static bool
test_line(const struct stipple_line *line)
{
GLuint i;
glLineStipple(line->factor, line->pattern);
glColor3f(line->color[0], line->color[1], line->color[2]);
glBegin(line->primitive);
for (i = 0; i < line->nvertices; ++i)
glVertex2f(line->vertices[i].x + 0.5, line->vertices[i].y + 0.5);
glEnd();
glReadBuffer(GL_BACK);
if (line->primitive == GL_LINES) {
for (i = 0; i + 1 < line->nvertices; i += 2) {
GLuint fragment = 0;
if (!probe_line(line, i, i + 1, &fragment))
return false;
}
} else {
GLuint fragment = 0;
for (i = 0; i + 1 < line->nvertices; ++i) {
if (!probe_line(line, i, i + 1, &fragment))
return false;
}
if (line->primitive == GL_LINE_LOOP) {
if (!probe_line(line, i, 0, &fragment))
return false;
}
}
return true;
}
static void test_line(const struct stipple_line *line)
{
GLuint i;
glLineStipple(line->factor, line->pattern);
glColor3f(line->color[0], line->color[1], line->color[2]);
glBegin(line->primitive);
for(i = 0; i < line->nvertices; ++i)
glVertex2f(line->vertices[i].x + 0.5, line->vertices[i].y + 0.5);
glEnd();
glReadBuffer(GL_BACK);
if (line->primitive == GL_LINES) {
for(i = 0; i+1 < line->nvertices; i += 2)
probe_line(line, &line->vertices[i], &line->vertices[i+1], 0);
} else {
GLuint fragment = 0;
for(i = 0; i+1 < line->nvertices; ++i)
fragment = probe_line(line, &line->vertices[i], &line->vertices[i+1], fragment);
if (line->primitive == GL_LINE_LOOP)
probe_line(line, &line->vertices[i], &line->vertices[0], fragment);
}
}
