diff options
Diffstat (limited to 'glow/src')
| -rw-r--r-- | glow/src/shader/common/gradient.frag | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/glow/src/shader/common/gradient.frag b/glow/src/shader/common/gradient.frag index 3c701af7..82c7e251 100644 --- a/glow/src/shader/common/gradient.frag +++ b/glow/src/shader/common/gradient.frag @@ -27,27 +27,33 @@ void main() { vec2 current_vec = vec2(raw_position.xy - start); vec2 unit = normalize(gradient_vec); float coord_offset = dot(unit, current_vec) / length(gradient_vec); + //if a gradient has a start/end stop that is identical, the mesh will have a transparent fill + fragColor = vec4(0.0, 0.0, 0.0, 0.0); - for (uint i = 0; i < color_stops_size - 2; i += 2) { - vec4 color = color_stops[i]; - float offset = color_stops[i+1].x; + float min_offset = color_stops[1].x; + float max_offset = color_stops[color_stops_size - 1].x; - vec4 next_color = color_stops[i+2]; + for (uint i = 0; i < color_stops_size - 2; i += 2) { + float curr_offset = color_stops[i+1].x; float next_offset = color_stops[i+3].x; - if (offset <= coord_offset && coord_offset <= next_offset) { - fragColor = mix(color, next_color, smoothstep( - offset, + if (coord_offset <= min_offset) { + //current coordinate is before the first defined offset, set it to the start color + fragColor = color_stops[0]; + } + + if (curr_offset <= coord_offset && coord_offset <= next_offset) { + //current fragment is between the current offset processing & the next one, interpolate colors + fragColor = mix(color_stops[i], color_stops[i+2], smoothstep( + curr_offset, next_offset, coord_offset )); - } else if (coord_offset < color_stops[1].x) { - fragColor = color_stops[0]; - } else if (coord_offset > color_stops[color_stops_size - 1].x) { + } + + if (coord_offset >= max_offset) { + //current coordinate is before the last defined offset, set it to the last color fragColor = color_stops[color_stops_size - 2]; - } else { - //This use case can happen if a gradient's start & end position are the same - fragColor = vec4(0.0, 0.0, 0.0, 0.0); } } } |