mirror of
https://git.sr.ht/~eliasnaur/gio
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Viktor
24951a7ee7
Add support for affine transformations. The key changes are outlined below. - Painting/clipping with rectangles is handled by, for complex transforms, creating clipping paths representing the transformed rectangle and using a larger bounding box. Cover/Blit shaders updated correspondingly to correctly map texture cordinates from the new bounding boxes. - Since path splitting must happen on CPU the transforms must happen CPU side as well - offsets removed from shaders. - Complex transforms will lead to different path splitting which means that GPU arrays can no longer be cached if the transform has changed. Thus the current transform is added as a key to the cache. - Add a public API to op for setting Affine transformations. There are a number of optimizations that could be explored further but which are left out now: - Caching also of CPU operations (e.g path splitting & transforms) and not only caching the GPU arrays. - Allow for re-use of cached GPU vertices if the transformation change is a pure offset / scaling since the splitting is then the same. Signed-off-by: Viktor <viktor.ogeman@gmail.com>
30 lines
706 B
GLSL
30 lines
706 B
GLSL
#version 310 es
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// SPDX-License-Identifier: Unlicense OR MIT
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precision highp float;
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#include <common.inc>
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layout(binding = 0) uniform Block {
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vec4 transform;
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vec4 uvCoverTransform;
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vec4 uvTransformR1;
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vec4 uvTransformR2;
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float z;
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};
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layout(location = 0) in vec2 pos;
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layout(location = 0) out vec2 vCoverUV;
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layout(location = 1) in vec2 uv;
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layout(location = 1) out vec2 vUV;
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void main() {
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gl_Position = toClipSpace(vec4(pos*transform.xy + transform.zw, z, 1));
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vUV = transform3x2(m3x2(uvTransformR1.xyz, uvTransformR2.xyz), vec3(uv,1)).xy;
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vec3 uv3 = transform3x2(fboTextureTransform, vec3(uv, 1.0));
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vCoverUV = (uv3*vec3(uvCoverTransform.xy, 1.0)+vec3(uvCoverTransform.zw, 0.0)).xy;
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}
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