void
deletePBO(GLuint *pbo)
{
glDeleteBuffers(1, pbo);
SDK_CHECK_ERROR_GL();
*pbo = 0;
}
int main(){
//Change this line to use your name!
yourName = "Paul Gurniak";
// Needed in OSX to force use of OpenGL3.2
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2);
glfwOpenWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
init();
initCuda();
SDK_CHECK_ERROR_GL();
initVAO();
initTextures();
GLuint passthroughProgram;
passthroughProgram = initShader("shaders/passthroughVS.glsl", "shaders/passthroughFS.glsl");
glUseProgram(passthroughProgram);
glActiveTexture(GL_TEXTURE0);
// send into GLFW main loop
while(1){
display();
if (glfwGetKey(GLFW_KEY_ESC) == GLFW_PRESS || !glfwGetWindowParam( GLFW_OPENED )){
exit(0);
}
}
glfwTerminate();
return 0;
}
void Renderer::initPBO() {
// initialize the PBO for transferring data from CUDA to openGL
uint num_texels = image_width * image_height;
uint size_tex_data = sizeof(GLubyte) * num_texels * 4;
void *data = malloc(size_tex_data);
// test init buffer
for (int i=0; i<size_tex_data; i+=4) {
uchar *datam = (uchar*)data;
datam[i+0] = 0;
datam[i+1] = 0;
datam[i+2] = 255.0 * i / (float)size_tex_data;
datam[i+3] = 255;
}
// create buffer object
glGenBuffers(1, &pbo);
glBindBuffer(GL_ARRAY_BUFFER, pbo);
glBufferData(GL_ARRAY_BUFFER, size_tex_data, data, GL_DYNAMIC_DRAW);
free(data);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// register this buffer object with CUDA
checkCudaErrors(cudaGLRegisterBufferObject(pbo));
SDK_CHECK_ERROR_GL();
// create the texture that we use to visualize the ray-tracing result
glActiveTexture(GL_TEXTURE0 + RENDER_TEXTURE);
glGenTextures(1, &result_texture);
glBindTexture(GL_TEXTURE_2D, result_texture);
// set basic parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
// buffer data
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image_width, image_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
SDK_CHECK_ERROR_GL();
// unbind
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE0 + UNUSED_TEXTURE);
}
void Renderer::render(const Camera& camera, float time) {
// calc cam vars
glm::vec3 A,B,C;
{
// camera ray
C = glm::normalize(camera.getLookAt()-camera.getPosition());
// calc A (screen x)
// calc B (screen y) then scale down relative to aspect
// fov is for screen x axis
A = glm::normalize(glm::cross(C,camera.getUp()));
B = 1.0f/camera.getAspect()*glm::normalize(glm::cross(A,C));
// scale by FOV
float tanFOV = tan(glm::radians(camera.getFOV()));
A *= tanFOV;
B *= tanFOV;
}
// cuda call
unsigned int* out_data;
checkCudaErrors(cudaGLMapBufferObject((void**)&out_data, pbo));
if (mode == RAYTRACE) {
raytrace1(out_data, image_width, image_height, time,
camera.getPosition(), A, B, C,
scene_d, sceneSize);
}
else if (mode == PATHTRACE) {
++filmIters;
pathtrace(out_data, image_width, image_height, time,
camera.getPosition(), A, B, C,
camera.m_lensRadius, camera.m_focalDist,
scene_d, sceneSize,
rand_d, rays_d, col_d, idx_d,
film_d, filmIters);
}
checkCudaErrors(cudaGLUnmapBufferObject(pbo));
// download texture from destination PBO
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
glActiveTexture(GL_TEXTURE0 + RENDER_TEXTURE);
glBindTexture(GL_TEXTURE_2D, result_texture);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, image_width, image_height, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glActiveTexture(GL_TEXTURE0 + UNUSED_TEXTURE);
SDK_CHECK_ERROR_GL();
fullScreenQuad.display();
}
void CreateVBO(GLuint *vbo, struct cudaGraphicsResource **resource, unsigned int vbo_res_flags)
{
assert(vbo);
// create buffer object
glGenBuffers(1, vbo);
glBindBuffer(GL_ARRAY_BUFFER, *vbo);
// initialize buffer object
unsigned int size = MeshWidth * MeshHeight * 4 * sizeof(float);
glBufferData(GL_ARRAY_BUFFER, size, 0, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// register this buffer object with CUDA
checkCudaErrors(cudaGraphicsGLRegisterBuffer(resource, *vbo, vbo_res_flags), exit(0));
SDK_CHECK_ERROR_GL();
}
////////////////////////////////////////////////////////////////////////////////
//! Initialize GL
////////////////////////////////////////////////////////////////////////////////
bool initGL(int *argc, char **argv)
{
glutInit(argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutInitWindowSize(world_width, world_height);
glutCreateWindow("MPI Cuda GL Interop (VBO)");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMotionFunc(motion);
glutTimerFunc(REFRESH_DELAY, timerEvent,0);
// initialize necessary OpenGL extensions
glewInit();
if (! glewIsSupported("GL_VERSION_2_0 "))
{
fprintf(stderr, "ERROR: Support for necessary OpenGL extensions missing.");
fflush(stderr);
return false;
}
// default initialization
glClearColor(0.0, 0.0, 0.0, 1.0);
glDisable(GL_DEPTH_TEST);
// viewport
glViewport(0, 0, world_width, world_height);
// projection
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//gluPerspective(60.0, (GLfloat)window_width / (GLfloat) window_height, 0.1, 10.0);
gluPerspective(60.0, (GLfloat)world_width / (GLfloat) world_height, 0.1, 1024.0); //HPV se cambio de 10 a 1024 el ultimo campo ZFar
glTranslated(-256, -256, -700); //HPV Se cambia la longitud de alcance de vision con ZFar y tmb el sistema de coordenadas
SDK_CHECK_ERROR_GL();
return true;
}
////////////////////////////////////////////////////////////////////////////////
//! Create PBO
////////////////////////////////////////////////////////////////////////////////
void
createPBO(GLuint *pbo, struct cudaGraphicsResource **pbo_resource)
{
// set up vertex data parameter
num_texels = image_width * image_height;
num_values = num_texels * 4;
size_tex_data = sizeof(GLubyte) * num_values;
void *data = malloc(size_tex_data);
// create buffer object
glGenBuffers(1, pbo);
glBindBuffer(GL_ARRAY_BUFFER, *pbo);
glBufferData(GL_ARRAY_BUFFER, size_tex_data, data, GL_DYNAMIC_DRAW);
free(data);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// register this buffer object with CUDA
checkCudaErrors(cudaGraphicsGLRegisterBuffer(pbo_resource, *pbo, cudaGraphicsMapFlagsNone));
SDK_CHECK_ERROR_GL();
}
