68 lines
1.8 KiB
GLSL
68 lines
1.8 KiB
GLSL
/* 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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#include shared,rect,render_task,gpu_cache,gpu_buffer,gradient
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varying highp vec2 v_pos;
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flat varying mediump vec2 v_scale_dir;
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// Start offset. Packed in to a vector to work around bug 1630356.
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flat varying highp vec2 v_start_offset;
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#ifdef WR_VERTEX_SHADER
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#define EXTEND_MODE_REPEAT 1
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PER_INSTANCE in vec4 aTaskRect;
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PER_INSTANCE in vec2 aStartPoint;
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PER_INSTANCE in vec2 aEndPoint;
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PER_INSTANCE in vec2 aScale;
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PER_INSTANCE in int aExtendMode;
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PER_INSTANCE in int aGradientStopsAddress;
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void main(void) {
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vec2 pos = mix(aTaskRect.xy, aTaskRect.zw, aPosition.xy);
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gl_Position = uTransform * vec4(pos, 0.0, 1.0);
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v_pos = aPosition.xy * aScale;
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vec2 dir = aEndPoint - aStartPoint;
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// Normalize UV and offsets to 0..1 scale.
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v_scale_dir = dir / dot(dir, dir);
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v_start_offset.x = dot(aStartPoint, v_scale_dir);
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v_scale_dir *= (aTaskRect.zw - aTaskRect.xy);
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v_gradient_repeat.x = float(aExtendMode == EXTEND_MODE_REPEAT);
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v_gradient_address.x = aGradientStopsAddress;
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}
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#endif
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#ifdef WR_FRAGMENT_SHADER
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void main(void) {
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// Project position onto a direction vector to compute offset.
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float offset = dot(v_pos, v_scale_dir) - v_start_offset.x;
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oFragColor = sample_gradient(offset);
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}
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#ifdef SWGL_DRAW_SPAN
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void swgl_drawSpanRGBA8() {
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int address = swgl_validateGradient(sGpuBufferF, get_gpu_buffer_uv(v_gradient_address.x), int(GRADIENT_ENTRIES + 2.0));
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if (address < 0) {
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return;
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}
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swgl_commitLinearGradientRGBA8(sGpuBufferF, address, GRADIENT_ENTRIES, false, v_gradient_repeat.x != 0.0,
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v_pos, v_scale_dir, v_start_offset.x);
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}
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#endif
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#endif
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