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50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/*
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Draw an unfilled red triangle with lines only.
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https://www.opengl.org/sdk/docs/man/html/glPolygonMode.xhtml
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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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glClearColor(0.0, 0.0, 0.0, 0.0);
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glShadeModel(GL_FLAT);
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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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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glColor3f(1.0f, 0.0f, 0.0f);
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glVertex3f( 0.0f, 0.5f, 0.0f);
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glVertex3f(-0.5f, -0.5f, 0.0f);
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glVertex3f( 0.5f, -0.5f, 0.0f);
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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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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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