зеркало из https://github.com/mozilla/gecko-dev.git
114 строки
4.2 KiB
GLSL
114 строки
4.2 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,prim_shared
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// If this is in WR_FEATURE_TEXTURE_RECT mode, the rect and size use non-normalized
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// texture coordinates. Otherwise, it uses normalized texture coordinates. Please
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// check GL_TEXTURE_RECTANGLE.
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flat varying vec2 vTextureOffset; // Offset of this image into the texture atlas.
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flat varying vec2 vTextureSize; // Size of the image in the texture atlas.
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flat varying vec2 vTileSpacing; // Amount of space between tiled instances of this image.
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flat varying vec4 vStRect; // Rectangle of valid texture rect.
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flat varying float vLayer;
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#ifdef WR_FEATURE_TRANSFORM
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flat varying vec4 vLocalRect;
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#endif
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varying vec2 vLocalPos;
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flat varying vec2 vStretchSize;
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#ifdef WR_VERTEX_SHADER
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void main(void) {
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Primitive prim = load_primitive();
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Image image = fetch_image(prim.specific_prim_address);
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ImageResource res = fetch_image_resource(prim.user_data0);
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#ifdef WR_FEATURE_TRANSFORM
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VertexInfo vi = write_transform_vertex_primitive(prim);
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vLocalPos = vi.local_pos;
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vLocalRect = vec4(prim.local_rect.p0, prim.local_rect.p0 + prim.local_rect.size);
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#else
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VertexInfo vi = write_vertex(prim.local_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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prim.local_rect);
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vLocalPos = vi.local_pos - prim.local_rect.p0;
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#endif
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write_clip(vi.screen_pos, prim.clip_area);
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// If this is in WR_FEATURE_TEXTURE_RECT mode, the rect and size use
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// non-normalized texture coordinates.
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#ifdef WR_FEATURE_TEXTURE_RECT
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vec2 texture_size_normalization_factor = vec2(1, 1);
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#else
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vec2 texture_size_normalization_factor = vec2(textureSize(sColor0, 0));
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#endif
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vec2 uv0, uv1;
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if (image.sub_rect.x < 0.0) {
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uv0 = res.uv_rect.xy;
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uv1 = res.uv_rect.zw;
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} else {
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uv0 = res.uv_rect.xy + image.sub_rect.xy;
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uv1 = res.uv_rect.xy + image.sub_rect.zw;
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}
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// vUv will contain how many times this image has wrapped around the image size.
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vec2 st0 = uv0 / texture_size_normalization_factor;
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vec2 st1 = uv1 / texture_size_normalization_factor;
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vLayer = res.layer;
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vTextureSize = st1 - st0;
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vTextureOffset = st0;
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vTileSpacing = image.stretch_size_and_tile_spacing.zw;
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vStretchSize = image.stretch_size_and_tile_spacing.xy;
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// We clamp the texture coordinates to the half-pixel offset from the borders
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// in order to avoid sampling outside of the texture area.
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vec2 half_texel = vec2(0.5) / texture_size_normalization_factor;
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vStRect = vec4(min(st0, st1) + half_texel, max(st0, st1) - half_texel);
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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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#ifdef WR_FEATURE_TRANSFORM
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float alpha = init_transform_fs(vLocalPos);
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// We clamp the texture coordinate calculation here to the local rectangle boundaries,
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// which makes the edge of the texture stretch instead of repeat.
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vec2 upper_bound_mask = step(vLocalRect.zw, vLocalPos);
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vec2 relative_pos_in_rect = clamp(vLocalPos, vLocalRect.xy, vLocalRect.zw) - vLocalRect.xy;
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#else
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float alpha = 1.0;
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vec2 relative_pos_in_rect = vLocalPos;
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vec2 upper_bound_mask = vec2(0.0);
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#endif
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alpha *= do_clip();
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// We calculate the particular tile this fragment belongs to, taking into
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// account the spacing in between tiles. We only paint if our fragment does
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// not fall into that spacing.
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// If the pixel is at the local rectangle upper bound, we force the current
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// tile upper bound in order to avoid wrapping.
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vec2 position_in_tile = mix(
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mod(relative_pos_in_rect, vStretchSize + vTileSpacing),
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vStretchSize,
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upper_bound_mask);
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vec2 st = vTextureOffset + ((position_in_tile / vStretchSize) * vTextureSize);
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st = clamp(st, vStRect.xy, vStRect.zw);
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alpha = alpha * float(all(bvec2(step(position_in_tile, vStretchSize))));
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oFragColor = vec4(alpha) * TEX_SAMPLE(sColor0, vec3(st, vLayer));
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}
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#endif
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