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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#define VECS_PER_SPECIFIC_BRUSH 2
#include shared,prim_shared,brush,gradient_shared
flat varying vec2 v_start_point;
flat varying vec2 v_scale_dir;
#ifdef WR_VERTEX_SHADER
struct Gradient {
vec4 start_end_point;
int extend_mode;
vec2 stretch_size;
};
Gradient fetch_gradient(int address) {
vec4 data[2] = fetch_from_gpu_cache_2(address);
return Gradient(
data[0],
int(data[1].x),
data[1].yz
);
}
void brush_vs(
VertexInfo vi,
int prim_address,
RectWithSize local_rect,
RectWithSize segment_rect,
ivec4 prim_user_data,
int specific_resource_address,
mat4 transform,
PictureTask pic_task,
int brush_flags,
vec4 texel_rect
) {
Gradient gradient = fetch_gradient(prim_address);
write_gradient_vertex(
vi,
local_rect,
segment_rect,
prim_user_data,
brush_flags,
texel_rect,
gradient.extend_mode,
gradient.stretch_size
);
vec2 start_point = gradient.start_end_point.xy;
vec2 end_point = gradient.start_end_point.zw;
vec2 dir = end_point - start_point;
v_start_point = start_point;
v_scale_dir = dir / dot(dir, dir);
// Normalize UV and offsets to 0..1 scale.
v_start_point /= v_repeated_size;
v_scale_dir *= v_repeated_size;
}
#endif
#ifdef WR_FRAGMENT_SHADER
Fragment brush_fs() {
vec2 pos = compute_gradient_pos();
float offset = dot(pos - v_start_point, v_scale_dir);
vec4 color = sample_gradient(offset);
#ifdef WR_FEATURE_ALPHA_PASS
color *= init_transform_fs(v_local_pos);
#endif
return Fragment(color);
}
#endif
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