VECTOR4D VECTOR4D::GetRotatedAxis(double angle, const VECTOR3D & axis) const
{
VECTOR3D v3d(x, y, z);
v3d.RotateAxis(angle, axis);
return VECTOR4D(v3d.x, v3d.y, v3d.z, w);
}
VECTOR4D VECTOR4D::GetRotatedZ(double angle) const
{
VECTOR3D v3d(x, y, z);
v3d.RotateZ(angle);
return VECTOR4D(v3d.x, v3d.y, v3d.z, w);
}
//Perform per frame updates
void UpdateFrame(unsigned char key, int x, int y)
{
angle=(float)timer.GetTime()/25;
objectLightDirection=worldLightDirection.GetRotatedY(-angle);
objectViewDirection=worldViewDirection.GetRotatedY(-angle);
//update vertex program registers
//Light direction in c[4]
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 4, VECTOR4D(objectLightDirection.GetNormalized()));
//view direction in c[5]
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 5, VECTOR4D(objectViewDirection.GetNormalized()));
// //pause & unpause
// if(window.isKeyPressed('P'))
// timer.Pause();
//
// if(window.isKeyPressed('U'))
// timer.Unpause();
//
// //change technique
// if(window.isKeyPressed('1') && paths1And2Supported)
// currentTechnique=SINGLE_PASS;
//
// if(window.isKeyPressed('2') && paths1And2Supported)
// currentTechnique=TEXTURE_LOOKUP;
//
// if(window.isKeyPressed('3'))
// currentTechnique=FALLBACK;
//
// //toggle bumpy
// if(window.isKeyPressed('B'))
// showBumps=true;
//
// if(window.isKeyPressed('F'))
// showBumps=false;
}
//Called to draw scene
void Display(void)
{
//angle of spheres in scene. Calculate from time
float angle=timer.GetTime()/10;
//First pass - from light's point of view
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf(lightProjectionMatrix);
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf(lightViewMatrix);
//Use viewport the same size as the shadow map
glViewport(0, 0, shadowMapSize, shadowMapSize);
//Draw back faces into the shadow map
glCullFace(GL_FRONT);
//Disable color writes, and use flat shading for speed
glShadeModel(GL_FLAT);
glColorMask(0, 0, 0, 0);
//Draw the scene
DrawScene(angle);
//Read the depth buffer into the shadow map texture
glBindTexture(GL_TEXTURE_2D, shadowMapTexture);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, shadowMapSize, shadowMapSize);
//restore states
glCullFace(GL_BACK);
glShadeModel(GL_SMOOTH);
glColorMask(1, 1, 1, 1);
//2nd pass - Draw from camera's point of view
glClear(GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf(cameraProjectionMatrix);
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf(cameraViewMatrix);
glViewport(0, 0, windowWidth, windowHeight);
//Use dim light to represent shadowed areas
glLightfv(GL_LIGHT1, GL_POSITION, VECTOR4D(lightPosition));
glLightfv(GL_LIGHT1, GL_AMBIENT, white*0.2f);
glLightfv(GL_LIGHT1, GL_DIFFUSE, white*0.2f);
glLightfv(GL_LIGHT1, GL_SPECULAR, black);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHTING);
DrawScene(angle);
//3rd pass
//Draw with bright light
glLightfv(GL_LIGHT1, GL_DIFFUSE, white);
glLightfv(GL_LIGHT1, GL_SPECULAR, white);
//Calculate texture matrix for projection
//This matrix takes us from eye space to the light's clip space
//It is postmultiplied by the inverse of the current view matrix when specifying texgen
static MATRIX4X4 biasMatrix(0.5f, 0.0f, 0.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f,
0.0f, 0.0f, 0.5f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f); //bias from [-1, 1] to [0, 1]
MATRIX4X4 textureMatrix=biasMatrix*lightProjectionMatrix*lightViewMatrix;
//MATRIX4X4 textureMatrix=lightProjectionMatrix*lightViewMatrix;
//Set up texture coordinate generation.
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_S, GL_EYE_PLANE, textureMatrix.GetRow(0));
glEnable(GL_TEXTURE_GEN_S);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_T, GL_EYE_PLANE, textureMatrix.GetRow(1));
glEnable(GL_TEXTURE_GEN_T);
glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_R, GL_EYE_PLANE, textureMatrix.GetRow(2));
glEnable(GL_TEXTURE_GEN_R);
glTexGeni(GL_Q, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_Q, GL_EYE_PLANE, textureMatrix.GetRow(3));
glEnable(GL_TEXTURE_GEN_Q);
//Bind & enable shadow map texture
glBindTexture(GL_TEXTURE_2D, shadowMapTexture);
glEnable(GL_TEXTURE_2D);
//Enable shadow comparison
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_COMPARE_R_TO_TEXTURE);
//Shadow comparison should be true (ie not in shadow) if r<=texture
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB, GL_LEQUAL);
//Shadow comparison should generate an INTENSITY result
glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE_ARB, GL_INTENSITY);
//Set alpha test to discard false comparisons
glAlphaFunc(GL_GEQUAL, 0.99f);
glEnable(GL_ALPHA_TEST);
DrawScene(angle);
//Disable textures and texgen
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
glDisable(GL_TEXTURE_GEN_R);
glDisable(GL_TEXTURE_GEN_Q);
//Restore other states
glDisable(GL_LIGHTING);
glDisable(GL_ALPHA_TEST);
//Update frames per second counter
fpsCounter.Update();
//Print fps
static char fpsString[32];
sprintf(fpsString, "%.2f", fpsCounter.GetFps());
//Set matrices for ortho
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(-1.0f, 1.0f, -1.0f, 1.0f);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
//Print text
glRasterPos2f(-1.0f, 0.9f);
for(unsigned int i=0; i<strlen(fpsString); ++i)
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, fpsString[i]);
//reset matrices
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glFinish();
glutSwapBuffers();
glutPostRedisplay();
}
//Render a frame
void RenderFrame(double currentTime, double timePassed)
{
//Clear buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity(); //reset modelview matrix
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
gluLookAt( 0.0f, 1.8f, 1.8f,
0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0);
//Enable texture
glBindTexture(GL_TEXTURE_2D, floorTexture);
glEnable(GL_TEXTURE_2D);
//Set up vertex arrays
glVertexPointer(3, GL_FLOAT, sizeof(SIMPLE_VERTEX), &vertices[0].position);
glEnableClientState(GL_VERTEX_ARRAY);
glNormalPointer(GL_FLOAT, sizeof(SIMPLE_VERTEX), &vertices[0].normal);
glEnableClientState(GL_NORMAL_ARRAY);
glTexCoordPointer(2, GL_FLOAT, sizeof(SIMPLE_VERTEX), &vertices[0].texCoords);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
//Use Fixed Function Pipeline
if(useFixedFunction)
{
//Set parameters for GL lighting
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, white*0.1f); //global ambient
glMaterialfv(GL_FRONT, GL_AMBIENT, white);
glMaterialfv(GL_FRONT, GL_DIFFUSE, white);
glEnable(GL_LIGHTING);
//8 passes, dealing with 8 lights at a time, except final pass where we do 4
for(int i=0; i<8; ++i)
{
int numLightsThisPass=8;
if(i==7)
numLightsThisPass=4;
//Set up lights
for(int j=0; j<numLightsThisPass; ++j)
{
glLightfv(GL_LIGHT0+j, GL_POSITION, VECTOR4D(lights[i*8+j].position));
glLightfv(GL_LIGHT0+j, GL_DIFFUSE, lights[i*8+j].color);
glEnable(GL_LIGHT0+j);
}
//If this is the final pass, disable lights 4-7
if(i==7)
for(int j=4; j<7; ++j)
glDisable(GL_LIGHT0+j);
//Enable additive blend for all passes except the first
if(i!=0)
{
glBlendFunc(GL_ONE, GL_ONE);
glEnable(GL_BLEND);
//if this is not the first pass, no ambient
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, black);
}
//Draw grid as triangle strips
for(int j=0; j<gridDensity-1; ++j)
glDrawElements( GL_TRIANGLE_STRIP, gridDensity*2,
GL_UNSIGNED_INT, &indices[j*gridDensity*2]);
}
//Disable lights
for(int j=0; j<7; ++j)
glDisable(GL_LIGHT0+j);
glDisable(GL_LIGHTING);
glDisable(GL_BLEND);
}
//Use vp1
if(useVP1)
{
//Bind program
glBindProgramNV(GL_VERTEX_PROGRAM_NV, vp1);
glEnable(GL_VERTEX_PROGRAM_NV);
//3 passes, dealing with 20 lights at a time
for(int i=0; i<3; ++i)
{
//Send ambient brightness as c[4]
//Only send this for the first pass
if(i==0)
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 4, white*0.1f);
else
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 4, black);
//Update program parameters 5&6 for light0, 7&8 for light1, etc
for(int j=0; j<20; ++j)
{
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+5,
VECTOR4D(lights[i*20+j].position));
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+6,
lights[i*20+j].color);
}
//Enable additive blend for passes except the first
if(i>0)
{
glBlendFunc(GL_ONE, GL_ONE);
glEnable(GL_BLEND);
}
//Draw grid as triangle strips
for(int j=0; j<gridDensity-1; ++j)
glDrawElements( GL_TRIANGLE_STRIP, gridDensity*2,
GL_UNSIGNED_INT, &indices[j*gridDensity*2]);
}
glDisable(GL_VERTEX_PROGRAM_NV);
glDisable(GL_BLEND);
}
//Use vp2
if(useVP2)
{
//Bind program
glBindProgramNV(GL_VERTEX_PROGRAM_NV, vp2);
glEnable(GL_VERTEX_PROGRAM_NV);
//Send ambient brightness as c[4]
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 4, white*0.1f);
//Update program parameters 5&6 for light0, 7&8 for light1, etc
for(int j=0; j<60; ++j)
{
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+5,
VECTOR4D(lights[j].position));
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+6,
lights[j].color);
}
//Send loop parameters to c[125]
glProgramParameter4fNV(GL_VERTEX_PROGRAM_NV, 125, 60.0, //number of lights
5.0, //base offset of light data
-1.0,
2.0);//num parameters between lights
//Draw grid as triangle strips
for(int j=0; j<gridDensity-1; ++j)
glDrawElements( GL_TRIANGLE_STRIP, gridDensity*2,
GL_UNSIGNED_INT, &indices[j*gridDensity*2]);
glDisable(GL_VERTEX_PROGRAM_NV);
}
//reset states
glDisable(GL_TEXTURE_2D);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
fpsCounter.Update();
//Print text
font.StartTextMode();
glColor4f(0.0f, 1.0f, 0.0f, 1.0f);
font.Print(0, 28, "FPS: %.2f", fpsCounter.GetFps());
glColor4f(1.0f, 0.0f, 0.0f, 0.0f);
if(useVP1)
font.Print(0, 48, "Using NV_vertex_program");
if(useVP2)
font.Print(0, 48, "Using NV_vertex_program2");
if(useFixedFunction)
font.Print(0, 48, "Using Fixed Function Pipeline");
font.EndTextMode();
WINDOW::Instance()->SwapBuffers();
//Save a screenshot
if(WINDOW::Instance()->IsKeyPressed(VK_F1))
{
WINDOW::Instance()->SaveScreenshot();
WINDOW::Instance()->SetKeyReleased(VK_F1);
}
//Check for an openGL error
WINDOW::Instance()->CheckGLError();
//quit if necessary
if(WINDOW::Instance()->IsKeyPressed(VK_ESCAPE))
PostQuitMessage(0);
}
//Called to draw scene
void Display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
//use gluLookAt to look at torus
gluLookAt( 0.0f,10.0f,10.0f,
0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f);
//rotate torus
static float angle=0.0f;
angle+=0.1f;
glRotatef(angle, 0.0f, 1.0f, 0.0f);
//Get the inverse model matrix
MATRIX4X4 inverseModelMatrix;
glPushMatrix();
glLoadIdentity();
glRotatef(-angle, 0.0f, 1.0f, 0.0f);
glGetFloatv(GL_MODELVIEW_MATRIX, inverseModelMatrix);
glPopMatrix();
//Get the object space light vector
VECTOR3D objectLightPosition=inverseModelMatrix*worldLightPosition;
//Loop through vertices
for(int i=0; i<torus.numVertices; ++i)
{
VECTOR3D lightVector=objectLightPosition-torus.vertices[i].position;
//Calculate tangent space light vector
torus.vertices[i].tangentSpaceLight.x=
torus.vertices[i].sTangent.DotProduct(lightVector);
torus.vertices[i].tangentSpaceLight.y=
torus.vertices[i].tTangent.DotProduct(lightVector);
torus.vertices[i].tangentSpaceLight.z=
torus.vertices[i].normal.DotProduct(lightVector);
}
//Draw bump pass
if(drawBumps)
{
//Bind normal map to texture unit 0
glBindTexture(GL_TEXTURE_2D, normalMap);
glEnable(GL_TEXTURE_2D);
//Bind normalisation cube map to texture unit 1
glActiveTexture(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, normalisationCubeMap);
glEnable(GL_TEXTURE_CUBE_MAP_ARB);
glActiveTextureARB(GL_TEXTURE0_ARB);
//Set vertex arrays for torus
glVertexPointer(3, GL_FLOAT, sizeof(TORUS_VERTEX), &torus.vertices[0].position);
glEnableClientState(GL_VERTEX_ARRAY);
//Send texture coords for normal map to unit 0
glTexCoordPointer(2, GL_FLOAT, sizeof(TORUS_VERTEX), &torus.vertices[0].s);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
//Send tangent space light vectors for normalisation to unit 1
glClientActiveTexture(GL_TEXTURE1_ARB);
glTexCoordPointer(3, GL_FLOAT, sizeof(TORUS_VERTEX), &torus.vertices[0].tangentSpaceLight);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glClientActiveTexture(GL_TEXTURE0_ARB);
//Set up texture environment to do (tex0 dot tex1)*color
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_REPLACE);
glActiveTextureARB(GL_TEXTURE1_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_DOT3_RGB_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);
glActiveTextureARB(GL_TEXTURE0_ARB);
//Draw torus
glDrawElements(GL_TRIANGLES, torus.numIndices, GL_UNSIGNED_INT, torus.indices);
//Disable textures
glDisable(GL_TEXTURE_2D);
glActiveTextureARB(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_CUBE_MAP_ARB);
glActiveTextureARB(GL_TEXTURE0_ARB);
//disable vertex arrays
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glClientActiveTexture(GL_TEXTURE1_ARB);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glClientActiveTexture(GL_TEXTURE0_ARB);
//Return to standard modulate texenv
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
//If we are drawing both passes, enable blending to multiply them together
if(drawBumps && drawColor)
{
//Enable multiplicative blending
glBlendFunc(GL_DST_COLOR, GL_ZERO);
glEnable(GL_BLEND);
}
//Perform a second pass to color the torus
if(drawColor)
{
if(!drawBumps)
{
glLightfv(GL_LIGHT1, GL_POSITION, VECTOR4D(objectLightPosition));
glLightfv(GL_LIGHT1, GL_DIFFUSE, white);
glLightfv(GL_LIGHT1, GL_AMBIENT, black);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, black);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHTING);
glMaterialfv(GL_FRONT, GL_DIFFUSE, white);
}
//Bind decal texture
glBindTexture(GL_TEXTURE_2D, decalTexture);
glEnable(GL_TEXTURE_2D);
//Set vertex arrays for torus
glVertexPointer(3, GL_FLOAT, sizeof(TORUS_VERTEX), &torus.vertices[0].position);
glEnableClientState(GL_VERTEX_ARRAY);
glNormalPointer(GL_FLOAT, sizeof(TORUS_VERTEX), &torus.vertices[0].normal);
glEnableClientState(GL_NORMAL_ARRAY);
glTexCoordPointer(2, GL_FLOAT, sizeof(TORUS_VERTEX), &torus.vertices[0].s);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
//Draw torus
glDrawElements(GL_TRIANGLES, torus.numIndices, GL_UNSIGNED_INT, torus.indices);
if(!drawBumps)
glDisable(GL_LIGHTING);
//Disable texture
glDisable(GL_TEXTURE_2D);
//disable vertex arrays
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
//Disable blending if it is enabled
if(drawBumps && drawColor)
glDisable(GL_BLEND);
glFinish();
glutSwapBuffers();
glutPostRedisplay();
}
