//Program entry point.
//argc is a count of the number of arguments (including the filename of the program).
//argv is a pointer to each c-style string.
int main(int argc, char **argv)
{
atexit(cleanup);
cout << "Computer Graphics Assignment 1 Demo Program" << endl;
if (argc > 1)
{
geom.LoadFile(argv[1]);
}
else
{
cerr << "Usage:" << endl;
cerr << argv[0] << " <filename> " << endl;
exit(1);
}
geom.CalculateNormals();
//initialise OpenGL
GLFWwindow* window = initialiseGL();
//create framebuffers
glGenFramebuffers(1, &frameBuffer);
glBindFramebuffer(GL_FRAMEBUFFER, frameBuffer);
renderTarget = setupTextureGL(NULL, 800, 600, GL_RGBA);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, renderTarget, 0);
//depth/stencil buffer
glGenTextures(1, &depthStencil);
glBindTexture(GL_TEXTURE_2D, depthStencil);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8, 800, 600, 0, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
GLenum err = GL_NO_ERROR;
while ((err = glGetError()) != GL_NO_ERROR)
{
printf("%d\n", err);
}
//load and compile the shaders
GLuint objectVertexShader = loadVertexShaderGL("vertex.glsl");
GLuint objectFragmentShader = loadFragmentShaderGL("fragment.glsl");
objectShaderProgram = makeShaderProgramGL(objectVertexShader, objectFragmentShader);
GLuint screenVertexShader = loadVertexShaderGL("postvertex.glsl");
GLuint screenFragmentShader = loadFragmentShaderGL("postfragment.glsl");
screenShaderProgram = makeShaderProgramGL(screenVertexShader, screenFragmentShader);
//transfer the geometry to the GPU
glGenVertexArrays(1, &objectVertexArray);
glBindVertexArray(objectVertexArray);
//create buffers we will use
glGenBuffers(1, &objectVertexBuffer);
glGenBuffers(1, &objectElementBuffer);
glGenBuffers(1, &objectNormBuffer);
//get geometry vertices, normals and edge lists
vector <glm::vec3> vert = geom.Vertices();
vector <glm::vec3> norm = geom.Norms();
//vector <glm::vec2> uv=geom.UVs();
vector <Triangle> tri = geom.Triangles();
//transfer to GPU
//data for each vertex
glBindBuffer(GL_ARRAY_BUFFER, objectVertexBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 3 * vert.size(), &vert[0], GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, objectNormBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 3 * norm.size(), &norm[0], GL_STATIC_DRAW);
//element array (triangles)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, objectElementBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, tri.size() * 3 * sizeof(unsigned int), &tri[0], GL_STATIC_DRAW);
//setup for postprocessing
glGenVertexArrays(1, &screenVertexArray);
glBindVertexArray(screenVertexArray);
//create buffers we will use
glGenBuffers(1, &screenVertexBuffer);
glGenBuffers(1, &screenElementBuffer);
//data for each vertex
glBindBuffer(GL_ARRAY_BUFFER, screenVertexBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 2 * 4, &screenVertex[0], GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, screenElementBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 2 * 3 * sizeof(GLuint), &screenTri[0], GL_STATIC_DRAW);
//load the texture
readTexture();
texture = setupTextureGL(tex, 256, 256, GL_RGB);
//main loop
while (!glfwWindowShouldClose(window))
{
DemoDisplay();
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
}
int main(int argc, char **argv) {
atexit(cleanup);
// parse arguments
char *model_path = NULL;
char *vertexshader_path = NULL;
char *fragmentshader_path = NULL;
char *texture_path = NULL;
bool use_smoothed_normals;
if (argc >= 6) {
texture_path = argv[5];
useTexture = 1;
}
if (argc >= 5) {
model_path = argv[1];
vertexshader_path = argv[2];
fragmentshader_path = argv[3];
use_smoothed_normals = *argv[4] != '0';
} else {
std::cerr << "Usage:" << std::endl;
std::cerr << argv[0]
<< " <model::path> "
<< " <vertex-shader::path> "
<< " <fragment-shader::path> "
<< " <smooth-normals::{0,1}>"
<< " (<texture::path>)"
<< std::endl;
exit(1);
}
// initialise OpenGL
glutInit(&argc, argv);
glutInitWindowSize(windowX, windowY);
glutCreateWindow("CG-CW1");
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glEnable(GL_DEPTH_TEST);
// set display and keyboard callbacks
glutDisplayFunc(display_handler);
glutKeyboardFunc(keyboard_handler);
// initialise the OpenGL Extension Wrangler library for VBOs
GLenum err = glewInit();
if (err != GLEW_OK){
std::cerr << "Error!" << std::endl;
exit(1);
}
if (!GLEW_VERSION_2_1) {
std::cerr << "Error 2.1!" << std::endl;
exit(1);
}
// create shader, prepare data for OpenGL
trig.LoadFile(model_path);
shader.Init(vertexshader_path, fragmentshader_path);
setup_texture(texture_path, &textureID);
setup_vertex_position_buffer_object();
setup_vertex_uv_buffer_object();
setup_vertex_normal_buffer_object(use_smoothed_normals);
// set up camera and object transformation matrices
projectionMatrix = get_default_projectionMatrix();
viewMatrix = get_default_viewMatrix();
modelMatrix = get_default_modelMatrix();
normalMatrix = get_default_normalMatrix();
glutMainLoop();
}