quad.c

winNT技术操作系统,国外开放的原代码和LIUX一样

		}
		if (qobj->textureCoords) {
		    glTexCoord2f(1 - (float) i / slices,
			    (float) j / stacks);
		}
		glVertex3f(radiusLow * sinCache[i], radiusLow * cosCache[i],
			zLow);
	    }
	    glEnd();
	}
	for (i = 0; i < slices; i++) {
	    switch(qobj->normals) {
	      case GLU_FLAT:
	      case GLU_SMOOTH:
		glNormal3f(sinCache2[i], cosCache2[i], 0.0);
		break;
	      case GLU_NONE:
	      default:
		break;
	    }
	    sintemp = sinCache[i];
	    costemp = cosCache[i];
	    glBegin(GL_LINE_STRIP);
	    for (j = 0; j <= stacks; j++) {
		zLow = j * height / stacks;
		radiusLow = baseRadius - deltaRadius * ((float) j / stacks);

		if (qobj->textureCoords) {
		    glTexCoord2f(1 - (float) i / slices,
			    (float) j / stacks);
		}
		glVertex3f(radiusLow * sintemp,
			radiusLow * costemp, zLow);
	    }
	    glEnd();
	}
	break;
      default:
	break;
    }
}

void GLAPIENTRY
gluDisk(GLUquadric *qobj, GLdouble innerRadius, GLdouble outerRadius,
	    GLint slices, GLint loops)
{
    gluPartialDisk(qobj, innerRadius, outerRadius, slices, loops, 0.0, 360.0);
}

void GLAPIENTRY
gluPartialDisk(GLUquadric *qobj, GLdouble innerRadius,
		   GLdouble outerRadius, GLint slices, GLint loops,
		   GLdouble startAngle, GLdouble sweepAngle)
{
    GLint i,j;
    GLfloat sinCache[CACHE_SIZE];
    GLfloat cosCache[CACHE_SIZE];
    GLfloat angle;
    GLfloat sintemp, costemp;
    GLfloat deltaRadius;
    GLfloat radiusLow, radiusHigh;
    GLfloat texLow = 0, texHigh = 0;
    GLfloat angleOffset;
    GLint slices2;
    GLint finish;

    if (slices >= CACHE_SIZE) slices = CACHE_SIZE-1;
    if (slices < 2 || loops < 1 || outerRadius <= 0.0 || innerRadius < 0.0 ||
	    innerRadius > outerRadius) {
	gluQuadricError(qobj, GLU_INVALID_VALUE);
	return;
    }

    if (sweepAngle < -360.0) sweepAngle = 360.0;
    if (sweepAngle > 360.0) sweepAngle = 360.0;
    if (sweepAngle < 0) {
	startAngle += sweepAngle;
	sweepAngle = -sweepAngle;
    }

    if (sweepAngle == 360.0) {
	slices2 = slices;
    } else {
	slices2 = slices + 1;
    }

    /* Compute length (needed for normal calculations) */
    deltaRadius = outerRadius - innerRadius;

    /* Cache is the vertex locations cache */

    angleOffset = startAngle / 180.0 * PI;
    for (i = 0; i <= slices; i++) {
	angle = angleOffset + ((PI * sweepAngle) / 180.0) * i / slices;
	sinCache[i] = SIN(angle);
	cosCache[i] = COS(angle);
    }

    if (sweepAngle == 360.0) {
	sinCache[slices] = sinCache[0];
	cosCache[slices] = cosCache[0];
    }

    switch(qobj->normals) {
      case GLU_FLAT:
      case GLU_SMOOTH:
	if (qobj->orientation == GLU_OUTSIDE) {
	    glNormal3f(0.0, 0.0, 1.0);
	} else {
	    glNormal3f(0.0, 0.0, -1.0);
	}
	break;
      default:
      case GLU_NONE:
	break;
    }

    switch (qobj->drawStyle) {
      case GLU_FILL:
	if (innerRadius == 0.0) {
	    finish = loops - 1;
	    /* Triangle strip for inner polygons */
	    glBegin(GL_TRIANGLE_FAN);
	    if (qobj->textureCoords) {
		glTexCoord2f(0.5, 0.5);
	    }
	    glVertex3f(0.0, 0.0, 0.0);
	    radiusLow = outerRadius -
		    deltaRadius * ((float) (loops-1) / loops);
	    if (qobj->textureCoords) {
		texLow = radiusLow / outerRadius / 2;
	    }

	    if (qobj->orientation == GLU_OUTSIDE) {
		for (i = slices; i >= 0; i--) {
		    if (qobj->textureCoords) {
			glTexCoord2f(texLow * sinCache[i] + 0.5,
				texLow * cosCache[i] + 0.5);
		    }
		    glVertex3f(radiusLow * sinCache[i],
			    radiusLow * cosCache[i], 0.0);
		}
	    } else {
		for (i = 0; i <= slices; i++) {
		    if (qobj->textureCoords) {
			glTexCoord2f(texLow * sinCache[i] + 0.5,
				texLow * cosCache[i] + 0.5);
		    }
		    glVertex3f(radiusLow * sinCache[i],
			    radiusLow * cosCache[i], 0.0);
		}
	    }
	    glEnd();
	} else {
	    finish = loops;
	}
	for (j = 0; j < finish; j++) {
	    radiusLow = outerRadius - deltaRadius * ((float) j / loops);
	    radiusHigh = outerRadius - deltaRadius * ((float) (j + 1) / loops);
	    if (qobj->textureCoords) {
		texLow = radiusLow / outerRadius / 2;
		texHigh = radiusHigh / outerRadius / 2;
	    }

	    glBegin(GL_QUAD_STRIP);
	    for (i = 0; i <= slices; i++) {
		if (qobj->orientation == GLU_OUTSIDE) {
		    if (qobj->textureCoords) {
			glTexCoord2f(texLow * sinCache[i] + 0.5,
				texLow * cosCache[i] + 0.5);
		    }
		    glVertex3f(radiusLow * sinCache[i],
			    radiusLow * cosCache[i], 0.0);

		    if (qobj->textureCoords) {
			glTexCoord2f(texHigh * sinCache[i] + 0.5,
				texHigh * cosCache[i] + 0.5);
		    }
		    glVertex3f(radiusHigh * sinCache[i],
			    radiusHigh * cosCache[i], 0.0);
		} else {
		    if (qobj->textureCoords) {
			glTexCoord2f(texHigh * sinCache[i] + 0.5,
				texHigh * cosCache[i] + 0.5);
		    }
		    glVertex3f(radiusHigh * sinCache[i],
			    radiusHigh * cosCache[i], 0.0);

		    if (qobj->textureCoords) {
			glTexCoord2f(texLow * sinCache[i] + 0.5,
				texLow * cosCache[i] + 0.5);
		    }
		    glVertex3f(radiusLow * sinCache[i],
			    radiusLow * cosCache[i], 0.0);
		}
	    }
	    glEnd();
	}
	break;
      case GLU_POINT:
	glBegin(GL_POINTS);
	for (i = 0; i < slices2; i++) {
	    sintemp = sinCache[i];
	    costemp = cosCache[i];
	    for (j = 0; j <= loops; j++) {
		radiusLow = outerRadius - deltaRadius * ((float) j / loops);

		if (qobj->textureCoords) {
		    texLow = radiusLow / outerRadius / 2;

		    glTexCoord2f(texLow * sinCache[i] + 0.5,
			    texLow * cosCache[i] + 0.5);
		}
		glVertex3f(radiusLow * sintemp, radiusLow * costemp, 0.0);
	    }
	}
	glEnd();
	break;
      case GLU_LINE:
	if (innerRadius == outerRadius) {
	    glBegin(GL_LINE_STRIP);

	    for (i = 0; i <= slices; i++) {
		if (qobj->textureCoords) {
		    glTexCoord2f(sinCache[i] / 2 + 0.5,
			    cosCache[i] / 2 + 0.5);
		}
		glVertex3f(innerRadius * sinCache[i],
			innerRadius * cosCache[i], 0.0);
	    }
	    glEnd();
	    break;
	}
	for (j = 0; j <= loops; j++) {
	    radiusLow = outerRadius - deltaRadius * ((float) j / loops);
	    if (qobj->textureCoords) {
		texLow = radiusLow / outerRadius / 2;
	    }

	    glBegin(GL_LINE_STRIP);
	    for (i = 0; i <= slices; i++) {
		if (qobj->textureCoords) {
		    glTexCoord2f(texLow * sinCache[i] + 0.5,
			    texLow * cosCache[i] + 0.5);
		}
		glVertex3f(radiusLow * sinCache[i],
			radiusLow * cosCache[i], 0.0);
	    }
	    glEnd();
	}
	for (i=0; i < slices2; i++) {
	    sintemp = sinCache[i];
	    costemp = cosCache[i];
	    glBegin(GL_LINE_STRIP);
	    for (j = 0; j <= loops; j++) {
		radiusLow = outerRadius - deltaRadius * ((float) j / loops);
		if (qobj->textureCoords) {
		    texLow = radiusLow / outerRadius / 2;
		}

		if (qobj->textureCoords) {
		    glTexCoord2f(texLow * sinCache[i] + 0.5,
			    texLow * cosCache[i] + 0.5);
		}
		glVertex3f(radiusLow * sintemp, radiusLow * costemp, 0.0);
	    }
	    glEnd();
	}
	break;
      case GLU_SILHOUETTE:
	if (sweepAngle < 360.0) {
	    for (i = 0; i <= slices; i+= slices) {
		sintemp = sinCache[i];
		costemp = cosCache[i];
		glBegin(GL_LINE_STRIP);
		for (j = 0; j <= loops; j++) {
		    radiusLow = outerRadius - deltaRadius * ((float) j / loops);

		    if (qobj->textureCoords) {
			texLow = radiusLow / outerRadius / 2;
			glTexCoord2f(texLow * sinCache[i] + 0.5,
				texLow * cosCache[i] + 0.5);
		    }
		    glVertex3f(radiusLow * sintemp, radiusLow * costemp, 0.0);
		}
		glEnd();
	    }
	}
	for (j = 0; j <= loops; j += loops) {
	    radiusLow = outerRadius - deltaRadius * ((float) j / loops);
	    if (qobj->textureCoords) {
		texLow = radiusLow / outerRadius / 2;
	    }

	    glBegin(GL_LINE_STRIP);
	    for (i = 0; i <= slices; i++) {
		if (qobj->textureCoords) {
		    glTexCoord2f(texLow * sinCache[i] + 0.5,
			    texLow * cosCache[i] + 0.5);
		}
		glVertex3f(radiusLow * sinCache[i],
			radiusLow * cosCache[i], 0.0);
	    }
	    glEnd();
	    if (innerRadius == outerRadius) break;
	}
	break;
      default:
	break;
    }
}

void GLAPIENTRY
gluSphere(GLUquadric *qobj, GLdouble radius, GLint slices, GLint stacks)
{
    GLint i,j;
    GLfloat sinCache1a[CACHE_SIZE];
    GLfloat cosCache1a[CACHE_SIZE];
    GLfloat sinCache2a[CACHE_SIZE];
    GLfloat cosCache2a[CACHE_SIZE];
    GLfloat sinCache3a[CACHE_SIZE];
    GLfloat cosCache3a[CACHE_SIZE];
    GLfloat sinCache1b[CACHE_SIZE];
    GLfloat cosCache1b[CACHE_SIZE];
    GLfloat sinCache2b[CACHE_SIZE];
    GLfloat cosCache2b[CACHE_SIZE];
    GLfloat sinCache3b[CACHE_SIZE];
    GLfloat cosCache3b[CACHE_SIZE];
    GLfloat angle;
    GLfloat zLow, zHigh;
    GLfloat sintemp1, sintemp2=0, sintemp3=0, sintemp4=0;
    GLfloat costemp1, costemp2=0, costemp3=0, costemp4=0;
    GLboolean needCache2, needCache3;
    GLint start, finish;

    if (slices >= CACHE_SIZE) slices = CACHE_SIZE-1;
    if (stacks >= CACHE_SIZE) stacks = CACHE_SIZE-1;
    if (slices < 2 || stacks < 1 || radius < 0.0) {
	gluQuadricError(qobj, GLU_INVALID_VALUE);
	return;
    }

    /* Cache is the vertex locations cache */
    /* Cache2 is the various normals at the vertices themselves */
    /* Cache3 is the various normals for the faces */
    needCache2 = needCache3 = GL_FALSE;

    if (qobj->normals == GLU_SMOOTH) {
	needCache2 = GL_TRUE;
    }

    if (qobj->normals == GLU_FLAT) {
	if (qobj->drawStyle != GLU_POINT) {
	    needCache3 = GL_TRUE;
	}
	if (qobj->drawStyle == GLU_LINE) {
	    needCache2 = GL_TRUE;
	}
    }

    for (i = 0; i < slices; i++) {
	angle = 2 * PI * i / slices;
	sinCache1a[i] = SIN(angle);
	cosCache1a[i] = COS(angle);
	if (needCache2) {
	    sinCache2a[i] = sinCache1a[i];
	    cosCache2a[i] = cosCache1a[i];
	}
    }

    for (j = 0; j <= stacks; j++) {
	angle = PI * j / stacks;
	if (needCache2) {
	    if (qobj->orientation == GLU_OUTSIDE) {
		sinCache2b[j] = SIN(angle);
		cosCache2b[j] = COS(angle);
	    } else {
		sinCache2b[j] = -SIN(angle);
		cosCache2b[j] = -COS(angle);
	    }
	}
	sinCache1b[j] = radius * SIN(angle);
	cosCache1b[j] = radius * COS(angle);
    }
    /* Make sure it comes to a point */
    sinCache1b[0] = 0;
    sinCache1b[stacks] = 0;

    if (needCache3) {