nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@1: #include <math.h>
nuclear@0: #include <GL/glew.h>
nuclear@0: #include <GL/glut.h>
nuclear@0: #include "sdr.h"
nuclear@1: #include "teapot_data.h"
nuclear@0: 
nuclear@0: void disp(void);
nuclear@1: void draw_teapot(void);
nuclear@1: void draw_teapot_patch(struct vec3 *bez_cp, int *index, int flip, float rot);
nuclear@0: void set_material(float dr, float dg, float db, float sr, float sg, float sb, float shin);
nuclear@0: void reshape(int x, int y);
nuclear@0: void keyb(unsigned char key, int x, int y);
nuclear@0: void mouse(int bn, int state, int x, int y);
nuclear@0: void motion(int x, int y);
nuclear@0: 
nuclear@0: static float cam_theta, cam_phi = 25;
nuclear@0: static float cam_dist = 8.0;
nuclear@0: 
nuclear@0: static unsigned int prog;
nuclear@0: 
nuclear@1: static int max_tess_level;
nuclear@1: static int tess_level = 5;
nuclear@1: 
nuclear@0: int main(int argc, char **argv)
nuclear@0: {
nuclear@0: 	glutInit(&argc, argv);
nuclear@0: 	glutInitWindowSize(1280, 800);
nuclear@0: 	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@0: 	glutCreateWindow("tesselation shaders test");
nuclear@0: 
nuclear@0: 	glutDisplayFunc(disp);
nuclear@0: 	glutReshapeFunc(reshape);
nuclear@0: 	glutKeyboardFunc(keyb);
nuclear@0: 	glutMouseFunc(mouse);
nuclear@0: 	glutMotionFunc(motion);
nuclear@0: 
nuclear@0: 	glewInit();
nuclear@0: 
nuclear@0: 	glClearColor(0.07, 0.07, 0.07, 1);
nuclear@0: 
nuclear@0: 	glEnable(GL_CULL_FACE);
nuclear@1: 	glEnable(GL_DEPTH_TEST);
nuclear@0: 
nuclear@0: 	if(!GLEW_ARB_tessellation_shader) {
nuclear@0: 		fprintf(stderr, "your OpenGL implementation does not support tesselation shaders\n");
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	glGetIntegerv(GL_MAX_TESS_GEN_LEVEL, &max_tess_level);
nuclear@0: 	printf("maximum tesselation levels: %d\n", max_tess_level);
nuclear@0: 
nuclear@0: 	glPatchParameteri(GL_PATCH_VERTICES, 16);
nuclear@0: 
nuclear@0: 	{
nuclear@0: 		unsigned int vsdr, tcsdr, tesdr, psdr;
nuclear@0: 
nuclear@0: 		if(!(vsdr = load_vertex_shader("sdr/bezier.v.glsl"))) {
nuclear@0: 			return 1;
nuclear@0: 		}
nuclear@0: 		if(!(tcsdr = load_tessctl_shader("sdr/bezier.tc.glsl"))) {
nuclear@0: 			return 1;
nuclear@0: 		}
nuclear@0: 		if(!(tesdr = load_tesseval_shader("sdr/bezier.te.glsl"))) {
nuclear@0: 			return 1;
nuclear@0: 		}
nuclear@0: 		if(!(psdr = load_pixel_shader("sdr/bezier.p.glsl"))) {
nuclear@0: 			return 1;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		if(!(prog = create_program_link(vsdr, tcsdr, tesdr, psdr, 0))) {
nuclear@0: 			return 1;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glutMainLoop();
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: void disp(void)
nuclear@0: {
nuclear@0: 	float lpos[] = {-5, 10, 4, 1};
nuclear@0: 
nuclear@0: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	glTranslatef(0, 0, -cam_dist);
nuclear@0: 	glRotatef(cam_phi, 1, 0, 0);
nuclear@0: 	glRotatef(cam_theta, 0, 1, 0);
nuclear@0: 
nuclear@0: 	glLightfv(GL_LIGHT0, GL_POSITION, lpos);
nuclear@0: 
nuclear@0: 	set_material(0.2, 0.35, 1.0, 1.0, 1.0, 1.0, 60.0);
nuclear@0: 
nuclear@1: 	draw_teapot();
nuclear@1: 
nuclear@1: 	glutSwapBuffers();
nuclear@1: }
nuclear@1: 
nuclear@1: void draw_teapot(void)
nuclear@1: {
nuclear@1: 	int i;
nuclear@1: 
nuclear@1: 	glPushMatrix();
nuclear@1: 	glRotatef(-90.0, 1, 0, 0);
nuclear@1: 
nuclear@0: 	glUseProgram(prog);
nuclear@1: 	set_uniform_int(prog, "tess_level", tess_level);
nuclear@1: 	set_uniform_float3(prog, "norm_scale", 1, 1, 1);
nuclear@0: 
nuclear@0: 	glBegin(GL_PATCHES);
nuclear@0: 
nuclear@1: 	/* first render the front-facing patches */
nuclear@1: 	for(i=0; i<NUM_TEAPOT_PATCHES; i++) {
nuclear@1: 		if(teapot_part_flip[i] > 0.0) {
nuclear@1: 			draw_teapot_patch(teapot_verts, teapot_index + i * 16, 0, teapot_part_rot[i]);
nuclear@1: 		}
nuclear@1: 	}
nuclear@1: 	glEnd();
nuclear@0: 
nuclear@1: 	set_uniform_float3(prog, "norm_scale", -1, -1, -1);
nuclear@0: 
nuclear@1: 	glFrontFace(GL_CW);
nuclear@1: 	glBegin(GL_PATCHES);
nuclear@1: 	/* then render the flipped ones */
nuclear@1: 	for(i=0; i<NUM_TEAPOT_PATCHES; i++) {
nuclear@1: 		if(teapot_part_flip[i] < 0.0) {
nuclear@1: 			draw_teapot_patch(teapot_verts, teapot_index + i * 16, 1, teapot_part_rot[i]);
nuclear@1: 		}
nuclear@1: 	}
nuclear@0: 	glEnd();
nuclear@1: 	glFrontFace(GL_CCW);
nuclear@0: 
nuclear@0: 	glUseProgram(0);
nuclear@0: 
nuclear@1: 	glPopMatrix();
nuclear@1: }
nuclear@1: 
nuclear@1: void draw_teapot_patch(struct vec3 *bez_cp, int *index, int flip, float rot)
nuclear@1: {
nuclear@1: 	int i;
nuclear@1: 	float cosr = cos(M_PI * rot / 180.0);
nuclear@1: 	float sinr = sin(M_PI * rot / 180.0);
nuclear@1: 
nuclear@1: 	for(i=0; i<16; i++) {
nuclear@1: 		struct vec3 cp = bez_cp[index[i]];
nuclear@1: 
nuclear@1: 		float x = cosr * cp.x + sinr * cp.y;
nuclear@1: 		float y = -sinr * cp.x + cosr * cp.y;
nuclear@1: 
nuclear@1: 		glVertex3f(x, flip ? -y : y, cp.z);
nuclear@1: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void set_material(float dr, float dg, float db, float sr, float sg, float sb, float shin)
nuclear@0: {
nuclear@0: 	float dcol[4], scol[4];
nuclear@0: 
nuclear@0: 	dcol[0] = dr;
nuclear@0: 	dcol[1] = dg;
nuclear@0: 	dcol[2] = db;
nuclear@0: 	dcol[3] = 1.0;
nuclear@0: 
nuclear@0: 	scol[0] = sr;
nuclear@0: 	scol[1] = sg;
nuclear@0: 	scol[2] = sb;
nuclear@0: 	scol[3] = 1.0;
nuclear@0: 
nuclear@0: 	glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, dcol);
nuclear@0: 	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, scol);
nuclear@0: 	glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shin);
nuclear@0: }
nuclear@0: 
nuclear@0: void reshape(int x, int y)
nuclear@0: {
nuclear@0: 	glViewport(0, 0, x, y);
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
nuclear@0: }
nuclear@0: 
nuclear@0: void keyb(unsigned char key, int x, int y)
nuclear@0: {
nuclear@0: 	switch(key) {
nuclear@0: 	case 27:
nuclear@0: 		exit(0);
nuclear@0: 
nuclear@0: 	case 'w':
nuclear@0: 		{
nuclear@0: 			static int wire;
nuclear@0: 			wire = !wire;
nuclear@0: 			if(wire) {
nuclear@0: 				glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
nuclear@0: 			} else {
nuclear@0: 				glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 		glutPostRedisplay();
nuclear@1: 
nuclear@1: 	case '=':
nuclear@1: 		if(tess_level < max_tess_level) {
nuclear@1: 			tess_level++;
nuclear@1: 			printf("tessellation level: %d\n", tess_level);
nuclear@1: 			set_uniform_int(prog, "tess_level", tess_level);
nuclear@1: 			glutPostRedisplay();
nuclear@1: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@1: 	case '-':
nuclear@1: 		if(tess_level > 1) {
nuclear@1: 			tess_level--;
nuclear@1: 			printf("tessellation level: %d\n", tess_level);
nuclear@1: 			set_uniform_int(prog, "tess_level", tess_level);
nuclear@1: 			glutPostRedisplay();
nuclear@1: 		}
nuclear@1: 		break;
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static int bnstate[16];
nuclear@0: static int prev_x, prev_y;
nuclear@0: 
nuclear@0: void mouse(int bn, int state, int x, int y)
nuclear@0: {
nuclear@0: 	int idx = bn - GLUT_LEFT_BUTTON;
nuclear@0: 
nuclear@0: 	if(idx < sizeof bnstate / sizeof *bnstate) {
nuclear@0: 		bnstate[idx] = state == GLUT_DOWN;
nuclear@0: 	}
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: }
nuclear@0: 
nuclear@0: void motion(int x, int y)
nuclear@0: {
nuclear@0: 	int dx = x - prev_x;
nuclear@0: 	int dy = y - prev_y;
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: 
nuclear@0: 	if(bnstate[0]) {
nuclear@0: 		cam_theta += dx * 0.5;
nuclear@0: 		cam_phi += dy * 0.5;
nuclear@0: 		if(cam_phi < -90) cam_phi = -90;
nuclear@0: 		if(cam_phi > 90) cam_phi = 90;
nuclear@0: 		glutPostRedisplay();
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(bnstate[2]) {
nuclear@0: 		cam_dist += dy * 0.1;
nuclear@0: 		glutPostRedisplay();
nuclear@0: 	}
nuclear@0: }