1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/teapot.c	Sun Oct 27 06:31:18 2013 +0200
     1.3 @@ -0,0 +1,87 @@
     1.4 +#ifndef __APPLE__
     1.5 +#include <GL/gl.h>
     1.6 +#else
     1.7 +#include <OpenGL/gl.h>
     1.8 +#endif
     1.9 +
    1.10 +#include "teapot.h"
    1.11 +#include "teapot_data.h"
    1.12 +
    1.13 +static void draw_patch(struct vec3 *bez_cp, int *index, int flip, int useg, int vseg, float scale);
    1.14 +
    1.15 +int patch_subdivision = 6;
    1.16 +
    1.17 +void bezier_teapot(float scale)
    1.18 +{
    1.19 +	int i;
    1.20 +
    1.21 +	scale /= 2.0;
    1.22 +
    1.23 +	for(i=0; i<NUM_TEAPOT_PATCHES; i++) {
    1.24 +		float flip = teapot_part_flip[i];
    1.25 +		float rot = teapot_part_rot[i];
    1.26 +
    1.27 +		glMatrixMode(GL_MODELVIEW);
    1.28 +		glPushMatrix();
    1.29 +		glTranslatef(0, -3.15 * scale * 0.5, 0);
    1.30 +		glRotatef(rot, 0, 1, 0);
    1.31 +		glScalef(1, 1, flip);
    1.32 +		glRotatef(-90, 1, 0, 0);
    1.33 +
    1.34 +		draw_patch(teapot_verts, teapot_index + i * 16, flip < 0.0 ? 1 : 0, patch_subdivision, patch_subdivision, scale);
    1.35 +
    1.36 +		glPopMatrix();
    1.37 +	}
    1.38 +}
    1.39 +
    1.40 +static void draw_patch(struct vec3 *bez_cp, int *index, int flip, int useg, int vseg, float scale)
    1.41 +{
    1.42 +	static const float uoffs[2][4] = {{0, 0, 1, 1}, {1, 1, 0, 0}};
    1.43 +	static const float voffs[4] = {0, 1, 1, 0};
    1.44 +
    1.45 +	int i, j, k;
    1.46 +	struct vec3 cp[16];
    1.47 +	struct vec3 pt, n;
    1.48 +	float u, v;
    1.49 +	float du = 1.0 / useg;
    1.50 +	float dv = 1.0 / vseg;
    1.51 +
    1.52 +	/* collect control points */
    1.53 +	for(i=0; i<16; i++) {
    1.54 +		cp[i] = bez_cp[index[i]];
    1.55 +	}
    1.56 +
    1.57 +	glBegin(GL_QUADS);
    1.58 +	glColor3f(1, 1, 1);
    1.59 +
    1.60 +	u = 0;
    1.61 +	for(i=0; i<useg; i++) {
    1.62 +		v = 0;
    1.63 +		for(j=0; j<vseg; j++) {
    1.64 +
    1.65 +			for(k=0; k<4; k++) {
    1.66 +				pt = bezier_patch(cp, u + uoffs[flip][k] * du, v + voffs[k] * dv);
    1.67 +
    1.68 +				/* top/bottom normal hack */
    1.69 +				if(pt.z > 3.14) {
    1.70 +					n.x = n.y = 0.0f;
    1.71 +					n.z = 1.0f;
    1.72 +				} else if(pt.z < 0.00001) {
    1.73 +					n.x = n.y = 0.0f;
    1.74 +					n.z = -1.0f;
    1.75 +				} else {
    1.76 +					n = bezier_patch_norm(cp, u + uoffs[flip][k] * du, v + voffs[k] * dv);
    1.77 +				}
    1.78 +
    1.79 +				glTexCoord2f(u, v);
    1.80 +				glNormal3f(n.x, n.y, n.z);
    1.81 +				glVertex3f(pt.x * scale, pt.y * scale, pt.z * scale);
    1.82 +			}
    1.83 +
    1.84 +			v += dv;
    1.85 +		}
    1.86 +		u += du;
    1.87 +	}
    1.88 +
    1.89 +	glEnd();
    1.90 +}