void Camera::zoomCam(float zoom)
{
float zoomMat[16];
setTransMatrix(zoomMat, 0.0f, 0.0f, zoom);
multiplyMatrix(zoomMat, viewMatrix);
setIdentMatrix(viewMatrix, 4);
multiplyMatrix(viewMatrix, zoomMat);
}
// View Matrix
// just like glulookat
void placeCam(float posX, float posY, float posZ, float lookX, float lookY, float lookZ)
{
float dir[3], right[3], up[3];
up[0] = 0.0f; up[1] = 1.0f; up[2] = 0.0f;
dir[0] = (lookX - posX);
dir[1] = (lookY - posY);
dir[2] = (lookZ - posZ);
normalize(dir);
// this order matters
xProduct(dir,up,right);
normalize(right);
xProduct(right,dir,up);
normalize(up);
float aux[16];
viewMatrix[0] = right[0];
viewMatrix[1] = up[0];
viewMatrix[2] = -dir[0];
viewMatrix[3] = 0.0f;
viewMatrix[4] = right[1];
viewMatrix[5] = up[1];
viewMatrix[6] = -dir[1];
viewMatrix[7] = 0.0f;
viewMatrix[8] = right[2];
viewMatrix[9] = up[2];
viewMatrix[10] = -dir[2];
viewMatrix[11] = 0.0f;
viewMatrix[12] = 0.0f;
viewMatrix[13] = 0.0f;
viewMatrix[14] = 0.0f;
viewMatrix[15] = 1.0f;
normalMatrix[0] = viewMatrix[0];
normalMatrix[1] = viewMatrix[1];
normalMatrix[2] = viewMatrix[2];
normalMatrix[3] = viewMatrix[4];
normalMatrix[4] = viewMatrix[5];
normalMatrix[5] = viewMatrix[6];
normalMatrix[6] = viewMatrix[8];
normalMatrix[7] = viewMatrix[9];
normalMatrix[8] = viewMatrix[10];
setTransMatrix(aux, -posX, -posY, -posZ);
multiplyMatrix(viewMatrix, aux);
}
void renderScene(void) {
frame++;
time=glutGet(GLUT_ELAPSED_TIME);
if (MoveLight && (time - timebase2 > 10))
{
lightAngle = PI/36;
myMulti(lightPosition, rotationMatrix(0.0, 1.0, 0.0, lightAngle));
timebase2 = time;
}
if (time - timebase > 1000) {
sprintf(s,"FPS:%4.2f",
frame*1000.0/(time-timebase));
timebase = time;
frame = 0;
}
glutSetWindowTitle(s);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//placeCam(10,2,10,0,2,-5);
placeCam(viewPosition[0],viewPosition[1],viewPosition[2],0,0,-5);
multiplyMatrix(viewMatrix, rotationMatrix(0.0,1.0,0.0, angle));
multiplyMatrix(viewMatrix, rotationMatrix(1.0,0.0,0.0, angle2));
glUseProgram(p);
setUniforms();
glBindVertexArray(vert[0]);
glDrawArrays(GL_TRIANGLES, 0, sizeof(vertices1));
float T[16];
setScale(T,0.5,0.5,0.5);
multiplyMatrix(viewMatrix, T);
setTransMatrix(T,4,0,0);
multiplyMatrix(viewMatrix, T);
setUniforms();
glBindVertexArray(vert[1]);
glDrawArrays(GL_TRIANGLES, 0, sizeof(vertices1));
glutSwapBuffers();
}
// View Matrix
// just like glulookat
void Camera::placeCam(float posX, float posY, float posZ, float lookX, float lookY, float lookZ)
{
float dir[3], right[3], up[3];
up[0] = 0.0f; up[1] = 1.0f; up[2] = 0.0f;
dir[0] = (lookX - posX);
dir[1] = (lookY - posY);
dir[2] = (lookZ - posZ);
normalize(dir);
//zoom
//posX += dir[0]
// this order matters
xProduct(dir,up,right);
normalize(right);
xProduct(right,dir,up);
normalize(up);
float aux[16];
viewMatrix[0] = right[0];
viewMatrix[1] = up[0];
viewMatrix[2] = -dir[0];
viewMatrix[3] = 0.0f;
viewMatrix[4] = right[1];
viewMatrix[5] = up[1];
viewMatrix[6] = -dir[1];
viewMatrix[7] = 0.0f;
viewMatrix[8] = right[2];
viewMatrix[9] = up[2];
viewMatrix[10] = -dir[2];
viewMatrix[11] = 0.0f;
viewMatrix[12] = 0.0f;
viewMatrix[13] = 0.0f;
viewMatrix[14] = 0.0f;
viewMatrix[15] = 1.0f;
setTransMatrix(aux, -posX, -posY, -posZ);
multiplyMatrix(viewMatrix, aux);
// you should do this instead. If you want to apply rotation to your viewMatrix.
//multiplyMatrix(viewMatrix, rotationMatrix(0.0,0.0,1.0, 0.785));
}
