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Add gears recipe
This commit is contained in:
Jeremy Soller
parent
1daf9f1d3d
commit
af13aa8509
343
recipes/gears/gears.c
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343
recipes/gears/gears.c
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/* gears.c */
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/*
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* 3-D gear wheels. This program is in the public domain.
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*
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* Brian Paul
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*/
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/* Conversion to GLUT by Mark J. Kilgard */
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#include <math.h>
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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/osmesa.h>
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#include <orbital.h>
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#ifndef M_PI
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#define M_PI 3.14159265
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#endif
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/**
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Draw a gear wheel. You'll probably want to call this function when
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building a display list since we do a lot of trig here.
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Input: inner_radius - radius of hole at center
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outer_radius - radius at center of teeth
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width - width of gear
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teeth - number of teeth
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tooth_depth - depth of tooth
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**/
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static void
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gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
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GLint teeth, GLfloat tooth_depth)
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{
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GLint i;
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GLfloat r0, r1, r2;
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GLfloat angle, da;
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GLfloat u, v, len;
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r0 = inner_radius;
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r1 = outer_radius - tooth_depth / 2.0;
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r2 = outer_radius + tooth_depth / 2.0;
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da = 2.0 * M_PI / teeth / 4.0;
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glShadeModel(GL_FLAT);
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glNormal3f(0.0, 0.0, 1.0);
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/* draw front face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
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}
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glEnd();
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/* draw front sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * M_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
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}
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glEnd();
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glNormal3f(0.0, 0.0, -1.0);
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/* draw back face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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}
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glEnd();
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/* draw back sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * M_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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}
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glEnd();
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/* draw outward faces of teeth */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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u = r2 * cos(angle + da) - r1 * cos(angle);
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v = r2 * sin(angle + da) - r1 * sin(angle);
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len = sqrt(u * u + v * v);
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u /= len;
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v /= len;
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glNormal3f(v, -u, 0.0);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
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u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
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v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
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glNormal3f(v, -u, 0.0);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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}
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glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
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glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
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glEnd();
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glShadeModel(GL_SMOOTH);
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/* draw inside radius cylinder */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glNormal3f(-cos(angle), -sin(angle), 0.0);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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}
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glEnd();
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}
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static int width = 800;
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static int height = 600;
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static void * buffer = NULL;
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static void * window = NULL;
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static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
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static GLint gear1, gear2, gear3;
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static GLfloat angle = 0.0;
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static GLuint limit;
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static GLuint count = 1;
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static void
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sync(void)
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{
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glFinish();
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uint32_t * frame_data = orb_window_data(window);
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uint32_t * image_data = (uint32_t *)buffer;
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int i;
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for(i = 0; i < width * height; i++) {
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frame_data[i] = image_data[i] | 0xFF000000;
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}
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orb_window_sync(window);
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}
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static void
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draw(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix();
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glRotatef(view_rotx, 1.0, 0.0, 0.0);
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glRotatef(view_roty, 0.0, 1.0, 0.0);
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glRotatef(view_rotz, 0.0, 0.0, 1.0);
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glPushMatrix();
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glTranslatef(-3.0, -2.0, 0.0);
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glRotatef(angle, 0.0, 0.0, 1.0);
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glCallList(gear1);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(3.1, -2.0, 0.0);
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glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
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glCallList(gear2);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(-3.1, 4.2, 0.0);
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glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
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glCallList(gear3);
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glPopMatrix();
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glPopMatrix();
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sync();
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count++;
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if (count == limit) {
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exit(0);
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}
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}
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static void
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idle(void)
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{
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angle += 2.0;
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draw();
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}
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/* new window size or exposure */
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static void
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reshape(int width, int height)
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{
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GLfloat h = (GLfloat) height / (GLfloat) width;
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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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glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -40.0);
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}
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static void
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init(void)
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{
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static GLfloat pos[4] =
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{5.0, 5.0, 10.0, 0.0};
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static GLfloat red[4] =
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{0.8, 0.1, 0.0, 1.0};
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static GLfloat green[4] =
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{0.0, 0.8, 0.2, 1.0};
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static GLfloat blue[4] =
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{0.2, 0.2, 1.0, 1.0};
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glLightfv(GL_LIGHT0, GL_POSITION, pos);
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glEnable(GL_CULL_FACE);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glEnable(GL_DEPTH_TEST);
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/* make the gears */
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gear1 = glGenLists(1);
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glNewList(gear1, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
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gear(1.0, 4.0, 1.0, 20, 0.7);
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glEndList();
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gear2 = glGenLists(1);
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glNewList(gear2, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
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gear(0.5, 2.0, 2.0, 10, 0.7);
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glEndList();
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gear3 = glGenLists(1);
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glNewList(gear3, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
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gear(1.3, 2.0, 0.5, 10, 0.7);
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glEndList();
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glEnable(GL_NORMALIZE);
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}
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main(int argc, char *argv[])
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{
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if (argc > 1) {
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/* do 'n' frames then exit */
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limit = atoi(argv[1]) + 1;
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} else {
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limit = 0;
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}
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OSMesaContext ctx = OSMesaCreateContextExt(OSMESA_RGBA, 16, 0, 0, NULL);
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if (!ctx) {
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printf("OSMesaCreateContextExt failed\n");
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return 1;
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}
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buffer = malloc(width * height * 4);
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if(!buffer) {
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printf("malloc failed\n");
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OSMesaDestroyContext(ctx);
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return 1;
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}
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if (!OSMesaMakeCurrent(ctx, buffer, GL_UNSIGNED_BYTE, width, height)) {
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printf("OSMesaMakeCurrent failed\n");
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OSMesaDestroyContext(ctx);
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return 1;
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}
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OSMesaPixelStore(OSMESA_Y_UP, 0);
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OSMesaColorClamp(GL_TRUE);
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window = orb_window_new_flags(-1, -1, width, height, "Gears", ORB_WINDOW_ASYNC);
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init();
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reshape(width, height);
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char running = 1;
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while (running) {
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idle();
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void * event_iter = orb_window_events(window);
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OrbEventOption event_option;
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do {
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event_option = orb_events_next(event_iter);
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switch (event_option.tag) {
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case OrbEventOption_Quit:
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running = 0;
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break;
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default:
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break;
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}
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} while (running && event_option.tag != OrbEventOption_None);
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orb_events_destroy(event_iter);
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}
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orb_window_destroy(window);
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OSMesaDestroyContext(ctx);
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free(buffer);
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return 0; /* ANSI C requires main to return int. */
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}
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37
recipes/gears/recipe.sh
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37
recipes/gears/recipe.sh
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@ -0,0 +1,37 @@
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BUILD_DEPENDS=(liborbital mesa mesa_glu)
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function recipe_version {
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printf "1.0.0"
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skip=1
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}
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function recipe_update {
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echo "skipping update"
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skip=1
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}
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function recipe_build {
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cp ../gears.c gears.c
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sysroot="${PWD}/../sysroot"
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set -x
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"${CXX}" -I "$sysroot/include" -L "$sysroot/lib" gears.c -o gears -lorbital -lOSMesa -lGLU -lglapi -Wl,--whole-archive -lpthread -Wl,--no-whole-archive -lm
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set +x
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skip=1
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}
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function recipe_test {
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echo "skipping test"
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skip=1
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}
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function recipe_clean {
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make clean
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skip=1
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}
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function recipe_stage {
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dest="$(realpath $1)"
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mkdir -pv "$dest/bin"
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cp -v "gears" "$dest/bin/gears"
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skip=1
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}
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