void
tesselate_strip_s_fill(GLint top_start, GLint top_end, GLint top_z,
GLint bottom_start, GLint bottom_end, GLint bottom_z, GLfloat bottom_domain)
{
GLint top_cnt,bottom_cnt,tri_cnt,k;
GLint direction;
top_cnt=top_end-top_start;
direction= (top_cnt>=0 ? 1: -1);
bottom_cnt=bottom_end-bottom_start;
while(top_cnt)
{
if(bottom_cnt)
tri_cnt=top_cnt/bottom_cnt;
else
tri_cnt=abs(top_cnt);
glBegin(GL_TRIANGLE_FAN);
glEvalCoord2f((GLfloat)bottom_start/bottom_domain,
(GLfloat)bottom_z/bottom_domain);
for(k=0;k<=tri_cnt;k++ , top_start+=direction)
glEvalPoint2(top_start,top_z);
if(bottom_cnt)
{
bottom_start+=direction;
top_start-=direction;
glEvalCoord2f((GLfloat)bottom_start/bottom_domain,
(GLfloat)bottom_z/bottom_domain);
}
glEnd();
top_cnt-=direction*tri_cnt;
bottom_cnt-=direction;
}
}
void PainelOpenGL::desenharSuperficieBezier(){
glColor3f(0.0, 0.0, 0.0);
GLfloat ctrlpoints[4][4][3] = {
{{-1.5, -1.5, 4.0}, {-0.5, -1.5, 2.0},
{0.5, -1.5, -1.0}, {1.5, -1.5, 2.0}},
{{-1.5, -0.5, 1.0}, {-0.5, -0.5, 3.0},
{0.5, -0.5, 0.0}, {1.5, -0.5, -1.0}},
{{-1.5, 0.5, 4.0}, {-0.5, 0.5, 0.0},
{0.5, 0.5, 3.0}, {1.5, 0.5, 4.0}},
{{-1.5, 1.5, -2.0}, {-0.5, 1.5, -2.0},
{0.5, 1.5, 0.0}, {1.5, 1.5, -1.0}}
};
glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &ctrlpoints[0][0][0]);
glEnable(GL_MAP2_VERTEX_3);
glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);
for (int j = 0; j <= 8; j++) {
glBegin(GL_LINE_STRIP);
for (int i = 0; i <= 30; i++)
glEvalCoord2f((GLfloat)i/30.0, (GLfloat)j/8.0);
glEnd();
glBegin(GL_LINE_STRIP);
for (int i = 0; i <= 30; i++)
glEvalCoord2f((GLfloat)j/8.0, (GLfloat)i/30.0);
glEnd();
}
}
static void hugsprim_glEvalCoord2f_11(HugsStackPtr hugs_root)
{
HsFloat arg1;
HsFloat arg2;
arg1 = hugs->getFloat();
arg2 = hugs->getFloat();
glEvalCoord2f(arg1, arg2);
hugs->returnIO(hugs_root,0);
}
void display(void)
{
int i, j;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1.0, 1.0, 1.0);
glPushMatrix ();
glRotatef(85.0, 1.0, 1.0, 1.0);
for (j = 0; j <= 8; j++) {
glBegin(GL_LINE_STRIP);
for (i = 0; i <= 30; i++)
glEvalCoord2f((GLfloat)i/30.0, (GLfloat)j/8.0);
glEnd();
glBegin(GL_LINE_STRIP);
for (i = 0; i <= 30; i++)
glEvalCoord2f((GLfloat)j/8.0, (GLfloat)i/30.0);
glEnd();
}
glPopMatrix ();
glFlush();
}
void _mesa_EvalPoint2( GLint i, GLint j )
{
GET_CURRENT_CONTEXT( ctx );
GLfloat du = ((ctx->Eval.MapGrid2u2 - ctx->Eval.MapGrid2u1) /
(GLfloat) ctx->Eval.MapGrid2un);
GLfloat dv = ((ctx->Eval.MapGrid2v2 - ctx->Eval.MapGrid2v1) /
(GLfloat) ctx->Eval.MapGrid2vn);
GLfloat u = i * du + ctx->Eval.MapGrid2u1;
GLfloat v = j * dv + ctx->Eval.MapGrid2v1;
glEvalCoord2f( u, v );
}
void BasicObject::bezierSurface()
{
GLfloat ctrlPts [4][4][3] = {
{ {-1.5, -1.5, 4.0}, {-0.5, -1.5, 2.0}, {-0.5, -1.5, -1.0}, { 1.5, -1.5, 2.0} },
{ {-1.5, -0.5, 1.0}, {-0.5, -0.5, 3.0}, { 0.5, -0.5, 0.0}, { 1.5, -0.5, -1.0} },
{ {-1.5, 0.5, 4.0}, {-0.5, 0.5, 0.0}, { 0.5, 0.5, 3.0}, { 1.5, 0.5, 4.0} },
{ {-1.5, 1.5, -2.0}, {-0.5, 1.5, -2.0}, { 0.5, 1.5, 0.0}, { 1.5, 1.5, -1.0} }
};
glPushMatrix();
glRotatef(35.0, 1.0, 1.0, 1.0);
glTranslatef(0,40,0);
glScalef(10,10,10);
glMap2f (GL_MAP2_VERTEX_3, 0.0, 1.0, 3, 4,
0.0, 1.0, 12, 4, &ctrlPts[0][0][0]);
glEnable (GL_MAP2_VERTEX_3);
GLint k, j;
glColor3f (0.0, 1.0, 1.0);
for (k = 0; k <= 8; k++)
{
glBegin (GL_LINE_STRIP);
for (j = 0; j <= 40; j++)
glEvalCoord2f (GLfloat (j) / 40.0, GLfloat (k) / 8.0);
glEnd ( );
glBegin (GL_LINE_STRIP);
for (j = 0; j <= 40; j++)
glEvalCoord2f (GLfloat (k) / 8.0, GLfloat (j) / 40.0);
glEnd ( );
}
glColor3f (1.0, 0.0, 0.0);
glPointSize (5.0);
glBegin (GL_POINTS);
for (k = 0; k < 4; k++)
for (j = 0; j < 4; j++)
glVertex3fv (&ctrlPts [k][j][0]);
glEnd ();
glPopMatrix();
}
void
tesselate_bottom_left_corner(GLenum display_mode, GLfloat s_1, GLfloat t_1)
{
if(display_mode==GL_FILL)
{
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(1,1);
glEvalCoord2f(s_1,0.0);
glEvalCoord2f(0.0,0.0);
glEvalCoord2f(0.0,t_1);
}
else
{
glBegin(GL_LINES);
glEvalCoord2f(0.0,0.0);
glEvalCoord2f(0.0,t_1);
glEvalCoord2f(0.0,0.0);
glEvalPoint2(1,1);
glEvalCoord2f(0.0,0.0);
glEvalCoord2f(s_1,0.0);
}
glEnd();
}
void
tesselate_top_right_corner(GLenum display_mode, GLint u_left, GLint v_bottom,
GLint u_right, GLint v_top, GLfloat s_1, GLfloat t_1)
{
if(display_mode==GL_FILL)
{
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(u_left,v_bottom);
glEvalCoord2f((u_right-1)*s_1,v_top*t_1);
glEvalCoord2f(u_right*s_1,v_top*t_1);
glEvalCoord2f(u_right*s_1,(v_top-1)*t_1);
}
else
{
glBegin(GL_LINES);
glEvalCoord2f(u_right*s_1,v_top*t_1);
glEvalPoint2(u_left,v_bottom);
glEvalCoord2f(u_right*s_1,v_top*t_1);
glEvalCoord2f(u_right*s_1,(v_top-1)*t_1);
glEvalCoord2f(u_right*s_1,v_top*t_1);
glEvalCoord2f((u_right-1)*s_1,v_top*t_1);
}
glEnd();
}
void
tesselate_top_left_corner(GLenum display_mode, GLint u_right, GLint u_left,
GLfloat s_1, GLfloat t_1)
{
if(display_mode==GL_FILL)
{
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(u_right,1);
glEvalCoord2f((u_left+1)*s_1,t_1);
glEvalCoord2f((u_left+1)*s_1,0.0);
glEvalCoord2f(u_left*s_1,0.0);
}
else
{
glBegin(GL_LINES);
glEvalCoord2f((u_left+1)*s_1,0.0);
glEvalPoint2(u_right,1);
glEvalCoord2f((u_left+1)*s_1,0.0);
glEvalCoord2f(u_left*s_1,0.0);
glEvalCoord2f((u_left+1)*s_1,0.0);
glEvalCoord2f((u_left+1)*s_1,t_1);
}
glEnd();
}
void
tesselate_bottom_right_corner(GLenum display_mode, GLint v_top,GLint v_bottom,
GLfloat s_1, GLfloat t_1)
{
if(display_mode==GL_FILL)
{
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(1,v_top);
glEvalCoord2f(0.0,v_bottom*t_1);
glEvalCoord2f(0.0,(v_bottom+1)*t_1);
glEvalCoord2f(s_1,(v_bottom+1)*t_1);
}
else
{
glBegin(GL_LINES);
glEvalCoord2f(0.0,(v_bottom+1)*t_1);
glEvalPoint2(1,v_top);
glEvalCoord2f(0.0,(v_bottom+1)*t_1);
glEvalCoord2f(0.0,v_bottom*t_1);
glEvalCoord2f(0.0,(v_bottom+1)*t_1);
glEvalCoord2f(s_1,(v_bottom+1)*t_1);
}
glEnd();
}
void glEvalCoord2fv(const GLfloat *v) {
glEvalCoord2f(v[0], v[1]);
}
void glEvalCoord2d(GLdouble u, GLdouble v) {
glEvalCoord2f(u, v);
}
void _mesa_EvalCoord2fv( const GLfloat *u )
{
glEvalCoord2f( u[0], u[1] );
}
M(void, glEvalCoord2f, jfloat u, jfloat v) {
glEvalCoord2f(u, v);
}
