SER332 Lecture 24

Introduction to Graphics and Game Development
Coding Review
(201804)

Transcript

1. jgs
   SER332
   Introduction to Graphics and Game
   Development
   Lecture 24: Coding Review
   Javier Gonzalez-Sanchez
   javiergs@asu.edu
   PERALTA 230U
   Office Hours: By appointment
   

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2. Javier Gonzalez-Sanchez | SER332 | Spring 2018 | 2
   jgs
   Main
   // MAIN
   void main(int argc, char* argv[]) {
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
   glutInitWindowPosition(0, 0);
   glutInitWindowSize(WIDTH, HEIGHT);
   glutCreateWindow("Coding review");
   // CALLBACK
   glutDisplayFunc(display);
   // SHADE AND DEPTH
   glShadeModel(GL_SMOOTH);
   glEnable(GL_DEPTH_TEST);
   // LIGHT
   GLfloat light_position[] = { 0.0, 0.0, 1.0, 0.0 };
   glLightfv(GL_LIGHT0, GL_POSITION, light_position);
   glEnable(GL_LIGHT0);
   glEnable(GL_LIGHTING);
   // LOOP
   glutMainLoop();
   }
   

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3. Javier Gonzalez-Sanchez | SER332 | Spring 2018 | 3
   jgs
   Create Texture
   // TEXTURE
   GLuint texture_from_algorithm() {
   GLuint texture;
   const int TexHeight = 128;
   const int TexWidth = 128;
   GLubyte textureImage[TexHeight][TexWidth][3];
   for (int i = 0; i < TexHeight; i++)
   for (int j = 0; j < TexWidth; j++) {
   textureImage[i][j][0] = 127 + i;
   textureImage[i][j][1] = 0;
   textureImage[i][j][2] = 127 + j;
   }
   glGenTextures(1, &texture);
   glBindTexture(GL_TEXTURE_2D, texture);
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
   gluBuild2DMipmaps(GL_TEXTURE_2D, 3, TexWidth, TexHeight,
   GL_BGR_EXT, GL_UNSIGNED_BYTE, textureImage);
   return texture;
   }
   

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4. Javier Gonzalez-Sanchez | SER332 | Spring 2018 | 4
   jgs
   Display Callback
   // DISPLAY
   void display(void) {
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   // PROJECTION
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glViewport(0, 0, WIDTH, HEIGHT);
   gluPerspective(45, 1, 1, 1000);
   // VIEW
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   // LOOKAT
   gluLookAt(0.0f, 40.0f, 320.0, 0.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f);
   // SQUARE
   glEnable(GL_TEXTURE_2D);
   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
   glBindTexture(GL_TEXTURE_2D, texture_from_algorithm());
   

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5. jgs
   Javier Gonzalez-Sanchez | SER332 | Spring 2018 | 5
   glBegin(GL_TRIANGLES);
   glVertex3f(0.0, 50.0, 50.0);
   glNormal3f(0.0, 0.0, 1.0);
   glVertex3f(50.0,50.0, 50.0);
   glNormal3f( 0.0, 0.0, 1.0);
   glVertex3f(50.0, 0.0, 50.0);
   glNormal3f( 0.0, 0.0, 1.0);
   glVertex3f(50.0, 0.0, 50.0);
   glNormal3f(0.0, 0.0, 1.0);
   glVertex3f(0.0, 0.0, 50.0);
   glNormal3f(0.0, 0.0, 1.0);
   glVertex3f(0.0, 50.0, 50.0);
   glNormal3f(0.0, 0.0, 1.0);
   glTexCoord2f(0.0, 1.0);
   glTexCoord2f(1.0, 1.0);
   glTexCoord2f(1.0, 0.0);
   glTexCoord2f(0.0, 0.0);
   glEnd();
   glDisable(GL_TEXTURE_2D);
   // SWAP
   glutSwapBuffers();
   }
   

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6. Javier Gonzalez-Sanchez | SER332 | Spring 2018 | 6
   jgs
   Homework
   Review the full example at
   https://github.com/javiergs/SER332/blob/master/Lecture24/main.cpp
   

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7. jgs
   SER332 Introduction to Graphics
   Javier Gonzalez-Sanchez
   javiergs@asu.edu
   Spring 2018
   Disclaimer. These slides can only be used as study material for the class SER332 at ASU. They cannot be distributed or used for another purpose.
   

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