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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,gpu_buffer,gradient_shared
// Start offset. Packed in to vector to work around bug 1630356.
flat varying mediump vec2 v_start_offset;
flat varying mediump 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,
RectWithEndpoint local_rect,
RectWithEndpoint 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;
// Normalize UV and offsets to 0..1 scale.
v_scale_dir = dir / dot(dir, dir);
v_start_offset.x = dot(start_point, v_scale_dir);
v_scale_dir *= v_repeated_size;
}
#endif
#ifdef WR_FRAGMENT_SHADER
float get_gradient_offset(vec2 pos) {
// Project position onto a direction vector to compute offset.
return dot(pos, v_scale_dir) - v_start_offset.x;
}
Fragment brush_fs() {
vec4 color = sample_gradient(get_gradient_offset(compute_repeated_pos()));
#ifdef WR_FEATURE_ALPHA_PASS
color *= antialias_brush();
#endif
return Fragment(color);
}
#ifdef SWGL_DRAW_SPAN
void swgl_drawSpanRGBA8() {
int address = swgl_validateGradient(sGpuBuffer, get_gpu_buffer_uv(v_gradient_address.x), int(GRADIENT_ENTRIES + 2.0));
if (address < 0) {
return;
}
swgl_commitLinearGradientRGBA8(sGpuBuffer, address, GRADIENT_ENTRIES, true, v_gradient_repeat.x != 0.0,
v_pos, v_scale_dir, v_start_offset.x);
}
#endif
#endif
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