diff options
Diffstat (limited to 'src/quickshapes/shaders_ng/conicalgradient.frag')
-rw-r--r-- | src/quickshapes/shaders_ng/conicalgradient.frag | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/quickshapes/shaders_ng/conicalgradient.frag b/src/quickshapes/shaders_ng/conicalgradient.frag new file mode 100644 index 0000000000..0b1e01bae2 --- /dev/null +++ b/src/quickshapes/shaders_ng/conicalgradient.frag @@ -0,0 +1,25 @@ +#version 440 + +layout(location = 0) in vec2 coord; +layout(location = 0) out vec4 fragColor; + +layout(binding = 1) uniform sampler2D gradTabTexture; + +layout(std140, binding = 0) uniform buf { + mat4 matrix; + vec2 translationPoint; + float angle; + float opacity; +} ubuf; + +#define INVERSE_2PI 0.1591549430918953358 + +void main() +{ + float t; + if (abs(coord.y) == abs(coord.x)) + t = (atan(-coord.y + 0.002, coord.x) + ubuf.angle) * INVERSE_2PI; + else + t = (atan(-coord.y, coord.x) + ubuf.angle) * INVERSE_2PI; + fragColor = texture(gradTabTexture, vec2(t - floor(t), 0.5)) * ubuf.opacity; +} |