diff options
Diffstat (limited to 'render/fx_renderer/gles2/shaders/quad_grad.frag')
| -rw-r--r-- | render/fx_renderer/gles2/shaders/quad_grad.frag | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/render/fx_renderer/gles2/shaders/quad_grad.frag b/render/fx_renderer/gles2/shaders/quad_grad.frag index a73975b..6f611ca 100644 --- a/render/fx_renderer/gles2/shaders/quad_grad.frag +++ b/render/fx_renderer/gles2/shaders/quad_grad.frag @@ -25,11 +25,12 @@ vec4 gradient(){ float rad = radians(degree); if(linear){ - float angle = rad + atan(uv.x, uv.y); + uv *= vec2(1.0)/vec2(abs(cos(rad)) + abs(sin(rad))); - float len = length(uv); - uv = vec2(cos(angle) * len, sin(angle) * len) + origin; - step = uv.x; + vec2 rotated = vec2(uv.x * cos(rad) - uv.y * sin(rad) + origin.x, + uv.x * sin(rad) + uv.y * cos(rad) + origin.y); + + step = rotated.x; } else { vec2 uv = normal - origin; uv = vec2(uv.x * cos(rad) - uv.y * sin(rad), |