| Brian | f726ffd | 2007-08-30 14:43:59 -0600 | [diff] [blame] | 1 | /** |
| 2 | * Test flat shading and clipping. |
| 3 | * |
| 4 | * Brian Paul |
| 5 | * 30 August 2007 |
| 6 | */ |
| 7 | |
| 8 | |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <math.h> |
| 12 | #include <GL/glut.h> |
| 13 | |
| 14 | static int Win; |
| 15 | static GLfloat Scale = 2.0, Zrot = 50; |
| 16 | static GLenum Mode = GL_LINE_LOOP; |
| 17 | static GLboolean Smooth = 0; |
| 18 | static GLenum PolygonMode = GL_FILL; |
| 19 | |
| 20 | |
| 21 | static void |
| 22 | Draw(void) |
| 23 | { |
| 24 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 25 | |
| 26 | if (Smooth) |
| 27 | glShadeModel(GL_SMOOTH); |
| 28 | else |
| 29 | glShadeModel(GL_FLAT); |
| 30 | |
| 31 | glPushMatrix(); |
| 32 | glScalef(Scale, Scale, 1); |
| 33 | glRotatef(Zrot, 0, 0, 1); |
| 34 | |
| 35 | glPolygonMode(GL_FRONT_AND_BACK, PolygonMode); |
| 36 | |
| 37 | glBegin(Mode); |
| 38 | glColor3f(1, 0, 0); |
| 39 | glVertex2f(-1, -1); |
| 40 | glColor3f(0, 1, 0); |
| 41 | glVertex2f( 2, -1); |
| 42 | glColor3f(0, 0, 1); |
| 43 | glVertex2f( 0, 1); |
| 44 | glEnd(); |
| 45 | |
| 46 | glPushMatrix(); |
| 47 | glScalef(0.9, 0.9, 1); |
| 48 | glBegin(Mode); |
| 49 | glColor3f(1, 0, 0); |
| 50 | glVertex2f( 0, 1); |
| 51 | |
| 52 | glColor3f(0, 0, 1); |
| 53 | glVertex2f( 2, -1); |
| 54 | |
| 55 | glColor3f(0, 1, 0); |
| 56 | glVertex2f(-1, -1); |
| 57 | |
| 58 | glEnd(); |
| 59 | glPopMatrix(); |
| 60 | |
| 61 | glPopMatrix(); |
| 62 | |
| 63 | glutSwapBuffers(); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | static void |
| 68 | Reshape(int width, int height) |
| 69 | { |
| 70 | glViewport(0, 0, width, height); |
| 71 | glMatrixMode(GL_PROJECTION); |
| 72 | glLoadIdentity(); |
| 73 | glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0); |
| 74 | glMatrixMode(GL_MODELVIEW); |
| 75 | glLoadIdentity(); |
| 76 | glTranslatef(0.0, 0.0, -15.0); |
| 77 | } |
| 78 | |
| 79 | |
| 80 | static void |
| 81 | Key(unsigned char key, int x, int y) |
| 82 | { |
| 83 | (void) x; |
| 84 | (void) y; |
| 85 | switch (key) { |
| 86 | case 'p': |
| 87 | if (Mode == GL_TRIANGLES) |
| 88 | Mode = GL_LINE_LOOP; |
| 89 | else |
| 90 | Mode = GL_TRIANGLES; |
| 91 | break; |
| 92 | case 'f': |
| 93 | if (PolygonMode == GL_POINT) |
| 94 | PolygonMode = GL_LINE; |
| 95 | else if (PolygonMode == GL_LINE) |
| 96 | PolygonMode = GL_FILL; |
| 97 | else |
| 98 | PolygonMode = GL_POINT; |
| 99 | printf("PolygonMode = 0x%x\n", PolygonMode); |
| 100 | break; |
| 101 | case 'r': |
| 102 | Zrot -= 5.0; |
| 103 | break; |
| 104 | case 'R': |
| 105 | Zrot += 5.0; |
| 106 | break; |
| 107 | case 'z': |
| 108 | Scale *= 1.1; |
| 109 | break; |
| 110 | case 'Z': |
| 111 | Scale /= 1.1; |
| 112 | break; |
| 113 | case 's': |
| 114 | Smooth = !Smooth; |
| 115 | break; |
| 116 | case 27: |
| 117 | glutDestroyWindow(Win); |
| 118 | exit(0); |
| 119 | break; |
| 120 | } |
| 121 | glutPostRedisplay(); |
| 122 | } |
| 123 | |
| 124 | |
| 125 | static void |
| 126 | Init(void) |
| 127 | { |
| 128 | printf("Usage:\n"); |
| 129 | printf(" z/Z: change triangle size\n"); |
| 130 | printf(" r/R: rotate\n"); |
| 131 | printf(" p: toggle line/fill mode\n"); |
| Brian | 0508370 | 2007-08-30 14:44:40 -0600 | [diff] [blame] | 132 | printf(" s: toggle smooth/flat shading\n"); |
| 133 | printf(" f: switch polygon fill mode\n"); |
| Brian | f726ffd | 2007-08-30 14:43:59 -0600 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | |
| 137 | int |
| 138 | main(int argc, char *argv[]) |
| 139 | { |
| 140 | glutInit(&argc, argv); |
| 141 | glutInitWindowPosition(0, 0); |
| 142 | glutInitWindowSize(400, 400); |
| 143 | glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); |
| 144 | Win = glutCreateWindow(argv[0]); |
| 145 | glutReshapeFunc(Reshape); |
| 146 | glutKeyboardFunc(Key); |
| 147 | glutDisplayFunc(Draw); |
| 148 | Init(); |
| 149 | glutMainLoop(); |
| 150 | return 0; |
| 151 | } |