From 0e4a97e5a67d886e64c0d5337b281dc2c68332cf Mon Sep 17 00:00:00 2001 From: ame Date: Mon, 14 Oct 2024 03:41:40 -0500 Subject: fix linear scaling --- render/fx_renderer/gles2/shaders/quad_grad.frag | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'render/fx_renderer/gles2/shaders/quad_grad.frag') 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), -- cgit v1.2.3