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//[[
//
// applies sub-pixel offset to the viewport texture for smooth camera movement
// while keeping pixel-perfect rendering.
// - game is rendered with camera snapped to integer pixels (pixel-perfect)
// - this shader samples the texture with a UV offset = (smooth_pos - snapped_pos)
// - the offset creates the illusion of smooth camera movement
//
// offset: (subPixelX, subPixelY) in UV space (0-1 range)
// texture must have 1px padding on each side to avoid black bars when sampling.
//]]
extern vec2 offset;
vec4 effect(vec4 color, Image tex, vec2 texture_coords, vec2 screen_coords) {
return Texel(tex, texture_coords + offset);
}
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