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| 1 | #include <stdio.h> | |
| 2 | #include <stdlib.h> | |
| 3 | #include <string.h> | |
| 4 | - | #include <glut.h> |
| 4 | + | #include <GL/glut.h> |
| 5 | ||
| 6 | - | GLboolean doubleBuffer; |
| 6 | + | GLboolean doubleBuffer = GL_TRUE; |
| 7 | ||
| 8 | void draw_background() | |
| 9 | {
| |
| 10 | //big blue square | |
| 11 | glColor3ub(0,255,255); | |
| 12 | - | glBegin(GL_POLYGON); |
| 12 | + | glBegin(GL_QUADS); |
| 13 | glVertex3i(5, 5, 0); | |
| 14 | glVertex3i(-5, 5, 0); | |
| 15 | glVertex3i(-5, -5, 0); | |
| 16 | glVertex3i(5, -5, 0); | |
| 17 | glEnd(); | |
| 18 | } | |
| 19 | void draw_trangle() | |
| 20 | {
| |
| 21 | /* transparent triangle */ | |
| 22 | - | glColor4ub(255, 0, 0, 255); |
| 22 | + | glColor3ub(255, 0, 0); |
| 23 | - | glBegin(GL_POLYGON); |
| 23 | + | glBegin(GL_TRIANGLES); |
| 24 | glVertex3i(-4, -4, 0); | |
| 25 | glVertex3i(4, -4, 0); | |
| 26 | glVertex3i(0, 4, 0); | |
| 27 | glEnd(); | |
| 28 | } | |
| 29 | void draw_blue_square() | |
| 30 | {
| |
| 31 | /* blue square */ | |
| 32 | glColor3ub(0, 0, 200); | |
| 33 | - | glBegin(GL_POLYGON); |
| 33 | + | glBegin(GL_QUADS); |
| 34 | glVertex3i(3, 3, 0); | |
| 35 | glVertex3i(-3, 3, 0); | |
| 36 | glVertex3i(-3, -3, 0); | |
| 37 | glVertex3i(3, -3, 0); | |
| 38 | glEnd(); | |
| 39 | } | |
| 40 | ||
| 41 | /* ARGSUSED1 */ | |
| 42 | static void | |
| 43 | Key(unsigned char key, int x, int y) | |
| 44 | {
| |
| 45 | switch (key) {
| |
| 46 | case 27: | |
| 47 | exit(0); | |
| 48 | } | |
| 49 | } | |
| 50 | ||
| 51 | static void | |
| 52 | Draw(void) | |
| 53 | {
| |
| 54 | int win_width, win_height; | |
| 55 | win_width = glutGet(GLUT_WINDOW_WIDTH); | |
| 56 | win_height = glutGet(GLUT_WINDOW_HEIGHT); | |
| 57 | ||
| 58 | glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); | |
| 59 | ||
| 60 | glViewport(0, 0, win_width, win_height); | |
| 61 | ||
| 62 | glMatrixMode(GL_PROJECTION); | |
| 63 | glLoadIdentity(); | |
| 64 | glOrtho(-10, 10, -10, 10, -1, 1); | |
| 65 | ||
| 66 | glMatrixMode(GL_MODELVIEW); | |
| 67 | glLoadIdentity(); | |
| 68 | ||
| 69 | glDisable(GL_STENCIL_TEST); | |
| 70 | glStencilMask(0x0); | |
| 71 | ||
| 72 | draw_background(); | |
| 73 | ||
| 74 | glEnable(GL_STENCIL_TEST); | |
| 75 | glStencilMask(0x1); | |
| 76 | glStencilFunc(GL_ALWAYS, 0x1, 0x1); | |
| 77 | glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE); | |
| 78 | glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); | |
| 79 | glDepthMask(GL_FALSE); | |
| 80 | ||
| 81 | draw_trangle(); | |
| 82 | ||
| 83 | glStencilMask(0x1); | |
| 84 | glStencilFunc(GL_NOTEQUAL, 0x1, 0x1); | |
| 85 | glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); | |
| 86 | glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); | |
| 87 | glDepthMask(GL_TRUE); | |
| 88 | ||
| 89 | draw_blue_square(); | |
| 90 | ||
| 91 | if (doubleBuffer) {
| |
| 92 | glutSwapBuffers(); | |
| 93 | } else {
| |
| 94 | glFlush(); | |
| 95 | } | |
| 96 | } | |
| 97 | ||
| 98 | static void | |
| 99 | Args(int argc, char **argv) | |
| 100 | {
| |
| 101 | GLint i; | |
| 102 | ||
| 103 | doubleBuffer = GL_TRUE; | |
| 104 | for (i = 1; i < argc; i++) {
| |
| 105 | if (strcmp(argv[i], "-sb") == 0) {
| |
| 106 | doubleBuffer = GL_FALSE; | |
| 107 | } else if (strcmp(argv[i], "-db") == 0) {
| |
| 108 | doubleBuffer = GL_TRUE; | |
| 109 | } | |
| 110 | } | |
| 111 | } | |
| 112 | ||
| 113 | int | |
| 114 | main(int argc, char **argv) | |
| 115 | {
| |
| 116 | - | glClearStencil(0); |
| 116 | + | |
| 117 | - | glStencilMask(1); |
| 117 | + | |
| 118 | glutInit(&argc, argv); | |
| 119 | Args(argc, argv); | |
| 120 | ||
| 121 | type = GLUT_RGB | GLUT_STENCIL; | |
| 122 | - | glOrtho(-4, 4, -4, 4, -0.1, 0.1); |
| 122 | + | |
| 123 | glutInitDisplayMode(type); | |
| 124 | glutCreateWindow("Stencil Test");
| |
| 125 | ||
| 126 | glClearColor(0.0, 0.0, 0.0, 0.0); | |
| 127 | ||
| 128 | glutKeyboardFunc(Key); | |
| 129 | glutDisplayFunc(Draw); | |
| 130 | glutMainLoop(); | |
| 131 | return 0; | |
| 132 | } |
