+++ /dev/null
-/*
- * Use glCopyTexSubImage2D to draw animated gears on the sides of a box.
- *
- * Brian Paul
- * 27 January 2006
- */
-
-#include <math.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <GL/glut.h>
-
-#ifndef M_PI
-#define M_PI 3.14159265
-#endif
-
-static GLint WinWidth = 800, WinHeight = 500;
-static GLint TexWidth, TexHeight;
-static GLuint TexObj = 1;
-static GLenum IntFormat = GL_RGB;
-
-static GLboolean WireFrame = GL_FALSE;
-
-static GLint T0 = 0;
-static GLint Frames = 0;
-static GLint Win = 0;
-
-static GLfloat ViewRotX = 20.0, ViewRotY = 30.0, ViewRotZ = 0.0;
-static GLint Gear1, Gear2, Gear3;
-static GLfloat GearRot = 0.0;
-static GLfloat CubeRot = 0.0;
-
-
-/**
- Draw a gear wheel. You'll probably want to call this function when
- building a display list since we do a lot of trig here.
-
- Input: inner_radius - radius of hole at center
- outer_radius - radius at center of teeth
- width - width of gear
- teeth - number of teeth
- tooth_depth - depth of tooth
- **/
-static void
-gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
- GLint teeth, GLfloat tooth_depth)
-{
- GLint i;
- GLfloat r0, r1, r2;
- GLfloat angle, da;
- GLfloat u, v, len;
-
- r0 = inner_radius;
- r1 = outer_radius - tooth_depth / 2.0;
- r2 = outer_radius + tooth_depth / 2.0;
-
- da = 2.0 * M_PI / teeth / 4.0;
-
- glShadeModel(GL_FLAT);
-
- glNormal3f(0.0, 0.0, 1.0);
-
- /* draw front face */
- glBegin(GL_QUAD_STRIP);
- for (i = 0; i <= teeth; i++) {
- angle = i * 2.0 * M_PI / teeth;
- glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
- glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
- if (i < teeth) {
- glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
- glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
- }
- }
- glEnd();
-
- /* draw front sides of teeth */
- glBegin(GL_QUADS);
- da = 2.0 * M_PI / teeth / 4.0;
- for (i = 0; i < teeth; i++) {
- angle = i * 2.0 * M_PI / teeth;
-
- glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
- glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
- glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
- glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
- }
- glEnd();
-
- glNormal3f(0.0, 0.0, -1.0);
-
- /* draw back face */
- glBegin(GL_QUAD_STRIP);
- for (i = 0; i <= teeth; i++) {
- angle = i * 2.0 * M_PI / teeth;
- glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
- glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
- if (i < teeth) {
- glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
- glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
- }
- }
- glEnd();
-
- /* draw back sides of teeth */
- glBegin(GL_QUADS);
- da = 2.0 * M_PI / teeth / 4.0;
- for (i = 0; i < teeth; i++) {
- angle = i * 2.0 * M_PI / teeth;
-
- glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
- glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
- glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
- glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
- }
- glEnd();
-
- /* draw outward faces of teeth */
- glBegin(GL_QUAD_STRIP);
- for (i = 0; i < teeth; i++) {
- angle = i * 2.0 * M_PI / teeth;
-
- glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
- glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
- u = r2 * cos(angle + da) - r1 * cos(angle);
- v = r2 * sin(angle + da) - r1 * sin(angle);
- len = sqrt(u * u + v * v);
- u /= len;
- v /= len;
- glNormal3f(v, -u, 0.0);
- glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
- glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
- glNormal3f(cos(angle), sin(angle), 0.0);
- glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
- glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
- u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
- v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
- glNormal3f(v, -u, 0.0);
- glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
- glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
- glNormal3f(cos(angle), sin(angle), 0.0);
- }
-
- glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
- glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
-
- glEnd();
-
- glShadeModel(GL_SMOOTH);
-
- /* draw inside radius cylinder */
- glBegin(GL_QUAD_STRIP);
- for (i = 0; i <= teeth; i++) {
- angle = i * 2.0 * M_PI / teeth;
- glNormal3f(-cos(angle), -sin(angle), 0.0);
- glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
- glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
- }
- glEnd();
-
-}
-
-static void
-cleanup(void)
-{
- glDeleteTextures(1, &TexObj);
- glDeleteLists(Gear1, 1);
- glDeleteLists(Gear2, 1);
- glDeleteLists(Gear3, 1);
- glutDestroyWindow(Win);
-}
-
-
-static void
-DrawGears(void)
-{
- if (WireFrame) {
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- }
-
- glPushMatrix();
- glRotatef(20/*ViewRotX*/, 1.0, 0.0, 0.0);
- glRotatef(ViewRotY, 0.0, 1.0, 0.0);
- glRotatef(ViewRotZ, 0.0, 0.0, 1.0);
-
- glPushMatrix();
- glTranslatef(-3.0, -2.0, 0.0);
- glRotatef(GearRot, 0.0, 0.0, 1.0);
- glCallList(Gear1);
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef(3.1, -2.0, 0.0);
- glRotatef(-2.0 * GearRot - 9.0, 0.0, 0.0, 1.0);
- glCallList(Gear2);
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef(-3.1, 4.2, 0.0);
- glRotatef(-2.0 * GearRot - 25.0, 0.0, 0.0, 1.0);
- glCallList(Gear3);
- glPopMatrix();
-
- glPopMatrix();
-
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-}
-
-
-static void
-DrawCube(void)
-{
- static const GLfloat texcoords[4][2] = {
- { 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 }
- };
- static const GLfloat vertices[4][2] = {
- { -1, -1 }, { 1, -1 }, { 1, 1 }, { -1, 1 }
- };
- static const GLfloat xforms[6][4] = {
- { 0, 0, 1, 0 },
- { 90, 0, 1, 0 },
- { 180, 0, 1, 0 },
- { 270, 0, 1, 0 },
- { 90, 1, 0, 0 },
- { -90, 1, 0, 0 }
- };
- static const GLfloat mat[4] = { 1.0, 1.0, 0.5, 1.0 };
- GLint i, j;
-
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat);
- glEnable(GL_TEXTURE_2D);
-
- glPushMatrix();
- glRotatef(ViewRotX, 1.0, 0.0, 0.0);
- glRotatef(15, 1, 0, 0);
- glRotatef(CubeRot, 0, 1, 0);
- glScalef(4, 4, 4);
-
- for (i = 0; i < 6; i++) {
- glPushMatrix();
- glRotatef(xforms[i][0], xforms[i][1], xforms[i][2], xforms[i][3]);
- glTranslatef(0, 0, 1.1);
- glBegin(GL_POLYGON);
- glNormal3f(0, 0, 1);
- for (j = 0; j < 4; j++) {
- glTexCoord2fv(texcoords[j]);
- glVertex2fv(vertices[j]);
- }
- glEnd();
- glPopMatrix();
- }
- glPopMatrix();
-
- glDisable(GL_TEXTURE_2D);
-}
-
-
-static void
-draw(void)
-{
- float ar;
-
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.0, 0.0, -40.0);
-
- /* clear whole depth buffer */
- glDisable(GL_SCISSOR_TEST);
- glClear(GL_DEPTH_BUFFER_BIT);
- glEnable(GL_SCISSOR_TEST);
-
- /* clear upper-left corner of color buffer (unused space) */
- glScissor(0, TexHeight, TexWidth, WinHeight - TexHeight);
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- /* clear lower-left corner of color buffer */
- glViewport(0, 0, TexWidth, TexHeight);
- glScissor(0, 0, TexWidth, TexHeight);
- glClearColor(1, 1, 1, 0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- /* draw gears in lower-left corner */
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 60.0);
- glMatrixMode(GL_MODELVIEW);
- DrawGears();
-
- /* copy color buffer to texture */
- glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, TexWidth, TexHeight);
-
- /* clear right half of color buffer */
- glViewport(TexWidth, 0, WinWidth - TexWidth, WinHeight);
- glScissor(TexWidth, 0, WinWidth - TexWidth, WinHeight);
- glClearColor(0.5, 0.5, 0.8, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- /* draw textured cube in right half of window */
- ar = (float) (WinWidth - TexWidth) / WinHeight;
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum(-ar, ar, -1.0, 1.0, 5.0, 60.0);
- glMatrixMode(GL_MODELVIEW);
- DrawCube();
-
- /* finish up */
- glutSwapBuffers();
-
- Frames++;
- {
- GLint t = glutGet(GLUT_ELAPSED_TIME);
- if (t - T0 >= 5000) {
- GLfloat seconds = (t - T0) / 1000.0;
- GLfloat fps = Frames / seconds;
- printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
- fflush(stdout);
- T0 = t;
- Frames = 0;
- }
- }
-}
-
-
-static void
-idle(void)
-{
- static double t0 = -1.;
- double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
- if (t0 < 0.0)
- t0 = t;
- dt = t - t0;
- t0 = t;
-
- /* fmod to prevent overflow */
- GearRot = fmod(GearRot + 70.0 * dt, 360.0); /* 70 deg/sec */
- CubeRot = fmod(CubeRot + 15.0 * dt, 360.0); /* 15 deg/sec */
-
- glutPostRedisplay();
-}
-
-
-/* change view angle, exit upon ESC */
-static void
-key(unsigned char k, int x, int y)
-{
- (void) x;
- (void) y;
- switch (k) {
- case 'w':
- WireFrame = !WireFrame;
- break;
- case 'z':
- ViewRotZ += 5.0;
- break;
- case 'Z':
- ViewRotZ -= 5.0;
- break;
- case 27: /* Escape */
- cleanup();
- exit(0);
- break;
- default:
- return;
- }
- glutPostRedisplay();
-}
-
-/* change view angle */
-static void
-special(int k, int x, int y)
-{
- (void) x;
- (void) y;
- switch (k) {
- case GLUT_KEY_UP:
- ViewRotX += 5.0;
- break;
- case GLUT_KEY_DOWN:
- ViewRotX -= 5.0;
- break;
- case GLUT_KEY_LEFT:
- ViewRotY += 5.0;
- break;
- case GLUT_KEY_RIGHT:
- ViewRotY -= 5.0;
- break;
- default:
- return;
- }
- glutPostRedisplay();
-}
-
-
-/* new window size or exposure */
-static void
-reshape(int width, int height)
-{
- WinWidth = width;
- WinHeight = height;
-}
-
-
-static void
-init(int argc, char *argv[])
-{
- static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0};
- static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0};
- static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0};
- static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0};
- GLint i;
-
- glLightfv(GL_LIGHT0, GL_POSITION, pos);
-#if 0
- glEnable(GL_CULL_FACE);
-#endif
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glEnable(GL_DEPTH_TEST);
-
- /* make the gears */
- Gear1 = glGenLists(1);
- glNewList(Gear1, GL_COMPILE);
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
- gear(1.0, 4.0, 1.0, 20, 0.7);
- glEndList();
-
- Gear2 = glGenLists(1);
- glNewList(Gear2, GL_COMPILE);
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
- gear(0.5, 2.0, 2.0, 10, 0.7);
- glEndList();
-
- Gear3 = glGenLists(1);
- glNewList(Gear3, GL_COMPILE);
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
- gear(1.3, 2.0, 0.5, 10, 0.7);
- glEndList();
-
- glEnable(GL_NORMALIZE);
-
- /* xxx make size dynamic */
- TexWidth = 256;
- TexHeight = 256;
-
- glBindTexture(GL_TEXTURE_2D, TexObj);
- glTexImage2D(GL_TEXTURE_2D, 0, IntFormat, TexWidth, TexHeight, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-
- for ( i=1; i<argc; i++ ) {
- if (strcmp(argv[i], "-info")==0) {
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
- printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
- printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
- printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
- }
- }
-}
-
-
-static void
-visible(int vis)
-{
- if (vis == GLUT_VISIBLE)
- glutIdleFunc(idle);
- else
- glutIdleFunc(NULL);
-}
-
-
-int
-main(int argc, char *argv[])
-{
- glutInitWindowSize(WinWidth, WinHeight);
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
-
- Win = glutCreateWindow("gearbox");
- init(argc, argv);
-
- glutDisplayFunc(draw);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(key);
- glutSpecialFunc(special);
- glutVisibilityFunc(visible);
-
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
-}
projects / mesa.git / blobdiff