зеркало из https://github.com/mozilla/gecko-dev.git
83 строки
3.6 KiB
GLSL
83 строки
3.6 KiB
GLSL
#line 1
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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void main(void) {
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Primitive prim = load_primitive();
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Gradient gradient = fetch_gradient(prim.prim_index);
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vec4 abs_start_end_point = gradient.start_end_point + prim.local_rect.p0.xyxy;
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GradientStop g0 = fetch_gradient_stop(prim.sub_index + 0);
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GradientStop g1 = fetch_gradient_stop(prim.sub_index + 1);
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RectWithSize segment_rect;
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vec2 axis;
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vec4 adjusted_color_g0 = g0.color;
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vec4 adjusted_color_g1 = g1.color;
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if (abs_start_end_point.y == abs_start_end_point.w) {
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// Calculate the x coord of the gradient stops
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vec2 g01_x = mix(abs_start_end_point.xx, abs_start_end_point.zz,
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vec2(g0.offset.x, g1.offset.x));
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// The gradient stops might exceed the geometry rect so clamp them
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vec2 g01_x_clamped = clamp(g01_x,
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prim.local_rect.p0.xx,
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prim.local_rect.p0.xx + prim.local_rect.size.xx);
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// Calculate the segment rect using the clamped coords
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segment_rect.p0 = vec2(g01_x_clamped.x, prim.local_rect.p0.y);
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segment_rect.size = vec2(g01_x_clamped.y - g01_x_clamped.x, prim.local_rect.size.y);
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axis = vec2(1.0, 0.0);
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// Adjust the stop colors by how much they were clamped
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vec2 adjusted_offset = (g01_x_clamped - g01_x.xx) / (g01_x.y - g01_x.x);
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adjusted_color_g0 = mix(g0.color, g1.color, adjusted_offset.x);
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adjusted_color_g1 = mix(g0.color, g1.color, adjusted_offset.y);
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} else {
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// Calculate the y coord of the gradient stops
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vec2 g01_y = mix(abs_start_end_point.yy, abs_start_end_point.ww,
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vec2(g0.offset.x, g1.offset.x));
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// The gradient stops might exceed the geometry rect so clamp them
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vec2 g01_y_clamped = clamp(g01_y,
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prim.local_rect.p0.yy,
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prim.local_rect.p0.yy + prim.local_rect.size.yy);
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// Calculate the segment rect using the clamped coords
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segment_rect.p0 = vec2(prim.local_rect.p0.x, g01_y_clamped.x);
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segment_rect.size = vec2(prim.local_rect.size.x, g01_y_clamped.y - g01_y_clamped.x);
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axis = vec2(0.0, 1.0);
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// Adjust the stop colors by how much they were clamped
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vec2 adjusted_offset = (g01_y_clamped - g01_y.xx) / (g01_y.y - g01_y.x);
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adjusted_color_g0 = mix(g0.color, g1.color, adjusted_offset.x);
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adjusted_color_g1 = mix(g0.color, g1.color, adjusted_offset.y);
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}
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#ifdef WR_FEATURE_TRANSFORM
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TransformVertexInfo vi = write_transform_vertex(segment_rect,
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prim.local_clip_rect,
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prim.z,
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prim.layer,
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prim.task);
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vLocalRect = vi.clipped_local_rect;
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vLocalPos = vi.local_pos;
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vec2 f = (vi.local_pos.xy - prim.local_rect.p0) / prim.local_rect.size;
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#else
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VertexInfo vi = write_vertex(segment_rect,
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prim.local_clip_rect,
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prim.z,
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prim.layer,
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prim.task);
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vec2 f = (vi.local_pos - segment_rect.p0) / segment_rect.size;
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vPos = vi.local_pos;
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#endif
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write_clip(vi.screen_pos, prim.clip_area);
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vColor = mix(adjusted_color_g0, adjusted_color_g1, dot(f, axis));
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}
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