progs/trivial: test glPolygonMode(POINT/LINE) with frustum clipping
Note whether the new verts introduced by clipping show up as points and lines along the edge of the window...
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@ -119,6 +119,7 @@ SOURCES = \
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tri-lit-material.c \
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tri-mask-tri.c \
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tri-orig.c \
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tri-point-line-clipped.c \
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tri-query.c \
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tri-repeat.c \
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tri-scissor-tri.c \
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@ -96,6 +96,7 @@ progs = [
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'tri-logicop-xor',
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'tri-mask-tri',
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'tri-orig',
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'tri-point-line-clipped',
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'tri-query',
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'tri-repeat',
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'tri-scissor-tri',
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@ -0,0 +1,91 @@
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/**
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* Test frustum clipping w/ glPolygonMode LINE/POINT.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <GL/glut.h>
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static int win;
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static void
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Tri(void)
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{
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glBegin(GL_TRIANGLES);
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glColor3f(1, 0, 0); glVertex3f(-1.5, -0.8, 0.0);
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glColor3f(0, 1, 0); glVertex3f( 1.5, -0.8, 0.0);
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glColor3f(0, 0, 1); glVertex3f( 0.0, 0.9, 0.0);
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glEnd();
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}
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static void
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Draw(void)
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{
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glPointSize(13.0);
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glLineWidth(5.0);
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glClear(GL_COLOR_BUFFER_BIT);
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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Tri();
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glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
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Tri();
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glutSwapBuffers();
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}
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static void Reshape(int width, int height)
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{
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glViewport(0, 0, (GLint)width, (GLint)height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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}
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static void
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Key(unsigned char key, int x, int y)
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{
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if (key == 27) {
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glutDestroyWindow(win);
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exit(0);
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}
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else {
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glutPostRedisplay();
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}
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}
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static void
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Init(void)
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{
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fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
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fflush(stderr);
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}
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int
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main(int argc, char **argv)
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{
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glutInitWindowSize(300, 300);
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
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win = glutCreateWindow(*argv);
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if (!win) {
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return 1;
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}
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Init();
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutDisplayFunc(Draw);
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glutMainLoop();
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return 0;
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}
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