diff options
| -rw-r--r-- | progs/trivial/Makefile | 1 | ||||
| -rw-r--r-- | progs/trivial/line-smooth.c | 172 |
2 files changed, 173 insertions, 0 deletions
diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile index d19abe7e86..8bc6ad4e38 100644 --- a/progs/trivial/Makefile +++ b/progs/trivial/Makefile @@ -25,6 +25,7 @@ SOURCES = \ fs-tri.c \ line-clip.c \ line-cull.c \ + line-smooth.c \ line-stipple-wide.c \ line-userclip-clip.c \ line-userclip-nop-clip.c \ diff --git a/progs/trivial/line-smooth.c b/progs/trivial/line-smooth.c new file mode 100644 index 0000000000..f030de9b9f --- /dev/null +++ b/progs/trivial/line-smooth.c @@ -0,0 +1,172 @@ +/* + * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software and + * its documentation for any purpose is hereby granted without fee, provided + * that (i) the above copyright notices and this permission notice appear in + * all copies of the software and related documentation, and (ii) the name of + * Silicon Graphics may not be used in any advertising or + * publicity relating to the software without the specific, prior written + * permission of Silicon Graphics. + * + * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF + * ANY KIND, + * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY + * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. + * + * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR + * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, + * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, + * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF + * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ + +#include <math.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <GL/glut.h> + + +#define CI_OFFSET_1 16 +#define CI_OFFSET_2 32 + + +GLenum doubleBuffer; +GLboolean smooth = GL_TRUE; +GLfloat width = 1.0; + + +static void Init(void) +{ + float range[2], aarange[2]; + fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); + fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); + glGetFloatv(GL_LINE_WIDTH_RANGE, aarange); + glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, range); + printf("Non-AA line width range: %f .. %f\n", range[0], range[1]); + printf("AA line width range: %f .. %f\n", aarange[0], aarange[1]); +} + + +static void Reshape(int width, int height) +{ + glViewport(0, 0, (GLint)width, (GLint)height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0, 0, -30); +} + +static void Key(unsigned char key, int x, int y) +{ + switch (key) { + case 'w': + width -= 0.5; + if (width < 0.5) + width = 0.5; + break; + case 'W': + width += 0.5; + break; + case 's': + smooth = !smooth; + break; + case 27: + exit(1); + default: + return; + } + printf("LineWidth: %g\n", width); + glutPostRedisplay(); +} + + +static void Draw(void) +{ + float a; + + glClear(GL_COLOR_BUFFER_BIT); + + glLineWidth(width); + + if (smooth) { + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable(GL_BLEND); + glEnable(GL_LINE_SMOOTH); + } + + glColor3f(1, 1, 1); + + glBegin(GL_LINES); + for (a = 0; a < 3.14159; a += 0.2) { + float x = .9 * cos(a); + float y = .9 * sin(a); + + glVertex2f(-x, -y); + glVertex2f( x, y); + } + glEnd(); + + glDisable(GL_LINE_SMOOTH); + glDisable(GL_BLEND); + + glFlush(); + + if (doubleBuffer) { + glutSwapBuffers(); + } +} + +static GLenum Args(int argc, char **argv) +{ + GLint i; + + doubleBuffer = GL_FALSE; + + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "-sb") == 0) { + doubleBuffer = GL_FALSE; + } else if (strcmp(argv[i], "-db") == 0) { + doubleBuffer = GL_TRUE; + } else { + fprintf(stderr, "%s (Bad option).\n", argv[i]); + return GL_FALSE; + } + } + return GL_TRUE; +} + + +int main(int argc, char **argv) +{ + GLenum type; + + glutInit(&argc, argv); + + if (Args(argc, argv) == GL_FALSE) { + exit(1); + } + + glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250); + + type = GLUT_RGB; + type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; + glutInitDisplayMode(type); + + if (glutCreateWindow(argv[0]) == GL_FALSE) { + exit(1); + } + + Init(); + + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Draw); + glutMainLoop(); + return 0; +} |