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60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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The triangle only becomes gray because ambient light is halved:
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http://forum.unity3d.com/threads/why-is-ambient-light-at-half-strength.33955/
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*/
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#include <stdlib.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <GL/glut.h>
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static void init(void) {
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GLfloat light0_ambient[] = {1.0, 1.0, 1.0, 1.0};
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GLfloat light0_position[] = {0.0, -1.0, 0.0, 0.0};
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glShadeModel(GL_SMOOTH);
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glEnable(GL_LIGHTING);
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glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
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glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient);
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glColorMaterial(GL_FRONT, GL_AMBIENT);
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glEnable(GL_COLOR_MATERIAL);
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}
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static void draw_triangle() {
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glColor3f(1.0, 0.0, 0.0);
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glVertex3f(0.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f, -1.0f, 0.0f);
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glVertex3f(1.0f, -1.0f, 0.0f);
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}
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static void display(void) {
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glClear(GL_COLOR_BUFFER_BIT);
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glLoadIdentity();
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glBegin(GL_TRIANGLES);
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draw_triangle();
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glEnd();
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glFlush();
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}
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static void reshape(int w, int h) {
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-2.0, 2.0, -2.0, 2.0, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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}
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int main(int argc, char** argv) {
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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glutInitWindowSize(500, 500);
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glutInitWindowPosition(100, 100);
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glutCreateWindow(argv[0]);
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init();
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glutDisplayFunc(display);
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glutReshapeFunc(reshape);
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glutMainLoop();
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return EXIT_SUCCESS;
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}
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