}
VERTTYPE fRadZ = PVRTABS(VERTTYPEMUL(fRadius,m_mProjection(2,2)));
// check if inside frustums
// X
if(v4TransCentre.x+fRadX<-v4TransCentre.w)
{ // 'right' side out to 'left' def out
return false;
}
if(v4TransCentre.x-fRadX>v4TransCentre.w)
{ // 'left' side out to 'right' def out
return false;
}
// Y
if(v4TransCentre.y+fRadY<-v4TransCentre.w)
{ // 'up' side out to 'top' def out
return false;
}
if(v4TransCentre.y-fRadY>v4TransCentre.w)
{ // 'down' side out to 'bottom' def out
return false;
}
// Z
if(v4TransCentre.z+fRadZ<-v4TransCentre.w)
{ // 'far' side out to 'back' def out
return false;
}
if(v4TransCentre.z-fRadZ>v4TransCentre.w)
{ // 'near' side out to 'front' def out
return false;
}
return true;
}
/*!***************************************************************************
@Function PVRTMatrixQuaternionToAxisAngleX
@Input qIn Quaternion to transform
@Output vAxis Axis of rotation
@Output fAngle Angle of rotation
@Description Convert a quaternion to an axis and angle. Expects a unit
quaternion.
*****************************************************************************/
void PVRTMatrixQuaternionToAxisAngleX(
const PVRTQUATERNIONx &qIn,
PVRTVECTOR3x &vAxis,
int &fAngle)
{
int fCosAngle, fSinAngle;
int temp;
/* Compute some values */
fCosAngle = qIn.w;
temp = PVRTF2X(1.0f) - PVRTXMUL(fCosAngle, fCosAngle);
fAngle = PVRTXMUL(PVRTXACOS(fCosAngle), PVRTF2X(2.0f));
fSinAngle = PVRTF2X(((float)sqrt(PVRTX2F(temp))));
/* This is to avoid a division by zero */
if (PVRTABS(fSinAngle)<PVRTF2X(0.0005f))
{
fSinAngle = PVRTF2X(1.0f);
}
/* Get axis vector */
vAxis.x = PVRTXDIV(qIn.x, fSinAngle);
vAxis.y = PVRTXDIV(qIn.y, fSinAngle);
vAxis.z = PVRTXDIV(qIn.z, fSinAngle);
}
/*!***************************************************************************
@Function PVRTMatrixQuaternionNormalizeX
@Modified quat Vector to normalize
@Description Normalize quaternion.
Original quaternion is scaled down prior to be normalized in
order to avoid overflow issues.
*****************************************************************************/
void PVRTMatrixQuaternionNormalizeX(PVRTQUATERNIONx &quat)
{
PVRTQUATERNIONx qTemp;
int f, n;
/* Scale vector by uniform value */
n = PVRTABS(quat.w) + PVRTABS(quat.x) + PVRTABS(quat.y) + PVRTABS(quat.z);
qTemp.w = PVRTXDIV(quat.w, n);
qTemp.x = PVRTXDIV(quat.x, n);
qTemp.y = PVRTXDIV(quat.y, n);
qTemp.z = PVRTXDIV(quat.z, n);
/* Compute quaternion magnitude */
f = PVRTXMUL(qTemp.w, qTemp.w) + PVRTXMUL(qTemp.x, qTemp.x) + PVRTXMUL(qTemp.y, qTemp.y) + PVRTXMUL(qTemp.z, qTemp.z);
f = PVRTXDIV(PVRTF2X(1.0f), PVRTF2X(sqrt(PVRTX2F(f))));
/* Multiply vector components by f */
quat.x = PVRTXMUL(qTemp.x, f);
quat.y = PVRTXMUL(qTemp.y, f);
quat.z = PVRTXMUL(qTemp.z, f);
quat.w = PVRTXMUL(qTemp.w, f);
}
/*!***************************************************************************
@Function PVRTMatrixVec3NormalizeX
@Output vOut Normalized vector
@Input vIn Vector to normalize
@Description Normalizes the supplied vector.
The square root function is currently still performed
in floating-point.
Original vector is scaled down prior to be normalized in
order to avoid overflow issues.
****************************************************************************/
void PVRTMatrixVec3NormalizeX(
PVRTVECTOR3x &vOut,
const PVRTVECTOR3x &vIn)
{
int f, n;
PVRTVECTOR3x vTemp;
/* Scale vector by uniform value */
n = PVRTABS(vIn.x) + PVRTABS(vIn.y) + PVRTABS(vIn.z);
vTemp.x = PVRTXDIV(vIn.x, n);
vTemp.y = PVRTXDIV(vIn.y, n);
vTemp.z = PVRTXDIV(vIn.z, n);
/* Calculate x2+y2+z2/sqrt(x2+y2+z2) */
f = PVRTMatrixVec3DotProductX(vTemp, vTemp);
f = PVRTXDIV(PVRTF2X(1.0f), PVRTF2X(sqrt(PVRTX2F(f))));
/* Multiply vector components by f */
vOut.x = PVRTXMUL(vTemp.x, f);
vOut.y = PVRTXMUL(vTemp.y, f);
vOut.z = PVRTXMUL(vTemp.z, f);
}
/*!***************************************************************************
@Function PVRTMatrixInverseF
@Output mOut Inversed matrix
@Input mIn Original matrix
@Description Compute the inverse matrix of mIn.
The matrix must be of the form :
A 0
C 1
Where A is a 3x3 matrix and C is a 1x3 matrix.
*****************************************************************************/
void PVRTMatrixInverseF(
PVRTMATRIXf &mOut,
const PVRTMATRIXf &mIn)
{
PVRTMATRIXf mDummyMatrix;
double det_1;
double pos, neg, temp;
/* Calculate the determinant of submatrix A and determine if the
the matrix is singular as limited by the double precision
floating-point data representation. */
pos = neg = 0.0;
temp = mIn.f[ 0] * mIn.f[ 5] * mIn.f[10];
if (temp >= 0.0) pos += temp; else neg += temp;
temp = mIn.f[ 4] * mIn.f[ 9] * mIn.f[ 2];
if (temp >= 0.0) pos += temp; else neg += temp;
temp = mIn.f[ 8] * mIn.f[ 1] * mIn.f[ 6];
if (temp >= 0.0) pos += temp; else neg += temp;
temp = -mIn.f[ 8] * mIn.f[ 5] * mIn.f[ 2];
if (temp >= 0.0) pos += temp; else neg += temp;
temp = -mIn.f[ 4] * mIn.f[ 1] * mIn.f[10];
if (temp >= 0.0) pos += temp; else neg += temp;
temp = -mIn.f[ 0] * mIn.f[ 9] * mIn.f[ 6];
if (temp >= 0.0) pos += temp; else neg += temp;
det_1 = pos + neg;
/* Is the submatrix A singular? */
if ((det_1 == 0.0) || (PVRTABS(det_1 / (pos - neg)) < 1.0e-15))
{
/* Matrix M has no inverse */
_RPT0(_CRT_WARN, "Matrix has no inverse : singular matrix\n");
return;
}
else
{
/* Calculate inverse(A) = adj(A) / det(A) */
det_1 = 1.0 / det_1;
mDummyMatrix.f[ 0] = ( mIn.f[ 5] * mIn.f[10] - mIn.f[ 9] * mIn.f[ 6] ) * (float)det_1;
mDummyMatrix.f[ 1] = - ( mIn.f[ 1] * mIn.f[10] - mIn.f[ 9] * mIn.f[ 2] ) * (float)det_1;
mDummyMatrix.f[ 2] = ( mIn.f[ 1] * mIn.f[ 6] - mIn.f[ 5] * mIn.f[ 2] ) * (float)det_1;
mDummyMatrix.f[ 4] = - ( mIn.f[ 4] * mIn.f[10] - mIn.f[ 8] * mIn.f[ 6] ) * (float)det_1;
mDummyMatrix.f[ 5] = ( mIn.f[ 0] * mIn.f[10] - mIn.f[ 8] * mIn.f[ 2] ) * (float)det_1;
mDummyMatrix.f[ 6] = - ( mIn.f[ 0] * mIn.f[ 6] - mIn.f[ 4] * mIn.f[ 2] ) * (float)det_1;
mDummyMatrix.f[ 8] = ( mIn.f[ 4] * mIn.f[ 9] - mIn.f[ 8] * mIn.f[ 5] ) * (float)det_1;
mDummyMatrix.f[ 9] = - ( mIn.f[ 0] * mIn.f[ 9] - mIn.f[ 8] * mIn.f[ 1] ) * (float)det_1;
mDummyMatrix.f[10] = ( mIn.f[ 0] * mIn.f[ 5] - mIn.f[ 4] * mIn.f[ 1] ) * (float)det_1;
/* Calculate -C * inverse(A) */
mDummyMatrix.f[12] = - ( mIn.f[12] * mDummyMatrix.f[ 0] + mIn.f[13] * mDummyMatrix.f[ 4] + mIn.f[14] * mDummyMatrix.f[ 8] );
mDummyMatrix.f[13] = - ( mIn.f[12] * mDummyMatrix.f[ 1] + mIn.f[13] * mDummyMatrix.f[ 5] + mIn.f[14] * mDummyMatrix.f[ 9] );
mDummyMatrix.f[14] = - ( mIn.f[12] * mDummyMatrix.f[ 2] + mIn.f[13] * mDummyMatrix.f[ 6] + mIn.f[14] * mDummyMatrix.f[10] );
/* Fill in last row */
mDummyMatrix.f[ 3] = 0.0f;
mDummyMatrix.f[ 7] = 0.0f;
mDummyMatrix.f[11] = 0.0f;
mDummyMatrix.f[15] = 1.0f;
}
/* Copy contents of dummy matrix in pfMatrix */
mOut = mDummyMatrix;
}
/*!****************************************************************************
@Function RenderScene
@Return bool true if no error occured
@Description Main rendering loop function of the program. The shell will
call this function every frame.
eglSwapBuffers() will be performed by PVRShell automatically.
PVRShell will also manage important OS events.
Will also manage relevent OS events. The user has access to
these events through an abstraction layer provided by PVRShell.
******************************************************************************/
bool OGLES2ChameleonMan::RenderScene()
{
// Clear the color and depth buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Use shader program
glUseProgram(m_SkinnedShaderProgram.uiId);
if(PVRShellIsKeyPressed(PVRShellKeyNameACTION1))
{
m_bEnableDOT3 = !m_bEnableDOT3;
glUniform1i(m_SkinnedShaderProgram.auiLoc[ebUseDot3], m_bEnableDOT3);
}
/*
Calculates the frame number to animate in a time-based manner.
Uses the shell function PVRShellGetTime() to get the time in milliseconds.
*/
unsigned long iTime = PVRShellGetTime();
if(iTime > m_iTimePrev)
{
float fDelta = (float) (iTime - m_iTimePrev);
m_fFrame += fDelta * g_fDemoFrameRate;
// Increment the counters to make sure our animation works
m_fLightPos += fDelta * 0.0034f;
m_fWallPos += fDelta * 0.00027f;
m_fBackgroundPos += fDelta * -0.000027f;
// Wrap the Animation back to the Start
if(m_fLightPos >= PVRT_TWO_PI)
m_fLightPos -= PVRT_TWO_PI;
if(m_fWallPos >= PVRT_TWO_PI)
m_fWallPos -= PVRT_TWO_PI;
if(m_fBackgroundPos <= 0)
m_fBackgroundPos += 1.0f;
if(m_fFrame > m_Scene.nNumFrame - 1)
m_fFrame = 0;
}
m_iTimePrev = iTime;
// Set the scene animation to the current frame
m_Scene.SetFrame(m_fFrame);
// Set up camera
PVRTVec3 vFrom, vTo, vUp(0.0f, 1.0f, 0.0f);
PVRTMat4 mView, mProjection;
PVRTVec3 LightPos;
float fFOV;
int i;
bool bRotate = PVRShellGet(prefIsRotated) && PVRShellGet(prefFullScreen);
// Get the camera position, target and field of view (fov)
if(m_Scene.pCamera[0].nIdxTarget != -1) // Does the camera have a target?
fFOV = m_Scene.GetCameraPos( vFrom, vTo, 0); // vTo is taken from the target node
else
fFOV = m_Scene.GetCamera( vFrom, vTo, vUp, 0); // vTo is calculated from the rotation
fFOV *= bRotate ? (float)PVRShellGet(prefWidth)/(float)PVRShellGet(prefHeight) : (float)PVRShellGet(prefHeight)/(float)PVRShellGet(prefWidth);
/*
We can build the model view matrix from the camera position, target and an up vector.
For this we use PVRTMat4::LookAtRH().
*/
mView = PVRTMat4::LookAtRH(vFrom, vTo, vUp);
// Calculate the projection matrix
mProjection = PVRTMat4::PerspectiveFovRH(fFOV, (float)PVRShellGet(prefWidth)/(float)PVRShellGet(prefHeight), g_fCameraNear, g_fCameraFar, PVRTMat4::OGL, bRotate);
// Update Light Position and related VGP Program constant
LightPos.x = 200.0f;
LightPos.y = 350.0f;
LightPos.z = 200.0f * PVRTABS(sin((PVRT_PI / 4.0f) + m_fLightPos));
glUniform3fv(m_SkinnedShaderProgram.auiLoc[eLightPos], 1, LightPos.ptr());
// Set up the View * Projection Matrix
PVRTMat4 mViewProjection;
mViewProjection = mProjection * mView;
glUniformMatrix4fv(m_SkinnedShaderProgram.auiLoc[eViewProj], 1, GL_FALSE, mViewProjection.ptr());
// Enable the vertex attribute arrays
for(i = 0; i < eNumAttribs; ++i) glEnableVertexAttribArray(i);
// Draw skinned meshes
for(unsigned int i32NodeIndex = 0; i32NodeIndex < 3; ++i32NodeIndex)
{
// Bind correct texture
switch(i32NodeIndex)
{
case eBody:
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, m_ui32TexHeadNormalMap);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_ui32TexHeadBody);
break;
case eLegs:
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, m_ui32TexLegsNormalMap);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_ui32TexLegs);
break;
default:
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, m_ui32TexBeltNormalMap);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_ui32TexBelt);
break;
}
DrawSkinnedMesh(i32NodeIndex);
}
// Safely disable the vertex attribute arrays
for(i = 0; i < eNumAttribs; ++i) glDisableVertexAttribArray(i);
// Draw non-skinned meshes
glUseProgram(m_DefaultShaderProgram.uiId);
// Enable the vertex attribute arrays
for(i = 0; i < eNumDefaultAttribs; ++i) glEnableVertexAttribArray(i);
for(unsigned int i32NodeIndex = 3; i32NodeIndex < m_Scene.nNumMeshNode; ++i32NodeIndex)
{
SPODNode& Node = m_Scene.pNode[i32NodeIndex];
SPODMesh& Mesh = m_Scene.pMesh[Node.nIdx];
// bind the VBO for the mesh
glBindBuffer(GL_ARRAY_BUFFER, m_puiVbo[Node.nIdx]);
// bind the index buffer, won't hurt if the handle is 0
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_puiIndexVbo[Node.nIdx]);
// Get the node model matrix
PVRTMat4 mWorld;
mWorld = m_Scene.GetWorldMatrix(Node);
// Setup the appropriate texture and transformation (if needed)
switch(i32NodeIndex)
{
case eWall:
glBindTexture(GL_TEXTURE_2D, m_ui32TexWall);
// Rotate the wall mesh which is circular
mWorld *= PVRTMat4::RotationY(m_fWallPos);
glUniform1f(m_DefaultShaderProgram.auiLoc[eDefaultUOffset], 0);
break;
case eBackground:
glBindTexture(GL_TEXTURE_2D, m_ui32TexSkyLine);
glUniform1f(m_DefaultShaderProgram.auiLoc[eDefaultUOffset], m_fBackgroundPos);
break;
case eLights:
{
glBindTexture(GL_TEXTURE_2D, m_ui32TexLamp);
PVRTMat4 mWallWorld = m_Scene.GetWorldMatrix(m_Scene.pNode[eWall]);
mWorld = mWallWorld * PVRTMat4::RotationY(m_fWallPos) * mWallWorld.inverse() * mWorld;
glUniform1f(m_DefaultShaderProgram.auiLoc[eDefaultUOffset], 0);
}
break;
default:
break;
};
// Set up shader uniforms
PVRTMat4 mModelViewProj;
mModelViewProj = mViewProjection * mWorld;
glUniformMatrix4fv(m_DefaultShaderProgram.auiLoc[eDefaultMVPMatrix], 1, GL_FALSE, mModelViewProj.ptr());
// Set the vertex attribute offsets
glVertexAttribPointer(DEFAULT_VERTEX_ARRAY, 3, GL_FLOAT, GL_FALSE, Mesh.sVertex.nStride, Mesh.sVertex.pData);
glVertexAttribPointer(DEFAULT_TEXCOORD_ARRAY, 2, GL_FLOAT, GL_FALSE, Mesh.psUVW[0].nStride, Mesh.psUVW[0].pData);
// Indexed Triangle list
glDrawElements(GL_TRIANGLES, Mesh.nNumFaces*3, GL_UNSIGNED_SHORT, 0);
}
// Safely disable the vertex attribute arrays
for(i = 0; i < eNumAttribs; ++i) glDisableVertexAttribArray(i);
// unbind the VBOs
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
// Display the demo name using the tools. For a detailed explanation, see the training course IntroducingPVRTools
const char * pDescription;
if(m_bEnableDOT3)
pDescription = "Skinning with DOT3 Per Pixel Lighting";
else
pDescription = "Skinning with Vertex Lighting";
m_Print3D.DisplayDefaultTitle("Chameleon Man", pDescription, ePVRTPrint3DSDKLogo);
m_Print3D.Flush();
return true;
}
/*******************************************************************************
* Function Name : RenderScene
* Returns : true if no error occured
* Description : Main rendering loop function of the program. The shell will
* call this function every frame.
*******************************************************************************/
bool OGLESPolybump::RenderScene()
{
if(PVRShellIsKeyPressed(PVRShellKeyNameACTION1))
m_bDrawWithDot3 = !m_bDrawWithDot3;
PVRTVec4 LightVector;
PVRTMat4 mRotateY, mModelView;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
LightVector.x = PVRTSIN(m_i32Frame / 40.0f);
LightVector.y = 0.0f;
LightVector.z = -PVRTABS(PVRTCOS(m_i32Frame / 40.0f));
LightVector.w = 0.0f;
PVRTTransformBack(&LightVector, &LightVector, &m_mView);
// Normalize light vector in case it is not
LightVector.normalize();
if(m_bDrawWithDot3)
{
// Setup texture blend modes
// First layer (Dot3)
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_ui32CloneMap);
if(m_bCombinersPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_DOT3_RGB);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PREVIOUS);
}
else if(m_bIMGTextureFFExtPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DOT3_RGBA);
}
// Second layer (modulate)
glActiveTexture(GL_TEXTURE1);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, m_ui32DiffuseMap);
if(m_bCombinersPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PREVIOUS);
}
else if (m_bIMGTextureFFExtPresent)
{
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
// Calculate Dot3 light direction
CalculateDot3LightDirection(LightVector);
}
else
{
glActiveTexture(GL_TEXTURE0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, m_ui32DiffuseMap);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
LightVector.z = -LightVector.z;
glLightfv(GL_LIGHT0, GL_POSITION, &LightVector.x);
}
glMatrixMode(GL_MODELVIEW);
// Render mesh
SPODNode& Node = m_Scene.pNode[0];
// Rotate the mesh around a point
mModelView = m_mView * PVRTMat4::RotationY((float) sin(m_i32Frame * 0.003f) - PVRT_PI_OVER_TWOf);
glLoadMatrixf(mModelView.f);
DrawMesh(Node.nIdx);
// Disable the second layer of texturing
if(m_bDrawWithDot3)
{
glActiveTexture(GL_TEXTURE1);
glDisable(GL_TEXTURE_2D);
}
else
glDisable(GL_LIGHTING);
// Display info text
m_Print3D.DisplayDefaultTitle("PolyBump", m_bDrawWithDot3 ? m_pDescription : "Standard GL lighting" , ePVRTPrint3DSDKLogo);
m_Print3D.Flush();
// Increase frame counter
++m_i32Frame;
return true;
}
