layout (location = 0) in vec2 a_pos;
out vec2 v_pos;

layout (std140) uniform GlobalPaintParamsUBO {
    highp vec2 u_pattern_atlas_texsize;
    highp vec2 u_units_to_pixels;
    highp vec2 u_world_size;
    highp float u_camera_to_center_distance;
    highp float u_symbol_fade_change;
    highp float u_aspect_ratio;
    highp float u_pixel_ratio;
    highp float u_map_zoom;
    lowp float global_pad1;
};

layout (std140) uniform HeatmapTexturePropsUBO {
    highp mat4 u_matrix;
    highp float u_opacity;
    lowp float props_pad1;
    lowp float props_pad2;
    lowp float props_pad3;
};

void main() {
    gl_Position = u_matrix * vec4(a_pos * u_world_size, 0, 1);

    v_pos.x = a_pos.x;
    v_pos.y = 1.0 - a_pos.y;
}