diff options
Diffstat (limited to 'src/imports/shapes/shaders/radialgradient_core.frag')
-rw-r--r-- | src/imports/shapes/shaders/radialgradient_core.frag | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/imports/shapes/shaders/radialgradient_core.frag b/src/imports/shapes/shaders/radialgradient_core.frag new file mode 100644 index 0000000000..706ce53e4d --- /dev/null +++ b/src/imports/shapes/shaders/radialgradient_core.frag @@ -0,0 +1,29 @@ +#version 150 core + +uniform sampler2D gradTabTexture; +uniform float opacity; + +uniform vec2 focalToCenter; +uniform float centerRadius; +uniform float focalRadius; + +in vec2 coord; + +out vec4 fragColor; + +void main() +{ + float rd = centerRadius - focalRadius; + float b = 2.0 * (rd * focalRadius + dot(coord, focalToCenter)); + float fmp2_m_radius2 = -focalToCenter.x * focalToCenter.x - focalToCenter.y * focalToCenter.y + rd * rd; + float inverse_2_fmp2_m_radius2 = 1.0 / (2.0 * fmp2_m_radius2); + float det = b * b - 4.0 * fmp2_m_radius2 * ((focalRadius * focalRadius) - dot(coord, coord)); + vec4 result = vec4(0.0); + if (det >= 0.0) { + float detSqrt = sqrt(det); + float w = max((-b - detSqrt) * inverse_2_fmp2_m_radius2, (-b + detSqrt) * inverse_2_fmp2_m_radius2); + if (focalRadius + w * (centerRadius - focalRadius) >= 0.0) + result = texture(gradTabTexture, vec2(w, 0.5)) * opacity; + } + fragColor = result; +} |