void VideoEngine::DrawGrid(float x, float y, float x_step, float y_step, const Color &c)
{
PushState();
Move(0, 0);
float x_max = _current_context.coordinate_system.GetRight();
float y_max = _current_context.coordinate_system.GetBottom();
std::vector<GLfloat> vertices;
int32 num_vertices = 0;
for(; x <= x_max; x += x_step) {
vertices.push_back(x);
vertices.push_back(_current_context.coordinate_system.GetBottom());
vertices.push_back(x);
vertices.push_back(_current_context.coordinate_system.GetTop());
num_vertices += 2;
}
for(; y < y_max; y += y_step) {
vertices.push_back(_current_context.coordinate_system.GetLeft());
vertices.push_back(y);
vertices.push_back(_current_context.coordinate_system.GetRight());
vertices.push_back(y);
num_vertices += 2;
}
glColor4fv(&c[0]);
DisableTexture2D();
EnableVertexArray();
glVertexPointer(2, GL_FLOAT, 0, &(vertices[0]));
glDrawArrays(GL_LINES, 0, num_vertices);
PopState();
}
void VideoEngine::DrawLine(float x1, float y1, float x2, float y2, float width, const Color& color)
{
GLfloat vert_coords[] = {
x1, y1,
x2, y2
};
EnableBlending();
DisableTexture2D();
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // Normal blending
glPushAttrib(GL_LINE_WIDTH);
glLineWidth(width);
EnableVertexArray();
DisableColorArray();
DisableTextureCoordArray();
glColor4fv((GLfloat *)color.GetColors());
glVertexPointer(2, GL_FLOAT, 0, vert_coords);
glDrawArrays(GL_LINES, 0, 2);
glPopAttrib(); // GL_LINE_WIDTH
}
