2018-12-15 00:09:37 +03:00
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/*
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* Copyright 2018 Attila Kocsis. All rights reserved.
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2022-01-15 22:59:06 +03:00
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
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2018-12-15 00:09:37 +03:00
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*/
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#include "bgfx_compute.sh"
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#include "uniforms.sh"
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IMAGE2D_ARRAY_WR(s_target, rg8, 0);
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SAMPLER2DARRAY(s_blurInput, 1);
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// edge-ignorant blur in x and y directions, 9 pixels touched (for the lowest quality level 0)
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NUM_THREADS(8, 8, 1)
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void main()
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{
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uvec2 dtID = uvec2(gl_GlobalInvocationID.xy) + uvec2(u_rect.xy);
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if (all(lessThan(dtID.xy, u_rect.zw) ) )
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{
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vec2 inUV = (dtID.xy+vec2(0.5,0.5)) * u_halfViewportPixelSize;
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vec2 halfPixel = u_halfViewportPixelSize * 0.5f;
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#if BGFX_SHADER_LANGUAGE_GLSL
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halfPixel.y = -halfPixel.y;
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#endif
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vec2 centre = texture2DArrayLod(s_blurInput, vec3(inUV, 0.0), 0.0 ).xy;
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vec4 vals;
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vals.x = texture2DArrayLod(s_blurInput, vec3(inUV + vec2( -halfPixel.x * 3, -halfPixel.y ),0.0) , 0.0 ).x;
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vals.y = texture2DArrayLod(s_blurInput, vec3(inUV + vec2( +halfPixel.x, -halfPixel.y * 3 ),0.0) , 0.0 ).x;
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vals.z = texture2DArrayLod(s_blurInput, vec3(inUV + vec2( -halfPixel.x, +halfPixel.y * 3 ),0.0) , 0.0 ).x;
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vals.w = texture2DArrayLod(s_blurInput, vec3(inUV + vec2( +halfPixel.x * 3, +halfPixel.y ),0.0) , 0.0 ).x;
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imageStore(s_target, ivec3(dtID.xy,u_layer), vec4(dot( vals, 0.2.xxxx ) + centre.x * 0.2, centre.y, 0.0, 0.0));
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}
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}
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