forked from AuroraMiddleware/gtk
58 lines
1.5 KiB
GLSL
58 lines
1.5 KiB
GLSL
#ifndef GSK_LEGACY
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precision highp float;
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#endif
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#if defined(GSK_GLES) || defined(GSK_LEGACY)
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#define _OUT_ varying
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#define _IN_ varying
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#define _NOPERSPECTIVE_
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#define _GSK_ROUNDED_RECT_UNIFORM_ vec4[3]
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#else
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#define _OUT_ out
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#define _IN_ in
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#define _NOPERSPECTIVE_ noperspective
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#define _GSK_ROUNDED_RECT_UNIFORM_ GskRoundedRect
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#endif
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struct GskRoundedRect
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{
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vec4 bounds; // Top left and bottom right
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// Look, arrays can't be in structs if you want to return the struct
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// from a function in gles or whatever. Just kill me.
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vec4 corner_points1; // xy = top left, zw = top right
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vec4 corner_points2; // xy = bottom right, zw = bottom left
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};
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// Transform from a C GskRoundedRect to what we need.
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GskRoundedRect
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gsk_create_rect(vec4[3] data)
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{
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vec4 bounds = vec4(data[0].xy, data[0].xy + data[0].zw);
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vec4 corner_points1 = vec4(bounds.xy + data[1].xy,
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bounds.zy + vec2(data[1].zw * vec2(-1, 1)));
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vec4 corner_points2 = vec4(bounds.zw + (data[2].xy * vec2(-1, -1)),
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bounds.xw + vec2(data[2].zw * vec2(1, -1)));
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return GskRoundedRect(bounds, corner_points1, corner_points2);
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}
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vec4
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gsk_get_bounds(vec4[3] data)
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{
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return vec4(data[0].xy, data[0].xy + data[0].zw);
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}
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vec4 gsk_premultiply(vec4 c) {
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return vec4(c.rgb * c.a, c.a);
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}
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vec4 gsk_scaled_premultiply(vec4 c, float s) {
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// Fast version of gsk_premultiply(c) * s
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// 4 muls instead of 7
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float a = s * c.a;
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return vec4(c.rgb * a, a);
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}
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