Integrate Assignment 1 Part B with Assignment 2a Part A, so that we can display the Sierpinski Gasket at the user's mouse positions. I can't seem to integrate them correctly, I am making the triangles on a callback button but its displaying random triangles rather than a serpinski gasket on the mouse click. /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// //Assignment 1B //Two-Dimensional Sierpinski Gasket // Generated using randomly selected vertices and bisection #include "GL/glew.h" #include  #include  #include "GLFW/glfw3.h" const int NumPoints = 5000; //GLfloat points[NumPoints]; GLuint shader_programme; GLuint vao; //---------------------------------------------------------------------------- void init( void ) { GLuint vert_shader, frag_shader; /* GL shader programme object [combined, to link] */ // Specifiy the vertices for a triangle GLfloat vertices[] = { -1.0f, -1.0f, 0.0f, 1.0f, 1.0f, -1.0f }; GLfloat points[NumPoints*2]; points[0] = 0.25; points[1] = 0.5; for (int i = 2; i < NumPoints*2; i+=2) { int j = rand()%3; // pick a vertex at random // Compute the point halfway between the selected vertex // and the previous point points[i] = (points[i - 2] + vertices[2*j]) / 2.0; points[i+1] = (points[i - 1] + vertices[2 * j+1]) / 2.0; } // Create and initialize a buffer object GLuint buffer; glGenBuffers( 1, &buffer ); glBindBuffer( GL_ARRAY_BUFFER, buffer ); glBufferData( GL_ARRAY_BUFFER, sizeof(points), points, GL_STATIC_DRAW ); // Create a vertex array object glGenVertexArrays(1, &vao); glBindVertexArray(vao); glEnableVertexAttribArray(0); glBindBuffer(GL_ARRAY_BUFFER, buffer); // "attribute #0 is created from every 2 variables in the above buffer, of type // float (i.e. make me vec2s)" glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL); // Load shaders and use the resulting shader program const char *vertex_shader = "#version 410 " "in vec4 vPosition;" "void main () {" " gl_Position = vPosition;" "}"; /* the fragment shader colours each fragment (pixel-sized area of the triangle) */ const char *fragment_shader = "#version 410 " "out vec4 FragColor;" "void main () {" " FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );" "}"; vert_shader = glCreateShader(GL_VERTEX_SHADER); glShaderSource(vert_shader, 1, &vertex_shader, NULL); glCompileShader(vert_shader); frag_shader = glCreateShader(GL_FRAGMENT_SHADER); glShaderSource(frag_shader, 1, &fragment_shader, NULL); glCompileShader(frag_shader); shader_programme = glCreateProgram(); glAttachShader(shader_programme, frag_shader); glAttachShader(shader_programme, vert_shader); glLinkProgram(shader_programme); } //---------------------------------------------------------------------------- int main( int argc, char **argv ) { GLFWwindow *window = NULL; const GLubyte *renderer; const GLubyte *version; /* start GL context and O/S window using the GLFW helper library */ if (!glfwInit()) { fprintf(stderr, "ERROR: could not start GLFW3 "); return 1; } /* We must specify 3.2 core if on Apple OS X -- other O/S can specify anything here. I defined 'APPLE' in the makefile for OS X Remove the #ifdef #endif and play around with this - you should be starting an explicit version anyway, and some non-Apple drivers will require this too. */ //#ifdef APPLE glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2); glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); //#endif window = glfwCreateWindow(640, 480, "Sierpinski Gasket", NULL, NULL); if (!window) { fprintf(stderr, "ERROR: could not open window with GLFW3 "); glfwTerminate(); return 1; } glfwMakeContextCurrent(window); /* start GLEW extension handler */ glewExperimental = GL_TRUE; glewInit(); renderer = glGetString(GL_RENDERER); /* get renderer string */ version = glGetString(GL_VERSION); /* version as a string */ printf("Renderer: %s ", renderer); printf("OpenGL version supported %s ", version); init(); do{ glClear(GL_COLOR_BUFFER_BIT); // clear the window glUseProgram(shader_programme); glBindVertexArray(vao); glDrawArrays(GL_POINTS, 0, NumPoints ); // draw the points /* update other events like input handling */ glfwPollEvents(); glfwSwapBuffers(window); } while (!glfwWindowShouldClose(window)); // Close OpenGL window and terminate GLFW glfwTerminate(); return 0; } 

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// Assignment 2A Part A // DrawSquare.cpp // Generate a square on a solid background at users mouse position #include "GL/glew.h" #include  #include  #include "GLFW/glfw3.h" GLuint shader_programme; GLuint vao; GLfloat points[200]; int w; int i = 6; GLfloat size = 20; int cnt = 3; GLuint buffer; //---------------------------------------------------------------------------- void init( void ) { GLuint vert_shader, frag_shader; /* GL shader programme object [combined, to link] */ // Specifiy the vertices for a triangle //GLfloat points[] = { -0.5, 0.5, 0.5, 0.5, 0.0, -0.5 }; // Create and initialize a buffer object glGenBuffers( 1, &buffer ); glBindBuffer( GL_ARRAY_BUFFER, buffer ); glBufferData( GL_ARRAY_BUFFER, sizeof(points), points, GL_STATIC_DRAW ); // Create a vertex array object glGenVertexArrays(1, &vao); glBindVertexArray(vao); glEnableVertexAttribArray(0); glBindBuffer(GL_ARRAY_BUFFER, buffer); // "attribute #0 is created from every 2 variables in the above buffer, of type // float (i.e. make me vec2s)" glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL); // Load shaders and use the resulting shader program const char *vertex_shader = "#version 410 " "in vec4 vPosition;" "void main () {" " gl_Position = vPosition;" "}"; /* the fragment shader colours each fragment (pixel-sized area of the triangle) */ const char *fragment_shader = "#version 410 " "out vec4 FragColor;" "void main () {" " FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );" "}"; vert_shader = glCreateShader(GL_VERTEX_SHADER); glShaderSource(vert_shader, 1, &vertex_shader, NULL); glCompileShader(vert_shader); frag_shader = glCreateShader(GL_FRAGMENT_SHADER); glShaderSource(frag_shader, 1, &fragment_shader, NULL); glCompileShader(frag_shader); shader_programme = glCreateProgram(); glAttachShader(shader_programme, frag_shader); glAttachShader(shader_programme, vert_shader); glLinkProgram(shader_programme); } void drawSquare(int x, int y) { //y = w - y; /* invert y position */ points[i] = (2.0f * (x+size) / w )- 1.0f; points[i + 1] = 1.0f - (2.0f * (y+size)) / w;; points[i + 2] = (2.0f * (x - size) / w) - 1.0f; points[i + 3] = 1.0f - (2.0f * (y + size)) / w;; points[i + 4] = (2.0f * (x + size) / w) - 1.0f; points[i + 5] = 1.0f - (2.0f * (y - size)) / w;; points[i + 6] = (2.0f * (x - size) / w) - 1.0f; points[i + 7] = 1.0f - (2.0f * (y + size)) / w;; points[i + 8] = (2.0f * (x + size) / w) - 1.0f; points[i + 9] = 1.0f - (2.0f * (y - size)) / w;; points[i + 10] = (2.0f * (x - size) / w) - 1.0f; points[i + 11] = 1.0f - (2.0f * (y - size)) / w; //points[i] = -0.5; //points[i + 1] = 0.5; //points[i + 2] = 0.5; //points[i + 3] = 0.5; //points[i + 4] = 0.0; //points[i + 5] = -0.5; //points[i + 6] = 0; //points[i + 7] = 0; //points[i + 8] = 0; //points[i + 9] = 0; //points[i + 10] = 0; //points[i + 11] = 0; i += 12; cnt+=6; } void mymouse(GLFWwindow* window, int button, int action, int mods){ if (GLFW_PRESS == action) { double x, y; glfwGetCursorPos(window, &x, &y); drawSquare(x, y); //glGenBuffers(1, &buffer); glBindBuffer(GL_ARRAY_BUFFER, buffer); glBufferData(GL_ARRAY_BUFFER, sizeof(points), points, GL_STATIC_DRAW); //glGenVertexArrays(1, &vao); glBindBuffer(GL_ARRAY_BUFFER, buffer); // "attribute #0 is created from every 2 variables in the above buffer, of type // float (i.e. make me vec2s)" glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL); } } //---------------------------------------------------------------------------- int main( int argc, char **argv ) { GLFWwindow *window = NULL; const GLubyte *renderer; const GLubyte *version; /* start GL context and O/S window using the GLFW helper library */ if (!glfwInit()) { fprintf(stderr, "ERROR: could not start GLFW3 "); return 1; } /* We must specify 3.2 core if on Apple OS X -- other O/S can specify anything here. I defined 'APPLE' in the makefile for OS X Remove the #ifdef #endif and play around with this - you should be starting an explicit version anyway, and some non-Apple drivers will require this too. */ #ifdef APPLE glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2); glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); #endif window = glfwCreateWindow(640, 640, "simple", NULL, NULL); w = 640; if (!window) { fprintf(stderr, "ERROR: could not open window with GLFW3 "); glfwTerminate(); return 1; } glfwMakeContextCurrent(window); /* start GLEW extension handler */ glewExperimental = GL_TRUE; glewInit(); renderer = glGetString(GL_RENDERER); /* get renderer string */ version = glGetString(GL_VERSION); /* version as a string */ printf("Renderer: %s ", renderer); printf("OpenGL version supported %s ", version); init(); glfwSetMouseButtonCallback(window, mymouse); do{ glClear(GL_COLOR_BUFFER_BIT); // clear the window glUseProgram(shader_programme); glBindVertexArray(vao); glDrawArrays(GL_TRIANGLES, 0, cnt ); // draw the points /* update other events like input handling */ glfwPollEvents(); glfwSwapBuffers(window); } while (!glfwWindowShouldClose(window)); // Close OpenGL window and terminate GLFW glfwTerminate(); return 0; } 

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