void render(const example_state_view& state)
override
{
rad += radians_(0.5f*state.frame_duration().value());
current_buf = (current_buf+1)%2;
gl.uniform(
prog.light_pos,
vec3(cos(rad)*4, sin(rad)*4, 8)
);
gl.uniform(
prog.modelview,
matrix_rotation_x(rad*1)*
matrix_rotation_y(rad*2)*
matrix_rotation_z(rad*3)
);
// draw into the texture
gl.bind(GL.draw_framebuffer, rnd_tex.fbos[current_buf]);
gl.viewport(tex_side, tex_side);
GLfloat s = 0.5f;
gl.uniform(
prog.projection,
oglplus::matrix_perspective(-s,+s, -s,+s, 1.0f, 5)*
oglplus::matrix_translation(0,0,-2)
);
gl.clear(GL.color_buffer_bit|GL.depth_buffer_bit);
gl.draw_arrays(GL.triangles, 0, 6 * 2 * 3);
// draw on screen
gl.bind(GL.draw_framebuffer, default_framebuffer);
gl.viewport(state.width(), state.height());
gl.uniform(prog.cube_tex, GLint(current_buf));
GLfloat h = 0.55f;
GLfloat w = h*state.aspect();
gl.uniform(
prog.projection,
oglplus::matrix_perspective(-w,+w, -h,+h, 1, 3)*
oglplus::matrix_translation(0,0,-2)
);
gl.clear(GL.color_buffer_bit|GL.depth_buffer_bit);
gl.draw_arrays(GL.triangles, 0, 6 * 2 * 3);
}
void render(const example_state_view& /*state*/)
override
{
gl.draw_arrays(GL.triangle_strip, 0, 4);
}