Matrix4D Matrix4D::transpose( const Matrix4D& A )
{
return Matrix4D( A[0][0], A[0][1], A[0][2], A[0][3],
A[1][0], A[1][1], A[1][2], A[1][3],
A[2][0], A[2][1], A[2][2], A[2][3],
A[3][0], A[3][1], A[3][2], A[3][3] );
}
Matrix4D Matrix4D::matrixCompMult( const Matrix4D& A, const Matrix4D& B )
{
return Matrix4D( A[0][0]*B[0][0], A[0][1]*B[0][1], A[0][2]*B[0][2], A[0][3]*B[0][3],
A[1][0]*B[1][0], A[1][1]*B[1][1], A[1][2]*B[1][2], A[1][3]*B[1][3],
A[2][0]*B[2][0], A[2][1]*B[2][1], A[2][2]*B[2][2], A[2][3]*B[2][3],
A[3][0]*B[3][0], A[3][1]*B[3][1], A[3][2]*B[3][2], A[3][3]*B[3][3] );
}
Matrix4D ParametrizedEulerAnglesAndTranslation::getMatrix(void)
{
Point3D angles = value->eulerAngles;
Point3D trans = value->translate;
Matrix3D rotate = Matrix3D(angles);
return Matrix4D(rotate, trans);
}
Matrix4D ParametrizedQuaternionAndTranslation::getMatrix(void)
{
Quaternion q = value->quaternion;
Point3D trans = value->translate;
Matrix3D closestRot = Matrix3D(q);
return Matrix4D(closestRot, trans);
}
Matrix4D ParametrizedRotationLogarithmAndTranslation::getMatrix(void)
{
Matrix3D m = value->skewSymmetric;
Point3D trans = value->translate;
Matrix3D exp = Matrix3D::Exp(m, 100); //exponential
return Matrix4D(exp, trans);
}
Matrix4D ParametrizedClosestRotationAndTranslation::getMatrix(void)
{
Matrix3D notRotation = value->rotation;
Point3D trans = value->translate;
Matrix3D closestRotate = notRotation.closestRotation();
return Matrix4D(closestRotate, trans);
}
void ScreenSpaceAmbientOcclusionManager::generate_ssao_texture(Scene * scene) {
//Render scene normals and depth to a texture
glViewport(0, 0, viewport_width, viewport_height);
Matrix4D view = scene->set_view();
Matrix4D projection = scene->set_projection();
Matrix3D normal = glm::inverseTranspose(glm::mat3(view));
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frame_buffer_object);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, normal_depth_texture, 0);
check_frame_buffer();
glClearColor(0.f, 0.f, 0.f, 0.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shaders.select_shader(NORMAL_DEPTH_TEXTURE);
uint program = shaders.get_program_id(NORMAL_DEPTH_TEXTURE);
GLint projection_location = glGetUniformLocation(program, "projection");
glUniformMatrix4fv(projection_location, 1, GL_FALSE, &projection[0][0]);
GLint view_location = glGetUniformLocation(program, "view");
glUniformMatrix4fv(view_location, 1, GL_FALSE, &view[0][0]);
GLint normal_matrix_location = glGetUniformLocation(program, "normal_matrix");
glUniformMatrix3fv(normal_matrix_location, 1, GL_FALSE, &normal[0][0]);
scene->plain_render(view, program);
scene->render_floor(view, program);
shaders.select_shader(-1);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, normal_depth_texture);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
//Render SSAO to a texture
glViewport(0, 0, viewport_width, viewport_height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
view = Matrix4D(1.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
projection = glm::ortho(-1.0, 1.0, -1.0, 1.0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frame_buffer_object);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, ssao_texture, 0);
check_frame_buffer();
glClearColor(0.f, 0.f, 0.f, 0.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shaders.select_shader(separable ? SEPARABLE_SSAO : SSAO_TEXTURE);
glActiveTexture(GL_TEXTURE0);
bind_normal_depth_texture();
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, textures.getID(noise));
program = shaders.get_program_id(separable ? SEPARABLE_SSAO : SSAO_TEXTURE);
GLint sampler_reference = glGetUniformLocation(program, "sampler");
glUniform1i(sampler_reference, 0);
GLint noise_reference = glGetUniformLocation(program, "noise");
glUniform1i(noise_reference, 1);
GLint viewport_width_reference = glGetUniformLocation(program, "viewport_width");
glUniform1f(viewport_width_reference, viewport_width);
GLint viewport_height_reference = glGetUniformLocation(program, "viewport_height");
glUniform1f(viewport_height_reference, viewport_height);
GLint radius_reference = glGetUniformLocation(program, "radius_modifier");
glUniform1f(radius_reference, radius);
projection_location = glGetUniformLocation(program, "projection");
glUniformMatrix4fv(projection_location, 1, GL_FALSE, &projection[0][0]);
view_location = glGetUniformLocation(program, "view");
glUniformMatrix4fv(view_location, 1, GL_FALSE, &view[0][0]);
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_QUADS);
glVertex3f(-1, -1, -0.5);
glVertex3f(1, -1, -0.5);
glVertex3f(1, 1, -0.5);
glVertex3f(-1, 1, -0.5);
glEnd();
shaders.select_shader(-1);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, ssao_texture);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
//Blur the SSAO texture in X direction
glViewport(0, 0, viewport_width, viewport_height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frame_buffer_object);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, blurred_ssao_texture_x, 0);
check_frame_buffer();
glClearColor(0.f, 0.f, 0.f, 0.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shaders.select_shader(GAUSSIAN_X);
glActiveTexture(GL_TEXTURE0);
bind_ssao_texture();
program = shaders.get_program_id(GAUSSIAN_X);
sampler_reference = glGetUniformLocation(program, "sampler");
glUniform1i(sampler_reference, 0);
viewport_width_reference = glGetUniformLocation(program, "viewport_width");
glUniform1f(viewport_width_reference, viewport_width);
viewport_height_reference = glGetUniformLocation(program, "viewport_height");
glUniform1f(viewport_height_reference, viewport_height);
projection_location = glGetUniformLocation(program, "projection");
glUniformMatrix4fv(projection_location, 1, GL_FALSE, &projection[0][0]);
view_location = glGetUniformLocation(program, "view");
glUniformMatrix4fv(view_location, 1, GL_FALSE, &view[0][0]);
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_QUADS);
glVertex3f(-1, -1, -0.5);
glVertex3f(1, -1, -0.5);
glVertex3f(1, 1, -0.5);
glVertex3f(-1, 1, -0.5);
glEnd();
shaders.select_shader(-1);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, blurred_ssao_texture_x);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
//Blur the SSAO texture in Y direction
glViewport(0, 0, viewport_width, viewport_height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frame_buffer_object);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, blurred_ssao_texture_xy, 0);
check_frame_buffer();
glClearColor(0.f, 0.f, 0.f, 0.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shaders.select_shader(GAUSSIAN_Y);
glActiveTexture(GL_TEXTURE0);
bind_blurred_ssao_texture_x();
program = shaders.get_program_id(GAUSSIAN_Y);
sampler_reference = glGetUniformLocation(program, "sampler");
glUniform1i(sampler_reference, 0);
viewport_width_reference = glGetUniformLocation(program, "viewport_width");
glUniform1f(viewport_width_reference, viewport_width);
viewport_height_reference = glGetUniformLocation(program, "viewport_height");
glUniform1f(viewport_height_reference, viewport_height);
projection_location = glGetUniformLocation(program, "projection");
glUniformMatrix4fv(projection_location, 1, GL_FALSE, &projection[0][0]);
view_location = glGetUniformLocation(program, "view");
glUniformMatrix4fv(view_location, 1, GL_FALSE, &view[0][0]);
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_QUADS);
glVertex3f(-1, -1, -0.5);
glVertex3f(1, -1, -0.5);
glVertex3f(1, 1, -0.5);
glVertex3f(-1, 1, -0.5);
glEnd();
shaders.select_shader(-1);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, blurred_ssao_texture_xy);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
}
Matrix4D Matrix4D::operator * ( const float s ) const
{
return Matrix4D( s*m[0], s*m[1], s*m[2], s*m[3] );
}
Matrix4D Matrix4D::operator - ( const Matrix4D& n ) const
{
return Matrix4D( m[0]-n[0], m[1]-n[1], m[2]-n[2], m[3]-n[3] );
}
Matrix4D Matrix4D::operator + ( const Matrix4D& n ) const
{
return Matrix4D( m[0]+n[0], m[1]+n[1], m[2]+n[2], m[3]+n[3] );
}