diff options
Diffstat (limited to 'gsk/gl/resources/unblurred_outset_shadow.glsl')
-rw-r--r-- | gsk/gl/resources/unblurred_outset_shadow.glsl | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/gsk/gl/resources/unblurred_outset_shadow.glsl b/gsk/gl/resources/unblurred_outset_shadow.glsl new file mode 100644 index 0000000000..f110370412 --- /dev/null +++ b/gsk/gl/resources/unblurred_outset_shadow.glsl @@ -0,0 +1,42 @@ +// VERTEX_SHADER: +uniform vec4 u_color; +uniform float u_spread; +uniform vec2 u_offset; +uniform vec4[3] u_outline_rect; + +_OUT_ vec4 final_color; +_OUT_ _GSK_ROUNDED_RECT_UNIFORM_ transformed_outside_outline; +_OUT_ _GSK_ROUNDED_RECT_UNIFORM_ transformed_inside_outline; + +void main() { + gl_Position = u_projection * u_modelview * vec4(aPosition, 0.0, 1.0); + + final_color = gsk_premultiply(u_color) * u_alpha; + + GskRoundedRect inside = gsk_create_rect(u_outline_rect); + GskRoundedRect outside = gsk_rounded_rect_shrink(inside, vec4(- u_spread)); + + gsk_rounded_rect_offset(outside, u_offset); + + gsk_rounded_rect_transform(outside, u_modelview); + gsk_rounded_rect_transform(inside, u_modelview); + + gsk_rounded_rect_encode(outside, transformed_outside_outline); + gsk_rounded_rect_encode(inside, transformed_inside_outline); +} + +// FRAGMENT_SHADER: +_IN_ vec4 final_color; +_IN_ _GSK_ROUNDED_RECT_UNIFORM_ transformed_outside_outline; +_IN_ _GSK_ROUNDED_RECT_UNIFORM_ transformed_inside_outline; + +void main() { + vec2 frag = gsk_get_frag_coord(); + + float alpha = clamp(gsk_rounded_rect_coverage(gsk_decode_rect(transformed_outside_outline), frag) - + gsk_rounded_rect_coverage(gsk_decode_rect(transformed_inside_outline), frag), + 0.0, 1.0); + + gskSetOutputColor(final_color * alpha); +} + |